含铜金精矿热压预氧化—氰化综合回收金铜试验

Comprehensive Recovery of Gold and Copper from Copper-bearing Gold Concentrate by Hot-pressure Oxidation-Cyanidation

对某含铜金精矿进行了热压预氧化—氰化综合回收金铜试验,探讨热压预氧化阶段矿石粒度、时间、温度、氧化分压和液固比对铜浸出率的影响。结果表明,在矿石粒度-44μm占85%、时间2.0h、温度210℃、氧分压0.8 MPa和液固比4∶1的条件下,铜浸出率为98.92%。预氧化渣在矿浆浓度为33%、pH=10~11和氰化钠浓度1‰的条件下浸出24h,金浸出率由常规氰化浸出的48.65%提高到98.41%,氰化钠耗量由常规氰化浸出的33.27kg/t下降至1.67kg/t。实现了金、铜的综合回收。

Comprehensive recovery of gold and copper by hot-pressure oxidation-cyanidation from copperbearing gold concentrate was studied. At the stage of pressure oxidation, the effects of particle size, time, temperature, oxygen pressure, and L/S on leaching rate of copper were investigated. The results show that copper leaching rate is 98.92% under the conditions including particle size of - 44 μm content of 85%, pressure oxidation time of 2 h, temperature of 210 ℃, oxygen pressure of 0.8 MPa, and L/S=4/1. Gold leaching rate rises from 48.65 % of conventional cyanidation leaching to 98.41%, and sodium cyanide consumption drops from 33.27 kg/t of conventional cyanidation leaching to 1.67 kg/t under the conditions including slurry density of 33%, pH value of 10 - 11, sodium cyanide concentrate of 1‰, and leaching time of 24 h. Comprehensive recovery of gold and copper is realized.