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Process for preparing Co3O4

A technique for manufacturing cobalt trioxide and a manufacturing method, which is applied in the field of inorganic material manufacturing, and can solve problems such as difficult control of the synthesis process, complex process, and high cost, and achieve the effects of easy production control, simple process, and low cost

Inactive Publication Date: 2002-10-30
戴振华
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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

[0024] 3. Preparation of cobalt salts

[0025] Add the prepared cobalt solution into a reaction kettle with a thermometer and a stirrer, adjust the pH to 4.0-5.5, add a complex precipitation agent at 35°C-100°C under stirring conditions, and the pH value at the end of the reaction is between 7.0-8.0.

[0026] 4. Filter the cobalt salt slurry and wash with deionized water ≥ 90°C.

[0027] 5. Dry and pulverize the cobalt salt, or directly place the washed cobalt salt in a calciner with adjustable air atmosphere, and calcinate at 300-1000°C for 5-25 hours, and then pulverize and classify to obtain tricobalt tetroxide.

[0028] Cobalt tetroxide manufactured by the present invention has a Co content of 73.0-74.0%, and a bulk density of 0.7-1.4g / m 3 , tap density ≥ 2.0g / m 3 , The average particle diameter under 4500 times electron microscope is 1-10μm, spinel structure and other characteristics, based on the requirements of lithium cobalt oxide, the chemical composition and physic...

example 1

[0031] Example 1. metal cobalt is dissolved in nitric acid, the cobalt content 60g / l of cobalt nitrate solution, ammonium bicarbonate, EDTA are dissolved in deionized water and prepare complex precipitation agent, and its consumption is: Co: NH 4 HCO 3 : EDTA=1: 2.5: 0.3 (mole), get above-mentioned cobalt nitrate solution 200l and add in the reaction kettle of band stirrer and thermometer, under the condition of stirring, the complex precipitation agent of preparation is added in the reaction kettle when temperature is 45 ℃ reaction. When PH=7.2, the reaction is finished, the precipitated cobalt salt is filtered, washed 7 times with deionized water above 90°C, placed in a stock furnace at a temperature of 300°-1000°C, calcined for 14 hours, pulverized and classified to obtain the Co content of tricobalt tetroxide 73.6%, bulk density 1.0g / m 3 , tap density 2.6g / m 3 , 4500 times electron microscope average particle diameter 3μm.

example 2

[0032] Example 2. metal cobalt is dissolved in sulfuric acid, cobalt content 100g / l in cobalt sulfate solution, ammonium bicarbonate, ammoniacal liquor are dissolved in deionized water and prepare complex precipitation agent, wherein Co:NH 4 HCO 3 : NH 3 .H 2 O=1:1.0:1.0 (mole), take 200l of the above-mentioned cobalt sulfate solution and add it to a reactor with a stirrer and a thermometer. Under stirring conditions, add the prepared complexing precipitation agent into the reactor at a temperature of 90°C to react , when the pH=7.4, the reaction is finished, the precipitated cobalt salt is filtered, washed 8 times with deionized water greater than 90°C, placed in a calciner at a temperature of 300°-1000°C for 18 hours, crushed and classified to obtain a Co content of 73.3% , bulk density 1.0g / m 3 , tap density 2.5g / m 3 , 4500 times electron microscope average particle diameter 5μm.

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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 manufacturing method of tricobalt tetroxide, which is used as a raw material of lithium cobalt oxide, a positive electrode material of lithium ion batteries, 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 market for notebook computers, mobile phones, and small electronic products, and the successful development of electric vehicles, the lithium-ion battery market has expanded rapidly. The positive electrode material is mainly lithium cobalt oxide, and the key material for the production of lithium cobalt oxide is cobalt trioxide. Due to the special requirements for the chemical composition and physical properties of lithium cobalt oxide materials, the chemical composition and physical properties of the raw material cobalt trioxide have ...

Claims

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Application Information

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IPC IPC(8): C01G51/04
Inventor 戴振华
Owner 戴振华
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