Abstract

The spent cathode carbon block (SCCB) produced from the overhaul aluminum reduction cell is regarded as hazardous solid waste because it contains a large amount of soluble fluoride and small amount of cyanide. Coupling vacuum-heating method is considered an effective way to address the issues of such hazardous waste. Herein, SCCB is processed under the conditions of 3000 Pa and 1673–1973 K. The correlation between soluble fluoride content and treatment time was analyzed. The apparent activation energy of the detoxification reaction was calculated based on the Arrhenius equation. The rate-determining step of the detoxification process has also been analyzed in detail. The results show that the detoxification process is a first-order reaction. The apparent activation energy was k = 15.08 kJ mol⁻¹, and gas diffusion was the rate-determining step of the detoxification reaction.

Graphical Abstract

中文翻译：

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铝冶炼厂废阴极碳块真空热处理过程动力学的研究

摘要

大修铝还原池生产的废阴极碳块（SCCB）被视为危险固体废物，因为它包含大量的可溶性氟化物和少量的氰化物。耦合真空加热方法被认为是解决此类危险废物问题的有效方法。在此，SCCB在3000 Pa和1673–1973 K的条件下进行处理。分析了可溶性氟化物含量与处理时间之间的相关性。根据Arrhenius方程计算解毒反应的表观活化能。还详细分析了排毒过程的速率确定步骤。结果表明，排毒过程是一级反应。表观活化能为k ＝ 15.08kJ mol ^-1，并且气体扩散是解毒反应的速率确定步骤。

图形概要