Product

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Zirconium Silicate

557 397 apa

Description

Zircon or zirconium silicate as an opacifier has the most consumption in ceramic glaze with firing temperature above 1000 ᵒC. opacity of this material is affected with other elements such as aluminum and zinc. The presence of zircon in glaze lead to increase density, resistance to cracking and chemical durability of glaze and reduction of thermal expansion coefficient. High viscosity glaze containing zircon lead to carbon stains even at high temperature. All source of zirconium contain various amounts of hafnium, and since that chemical properties of these materials are similar and the separating processes are very expensive, many grades of zirconia contains more than 3 wt% hafnium.
APA Ceram
Major applications of zircon are in the ceramic, refractory and glaze industries. APA Ceram is supplier of required zircon with high quality from well-known manufacturers.

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Sodium tripolyphosphate

557 397 apa

Mineral salts and derivatives of Weak inorganic acids are effective dispersants in aqueous solutions. Should always be considered, if the absolute value of zeta potential increases dispersant is good. Phosphoric ions are types of ions that prefer to adhere to the clay particles and increase negative charges. In this way, the absolute value of zeta potential is also increasing. Anions can absorb obtrusive ions and form complex. The presence of sodium ions cause the zeta potential becomes more negative. Viscosity of slurry dispersed with polyphosphate, with the passage of time and increasing temperature will rise.
The most important factors in the selection of dispersant include: cost, effectiveness, and sustainability.
Generally a mixture of two or more dispersant is used in ceramics industry, for example combination sodium silicate with tripolyphosphate increases the dispersant efficiency.
Among the factors affecting on dispersion can be cited to pH, water hardness, temperature and time of milling, and ball mills spinning speed.

APA Ceram
One of the main exporters for sodium tri-polyphosphate is China. Based on statistic of Iran’s production, it seems that the light sodium tri-polyphosphate can has significant consumptions in ceramics industry. In this regard, APA Group tries to supply light sodium tri-polyphosphate granules with three density included low-, medium-, and high-density and with high quality from china and thus develop the quality of industrial societies. Beside to preparation sodium tri-polyphosphate in accordance with the certain standards, APA Ceram be able to provide services for control of quality and eliminate of industrial production lines’ defects for and the consultation from delivery step of sodium tri-polyphosphate.

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Kaolin

557 397 apa

From view point of industries, a type of clay that contains large amount of kaolinite is called kaolin. From view of physical properties kaolin is a semi-crystalline material and somewhat amorphous. Special properties of kaolin include adhesion (which increases with increasing purity), colloidal and water absorption ability. Kaolin ore based on type of bond is divided to two group soft bond and hard bond. Kaolin with soft bond and hard bond can be used mainly in tile, ceramic industries and rubber, paper industries, respectively. Kaolin is also widely used in the refractory industry. This material contains 20 to 45 percent of alumina. In chemical and industrial conditions, kaolin in the pH range 3 to 9 may be stable, thus so easily can be used as pigments, coatings and fillers with other compounds. Among the important economic characteristics of kaolin is its particle size.
Characteristics of consumable kaolin in ceramic industry are related to impurities that may cause discoloration of the product after firing. The most important impurity is iron oxide. Other impurities can be copper, chromium and manganese. Allowable amount of Fe2O3 in ceramic is 0.6 to 0.7 percent. Iron oxide in consumable kaolin in porcelain should be less than 0.5% because iron and titanium in ceramic body will react and will reduce transparency. Potash in consumable kaolin in porcelain should be less than 1.5 percent and amounts of titanium and silica should be minimal.
Fine-grained kaolin is preferred in ceramic industry, because fine-grained kaolin increases plasticity and raw body resistance. Selection the type of grading is also very important, although small and soft kaolin reduces the degree of casting but causes contraction during firing.
To summarize the major characteristic of kaolin, which has led to its frequent consumptions can be named as followed:

From chemical view kaolin remains unchanged in a wide range of pH
Having white color
Having a good coating properties
kaolin is soft and non-abrasive
Limited ability to conduct electrical current and heat
cheap price
APA Ceram
Due to the fact that ceramic industries need to Kaolin with constant physical and chemical characteristics, and major consumptions of kaolin are in tile, sanitary ware, and refractory, glaze and color industries. APA Group attempts to be active in importing and supplying of grading kaolin with high purity and constant or uniform quality.