硫酸渣生物脱硫制备高品位铁精矿试验研究  

Preparation of High Quality Iron Concentrate from Pyrite Cinder by Desulfurization

作　　者：左豪恩 崔兴兰 温建康[1] 罗毅 Zuo Haoen;Cui Xinglan;Wen Jiankang;Luo Yi(National Engineering Laboratory of Biohydrometallury, General Research Institute for Nonferrous Metals, Beijing 100088, China)

机构地区：[1]北京有色金属研究总院生物冶金国家工程实验室

出　　处：《稀有金属》2018年第8期869-877,共9页Chinese Journal of Rare Metals

基　　金：国家科技支撑计划课题(2015BAB12B03)资助

摘　　要：通过Sulfobacillus thermotolerans，Leptosirillum ferriphilum，Lerroplasma acidiphilum混合菌对德尔尼铜、锌焙烧渣进行生物脱硫制备高品位铁精矿研究，并分析了生物脱硫协同回收铜、锌有价金属的机制。结果表明：细菌在9K培养基中的最佳培养条件为pH值1．2，温度45℃，细菌的浓度可达7．0×10^7cell·ml^-1，Fe^2＋氧化率可达97．78％。硫酸渣生物脱硫协同回收铜、锌的最佳试验条件为pH值1．2，温度45℃，硫酸渣粒度-0．038mm，菌液接种量10％；浸渣中铁、铜、锌、硫含量分别为70．38％，0．14％，0．09％和0．396％；此条件下硫的脱除率可达82．93％，Cu^2＋和Zn^2＋浸出率分别可达80．02％和99．99％。浸渣分析结果表明：生物浸出后渣中铜、硫物相中的硫化物脱除率分别可达78．34％和94．60％，生物浸出后铁含量上升，铜、锌、硫含量大大降低，细菌对于大部分硫化矿都能较好的氧化，且在此酸度条件下铜、锌氧化矿物都能较好的溶解。最终所得的浸渣符合工业上制备高品位铁精矿的要求，这为硫酸渣提纯并回收金属提供一种思路，可取得明显的经济效益、环境效益与社会效益。Preparation of high quality iron concentrate from pyrite cinder by desulfurization from roasting slag generated in Deerni was carried out by mixed bacteria of Sulfobacillus thermotolerans, Leptosirillumferriphilum and Lerroplasma acidiphilum, and the mechanism of synergistic recovery of copper and zinc by biodesulfurization was analyzed. The results showed that the optimal culture conditions of bacteria in 9K medium were pH of 1.2, temperature of 45 9C , the concentration of 7.0×10^7 cell.ml^-1 , and the Fe^2＋ oxidation rate of 97.78%. The best conditions of synergistic recovery of copper and zinc by biodesulfurization were as follows, pH value of 1.2, temper- ature of 45 ℃, particle size of -0. 038 mm and inoculum size of 10%. The content in leaching residue was 70.38% for iron, 0.14% for copper, and 0. 09% for zinc, 0. 396% for sulfur. In the optimum parameters mentioned above, the desulfurization rate of 82.93% , copper leaching rate of 80.02% and zinc leaching rate of 99.99% were achieved from pyrite cinder. The removal rate of the occurrence state of copper and zinc in sulfides was 78.34% and 94.60%, the iron content increased and the content of copper zinc and sulfur decreased greatly after bioleaching. Bacteria could be oxidized well for most sulfide ores, and copper and zinc oxidized min- erals could be dissolved well under this acidity condition. Industrial production of high grade iron concentrate could be well satisfied from bioleaehing residue. A good method for the purification of pyrite circler and recovery of metal couldbe achieved, which couldget significant economic, environmental and social benefits.

关 键 词：硫酸渣 铁精矿 生物浸出 脱硫 浸出率 

分 类 号：TK91[动力工程及工程热物理]