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通过Sulfobacillusthermotolerans、Leptosirillumferriphilum、Lerroplasmaacidiphilum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7.0×107 cell·mL-1,Fe2+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%,Cu2+和Zn2+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。
The biodegradation of Delni copper and zinc roasted slag by high performance iron concentrate was studied by using Sulfobacillusthermotolerans, Leptosirillum ferriphilum and Lerroplasmaacidiphilum. The mechanism of synergistic recovery of copper and zinc valence metals by biodesulfurization was analyzed. The results showed that the optimal culture conditions of bacteria in 9K medium were pH 1.2, temperature 45 ℃, bacterial concentration 7.0 × 107 cell · mL-1 and the oxidation rate of Fe2 + up to 97.78%. Sulfuric acid residue biological desulfurization synergistic recovery of copper, zinc, the best experimental conditions of pH 1.2, temperature 45 ℃, the particle size of sulfuric acid -0.038mm, 10% inoculum capacity; leaching residue of iron, copper, zinc and sulfur were 70.38 %, 0.14%, 0.09% and 0.396%, respectively. Under this condition, the removal rate of sulfur up to 82.93% and Cu2 + and Zn2 + up to 80.02% and 99.99% respectively. The results of leaching analysis showed that the removal rates of sulfide in the copper and sulfur phases of the slag after leaching were up to 78.34% and 94.60%, respectively. The content of iron increased after bioleaching and the content of copper, zinc and sulfur decreased greatly. Most sulphide ore can be better oxidized, and in this condition, copper and zinc oxide minerals can dissolve well. The resulting leached residue meets the requirements of industrial preparation of high-grade iron concentrates. This provides an idea for purifying and recovering metal from sulfuric acid residues, and achieves obvious economic, environmental and social benefits.