铁强化电解锰阳极液体系中氧化锰矿烟气脱硫和锰浸出工艺

Using iron promoted manganese oxide ore for simultaneous flue gas desulfurization and Mn leaching:a process study

结合电解锰生产工艺,以氧化锰矿为原料,以电解锰生产过程产生的电解阳极液废水配置烟气脱硫浆液,在其中添加FeSO_4强化电解锰阳极液体系下氧化锰矿烟气脱硫及浸锰能力,探讨铁强化氧化锰矿烟气脱硫和浸锰的工艺条件对烟气SO_(2)脱除和锰浸出的影响机制。研究发现FeSO_4的加入,通过FeSO_4与MnO_(2)之间的氧化还原反应以及产物三价铁离子和二价锰离子的协同催化作用,可同时提高锰矿烟气脱硫效率和锰的浸出率。锰矿粒径越小,脱硫及浸锰效率越高。温度升高,氧化锰矿浆液烟气脱硫率逐渐下降,浸锰率则先升高后下降,并在60℃时达到最大。浆液液固比和烟气流量的增大均会导致烟气脱硫率的下降,但会提高氧化锰矿浸锰率。进口SO_(2)浓度过高会导致脱硫率下降,但更有利于浸锰。采用5级逆流吸收对7%的烟气进行铁离子强化氧化锰浆脱硫,得到最终SO_(2)出口浓度293μL/L,溶液Mn~(2+)浓度为44.72g/L,满足电解要求。铁强化电解锰阳极液体系有效回收利用了电解锰生产废水,不仅集脱硫浸锰工艺为一体,且可实现脱硫和浸锰效率的同时提升,为电解锰行业的清洁生产和资源综合利用提供理论依据和技术参考。

In order to remove SO2 from manganese slag calcination process,and combine with the production features of electrolytic manganese production enterprises,the manganese oxide ore was used as the raw material,and the wastewater anode solution of electrolytic manganese was used to prepare the ore pulp(desulfurizer).The influences of processing parameters and FeSO4 added on desulfurization and manganese leaching were studied.The results indicated that the introduction of FeSO4 promoted the Mn leaching via the redox reaction between MnO2 and FeSO4,and then,the product(Fe3+)and the Mn2+in solution could act as the catalyst to catalyze the desulfurization reaction.The desulfurization activity and the Mn leaching rate increased with the decrease of the ore particle size.With the increase of reaction temperature,the desulfurization activity decreased,and the Mn leaching rate increased at first and then decreased which reached the maximum value at 60℃.When the liquid-solid ratio and the inlet flow rate increases,the desulfurization efficiency decreased,but the Mn leaching rate was enhanced.The 5-stage manganese oxide slurry desulfurization of the 7%flue gas with FeSO4 added showed that the outlet SO2 was 293μL/L,and the Mn2+concentration of lixivium was 44.72g/L,which met the requirements of electrolytic manganese.The present flue gas desulfurization system could recycle the wastewater anode solution of electrolytic manganese,and provide a new technology for sulfur dioxide removal from flue gas and Mn extraction form manganese oxide ore simultaneously.The present study provides theoretical basis and technical reference for clean production and comprehensive utilization of resources in electrolytic manganese industry.