摘要
The separation and enrichment of mercury and the recovery of elemental sulfur from flotation sulfur concentrate in zinc pressure leaching process were carried out by sodium sulfide leaching and carbon dioxide precipitating. The results show that the leaching rate of elemental sulfur is more than 98%, and 98.13% of mercury is enriched in the residue, under the optimized conditions of sodium sulfide concentration 1.5 mol/L, liquid/solid ratio 6：1 and leaching time 30 min at room temperature. In addition, the content of mercury is enriched 5.23 times that in the leaching residue. The elemental sulfur is precipitated from leaching solution under conditions of carbon dioxide flow rate 200 mL/min and blowing time 150 min, while solution is stirred adequately. The recovery efficiency of elemental sulfur reaches 97.67%, and the purity of elemental sulfur is 99.75%, meeting the requirements of industrial first-rate product standard according to the national standard of GB/T 2449-2006 （PRC）.
采用Na2S浸出-CO2沉淀法对浮选硫精矿中汞的分离和富集以及元素硫的回收进行研究。结果表明,在常温、Na2S浓度为1.5 mol/L、液固比为6:1、浸出时间为30 min的条件下,元素硫的浸出率可达98%以上,汞的平均富集率为98.13%,渣中汞含量为原矿石的5.23倍。向浸出液中通入CO2气体,充分搅拌溶液,在CO2流量为200 mL/min,通气时间为150 min的条件下,元素硫从溶液中析出,回收率可达到97.67%,获得的元素硫纯度为99.75%,符合GB/T2449—2006工业硫磺一等品标准。
