Study on Process and Kinetics of Oxygen-Pressure Water Leaching of Molybdenite Concentrate
Orthogonal experiments were used to determine the optimal process conditions for oxygen-pres-sure water leaching of molybdenite concentrate,and the kinetics study of MoS2 oxidative decomposition re-action during oxygen-pressure water leaching was carried out under the optimal process conditions.The re-sults show that under the optimal conditions of ore particle size D90=46 μm,oxygen pressure of 1.1 MPa,temperature of 230 ℃,liquid-solid ratio of 7∶1,and reaction time of 1 h,the highest molybdenum conver-sion ratio can reach 99.77％,with the copper leaching ratio of 97.56％,and the iron leaching ratio of 88.71％.Within the leaching temperature range of 170～230 ℃(other process conditions are set at the above-mentioned optimal values),the oxidative decomposition reaction of MoS2 in molybdenite concentrate follows the unreacted nucleus shrinking model and is primarily controlled by chemical reaction with an apparent activation energy of 45.71 kJ/mol.
molybdenite concentrateoxygen-pressure water leachingoxidative decomposition of MoS2orthogonal experimentkinetics
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