US 11,746,042 B2
Method for synergistically preparing Ferrosilicon alloy and glass-ceramics from photovoltaic waste slag and non-ferrous metal smelting iron slag
Yufeng Wu, Beijing (CN); Xiaomin Liu, Beijing (CN); and Bin Li, Beijing (CN)
Assigned to BEIJING UNIVERSITY OF TECHNOLOGY, Beijing (CN)
Filed by BEIJING UNIVERSITY OF TECHNOLOGY, Beijing (CN)
Filed on Nov. 23, 2022, as Appl. No. 17/993,844.
Application 17/993,844 is a continuation of application No. PCT/CN2022/099060, filed on Jun. 16, 2022.
Claims priority of application No. 202110723985.0 (CN), filed on Jun. 29, 2021.
Prior Publication US 2023/0091102 A1, Mar. 23, 2023
Int. Cl. C22C 1/02 (2006.01); C03C 10/00 (2006.01); C22C 38/02 (2006.01)
CPC C03C 10/0063 (2013.01) [C22C 1/02 (2013.01); C22C 38/02 (2013.01)] 4 Claims
OG exemplary drawing
 
1. 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.