梅山尾矿综合利用与无害化处置研究

Research on Comprehensive Utilization and Harmless Deposition of Meishan Tailings

梅山尾矿粒度细、含铁品位高,由于脱水困难,抑制了其在水泥中的应用。为解决梅山尾矿的堆存问题,结合梅山采选实际,提出梅山尾矿综合利用和无害化处置技术路径,开展了尾矿脱水工艺研究、微细粒级尾矿浓缩固化干堆研究。通过采用长锥旋流器和陶瓷过滤机联合脱水,可获得产率约70%的较粗粒尾矿用于水泥生产。旋流器溢流经超高压无耙浓密机处理,可获得浓度52%以上的膏体。固化剂MA和YX可以较好地固化膏体,固结体3、28 d的抗压强度分别超过0.20、0.70 MPa,且固结体不易泥化,可满足塌陷区的堆存要求。

Iron grade of tailings in Meishan is high and particle is fine. It＇s difficult to dewatering,which limits its application in cement. In order to resolve the problems of tailings deposition,according to Meishan producing mining and mineral processing technology,the experiment of tailings dewatering and fine tailings thickening and solidification research were conducted. By using long cone hydrocyclone and ceramic filter technological process,more than 70% tailings can be used in cement production. Overflow of hydrocyclone processed by super-pressure thickener without rake,stable paste with concentration more than 52% can be obtained. Stabilizer MA and YX can well solidified paste,compressive strength of solidification can reach 0. 20 MPa and 0. 70 MPa after 3 d and 28 d,the solidification is hard to sliming,can satisfy the subsidence storage requirements.