EDTA-2Na盐除垢与清洗液循环利用的实验研究  

The Study of EDTA-2Na Salt Descaling and Cleaning Fluid Recycling

作　　者：曲堂超 肖作义[1] 肖明慧 段连均[3] 魏迪 朱信成 QU Tangchao XIAO Zuoyi XIAO Minhui DUAN Lianjun WEI Di ZHU Xincheng(Inner Mongolia University of Science and Technology Baotou, Inner Mongolia 014010)

机构地区：[1]内蒙古科技大学,内蒙古包头014010 [2]中国北方稀土(集团)高科技股份有限公司冶炼分公司,内蒙古包头014010 [3]包头市排水产业有限责任公司,内蒙古包头014030

出　　处：《工业安全与环保》2017年第9期103-106,19,共5页Industrial Safety and Environmental Protection

摘　　要：利用锅炉行业以及石油化工行业除垢的经验,结合稀土行业的实际情况,提出了稀土湿法冶金行业蒸发器结垢的技术处理,选用EDTA-2Na(乙二胺四乙酸二钠)除垢剂。实验表明,使用EDTA-2Na盐除垢的最优反应条件为质量浓度不小于50 g/L、反应温度控制在70℃、反应时间控制在4 h、pH值控制在13~14(碱度在0.1~0.5 mol/L)之间,反应量控制在1 L除垢液处理10 g结垢物;若使用盐酸配合EDTA-2Na盐除垢,建议先使用盐酸(浓度为5 mol/L)再使用EDTA-2Na溶液;清洗废液再生的最优条件应为pH值调至3.5,再补加一定量(20%)的EDTA-2Na除垢剂,可以达到清洗液的要求并实现循环利用,效果显著。In this paper, based on the experiences from boiler industry and petrochemical industry cleaning and combined with the actual situation of rare earth industry, it is proposed the technical processing of rare earth hydrometal- lurgical industry evaporator fouling and EDTA -2Na （disodium edetate） detergents are selected. Experiments show that, the optimal reaction conditions of using EDTA -2Na salt descaling follow, the concentration is not less than 50 g/L, the reaction temperature and pH is controlled at 70℃ and 13 - 14 （ alkalinity between 0.1 mol/L and 0.5 mol/ L） respectively and the amount of 10 g filths is treated for every 1 L cleaning liquid in 4 hours of reaction, it is recommended that when using EDTA - 2Na salt with hydrochloric acid descaling, the hydrochloric acid （ concentration 5 mol/L） should be used first and then EDTA -2Na solution is used. The optimal conditions of cleaning liquid regeneration should be adjusted to pH 3.5, then a certain amount （20%） of EDTA - 2Na detergents is added and the effect is significant, meeting the cleaning fluid requirements, so as to achieve recycling.

关 键 词：稀土 湿法冶金 EDTA-2Na 除垢与清洗液 

分 类 号：TF351[冶金工程—冶金机械及自动化] X703[环境科学与工程—环境工程]