摘要
酸解红土镍矿废水中Mg2+浓度高达20 528.35 mg/L,该废水既不能回用于生产流程,也不能外排。为了使废水能循环利用,急需解决Mg2+的脱除。试验利用多种碱性矿物脱除废水中镁离子的影响因素。结果表明石灰、钢渣和粉煤灰均具有脱除Mg2+效果,其中石灰是影响Mg2+脱除率的主要因素,两种或两种以上矿物复配能产生叠加效果。在石灰-粉煤灰体系下,当石灰与粉煤灰比例为1、总投加量为150 g/L、室温为20℃时,搅拌120 min,Mg2+脱除率可稳定在90%以上,处理水能够再次循环利用。
The concentration of Mg2＋ reaches 20 528.35 mg/L in the wastewater of nickel laterite after acid hydrolysis which can- not be used and discharged in production process. To remove Mg2＋ for cyclic utilization is a key problem. The effective factors of using a variety of alkaline mineral to remove Mg2＋ in wastewater were researched. The results show that lime, slag and coal ash have an ef- fect on removing Mg2＋. Lime is a major factor affecting the extractions rate of Mg2＋, meanwhile two or more minerals mixed can pro- duce stack effect. When the ratio of lime and coal ash is up to 1, total dosage is 150 g/L, temperature is 20 ℃ ,stirring time is 120 min, removal rate of Mg2＋ reaches more than 90 %.
出处
《净水技术》
CAS
2013年第4期35-38,共4页
Water Purification Technology
关键词
红土镍矿
含镁废水
石灰
钢渣
粉煤灰
nickel Laterite magnesium-containing wastewater lime steel slag coal ash
作者简介
王金博（1986-），男，硕士，研究方向为固体废物再资源化。电话：15808801324；E-mail：wjb518512@163．com。
【通讯作者】张召述，教授，博士生导师。E-mail：zhangjia05546@126．com。
