电动力富集电解锰渣中锰的研究

采用电动力技术对电解锰渣中可溶性锰的迁移、转化和富集规律进行研究。结果表明,直接电动力和CO_2辅助电动力均可在阴极区富集锰,反应48h锰富集量分为达到3.8%和4.3%。两种方式作用下,阴极区锰的富集量随反应时间的增加而增加,阳极区锰含量随反应时间的增加逐渐减少。从阴极到阳极,锰含量逐渐减少。直接电动力作用下的反应机制为,锰在阴极区富集并与OH-反应形成Mn(OH)_2、CaMn(OH)SiO_4等难溶物。CO_2辅助电动力作用下的反应机制为,CO_2与阴极区的OH-反应形成CO_3~(2-),CO_3~(2-)进一步与迁移到阴极区的Mn~(2+)反应形成MnCO_3。

Study on Manganese Enrichment from Electrolytic Manganese Residue by Electrokinetic Technology

Laws of migration, transform, and enrichment of soluble manganese from electrolytic manganese residue (EMR) were studied by electrokinetic technology. The results show that enrichment of soluble manganese can be carried out by both direct electrokinetic method (DEM) and electrokinetic method with CO2 (EMC) with enrichment amount of 3.8% and 4.3% respectively under reaction time of 48 h. Enrichment of manganese rises with increase of reaction time at cathode space. Manganese content at anode space drops with increase of reaction time. Manganese content drops from cathode space to anode space. Reaction mechanism of DEM is that the enriched Mn2 at cathode space reacts with OH- to form insoluble substances such as Mn(OH)2, CaMn(OH)SiO4, et al. Reaction mechanism of EMC is that CO2 at cathode space reacts with OH- to form CO32- and CO32- which further reacting with migrated Mn2 to form MnCO3.