Synergistic extraction and separation of valuable elements from high-alumina fly ash with carbochlorination method

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-11-01 DOI:10.1016/S1003-6326(24)66637-9

Long WANG , Xin-xin ZHAO , Zi-mu ZHANG , Ting-an ZHANG , Guo-zhi LÜ , Zhi-he DOU , Ai-chun ZHAO , Xi-yu ZHANG

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Abstract

A novel process was proposed for synergistic extraction and separation of valuable elements from high-alumina fly ash. A thermodynamic analysis revealed that to achieve effective carbochlorination, it is crucial to conduct carbochlorination of the fly ash within the temperature range from 700 to 1000 °C. The experimental results demonstrated that under the optimal conditions, the carbochlorination efficiency for Al, Si, Ca, Ti, and Mg exceeded 81.18%, 67.62%, 58.87%, 82.15%, and 59.53%, respectively. The XRD patterns indicated that Al and Si in the mullite phase (Al₆Si₂O₁₃) were chlorinated during the carbochlorination process, resulting in the formation of mullite mesophases (Al_4.75Si_1.25O_9.63 and Al_1.83Si_1.08O_4.85). After the carbochlorination process, Al was accumulated as AlCl₃ in the condenser, while SiCl₄ and TiCl₄ were enriched in the exhaust gas, and CaCl₂, MgCl₂, and unreacted oxides remained in the residue for further recycling.

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.