Synergistic recovery for Al and Ga within high-alumina fly ash by carbochlorination using the response surface method

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management Pub Date : 2025-05-06 DOI:10.1016/j.wasman.2025.114853

Wang Long , Zhao Xin-xin , Zhang Zi-mu , Zhang Ting-An , Lv Guo-Zhi , Dou Zhi-He , Liu Yan , Fan zhi-yu

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Abstract

The synergistic extraction of critical elements (Al, Ga) from high-alumina fly ash has gained prominence in addressing resource scarcity and mitigating environmental impacts. This study introduces an efficient carbochlorination approach to overcome the drawbacks of conventional acid/alkali methods, including excessive energy demand and secondary pollution. Response surface method was employed to optimize Al and Ga recovery, identifying optimal parameters: a temperature of 1000℃, a time of 60 min, and a carbon content of 40 wt%, a gas flow rate of 13 L·min⁻¹, and an oxygen content of 10 vol%. Under these conditions, 80.10 % Al and 73.52 % Ga were chlorinated. The quadratic model demonstrate superior performance in predicting both Al and Ga carbochlorination efficiencies (p < 0.0001). Phase characterization revealed that Ga, existing as isomorphic substitutions in aluminosilicate structures, participated in cooperative chlorination reactions with the aluminosilicate matrix. The Al-bearing phase decomposition facilitated Ga release during the phase transformation. This work elucidates the mechanistic for Al-Ga co-recovery from high-alumina fly ash and provides critical insights into the industrial implementation of high-alumina fly ash resource recovery.

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响应面法碳氯化协同回收高铝粉煤灰中的铝和镓

从高铝飞灰中协同提取关键元素（Al, Ga）在解决资源短缺和减轻环境影响方面得到了突出表现。本研究介绍了一种高效的碳氯化法，克服了传统酸/碱法能源需求过大和二次污染的缺点。采用响应面法对Al和Ga的回收率进行优化，确定最佳工艺参数为：温度1000℃，处理时间60 min，碳含量40 wt%，气体流速13 L·min−1，氧含量10 vol%。在此条件下，氯化率为80.10 % Al和73.52 % Ga。二次模型在预测Al和Ga的氯化效率方面表现出优异的性能（p <； 0.0001）。相表征表明，Ga以同形取代物的形式存在于铝硅酸盐结构中，参与了与铝硅酸盐基体的协同氯化反应。含al相分解有利于相变过程中Ga的释放。本研究阐明了高铝飞灰中铝镓共回收的机理，为高铝飞灰资源回收的工业实施提供了重要的见解。

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来源期刊

Waste management 环境科学-工程：环境

CiteScore

15.60

自引率

6.20%

发文量

492

审稿时长

39 days

期刊介绍： Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)