摘要
含砷烟尘经氢氧化钠溶液浸出、SO2还原制备得到As2O3。研究结果表明:当氢氧化钠浓度为3.0 mol/L、硫磺与含砷烟尘质量比0.075:1、液固比6:1、浸出温度95℃、浸出时间2.0 h、搅拌速度400 r/min时,砷浸出率为99.27%。当初始砷浓度为100 g/L、初始pH=0、反应温度30℃、反应时间90 min、SO2气体流量0.8 L/(L·min)、搅拌速度300 r/min时,砷回收率为86.13%,得到的产物中As2O3含量为95.79%。经热水溶解-重结晶,As2O3纯度达99.63%,质量达到了有色金属行业标准(YS-T99-1997)中As2O3-1标准。
Arsenic trioxide was prepared from arsenic-bearing dust through leaching with NaOH solution and reduction with sulfur dioxide.The results show that arsenic leaching rate is 99.27%under the conditions including concentration of NaOH solution of 3.0 mol/L,mass ratio of sulfur to arsenic-bearing dust of 0.075︰1,L/S of 6︰1,leaching time of 2.0 h,leaching temperature of 95℃,and agitation speed of 400 r/min.As2O3 content in reduction product is 95.79%with arsenic recovery of 86.13%under the conditions including initial concentration of arsenic of 100 g/L,initial pH value of 0,reaction temperature of 30℃,reaction time of 90 min,flow rate of SO2 of 0.8 L/(L?min),and agitation speed of 300 r/min.After dissolving in hot water and recrystallization,As2O3 purity is 99.63%,which meets the first grade standard of Nonferrous Metal Industry of China(YS-T99—1997).
作者
易宇
叶逢春
王红军
YI Yu;YE Feng-chun;WANG Hong-jun(Jiangxi Huagan Nerin Precious Metals Technology Co.,Ltd.,Yichun 331100,Jiangxi,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2020年第9期59-63,共5页
Nonferrous Metals（Extractive Metallurgy)
基金
国家重点研发计划项目(2018YFC1902503)。
关键词
含砷烟尘
碱浸
结晶
还原
三氧化二砷
arsenic-bearing dust
alkaline leaching
crystallization
reduction
arsenic trioxide
作者简介
易宇(1982-),男,湖南岳阳人,博士,工程师。
