Influence of tartrate on leaching interface of low-grade polymetallic complex chalcopyrite ore

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

Transactions of Nonferrous Metals Society of China Pub Date : 2024-12-01 DOI:10.1016/S1003-6326(24)66657-4

Xin-Jie LIU, Ya-long LIAO, Qing-feng LIU, Min WU

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Abstract

The leaching of Cu from low-grade polymetallic complex chalcopyrite ore (LPCCO) in acidic ferric electrolyte was increased by adding tartrate. To explain the reason resulting in this phenomenon, a systematical study about the effects of tartrate on the interfaces where reactions occurred was conducted by using electrochemical methods. The Mott−Schottky experiment results showed that whether tartrate was added or not, the initial n-type LPCCO surface transformed to the surface with a p−n junction that seriously hindered charge transfer. After adding tartrate, a shorter Debye length and higher charge carrier density were obtained, which were related to the decrease in intergranular energy barrier height by tartrate's bridging semiconductor particles. Additionally, EIS results combined with Tafel and LSV analysis revealed thin passive film and double-layer, large diffusion coefficient, and low apparent activation energy. These favorable changes in interface properties facilitated the LPCCO dissolution.

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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.