电动力去除电解锰渣中锰的实验探索

Experimental Research on Manganese Removal from Electrolytic Manganese Residue by Electrodynamic Force

通过电动力技术对电解锰渣中锰的迁移、转化和去除规律进行研究。结果表明:H_2C_2O_4溶液促进了电解锰渣中锰的去除。增加电流密度有助于锰的去除,但能耗随之增加。增加反应时间有助于锰的去除。电解槽D区渣样中锰的去除效果最明显,锰质量分数下降至0.33%。反应机理为阳极区H_2C_2O_4在酸性条件下还原电解锰渣中高价锰形成Mn^(2+), Mn^(2+)在电动力作用下由阳极向阴极迁移。阴极同时电解水产生OH^-, OH^-与Mn^(2+)作用形成Mg(OH)_2, Mg(OH)_2进一步与空气反应形成Mn_3O_4。

Laws of migration, transform and removal of manganese ion from electrolytic manganese residue were studied by electrokinetic technology. Results showed that H2C2O4 solution promoted the removal of manganese ion. Increase of current density promoted removal efficiency of manganese ion, but increased energy consumption. Increase of reactive time promoted removal of manganese ion. Removal of manganese ion in space D of the electrolyzer was most noticeable and the mass fraction of manganese fell to 0.33%. The reaction mechanisms were that high valence manganese oxide compounds were reduced to Mn^2＋ by H2C204 at acid environment of the anode and Mn^2＋ ion migrated from anode to cathode under electrodynamic force. Mn^2＋ ion reacted with OH^- and formed Mg（OH）2 at the cathode, and. Mg（OH）2 further reacted with O2 from air to form Mn3O4.