铝电解槽废旧阴极氟化物的浸出研究

Fluoride Leaching Test from Spent Pot Lining of Aluminum Electrolysis Cell

在对铝电解槽废旧阴极进行物相和成分分析的基础上,对其所含的氟化物进行了氟的溶出试验,研究液固比、粒径、温度对氟化物溶出的影响。结果表明,当采用水浸出,粒径0.075～0.096mm,液固比55∶1,浸出温度85℃,浸出时间2h时,原料中可溶F-浸出率达到97.8%。溶解后的固体中剩余可溶氟离子约为45mg/L,可作为非危险废弃物予以排放。

Based on XRD analysis and component analysis, spent pot lining （SPL） of aluminum electrolysis cell was leached to recover fluoride. The effects of ratio of liquid to solid （L/S）, particle size and temperature on leaching rate of fluoride were investigated. The results show that leaching rate of soluble F- with water is 97.8% under the optimum conditions including particle size of 0. 075～0. 096 mm, L/S of 55 ： 1, temperature of 85 ℃, and leaching duration of 2 h. The content of soluble fluoride in residue is 45 mg/L which can be disposed as non-hazardous waste.