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A kind of preparation method of sulfide ore working electrode, working electrode and research method
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A technology of working electrode and sulfide ore, applied in the field of electrochemistry, can solve the problems of difficult to find bulk electrodes, difficult to measure sub-processes or steps, unrepresentative and so on
Active Publication Date: 2022-07-29
NORTHEASTERN UNIV LIAONING
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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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Embodiment 1
[0028] The research object of this embodiment is chalcopyrite, and the working electrode comprising chalcopyrite powder is prepared according to the following method:
[0029] (1) The chalcopyrite is made into 200 mesh chalcopyrite powder after pretreatment (ore dressing and impurity removal) and crushing and grinding.
[0030] (2) Select a suitable carbon powder type, the commercially available RC-69 high-purity conductive carbon black is used in this embodiment, and the carbon powder and the chalcopyrite powder are mixed at a ratio of 1:3.
[0031] (3) Add the binder PVDF to the mixed powder in step (2), stir to mix well.
[0032] (4) Add the fully mixed powder in step (3) to a tableting machine for compression, and the tableting die of the tableting machine has a diameter of 1 cm, and is compressed into a sheet electrode with a diameter of 1 cm.
[0033] (5) Putting the pressed sheet electrode in step (4) into a muffle furnace to cure the binder, and the curing conditions ...
Embodiment 2
[0052] The research object of this embodiment is arsenopyrite, and a working electrode comprising pyrite powder is prepared according to the following method:
[0053] (1) After the arsenopyrite is pretreated (ore dressing and impurity removal) and crushed and ground, 150 mesh arsenopyrite powder is made.
[0054] (2) Select a suitable carbon powder type (commercially available RC-69 high-purity conductive carbon black), and mix the carbon powder with the arsenopyrite powder at a ratio of 1:4.
[0055] (3) Add the binder PVDF to the mixed powder in step (2), stir to mix well.
[0056] (4) Add the fully mixed powder in step (3) to a tableting machine for compression, and the tableting die of the tableting machine has a diameter of 1 cm, and is compressed into a sheet electrode with a diameter of 1 cm.
[0057] (5) Putting the pressed sheet electrode in step (4) into a muffle furnace to cure the binder, and the curing conditions are 80° C. for 12 hours. After curing, the sheet...
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Abstract
The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of a sulfide ore working electrode used 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 working electrodes. Methods for the study of pressure leaching processes. It solves the problems of lack of devices and methods for measuring dynamic high temperature and high pressure electrochemical signals and the lack of representativeness of using natural bulk electrodes in the prior art. The sulfide ore working electrode is made of carbon powder and mineral powder mixed in a certain proportion and added with a binder (PVDF). Through the open circuit potential test, polarization curve test and AC impedance spectrum test technology, the electrochemical mechanism of chalcopyrite leaching at different temperatures is tested; with the help of AC impedance technology, the number of sub-processes in the leaching process can be distinguished, and the equivalent circuit simulation The kinetic parameters of each sub-process were obtained by methods such as the following methods, and the formation and growth mechanism of the passivation film on the chalcopyrite surface were 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 a sulfide ore working electrode. Methods for the study of pressure leaching processes. Background technique [0002] Sulfide ore such as chalcopyrite has a stable structure and is difficult to leaching 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 as the temperature increases, the stable area of chalcopyrite and the stable area of sulfur shri...
Claims
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