Abstract—

The goal of the present work was to study the dependence of the rate of copper and zinc bioleaching from an arsenic-containing copper-zinc concentrate containing 16% Cu, 5.3% Zn, and 1.36% As, on the temperature and the presence of an organic carbon source (yeast extract) in the medium. The main minerals of the concentrate were chalcopyrite (CuFeS₂), tennantite (Cu₁₂As₄S₁₃), sphalerite (ZnS), and pyrite (FeS₂). A mixed culture of moderately thermophilic acidophilic microorganisms oxidizing sulfur and ferrous iron, which was used in the work, consisted of the strains Acidithiobacillus caldus MBC-1, Sulfobacillus thermosulfidooxidans SH-1, and Acidiplasma sp. MBA-1. The experiments were carried out in flasks with 100 mL of mineral medium and 2 g of the concentrate on a rotary shaker for 30 days at temperatures from 40 to 60°C. It was shown that the leaching rate of copper depended both on temperature and on the presence of yeast extract. Copper leaching rate increased with increasing temperature, while zinc leaching was less dependent on the temperature. In the presence of an organic carbon source in the medium, both copper and zinc were actively leached at high temperatures (55 and 60°C), while in experiments with a medium without yeast extract, the activity of non-ferrous metals leaching from the concentrate at these temperatures was much lower. At the same time, at temperatures of 40–50°C, leaching activity was less dependent on the presence of the organic carbon source in the medium.

中文翻译：

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高砷含量的铜锌精矿的生物浸出

摘要—

本工作的目的是研究温度为16％的铜，5.3％的Zn和1.36％的As的含砷铜锌精矿中铜和锌生物浸出速率的依赖性。介质中的有机碳源（酵母提取物）。精矿的主要矿物是黄铜矿（CuFeS ₂），钙钛矿（Cu ₁₂ As ₄ S ₁₃），闪锌矿（ZnS）和黄铁矿（FeS ₂）。用于工作的中度嗜热嗜酸性微生物氧化硫和二价铁的混合培养物，由嗜酸酸杆菌硫杆菌MBC-1，嗜热硫磺芽孢杆菌SH-1和酸浆虫sp。MBA-1。实验是在装有100 mL矿物培养基和2 g浓缩物的烧瓶中，在旋转振荡器上在40至60°C的温度下进行30天。结果表明，铜的浸出速率取决于温度和酵母提取物的存在。铜的浸出速率随温度的升高而增加，而锌的浸出对温度的依赖性较小。在培养基中存在有机碳源的情况下，铜和锌都在高温（55和60°C）下被积极浸出，而在没有酵母提取物的培养基中进行实验时，有色金属的活性则从铜中浸出。在这些温度下精矿要低得多。同时，在40–50°C的温度下，浸出活性较少依赖于介质中有机碳源的存在。