How to deal with the delamination of crystalline silicon powder?

In the production process of magnesium aluminum refractory castable preforms containing crystalline silicon powder, the molding surface often rises, resulting in the delamination of products, which will seriously affect the service life and yield of refractory products.

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

But it needs not disordered physical and chemical function, otherwise it will affect the use function of the product. Generally, the silicon powder used in refractories refers to the latter, which is hollow and spherical, active, not agglomerated, good filling, pozzolanic reaction at room temperature, and natural Mullite with Al2O3 at high temperature, all of which are conducive to the improvement of castable strength.

In the production process of fire-resistant prefabricated parts, it often occurs that the molding function of products fluctuates because of batch replacement of silicon powder in raw materials. The method to deal with this problem is: first, screen the silicon powder to homogenize its composition; secondly, in the process of mixing, increase the amount of retarder, increase the amount of water, extend the wet mixing time, and then form; reduce the curing temperature of the products, so that the problem can be basically solved. Among them, the outstanding performance is the rising stratification of products after molding.

If you want to know more about crystalline silicon powder, you can consult Jiangsu crystalline silicon powder manufacturer Haosen in detail.