铁硫氧化菌群共同脱除高硫铝土矿中的硫

自高硫铝土矿区选育得到2组铁硫氧化菌群, 用于高硫铝土矿脱硫, 利用正交实验优化铁硫氧化菌群的脱硫条件, 考察了矿石驯化对提高菌群脱硫效率的影响。SEM、XRD分析结果表明: 铁硫氧化菌群可将高硫铝土矿中的含硫矿物氧化, 自矿区酸性矿坑水中富集的菌群氧化能力高于从湿润矿石表面富集的菌群。脱硫过程中生成的沉淀物黄钾铁矾类物质是制约脱硫效率的主要因素。矿石驯化对提高脱硫率有正面作用, 矿石驯化15次后, 12天脱硫率上涨14.31%, 但脱硫率与矿石驯化次数不存在线性关系。

Bio-desulfurization of High-sulfur Bauxite by Indigenous Sulfur- and Iron-oxidizing Moderately Thermophilic Consortia

Two sets of iron- and sulfur-oxidizing consortia were cultivated for researches on bio-desulfurization of high-sulfur bauxite. Then orthogonal tests were conducted to optimize the desulfurization conditions of indigenous consortia and effect of ore domestication on desulphurization rate of the consortia was also investigated. SEM, XRD analysis results indicated that sulfur-containing mineral in the high-sulfur bauxite was oxidized by the iron- and sulfur- oxidizing consortia. It is shown that consortia enriched from acid mine drainage containing sulfur- and iron-oxidizing moderately thermophilic can bring in a more rapid bio-oxidation rate than consortia enriched from wet surface of ores. In the process of desulphurization, the formation of jarosite was the main factor restricting desulfurization rate. Continuous subcultivation and domestication by indigenous ore can positively improve the desulfurization efficiency. The desulfurization rate of 12 days was increased by 14.31% after domestication for 15 times. However, there was not a linear relationship between the desulfurization rate and domestication times.