铵盐体系电解锰渣中石膏的转变规律  

Transformation law of gypsum from electrolytic manganese residue in ammonium salt system

作　　者：曾一凡 舒建成 杨慧敏[1] 赵志胜 陈梦君[1] 杨勇[2,3] 刘仁龙 ZENG Yifan;SHU Jiancheng;YANG Huimin;ZHAO Zhisheng;CHEN Mengjun;YANG Yong;LIU Renlong(Key Laboratory of Solid Waste Treatment and Resource Recycle(SWUST),Ministry of Education,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China;College of Chemistry and Chemical Engineering,Chongqing University,Chongqing 401331,China;Daxin Manganese Mine Branch,Nanfang Manganese Industry Group Co.,Ltd.,Nanning 532315,Guangxi,China)

机构地区：[1]西南科技大学固体废物处理与资源化教育部重点实验室,四川绵阳621000 [2]重庆大学化学化工学院,重庆401331 [3]南方锰业集团有限责任公司大新锰矿分公司,广西南宁532315

出　　处：《化工进展》2022年第9期5115-5121,共7页Chemical Industry and Engineering Progress

基　　金：国家重点研发计划(2018YFC1903500);国家自然科学基金(52174386,21806132)。

摘　　要：电解锰渣已成为阻碍电解锰行业发展的瓶颈,其中锰渣含有的大量石膏是限制其资源化利用的关键。针对锰渣中石膏浸出问题,本文研究了NH_(4)HCO_(3)和NH_(4)Cl用量、浸出初始pH、浸出时间、浸出温度对锰渣中石膏转变规律的影响。研究结果表明,当锰渣与NH_(4)HCO_(3)和NH_(4)Cl之间的质量比为20∶8∶1.5、固液比为1∶5、浸出初始pH为7.5、浸出温度为70℃、浸出时间为120min时,石膏的浸出率达到90.0%;浸出锰渣主要物相含有CaCO_(3)、SiO_(2)、Ca_(2)Mn_(2)(OH)_(4)Si_(4)O_(11)·2H_(2)O、Mg_(5.0)Al_(6)Fe_(4)Si_(2.5)Al_(1.5)O_(10)(OH)_(8)以及KAl_(3)Si_(3)O_(10)(OH)_(2)等,其中浸出锰渣中MnO含量由未浸出前的7.45%提高到14.71%。转变规律表明,NH_(4)HCO_(3)与锰渣中的石膏反应转变成(NH_(4))_(2)SO_(4)和CaCO_(3),而NH_(4)Cl作为盐试剂可进一步促进石膏的溶解,从而提高石膏的浸出率。Electrolytic manganese residue(EMR)has become a bottleneck hindering the development of electrolytic manganese industry,and the large amount of gypsum in EMR is the key to limit its resource utilization.Aiming at the problem of gypsum leaching from EMR,the effects of NH_(4)HCO_(3) and NH_(4)Cl dosage,initial pH of leaching,leaching time and leaching temperature on the transformation law of gypsum in manganese residue were studied.The results showed that the leaching efficiency of gypsum in EMR was 90.0%when the mass ratio of manganese residue to NH_(4)HCO_(3) and NH_(4)Cl was 20∶8∶1.5,the solid-liquid ratio was 1∶5,the initial pH of leaching was 7.5,the leaching temperature was 70℃and the leaching time was 120min.The main phases of the leaching EMR included CaCO_(3),SiO_(2),Ca_(2)Mn_(2)(OH)_(4)Si_(4)O_(11)·2H_(2)O,Mg_(5.0)Al_(6)Fe_(4)Si_(2.5)Al_(1.5)O_(10)(OH)_(8) and KAl_(3)Si_(3)O_(10)(OH)_(2),and the content of MnO in EMR increased from 7.45%to 14.71%after leaching.The transformation law of gypsum in EMR indicated that NH_(4)HCO_(3) reacted with gypsum in EMR to convert into(NH_(4))_(2)SO_(4) and CaCO_(3),and NH_(4)Cl as a salt reagent can further promote the dissolution of gypsum,and thus improving the leaching efficiency of gypsum.

关 键 词：电解锰渣 石膏 转变规律 工业固废 铵盐体系 

分 类 号：X753[环境科学与工程—环境工程]