Leaching of Molybdenite by Hydrochloric Acid Solution Containing Sodium Chlorate

Nguyen, Thi Nhan Hau; Nguyen, Thi Thu Huong; Lee, Man Seung

doi:10.7844/kirr.2022.31.5.26

Cited by 3 publications

(3 citation statements)

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“…Molybdenum is regarded as one of the key metals in Republic of Korea due to its high melting point, high strength at high temperatures, high thermal conductivity, and adequate resistance to corrosion [1,2]. Although there is an operating molybdenum mine in Republic of Korea, the self-sufficiency ratio of molybdenum in Republic of Korea remains under 2% [1].…”

Section: Introductionmentioning

confidence: 99%

The Self-Reduction during the Thermal Decomposition of an Ammonium Molybdate

et al. 2023

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In the hydrometallurgical process of molybdenum using ammonia solution, ammonium paramolybdate tetrahydrate (APT: (NH4)6Mo7O24·4H2O) is produced as an intermediate product after a crystallization step. ATP is then thermally decomposed at a high temperature to give MoO3, which is reduced by hydrogen gas in a two-stage process to reduce molybdenum metal powder as the final product. If APT is pre-dried at an appropriately low temperature to remove the crystal water corresponding to 4 mol per mol of APT, it changes into (NH4)4Mo5O17, and the content of residual ammonia, which can be utilized as a reductant, in the ammonium molybdate increases. In this regard, the self-reducing potential of (NH4)4Mo5O17 was examined in this study through the effectiveness analysis of the residual ammonia component as a reductant for the primary hydrogen reduction step. In a series of experimental work on the thermal decomposition of (NH4)4Mo5O17 in an inert atmosphere, a maximum self-reduction degree of 18% was achieved. Based on this result, it can be expected that the metal powder can be manufactured in a more effective way than conventional processes in terms of hydrogen consumption and reaction time.

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Section: Introductionmentioning

confidence: 99%

The Self-Reduction during the Thermal Decomposition of an Ammonium Molybdate

et al. 2023

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“…Therefore, a good management method is needed for the tremendous increase in the volume of industrial waste. Aluminum dross had been utilized via several processes and can be classified into wet, dry, and without process [14][15][16][17][18][19][20][21][22][23][24]. The wet process was carried out using acid and base leaching for Al recovery [15], absorbent/catalyst [16,17], and alumina [18,19] productions.…”

Section: Introductionmentioning

confidence: 99%

“…Aluminum dross had been utilized via several processes and can be classified into wet, dry, and without process [14][15][16][17][18][19][20][21][22][23][24]. The wet process was carried out using acid and base leaching for Al recovery [15], absorbent/catalyst [16,17], and alumina [18,19] productions. The dry process was conducted by heating at a temperature above 1000 • C for the production of composite [20], refractory [21], and hercynite [22].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ferroalloys via Mill Scale-Dross-Graphite Interaction: Implication for Industrial Wastes Upcycling

Wongsawan¹,

Srichaisiriwech²,

Kongkarat³

2022

Metals

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Mill scale and aluminum dross are the industrial wastes from steel and aluminum industries, which have high concentrations of Fe2O3 and Al2O3, respectively. This paper reports the conversion of reducible metal oxides in scale and dross into an alloy via carbothermic reduction at 1550 °C. Scale and dross were mixed with graphite into three different C/O molar ratios of 1, 1.5, and 2 to produce a pellet. The pellets were heated at 1550 °C for up to 6 h under an argon atmosphere. By this method, carbothermic reductions were found to proceed and formed Fe–Si–Al–C alloy that consists of Fe3Al and Fe3Si phases. The presence of Si in the alloy came from the reduction of SiO2 in aluminum dross. Levels of Al and Si in the alloy increase with increasing C/O molar ratios. However, the Si level in the alloy was found to stabilize since 3 h, while the Al level increases with increasing time up to 6 h. Unreacted oxides in the wastes had an insignificant effect on the ferroalloy formation. These results provide evidence for carbothermic reduction of the Fe2O3-Al2O3-SiO2 system at 1550 °C and show the novel method to upcycling aluminum dross and mill scale toward a circular economy.

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