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Process for preparing Co3O4

A technology of cobalt tetroxide and a manufacturing method, which is applied in the field of inorganic material manufacturing, can solve the problems of difficult control of the synthesis process, complicated process and large investment, and achieves the effects of easy production control, simple process and high density

Inactive Publication Date: 2004-06-02
戴振华
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Another example is the method disclosed in the Japanese patent "Manufacturing method of tricobalt tetroxide" (JP-11-292548) by co-currently synthesizing cobalt hydroxide and calcining cobalt hydroxide to prepare cobalt tetraoxide.

Method used

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preparation example Construction

[0025] 3. Preparation of cobalt salt

[0026] Add the prepared cobalt solution into a reactor equipped with a thermometer and a stirrer, adjust the PH=4.0-5.5, and add a complex precipitation agent at 35°C-100°C under stirring conditions, and the end point of the reaction PH value is between 7.0-8.0.

[0027] 4. Filter the cobalt salt slurry and wash it with deionized water ≥90°C.

[0028] 5. Drying and pulverizing the cobalt salt or directly placing the washed cobalt salt in a calcining furnace with adjustable air atmosphere, calcining at a temperature of 300-1000°C for 5-25 hours, and pulverizing and grading to obtain cobalt tetroxide.

[0029] Cobalt tetroxide produced by the invention has a Co content of 73.0-74.0% and a loose packing density of 0.7-1.4g / cm 3 , Tap density ≥2.0g / cm 3 , The average particle diameter under a 4500x electron microscope is 1-10μm, and the spinel structure is based on the requirements of lithium cobalt oxide. The chemical composition and physical pr...

example 1

[0032] Example 1. Dissolve metallic cobalt in nitric acid, the cobalt content of the cobalt nitrate solution is 60g / l, and dissolve ammonium bicarbonate and EDTA in deionized water to prepare a complex precipitation agent. The dosage is: Co:NH 4 HCO 3 :EDTA=1:2.5:0.3 (mole), take 200 liters of the above cobalt nitrate solution and add it to the reactor equipped with a stirrer and thermometer. Under stirring conditions, add the prepared complex precipitation agent to the reactor at a temperature of 45°C reaction. The reaction is ended when PH=7.2, the precipitated cobalt salt is filtered, washed 7 times with deionized water greater than 90°C, placed in a calciner at a temperature of 300°-1000°C, calcined for 14 hours, pulverized and classified, the Co content of cobalt tetroxide is 73.6 %, loose density 1.0g / cm 3 , Tap density 2.6g / cm 3 , 4500 times the average particle diameter of 3μm under the electron microscope.

example 2

[0033] Example 2. Dissolve metal cobalt in sulfuric acid, the cobalt content in the cobalt sulfate solution is 100g / l, and dissolve ammonium bicarbonate and ammonia in deionized water to prepare a complex precipitation agent, in which Co:NH 4 HCO 3 : NH 3 .H 2 O=1:1.0:1.0 (mole), take 200 liters of the above cobalt sulfate solution and add it to a reactor equipped with a stirrer and a thermometer. Under stirring conditions, add the prepared complex precipitation agent to the reactor at a temperature of 90°C for reaction When PH=7.4, the reaction is finished, the precipitated cobalt salt is filtered, washed with deionized water greater than 90℃ for 8 times, placed in a calciner for 18 hours at a temperature of 300°-1000℃, and the content of Co3cobalt tetroxide obtained by pulverization and classification is 73.3% , Loose density 1.0g / cm 3 , Tap density 2.5g / cm 3 , 4500 times the average particle diameter of 5μm under the electron microscope.

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Abstract

A process for preparing Co3O4 includes such steps as dissolving Co in nitric acid, hydrochloric acid or sulfuric acid to generate cobolt nitrate (or sulfate, or chloride), dissolving precipitant and complexing agent in deionized water to prepare saturated solution, adding the prepared to solution to reactor, regulating pH=4-5.5, adding complexing precipitant at 35-100 deg.c while stirring, reacting, filtering, washing with deionized water at temp higher than 90 deg.C, calcining at 300-1000 deg.C for 5-25 hr, pulverizing and classifying.

Description

Technical field [0001] The invention relates to a method for manufacturing cobalt tetroxide, which is used as a raw material for lithium cobalt oxide, a positive electrode material of a lithium ion battery, and can also be used for fuel cell materials, catalysts, magnetic materials, and electronic materials, and belongs to the field of inorganic material manufacturing. Background technique [0002] In recent years, with the rapid growth of the notebook computer, mobile phone, and small electronic product markets, the successful development of electric vehicles, and the rapid expansion of the lithium-ion battery market, the cathode material is mainly lithium cobalt oxide, and the key material for the production of lithium cobalt oxide is cobalt tetroxide. Due to the special requirements of the chemical composition and physical properties of lithium cobalt oxide materials, the chemical composition and physical properties of the raw material cobalt tetroxide have a great influence o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04
Inventor 戴振华
Owner 戴振华
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