Research On The Bioleaching Process Optimization Of Lead-zinc Sulfide Ore Tailing

Beneficiation process produces a large amount of tailings slag. Tailings contain a lot of valuable metals, and it is a kind of available renewable resources. Metal sulfide ore tailings sulfur content is higher, and sulfur can be used as eosinophilic can nutritional microbial growth of nutrition, thus in order to achieve the biological leaching of sulfide ore tailings. Biological leaching of lead and zinc sulfide ore tailings, not only can recovery of lead and zinc tailings, realize the comprehensive utilization of resources, but also reduce the release of heavy metals in mine tail waste pollution of water environment and soil, economic and environmental significance.The research including that eosinophilic nutritional screening of microorganisms, lead and zinc sulfide ore tailings composition analysis, leaching conditions on sulfide ore tailings of lead and zinc leaching rate and a single sulfide (lead sulfide and zinc sulfide) biological leaching rule.First of all, screen the eosinophilic nutrient microorganisms from a sulphur lead-zinc mine tailings tailings of pit water. Biological leaching tailings samples taken from a sulphur lead-zinc mine tailings. The mineral sample composition analysis shows that, Sulfur, iron content is very high, and mainly in S2- and Fe2+ form, providing the eosinophilic change to nutritional microbes living conditions.Secondly, evaluated the influence of the different acid (HCl, H2SO4, HNO3) in the tailings biological leaching rate of Pb and Zn. The results show that different acid effect on Pb leaching from high to low as HCl>HNO3>H2SO4, and the Zn leaching effect from high to low as H2SO4>HCl>HNO3. This may be related to acid radical anion and Pb2+ and Zn2+ concentration generated compound product size and related effects on tailings biological growth.Then, using HCl as under the condition of adding acid, investigated the influence of pulp quality of solid liquid ratio, initial pH value, pulp quantity of microorganisms on Pb and Zn leaching rate.The results show that:The greater the solid liquid ratio, the greater the peak Pb leaching rate, then rate of Pb peak of the later time; The greater the solid-liquid ratio, the peak is smaller, the leaching rate of Zn peak of the late time; The smaller the initial pH value, the leaching rate of Pb, the greater the peak; When the pulp initial pH value is less than 2.4 is greater than 1.2, provides the acidity to adapt to the environment, the leaching rate of Pb, peak value by more than 60% up to 60%, significantly higher; Initial pH value between 1.2 to 2.0, zinc leaching rate peak changed little; Pulp initial pH from 2.0 to 2.0, the zinc leaching rate peak decreased; The quantity of microorganisms of between 2% and 5% Pb, zinc leaching rate peak changed little; The quantity of microorganisms from 5%to 10%, the Pb and Zn leaching rate increased peak, The quantity of microorganisms from 10% to 10%, the Pb and Zn leaching rate peak changed little.Finally, with the galena and sphalerite as the research object, simulate the actual lead and zinc sulfide minerals in the tailings, studying the biological leaching galena and sphalerite, inspectioning adding Fe2+ of eosinophilic nutritional type microbial leaching galena and sphalerite.The results show that, leaching of Pb, Zn on galena and sphalerite leaching, adding eosinophilic nutrient microorganisms with acid is more advantageous than none; adding eosinophilic nutritional microbial, adding the Fe2+ is more advantageousthan not add Fe2+.