Although the aggregate and powder in the traditional aluminate cement refractory castable have high accumulation density and density, the water consumption is large in the construction process, and many pores are filled by water. After the moisture volatilizes, the pores re-appear and the strength becomes low. Low cement refractory castables, the cement content of 8% or less, the construction of the water consumption is 7% or less, in addition to superfine powder of low cement refractory castable will fill in the process of using the structure clearance, make the structure more compact, porosity will be reduced, so the strength, wear resistance and other properties compared with traditional aluminate cement refractory castable is better.
The production methods of ultrafine powder are divided into mechanical crushing method and chemical preparation method. The former has simple production technology, large output, no agglomeration of micro powder and low cost. The product made by the latter has high purity, small particle size and easy to control its shape and particle size distribution, but high cost and easy to aggregate. In unshaped refractory bulk refractory, ultrafine powder technology is widely used in the varieties: active SiO2 powder and powder - Al2O3 powder, followed by SiC powder, high aluminum powder, white corundum powder, zirconium powder and spinel powder. Generally speaking, the smaller the particle size of ultrafine powder, the greater the performance improvement of refractory castable, but the cost will also rise. In the actual use of ultrafine powder, powder not more than 5 m accounts for 40% - 80%.
Zhengzhou Rongsheng Kiln Refractory Co.,Ltd. is professional refractory castable manufacturer, production of various refractory products for more than 20 years, rich production experience, strong technical force, we sincerely hope that you have refractory material demand customers come to contact us.
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