MgSO4 carbothermic reductive decomposition to produce a highly reactive MgO powder

Souza, Bruno José Olivieri de; Souza, Rodrigo Fernandes Magalhães de; Santos, Iranildes Daniel dos; Brocchi, E. A.

doi:10.1016/j.jmrt.2019.12.017

Cited by 11 publications

(4 citation statements)

References 19 publications

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“…Based on the reported literature, the sulfates of Mg and Ca are not supposed to decompose at event (c) [41,42]. The last event with the lowest mass loss reported tends to be associated with talc decomposition [17,43] as well as MgSO4 transformation into MgO [41,44].…”

Section: Roast-leach Experimentsmentioning

confidence: 99%

On the Cobalt Content Upgrade in Nickeliferous Laterites Using Iron (III) Sulfate: A Study Based on Thermodynamics Simulations

et al. 2022

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Nickel (Ni) and cobalt (Co) are relevant technological metals for the future of the lithium-ion battery (LIB) industry. Based on the current and projected demand for these, an increased interest in developing processing routes to exploit lateritic occurrences has been observed, as these are reported as critical raw materials for future mineral–metallurgical industry. However, the content of Ni and Co in such ores is minimal and requires impracticable mineral-processing operations for concentration before metal extraction. It was identified that information regarding the sulfation roasting of this material is scarce on what concerns the iron sulfates interaction as a function of the temperature. Based on that context, the present work has its purposes associated with the proposition of an alternative chemical pretreatment to upgrade the content of metals of technological interest in lateritic ores through a simple roast–leach process. Thus, the chemical interactions between the mineral sample and iron (III) sulfate (Fe2(SO4)3) through thermodynamic simulations and experimental procedures were explored. The latter included specific water leaching practices for the selective concentration of metals. The equilibrium calculations indicate that Fe2(SO4)3 and FeSO4 tend to decompose at lower temperatures, and considering the higher stability of other metal sulfates, it could be an interesting reagent in this type of process. Regarding the experimental results, the characterization of materials indicates a recovery of Co as high as 73.4 wt.% after sulfation roasting at 500 °C followed by water leaching, with the full content of Iron (Fe) being reported in the insoluble phase. Based on these findings, the present development could be an interesting alternative to consider within operations for the chemical upgrade of cobalt in such types of mineralogical occurrences.

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Section: Roast-leach Experimentsmentioning

confidence: 99%

On the Cobalt Content Upgrade in Nickeliferous Laterites Using Iron (III) Sulfate: A Study Based on Thermodynamics Simulations

et al. 2022

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“…Thermogravimetric analyzes were carried out with only Pd/Al 2 O 3 catalyst as well as with the anhydrous magnesium sulfate with and without the presence of the catalyst. Souza et al 37 showed that the mass loss of the seven water molecules of the magnesium sulfate heptahydrate occurs between 100 °C and 350 °C. Therefore, the TGA results are presented above 400 °C for a better level of detail.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

“…Over the years, under a different perspective, the thermal decomposition of magnesium sulfate has already been applied to aim the production of sulfur dioxide, for sulfuric acid manufacturing, and magnesium oxide, as a neutralizing agent, for pH control during other sulfates precipitation as well as for heat storage unit operations [29][30][31][32] . Moreover, the decomposition of this salt has been continuously studied throughout the last decades, under different reaction conditions, such as atmosphere composition and presence of a reducing agent 26,31,[33][34][35][36][37] ; to optimize the process in terms of the oxide particle size by lowering the decomposition temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of an Alumina Supported Palladium Catalyst on the Magnesium Sulfate Decomposition Kinetics

et al. 2020

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The sulfur related thermochemical water-splitting cycles are an important class of chemical processes considered for hydrogen production. Recently, the magnesium sulfate thermal decomposition has been reported as a potential unit operation in one of these cycles. Therefore, some interest has been observed in the use of catalysts to lower the activation energy of such reactions. In this context, the present manuscript reports the thermodynamics and kinetics modeling results associated with this reaction system in the presence of a Pd catalyst supported over γ-Al 2 O 3 . The presence of such species is responsible for shifting the decomposition temperature to lower values in at least 100 °C. It was observed that the magnesium content is still oriented towards MgO formation. The obtained results indicate that the Pd/Al 2 O 3 catalyst could be a good alternative in reducing the thermal decomposition temperature as its presence was responsible for diminishing the process activation energy from 368.2 to 258.8 kJ.mol −1 .

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“…Assim sendo, estudos vêm sendo desenvolvidos para atingir tal objetivo. A principal alternativa considerada está associada com a possibilidade de modificação da atmosfera reacional via presença de agentes modificadores como C, H 2 (g), CO(g), S 2 (g) (SCHEIDEMA,2011a;SCHEIDEMA,2011b;SCHEIDEMA,2015;SOUZA et al 2020;CARDOSO,2018;PHADNIS et al,1981;PLEWA et al,1987 ;OKHRIMENKO et al 2020).…”

Section: Contextounclassified

Simulação Termodinâmica E Modelagem Cinética Do Processo De Decomposição De Sulfatos Com Diferentes Níveis De Estabilidade Térmica Na Presença De Catalisadores

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MgSO4 carbothermic reductive decomposition to produce a highly reactive MgO powder

Cited by 11 publications

References 19 publications

On the Cobalt Content Upgrade in Nickeliferous Laterites Using Iron (III) Sulfate: A Study Based on Thermodynamics Simulations

On the Cobalt Content Upgrade in Nickeliferous Laterites Using Iron (III) Sulfate: A Study Based on Thermodynamics Simulations

Effect of an Alumina Supported Palladium Catalyst on the Magnesium Sulfate Decomposition Kinetics

Simulação Termodinâmica E Modelagem Cinética Do Processo De Decomposição De Sulfatos Com Diferentes Níveis De Estabilidade Térmica Na Presença De Catalisadores

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