Enrichment And Comprehensive Recovery Of Germanium And Indium In Smelting Process Of The Closed Blast Furnace

The analyses on the distribution of zinc, indium, and germanium in the smelting process of the closed blast furnace in Shaoguan smelter were done, and the recovery methods of indium & germanium from the slag by the combined processes of separate-blaze-furnace and electrical furnace, the process vacuum furnace, and fusion-electrolysis process were also studied systematically. The focus study was put on the small-scale and pilot experiments of zinc removal from the hard zinc by vacuum distillation, indium and germanium enrichment, and a new process, i.e. Ball milling→Neural leaching→Oxidation calcination→Chloridizing distillation→Hydrolysis, was designed to recover Germanium from the vacuum furnace slag. The suitable process and operational parameters were determined for the practical production.For the sulfate leaching slag of Maba smelter, the recovery experiments of indium and germanium were carried out and the process of "alkaline melting→aqueous leaching → germanium precipitation " was designed. The new process had the advantage of simplicity, low cost, high recovery rate, high production, little pollution, being an good alternative one for the old process.For the germanium slag from the vacuum furnace of Shaoguan smelter, an new recovery process of germanium was proposed, i.e., "Ball milling→Neural leaching→Oxidation calcination→Chloridizingdistillation→Hydrolysis", and based on the synthetical experiments, the main parameters were determined, and the direct recovery rate of germanium from the vacuum furnace slag was more than 84.7%, leaching rate for zinc was 80-90%, recovery rate for indium from the residual solution by extraction was more than 80%.A new separation method for Ga, In, Ge, Sn, Sb from Fe(III), As, Cd, Pb by liquid-liquid extraction was proposed, and the obtained coarse indium had the purity of 98-99%, with the indium recovery rate being 85-92%.