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在生物淋溶锰渣的过程中,设置一系列浓度梯度(0～100 mg/L)的离子型表面活性剂SDS(十二烷基硫酸钠)和非离子型表面活性剂PVP(聚乙烯吡咯烷酮),研究两种活性剂对硫杆菌生长和对锰渣中锰的浸出率的影响。结果表明,两种表面活性剂均能有效强化硫杆菌对锰渣的淋溶性能,SDS和PVP的最佳浓度分别为35 mg/L和15 mg/L,在最佳浓度条件下,两者均能显著降低培养液的pH值,提高锰的浸出率,其浸出率分别达到88%和83%,均高于对照组的72%。进一步分析表明,SDS比PVP更能有效提高浸出体系的ORP电位,促进锰的浸出。电镜结果表明,在最佳浓度条件下,SDS比PVP更能有效促进硫杆菌对锰渣表面的侵蚀,降低锰渣的表面粒度,提高锰渣中锰的浸出率。
In bioleaching of manganese residue, a series of ionic surfactant SDS (sodium lauryl sulfate) and nonionic surfactant PVP (polyvinylpyrrolidone) were set up with a concentration gradient (0-100 mg / L) ) To study the effects of the two active agents on the growth of Thiobacillus and the manganese leaching rate in the manganese residue. The results showed that both surfactants could effectively enhance the leaching performance of Thiobacillus thuringiensis to manganese residue. The optimum concentrations of SDS and PVP were 35 mg / L and 15 mg / L, respectively. Under the optimum conditions, Can significantly reduce the pH value of the culture medium, improve the leaching rate of manganese, the leaching rate reached 88% and 83%, respectively, were higher than the control group of 72%. Further analysis showed that SDS could effectively increase the ORP potential of leaching system and promote the leaching of manganese than PVP. Electron microscopy results showed that SDS could effectively promote the erosion of Thiobacillus on the surface of manganese residue and reduce the surface size of manganese residue and improve the leaching rate of manganese in manganese residue under the optimum conditions.