Sulfide ore working electrode preparation method, working electrode and research method

Abstract

The invention belongs to the technical field of electrochemistry, and particularly relates to a preparation method of a sulfide ore working electrode for measuring an electrochemical signal under a sulfide ore pressure leaching process condition, the sulfide ore working electrode and a method for researching the sulfide ore pressure leaching process by applying the working electrode. The problems that in the prior art, devices and methods for measuring dynamic high-temperature and high-pressure electrochemical signals are lacked, and representativeness is lacked when a natural block electrode is used are solved. The sulfide ore working electrode is formed by pressing carbon powder and mineral powder which are mixed according to a certain proportion by adding an adhesive (PVDF). The chalcopyrite leaching electrochemical mechanism at different temperatures is tested through open-circuit potential testing, polarization curve testing and alternating-current impedance spectroscopy testing technologies; and the number of sub-processes in the leaching process can be distinguished by means of the alternating-current impedance technology, kinetic parameters of all the sub-processes are obtained through methods such as equivalent circuit simulation, and the forming and growing mechanism of the passive film on the surface of the chalcopyrite is determined.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of a sulfide ore working electrode for measuring electrochemical signals under pressure leaching process conditions of sulfide ore, a sulfide ore working electrode, and the application of the working electrode to sulfide ore A method for studying the pressure leaching process. Background technique [0002] Sulfide minerals such as chalcopyrite have a stable structure and are difficult to leach under normal temperature and pressure conditions. As an enhanced leaching method, pressure leaching has the advantages of high efficiency, no pollution, and short process, and has a very broad application prospect. [0003] Taking chalcopyrite as an example, it can be seen from the theoretically calculated potential-pH diagram that when the temperature rises, the stable zone of chalcopyrite and the stable zone of sulfur shrink, resulting in a small...

AI Technical Summary

Problems solved by technology

At present, most of the studies on the electrochemical mechanism of chalcopyrite are based on steady-state or quasi-steady-state DC electrochemical test technology, which makes it difficult to measure the sub-processes or steps of the overall process, and it is impossible to determine the time constant in the reaction process and capture the step-by-step dynamics. characteristics of learning

Moreover, due to the high temperature and high pressure conditions of pressure leaching, there are high requirements on the structure of the electrode, and the measurement and output of electrochemical signals become very difficult.

[0005] Usually, natural bulk electrodes are used for high-temperature and high-pressure electrochemical tests on sulfide ores such as chalcopyrite. However, natural bulk electrodes have the disadvantages of being difficult to find and not representative. Measuring the electrochemical signals of bulk electrodes (such as polarization curves and AC impedance spectra, etc.) cannot completely and truly obtain the electrochemical behavior in the leaching process under actual conditions

Therefore, the lack of devices and methods that can measure dynamic high-temperature and high-pressure electrochemical signals hinders the in-depth study of dynamic leaching behavior and mechanism during high-temperature and high-pressure pressure leaching.

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