铜陵有色某矿山磁选尾矿连选回收硫试验  

Magnetic Tail Continuous Selection Experimental Research on the Mine of Tongling Nonferrous Metals Group

作　　者：王周和 Wang Zhouhe(Tongling Non-ferrous Metals Group Holding Company Technology Center)

机构地区：[1]铜陵有色金属集团控股公司技术中心,安徽省铜陵市244000

出　　处：《现代矿业》2020年第4期125-129,138,共6页Modern Mining

摘　　要：铜陵有色某矿山为解决铜(含金银)、铁回收后的选硫精矿品质问题,在小型条件试验基础上进行了连选选硫试验.结果表明:①磁选尾矿中金属矿物主要为黄铁矿、磁黄铁矿,黄铁矿、磁黄铁矿的解离度均在90%左右,粒度主要分布在10~60μm;脉石矿物主要是石英,其次为方解石、石榴子石等.②磁黄铁矿可浮性比黄铁矿差,且与易浮脉石矿物可浮性相近,是造成浮选工艺很难获得高品质的硫精矿的原因.根据黄铁矿与磁黄铁矿可浮性差异,以及磁黄铁矿和脉石矿物磁性的差异,采用分步浮选、中矿强磁选、强磁选精矿浮选工艺连选,获得了含硫40.36%、含铁49.25%,全硫+铁品位为89.61%,硫回收率为66.78%的总硫精矿,该精矿经烧酸之后,硫酸烧渣铁品位可达65%,大大提高了硫酸烧渣的附加值.③产品镜下分析表明,磁选尾矿中主要有用矿物为黄铁矿和磁黄铁矿;硫精矿1中金属矿物以黄铁矿为主;精选1尾矿和精选2尾矿中金属矿物主要是磁黄铁矿;硫精矿2中金属矿物以磁黄铁矿为主.这表明分步浮选、中矿强磁选、强磁选精矿浮选工艺是回收磁选尾矿中黄铁矿和磁黄铁矿的合理工艺.④本次连选试验的尾矿2(即强磁选尾矿)含硫较高,达14.53%,以非磁性磁黄铁矿为主,后续应开展该部分含硫矿物的回收研究.In order to solve the quality problem of sulfur concentrate after recycling copper(containing gold and silver)and iron in a mine of Tongling Nonferrous Metals Group Holding Co.,Ltd.On the basis of small scale condition test,continuous sulfur selection test was carried out.The results showed that:①The metal minerals in magnetic separation tailings were mainly pyrite and pyrrhotite,both of which liberation degree was about 90%,and the particle size was mainly distributed in 10~60μm.Gangue minerals were mainly quartz,followed by calcite,garnet and so on.②The floatability of pyrrhotite was worse than that of pyrite and similar to that of easily floating gangue minerals.It was the reason that it was difficult to obtain high quality sulfur concentrate by flotation process.According to the difference in the floatability of pyrite and pyrrhotite,and the difference in the magnetic properties of pyrrhotite and gangue minerals,the flotation processes of step-selection,middlings by high intensity magnetic separation and high intensity magnetic concentrate by flotation process were adopted.The total sulfur concentrate containing sulfur grade 40.36%,iron grade 49.25%,total sulfur+iron grade 89.61%and sulfur recovery 66.78%was obtained.The iron grade of sulfuric acid burn slag can reach 65%after the concentrate is burnt by sulfuric acid,which greatly increases the additional value of sulfuric acid burn slag.③Microscopic analysis of the product shows that,the main useful minerals in magnetic separation tailings are pyrite and pyrrhotite.Pyrite is the main metal mineral in sulfur concentrate 1,and pyrrhotite is the main metal mineral in tailings of first-stage concentation and second-stage concentration.Pyrrhotite is the main metal mineral in sulfur concentrate 2.This shows that the flotation processes of staged flotation,middlings by high intensity magnetic separation and high intensity magnetic concentrate via flotation process are reasonable process for recovering pyrite and pyrrhotite from tailings of magnetic separati

关 键 词：黄铁矿 磁黄铁矿 分步浮选 强磁选+浮选 

分 类 号：TD926.4[矿业工程—选矿] TD924