Thermodynamic modelling of roasting of molybdenum sulphide concentrate with calcium hydroxide
https://doi.org/10.21285/1814-3520-2021-6-773-781
Abstract
This work aims to determine the conditions for the CaMoO4, CaSO4, Ca(ReO4)2 formation during oxidation of MoS2 and ReS2 in the presence of Ca(ОН)2. The concentrate from the Yuzhno-Shameyskoye deposit in the Sverdlovsk region, having 37% wt. Мо and 0.005% wt. Re, was selected as a feedstock for thermodynamic modelling of sweet roasting in the presence of Ca(OH)2. To determine the optimal amount of calcium-containing additives, the thermodynamic modelling was carried out using the following mass ratios: molybdenum concentrate: Ca(OH)2 = 1:0.8, 1:1, 1:1.2 and 1:1.5 in the temperature range of 100–800°С, with a step of 100°С, system pressure of 0.1 MPa in the air (molar ratio: molybdenum concentrate + Ca(OH)2: air = 1:5). The content of all sample components in moles was entered into the HSC 6.1 software package. The main reactions associated with the sweet roasting of molybdenum concentrate in the presence of calcium hydroxide were shown. It was established that the main phases formed as a result of roasting comprise CaSO4, CaSO3, MoO3, CaMoO4, CaMoO3 and CaReO4. The effect of temperature on the formation of the main gaseous products was studied under different mass ratios of molybdenum concentrate and Ca(OH)2. It was found that up to 600°C, with molybdenum concentrate to Ca(OH)2 ratio of 1:1, the concentrations of released sulphurous anhydride are lower than the maximum permissible concentrations. The calculated thermodynamic data was used for modelling the roasting process of molybdenum concentrate with calcium hydroxide. An optimal ratio necessary for the successful process operation was established: molybdenum concentrate: Ca(OH)2 = 1:1 by weight. Thermodynamic modelling showed that, in the temperature range of 100–600°С when using Ca(OH)2, no rhenium and molybdenum loss is observed, the release of sulfur is less than 10 mg/m3.
About the Authors
D. S. Aleshin
Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
Dmitriy S. Aleshin, Postgraduate student, Junior Researcher of the Laboratory of Heterogeneous Processes
101, Amundsen St., Yekaterinburg 620016, Russia
A. G. Krasheninin
Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
Aleksey G. Krasheninin, Cand. Sci. (Eng.), Leading Researcher of the Laboratory of Heterogeneous Processes
101, Amundsen St., Yekaterinburg 620016, Russia
P. V. Zaitseva
Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
Polina V. Zaitseva, Cand. Sci. (Chem.), Senior Researcher of the Laboratory of Analytical Chemistry
101, Amundsen St., Yekaterinburg 620016, Russia
I. N. Tanutrov
Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
Igor. N. Tanutrov, Dr. Sci. (Eng.), Chief Researcher of the Laboratory of Heterogeneous Processes
101, Amundsen St., Yekaterinburg 620016, Russia
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Review
For citations:
Aleshin D.S., Krasheninin A.G., Zaitseva P.V., Tanutrov I.N. Thermodynamic modelling of roasting of molybdenum sulphide concentrate with calcium hydroxide. iPolytech Journal. 2021;25(6):773-781. (In Russ.) https://doi.org/10.21285/1814-3520-2021-6-773-781
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