电解锰渣浆液烟气脱硫性能及机制  

Performance and mechanism of electrolytic manganese slag slurry for flue gas desulfurization

作　　者：聂紫萌 杨点 熊玉路 李英杰[1] 田森林[1] 宁平[1] NIE Zimeng;YANG Dian;XIONG Yulu;LI Yingjie;TIAN Senlin;NING Ping(College of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan,China)

机构地区：[1]昆明理工大学环境科学与工程学院,云南昆明650500

出　　处：《化工进展》2022年第2期1063-1072,共10页Chemical Industry and Engineering Progress

基　　金：国家重点研发计划(2018YFC0213405)。

摘　　要：电解锰渣是电解锰生产过程中产生的锰矿石酸浸渣,富含锰、铁等活性组分,理论上可催化氧化SO_(2)实现烟气脱硫,同时脱硫后的电解锰渣可资源化利用,然而目前尚未见电解锰渣矿浆脱硫的研究报道。本文研究了工艺参数对电解锰渣浆液脱除SO_(2)性能的影响,探究了电解锰渣浆液烟气脱硫的过程机制。结果表明:锰渣粒径为200目(<75μm)、锰渣浆液初始浓度5000mg/L、气体流量400mL/min、进口SO_(2)体积分数0.20%、反应温度50℃、反应时间180min的条件下,电解锰渣浆液脱硫率最高可达93.87%。脱硫前后电解锰渣XRD、SEM、XPS表征结果表明,MnO_(2)、MnO、Fe_(2)O_(3)等活性组分参与SO_(2)反应,且浆液中的Mn^(2+)、Fe^(3+)等过渡金属离子液相催化氧化SO_(2)生成H_(2)SO_(4),实现烟气脱硫。Electrolytic manganese residue(EMR)is the acid leaching slag of manganese ore produced in the production process of electrolytic manganese,which is rich in active components such as manganese and iron.In theory,the use of electrolytic manganese slag slurry for flue gas desulfurization realizes the resource utilization of electrolytic manganese slag while removing SO_(2),which promotes the sustainable development of the electrolytic manganese industry.However,there is no research report on the desulphurization of EMR slurry.The influence of process conditions on the efficiency of desulfurization was studied.The experimental results showed that the bestprocess conditions for EMR slurry desulfurization were:EMR particle size was 200 meshes(<75μm),manganese slag slurry concentration was 5000mg/L,the mixed gas flow rate was 400mL/min,imported SO_(2)concentration was 0.20%,and the temperature was 50℃.Under these conditions,the highest desulfurization rate at 180min was 93.87%.By analyzing the changes of ore pulp ion concentration and the XRD,SEM,XPS patterns of the products,the performance and mechanism of flue gas desulfurization of EMR slurry were investigated.MnO_(2),MnO,Fe_(2)O_(3)underwent redox reactions with SO_(2)and formed metal sulfates.SO_(2)was catalyzed and oxidized by transition metal ions such as Mn^(2+)and Fe^(3+)in the ore pulp to generated H_(2)SO_(4).

关 键 词：电解锰渣 资源化利用 二氧化硫 烟气脱硫 催化氧化 

分 类 号：X753[环境科学与工程—环境工程]