安徽某黄铁矿与磁黄铁矿分步回收试验研究

The Experimental Research on Pyrite and Pyrrhotite Step Recovery in Anhui

安徽某矿山含硫矿物以黄铁矿和磁黄铁矿为主,其中黄铁矿可浮性较好,磁黄铁矿可浮性相对较差,在浮选过程中容易氧化、掉槽,且磁黄铁矿与脉石矿物可浮性相近,采用浮选工艺很难获得高品质的硫精矿。根据黄铁矿和磁黄铁矿之间的可浮性差异、及磁黄铁矿具有弱磁性的性质特点,采用分步浮选工艺,优先回收可浮性较好的黄铁矿,以强磁+浮选工艺回收可浮性相对较差的磁黄铁矿,实现了对黄铁矿和磁黄铁矿的综合回收。闭路试验获得了以黄铁矿为,主硫品位为47.78%、铁含量为43.83%,硫回收率为57.11%的硫精矿1;以磁黄铁矿为主,硫品位为36.40%、铁含量为55.60%,硫回收率为22.12%的硫精矿2;总硫精矿硫品位为43.94%、铁含量为47.80%,其中全硫+铁品位为91.74%,硫回收率为79.23%。总硫精矿经烧酸后,硫酸烧渣中铁品位在65%以上,附加值大大提高,具有广泛的经济效益和社会效益。

Pyrite and pyrrhotite are the main sulfur-containing minerals in a mine in Anhui province,of which pyrite has good flotability and pyrrhotite has relatively poor flotability,which is easy to be oxidized and fall off the cell in the flotation process,and the flotability of pyrrhotine is similar to that of gangue minerals,so it is difficult to obtain high-quality sulfur concentrate by flotation process.According to the difference of flotability between pyrite and pyrrhotite and the weak magnetism of pyrrhotite,the fractional flotation process was adopted to recover pyrite with better flotability preferentially,and the high intensity magnetic separation+flotation process was used to recover pyrrhotite with relatively poor flotability,thus realizing the comprehensive recovery of pyrite and pyrrhotite.A pyrite concentrate with sulfur grade of 47.78%,iron content of 43.83%and sulfur recovery of 57.11%and a pyrrhotite concentrate with sulfur grade of 36.40%,iron content of 55.60%,sulfur recovery of 22.12%was obtained in the closed-circuit test.Sulfur grade of total sulfur concentrate is 43.94%,iron content is 47.80%,the total grade of sulfur and iron is 91.74%,and the sulfur recovery is 79.23%.After sulphuric acid treatment,the grade of iron in the pyrite cinder is more than 65%,the added value is greatly improved and the method has wide economic and social benefits.