基于生石灰强化处理的锰渣无害化技术

Harmless Treatment Technology of Manganese Slag Based on Quicklime

以酸浸锰渣为对象,生石灰为添加剂,翻转浸出法提取锰渣浸出液,分析了浸出液中的污染物类型及浓度,研究了生石灰添加量、锰渣含水率、预反应时间等对锰渣无害化处理的影响及最优条件。结果表明,锰渣中的主要污染物为锰和氨氮,且浓度严重超标。生石灰的水化反应形成了良好的碱性环境,以物理包裹、吸附及沉淀作用,起到了很好的无害化处理效果。最优的处理条件为:生石灰添加量10%、锰渣含水率27%、预搅拌时间40 min、预静置时间72h,锰渣浸出液中可溶性锰浓度为2.60mg/L,锰脱除率达99.8%,NH_4^+-N浓度为19.53mg/L,脱除率为97.0%。

Manganese slag was leached by way of overturn with quicklime as additive.Types and concentration of pollutants in lixivium were analyzed.Effects of additive amount of quicklime,moisture content of manganese slag,and pre-reaction time on harmless treatment were analyzed.The results show that water-soluble Mn^（2＋）and NH4^＋-N are key pollutants with excessive concentration.Quicklime has hydration reaction with water to form good alkaline environment.Hydration reaction realizes good harmless treatment effect by physical inclusion,adsorption,and precipitation.Concentration of watersoluble Mn^2＋and NH4^＋-N is 2.60mg/L and 19.53mg/L respectively with removal ratio of manganese and NH4^＋-N of 99.8% and 97.0% respectively under the optimum conditions including additive amount of quicklime of 10%,moisture content of manganese slag of 27%,pre-mixing time of 40 min,and prereaction time of 72 h.