The method of reusing the waste sand of precision casting includes mullite, mullite, zircon and zircon sand, which is characterized in that: the waste sand of precision casting is cleaned, dried, crushed and sieved to make the aggregate and powder of the refractory castable, and then the mixture of binder and admixture is added to make the refractory castable.
Next, we will talk about the recycling method of precision casting waste sand. The specific preparation method is as follows:
a. Wash and dry the waste sand of precision casting until the water content is no more than 1%;
b. The spare sand in step a is crushed by jaw crusher, and the powder is removed by magnetic separation and acid pickling;
c. The spare raw materials in step B shall be screened and graded and put into storage separately;
d. The spare raw materials of step C are prepared into the aggregate and powder of refractory castable according to a certain particle level, and the binder and admixture are added to mix and homogenize.
The method for reusing the waste sand of precision casting is characterized in that: the admixture is at least one of sodium lignosulfonate, sodium tripolyphosphate or sodium hexametaphosphate; the binder is at least one of pure calcium aluminate cement, Portland cement, β - crystalline aluminum oxide, silica sol or water glass; the mass mixing of aggregate, powder, binder and admixture in step d The ratio is 30-40:40-50:10-15:0.2.