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为探明金属硫化矿细菌脱硫的影响因素与作用机理,采用嗜酸细菌进行柱浸实验。实验方案采用均匀设计法,分析了溶液初始pH值、布液强度和矿石平均粒径3个因素对脱硫效果的影响。脱硫实验结果表明,布液强度对矿石脱硫率的影响最大,矿石粒径次之,pH值最小。对脱硫率进行回归分析,结果表明,布液强度、pH值与脱硫率为正相关,矿石粒径与脱硫率为负相关,脱硫率预测最大值可达到19.66%。此外,电镜扫描显示,细菌脱硫作用使矿石表面由致密变为疏松,矿石表面的硫含量由43%左右降低至15%左右,表面脱硫率为65%,矿石的可燃性降低。
In order to explore the influencing factors and mechanism of desulfurization of metal sulfide minerals, column elution experiments were conducted using eosinophilic bacteria. The experimental design adopts the uniform design method to analyze the influence of the three factors of initial solution pH, fabric strength and ore average particle size on the desulfurization effect. Desulfurization results show that the fabric strength of the ore desulfurization rate of the greatest impact, followed by the ore size, pH minimum. Regression analysis of the desulfurization rate shows that there is a positive correlation between fabric strength and pH value and the desulfurization rate. The ore size is negatively correlated with the desulfurization rate, and the maximum value of the desulfurization rate can reach 19.66%. In addition, scanning electron microscopy showed that bacterial desulfurization changed the ore surface from dense to loose, and the sulfur content on the ore surface decreased from about 43% to about 15%. The surface desulfurization rate was 65% and the flammability of the ore decreased.