摘要
青海盐湖资源丰富,在盐湖提锂过程中副产了大量含锂Mg(OH)_(2)镁渣,由于利用条件和工艺的限制,其大部分被企业堆置放弃,造成资源的严重浪费和生态环境的破坏,因此提锂副产镁渣的高值化利用具有重要的意义。本研究仅采用盐湖提锂副产镁渣和可溶性铝盐作为原料,采用水热法成功制备了SO^(2-)和CO_(3)^(2-)插层的镁基层状复合金属氢氧化物(LDHs)。并通过XRD、FT-IR、Raman、TG-DTG等手段对产物的结构、形貌等进行了表征。制备过程中不需要加入其他碱作为沉淀剂,不产生钠盐或铵盐等副产物,产物只需少量水洗涤即可,是一种绿色、经济的制备工艺。此外,在反应过程中可将镁渣中90%的锂进行回收,不仅实现了副产镁渣的高值化利用,还回收了夹带的锂,对盐湖镁锂资源综合高效利用提供了一种有效途径。
The salt lake resources are rich in Qinghai.In the process of lithium extracting,a large amount of by-products of Mg(OH)_(2) containing lithium produced.However,limited by cost and technology,most Mg(OH)_(2) was abandoned directly.In this study,the by-product Mg(OH)_(2) is used as raw material and hydrothermal synthesis method is employed to prepare MgAl-LDHs.The structure and morphology of the MgAl-LDHs were characterized by XRD,FT-IR,Raman and TG-DTG.This process only uses Mg(OH)_(2) and soluble aluminum salts as raw materials,and it’s not necessary to add alkali as a precipitating agent.In addition,there are few by-products produced and only a small amount of water needed to wash the product.Meanwhile,about 90%Li+in by-product Mg(OH)_(2) entered the liquid phase after the reaction,which could be further recycled.This process finally realized the goal of waste recycling and efficient utilization of salt lakes resources.
作者
杨佳亓
樊发英
朱朝梁
史一飞
樊洁
邓小川
YANG Jia-qi;FAN Fa-ying;ZHU Chao-liang;SHI Yi-fei;FAN Jie;DENG Xiao-chuan(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China;Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources,Xining,810008,China;University of Chinese Academy of Sciences,Beijing,100049,China)
出处
《盐湖研究》
CAS
CSCD
2021年第2期79-85,共7页
Journal of Salt Lake Research
基金
青海省科技厅科技成果转化专项(2016GX-103)
青海省科技厅自然基金(2016ZJ-927Q)
西部之光B类项目(Y610101037)
中国科学院弘光专项(KFJ-HG-ZX-008)。
关键词
层状复合氢氧化物
水热法
氢氧化镁
Layered double hydroxides
Hydrothermal method
Magnesium hydroxide