Dissolution behavior and improvement approach for gallium extraction from zinc refinery residues

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

Transactions of Nonferrous Metals Society of China Pub Date : 2024-03-01 DOI:10.1016/S1003-6326(23)66450-7

Wei ZHANG , Shuai RAO , Li-qing LI , Xiao-dan GONG , Cai-gui WU , Dong-feng HU , Hong-yang CAO , Zhi-qiang LIU

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Abstract

Aiming at solving low Ga leaching efficiency during actual industrial production in Danxia Smelter, chemical composition, phases and morphologies of various zinc refinery residues were characterized using ICP−AES, XRD and SEM−EDS. Compared with the normal material, Ga was embedded in the jarosite phase from the special zinc refinery residue, causing difficulty in Ga leaching. During the oxidation pressure leaching, the dissolution behaviors of Ga, As and Fe presented similar variation tendency. Namely, a sufficient H₂SO₄ concentration and liquid-to-solid ratio promoted the dissolution of Ga, Fe and As, whereas higher reaction temperature and oxygen partial pressure weakened the leaching. Based on the results, leaching parameters were optimized for enhancing Ga recovery. Through weakening the 1st oxidation pressure leaching (by decreasing reaction temperature and total pressure to 90 °C and 0.2 MPa, respectively) and strengthening the 3rd atmospheric leaching (by increasing H₂SO₄ concentration and reaction temperature to 160 g/L and 85 °C, respectively), the leaching efficiency of Ga increased from 77.83% to 96.46%.

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从炼锌厂残渣中提取镓的溶解行为和改进方法

为解决丹霞冶炼厂实际工业生产过程中镓浸出效率低的问题，利用 ICP-AES、XRD 和 SEM-EDS 对各种锌精炼渣的化学成分、物相和形态进行了表征。与普通材料相比，特殊炼锌渣中的镓被包裹在硬玉相中，给镓的浸出带来了困难。在氧化压力浸出过程中，镓、砷和铁的溶解行为呈现出相似的变化趋势。也就是说，足够的 H2SO4 浓度和液固比促进了 Ga、Fe 和 As 的溶出，而较高的反应温度和氧分压则削弱了浸出。根据结果，对浸出参数进行了优化，以提高镓的回收率。通过减弱第 1 次氧化压力浸出（将反应温度和总压力分别降至 90 ℃ 和 0.2 MPa）和加强第 3 次大气浸出（将 H2SO4 浓度和反应温度分别增至 160 g/L 和 85 ℃），镓的浸出效率从 77.83% 提高到 96.46%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.

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