Zinc extraction from zinc oxidized ore using (NH4)2SO4 roasting−leaching process

Xiao-yi Shen; Hong-mei Shao; Ji-wen Ding; Yan Liu; Hui-min Gu; Yu-chun Zhai

doi:10.1007/s12613-020-2015-2

Volume 27 Issue 11

Nov. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(11): 1471-1481

Xiao-yi Shen, Hong-mei Shao, Ji-wen Ding, Yan Liu, Hui-min Gu, and Yu-chun Zhai, Zinc extraction from zinc oxidized ore using (NH₄)₂SO₄ roasting−leaching process, Int. J. Miner. Metall. Mater., 27(2020), No. 11, pp. 1471-1481. https://doi.org/10.1007/s12613-020-2015-2

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Xiao-yi Shen, Hong-mei Shao, Ji-wen Ding, Yan Liu, Hui-min Gu, and Yu-chun Zhai, Zinc extraction from zinc oxidized ore using (NH4)2SO4 roasting−leaching process, Int. J. Miner. Metall. Mater., 27(2020), No. 11, pp. 1471-1481. https://doi.org/10.1007/s12613-020-2015-2

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Research Article

Zinc extraction from zinc oxidized ore using (NH₄)₂SO₄ roasting−leaching process

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Corresponding author:
Xiao-yi Shen E-mail: shenxy@smm.neu.edu.cn
Received: 12 December 2019; Revised: 11 February 2020; Accepted: 12 February 2020; Available online: 20 February 2020

Abstract

Abstract

An improved method of (NH₄)₂SO₄ roasting followed by water leaching to utilize zinc oxidized ores was studied. The operating parameters were obtained by investigating the effects of the molar ratio of (NH₄)₂SO₄ to zinc, roasting temperature, and holding time on zinc extraction. The roasting process followed the chemical reaction control mechanism with the apparent activation energy value of 41.74 kJ·mol⁻¹. The transformation of mineral phases in roasting was identified by X-ray diffraction analysis combined with thermogravimetry–differential thermal analysis curves. The water leaching conditions, including the leaching temperature, leaching time, stirring velocity, and liquid-to-solid ratio, were discussed, and the leaching kinetics was studied. The reaction rate was obtained under outer diffusion without product layer control; the values of the apparent activation energy for two stages were 4.12 and 8.19 kJ·mol⁻¹. The maximum zinc extraction ratio reached 96% while the efficiency of iron extraction was approximately 32% under appropriate conditions. This work offers an effective method for the comprehensive use of zinc oxidized ores.
- zinc oxidized ore;
- ammonium sulfate roasting, water leaching;
- kinetics;
- mechanism;
- extraction ratio

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