The depression mechanism on pyrite in a low-alkaline system with combined depressants: Experiment, HSC, DFT and ToF-SIMS studies

被引:2
作者
Li, Suqi [1 ]
Yuan, Jiaqiao [1 ]
Ding, Zhan [1 ]
Li, Jie [1 ]
Yu, Anmei [1 ]
Wen, Shuming [1 ,2 ,3 ]
Bai, Shaojun [1 ,2 ,3 ]
机构
[1] Kunming Univ Sci & Technol, Fac Land Resource Engn, Kunming 650093, Yunnan, Peoples R China
[2] Kunming Univ Sci & Technol, State Key Lab Complex Nonferrous Met Resources Cle, Kunming 650093, Peoples R China
[3] Yunnan Key Lab Green Separat & Enrichment Strateg, Kunming 650093, Peoples R China
来源
PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING | 2023年 / 59卷 / 03期
基金
中国国家自然科学基金;
关键词
pyrite; calcium hypochlorite; lime; depression; low alkaline system; FLOTATION SEPARATION; CHALCOPYRITE FLOTATION; CALCIUM HYPOCHLORITE; UNAVOIDABLE IONS; ACTIVATION; XANTHATE; SULFIDE; LEAD; PH; SURFACE;
D O I
10.37190/ppmp/168454
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Depression of pyrite in a low-alkaline system has sparked soaring interests for the multi-metal sulfide minerals flotation recently. This study investigates effects of combined depressants (Ca(ClO)2 and CaO) on pyrite flotation with butyl xanthate (KBX). Micro-flotation experiments indicate that the addition of 200 mg/L combined depressants (a mass ratios of CaO to Ca(ClO)2 of 2:3) and 1.0x10-3 mol/L KBX at pH 9.5 can effectively depresses the flotation of pyrite, and a minimum pyrite recovery rate of 12.5% is obtained. Basic thermodynamic evaluation results confirm the participation of Ca(ClO)2 significantly decrease the negative Gibbs free energies of pyrite oxidation reaction. Besides, the calcium species (Ca(OH)2, Ca2+ and Ca(Cl)2) will spontaneously transform into CaCO3,and it is the ultimate dominant calcium species in the CO32-system. Density functional theory (DFT) results indicate that CaCO3 can chemically adsorb onto the pyrite surface with an adsorption energy of -671.13 kJ/mol. The O1 and Ca atoms mainly contribute to the bonding process and are responsible for the stable adsorption of CaCO3. ToF-SIMS results provide strong evidence that the combined depressants increase the amount of hydrophilic species and decrease dixanthogen adsorption onto the pyrite surface. The thickness of the whole formed hydrophilic species is approximately 50 nm. Semiquantitative amounts of hydrophilic species follow the order of hydroxy calcium>iron carbonyl>calcium carbonate. Overall, hydrophilic species repulse adsorption of dixanthogen and significantly reduce the flotation performance of pyrite.
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页数:15
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