Thermodynamic analyses performed in the present work show that the process of the water vapour oxidation of molybdenum sulphide concentrates can be efficient. The calculations indicate a temperature of 900-1000uC and a mass ratio of water vapour to concentrate (H 2 O/MoS 2 ) of 6-8 as the optimum conditions for complete desulphurisation of molybdenum concentrate with the recovery of entire molybdenum and rhenium in the solid product and selenium and tellurium in the gas phase.
A thermodynamic and kinetics investigation on the oxidation of MoS 2 in molybdenite concentrate to MoO 2 by water vapor was carried out as part of new process development. The kinetics of the reaction were determined by measuring the weight change of a sample with time in water vapor at temperatures between 700°C and 1000°C. The reaction rate followed the shrinking-unreacted-core model under chemical reaction control, which showed activation energy of 102 kJ/mol. In addition, the behavior of rhenium and selenium in molybdenum concentrate during the process was investigated. While most rhenium remained with the molybdenum dioxide during the water vapor oxidation, almost all selenium was volatilized in agreement with thermodynamic analysis.
The oxidation of molybdenum sulphide concentrate by water vapour at high temperatures has been investigated experimentally. The progress of the reaction was followed by a thermogravimetric analysis unit and the exit gas was analysed to determine its composition. The conditions under which the water vapour oxidation process takes place without forming volatile molybdenum oxides have been determined.
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