聚合氯化铝处理铝土矿选矿回水的试验研究
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摘要
铝土矿选矿回水在生产系统中循环时间的延长,会使脱硅生产指标逐渐恶化;选矿回水的置换外排存在一定的环境污染风险。采用聚合氯化铝(PAC)对选矿回水进行处理,并考察脱硅指标。结果表明,选矿回水在生产系统中循环使用25 d后脱硅指标恶化严重;适量的PAC处理可降低选矿回水中絮凝剂残留,提高精矿铝硅比与精矿氧化铝回收率,延长选矿回水的循环使用时间;过量的PAC添加会造成絮凝剂含量的上升,进而导致脱硅指标再次恶化。
Desilication index decreased with the increase of cycle time of the backwater in bauxite flotation. Discharge of the backwater may lead to the risk of environmental pollution. Polyaluminium chloride(PAC) is used to treat the backwater, and desilication index are examined. The results showed that flotation index that using backwater deteriorate seriously after 25 days. After treatment of backwater by moderate amount of PAC, Al/Si ratio and recovery rate of concentrates are improved and the cycle time of the backwater is increased, which may due to the decrease of the flocculant content. But the overaddition of PAC can't contribute to the desilication index, and probably due to the reincrease of the flocculant content in backwater.
Desilication index decreased with the increase of cycle time of the backwater in bauxite flotation. Discharge of the backwater may lead to the risk of environmental pollution. Polyaluminium chloride(PAC) is used to treat the backwater, and desilication index are examined. The results showed that flotation index that using backwater deteriorate seriously after 25 days. After treatment of backwater by moderate amount of PAC, Al/Si ratio and recovery rate of concentrates are improved and the cycle time of the backwater is increased, which may due to the decrease of the flocculant content. But the overaddition of PAC can't contribute to the desilication index, and probably due to the reincrease of the flocculant content in backwater.
引文
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[2]冯其明,卢毅屏,欧乐明,等.铝土矿的选矿实践[J].金属矿山,2008(10):1-4.
[3]李素敏,郭鑫,田应忠.铝土矿浮选精矿和尾矿沉降性能研究[J].轻金属,2017(2):7-12.
[4]常自勇,冯其明,欧乐明.回水中絮凝剂对铝土矿浮选影响的研究[J].有色金属(选矿部分),2014(6):88-91.
[5]杨茹霞,孙慧芳,张国栋,等.聚合氯化铝靶向混凝去除焦化废水难降解有机物的研究[J].工业用水与废水,2017,48(6):16-21.
[6]RAO D S,DAS B.Characterization and beneficiation studies of a low grade bauxite ore[J].Journal of the Institution of Engineers,2014,95(2):81-93.
[7]何平波,刘晗,陈兴华.铝土矿脱硅浮选尾矿回水对浮选行为的影响[J].有色金属(选矿部分),2011(3):25-28.
[8]LIU G,ZHONG H,HU Y,et al.The role of cationic polyacrylamide in the reverse flotation of diasporic bauxite[J].Minerals Engineering,2007,20(13):1191-1199.
[9]吴得南.HPAM与水处理剂相互作用的研究[D].黑龙江:东北石油大学,2012.
[10]王海洋.含聚采油污水絮凝处理实验研究[J].污染防治技术,2014,27(1):1-4,16.