PRODUCTION OF POROUS GLASS MATERIAL FROM RARE-METAL ORE Russian patent published in 2014 - IPC C03B19/08 C03C11/00 

FIELD: metallurgy.

SUBSTANCE: charge based of ore of the following composition in wt %: SiO₂ - 5.1; CaO - 0.9; Al₂O₃ - 5.2; MgO - 0.3; Fe₂O₃ - 54, MnO - 13.1; ZnO - 0.9; SrO - 0.4; P₂O₅ - 5.1; SO₃ - 0.7; TiO₂ - 0.9; Y₂O₃ - 0.3; ZrO₂ - 0.06; BaO - 2.6; Nb₂O₅ - 0.9; La₂O₃ - 2.0; CeO₂ - 3.1; Pr₂O₃ - 0.32; Nd₂O₃ - 0.97; ThO₂ - 0.1, at carbon content of up to 0.5 wt % over 100%, is fused in weakly reducing medium at 1300°C SiO₂/CaO ratio=5.6. Content of Na₂O in ore is increased to 3 wt %. Here, the melt is separated and metal high-phosphorus iron-based melt portion is removed. Residual melt carbon content is increased to 15 wt % over 100% by coal to get strongly reducing medium. SiO₂/CaO ratio is increased to 0.9 by limestone, temperature is increased to 1600°C, and fusing is performed to formation of silicon carbide. The melt is separated in metal and silicate parts. Low-phosphorus iron is removed and melt silicate part is cooled by heat shock to get porous chemically active glass enriched in rare-earth metal oxides suitable for further processing.

EFFECT: expanded sources of raw materials.

2 ex