Mineral phase and structure changes during roasting of fine-grained carbonaceous gold ores and their effects on gold leaching efficiency

Jin, Jianping; Han, Yuexin; Li, Hui; Huai, Yangyang; Peng, Yongjun; Gu, Xiaotian; Yang, Wei

doi:10.1016/j.cjche.2018.08.006

Cited by 32 publications

(17 citation statements)

References 25 publications

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“…(5) New phase formation stage: the size of metal particles formed in the early stage of new phase formation is very fine, the corresponding specific surface area is large, and the fine particles themselves have strong adsorption, which belongs to the thermodynamic instability system. Then, the "metal core" in the early stage makes the metal particles formed in the later stage continuously rearrange and pile up, and the crystal particles grow, finally forming a certain size of metal particle compounds [21][22][23][24][25].…”

Section: Cobalt and Iron Phase Transformation In The Segregation Roasmentioning

confidence: 99%

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Extraction of Cobalt and Iron from Refractory Co-Bearing Sulfur Concentrate

Xiao

Zhang

2020

Processes

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In this study, oxidizing roasting, segregation roasting, and magnetic separation are used to extract cobalt and iron from refractory Co-bearing sulfur concentrate. The Co-bearing sulfur concentrate containing 0.68% Co, 33.26% Fe, and 36.58% S was obtained from V-Ti magnetite in the Panxi area of China by flotation. Cobalt pyrite and linneite were the Co-bearing minerals, and the gangue minerals were mica, chlorite, feldspar, and calcite in Co-bearing sulfur concentrate. The results show that cobalt is transformed from Co-pyrite and linneite to a Co2FeO4-dominated new cobalt mineral phase, and iron is transformed from pyrite to Fe2O3 and an Fe3O4-dominated new iron mineral phase after oxidizing roasting. Cobalt changed from CoFe2O4 to a new cobalt mineral phase dominated by [Co] Fe solid solution, and iron changed from Fe2O3 to a new iron mineral phase dominated by metal Fe and Fe3O4 after segregation roasting. Cobalt concentrate with a cobalt grade of 15.15%, iron content of 71.22%, and cobalt recovery of 90.81% as well as iron concentrate with iron grade of 60.06%, cobalt content of 0.11%, and iron recovery of 76.23% are obtained. The main minerals in the cobalt concentrate are Fe, [Co]Fe, Fe3O4, and SiO2, and the main minerals in the iron concentrate are Fe3O4, FeO, Ca2Si2O4, and Ca2Al2O4.

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Section: Cobalt and Iron Phase Transformation In The Segregation Roasmentioning

confidence: 99%

“…Processes 2020, 8,200 15 of 18 the early stage makes the metal particles formed in the later stage continuously rearrange and pile up, and the crystal particles grow, finally forming a certain size of metal particle compounds [21][22][23][24][25].…”

Section: Cobalt and Iron Phase Transformation In The Segregation Roasmentioning

confidence: 99%

Extraction of Cobalt and Iron from Refractory Co-Bearing Sulfur Concentrate

Xiao

Zhang

2020

Processes

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“…In oxidation roasting, the carbonaceous substance and sulfide of the ore are oxidized and the gas produced by carbonate decomposition renders the ore loose and porous. It changes the crystal structure of the mineral and reduces the density of the ore, making it conducive to the diffusion of the leaching agent [8,10,11].…”

Section: Introductionmentioning

confidence: 99%

“…Many scholars have studied the chemical composition, structure, and extraction process of gold oxide minerals in detail [10,12,13]. Therefore, the technology for extracting gold after oxidation roasting pretreatment has gradually matured, and the extent of the extraction of gold is usually more than 90%.…”

Section: Introductionmentioning

confidence: 99%

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Oxidation Roasting of Fine-Grained Carbonaceous Gold Ore: The Effect of Aeration Rate

Xiao

Jin

et al. 2021

Minerals

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The oxidation roasting of carbon-bearing micro-fine gold can eliminate or weaken the robbing effect of carbonaceous materials and clay, and destroy the encapsulation of micro-fine gold. The micropores produced by gas escaping during the roasting process are conducive to the diffusion of leaching agents, thus enhancing the cyanide leaching of gold. In this paper, the influence of the aeration rate during roasting on the leaching rate of fine-grained carbonaceous gold ore and its mechanism were studied using thermodynamic calculations, crystal structure analysis, surface chemical groups and bonds analysis, microporous structure analysis, and surface morphology detection. Under suitable roasting conditions, the carbonaceous and pyrite in the ore are oxidized, while carbonate minerals such as dolomite and calcite as well as clay minerals are decomposed, and the gold-robbing materials lose their activity. The experimental results have theoretical and practical significance for the popularization and application of oxidation roasting technology of fine carbon-bearing gold ore.

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Kinetics of pyrite multi-step thermal decomposition in refractory gold sulphide concentrates

Ruan

Wang

Xiao

et al. 2021

J Therm Anal Calorim

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Mineral phase and structure changes during roasting of fine-grained carbonaceous gold ores and their effects on gold leaching efficiency

Abstract: Mineral phase and structure changes during roasting of fine-grained carbonaceous gold ores and their effects on gold leaching efficiency. Cjche (2018),

Cited by 32 publications

References 25 publications

Extraction of Cobalt and Iron from Refractory Co-Bearing Sulfur Concentrate

Extraction of Cobalt and Iron from Refractory Co-Bearing Sulfur Concentrate

Oxidation Roasting of Fine-Grained Carbonaceous Gold Ore: The Effect of Aeration Rate

Kinetics of pyrite multi-step thermal decomposition in refractory gold sulphide concentrates

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