无污染砷碱渣处理技术工业试验

来源期刊：中南大学学报(自然科学版)2005年第2期

论文作者：仇勇海 卢炳强 陈白珍 钟宇 傅伟 杨一乾

文章页码：234 - 237

关键词：砷碱渣;废渣处理;环境保护

Key words：slag of arsenic and soda; waste disposal; environmental protection

摘    要：以锑冶炼产生的砷碱渣为原料,在80℃下,搅拌约2 h浸出脱锑;在脱锑后液中通入二氧化碳气体,脱除碳酸盐;调整脱碱后液的pH值,在酸性条件下加入适量的硫化钠脱除砷。“无污染砷碱渣处理技术”工业试验结果表明:锑和铅的回收率分别达到99.0%和99.6%;砷、碱和硫酸钠的浸出率分别达到90%,99%和100%;碳酸盐中碱含量达到95%,砷含量在1%左右;砷硫化物中砷含量达到37%;在脱砷过程中产生的少量硫化氢采用氢氧化钠溶液吸收,吸收液返回脱砷系统;水溶液闭路循环,无废水外排;锑精矿、碳酸盐返回锑冶炼;砷硫化物、硫酸钡作为产品销售。采用该技术无废气、废水、废渣产生,工艺流程简单,操作条件容易控制,设备投资少。

Abstract: By stirring the mixture of slag of arsenic and soda in smelting antimony at 80℃ for about 2 h, the mixture was filtered so as to remove the antimony. Then the liquid after removing antimony was blown by CO₂in order to remove the carbonic salt. The pH value of the mixture after removing the carbonic salt was adjusted and the appropriate Na₂S was added to the mixture in order to remove the arsenic. The commercial scale test was conducted for anti-pollution treating.The results indicate that the recovery rate of antimony and lead is 99.0% and 99.6%, respectively. The leach rate of arsenic, soda and sodium sulfate is 90%,99% and 100%, respectively. The content of soda in carbonic salt reaches 95% and the content of arsenic is about 1%; the content of arsenic in arsenide sulfur reaches 37%. Sodium hydroxide is used to absorb the little hydrogen sulfide which is produced in the process of removing arsenic,and the absorbing liquid goes back to removing arsenic system. The water solution is closed circularly, and there is no waste water pushing outside.Concentrate antimony and carbonate go back to antimony for smelting,arsenide sulfur and barium sulfate are as products for saling. The waste gas, waste water and waste slag aren′t produced using the technique. The technological process is simple,the handling condition can be easily controlled, and the investment in equipment is small.