A novel approach for metal extraction from metal sulfide ores with NH4Cl: A combined DFT and experimental studies

Xiong, Xiaolu; Sun, Chenteng; Li, Guangshi; Yu, Caixiang; Xu, Qian; Zou, Xingli; Cheng, Hongwei; Zhu, Kai; Li, Shenggang; Lu, Xionggang

doi:10.1016/j.seppur.2021.118626

Cited by 9 publications

(1 citation statement)

References 37 publications

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“…The roasting process with chloride salts, namely KCl, NaCl, CaCl 2 , and NH 4 Cl, is one of the alternative pyrometallurgical techniques for extracting metals from sulphidic ores/concentrates. Salt roasting is an up-and-coming pretreatment annealing process for raw materials of ores and concentrates [7][8][9][10][11][12][13][14][15][16][17]. The treatment of concentrate containing sulphide and oxidized copper minerals by roasting with additives followed by acid leaching technique is a high copper recovery (96.2%) and no SO 2 emission under optimal conditions [18,19].…”

Section: Introductionmentioning

confidence: 99%

Copper Recovery from Chalcopyrite Concentrate by Oxidative Roasting and Acid Leaching

Tumen-Ulzii

Ariunaa

SILAM

et al. 2022

Int.J.Soc.Mater.Eng.Resour.

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In this study, a combined process consisting of salt roasting and acid leaching was conducted to recover copper per sulphide concentrate with 43.5% of chalcopyrite. The chalcopyrite concentrate was roasted in the absence and the presence of potassium chloride (mass ratio of concentrate:KCl from 1:0.5 to 1:0.9) at various temperatures (400-600°C) and different roasting times (1-4 hours) under air atmosphere. The roasted concentrate was dissolved in sulphuric acid solution (60 g/L) with a solid-liquid ratio of 1:8 at an ambient temperature for 2 hours. The chalcopyrite concentrate, roasted samples, and leached residues were analyzed using atomic absorption spectrometry, UV-VIS spectrophotometer, and X-ray diffractometer. Thermogravimetry and diff erential thermal analyses were applied on the chalcopyrite concentrate and the concentrate with KCl up to 1000°C. Results showed that about 80% and 90% of chalcopyrite decomposed under the conditions with the copper concentrate:KCl ratio of 1:0.6, roasting time of 2 hours at 500°C and 550°C, respectively. The DTA-TG analyses revealed variant phase regions associated with chalcopyrite decomposition through the roasting. Copper dissolution with the sulphuric acid solution from the roasted concentrates was over 99.7% and 99.0% under the determined conditions. The thermodynamic stability of chalcopyrite with KCl was discussed by calculating Gibb's free energy.

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