电解锰渣基胶凝材料水化过程中Mn迁移行为研究  

Research on Mn migration behavior during hydration of electrolytic manganese residue-based cementitious materials

作　　者：鱼彩红 段楠 崔葵馨[1] YU Caihong;DUAN Nan;CUI Kuixin(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《烧结球团》2025年第1期126-133,共8页Sintering and Pelletizing

基　　金：国家自然科学基金资助项目(52204304)。

摘　　要：本文将电解锰渣进行煅烧处理后与水泥混合制备胶凝材料,分析了不同龄期胶凝材料抗压强度及水化产物组成,并采用BCR顺序提取法和水平振荡法测定了重金属的化学形态和浸出质量浓度,详细探讨了水化过程中锰的迁移固化机理。试验结果表明:电解锰渣中Mn以酸可溶态为主,经较低温度(800℃)煅烧,酸可溶态Mn部分转化为可还原态;经高温度(1100℃)煅烧后则转变为残渣态Mn。水化过程中,酸可溶态Mn转变为氢氧化物,并脱水氧化转变为可还原态。浸出毒性分析结果显示:煅烧及水化过程能够有效固化重金属并去除氨氮,1100℃煅烧电解锰渣制备的胶凝材料中重金属浸出质量浓度符合国家标准,满足建筑材料的环境安全要求。In this paper,the electrolytic manganese residue is calcined and mixed with cement to prepare cementitious materials,the compressive strength and hydration product composition of cementitious materials at different ages are analyzed,the chemical morphology and leaching mass concentration of heavy metals are determined by BCR sequential extraction method and horizontal oscillation method,and the migration and solidification mechanism of manganese during hydration is discussed in detail.The test results show that the Mn in the electrolytic manganese residue is mainly in the acid-soluble state,and the acid-soluble Mn part is converted into a reducible state after calcination at a lower temperature(800℃),and the acid-soluble Mn is transformed into a residue state of Mn after calcination at a high temperature(1100℃).During hydration,the acid-soluble Mn is converted to hydroxide and dehydrated and oxidized to a reducible state.The results of leaching toxicity analysis show that the calcination and hydration process could effectively solidify heavy metals and remove ammonia nitrogen,and the concentration of heavy metals in the cementitious materials prepared by calcining and electrolyzing manganese residue at 1100℃meets the national standards and meets the environmental safety requirements of building materials.

关 键 词：电解锰渣 重金属 BCR 化学形态 固化机理 

分 类 号：X757[环境科学与工程—环境工程]