采用硫化砷渣制备三氧化二砷工艺  

Preparation of arsenic trioxide from arsenic sulfide slag

作　　者：郑雅杰[1] 刘万宇[1] 白猛[1] 张传福[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2008年第6期1157-1163,共7页Journal of Central South University:Science and Technology

基　　金：广东省创新基金资助项目(200501045)

摘　　要：硫化砷渣经氢氧化钠溶液浸出、空气氧化脱硫和SO2还原制备得到As2O3。研究结果表明:当NaOH与As2S3物质的量比为7.2:1,固体质量与液体体积之比为1:6,反应温度为90℃,反应时间为2h,转速为300r/min时,用氢氧化钠溶液浸取硫化砷渣,其砷的浸取率达到95.90%;过滤后在碱浸液中通空气脱除碱浸液中Na3AsS3中的硫;当反应时间为10h,反应温度为30℃,空气流量为120L/h,对苯二酚和高锰酸钾质量浓度分别为1.5g/L和0.5g/L,木质素磺酸钠质量浓度为0.13g/L时,脱硫率可达到96.00%;当pH值为0,反应时间为1h,反应温度为30℃,砷质量浓度为60.00g/L时通入SO2还原溶液中AsO43-,产物中As2O3含量和砷回收率分别达到92.14%和95.21%;稀硫酸洗涤后,As2O3纯度达95.14%。Arsenic trioxide was prepared by leaching arsenic sulfide slag in NaOH solution, oxidating with air and reducing with sulfur dioxide. The results show that arsenic sulfide slag is leached by sodium hydroxide solution and the leaching rate of arsenic is 95.90% when the molar ratio of NaOH/As2S3 is 7.2：1, the ratio of mass of solid to volume of liquid is 1：6, reaction temperature is 90 ℃, reaction time is 2 h, and agitation speed is 300 r/min. After filtration, the sulphur of Na3AsS3 is removed by blowing air into the alkali leaching solution. The removal rate of sulphur is 96.00%, when reaction time is 10 h, reaction temperature is 30 ℃, ventilation flux is 120 L/h, hydroquinone is 1.5 g/L, potassium permanganate is 0.5 g/L and lignin is 0.13 g/L. When pH value is 0, reaction time is 1 h, reaction temperature is 30 ℃, the concentration of As is 60 g/L, arsenic trioxide content of the product and recycling rate of As are 92.14% and 95.21%, respectively, after AsO4^3- in the solution is reduced by SO2. After washing in dilute sulphuric acid, the purity of As2O3 is 95.14%.

关 键 词：硫化砷渣 碱浸 氧化 还原 三氧化二砷 

分 类 号：TF09[冶金工程—冶金物理化学]