不同煅烧温度下白云岩砂性状变化及对电解锰渣中Mn^(2+)的稳定效果  

Characteristics of dolomite sand at different calcination temperatures and its stabilization effect on Mn^(2+)in electrolytic manganese residue

作　　者：翟念 刘方[1,2] 朱健[1,2] 罗海波[1] 陈祖拥[2] ZHAI Nian;LIU Fang;ZHU Jian;LUO Hai-bo;CHEN Zu-yong(Department of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China;Key Laboratory of Karst Geological Resources and Environment Ministry of Education,Guiyang 550025,China)

机构地区：[1]贵州大学资源与环境工程学院,贵州贵阳550025 [2]喀斯特地质资源与环境教育部重点实验室,贵州贵阳550025

出　　处：《应用化工》2023年第2期451-455,463,共6页Applied Chemical Industry

基　　金：贵州省科技计划项目(黔科合支撑[2019]2864号);贵州省科技计划项目(黔科合平台人才[2017]5788号)。

摘　　要：为减少电解锰渣中重金属元素向水体迁移带来的环境影响,在电解锰渣中添加煅烧白云岩砂对Mn^(2+)进行固化作用,采用XRD、BET和SEM方法对煅烧前后白云岩砂的组织结构进行物相及微观组织形貌分析,并对煅烧白云岩砂在不同添加剂量下对电解锰渣中Mn^(2+)的稳定效果进行了分析评价。结果表明,随煅烧温度从600℃升高至800℃,白云岩砂逐渐分解形成CaO和MgO等碱性氧化物,煅烧白云岩砂的比表面积、孔容及孔径不断增加,其分别是未煅烧白云岩砂的1.16~3.96倍;1.7~4.18倍;1.99~16.12倍;当电解锰渣中添加10%的800℃煅烧白云岩砂时,Mn^(2+)的稳定效率为99.95%,而添加30%的700℃煅烧白云岩砂时,Mn^(2+)的稳定效率达99.85%,Mn^(2+)浓度低至1.66 mg/L。煅烧白云岩砂对电解锰渣中Mn^(2+)的稳定作用主要是Mn^(2+)以MnO2和MnOOH的形式固化,700~800℃煅烧白云岩砂可以作为固化电解锰渣中Mn^(2+)的一种有效稳定剂。In order to reduce the environmental impact caused by the migration of heavy metals in electrolytic manganese residue to water,this paper added calcined dolomite sand to electrolytic manganese residue to solidified Mn^(2+),and analyzed the microstructure and microstructure of dolomite sand before and after calcination by XRD,BET and SEM methods.The stabilization effect of calcined dolomite sand on Mn^(2+)in electrolytic manganese residue at different dosage was analyzed and evaluated.The results show that with the calcination temperature increasing from 600℃to 800℃,the dolomite sand gradually decompositions to form alkaline oxides such as CaO and MgO.The specific surface area,pore volume and pore size of calcined dolomite sand increase continuously,which are 1.16~3.96 times,1.7~4.18 times and 1.99~16.12 times of uncalcined dolomite sand,respectively.When 10%calcined dolomite sand at 800℃is added to electrolytic manganese residue,the stabilization efficiency of Mn^(2+)is 99.95%,and when 30%calcined dolomite sand at 700℃is added,the stabilization efficiency of Mn^(2+)is 99.85%,and the concentration of Mn^(2+)is as low as 1.66 mg/L.The stabilization effect of calcined dolomite sand on Mn^(2+)in electrolytic manganese residue is mainly that Mn^(2+)is solidified in the form of MnO2and MnOOH.The calcined dolomite sand at 700~800℃can be used as an effective stabilizer to solidified Mn^(2+)in electrolytic manganese residue.

关 键 词：电解锰渣 白云岩砂 煅烧 稳定 

分 类 号：TQ137.1[化学工程—无机化工] X753[环境科学与工程—环境工程]