【摘要】 提出了锑冶炼砷碱渣水热浸出-锑盐氧化-浓缩结晶回收锑、砷、碱新工艺,并进行了工业试验研究。结果表明:以含锑9.86%、砷4.51%的历史堆存锑冶炼二次砷碱渣为原料,在液固比2∶1、浸出温度95℃条件搅拌浸出60 min,再在温度60~80℃时双氧水氧化作用60 min处理后,可实现锑砷的高效分离。研究优化了选择性分步浓缩结晶工艺,在高于80℃条件下反应180 min一步结晶,再冷却至60℃进行两步结晶处理后,实现碱和砷的分离。获得的碱和砷酸钠盐产品利用微波干燥技术,获得了均匀干燥的产品。新工艺实现了工业化应用,砷碱渣处理锑回收率95.27%、砷回收率95.21%;为砷碱渣的资源化处理提供了重要新方法。更多还原

【Abstract】 A new technology including hydrothermal leaching,oxidation of antimony oxide and condensation crystallization was proposed in this paper for arsenic alkali residue from antimony smelting.Based on the lab results,the industrial experimental study upon key technologies was carried out.The findings of the research are as follows:antimony-arsenic efficient separation was realized when adopting pile-up secondary arsenic alkali residue as raw material from antimony smelting,which contains 9.86% antimony and 4.51% arsenic,and after applying hydrothermal leaching and antimonic salt oxidation technology:60min stirring leaching with liquid-solid ratio of 2∶ 1,leaching temperature of 95 ℃,and 60 min hydrogen peroxide oxidation with temperature of 60 ~ 80 ℃.Separation of arsenic and alkali was realized based on selective condensing crystallization technology,which contained two-step treatment:setting crystallization temperature as more than 80 ℃ and crystallization time as more than 180 mins in the first step,and 60 ℃ cooling crystallization in the second step.In the end,it adopted microwave drying technology,to evenly dry crystallized alkali and sodium arsenate.The experimental researches in the industrial scale have successfully realized by achieving 95.27% of Sb recovery and 95.21% of As recovery,which provide a new method for treating arsenic alkali residue.更多还原