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为研究硫氧化细菌对硫化锑矿尾矿中重金属污染释放的影响,从贵州某锑矿的酸性矿井废水中分离出硫氧化细菌,分离纯化后对其生长特性进行初步研究,以温度、pH、与矿浆浓度为3种因素,每种因素选择3种不同水平进行正交试验设计,探讨不同条件下硫氧化细菌的浸矿影响。结果表明,随着时间变化,硫氧化细菌不断生长,各实验组溶液pH呈下降趋势、EC(电导率)呈上升趋势、目标重金属离子浓度呈上升趋势,且在pH=3、t=25℃、矿浆浓度c=20%时浸出量达到最大。表明硫氧化细菌的存在促进了锑矿尾矿中重金属的溶出,在自然堆存条件下会加剧矿区的环境污染,应加以及时有效控制。
In order to study the effect of sulfur-oxidizing bacteria on the release of heavy metal pollution from the tailings of antimony sulfide ore, the sulfur-oxidizing bacteria were isolated from the acidic mine wastewater of an antimony mine in Guizhou. The characteristics of the sulfur- And pulp concentration of three kinds of factors, each factor selected three different levels of orthogonal experimental design to explore the impact of different conditions, the leaching of sulfur bacteria. The results showed that with the change of time, the growth of sulfur-oxidizing bacteria continued, and the pH of solution in each experimental group showed a downward trend. The EC (conductivity) showed an upward trend. The target heavy metal ion concentration showed an upward trend. At pH = 3, t = 25 ℃ , Pulp concentration c = 20% when the amount of leaching reached the maximum. The results showed that the existence of sulfur-oxidizing bacteria promoted the dissolution of heavy metals in the tailing of antimony ore, which would exacerbate the environmental pollution in the mining area under the conditions of natural storage and should be effectively controlled in time.