Co-recovery of manganese from pyrolusite and gold from carbonaceous gold ore using fluidized roasting coupling technology

Wu, Hao; Feng, Yali; Li, Haoran; Wang, Hongjun; Ju, Jinrong

doi:10.1016/j.cep.2019.107742

Cited by 17 publications

(9 citation statements)

References 27 publications

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“…Corecovery of manganese from pyrolusite and gold from carbonaceous gold ores was achieved by this process. e results indicated that the optimum leaching efficiency of 99.31% for manganese and 97.43% for gold could be attained under the conditions that the mass ratio of carbonaceous gold ores to pyrolusite was 2 : 3, the coroasting temperature was 1073.15 K, and the roasting time was 30 min [19]. e experimental result showed that the carbonaceous matters in the carbonaceous gold ores can be utilized under proper conditions.…”

Section: Introductionmentioning

confidence: 94%

Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology

Zhang

Song

Yin

et al. 2021

Journal of Chemistry

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Carbonaceous gold ores are difficult to treat because of the “preg-robbing” by carbonaceous matters and locking by minerals. Roasting is the most commonly used method that is useful in dealing with carbonaceous gold ores. In this study, flotation gold concentrates containing sulfides and carbonaceous matters were investigated to ascertain the reaction process and the matters’ transformation characteristics in different temperatures by vacuum roasting pretreatment. Calcine and volatile condensates were characterized with several techniques. In the process of vacuum roasting, the main chemical reactions were decomposition reaction and carbothermic reduction reactions of sulfide ores, carbothermic reduction reactions of SiO2, and thermal decomposition reactions of organic carbon. The bad effects of “preg-robbing” by carbonaceous matters were greatly weakened by the thermal decomposition and carbothermal reduction. The gold locking minerals were mainly removed by reduction reactions. The sulfides were removed in ways that did not produce SO2. The removal of sulfur and carbonaceous matters during the vacuum roasting process was 95.83% and 65.38%, respectively. Direct cyanidation of the calcine extracted from 2.13% to 88.37% of the gold content with a vacuum degree of 10 Pa and roasting from 25°C to 1,200°C for 30 min.

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Section: Introductionmentioning

confidence: 94%

Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology

Zhang

Song

Yin

et al. 2021

Journal of Chemistry

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“…Therefore, manganese extraction could be realized through water leaching. During the water leaching process, NH 4 Fe(SO 4 ) 2 could also be leached into solution, but the leaching process generated KFe 3 (SO 4 ) 2 (OH) 6 and Fe (OH) 3 precipitates, resulting in a less efficient leaching of iron. The ammonia gas released in the roasting process could be absorbed and regenerated into ammonium sulfate to be recycled for the roasting process.…”

Section: The Mechanism Analysismentioning

confidence: 99%

“…At present, there are two main reducing processes for pyrolusite: hydrometallurgical reduction and pyrometallurgical reduction 6 . Hydrometallurgical reduction is mainly accomplished in ore slurry by adding different reducing agents.…”

Section: Introductionmentioning

confidence: 99%

“…5 At present, there are two main reducing processes for pyrolusite: hydrometallurgical reduction and pyrometallurgical reduction. 6 Hydrometallurgical reduction is mainly accomplished in ore slurry by adding different reducing agents. Commonly used reducing agents are as follows: reductive minerals, including pyrite, 7 and galena 8 ; organic reducing agents, including walnut shell, 9 lactic acid, 10 herb residue, 11 manioc waste, 12 molasses, 13 methyl alcohol 14 sawdust, 15,16 and oxalic acid 17 ; and inorganic reducing agents, including pyritic, 18 sodium sulfite, 19 ferrous sulfate, 20 hydrogen peroxide, 21 and sulfur dioxide.…”

Section: Introductionmentioning

confidence: 99%

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An environmentally friendly approach for the extraction and recovery of Mn from pyrolusite by ammonium sulfate roasting‐water leaching and ammonium carbonate precipitation

Ma,

Feng,

et al. 2023

Asia-Pacific J Chem Eng

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With the growth of the new energy industry, the requirements for manganese have increased significantly. In this paper, the method of manganese extraction from pyrolusite using ammonium sulfate roasting and water leaching was presented. At the optimal process parameters: mass ratio of (NH4)2SO4 to pyrolusite of 2:1, the roasting temperature of 420°,C and duration of 120 min, the leaching efficiency of Mn and Fe was 94.55% and 54.38%, respectively. The mechanism analysis shows that MnO2 and Fe2O3 in pyrolusite were converted to (NH4)2Mn2(SO4)3, (NH4)3Fe(SO4)3, and NH4Fe(SO4)2 by roasting with ammonium sulfate. Iron was removed from the leaching solution with the addition of ammonia. Afterward, manganese carbonate products were prepared from iron‐free manganese sulfate solution by adding ammonium carbonate at a stirring duration of 60 min, a reaction temperature of 40°C, a pH of 7, and a molar ratio of ammonium carbonate to the manganese of 1.1:1, the precipitation efficiency of manganese could reach 99.8%, and the obtained manganese carbonate products were compliant with the industry standards. The ammonia released during the roasting process could be absorbed to regenerate (NH4)2SO4 and the final filtrate after evaporation and crystallization could be used to recycle (NH4)2SO4, both of which were used again into roasting process to reduce the consumption of raw material. In this process, the roasting temperature was only 420°C, which was significantly lower than the pyrometallurgical process suggested in earlier studies.

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“…Fine-grained carbonaceous gold ore is always enclosed by nonferrous minerals and is associated with carbonaceous matter and other gangue minerals. − Previous studies have validated the preg-robbing phenomenon, in which large amounts of gold are adsorbed on carbonaceous substances during the leaching process, such as the preg-robbing phenomena in the cyanidation of sulfide gold ores and the preg-robbing of gold from cyanide and noncyanide complexes. − Several studies have been conducted to reduce the adverse effects of inclusion and adsorption. Various utilization methods have realized engineering applications, such as oxidation roasting, bio-oxidation, flotation, pressure oxidation, and chemical oxidation. − Bio-oxidation is an eco-friendly method that has many advantages. A two-stage microbial process is used to destroy both sulfides and carbonaceous matter.…”

Section: Introductionmentioning

confidence: 99%

Pore Evolution in Refractory Gold Ore Formed by Oxidation Roasting and the Effect on the Cyanide Leaching Process

Zhi-hang

Jin

et al. 2022

ACS Omega

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Refractory gold ore is usually affected by the associated carbonaceous matter through the preg-robbing effect, which is eliminated by oxidation roasting, followed by leaching, to achieve a satisfactory gold leaching efficiency. Roasting− leaching experiments, pore structure measurements, scanning electron microscopy (SEM), and X-ray diffraction are used to explore the structural evolution of pores on the surface and its effect on the leaching performance. Pores with optimal sizes were obtained by roasting at 650 °C for 2.0 h with a ventilation of 0.6 m 3 /h; approximately 92.55% gold could be recovered under these conditions. A porous structure observed by SEM became more compact as the temperature further increased to 850 °C. The formation of CaSiO 3 and CaSO 4 in pores led to pore shrinkage. The mechanism of oxidation roasting, followed by cyanide leaching, was schematically analyzed and revealed the effects of pore structural evolution and phase transformation on the leaching efficiency.

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Co-recovery of manganese from pyrolusite and gold from carbonaceous gold ore using fluidized roasting coupling technology

Cited by 17 publications

References 27 publications

Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology

Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology

An environmentally friendly approach for the extraction and recovery of Mn from pyrolusite by ammonium sulfate roasting‐water leaching and ammonium carbonate precipitation

Pore Evolution in Refractory Gold Ore Formed by Oxidation Roasting and the Effect on the Cyanide Leaching Process

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