摘要
对含Mg^(2+)156.83 mg/L的采矿废水,采用“碱-酸”工艺处理,添加NaOH 1.5 g/L(pH=11.5),沉淀反应2 min、搅拌陈化1 h、自然沉降2 h后过滤,滤液再用H_(2)SO_(4)回调pH~7,中水残余Mg^(2+)和Ca^(2+)浓度小于10 mg/L,去除率均在85%以上。中水用于含稀土磷矿浮选,浮选闭路试验取得了与自来水相近的指标,精矿含33.20%P_(2)O_(5)和2.63%REO,回收率分别为87.52%和57.88%,含杂质Fe 3.95%。通过“碱-酸”工艺处理,废水可用于稀土磷矿浮选,实现了废水的资源化利用。
Mining wastewater containing Mg^(2+) 156.83 mg/L was treated with the process of “alkali-acid” adjustment. The water was treated with 1.5 g/L NaOH(pH=11.5), and then was filtrated after precipitation reaction 2 min, agitation ageing 1 h and natural settling 2 h. The pH of supernatant was adjusted to 7 with 0.5 g/L H_(2)SO_(4) to obtain normal water. The remained concentrations of Ca^(2+) and Mg^(2+) were less than 10 mg/L, and the removal rates were both above 85%. The normal water was reused in a RE-bearing apatite flotation, and the locked cycle test index was closed to that of tap water. The concentrate contained 33.20% P_(2)O_(5) and 2.63% REO, the recoveries were 87.52% and 57.88%, respectively, and the impurity Fe content was 3.95%. With the “alkali-acid” technology treatment, the mining wastewater can be reused in RE bearing apatite flotation and was realized utilization.
作者
饶金山
刘超
胡红喜
吕昊子
陈志强
何晓娟
RAO Jin-shan;LIU Chao;HU Hongxi;LYU Hao-zi;CHEN Zhi-qiang;HE Xiao-juan(Institute of Resources Comprehensive Utilization t Guangdong Academy of Science,Guangzhou 510650,China;State Key Laboratory of Rare Metals Separation and Comprehensive Utilization,Guangzhou 510650,China;Guangdong Provincial Key Laboratory of Mineral Resources Development and Comprehensive Utilization,Guangzhou 510650,China)
出处
《稀土》
CAS
CSCD
北大核心
2022年第3期123-130,I0006,共9页
Chinese Rare Earths
基金
广东省科学院项目(2019GDASYL-0105049、2020GDASYL-20200302009)
广东省科技计划项目(2017B090904035)
广州市科技计划项目(201807010076、201607020039)。
关键词
废水处理
镁离子
钙离子
含稀土磷矿
浮选
wastewater treatment
Mg^(2+)
Ca2+
REEs-bearing apatite
flotation
作者简介
饶金山(1988-),男,江西会昌人,硕士,工程师,主要从事有色金属及稀有金属资源综合利用研究,E-mail:18022851506@163.com;通讯作者:陈志强,教授级高工,E-mail:qiang6399@163.com。
