处理难选金矿石的试验研究

THE TEST STUDY OF BENEFICIATION REFRACTORY GOLD ORES

某仓砷难选金矿石的工艺矿物学研究表明，金矿物有４２．３％以次显微不可见金包裹于毒砂与黄铁矿中，其余以显微可见金分布于脉石矿物粒间。显微可见金的载体主要是绢云母等硬度较低的脉石矿物，且金的粒度极细，９０．５４％小于１０μｐ。针对其矿石性质，采用泥砂分选，粗砂浮选，细泥氰化提金联合流程，获得了金总回收率９２．０６％的较高指标，其中近４０％可实现就地产金。细泥氰化作业回收率达９６．２８％。获得的金精矿品位为Ａｕ３７．５６ｇ／ｔ，Ａｓ４．５％，Ｓ１７．６９％，金回收率５１．７％。该工艺流程结构简单，指标稳定，投资少，效益高，既可实现部分就地产金，又可生产合格金精矿，为难选金矿石的处理找到了一条新途径。

Technological mineralogy study of certain arsenic refractory goldores indicates, that there are 42. 3 % gold minerals being included in arsenopyrite andpyrite as submicroscopic invisible gold, the others exist in gangue as microscopic visiblegold. The carrier of microscopic visible gold is mostly gangue minerals which is lowhardness, such as sericite, the size of gold is very fine, with 90. 54 % less than 10pm.According to ore properties, using separation of slime and sand, flotation of coarseparticle, slime cygnidation as combined process, gained high gold recovery rate up to92.06%, of which about 40% gold can be producted in site. The gold recovery inslime cyanidation stage is 96. 08%. The gold grade of concentrate is 37. 56g/t, witharsenic at 4. 5 %, sulphur at 17. 69 %, gold recovery is 51. 7%. This process is simple,with stable performance results, less investment, high benefit, not only can producegold in site, but also produce quantified gold concentrate. This combined process findsthe new solution to refractory gold ores.