细粒煤泥对粗粒煤泥浮选的抑制机理研究

发布时间：2018-06-08 15:44

本文选题：细粒煤泥 + 粗粒煤泥　；参考：《煤炭工程》2016年08期

【摘要】：通过实验室浮选试验和理论分析,对细粒煤泥(-0.074mm)抑制粗粒煤泥(+0.074mm)浮选的机理进行了探讨。结果表明:粗粒煤泥单独浮选时具有很高的浮选产率,与细粒煤泥混合浮选时(细粒煤泥含量为27.82%),粗粒煤泥产率降低65.69%,与高岭土混合浮选时(高岭土含量27.82%),粗粒煤泥的产率不受影响;粗粒煤泥的产率随着捕收剂的增加而增大,继续增加捕收剂用量,产率变化缓慢;浮选矿浆中六偏磷酸钠的添加量为2500g/t时,粗粒煤泥产率提高18.86%,六偏磷酸钠通过降低细粒煤泥与粗粒煤泥间的作用力改善粗粒煤泥的浮选;通过偏反光显微镜观察到细粒煤泥颗粒主要是煤和矿物杂质的伴生体,兼具亲水性和疏水性表面;根据扩展DLVO理论分析得出细粒煤泥罩盖使得粗粒煤泥的疏水表面减少,抑制了粗粒煤泥的浮选。
[Abstract]:The mechanism of inhibition of coarse coal slime (0.074 mm) flotation by fine coal slime (0.074 mm) was discussed by laboratory flotation test and theoretical analysis. The results show that the production rate of coarse coal slime is very high when it is floated separately. When mixed flotation with fine coal slime (the content of fine coal slime is 27.82), the yield of coarse coal slime decreases 65.69, and when mixed with kaolin (the content of kaolin is 27.82), the yield of coarse coal slime is not affected, and the yield of coarse coal slime increases with the increase of collector. When the addition of sodium hexametaphosphate in flotation slurry is 2500g/t, the yield of coarse coal slime increases by 18.86, and sodium hexametaphosphate improves the flotation of coarse coal slime by reducing the interaction force between fine coal slime and coarse coal slime. The fine coal slime particles are mainly associated with coal and mineral impurities, and have hydrophilic and hydrophobic surfaces, according to the analysis of extended DLVO theory, it is found that fine coal slime cover can reduce the hydrophobic surface of coarse coal slime. The flotation of coarse coal slime is restrained.
【作者单位】：中国矿业大学(北京)化学与环境工程学院;
【基金】：国家自然科学基金(51504262)
【分类号】：TD94

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