High efficient and clean utilization of coal for the carbothermic reduction of silica

Abstract

In order to alleviate the problems of large amount of reducing agent, low output and high energy consumption in the production process of industrial silicon, TGA, SEM, XRD, Raman spectroscopy and other methods were used to study the properties of carbonaceous materials prepared from distiller’s grains (DG) and soft coal (SC) in the ratio of 20:80 and 50:50, and their effects on the reaction behavior of silica reduction process. The results showed that sorghum distillers’ grains (S-DG) had a strengthening effect when mixed with SC at a 20% mixing ratio, and Tmax and activation energy are reduced. Corn distillers’ grains (C-DG) inhibit the graphitization of SC to a greater extent and produce amorphous carbon structures. Through the silica carbothermal reduction experiment, it was found that there are a large number of SiC diffraction peaks in the S-DG and a small amount of SiO2, but there is basically no SiO2 in the C-DG. This shows that in the process of carbothermic reduction, silica first reacts in large quantities to form SiC, so the reduction effect of C-DG on silica is better.