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考察了辉钼精矿在电解NaCl溶液环境下的氧化行为及超声波对氧化浸出过程的影响.结果表明:无超声场强化时浸出表观活化能Ea较小,仅为19.7 kJ/mol,浸出过程是固膜扩散控制,浸出过程中生成的硫会形成强疏水性的致密硫膜,尤其是在堆积密度高的矿物基面上,会阻止氧化反应的进一步进行,对未反应完全的MoS2起保护作用.在无超声波的浸出过程中,浸出4 h Mo的浸出率为88%,采用超声场强化浸出过程,可以加快和强化辉钼矿的氧化分解,超声波每隔10 min发射5 min,液固比20,搅拌速度500 r/min,浸出温度40℃,NaCl浓度4 mol/L,pH为9(初始),浸出时间4 h的条件下,Mo浸出率可以达到99.6%.
The effect of ultrasonic wave on the leaching process of molybdenite concentrate in electrolysis NaCl solution was investigated. The results showed that the apparent activation energy Ea of the leaching molybdenum concentrate without electrolysis was only 19.7 kJ / mol, and the leaching process Is the diffusion control of the solid film. The sulfur generated in the leaching process will form a strongly hydrophobic dense sulfur film, especially on the mineral bulk surface with high bulk density, which will prevent further oxidation reaction and protect the unreacted MoS2 completely In the process of ultrasonic leaching, the leaching rate of Mo was 88% after leaching for 4 h, and the ultrasonic leaching process could accelerate and intensify the oxidative decomposition of molybdenite. The ultrasonic wave was emitted for 5 min every 10 min, The results showed that the leaching rate of Mo was 99.6% under the conditions of stirring speed 500 r / min, leaching temperature 40 ℃, NaCl concentration 4 mol / L, pH 9 (initial) and leaching time 4 h.