Method for synergistically preparing Ferrosilicon alloy and glass-ceramics from photovoltaic waste slag and non-ferrous metal smelting iron slag

A method for preparing ferrosilicon alloy and glass-ceramics from silicon slag and zinc rotary kiln slag characterized in that:

• raw materials include zinc rotary kiln slag mixture and silicon slag, whose mass percentages are 45-60 and 40-55 respectively, and the sum of mass percentage of zinc rotary kiln slag mixture and silicon slag is 100%;
• chemical components of the silicon slag are:
• SiO2, CaO, Al2O3, Na2O, K2O, MgO, and ZnO, wherein the silicon in the silicon slag exists in the form of elemental silicon, silicon carbide and calcite;
• the zinc rotary kiln slag mixture includes zinc rotary kiln slag and a reducing and tempering agent, wherein the reducing and tempering agent includes coke, albite, and borax;
• the method includes the following main steps:
• (1) prepare a reduced iron-containing material, and weigh rotary kiln slag, coke, albite and borax according to the formula to form a rotary kiln slag batch, and the batch is melted to form a reduced iron-containing material;
• (2) prepare ferrosilicon alloy and glass-ceramic, mix and melt the reduced iron-containing material formed in step (1) with silicon slag, and clarify to form a base glass liquid, and the obtained base glass liquid is quenched and sorted to obtain a ferrosilicon alloy;
• the residue is further tempered, melted, quenched and crystallized to obtain the glass-ceramic;
• the melting temperature of the rotary kiln slag batch material is 1450-1500° C., and the temperature is kept for 2-3 hours to obtain the reduced iron-containing material;
• the mixing temperature of the reduced iron-containing material and the silicon slag is 1450-1550° C., and the mixing time is 1-2.5 h, to form a uniform base glass liquid;
• transfer or pour the molten base glass liquid into pre-prepared water below or equal to 30° C. to form ferrosilicon alloy and water quenching residue;
• filter the alloy slag from the water, and get the ferrosilicon alloy after sorting, and dried at 120-150° C.