含铜难处理金矿热压预氧化—氰化综合回收金铜-有色金属（冶炼部分）.DOC

含铜金精矿热压预氧化—氰化综合回收金铜试验 谭希发 （紫金矿业集团股份有限公司，福建上杭 364200） 摘要：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，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-44 μm占85%、时间2.0 h、温度210 ℃、氧分压0.8 MPa和液固比4∶1条件下，铜浸出率为98.92%。预氧化渣在矿浆浓度为33%、pH10~11和氰化钠浓度1‰条件下浸出24 h，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3.27 kg/t下降至1.67 kg/t。实现了金、铜综合回收。 关键词：含铜金精矿；热压预氧化；氰化；综合回收 文献标志码：A 文章编号：1007-7545（2016）11-0000-00 Comprehensive Recovery of Gold and Copper from Copper-bearing Gold Concentrate by Hot-pressure Oxidation-Cyanidation TAN Xi-fa (Zijin Mining Group Co., Ltd, Shanghang 364200, Fujian, China) Abstract：Comprehensive recovery of gold and copper by hot-pressure oxidation-cyanidation from copper-bearing 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. Key words：copper-bearing gold concentrate; hot-pressure oxidation; cyanidation; comprehensive recovery 随着黄金的主要原料。我国难处理黄金矿资源资源利用程度仅为25左右，普遍存在采选水平不高技术有限等的预处理方法主要有氧化焙烧法、热压氧化法生物氧化采用何种预处理技术根据，难处理金矿的一种重要预处理工艺180~225 ℃、1.1~3.2 MPa的条件下，黄铁矿、毒砂和含金贱金属等硫化物被氧化分解，使包裹金暴露出来[5-7]，反应生成的硫酸铁在高温下不稳定，部分硫酸铁发生水解，生成氧化铁、碱式硫酸铁或水合氢黄钾铁矾形式沉淀[7-8]。在高温条件下，有Fe3+存在时，绝大部分砷以较稳定的结晶状砷酸铁或者臭葱石（FeAsO4·H2O）形式沉淀[8-9]。 2 矿石性质 试验所用某浮选铜金精矿，粒度为μm占Cu 9.13、As 1.78、TS 30.02、TFe 28.82、TC 2.34、SiO2 8.56、CaO 5.96、MgO 4.82、Al2O3 0.50、Na2O 0.04、K2O 0.06。1979-），男，土家族，贵州思南人，硕士研究生，高级工程师. 3 热压预氧化—氰化提金试验结果