(1. 中南大学 资源加工与生物工程学院，长沙 410083；2. 山东黄金矿业(莱州)有限公司精炼厂，莱州 261441；3. 山东黄金集团烟台设计研究工程有限公司，烟台 264006)
摘 要: 通过在高砷金精矿中配入不同比例的低砷碳酸盐型金精矿，使其所含硫、砷及铁等主要矿物成分含量发生变化，研究给矿中铁砷摩尔比对难处理高砷金精矿细菌氧化−氰化浸出效果的影响。结果表明：含砷金精矿中铁砷摩尔比直接影响细菌预氧化的效果，同时也影响细菌的活性和溶液中铁砷摩尔比的变化，给矿中铁砷摩尔比越高，溶液中的铁砷摩尔比也越高，且随着给矿中铁砷摩尔比的增加，溶液中铁砷摩尔比的变化幅度加大，给矿中铁砷摩尔比介于4.6~5.2之间，有利于细菌预氧化和氰化浸出，铁、砷氧化率分别由6.14%和7.38%提高到89.90%和93.60%，金、银浸出率分别由64.18%和35.93%提高到97.78%和88.83%，较好地改善细菌氧化效果，稳定和优化细菌预氧化过程。
关键字: 高砷难处理金精矿；细菌氧化；氰化提金
（1. School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China;
2. The Refinery of Shandong Gold Mining Co., Ltd., Laizhou 261441, China;
3. Engineering Design & Research Co. Ltd., Shandong Gold Group, Yantai 264006, China）
Abstract:Through blending low arsenic carbonate gold concentrate with different ratios into high arsenic-containing gold concentrate and changing the content of major ores, such as sulfur, arsenic and iron, the effect of iron-arsenic molar ratio on the bacteria oxidating-cyaniding extraction from high arsenic-containing refractory gold concentrate was investigated. The result shows that the iron-arsenic mole ratio of arsenic-containing gold concentrate has direct effect on the bacteria oxidation, bacteria activity and iron-arsenic molar ratio in solution. High iron-arsenic mole ratio in feeding results in high iron-arsenic ratio in solution. With iron-arsenic molar ratio increasing, the iron-arsenic ratio increases, and the frequency of change accelerates. The iron-arsenic ratio ranging from 4.6 to 5.2 is helpful to bacteria oxidizing-cyaniding extraction, the oxidation ratios of iron and arsenic increase to 89.90% and 93.60% from 6.14% and 7.38%, respectively. The extraction rate of gold and silver increase to 97.78% and 88.83% from 64.18% and 35.93%, respectively. Choosing appropriate iron-arsenic molar ratio can effectively improve the bacterial oxidation, stabilizes and optimize the process of bacterial pre-oxidation.
Key words: high arsenic refractory gold concentrate; bacterial oxidation; cyaniding gold extraction
