伊朗某金矿石选矿试验

Experimental Study on Mineral Processing of a Gold Ore in Iran

伊朗某金矿石金品位为7.05 g/t,主要金矿物为裸露及半裸露金,主要载体矿物为黄铁矿,自然金的粒度变化范围很大,细粒明金(0.01~0.06 mm)占81.15%,微粒金占18.85%。为了确定该矿石的高效选矿工艺,进行了选矿试验研究。结果表明:(1)阶段磨矿、阶段选别工艺可以有效减少粗颗粒金在浮选过程中的跑尾,避免金矿物在磨矿中出现过粉碎,同时有利于不均匀细粒载金矿物单体解离。(2)跳汰机对-200目占65%的磨矿产品进行重选,可预先产出部分合格金精矿,充分体现了能收早收、分级分选理念。(3)矿石采用阶段磨矿—跳汰重选—阶段浮选工艺流程处理,可获得金品位为81.43 g/t、金回收率为45.52%的重选精矿,金品位为56.12 g/t、金回收率为44.99%的浮选精矿,综合精矿金品位为66.52 g/t,金回收率为90.51%。(4)金品位为0.74 g/t的重浮流程试验尾矿采用氰化浸出工艺处理,金浸出率达62.16%,最终浸出渣的金品位仅为0.28 g/t。

The grade of a gold ore from Iran was 7.05 g/t. The gold minerals mainly existed in pyrite in the form of exposed and semi-exposed gold. The particle size of natural gold ranged widely,with 81.15% of fine grain gold particles （0.01 0.06 mm） and 18.85% of micro-fine gold particles. In order to determine beneficiation process of the ore,the mineral pro- cessing experiments were carried out. The test results showed that：（1）the process of stage grinding-stage separation can effec- tively reduce the loss of coarse gold particles in flotation process and avoid over-grinding in grinding process, meanwhile it was beneficial to the dissociation of unevenly fine gold-bearing minerals. （2）part of qualified gold concentrate can be recovered by u- sing jigging machine from grinding products with fineness of -200 mesh accounted for 65 % , which fully embodied the concepts of recover early and step separation. （3）the gold gravity concentrate with grade of 81.43 g/t and a recovery of 45.52% ,the gold flotation concentrate with grade of 56.12 g/t and a recovery of 44.99% were obtained separately ,and the comprehensive gold concentrate with grade of 66.52 g/t and a recovery of 90.51% was achieved by the process of stage grinding-jigging gravity- stage flotation. （4）cyanide leaching process was adopted to treat the tailings containing 0.74 g/t of gold, hence the leaching rate could reach 62.16% while the gold grade of final leaching residue was only 0.28 g/t.