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Calcined kaolin of high temperature calcination (above 450.degree.C (842.degree.F)) of naturally occurring kaolin, a hydrated aluminum silicate, resulting in the evolution of water and the formation of new substances depending upon the calcination temperatures employed.
Calcined kaolin is produced by heating ultrafine natural kaolinite to high temperatures in a kiln.
Calcined kaolin is not commonly used in traditional ceramics, except for specifics mentioned below, but it is a commodity material in many industries.
CAS Number: 92704-41-1
EINECS Number: 296-473-8
Kaolin, calcined, 92704-41-1, Calcined kaolin, DTXSID30107899, EC 296-473-8, EINECS 296-473-8
Calcined kaolin is pure clay mineral, having a fired chemistry of 1 part Al2O3 and 2 parts SiO2.
But the raw clay crystals are hydrated, having 12% crystal-bound water.
This is the secret to their plasticity.
Al2O3 is essential to the chemistry of the vast majority of glazes and kaolin is ideal source material.
Calcined kaolin has many other uses in ceramics.
They key property it has is that it is refractory.
Calcined kaolin is useful in refractory castables and furniture, thermal insulation bodies, low expansion bodies and permeable ceramic compositions.
Calcined kaolin is pure clay mineral, having a fired chemistry of 1 molar part Al2O3 and 2 parts SiO2.
Calcining the material removes that water and destroys the plasticity.
Various grades of calcined kaolin are produced by varying parameters in the calcination process (e.g. retention time in the rotary kiln, firing temperature).
Calcination initially converts it to metakaolin (whose reactivity makes it useful in cements).
The calcination process increases whiteness and hardness and alters the size and shape of the kaolin particles.
Further heating whitens it more and reduces reactivity while still keeping abrasiveness low.
Still, more calcination converts the crystals to mullite, making them much more abrasive.
Calcined kaolin has an important use in ceramic glazes.
Al2O3 is essential to the chemistry of the vast majority of glazes and its most readily-meltable natural supplier is feldspars, however they most often oversupply KNaO in providing the needed Al2O3.
Raw kaolin is an ideal second or even primary source of Al2O3.
Not only does it readily decompose in the melt but it also supplies SiO2 that all glazes need.
And Calcined kaolin acts to suspend the slurry and harden the dried layer.
But there is a problem with raw kaolin: Once recipe percentages pass 20% shrinkage becomes too high (causing crawling).
In these cases substituting part of the raw kaolin for calcined kaolin solves the problem, maintaining the chemistry of the glaze but reducing the shrinkage and cracking.
Of course, mixing the raw and calcined materials must take into account the LOI of the raw material (12% less calcined is needed).
Calcined kaolins are also useful in tuning the shrinkage and plasticity of slips (engobes) which are applied to wet or leather-hard ware.
Engobes contain higher clay percentages than glazes and it is more important to control their drying shrinkage.
Thus, like for glazes, they can be substituted for part of the raw kaolin to tune drying while maintaining fired properties.
Calcined kaolin is refractory and softens at about cone 35.
Calcined kaolin is thus useful in refractory castables and furniture, thermal insulation bodies, low expansion bodies, permeable ceramic compositions, and investment casting (see molochite).
Calcined Kaolin or Calcined Clay is also called as Metakaolin or Chamotte.
Calcined kaolin is an an anhydrous aluminium silicate, a white powdered non-plastic material).
Calcined kaolin is produced when raw kaolin or more popularly known as Clay or China Clay is fired enough to reduce its crystalline water content via a process known as Calcination.
Calcined kaolin are produced from highly refined kaolin through grind, calcination and Classification.
Calcined kaolin has high purity and the quality is stabled.
Calcined kaolin offers superfine particle and with excellent anti-settling property; It can easily disperse in water based systems.
Calcined kaolin is inert to most acids and alkaline at Ambient temperature and offers good anticorrosive capabilities.
Calcined kaolin is a natural occurring raw material, which is refined to an industrial raw material by extent processing.
Calcined kaolin is separated of its accessory minerals by water separator technique.
The classification in different grain size distributions takes place through drum washers, cyclone classifiers and centrifuges.
Subsequent dewatering by sedimentation, filtration and drying takes place. Bleachery and magnetic separator improve several kaolin products.
Calcined kaolin refers to kaolin clay that has been heated to a high temperature, typically above 600 degrees Celsius (1,112 degrees Fahrenheit).
This process, known as calcination, transforms the mineral kaolinite present in the kaolin clay into metakaolin, which has different properties compared to the original kaolin.
Calcined kaolin is known for its increased whiteness, brightness, and altered physical and chemical properties, making it suitable for various industrial applications.
Calcined kaolin is often used in the production of ceramics, refractories, paper, paint, rubber, plastics, and other products where its improved characteristics are beneficial.
Calcined kaolin is a clay mineral, also known as China clay or kaolin.
Calcined kaolin clay is used as a functional extender in paint.
Kaolin clay is also used in grounds, such as for painting and gilding.
Calcined kaolin is one of the most indispensable fillers in the paint industry; a natural clay raw material, containing Ca and Na.
Calcined kaolin is a raw material characterized by kaolinite mineral.
In industrial use, it is included as calcined in the production part under kaolin.
The raw materials in which kaolinite is enriched and used in kaolinitic and others are included in clay raw materials.
The brightness, corrosivity, viscosity and grain size distribution- max grain size-shape and the rheology (water + clay behavior) of these kaolins are very important.
All these properties are determined by the conditions of formation of kaolin and improved by post-production processes.
Calcined Kaolin is produced by calcining (firing, sintering) kaolin clay or kaolinite rock (flint clay).
Calcination is mainly carried out in rotary kilns, but also in shaft kilns, ring kilns and tunnel kilns.
There are chamottes with different alumina contents and correspondingly different refractoriness.
Depending on the chemical composition, different levels of corrosion and acid resistance are achieved.
Fireclay can be supplied as a raw material in a fineness of 0 to 25 mm or 0 to 50 mm, but also in finished refractory grain sizes and finenesses.
Calcined kaolins are fired to a temperature high enough to effect loss of crystal water (and accompanying mineral change).
Calcined kaolin normally converts to mullite during this process.
Calcined kaolin is valuable in glaze formulations that contain high amounts of kaolin to source alumina, and which are thus subject to shrinkage and cracking-during-drying problems.
By substituting some of the raw kaolin for calcined (such as Glomax), the physical properties of the glaze slurry can be controlled without impacting the chemistry of the fired melt.
Mixing the two materials must of course take into account that raw kaolin has a 14-15% loss on ignition (or LOI) that the calcined material does not.
Calcined kaolins are also useful in tuning the shrinkage and plasticity of slips which are applied to wet, leather hard or dry ware.
Because their shrinkage is very low, they can be substituted for part of the regular kaolin and there will likewise be minimal impact on the fired properties.
Kaolin Powder is a white clay-like mineral widely used for paper and ceramics.
Despite its similarities, calcined Kaolin Powder undergoes a unique process to achieve its unique properties.
The process involves heating the kaolin to a high temperature, which alters its chemistry, making it more suitable for various applications.
Calcined Kaolin Powder has some amazing properties that make it highly sought after in many industries.
Its high brightness and whiteness make it an excellent substitute for titanium dioxide in paint and coatings.
Calcined kaolin also has excellent thermal and electrical insulation properties, which make it ideal for use in ceramics and refractories.
Calcined Kaolin Powder is a complex product that involves many steps throughout the production process.
However, the end result is a unique substance that has a wide range of applications and benefits.
Calcined Kaolin Powder, also known as Metakaolin, is a processed form of kaolin clay that has been heated at high temperatures (typically between 600 and 800 degrees Celsius) to remove water and other volatile compounds.
This calcination process alters the physical and chemical properties of kaolin, making it suitable for various applications in the construction industry.
Calcined kaolin can be used as a supplementary cementitious material (SCM) in the production of cement and concrete.
When added to cement or concrete mixtures, it enhances the strength, durability, and workability of the material.
Calcined kaolin acts as a pozzolan, reacting with calcium hydroxide produced during the hydration process of cement to form additional cementitious compounds, resulting in improved performance and reduced environmental impact.
Calcined kaolin is often used in the formulation of mortars and grouts to improve their workability, reduce shrinkage, and enhance adhesion.
Calcined kaolin acts as a filler, providing a smoother consistency to the mixture and reducing the amount of water required for proper hydration.
Geopolymer concrete is an alternative to traditional cement-based concrete that uses a binder composed of aluminosilicate materials.
Calcined kaolin, with its high aluminum content, can serve as a valuable precursor for geopolymer binders, helping to create strong and environmentally friendly construction materials.
Calcined kaolin powder is widely used in the production of paint, coatings, and sealants for construction applications.
Calcined kaolin acts as an extender pigment, enhancing the opacity, brightness, and durability of the coatings.
Calcined kaolin also contributes to improved rheology and reduced cracking.
Fiber cement boards, tiles, and panels are widely used in the construction industry due to their durability and fire resistance.
Calcined kaolin is added to the formulation of fiber cement products as a filler, providing improved strength, dimensional stability, and resistance to weathering.
Calcined kaolin is utilized in the manufacturing of ceramic and porcelain tiles to enhance their strength, whiteness, and firing characteristics.
Calcined kaolin improves the workability of the clay mixture, reduces shrinkage during firing, and helps achieve a smooth and glossy finish.
Calcined kaolin can be incorporated into insulating materials, such as thermal insulation boards, refractories, and firebricks, due to its high melting point, low thermal conductivity, and good resistance to high temperatures.
Calcined kaolin powder can be used in road construction as an additive to bituminous materials, such as asphalt, to enhance their stability, durability, and resistance to rutting and cracking.
Calcined kaolin is extensively used in the ceramics industry as a component in the production of ceramic bodies and glazes.
Calcined kaolin improves the strength, whiteness, and thermal stability of ceramic materials.
Additionally, Calcined kaolin is employed in the manufacturing of refractory bricks and castables due to its high melting point and resistance to heat.
Calcined kaolin is utilized as a filler and coating pigment in the paper and packaging industry.
Calcined kaolin enhances the smoothness, brightness, opacity, and printability of paper products.
Calcined kaolin also improves the ink absorption properties and reduces ink bleed, resulting in sharper printed images.
Calcined kaolin acts as an extender pigment in the formulation of paints and coatings.
Calcined kaolin enhances opacity, provides excellent hiding power, and contributes to improved durability and weather resistance.
Calcined kaolin is widely used in architectural coatings, industrial paints, and automotive coatings.
Calcined kaolin is used as a reinforcing filler in plastic and rubber applications.
Calcined kaolin improves mechanical properties, such as tensile strength, modulus, and impact resistance.
Calcined kaolin also enhances dimensional stability, reduces shrinkage, and improves the surface finish of plastic and rubber products.
Calcined kaolin is employed in various personal care products, including cosmetics, skincare formulations, and hair care products.
Calcined kaolin serves as an absorbent, bulking agent, and opacifying agent.
Calcined kaolin helps control oiliness, provides a silky texture, and imparts a matte finish in cosmetic products.
Calcined kaolin is used in pharmaceutical formulations as an excipient and filler.
Calcined kaolin aids in tablet formation by improving flow properties and compressibility.
Calcined kaolin can also be used in topical ointments and creams for its absorption properties and rheological benefits.
Calcined kaolin is utilized in the production of polishes and polishing compounds.
Calcined kaolin provides a fine abrasive action, which helps in achieving a smooth and glossy finish on various surfaces, including metals, plastics, and glass.
Calcined kaolin can be used as a support material for catalysts in chemical processes.
Calcined kaolin offers a high surface area, pore volume, and thermal stability, making it suitable for catalytic applications.
Calcined kaolin is an anhydrous aluminium silicate produced by heating natural china clay to high temperatures in a kiln.
This calcination process gives an increase in hardness and alters the particle shape of the kaolin.
When calcination occurs at around 700°C, the dehydroxylation of the kaolin is complete, forming a partially crystalline metakaolin.
Fully calcined products with an amorphous defect spinel structure are formed above 980°C.
Fully calcined kaolin can be treated with silane to give a particle surface capable of chemically coupling with the polymer.
Calcined kaolin is derived from the mineral Kaolinite which comes from the Earth’s crust.
Calcined kaolin is an aluminum silicate represented as Al2O3•2SiO2•2H2O.
Calcined kaolins can be used in a wide variety of applications like architectural and industrial coatings, construction, rubbers, plastics, packaging and papers.
Calcined kaolin is employed as a reinforcing agent in rubber compounds.
Calcined kaolin enhances tensile strength, tear resistance, and abrasion resistance in rubber products.
Calcined kaolin can be used as a carrier or diluent in the production of fertilizers.
Calcined kaolin is inert nature and particle size make it suitable for blending with other fertilizer components.
In water treatment applications, calcined kaolin is used to remove impurities and contaminants.
Calcined kaolin is adsorption properties help in the clarification and purification of water.
Calcined kaolin is sometimes incorporated into cement and concrete formulations to improve workability and reduce water demand.
Calcined kaolin can also contribute to the overall durability and performance of concrete.
The high surface area and porous structure of calcined kaolin make it suitable as a catalyst support in various chemical processes.
In animal nutrition, calcined kaolin may be used as an additive to improve digestibility and provide essential minerals.
Calcined kaolin can find applications in the oil and gas industry, such as in drilling fluids and cementing operations, where its properties contribute to fluid control and wellbore stability.
Due to its light-scattering properties, calcined kaolin is used in the production of photocopier and printer toners.
Calcined kaolin is employed in the production of glass fiber reinforcements, where its addition enhances the strength and performance of glass fiber composites.
Calcined kaolin serves as a raw material or processing aid in various chemical manufacturing processes.
Density: 2.399g/cm3 at 20℃
form: Powder
Calcined kaolin is a non-metallic mineral, a clay and clay rock dominated by kaolinite clay minerals.Because it is white and delicate, it is also called dolomite.
Calcined kaolin is pure kaolin is white, fine and soft, with good physical and chemical properties such as plasticity and fire resistance.
Calcined kaolin is mineral composition is mainly composed of kaolinite, halloysite, hydromica, illite, montmorillonite and quartz, feldspar and other minerals.
Calcined Kaolin for Ultramarine is a dehydroxylated aluminum silicate produced at a controlled temperature heating of a water-fractionated kaolin.
Calcined kaolin was specifically designed for Ultramarine products.
Calcined kaolin can greatly improve the acid resistance of Ultramarine products due to its high purity, and it can also help improve the coloring power due to better metakaolin activity.
Calcined kaolin has better sintering properties, because its raw material is raw ore of coal kaolin blending with natural kaolin ore.
Calcined Kaolin is produced by calcining (firing, sintering) kaolin clay or kaolinite rock (flint clay).
Calcination is mainly carried out in rotary kilns, but also in shaft kilns, ring kilns and tunnel kilns.
There are chamottes with different alumina contents and correspondingly different refractoriness.
Depending on the chemical composition, different levels of corrosion and acid resistance are achieved.
Fireclay can be supplied as a raw material in a fineness of 0 to 25 mm or 0 to 50 mm, but also in finished refractory grain sizes and finenesses.
Calcined kaolin is chemically knowns as hydrated Aluminum silicate used any many industries such as Ceramic (Glaze, Engobe, Body grade), Paper, Plastic, Rubber, Pharmaceuticals, Porcelain, Cosmetic, Ink, Dyes, Fiberglass, and Paint Industry.
Calcined kaolin is derived from clay mineral mainly from China clay however Sandy clay and potash clay is also used for kaolin manufacturing.
Calcined kaolin is a layered silicate mineral and is found in many parts of the world, especially in India.
A clay mineral in rough format (Direct from mines) has impurities and metallic properties.
Calcined kaolin is widely used in the ceramics industry as a raw material in the production of porcelain and fine china.
Calcined kaolin is high firing temperature and improved properties make it a valuable component in ceramic formulations.
The enhanced whiteness and opacity of calcined kaolin make it a popular extender in paint and coating formulations.
Calcined kaolin contributes to the reduction of titanium dioxide (TiO2) content while maintaining or improving performance characteristics.
In the paper industry, calcined kaolin is used as a coating material to improve printability, opacity, and ink receptivity.
Calcined kaolin helps control ink holdout and enhances the paper's surface properties.
Calcined kaolin is utilized as a functional filler in the production of plastics and rubber goods.
It improves mechanical properties, reduces shrinkage, and enhances dimensional stability in molded products.
Calcined kaolin finds application in refractory materials where its high temperature stability and low impurity content are advantageous.
Due to its fine particle size and rheological properties, calcined kaolin is used in adhesives and sealants to control viscosity, reinforce formulations, and improve adhesion.
Calcined kaolin is used in fiberglass production to improve the strength and resistance of glass-reinforced plastic composites.
Additionally, calcined kaolin can be used as a filler in thermal insulation materials.
In the cosmetic and personal care industry, calcined kaolin may be used in formulations such as face masks, powders, and creams for its absorbent and texturizing properties.
Calcined kaolin is used in the formulation of adhesives and sealants to improve rheological properties, stability, and performance.
In the cosmetics industry, calcined kaolin is used in the formulation of various skincare and cosmetic products, including foundations, powders, and masks, due to its absorbent and texturizing properties.
Calcined kaolin may find applications in the pharmaceutical industry for its use as an excipient, contributing to the flow properties and compressibility of pharmaceutical powders.
Calcined kaolin is utilized in plastics and polymers to improve properties such as impact resistance, tensile strength, and dimensional stability.
In the ceramics industry, calcined kaolin is a crucial component in the production of porcelain and other ceramics.
Calcined kaolin contributes to the fired color, strength, and other properties.
Calcined kaolin is used as a filler in the paper and pulp industry to improve paper properties like opacity, brightness, and printability.
Calcined kaolin is a common extender pigment in paints and coatings, contributing to improved hiding power, rheology, and durability.
In the textile industry, Calcined kaolin is used as a processing aid to improve the smoothness and texture of fabrics during manufacturing.
Calcined kaolin can be used in electronic components and materials due to its insulating properties and compatibility with various manufacturing processes.
In the production of abrasive materials, calcined kaolin can be added to enhance the abrasion resistance and hardness of the final product.
Calcined kaolin is used in the manufacturing of rubber belts and hoses to improve strength, flexibility, and resistance to wear and aging.
Calcined kaolin is utilized in anti-corrosion coatings to enhance barrier properties and improve the coating's resistance to chemicals.
Uses Of Calcined kaolin:
Calcined kaolin is widely used in paper, ceramic and refractory materials, secondly in coatings, rubber fillers, enamel glazes and white cement materials, and in small quantities in plastics, paints, pigments, grinding wheels, pencils, household cosmetics, soaps,
Industrial sectors such as pesticides, medicine, textiles, petroleum, chemicals, building materials, and national defense.
Calcined kaolin pigment can be applied in latex paint, powder coating and electrophoresis coating, filing, paper making industry, ceramic, rubber, and plastic.
Widely used in the paint and coatings industry as a functional extender and pigment that contributes to improved opacity, sheen control, and rheology.
Incorporated into plastic formulations to enhance mechanical properties, such as tensile strength and impact resistance, and to provide improved dimensional stability.
Applied in the paper industry as a coating pigment to enhance printability, brightness, and smoothness of paper surfaces.
Calcined kaolin is used as a catalyst support in various catalytic processes due to its high surface area and porous structure.
Employed in adhesives and sealants to improve performance characteristics such as viscosity control, reinforcement, and adhesive strength.
Calcined kaolin is utilized in cosmetic formulations, such as powders and creams, to provide a smooth texture, absorbency, and opacity.
Calcined kaolin is used in pharmaceutical formulations as an excipient to improve tablet hardness and disintegration.
Applied in the production of porcelain and ceramics to enhance strength, whiteness, and firing characteristics.
Included in refractory materials for its high temperature resistance and ability to improve the thermal shock resistance of the final product.
Calcined kaolin is used in fiber cement products, such as boards and tiles, to enhance strength, flexibility, and resistance to weathering.
Calcined kaolin is utilized in foundry sands to improve casting properties, reduce veining, and enhance surface finish in metal casting.
Incorporated into electronic components, such as capacitors and insulators, due to its dielectric properties and high-temperature stability.
Applied in textiles as a functional filler to improve fabric properties, such as tear strength and abrasion resistance.
Added to concrete and cement formulations to improve workability, reduce permeability, and enhance durability.
Calcined kaolin is used as a reinforcing filler in the production of rubber products, such as tires, to improve strength, tear resistance, and flexibility.
Employed as a coagulant in water treatment processes to remove impurities and enhance water quality.
Calcined kaolin is used as a pigment extender in printing inks to improve color strength and printability.
Incorporated into fiberglass and composite materials to enhance strength, impact resistance, and dimensional stability.
Utilized in environmental applications, including soil remediation, due to its adsorption properties.
Applied in the petroleum industry as a functional filler in drilling muds to control viscosity and filtration.
Calcined kaolin is used as an anticaking agent in animal feed to prevent clumping and improve flowability.
Included in the formulation of fire-resistant materials for its high temperature stability.
Added to thermoplastic materials to improve mechanical properties and reduce shrinkage during molding.
Calcined kaolin is used in agriculture as a carrier in pesticides and fertilizers to enhance dispersibility and effectiveness.
Utilized in the development of geopolymers, an eco-friendly alternative to traditional cement, for construction applications.
Calcined kaolin is used as a filler and rheology modifier to enhance the stability and performance of adhesives and sealants.
Employed in cosmetic formulations, such as foundations and powders, for its absorbent properties and texture-enhancing capabilities.
Calcined kaolin is used as an excipient in pharmaceutical formulations to improve flow properties and compressibility of powders.
Added to plastics and polymers to enhance properties like impact resistance, tensile strength, and dimensional stability.
Essential component in the production of porcelain and ceramics, contributing to fired color, strength, and other properties.
Calcined kaolin is used as a filler to improve paper properties like opacity, brightness, and printability.
Commonly used as an extender pigment in paints and coatings to improve hiding power, rheology, and durability.
Employed as a processing aid in the textile industry to improve the smoothness and texture of fabrics during manufacturing.
Calcined kaolin is used in electronic components and materials due to its insulating properties and compatibility with various manufacturing processes.
Added to abrasive materials to enhance abrasion resistance and hardness.
Utilized in the manufacturing of rubber belts and hoses to improve strength, flexibility, and resistance to wear and aging.
Calcined kaolin is used in anti-corrosion coatings to enhance barrier properties and improve resistance to chemicals.
Safety Profile Of Calcined kaolin:
The primary hazard associated with calcined kaolin is the generation of airborne dust during handling and processing.
Prolonged inhalation of fine particles may lead to respiratory irritation.
Workers should use appropriate respiratory protection and work in well-ventilated areas to minimize dust exposure.
While calcined kaolin is generally regarded as non-irritating, direct contact with the eyes or skin may cause irritation in some individuals.
In case of contact, rinse affected areas with water.
Ingestion of calcined kaolin is not a common route of exposure.
However, it is advisable to avoid ingestion, and workers should follow good hygiene practices, such as washing hands before eating.
Calcined kaolin is not combustible.
Calcined kaolin does not pose a fire hazard under normal conditions of use.
Avoid contact with strong acids and alkalis, as well as incompatible chemicals.
Follow guidelines for safe storage and handling of chemicals.
