PRODUCTS

SODIUM ALUMINATE

SODIUM ALUMINATE
Sodium aluminate is a reagent useful for isomerization of alkenes and amines. Sodium aluminate is a form of high surface area sodium metal with cation traces: Al (Al2O3): 50-56% and Na (as Na2O): 37-45%.
Sodium aluminate is an important commercial papermaking additive about 20 to 30 years ago. Sodium aluminate has many uses, such as helping to keep fine fibers and fillers, stabilizing buffering capacity in water treatment, and adjusting the pH of the water circulation system.
Appearance: Powder
Physical State: Solid
Melting Point: 1650°C
Density: 2.60 g/cm3 at 20°C
Application: Sodium aluminate is an inorganic reagent useful as a catalyst for the isomerization of alkenes and amines.
CAS Number: 11138-49-1
EC Number: 215-100-1

Sodium Aluminate:
Sodium Aluminate is generally immediately available in most volumes. Aluminates are compounds with a negatively-charged alumina ion and a metallic oxide with various industrial applications such as water treatment and ceramics manufacturing. In December 2012, a team of researchers created a unique type of highly-reflective pigment composed of rare earth-doped cobalt aluminate that may have potential use as an energy-efficient exterior coating. High purity, submicron and nanopowder forms may be considered.
Sodium aluminate is a product obtained from the dissolution of aluminium hydroxide (gibbsite) in sodium hydroxide. IQE produces sodium aluminates in solution, in the form of a transparent liquid.

Sodium aluminate is an excellent source of reactive alumina in alkaline solution and this is the main reason for its use as a raw material in many industrial processes.
It is used in waste water treatment, it is a shotcrete set accelerator; it is also used in the paper industry as an auxiliary refining agent and retaining agent, and other uses are described as a raw material in catalytical supports, zeolites, etc

Definition: Sodium aluminate: white solid,NaAlO2 or Na2Al2O4, which is insolublein ethanol and soluble inwater giving strongly alkaline solutions;m.p. 1800°C. It is manufacturedby heating bauxite withsodium carbonate and extractingthe residue with water, or it may beprepared in the laboratory by addingexcess aluminium to hot concentratedsodium hydroxide. In solutionthe ion Al(OH)4- predominates.Sodium aluminate is used as amordant, in the production of zeolites,in effluent treatment, in glass manufacture, and in cleansing compounds.

Sodium aluminate is an inorganic chemical that is used as an effective source of aluminium hydroxide for many industrial and technical applications. Pure sodium aluminate (anhydrous) is a white crystalline solid having a formula variously given as NaAlO2, NaAl(OH)4 (hydrated), Na2O·Al2O3, or Na2Al2O4. Commercial sodium aluminate is available as a solution or a solid.
Structure:
Anhydrous sodium aluminate, NaAlO2, contains a three-dimensional framework of corner linked AlO4 tetrahedra. The hydrated form NaAlO2·5/4H2O has layers of AlO4 tetrahedra joined into rings and the layers are held together by sodium ions and water molecules that hydrogen bond to O atoms in the AlO4 tetrahedra.

Sodium aluminate is becoming an increasingly popular choice for the removal of phosphates, magnesium, silicates, suspended solids (SS) etc. in municipal and industrial wastewater treatment plants as nitrogen and phosphate discharge limits become more and more stringent. Its use also improves water clarification by reducing corrosion, foaming and the amount of sludge generated. As a physico-chemical process with biological treatment or with the use of catalytic wet oxidation processes combined with the use of UV rays, the use of sodium aluminate creates real advantages.

This type of aluminium-based coagulant improves flocculation but is also used in other sectors:
•   In construction, as a concrete setting accelerator and as a hardening agent, especially when work is carried out in winter or during periods of frost
•   In the paper industry to increase the pH level
•   In the titanium dioxide industry for surface treatment, as intermediates
•   For the manufacture of zeolites and catalysts
•   For the manufacture of refractory cements
Applications:
•   Treatment of drinking water
o   Coagulation & flocculation
•   Municipal or industrial wastewater treatment
o   Coagulation & flocculation
o   Phosphate removal & clarification
•   Paper industry: neutralisation & flocculation, bonding, retention agent and pH adjustment agent
•   Construction: accelerator and additive for concretes and cements/hardening agent
•   Pigments: surface treatment for the titanium dioxide industry
•   Pharmacy: formulation
•   Catalysts: alumina manufacture

Manufacturing:
Sodium aluminate is manufactured by the dissolution of aluminium hydroxide (Al(OH)3) in a caustic soda (NaOH) solution. Aluminium hydroxide (gibbsite) can be dissolved in 20–25% aqueous NaOH solution at a temperature near the boiling point.

The use of more concentrated NaOH solutions leads to a semi-solid product. The process must be carried out in steam-heated vessels of nickel or steel, and the aluminium hydroxide should be boiled with approximately 50% aqueous caustic soda until a pulp forms. The final mixture has to be poured into a tank and cooled; a solid mass containing about 70% NaAlO2 then forms. After being crushed, this product is dehydrated in a rotary oven.

The resulting product contains 90% NaAlO2 and 1% water, together with 1% free NaOH.
Reaction of Aluminium Metal and Alkali:
Sodium aluminate is also formed by the action of sodium hydroxide on elemental aluminium which is an amphoteric metal. The reaction is highly exothermic once established and is accompanied by the rapid evolution of hydrogen gas. The reaction is sometimes written as:
2Al + 2NaOH + 2H2O → 2NaAlO2 + 3H2
However, the species produced in solution is likely to contain the [Al(OH)4]− ion or perhaps the [Al(H2O)2(OH)4]− ion.
Uses:
In water treatment it is used as an adjunct to water softening systems, as a coagulant aid to improve flocculation, and for removing dissolved silica and phosphates.
In construction technology, sodium aluminate is employed to accelerate the solidification of concrete, mainly when working during frost.
Sodium aluminate is also used in the paper industry, for fire brick production, alumina production and so forth.

Sodium aluminate solutions are intermediates in the production of zeolites.
Sodium aluminate is an inorganic chemical that is used as an effective source of aluminium hydroxide for many industrial and technical applications. Pure sodium aluminate (anhydrous) is a white crystalline solid having a formula variously given as NaAlO2, NaAl(OH)4 (hydrated),[2] Na2O·Al2O3, or Na2Al2O4.

Sodium aluminate is manufactured by the dissolution of aluminium hydroxide (Al(OH)3) in a caustic soda (NaOH) solution. Aluminium hydroxide (gibbsite) can be dissolved in 20–25% aqueous NaOH solution at a temperature near the boiling point. The use of more concentrated NaOH solutions leads to a semi-solid product.

The process must be carried out in steam-heated vessels of nickel or steel, and the aluminium hydroxide should be boiled with approximately 50% aqueous caustic soda until a pulp forms.
The final mixture has to be poured into a tank and cooled; a solid mass containing about 70% NaAlO2 then forms. After being crushed, this product is dehydrated in a rotary oven.

The resulting product contains 90% NaAlO2 and 1% water, together with 1% free NaOH. Sodium aluminate was introduced to the paper industry over 40 years ago. Its acceptance as an excellent wet end additive grew extensively in Europe and the U.S. paper making operations. Sodium aluminate was found to be very effective when used in conjunction with other cationic sources, such as alum, to optimize and improve wet end paper machine operations.Simply stated, sodium aluminate is an alkaline form of aluminum which has been dissolved in caustic.

Aluminum, because of its amphoteric nature, can be easily dissolved either in an acid or alkaline medium. Aluminum dissolved in sulfuric acid forms aluminum sulfate, or alum, and aluminum dissolved in caustic forms sodium aluminate.
Sodium aluminate possesses an anionically charged alumina particle. Sodium aluminate performs two basic functions in the paper maker process. One of these is primarily a chemical function which is to furnish a portion of the alumina required for sizing. Second function is best considered a physical function of coagulation and retention. System conditions created by these two reactions and the reaction products are the basis for the benefits provided by sodium aluminate.

Other benefits from sodium aluminate usage are: Improved strength and durability, Cleaner machine system, Reduced foam,Reduced corrosion. While SODIUM ALUMINATE is also used as a raw material in industrial production processes and by the construction sector, its primary use is in industrial wastewater treatment facilities and, above all, in sewage treatment plants. The product’s properties offer two clear advantages here.

Thanks to its high pH value, SODIUM ALUMINATE helps prevent the formation of filamentous bacteria and so increases the overall efficiency and functionality of sewage treatment plants. What’s more, Sodium aluminate acts as a precipitating agent and eliminates the phosphate in the water. This is important as high amounts of phosphate – which, in itself, is actually essential to life – can have a hugely negative impact on the environment. High levels of the nutrient, phosphorus, in rivers and lakes, for example, can result in a rapid growth of algae and water plants which, in turn, disrupts the ecosystem.

SODIUM ALUMINATE State-of-the-Art Water Purification SolutionAll Sodium Aluminate solutions are produced according to EN 882 (Chemicals used for the treatment of water intended for human consumption). Aluminum products reduce chemical sludge production compared to iron, due to the low molecular weight of AI. Aluminates raise the alkalinity of the water, eliminating the need for lime or hydroxides.SODIUM ALUMINATE is produced by reacting alumina hydroxide with sodium hydroxide.

Sodium Aluminate is most widely used in municipal drinking water and waste water treatment systems. As an alkali, Sodium Aluminate can work in applications where the addition of caustic is not desirable. Sodıum Alüminate provides an economical source of highly reactive alumina.Sodium aluminate is becoming an increasingly popular choice for the removal of phosphorus in municipal and industrial wastewater plants. As discharge limits for nitrogen and phosphorus become more stringent, many plants are implementing both biological and chemical treatment systems for their reduction. However, both these treatment processes can deplete the available alkalinity and depress effluent pH below discharge limits.

Sodium Aluminate is increasingly being used for drinking water and wastewater treatment. As an alkaline coagulant, sodium aluminate can be used for applications where the addition of caustic soda alone is not desirable. Sodium aluminate solution provides an economical source of highly reactive alumina. Sodium Aluminate is becoming an increasingly popular choice for the removal of phosphates, magnesium, silicates, suspended solids (SS) etc. in municipal and industrial wastewater treatment plants as nitrogen and phosphate discharge limits become more and more stringent.

Its use also improves water clarification by reducing corrosion, foaming and the amount of sludge generated. As a physico-chemical process with biological treatment or with the use of catalytic wet oxidation processes combined with the use of UV rays, the use of sodium aluminate creates real advantages. Sodium aluminate is commonly used in waste water treatment plants to remove suspended solids, some metals and dissolved silica.

In construction, sodium aluminate is used during cold weather to accelerate the solidification of concrete. Other areas where sodium aluminate is used include paper production, refractory bricks and alumina production.Sodium aluminate is commonly used to ensure the stable treatment of water with a low pH, in paper, cardboard and plastics industries,as well as industrial and municipal wastewater.
Sodium Aluminate solution is widely used in the water and wastewater treatment markets.

As an aluminum based coagulant manufactured as an alkaline ( caustic) based solution, Sodium Aluminate offers advantages in systems where maintaining pH at a higher level is important. Unlike acid based metal salt coagulants, Sodium Aluminate will not reduce system alkalinity. Sodıum Alüminate is used as a water treatment chemical for removing phosphates and fluorides from municipal and industrial waters and also for lime softening aid in process and groundwater treatment applications.

The SODIUM ALUMINATE is a very strong alkaline agent, therefore is very good coagulant in water treatment applications. Sodium aluminate may be used alone or in combination with Ferric Sulfate and or with Aluminum Sulfate. When solids content in the water is very high,the SODIUM ALUMINATE may be added using Calcium Hydroxide. Sodium aluminate is an inorganic chemical substance. The formula of the chemical component is NaAIO2.

Overview The powder is white in color. Sodium aluminate, an odorless structure, is also known as aluminum. Sodium aluminate provides solution of caustic soda with aluminum hydroxide and boiling of this solution. Sodium aluminate is an inorganic chemical that is used as an effective source of aluminium hydroxide for many industrial and technical applications. Pure sodium aluminate (anhydrous) is a white crystalline solid having a formula variously given as NaAlO2, NaAl(OH)4 (hydrated),[2] Na2O·Al2O3, or Na2Al2O4. Commercial sodium aluminate is available as a solution or a solid.

related compounds, sometimes called sodium aluminate, prepared by reaction of Na2O and Al2O3 are Na5AlO4 which contains discrete AlO45- anions, Na7Al3O8 and Na17Al5O16 which contain complex polymeric anions, and NaAl11O17, once mistakenly believed to be β-alumina, a phase of aluminium oxide. Sodium Aluminate is generally immediately available in most volumes. Aluminates are compounds with a negatively-charged alumina ion and a metallic oxide with various industrial applications such as water treatment and ceramics manufacturing.

In December 2012, a team of researchers created a unique type of highly-reflective pigment composed of rare earth-doped cobalt aluminate that may have potential use as an energy-efficient exterior coating.
High purity, submicron and nanopowder forms may be considered. American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia)and follows applicable ASTM testing standards. Typical and custom packaging is available. Additional technical, research and safety (MSDS) information is available as is a Reference Calculator for converting relevant units of measurement. Sodium Aluminate is most widely used in municipal drinking water and waste water treatment systems.

As an alkali, Sodium Aluminate can work in applications where the addition of caustic is not desirable. Sodıum Alüminate provides an economical source of highly reactive alumina. Liquid sodium aluminate (LSA) is becoming an increasingly popular choice for the removal of phosphorus in municipal and industrial wastewater plants.
As discharge limits for nitrogen and phosphorus become more stringent, many plants are implementing both biological and chemical treatment systems for their reduction. However, both these treatment processes can deplete the available alkalinity and depress effluent pH below discharge limits.

Anhydrous sodium aluminate, NaAlO2, contains a three-dimensional framework of corner linked AlO4 tetrahedra. The hydrated form NaAlO2·5/4H2O has layers of AlO4 tetrahedra joined into rings and the layers are held together by sodium ions and water molecules that hydrogen bond to O atoms in the AlO4 tetrahedra. Sodium aluminate is manufactured by the dissolution of- aluminium hydroxide in a caustic soda (NaOH) solution. Aluminium hydroxide (gibbsite) can be dissolved in 20-25% aqueous NaOH solution at a temperature near the boiling point. The use of more concentrated NaOH solutions leads to a semi-solid product.

The process must be carried out in steam-heated vessels of nickel or steel, and the aluminium hydroxide should be boiled with approximately 50% aqueous caustic soda until a pulp forms. The final mixture has to be poured into a tank and cooled; a solid mass containing about 70% NaAlO2 then forms. After being crushed, this product is dehydrated in a rotary oven. The resulting product contains 90% NaAlO2 and 1% water, together with 1% free NaOH.

In water treatment Sodium aluminate is used as an adjunct to water softening systems, as a coagulant aid to improve flocculation, and for removing dissolved silica and phosphates. In construction technology, sodium aluminate is employed to accelerate the solidification of concrete, mainly when working during frost. Sodium aluminate is also used in the paper industry, for fire brick production, alumina production and so forth.

Sodium aluminate solutions are intermediates in the production of zeolites. Sodium aluminate is a technology product. Sodium aluminate can be added to the mortar mixture to provide faster cooling of the spilled concrete. I also prefer paper and fire resistance. Other uses and forms of use of sodium aluminate are as follows; Sodium aluminate is a substance used for a long time. In this regard, Sodium aluminate is preferred to be used in all sector branches. The automotive industry is an important cleaning material. Used to clean parts such as piston, cylinder head, valve and turbine blades. Metal work, coating or welding prepared. Used for cleaning old stains or rust. Sodium aluminate is used to clean and brighten the matted parts of the metal.

Installation for installation in pipelines, glass decoration works, cleaning of metal surfaces, cleaning of metal molds, cleaning of materials cutting materials such as marble and granite, ceramic. Sodium aluminate is among the non-harmful substances of any effect on human health. Although Sodium aluminate does not cause harm with other substances Sodium aluminate contains, Sodium aluminate can be seen if the similarities of the problems arising in aluminum matter are slightly exposed when exposed directly. These; Sodium aluminate may cause dizziness when the gas is in the air that may come into contact with other substances. If Sodium aluminate comes in contact with the eye Sodıum Alüminate may cause eye irritation. In such a case, the eye should thoroughly wash under constantly flowing water. When touching the skin directly, Sodıum Alüminate causes irritation and slight burning in sensitive areas. Ingestion or contact with mouth may cause stomach ache.

If you are exposed to such conditions, you should consult a doctor.
Sodium aluminate is also necessary to act carefully in the presence of sodium aluminate. Sodium aluminate is an important commercial inorganic chemical. Aluminum hydroxide is an important and accepted source of production. The pure anhydrous sodium aluminate is in the form of a white crystal and the molecular formula is NaAlO2, NaAl (OH) 4 (hydrate), [1] Na2O.Al2O3, or Na2Al2O4. The commercial sodium aluminate may be present in powdered or reconstituted form.

The reaction of compound Na2O and Al2O3 at 1200 ° C occurs as the result. Sodium aluminate is a product obtained from the dissolution of aluminium hydroxide (gibbsite) in sodium hydroxide. IQE produces sodium aluminates in solution, in the form of a transparent liquid, within the ALNA series.

The products of the ALNA series are an excellent source of reactive alumina in alkaline solution and this is the main reason for its use as a raw material in many industrial processes. A method for preparing sodium aluminate from basic aluminum sulfate (BAS) is presented. The process consists of two steps. In the first step, BAS was transformed into sodium dawsonite (NaAl∙(OH)2∙CO3) by treating BAS with sodium carbonate aqueous solution at various temperatures and times.

The best experimental conditions for preparing sodium dawsonite were established. In the second step of this work, sodium aluminate was obtained by heating sodium dawsonite. In this case, several samples of sodium dawsonite were heated at different temperatures in the range of 600-1100°C for 30 minutes. Sodium dawsonite decomposed at 320°C with the evolution of carbon dioxide and water. At 500°C, a pattern corresponding to a transition alumina was observed by X-ray diffraction. The first traces of crystalline sodium aluminate could be detected in the solid heated at 800°C, whereas at 1000°C a mixture of sodium aluminate and alpha alumina was obtained.

Thus, the scheme of phase evolution on progressive heating could be expressed as sodium dawsonite, amorphous, transition alumina (gamma/eta) and crystalline sodium aluminate. By this method, crystalline sodium aluminate could be obtained under mild conditions by heating sodium dawsonite at 900°C for 30 minutes.

Sodium aluminate is an important commercial inorganic chemical. Sodıum Alüminate has been used as an effective source of aluminium hydroxide for many applications. Pure sodium aluminate (anhydrous) is a white crystalline solid having a formula variously given as NaAlO2, Na2O Al2O3, or Na2Al2O4.The commercial importance of sodium aluminate is due to the versatility of its technological applications.

In water treatment systems Sodıum Alüminate is used as an adjunct to water softening systems, as a coagulant to remove suspended solids and some metals (Cr, Ba, Cu), and for removing dissolved silica. In construction technology, sodium aluminate is employed to accelerate the solidification of concrete, mainly when working during frosty periods . Sodıum Alüminate is also used in the paper industry, for refractory brick production and alumina production , etc. Furthermore, Sodıum Alüminate is used as an intermediate in the production of zeolites for detergents, molecular sieves, adsorbents and catalysts .Several methods for preparing solid sodium aluminate have been developed.

In most methods, an aqueous sodium aluminate solution is prepared in a first step. Then, the sodium aluminate solution is dried in order to obtain the solid phase. A typical process for producing aqueous sodium aluminate is by dissolving aluminium hydroxides in a caustic soda solution . In this case, a suspension of aluminum hydroxide with excess NaOH is prepared. Then, the suspension is passed through heated reaction tubes and the resulting sodium aluminate solution is spray dried.

The product of this process is NaAlO2, NaAlO2∙1.5H2O or NaAlO2∙xH2O. In another process, sodium aluminate is prepared by solid state reaction of sodium hydroxide and subdivided aluminum hydrate, at a temperature above the melting point of the caustic soda but below 600°C . Sodıum Alüminate has been reported that sodium aluminate could be recovered from sodium dawsonite found in association with oil shales . In this case, sodium aluminate was obtained by the reaction of homogeneously mixed sodium oxide and aluminum oxide, which were generated during thermal decomposition of sodium dawsonite.

In the present work, the preparation of sodium aluminate was investigated using basic aluminum sulfate (BAS) as a precursor. This latter compound was obtained by homogeneous precipitation of aluminum sulfate aqueous solution using ammonium bisulfite as a precipitant, as reported elsewhere . In the next step of the process, the preparation of sodium dawsonite was investigated by treating BAS with sodium carbonate aqueous solution. Finally, this latter compound was heated at different temperatures to determine the formation temperature of sodium aluminate. Sodium aluminate: white solid, NaAlO2 or Na2Al2O4, which is insolublein ethanol and soluble inwater giving strongly alkaline solutions;m.p. 1800°C. Sodıum Alüminate is manufacturedby heating bauxite withsodium carbonate and extractingthe residue with water, or Sodıum Alüminate may beprepared in the laboratory by addingexcess aluminium to hot concentratedsodium hydroxide. In solutionthe ion Al(OH)4- predominates.

Sodium aluminate is used as amordant, in the production of zeolites,in effluent treatment, in glassmanufacture, and in cleansing compounds. Sodium aluminate, NaAlO2, white solid, (1) by reaction of aluminum hydroxide and NaOH solution, (2) by fusion of aluminum oxide and sodium carbonate, the solution reacts with CO2 to form aluminum hydroxide. Sodium aluminate will dissolve in water and produce a strong corrosive alkaline solution.

May generate heat when water is added. SODIUM ALUMINATE generates a strong base in water; reacts violently with acids and corrosive to metals. Not compatible with copper, tin, zinc, aluminum, acids, phosphorus, or chlorocarbons. Material is caustic. Irritates skin, eyes, and gastrointestinal tract, causing redness of skin and eyes, burning sensation of mucous membranes. Moderate irritant to skin, eyes, and mucous membranes. A corrosive substance. When heated to decomposition Sodıum Alüminate emits toxic fumes of NazO. Used in water and waste treatment; papermaking industry; in printing on fabrics; in the manufacture of pigments, milk glass, and soap; hardening building stone; sizing paper; as a water softener. The aqueous solution is a strong base.

Reacts violently with acid. Incompatible with organic anhydrides; isocyanates, alkylene oxides; epichlorohydrin, aldehydes, alcohols, glycols, caprolactum, chlorocarbons. Corrosive to metals; attacks copper, tin, aluminum, and zinc. Sodium aluminate was introduced to the paper industry over 40 years ago. Its acceptance as an excellent wet end additive grew extensively in Europe and the U.S. paper making operations. Sodium aluminate was found to be very effective when used in conjunction with other cationic sources, such as alum, to optimize and improve wet end paper machine operations. Simply stated, sodium aluminate is an alkaline form of aluminum which has been dissolved in caustic. Aluminum, because of its amphoteric nature, can be easily dissolved either in an acid or alkaline medium. Aluminum dissolved in sulfuric acid forms aluminum sulfate, or alum, and aluminum dissolved in caustic forms sodium aluminate. Sodium aluminate possesses an anionically charged alumina particle.

Sodium aluminate performs two basic functions in the paper maker process. One of these is primarily a chemical function which is to furnish a portion of the alumina required for sizing. Second function is best considered a physical function of coagulation and retention. System conditions created by these two reactions and the reaction products are the basis for the benefits provided by sodium aluminate. All Sodium Aluminate solutions are produced according to EN 882 (Chemicals used for the treatment of water intended for human consumption). Aluminum products reduce chemical sludge production compared to iron, due to the low molecular weight of AI. Aluminates raise the alkalinity of the water, eliminating the need for lime or hydroxides. Sodium aluminate is a product obtained from the dissolution of aluminium hydroxide (gibbsite) in sodium hydroxide. IQE produces sodium aluminates in solution, in the form of a transparent liquid, within the ALNA series.

The products of the ALNA series are an excellent source of reactive alumina in alkaline solution and this is the main reason for its use as a raw material in many industrial processes. Sodıum Alüminate is used in waste water treatment, Sodıum Alüminate is a shotcrete set accelerator; Sodıum Alüminate is also used in the paper industry as an auxiliary refining agent and retaining agent, and other uses are described as a raw material in catalytical supports, zeolites, etc. Sodium Aluminate is most widely used in municipal drinking water and waste water treatment systems. As an alkali, Sodium Aluminate can work in applications where the addition of caustic is not desirable. Sodıum Alüminate provides an economical source of highly reactive alumina.

Liquid sodium aluminate (LSA) is becoming an increasingly popular choice for the removal of phosphorus in municipal and industrial wastewater plants. As discharge limits for nitrogen and phosphorus become more stringent, many plants are implementing both biological and chemical treatment systems for their reduction. However, both these treatment processes can deplete the available alkalinity and depress effluent pH below discharge limits. Solid sodium aluminate of the present invention mainly can use inhibitor, steel surface treatment protective material as water treatment scavenging agent, fine papers shaping auxiliary agent and cement and casting with accelerating chemicals, agate and pottery, also transforms the raw material of using molecular catalyst as amorphous alumina catalyzer and petroleum hydrocarbon.

The difference of solid sodium aluminate series product physical and chemical performance, mainly be because the difference of production technique causes, Sodıum Alüminate is exactly difference in indexs such as adaptability to raw material, granularity, instantly-soluble, insolubles, stability that the difference of production technique causes the difference of product maximum.At present the production technique of solid sodium aluminate can be divided into sintering method, crystallization process substantially, append alkali solution technique, the double salt decomposition method. Sintering method: get industrial Al (OH) 3Or Al 2O 3With addition of Na 2CO 3, at 1000-1100 ℃, reaction generates solid sodium aluminate.But practice shows, is difficult to accomplish that both react completely by mixing, and water-fast Na is always arranged 2O.11Al 2O 3Generate.

Crystallization process: with industrial Al (OH) 3Be dissolved in Na 2O kIn the alkali lye of 500g/l, obtain the solution of α k=10 earlier, be cooled to crystallization below 45 ℃ then and separate out Na 2O.Al 2O 3.2.5H 2O.But the shortcoming of this method is removal attached liquid concentrated base and crystal water rather to bother. Append alkali solution technique: under normal pressure, adopt the mode of appending.Aluminium hydroxide is repeatedly thrown in the alkali lye that is stirring, and the generation that the solution boiling point is accompanied by sodium aluminate solution raises gradually, i.e. rising by the solution boiling point improves synthesis under normal pressure concentration, generates sodium aluminate under wet type high temperature.The liquid sodium aluminate that hypsokinesis goes out is finished in reaction, obtains finished product through solidifying, pulverizing.

The technical conceive cleverness of this method, under normal pressure electric heating,, realized that high pressure steam all is difficult to the temperature of reaction that realizes by the elevation of boiling point, but in the difficulty of controlling that stirs, inclines and, be difficult to industrial production in batches, and the insolubles severe overweight in this method products obtained therefrom. The double salt decomposition method: a considerable amount of aluminum oxide, sodium oxide are contained in sintering process carbon mother liquid the inside.Make the dawsonite that is commonly called as double salt through complete carbonating decomposition, water and carbonic acid gas are sloughed in roasting, just get solid sodium aluminate.But its product index instantly-soluble descends, insolubles increases, and can not adapt to customer requirements.

Above-mentioned several mode respectively has relative merits, and quality product differs from one another, but the ubiquity quality product is low, and is difficult to carry out the shortcoming of industrialized production, adaptability to raw material difference. The object of the present invention is to provide a kind of preparation method of improved solid sodium aluminate, the quality product height, adaptability to raw material is good, carries out industrialized batch easily and produces greatly. The preparation method of solid sodium aluminate of the present invention, by gibbsite and liquid base react thick liquid, after purifying treatment, obtain reacting seminal fluid, will react seminal fluid and carry out spraying drying and get product.

The principal object of the invention is to carry out such a method in a manner which will prevent hydrolysis and decomposition of the product While in a liquid state, and to carry out the process in such a manner that a minimum quantity of unreacted ingredients and/or impurities therein will remain in the final product. Prior methods of producing liquid sodium aluminate consist in reacting bauxite with highly concentrated caustic soda solutions and separation of the liquid product from the so-called redl mud by sedimentation and decantation. This process is open to the objection that Sodıum Alüminate requires cumbersome equipment and that, due to the long periods of time required for such sedimentation and decantation, Substantial decomposition occurs during this period.

Other objections to such prior processes reside in the fact that Sodıum Alüminate has been customary heretofore to react a quantity of caustic soda solution with the full quantity of bauxite Vtheoretically required to combine therewith as a single stage. Inasmuch as commercial bauxite contains a considerable quantity of silica and other insolubles, these impurities find their way into the iinal product withv the result that such sodium aluminate is of a low grade, that is, lower than 85% and rather high in such impurities.

Prior methods of making solid sodium' aluminate involved the roasting at high temperatures of'a mixture of aluminum-bearing materials such as bauxite or aluminum hydrate and alkalies in the dry form. In these methods, calculated amounts of bauxite and alkali either in the form of caustic soda or soda ash are mixed and the mixture roasted for a certain period of time, the time and temperature depending upon the alkali used. When using soda ash, a higher temperature is used for the reaction than when using caustic soda. Sodıum Alüminate will be evident from the nature of this process that all impurities and non-reactable ingredients contained in the bauxite, such as iron oxide, titanium oxide and silica, will find their way into the nal product.

Aluminium hydroxide particles were synthesized from sodium aluminate liquor by urea decomposition method at elevated temperatures in presence and absence of seed. Different parameters such as alumina to caustic (A:C) ratio, temperature, time period of precipitation, urea concentration, etc. were studied.

Characterisations of the products were also carried out using X-ray diffraction, scanning electron microscopy, TG-DTA, etc. In general, higher precipitation ratios were observed with the addition of urea in sodium aluminate solution. Temperature was found to have a significant role in precipitating aluminium hydroxide with higher yield enhancement ratio compared to that obtained at lower temperatures. Higher precipitation ratios were also obtained with urea at elevated temperatures under available supersaturation. In the presence of urea, the precipitation ratios on yield enhancement front were observed to increase with decrease in A:C ratio. Sodıum Alüminate has been observed that the liquor concentration reached below the equilibrium solubility limit after 30 h of precipitation when 460 mmol/L urea is added.

The synthesized aluminium hydroxide particles showed gibbsitic nature and globular morphology, with agglomerates of mostly hexagonal platelets, as revealed through XRD and SEM studies, respectively. Calcination of the product at 1000 °C results in weight loss similar to that observed with gibbsite. Endothermic peaks at 325 °C and 550 °C revealed through DTA study indicated boehmite and chi-alumina transformations, respectively. The possible mechanism of urea decomposition method is also discussed. Sodium aluminate is an inorganic chemical that is used as an effective source of aluminium hydroxide for many industrial and technical applications. Pure sodium aluminate (anhydrous) is a white crystalline solid having a formula variously given as NaAlO2, NaAl(OH)4 (hydrated), Na2O·Al2O3, or Na2Al2O4.

Commercial sodium aluminate is available as a solution or a solid. Other related compounds, sometimes called sodium aluminate, prepared by reaction of Na2O and Al2O3 are Na5AlO4 which contains discrete AlO45− anions, Na7Al3O8 and Na17Al5O16 which contain complex polymeric anions, and NaAl11O17, once mistakenly believed to be β-alumina, a phase of aluminium oxide. In water treatment Sodıum Alüminate is used as an adjunct to water softening systems, as a coagulant aid to improve flocculation, and for removing dissolved silica and phosphates.

In construction technology, sodium aluminate is employed to accelerate the solidification of concrete, mainly when working during frost. Sodium aluminate is also used in the paper industry, for fire brick production, alumina production and so forth. Sodium aluminate solutions are intermediates in the production of zeolites.

SYNONYM:
Sodium aluminum oxide; ALUMINUM SODIUM OXIDE; 11138-49-1; sodium;dioxoalumanuide; Sodium aluminate solution; Dynaflock L; Monofrax H; Alumina-C; Sodium polyaluminate; Maxifloc 8010; Nalco 680; Torganit; Sodium metaaluminate; VSA 45; Aluminium sodium dioxide; EINECS 234-391-6; UN1819; UN2812; J 242 Sodium aluminum oxide; (NaAlO2) Aluminate, sodium AlO2.Na Sodium aluminum dioxide; Sodium aluminate, solid Sodium aluminate, solution EC 234-391-6; Sodium aluminate (NaAlO2) Sodium aluminate (Na2Al2O4) Sodium metaaluminate (NaAlO2) DTXSID3051206 HSDB 5023 Aluminum sodium oxide (Al2Na2O4) EINECS; 215-100-1; 5478AF; FT-0695291; FT-0696529; EC 215-100-1 Sodium aluminate, solid [UN2812] [Corrosive]; Q411155 Sodium aluminate, solution [UN1819]

IUPAC NAME:
Aluminium Sodium Oxide; aluminium(3+) sodium dioxidandiide; Aluminum Sodium Oxide; Aluminum sodium oxide; Sodium alluminate; Sodium aluminate; Sodium aluminate; Sodium aluminum dioxide; sodium oxido(oxo)alumane; sodium; dioxoalumanuideAluminato de sodio; Aluminato de sodio. Sodium aluminate.; Aluminato de sódio; Sodium oxido(oxo)aluminate; Sodium oxido(oxo)aluminium; Sodium oxido(oxo)alumane; sodium dioxoalumanuide; sodium oxido(oxo)aluminum

TRADE NAME:
ALNA; ALSAL; Aluminato sódico; Beta Aranea; Natriumaluminat N7; Natriumaluminatlauge

OTHER NAME:
11108-58-0; 11108-58-0; 11137-64-7; 11137-64-7; 11138-49-1; 1424805-45-7; 1424805-45-7