不同浓度聚丙烯酰胺对石墨尾矿颗粒团聚体微观结构的影响

Effect of different concentrations of polyacrylamide on micro-structure of graphite tailings particle aggregates

针对石墨尾矿颗粒细小,结构松散的问题,采用聚丙烯酰胺与石墨尾矿颗粒胶结的方法,分析了添加聚丙烯酰胺后石墨尾矿颗粒团聚体大小变化,研究了聚丙烯酰胺浓度变化对石墨尾矿颗粒团聚体稳定性的影响。结果表明:加入质量浓度小于0.1%的聚丙烯酰胺,石墨尾矿颗粒中粒径小于0.25 mm的团聚体数量明显减少,大于0.25 mm的团聚体数量随聚丙烯酰胺质量浓度的增加呈增大趋势,聚丙烯酰胺对提高石墨尾矿颗粒团聚体稳定性有明显效果;当聚丙烯酰胺质量浓度超过0.04%时,随聚丙烯酰胺质量浓度的增加,石墨尾矿颗粒团聚体总孔隙度逐渐变小;当聚丙烯酰胺质量浓度小于0.04%时,团聚体之间有较明显的孔隙结构,可以促进水分入渗,增强石墨尾矿的保水能力;当聚丙烯酰胺质量浓度为0.04%时,团聚体之间的孔隙结构最为明显,最有利于水分入渗。

This paper attempts to address the problem of the fine particles and loose structure of the graphite tailings.The study by using the cementation method of polyacrylamide and graphite tailings particles,consists of analyzing the size change of graphite tailings particles aggregate with polyacrylamide added,and studying the influence of the change of polyacrylamide concentration on the stability of graphite tailings particles aggregate.The results show that adding polyacrylamide with mass concentration less than 0.1%,the number of aggregates with particle size less than 0.25 mm in graphite tailings decreases significantly;the number of large aggregates bigger than 0.25 mm tends to increase with the increase of concentration of polyacrylamide,and polyacrylamide has obvious effect on improving the stability of graphite tailings particles.When the mass concentration of polyacrylamide exceeds 0.04%,the total porosity of graphite tailings particle aggregate gradually decreases with the increase of the mass concentration of polyacrylamide;when the mass concentration of polyacrylamide is less than 0.04%,there is obvious pore structure between the aggregates,promoting water infiltration and enhancing the water retention ability of graphite tailings;when the polyacrylamide mass concentration is 0.04%,the pore structure between the aggregates is most obvious and most favorable for water infiltration.