The editor of Xiao Nian tells you how to deal with the problem of layering of crystalline silicon powder?

During the production process of magnesium-aluminum refractory castable preforms containing crystalline silicon micropowders, the molding surface will often rise, resulting in the phenomenon of product delamination, which will severely affect the service life and yield of refractory products.

There are two types of SiO2 powder: one is made of high-purity silica, and the other is a by-product of metallic silicon or ferrosilicon.

But it needs to have proper physical and chemical functions, otherwise it will affect the use of the product. Generally, the silica powder used in refractories refers to the latter. It is hollow spherical, active, not reunion, good filling, pozzolanic reaction at room temperature, and Al2O3 natural mullite at high temperature, which is beneficial to the strength of the castable progress. In the production process of refractory preforms, it often occurs because of the batch replacement of silicon powder in the raw materials, which causes fluctuations in the molding function of the product. The method to deal with this problem is to first sieve the used silicon powder to homogenize its composition; secondly, in the process of mixing, increase the amount of retarder, increase the amount of water appropriately, and extend the humidity Stirring time, and then molding; appropriately reduce the curing temperature of the product, so that basically the problem can be solved. Among them, the outstanding performance is the rise and delamination of molded products.

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