Property: heat resistance and sinterability

Main chemical composition is Al2O3 and SiO2. Impurity includes alkali, alkaline-earth and iron, titanium, etc and some organic matters. The oxides help the melt and could reduce the refractoriness of material. The lower the content of impurity, especially the Na2O+K2O, the higher the refractoriness is. The closer the ratio of Al2O3/3SiO2 to the theoretical value(A/S=0.85), the higher the purity will be. If the ratio of A/S is higher, the refractoriness will be higher, the sintering range will be wider. The refractoriness of good flint clay could be 1750℃.

Calcined flint clay has properties of volume stability, high strength, low water absorption, etc. Bulk density, porosity, water-absorption and burnt shrinkage rate are the indexes that used to measure the degree of sintering.

Place of origin: mainly in Shandong province, especially Wangcun area. The flint clay of this area has magnetism with good whiteness and brightness.

Application: high-grade refractory production, ceramic manufacture, aluminosilicate refractory fiber production, military industry, etc.

Specification and test index: the chemical composition of flint clay is stable, the export grade is as follows:

(1)Al2O3≥44%;  Fe2O3≤1.5%;  B.D.≥2.45 g/cm3

(2)Al2O3≥45%;  Fe2O3≤1.2%;  B.D.≥2.50 g/cm3

(3)Al2O3≥46%;  Fe2O3≤1.2%;  B.D.≥2.55-2.58 g/cm3

K2O+Na2O+CaO+MgO: <0.5-1.0%

ShanDong ZiBo ShenZi Refractory Materials Co. Ltd was founded in 1998, with two factory sections which cover an area of 120000 square meters. Our company mainly produces bottom bricks of tin bath, big clay bricks, low porosity bricks, high alumina bricks, various light weight bricks, sillimanite bricks, mullite bricks, ramming material, casting material and so on. The products have been exported to many countries, such as Indonesia, Iran, Saudi Arabia, Russia, Japan, Korea, Vietnam, Ukraine, etc.