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Ultrasonic electro-oxidation of molybdenite decomposition new technology research

Author: JiaLiJuan
Tutor: ZhongHong
School: Central South University
Course: Chemical processes
Keywords: Molybdenite Electro-oxidation process Ultrasonic electro-oxidation process
CLC: TF046.2
Type: Master's thesis
Year: 2008
Downloads: 116
Quote: 1
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Abstract


Molybdenite roasting oxidation process there is a low resource utilization, metal recovery, the release of sulfur dioxide gas pollution of the environment and other defects, all-wet decomposition process operating conditions are harsh, oxidant consumption, transportation difficulties, cost high decomposition method is imperative to study the decomposition of molybdenite. Ultrasonic electro-oxidation process is the electro-oxidation process for the study, strengthen the ultrasonic field of electro-oxidation of the mineral decomposition process of organic combination, in order to fundamentally solve the drawbacks of existing technology, to achieve cleaner production and to enhance the comprehensive competitiveness of enterprises . Through the mechanism of electro-oxidation process, and the basis of the pilot study, we found the reasons for the low the electric oxidation process molybdenum leaching rate and current efficiency: the inert film generated on the surface of the electrode block the reaction proceeds. Ultrasonic micro jet can undermine or weaken the boundary layer, increase the speed of the mass transfer, destroy or dissolve the mineral surface passivation film and resistance film, expose the mineral surface, expand the reaction interface. The composite field (electric field ultrasonic field) to strengthen the diffusion of the product and leaching agent, peel, fast chemical dissolution or oxidation to destroy the inert film to promote the smooth conduct of the electrochemical reaction hui aluminum ore electro-oxidation leaching process. Stone electrode with a single factor and orthogonal experiments investigated the electrolyte concentration, liquid to solid ratio, pH and electrolysis voltage, electrolysis time ultrasonic electro-oxidation process, the ultrasonic electro-oxidation process decomposition of molybdenite most Jia process conditions: In the ultrasonic wave emitted for every 15min 3min, the electrolyte NaCl concentration of 20%, the initial pH of the slurry 10, the electrolytic voltage of 3.5V, the ore slurry to solid ratio L / S 50, electrolysis temperature of 25 ° C. Mo leaching rate and current efficiency conditions were as follows: 91.9% and 191.8%, respectively. By the experimental study found that The graphite electrode there is a energy consumption, easy to damage and other defects, the electrolyzer system design and optimization of the anode the optimized electrode to the DSA, made of stainless steel cathode in the new electrolysis system ultrasound electro-oxidation process conditions was further experimental research, reduce the voltage from 3.5 volts to 3.0 volts, the leaching of molybdenum from 91.9% up to 94.2%, the current efficiency increased to 196.5%. This paper describes the reasons for the high ultrasonic electro-oxidation process, and the current efficiency: ultrasonic cavitation can be further dispersed slurry, increase the active center of the liquid-solid reaction, electrolysis NaClO use efficiency increased; ultrasonic field under cover of sulfur film can easily be peeled off, and ultimately produced by electrolysis strong oxidants - NaClO oxidized into water; the pulp dissolved oxygen can be used as the oxidant in the leaching process of decomposition of molybdenite; pulp and mineral particles anode collision can cause direct anodic oxidation of molybdenite; ultrasonic cavitation generated strong oxidizing hydroxyl radical (· OH, φ 0 = 2.8 v) directly involved in the oxidative decomposition of the MOS 2 (ultrasonic energy to give, not taken into account in the calculation of the current efficiency of the ultrasonic power consumption consumption), while the reaction mechanism under ultrasonic irradiation.

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CLC: > Industrial Technology > Metallurgical Industry > General issues > Smelting of raw materials and ore pretreatment > Ore pretreatment, sintered pellets > Roasting, calcining
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