Take metallurgy grade alumina powder and high purity limestone as raw material,fusing in a large electric arc furnace, then clinker go through fine grinding and homogenizing. Dianka cement has many advantages such as excellent early strength,broad scope of application, stable setting time, make it the first choice of refractory castable manufacturer both in domestic and abroad.
Before leave the factory, Dianka cement will go through the castable test accoring to GB201-2000 standard(5% cement content),it could also be tested according to customer's demanded formula, help them use our cement properly.
Flint clay is a representive of Chinese refractory clay. Normally, flint clay means CALCINED FLINT CLAY, it is calcined clay ore. Its Al2O3 content is about 44%, Fe2O3 less than 2%, with stable compound and dense structure,fracture surface likes broken shells.
Flint clay has no fixed compound. It is like Kaolin clay (Al2O3/3SiO2=0.85), besides some free quartz, it also has very few ferro and alkalis mineral. Common color include: pure white, light gray, light tea-yellow, some are brown.
Flint clay has refractoriness and sinterability. This compound of many aluminum silicate , main component is Al2O3 and SiO2. Oxide impurities will flux the material, lower its refractoriness. Lower the Na2O+K2O content, higher the refractoriness.
As Al2O3/3SiO2 ratio near theoretical value(A/S= 0.85), flint clay is purer, refractoriness is higher, and its sinterablity is better .Top grade fint clay can reach 1750 refractoriness, water absorbtion less than 5%, bulk density bigger than 2.55g/cm3.
