酸化マグネシウム・炭素陽極を用いるマグネシウムの電解採取に関する研究
酸化物・炭素陽極の溶融塩電解への応用 (第1報)
1969 年 85 巻 977 号 p. 802-810
詳細
1969 年 85 巻 977 号 p. 802-810
In the electrolytic extraction of metallic magnesium, graphite anode and iron cathode are generally used to supply a direct electric current through an electrolytic cell filled with fused magnesium chloride and alkali chloride (sodium chloride or potassium chloride). Then free chlorine is generated on the anode and reduced metal on the cathode.
In our experiment the baked anode of intimate mixture of magnesium oxide and carbonaceous materials was used instead of the graphite anode and the following results were obtained.
1) A very small quantity of free chlorine is detected in the gas formed on the anode and its main constituents are carbon dioxide and carbon mon-oxide.
2) The change of magnesium chloride content in the electrolytic bath is very small.
3) The anode is gradually consumed during the electrolysis and its surface in contact with fused salt becomes porous.
These results show that the free chlorine reacts with magnesium oxide and carbon-as soon as it is generated after the discharge of chloride ion on the anode surface and magnesium chloride formed by this reaction is dissolved in the bath. Therefore it is possible that the electrolysis is continuously carried out by using such an anode without additional supplying of magnesium chloride to the bath.
