炼铅氧气底吹炉烟灰浸出液中脱除砷铜研究

为除去炼铅氧气底吹炉烟灰浸出液中的砷和铜, 采用水浸出炼铅氧气底吹炉烟灰、氧化-共沉淀法对浸出液进行除砷、铜, 考察了pH值、H₂O₂用量、聚合硫酸铁用量、反应时间对金属脱除率的影响。试验结果表明, 在100 mL二次浸出液中加入30%的H₂O₂溶液3 mL, 氧化5 min; 再加入10%聚合硫酸铁溶液2.5 mL, 反应5 min; 加1 mol/L NaOH调整溶液pH=6.0, 反应60 min, 除杂效果最好, 砷、铜脱除率分别达99.99%、99.17%。

Removal of Arsenic and Copper from Fly Ash Leachate after Lead Smelting Process with Bottom-blown Oxygen Converter

The fly ash from lead smelting process with bottom-blown oxygen converter was leached with distilled water, and then subjected to the processes of oxidation and co-precipitation for removing arsenic and copper from the leachate. The influences of pH value, dosages of H₂O₂ and polymerized ferric sulfate, as well as reaction time on the metal removal rate were investigated. Results showed that arsenic and copper removal rate reached 99.99% and 99.17%, respectively, after being subjected to the following processes: firstly, an oxidative reaction for 5 min by adding 3 mL of H₂O₂ in 100 mL of secondary leachate at the amount of 30%, followed by another 5 min reaction after adding 2.5 mL of polymerized ferric sulfate at the amount of 10%, finally 60 min reaction after the solution conditioned with 1 mol/L NaOH to pH=6.0.