复合硅酸盐水泥固化电解锰渣及毒性浸出  

Solidification/Stabilization and Toxicity Leaching of Electrolytic Manganese Residue Using Composite Portland Cement

作　　者：母维宏 周新涛[1] 和森 黄静 罗中秋[1] 马越 王路星 邵周军 Mu Weihong;Zhou Xintao;He Sen;Huang Jing;Luo Zhongqiu;Ma Yue;Wang Luxing;Shao Zhoujun(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650500;Faculty of Mechanical and Electrical Engineering,Xichang University,Xichang,Sichuan 615000)

机构地区：[1]昆明理工大学化学工程学院,云南昆明650500 [2]西昌学院机械与电气工程学院,四川西昌615000

出　　处：《非金属矿》2020年第2期5-8,共4页Non-Metallic Mines

基　　金：国家自然科学基金地区基金(51662024,21866018);昆明理工大学引进人才科研启动基金资助项目(KKSY201605021);昆明理工大学分析测试基金(2016T20160009);云南科技厅青年基金(2017FD093);云南教育厅资助性项目(2017ZZX147)。

摘　　要：对原料电解锰渣(EMR)进行毒性浸出分析,以复合硅酸盐水泥(PC32.5R)为固化剂固化/稳定化处理EMR。研究不同PC32.5R掺量对固化体无侧限抗压强度和毒性浸出的影响,在此基础上,采用XRD和SEM分析固化体物相组成及微观形貌变化,探讨固化体在不同pH值浸取下的环境安全性。结果表明,EMR浸出液中Mn的浸出质量浓度为1082.43 mg/L,远超GB 8978-1996标准限值(2 mg/L)。采用PC32.5R对EMR进行固化处理,可满足EMR的无害化处理要求;从固化体的长期堆放考虑,EMR的处理量不宜超过85%。XRD和SEM结果表明,EMR中的含锰矿物MnSO4·2H2O、(NH4)2Mn(SO4)2·6H2O及可溶性Mn经PC32.5R固化后向更加稳定的锰钙辉石(CaMnSi2O6)和硅酸锰(MnSiO3)等难溶矿物相转变;同时水化凝胶可把EMR中的各组分胶结在一起,进而有效抑制EMR固化体中Mn的溶出。Toxicity leaching of electrolytic manganese residue(EMR)was carried out,and it was solidified/stabilized by composite Portland cement(PC32.5R)as a curing agent.The effects of PC32.5R contents on unconfined compressive strength and toxicity leaching of the solidified samples were studied.XRD and SEM were used to analyze the microstructure of the solidified samples.Additionally,the environmental safety of samples was also determined with different pH leaching agents.The results show that the leaching concentration of Mn in EMR leachates is 1082.43 mg/L far exceeding the standard limit(2 mg/L)of GB8978-1996.The solidification/stabilization of EMR using PC32.5R can meet the requirements of harmless treatment;For a long-term stockpiling,the treatment amount of EMR should not be higher than 85%.The results of XRD and SEM show that the manganese-containing minerals in EMR such as MnSO4·2H2O,(NH4)2Mn(SO4)2·6H2O and soluble Mn are solidified/stabilized by PC32.5R to transform into more stable compounds like manganese feldspar(CaMnSi2O6)and manganese silicate(MnSiO3)and other phase;meanwhile,the hydration products can connect the EMR components together with an overall to effectively control the dissolution of Mn in the solidified samples.

关 键 词：电解锰渣 复合硅酸盐水泥 毒性浸出 固化/稳定化 

分 类 号：X781[环境科学与工程—环境工程]