(1. 中南大學(xué) 資源加工與生物工程學(xué)院，長(zhǎng)沙 410083；2. 山東黃金礦業(yè)(萊州)有限公司精煉廠，萊州 261441；3. 山東黃金集團(tuán)煙臺(tái)設(shè)計(jì)研究工程有限公司，煙臺(tái) 264006)
摘 要: 通過(guò)在高砷金精礦中配入不同比例的低砷碳酸鹽型金精礦，使其所含硫、砷及鐵等主要礦物成分含量發(fā)生變化，研究給礦中鐵砷摩爾比對(duì)難處理高砷金精礦細(xì)菌氧化−氰化浸出效果的影響。結(jié)果表明：含砷金精礦中鐵砷摩爾比直接影響細(xì)菌預(yù)氧化的效果，同時(shí)也影響細(xì)菌的活性和溶液中鐵砷摩爾比的變化，給礦中鐵砷摩爾比越高，溶液中的鐵砷摩爾比也越高，且隨著給礦中鐵砷摩爾比的增加，溶液中鐵砷摩爾比的變化幅度加大，給礦中鐵砷摩爾比介于4.6~5.2之間，有利于細(xì)菌預(yù)氧化和氰化浸出，鐵、砷氧化率分別由6.14%和7.38%提高到89.90%和93.60%，金、銀浸出率分別由64.18%和35.93%提高到97.78%和88.83%，較好地改善細(xì)菌氧化效果，穩(wěn)定和優(yōu)化細(xì)菌預(yù)氧化過(guò)程。
關(guān)鍵字: 高砷難處理金精礦；細(xì)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
