碳酸盐对电解锰渣中可溶性锰固定和硫酸钙转化的研究  

Study of Soluble Manganese Immobilization and Calcium Sulfate Conversion from Electrolytic Manganese Residue by Using Carbonate

作　　者：陈红亮[1] 龙黔[1] 舒建成[2] 张秋云[1] 张玉涛[1] 

机构地区：[1]安顺学院化学化工学院,贵州安顺561000 [2]重庆大学化学化工学院,重庆400044

出　　处：《工业安全与环保》2017年第5期81-84,89,共5页Industrial Safety and Environmental Protection

基　　金：国家自然科学基金(41403114);贵州省教育厅科技拔尖人才支持项目(黔教合KY字[2016]094)

摘　　要：电解锰渣是电解锰生产过程中碳酸锰矿经酸浸、中和、压滤工序后产生的废渣。重金属锰是电解锰渣中的主要污染物,在渣中主要以可溶化合物MnSO_4·H_2O,(NH_4)_2Mn(SO_4)_2·6H_2O等形式存在。采用碳酸盐碳化处理电解锰渣,研究渣中可溶性锰固定、硫酸钙转化的矿物学特征和机制。结果表明,Na_2CO_3能够有效固定渣中的锰离子形成MnCO_3矿物。反应时间90 min,Na_2CO_3与渣质量比为0.05时,Na_2CO_3对锰的固定率达到99.9%,渣浆中锰离子质量浓度下降至5.7 mg/L。反应机制主要是渣中MnSO_4·H_2O,(NH_4)_2Mn(SO_4)_2·6H_2O与碳酸盐反应形成球状MnCO_3矿物;当Na_2CO_3与渣质量比大于0.4时,渣中柱状、条状CaSO_4·2H_2O转化为CaCO_3。Electrolytic manganese residue （EMR）, a by - product of the electrolytic metal manganese process, is produced by the acid leaching, neutralization, and pressure filtration treatment of manganese carbonate powder. Soluble Mn is a main pol- lutant from the EMR and existed as MnSO_4·H_2O,（NH_4）_2Mn（SO_4）_2·6H_2O, etc in the EMR. This paper has studied miner- alogical characteristics and mechanism of soluble Mn immobilization and calcium sulfate conversion from the EMR by using car- bonate. Results indicate that soluble Mn can be immobilized by Na_2CO_3 and produced spheroidal MnCO_3. With the reaction time of 90 mins, the immobilization efficiency of Mn can reach 99.9% when Na_2CO_3 and residue mass ratio is 0.05 and in the meanwhile, Mn2＋ concentration is reduced to 5.7 mg/L in the leachate. The reaction mechanism is that, MnSO_4·H_2O,（NH_4）_2Mn（SO_4）_2·6H_2O from the EMR react with carbonate to form globular MnCO3. When the mass ratio of Na_2CO_3 residue is more than 0.4, CaSO_4·2H_2O with regular cylindrical particles and strip particles will be translated into CaCO_3 by Na_2CO_3.

关 键 词：电解锰渣 碳酸盐 固定 硫酸钙 转化 

分 类 号：X757[环境科学与工程—环境工程]