软锰矿浆烟气脱硫吸收液制取电解锰的工艺研究  

Study on the Process of Preparaing Electrolytic Manganese from Absorption Solution of Flue Gas Desulfurization with Pyrolusite Pulp

作　　者：孙峻[1] 苏仕军[1] 丁桑岚[1] 艾南山[2] 

机构地区：[1]四川大学国家烟气脱硫工程技术研究中心 [2]四川大学环境科学与工程系,四川成都610065

出　　处：《高校化学工程学报》2006年第6期967-973,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：国家科技部资助项目(85-912-04-01-02);国家烟气脱硫工程技术研究中心资助项目(2001DC105003-1);四川省重点科技攻关项目(05GG021-026-04)。

摘　　要：对“软锰矿浆烟气脱硫制取电解锰、高纯碳酸锰及硫酸铵的废气脱硫资源化”体系中脱硫吸收液制取电解锰的工艺进行了实验研究。在吸收液中先加双氧水将Fe2+氧化成Fe3+,再加氨水调节pH值至5.5±0.5后过滤除铁,进而在滤液中按约50mL?L?1的配比添加硫化铵,经沉淀过滤后去除重金属。将除杂后的滤液在采用银、锡、锑、铅合金作阳极板,1Crl8Ni9Ti不锈钢板作阴极板,涤纶布作隔膜制成的电解装置进行直流电解,考查了各电解工艺参数对电流效率和槽电压的影响。结果表明电解工艺参数的较佳控制范围为:电流密度390A·m-2左右,温度35℃左右,硫酸铵浓度110g?L?1左右,SeO2添加量约0.04g?L?1,槽液锰浓度约18g?L?1,进液锰浓度约26g?L?1,进液pH值8左右,制得的电解锰质量达到GB3418-82要求。研究结果表明,软锰矿烟气脱硫吸收液制取电解锰的工艺是可行的,开辟了一条软锰矿脱硫吸收液资源化利用的新途径。In order to produce the electrolytic manganese from the absorption solution of flue gas desulfurization with pyrolusite pulp, the absorption solution should be pretreated to remove the Fe^2＋ ion and the heavy metal impurities in the solution. The Fe^2＋ in the absorption solution was oxidized to Fe3＋ at first by adding oxidant H2O2 into the solution, and then the pH value of the solution was adjusted to 5.5±0.5 by adding aqueous ammonia to precipitate the Fe（OH）3 formed by oxidation of Fe^2＋. After filtration, the ferric impurities were removed, and then the sulphidation agent （NH4）2S of 50mL·L^-1 was added into the filtrate to form the precipitable sulphides of the heavy metals. Filtrate the filtrate once more, the heavy metal impurities were removed and the filtrate of the second time, the purified absorption solution, was ready to be electrolyzed. The electrolysis was conducted in an electrolytic device equipped with an anode of Ag/Sb/Sn/Pb alloy, a cathode of 1Cr18Ni9Ti stainless steel and an ion permeable separator of polyester fabric, The effects of operating parameters on the electric current efficiency and cell voltage were investigated. The suitable electrolysis conditions were found as follows. The electric current density used is 390 A·m^-2, the operating temperature is 35 ℃, the concentration of （NH4）2SO4, SeO2 and Mn^2＋ in the electrolyte are 110 g·L^-1, 0.04 g·L^-1 and 18 g·L^-1, respectively, and in the influent, the Mn^2＋ concentration is 26 g·L^-1 and the pH value is 8. After conducting the pretreatments as mentioned before and operating under above proposed conditions, the metal impurities influencing the production of electrolytic manganese in the absorption solution will be removed, and the electrolytic manganese produced can meet the standard of GB3418-82. This study discloses a novel recycling approach of utilizing the resource coming from the flue gas desulfurization with pyrolusite pulp.

关 键 词：软锰矿 烟气脱硫 吸收液 电解锰 

分 类 号：O614.711[理学—无机化学] X701.3[理学—化学]