Differences of cyanide leaching between calcine and dust from refractory gold concentrates  

难冶金精矿焙砂和烟尘氰化浸金的差异

作　　者：Pan CAO Shang-hua ZHANG Ya-jie ZHENG Han-bing HE Shen-zhi LAI Xing-jun WANG Bing TAN 曹攀;张霜华;郑雅杰;河汉兵;赖慎志;王行军;谭兵(中南大学冶金与环境学院,长沙410083;西部黄金伊犁有限责任公司,伊宁835100)

机构地区：[1]School of Metallurgy and Environment,Central South University,Changsha 410083,China [2]Western Region Gold Yili Co.,Ltd.,Yining 835100,China

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第7期1964-1979,共16页中国有色金属学报（英文版）

基　　金：Project(201552)supported by the Special Project on the Strategic Emerging Industries of Xinjiang Uygur Autonomous Region,China;Project(2017SK2254)supported by the Key Research and Development Project of Hunan Province,China。

摘　　要：Differences of cyanide leaching between the calcine and the dust from a refractory gold concentrate were investigated by comparative method. Results showed that gold leaching efficiencies of the calcine and the dust were 85.31% and 54.30%, respectively, with direct cyanidation. Contents and existing forms of arsenic and carbon were the main reasons for those differences. The maximum gold leaching efficiencies of the calcine and the dust were 87.70% and 58.60%, respectively, with cyanidation after NaOH pre-leaching. Harmful elements removal, gold loss in NaOH pre-leaching and iron oxides hindrance codetermined gold leaching efficiencies of the calcine and the dust. After H2SO4 pre-leaching, the maximum gold leaching efficiencies of the calcine and the dust achieved 94.96% and 80.40%, respectively. The effect of carbonaceous matter was the main reason for differences for leaching efficiencies of the calcine and the dust. Based on those differences, two proper gold extraction processes were put forward, and gold leaching efficiencies for the calcine and the dust achieved 94.91% and 91.90%, respectively.采用对比方法研究难冶金精矿焙砂和烟尘氰化浸金的差异。结果表明,直接氰化时焙砂和烟尘中金的浸出率分别为85.31%和54.30%。砷、碳含量及其存在形式是导致两者金浸出率差异的主要原因。对于NaOH预处理后氰化浸金,焙砂和烟尘中金的最大浸出率分别为87.70%和58.60%。有害元素的脱除、碱浸预处理过程中金的损失及铁氧化物的阻碍共同决定碱浸预处理后焙砂和烟尘中金的浸出率。经H2SO4预处理后,焙砂和烟尘中金的最大浸出率分别达到94.96%和80.40%。碳质物的影响是焙砂和烟尘中金浸出率差异的主要原因。基于这些差异,提出两种适宜工艺,焙砂和烟尘中金的浸出率分别达到94.91%和91.90%。

关 键 词：refractory gold concentrate CALCINE DUST CYANIDATION carbonaceous matter 

分 类 号：TF831[冶金工程—有色金属冶金]