摘要
采用浸提法提取煤矸石中和渣酸浸物中的有价元素,考察了溶出温度、溶出时间和溶出液固质量比对酸浸物溶出过程的影响;以单因素实验为基础,进行正交实验,优化溶出工艺条件,用X射线衍射(XRD)和扫描电镜(SEM)表征煤矸石中和渣酸浸物、酸化产物及滤渣的物相和微观形貌。结果表明,酸浸物溶出最优工艺条件为液固质量比3:1、溶出时间40 min、溶出温度80℃,此时有价元素氧化物的溶出率分别为TiO282.63%,Fe2O396.48%,Al2O398.33%,CaO 87.72%,MgO 95.31%。提取后滤渣中只有SiO2和少量TiO2及CaSO4存在,表明煤矸石中和渣酸浸物中的有价元素通过该溶出工艺可充分溶出。
Coal gangue is a kind of coal-bearing kaolinite associated with coal and a kind of solid waste discharged during coal mining and coal washing.The output of coal resources in our country is huge,so there is a large amount of solid waste emission of coal gangue.The high value-added comprehensive utilization is of great significance to the economy,the environment and the society.The neutralized slag acid leaching substances of coal gangue was used to extract the valuable elements from the acid solution.The effects of dissolution temperature,dissolution time and mass ratio of liquid to solid on the dissolution process of acid solution were researched in this work.Based on the single factor experiment,the dissolution conditions were optimized by these orthogonal experiments.The phase and micro morphology of the neutralized slag acid leaching substances of coal gangue,the acidified product and the acid slag were analyzed by XRD and SEM.The results indicated that the dissolution rates of valuable element oxides were TiO282.63%,Fe2O396.48%,Al2O398.33%,CaO 87.72%,MgO 95.31%,respectively,when dissolution temperature was 80℃,dissolution time was 40 min,mass ratio of liquid to solid was 3:1.Only SiO2 and a small amount of TiO2 were found in acid slag after neutralization residue dissolved.The existence of CaSO4 indicated that the valuable elements in coal gangue and residue acid were fully dissolved through this process.This method had the advantages of short dissolution time,less water consumption and higher dissolution rate of valuable elements in acid leaching system.With this research,it is expected to provide a new approach for the efficient utilization of coal gangue resources.
作者
郑光亚
陈正杰
夏举佩
王伟杰
辜芳
师一博
李浩林
李宛霖
刘成龙
Guangya ZHENG;Zhengjie CHEN;Jupei XIA;Weijie WANG;Fang GU;Yibo SHI;Haolin LI;Wanlin LI;Chenglong LIU(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650500,China;Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650093,China;College of Chemistry and Chemical Engineering,Ningxia Normal University,Guyuan,Ningxia 756000,China)
出处
《过程工程学报》
CAS
CSCD
北大核心
2020年第2期174-181,共8页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号：21566018)
宁夏回族自治区重点研发计划项目(编号：2018BEE03021)
关键词
煤矸石
中和渣
酸浸物
溶出
coal gangue
neutral residues
acid leaching substances
dissolution
