提高某低品位金矿入堆粒度的可行性研究

Feasibility Study on Improving the Heap Particle Size of a Low Grade Gold Ore

某低品位金矿采用旋回破碎-圆锥破碎-堆浸工艺提金,采用矿物粒级筛析和柱浸模拟实验,对取消圆锥破碎的可行性进行了研究,结果表明,经圆锥破碎后,大粒级矿物量减少,更多的金分布到粒级小于50 mm的矿物中;柱浸实验显示,粒级小于50 mm的矿物金浸出率更高,圆锥破碎后金的浸出率提高1.4%;综合堆浸生产和柱浸实验尾矿的筛析结果估算,取消圆锥破碎工段可节约135.73万元成本,但导致产出减值超过1300万元,矿山宜保留圆锥破碎工序。

Gold was extracted from a low-grade gold ore using gyratory crushing-cone crushing-heap leaching processes.The feasibility of eliminating cone crushing was studied by mineral particle size sieve analysis and column leaching simulation experiment.The results showed that after cone crushing,the amount of large-grain mineral was reduced,and that more gold was distributed to minerals with a size of less than 50 mm.The column leaching experiments showed that the gold leaching rate was higher when the particle size was less than 50 mm,and that it increased by 1.4%after cone crushing.Based on the results of the column leaching experiment and the screening analysis of the heap leaching tailings,the cost of eliminating the cone crushing section can be saved by 1.3573 million yuan,but the output impairment is more than 13 million yuan,so the mine should retain the cone crushing process.