论镁电解过程产生“沸腾”的宏观机制

STUDIES ON MACROSCOPIC MECHANISM OF "BUBBLING" IN MAGNESIUM ELECTROLYSIS

研讨了镁电解槽中产生“沸腾”现象的宏观机制。试验证明,硫酸盐、氧化镁等杂质的存在是产生“沸腾”的根本原因。此类杂质引起阳极上产生的氯气泡的细散化,进而破坏了电解质熔体——氯气泡两相流的正常运动状态,结果导致“沸腾”。文中依据提出的宏观机制对“沸腾”时出现的各种现象进行讨论,提出了预防和消除“沸腾”的措施。

The macroscopic mechanism of a very harmful "bubbling" of anode gases sometimes happened in magnesium electrolysis cell was studied. It was indicated that the abnormal "bubbling" was caused by some impurities such as SO_4^(2-) and MgO. When the electrolyte contained more than certain amount of one of these impurities, the bubbles separated from the anode surface became tiny and decentralised. One layer of these small bubbles accumulated on the surface of electrolyte. Then the movement way of two-phase flow ...