碱金属
浸出(土壤学)
盐酸
无机化学
化学
粒径
氟化物
活化能
铝
动力学
电解
碳纤维
核化学
材料科学
有机化学
物理化学
复合材料
复合数
土壤科学
土壤水分
物理
电解质
量子力学
环境科学
电极
作者
Jie Yuan,Huijin Li,Shuang Ding
出处
期刊:Processes
[Multidisciplinary Digital Publishing Institute]
日期:2022-04-25
卷期号:10 (5): 849-849
被引量:14
摘要
Abundant carbon resides in spent cathode carbon (SCC) of aluminum electrolysis and its high-purity carbon powder is conducive to high-value recycling. The alkali-fused SCC was separated and effectively purified using an HCl/NaF solution. Effects of particle size, leaching temperature, time, initial acid concentration, and sodium fluoride dosage, on the purity of carbon powder and aluminum removal rate, were investigated. Using aluminum as the research object, kinetics of aluminum acid leaching were examined by single-factor experiments. Results showed that under an initial 4 M HCl concentration, particle size D(50) = 67.49 μm, liquid-solid ratio of 15:1, 333 K, 120 min, 0.3 M NaF, carbon powder with ash level below 1% were obtained in subsequent purification of SCC. The leaching process was described by Avram equation, the model characteristic parameter was 0.75147 and the apparent activation energy was 22.056 kJ/mol, which indicated a mixed control mechanism between chemical reactivity and diffusion. The kinetic reaction equation of leaching aluminum from alkali-fused SCC in a mixed HCl/NaF system was established.
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