有机酸溶浸深部杂卤石工艺及机理.pdf

第6期
r严保抑与用
2016年12月
CONSERVATON AND UTILZATION OF MINERAL RESOURCES
Dec.2016
有机酸溶浸深部杂卤石工艺及机理
葛英霞12,李珍12“,黄焱球12,张红
(1.纳米矿物材料及应用教育部工程研究中心,湖北武汉430074;2.中国地质大学材料与化学学院,湖北
武汉430074;3.四川佰瑞德矿业有限责任公司,四川成都610091)
摘要:采用草酸、甲酸对四川块状杂卤石进行溶浸试验,研究杂卤石矿在有机酸中的溶出机理,指导深部朵
卤石的溶采开发。考察了溶浸时间对K'、Mg2+、Ca2“浓度与溶出率的影响,并对比了溶浸前后杂卤石的物
相及形貌变化。结果表明:有机酸溶浸剂有利于K、Mg溶出,不利于Ca2溶出;有机酸溶浸液经加热浓缩
后用无水乙醇洗涤,得到的产物主要为钟、镁硫酸盐,产物成分简单,有利于后期硫酸钾产品的提纯。有机酸
溶浸杂卤石矿主要通过酸解反应分解菱镁矿,生成的CO2对矿石有崩解作用,二者作用促进内部杂卤石的
暴露与溶解。
关键词:杂卤石;甲酸;草酸;溶浸;机理
中图分类号:TD871.1文献标识码:B文章编号:1001-007(2016)06-0047-05
DOI:10.13779/j.cnki.issn001-0076.2016.06.010
Process and Mechanism of Leaching Deep-seated Polyhalite with Organic Acid
GE Yingxia", L/ Zhen,, HANG Yanqiu", ZHANG Hong
(1. Engineering Research Center of Nano-geomaterials of Ministry of Education, Wuhan430074, Chi
na: 2. Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074
China; 3. Sichuan Bestred Mining Co. Ltd, Chengdu 610091, China)
Abstract: The leaching experiment of blocky polyhalite from Sichuan was conducted by using oxal
ic acid and formic acid. This paper mainly study the mechanism of dissolution of polyhalite in or
ganic acid, and to guide the industrialization of mining deep-seated polyhalite. The influence of
tion time on the concentration and recovery of K", Mg",Ca"as well as the phase and
morphology of polyhalite were investigated. The results indicated that organic acids were in favor of
dissolution of K", ME", but adverse to dissolution of Ca". Organic acid leaching solution was
firstly concentrated by heating and then washed by ethanol. The product mainly included potassi
um, magnesium sulfate, which was simple and conducive to the purification of potassium sulfate
he dissolution occurred mainly through acid hydrolysis reaction of magnesite and the disintegration
e ect of CO on the intemal structure of polyhalite, both of which could promote internal exposure
and dissolution of polyhalite
Key words: polyhalite; formic acid; oxalic acid; leaching; mechanism
收稿日期:2016
基金项目:四川省科技厅科技服务业示范项目(2016GFWO15
作者简介:葛英霞(1990-),女,山东寿光人,硕士研究生,主要从事矿产资源综合利用。
通讯作者:李珍(1963-),女,山西临汾人,教授,主要从事矿物材料综合利用。