Properties of silicon slag

Silicon slag is a water-based mixture obtained from zircon sand after alkali melting, acid leaching, and water dissolution. It is a colloidal polymer with high water content, with a light yellow green appearance, a sponge like shape, strong adsorption, and a complex structure. The main components are silicic acid and water, which are acidic after water immersion, with pH<1 and a solid content of about 20%. Due to the chemical reaction in the production process, there are also metasilicic acid, orthosilicic acid, dimethylsilicic acid, triorthosilicic acid and other silicic acid series products in the silicon slag, as well as Sodium metasilicate, unreacted zirconium sand and zirconium oxychloride, whose structure is not yet clear. Due to intermittent alkali melting operation, different particle size composition of zircon sand, and different decomposition rates of zircon sand, the content of and fluctuates greatly. The general composition is shown in the right figure.