Separation and enrichment of germanium in zinc oxide dust leaching solution by leaching after neutralizing precipitation
To solve the problems of recovery germanium by tannin precipitation method in the hydrometallurgy zinc process,such as high tannin consumption,the high costs for germanium recovery which is caused by rising price of tannin,and the adverse effects of tannin which brings in organics on the hydrometallurgy zinc system,the recovery process of germanium through leaching after neutralizing precipitation from zinc oxide dust leaching solution by industrial zinc oxide dust was studied.The results show that neutralized germanium precipitation is obtained through a two-stage countercurrent neutralization and precipitation process,under the conditions of the first-stage neutralization temperature of 45℃,time of 2.0 h,and pH of 4.0-4.5,and the second-stage neutralization temperature of 45℃,time of 1.5 h,oxygen flow rate of 60 L/h,and pH of 5.0-5.2.The germanium mass fraction of the neutralized germanium precipitation is 1.34%,the germanium mass concentration in the liquid of precipitated germanium is 1.98 mg/L,and the germanium precipitation rate is above 99%.Under the condition of leaching temperature of 150℃,time of 4.0 h,oxygen pressure of 0.7 MPa,and final sulfuric acid mass concentration of 30 g/L,the leaching rates of germanium,iron,arsenic,and silicon in the neutralized germanium precipitation are 86.54%,23.74%,54.41%and 10.53%,respectively.The germanium mass concentration in the oxygen pressure leaching solution is 1.80 g/L,which is 9.06 times of that in the original solution.The germanium-to-iron ratio increases from 0.05 to 1.18,and the germanium-to-arsenic ratio increases from 0.34 to 3.11.The germanium-to-silicon ratio increases from 1.26 to 7.65.Under the conditions of leaching temperature of 90℃,time of 2.0 h,oxygen-enriched atmosphere,and final sulfuric acid mass concentration of 100 g/L,the leaching rate of germanium in the oxygen pressure leaching residue increases to 95.31%.
neutralization and precipitationoxygen pressure leachingenrichment of germaniumseparation of impurity
甄勇、王梓澎、邓志敢、陆占清、魏昶、戴兴征、李兴彬
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昆明理工大学冶金与能源工程学院,云南昆明,650093
云南云铜锌业股份有限公司,云南昆明,650032
云南驰宏锌锗股份有限公司,云南曲靖,655011
中和沉淀 氧压浸出 富集锗 分离除杂
云南省科技人才计划项目云南省重大科技专项云南省重大科技专项昆明理工大学分析测试基金资助项目Science and Technology Talent Program of Yunnan ProvinceMajor Scientific and Technological Projects of Yunnan ProvinceAnalysis and Test Fund of Kunming University of Science and Technology
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