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Clean production method for high-purity cobaltosic oxide powder

A technology of tricobalt tetroxide powder and tricobalt tetroxide, which is applied in electrolysis process, electrolysis components, etc., to achieve the effects of low production cost and energy consumption, simple equipment and good dispersion

Inactive Publication Date: 2009-09-09
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are no institutions and enterprises in China to apply this method to industry

Method used

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  • Clean production method for high-purity cobaltosic oxide powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare an electrolyte containing 0.2 mol / L of cobalt chloride, 0.25 mol / L of potassium dihydrogen phosphate, and 0.03 mol / L of ammonium chloride, and adjust the pH value to 5 with 0.01 mol / L of potassium hydroxide; put the electrolyte into In the electrolytic cell, connect the metal cobalt sheet anode and cathode into the circuit; control the cathode current density to 500A / m 2 , Electrodeposition for 2 hours; filter the electrolyte, the supernatant does not need to be treated, it can be directly returned to the electrolytic cell for repeated use, while the precipitate is fully washed with deionized water, dried at 100°C and placed in a high-temperature furnace at 600°C Calcined at lower temperature for 5 hours to obtain superfine black cobalt tetroxide powder with an average particle size of 1.24 μm.

Embodiment 2

[0030] Prepare an electrolyte containing 0.3 mol / L of cobalt sulfate, 0.08 mol / L of citric acid, and 0.15 mol / L of boric acid, adjust the pH value to 4.5 with ammonia water; put the electrolyte into the electrolytic cell, connect the metal cobalt sheet anode and cathode into the circuit; control the cathode current density to 1000A / m 2 , Electrodeposition for 3 hours; filter the electrolyte, the supernatant does not need to be treated, it can be directly returned to the electrolytic cell for repeated use, while the precipitate is fully washed with deionized water, dried at 150°C and placed in a high-temperature furnace at 300°C Calcined at lower temperature for 2 hours to obtain superfine black cobalt tetroxide powder with an average particle size of 7.49 μm.

Embodiment 3

[0032] Prepare a mixed solution containing cobalt nitrate and cobalt chloride, the total concentration of cobalt salt is 0.45mol / L, the molar ratio of cobalt nitrate and cobalt chloride is 2:3, then add tartaric acid, its concentration is 0.25mol / L, use ammonia water Adjust the pH value to 5; put the electrolyte into the electrolytic cell, connect the metal cobalt sheet anode and cathode into the circuit; control the cathode current density to 1000A / m 2 , electrodeposited for 5 hours; the electrolyte was filtered, the supernatant was directly returned to the electrolytic cell without treatment, and reused, while the precipitate was fully washed with deionized water, dried at 130°C and placed in a high-temperature furnace at 800°C Calcined at lower temperature for 2 hours to obtain superfine black cobalt tetroxide powder with an average particle size of 20.56 μm.

[0033] In a word, the additives added when configuring the electrolytic solution containing cobalt ions in the pre...

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Abstract

The invention discloses a clean production method for high-purity cobaltosic oxide powder. The method comprises the following steps: using metal cobalt as an electrolytic anode, using soluble cobalt salt as electrolyte main salt and adding additives; adopting an electrochemical method to prepare a cobaltosic oxide precursor sediment; and then, drying and calcining the precursor sediment to obtain the cobaltosic oxide powder. The cobaltosic oxide powder produced by the method and the process can achieve the purity more than 99.7 percent, no additional precipitator is needed in the whole technological process, the added additives are all easy to wash without decomposition, and electrolyte and washing water can be recycled so as to avoid discharging sewage and generating waste gas. The method can adjust and control the appearance and the grain diameter distribution of the cobaltosic oxide powder by controlling the composition of the electrolyte, the cathode current concentration, the electrodeposition time and the calcining temperature and has the advantages of high product quality, simple production procedures, energy saving, environmental protection, and the like.

Description

technical field [0001] The invention relates to a clean production method of high-purity cobalt tetroxide powder, which belongs to the technical field of chemical industry. Background technique [0002] Cobalt tetroxide is the raw material for the production of lithium cobalt oxide, the cathode material of lithium-ion batteries. At present, lithium cobalt oxide accounts for nearly 80% of the lithium-ion battery market. Among high-end products, lithium cobalt oxide has an absolute advantage, and cobalt oxide is widely used It is widely used in cemented carbide, high temperature resistant alloy, magnetic material, catalyst and other fields. [0003] At present, the main methods for preparing cobalt tetroxide powder are: chemical precipitation-thermal decomposition method, direct thermal decomposition method of cobalt salt, spray roasting of cobalt salt solution, etc. These preparation methods have their own characteristics, but there are certain deficiencies. [0004] (1) Ch...

Claims

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Application Information

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IPC IPC(8): C25B1/00
Inventor 陈范才李文军陈良木胡小冬吴道明徐超王子天
Owner HUNAN UNIV
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