高砷硫铁矿高效分离硫砷

Efficient separation of arsenic and sulfur from iron sulfide minerals containing arsenic

云南某选矿厂铜硫分离后的陶瓷过滤机尾矿为高砷硫铁矿。化学分析表明,矿样中含硫27.32%,有毒元素砷含量高达4.85%。X射线衍射、电子探针和能谱分析表明,矿样中主要硫化矿物为黄铁矿,其次为磁黄铁矿和毒砂,主要脉石矿物为白云石、石英等,黄铁矿和毒砂基本单体解离。根据高砷硫铁矿性质,采取“先浮后磁”的工艺对高砷硫铁矿进行选别,以大分子有机弱酸盐为主的高效药剂(YX-SY1)作为毒砂的抑制剂,通过“浮硫抑砷”的浮选流程分离黄铁矿与毒砂,得到的浮选精矿硫品位为48.11%、硫回收率为42.94%、含砷0.35%;然后根据磁黄铁矿具有磁性这一性质将浮选尾矿给入高梯度磁选机进行选别,得到硫品位37.59%、硫回收率25.32%、含砷0.58%的磁选精矿,而磁选尾矿硫品位为15.66%、含砷7.89%,其中砷的回收率高达95.79%,实现了高砷硫铁矿中硫砷元素的高效分离。

The ceramic filter tailings from a copper sulfur separation plant in Yunnan are high arsenic pyrite.Chemical analysis shows that the sulfur content in the ore sample is 27.32%and the toxic element arsenic content is as high as 4.85%.X-ray diffraction,electron probe analysis and energy spectrum analysis indicate that the main sulfide mineral in the ore sample is pyrite,followed by pyrrhotite and arsenopyrite.The main gangue minerals are dolomite,quartz,etc.,and pyrite and arsenopyrite are basically dissociated.Based on the properties of high arsenic pyrite,a process of“first flotation followed by magnetization”is adopted for the separation of high arsenic pyrite.High efficiency agents mainly composed of macromolecular organic weak acid salts are used as inhibitors of arsenopyrite.The flotation process of“floating sulfur to suppress arsenic”is used to separate pyrite and arsenopyrite,resulting in a flotation concentrate sulfur grade of 48.11%,sulfur recovery rate of 42.94%,and arsenic content of 0.35%.Based on the magnetic properties of pyrrhotite,the flotation tailings are fed into a high gradient magnetic separator for separation,resulting in a magnetic separation concentrate with a sulfur grade of 37.59%,a sulfur recovery rate of 25.32%,and an arsenic content of 0.58%.The magnetic separation tailings have a sulfur grade of 15.66%,an arsenic content of 7.89%,and an arsenic recovery rate of 95.79%,achieving efficient separation of sulfur and arsenic elements in high arsenic pyrite.