铅锌混合矿烧结烟尘提硒工艺研究  

Study on process of selenium extraction from sintering dust of lead-zinc mix concentration

作　　者：郭秋松[1] 刘志强[1] 朱薇[1] 

机构地区：[1]广东省工业技术研究院(广州有色金属研究院),广东广州510650

出　　处：《材料研究与应用》2014年第3期203-207,共5页Materials Research and Application

基　　金：广东省科技计划项目(2012B010500023)

摘　　要：采用一段酸浸分离回收锌镉、二段氧化酸性浸硒、SO2还原含硒溶液制取粗硒的工艺,用于处理铅锌混合矿烧结烟尘,提取其中所含的硒.结果表明:以稀硫酸浸出分离烟尘中的锌与镉,锌与镉的浸出率分别达98.5%与99.1%;以硝酸钠为氧化剂在硫酸体系浸取硒,在硫酸浓度为2.0mol/L、搅拌速度为150r/min、反应温度为80℃的条件下,硒的浸出率大于94%;采用SO2气体还原溶液中所含硒,在75℃下反应,控制还原时间100min,溶液中硒的还原率大于95%;在优化条件下,在对烧结烟尘的提硒过程中,硒的直接回收率为89.42%,所得粗硒含硒89.2%.Crude selenium was prepared from sintering dust of lead-zinc mix concentration using two-step leaching technology and reduction-extraction selenium by sulfur dioxide gas .The results shows that ,in the process of separation zinc and cadmium from materials via dilute sulfuric acid leaching route w hen the condition of liquid-solid ratio and leaching time are controlled well ,the leaching rate of Zn and Cd can be a-chieved up to 98 .5% and 99 .1% ,respectively .In the process of oxidation-leaching of selenium w hile sodi-um nitrate as oxidant ,the leaching rate of Se is above 94% w hen the optimum operation parameters are de-termined as follow s ：temperature of 80 ℃ ,stirring speed of 150 r/min and ratio of liquid to solid of 5︰1 , sulfuric acid concentration of 2 .0 mol/L .T he reduction rate of selenium reaches 95% under the reductive temperature is 80 ℃ and the reaction time is 100 min w hile sulfur dioxide gas as the reducing agent .In the w hole process under optimum conditions ,the recovery rate of selenium is above 89 .42% ,and the ultimate selenium content in the crude selenium is 89 .2%.

关 键 词：硒 铅锌混合矿 烧结烟尘 

分 类 号：TQ133.3[化学工程—无机化工]