富铅锑含砷烟尘中砷的选择性脱除（英文）

Selective removal of As from arsenic-bearing dust rich in Pb and Sb

开展碱性体系选择性脱除富铅锑含砷烟尘中砷的研究,分别考察Na OH浓度、温度、浸出时间、液固比、元素硫对砷、锑、铅溶解的影响。结果表明,砷浸出过程中,元素硫的存在可以有效抑制铅和锑浸出。原料中的Sb2O3、As2O3和Pb5(As O4)3OH转化为NaSb(OH)6和PbS,存在于渣中,砷以砷(Ⅲ)或砷(Ⅴ)离子的形式溶于浸出液中。在最优条件下,砷的浸出效率可达99.84%;97.82%锑和99.97%铅留在渣中,浸出渣中砷的含量低于0.1%。提出一种氢氧化钠体系添加元素硫在选择性脱除含砷烟尘中砷后潜在回收铅、锑的新途径。

The selective removal of arsenic from arsenic-bearing dust containing Pb and Sb in alkaline solution was studied. The influence of Na OH concentration, temperature, leaching time, liquid to solid ratio, and the presence of elemental sulfur on the dissolution of As, Sb and Pb in Na OH solution was investigated. The results indicate that the presence of elemental sulfur can effectively prevent leaching of lead and antimony from arsenic. The Sb2O3, As2O3 and Pb5(AsO4)3 OH in the raw material convert to NaSb(OH)6 and PbS in the leaching residue, while arsenic is leached out as As(Ⅲ) or As(Ⅴ) ions in the leaching solution. Arsenic leaching efficiency of 99.84% can be achieved under the optimized conditions, while 97.82% of Sb and 99.97% of Pb remain in the leach residue with the arsenic concentration of less than 0.1%. A novel route is presented for the selective removal of arsenic and potential recycle of lead and antimony from the arsenic-bearing dust leached by Na OH solutions with the addition of elemental sulfur.