Roles of Electrolyte Characterization on Bauxite Electrolysis Desulfurization with Regeneration and Recycling
Roles of Electrolyte Characterization on Bauxite Electrolysis Desulfurization with Regeneration and Recycling
复制标题
电解液表征在铝土矿电解脱硫及再生循环中的作用
DOI：
10.1007/s11663-016-0841-4
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发表时间：
2017-02-01
影响因子：
3
通讯作者：
Wang, Mingyong
中科院分区：
文献类型：
--
作者：
Gong, Xuzhong;Wang, Zhi;Wang, Mingyong
对铝土矿电解支持电解质NaCl的回收利用进行了研究。电解液过滤后加入无水CaCl2进行再生，通过观察脱硫率和槽电压的变化，考察了电解液性质对铝土矿电解的影响。结果表明，随着电解液循环次数的增加，脱硫率增加。同时，循环次数的增加导致了电解液pH值的降低和Fe离子浓度的增加，这是随着电解液循环次数的增加，脱硫率提高的主要原因。第二次电解后电解液pH值低于1.5，由于Fe 3+浓度的增加和黄钾铁矾生成的抑制，脱硫率明显提高。Ca~（2+）浓度的增加对脱硫率和阳极表面活性无明显影响。而加入Ca2+后，阴极表面被CaSO4·nH2O覆盖，导致槽电压升高。
The recycling of NaCl used as supporting electrolyte for bauxite electrolysis was carried out in this study. The electrolyte was regenerated by adding anhydrous CaCl2into the solution after filtration, and effects of electrolyte characterization on bauxite electrolysis were examined by observing the change in desulfurization ratio and cell voltage. The results indicated that the desulfurization ratio increased with increasing recycling times of electrolyte. In the meantime, the increase in recycling times has led to the decrease in pH value as well as the increase in Fe ion concentration in the electrolyte, which were the main reasons for the increase in the desulfurization ratio with increasing recycling of electrolyte. The pH value of electrolyte after second electrolysis was lower than 1.5, and the desulfurization ratio increased obviously due to the increase in Fe3+concentration and suppression of jarosite formation. The increase in Ca2+concentration did not apparently change desulfurization ratio and anode surface activity. However, with Ca2+addition, the cathode surface was covered by CaSO4·nH2O, thus resulting in the increase of cell voltage.