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Method for dissolving cobaltosic oxide and method for measuring non-cobalt metal element content

A technology of cobalt tetroxide and oxidizing property is applied in the field of dissolution of cobalt tetroxide and the determination of the content of non-cobalt metal elements in it, which can solve the problems of long dissolution time, harsh conditions, low test efficiency, etc. effect of residue

Inactive Publication Date: 2010-10-06
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the existing method for dissolving cobalt tetroxide, which is harsh and takes a long time before testing the content of non-cobalt metal elements in cobalt tetroxide by ICP-AES, so that the test efficiency is low, and to provide a simple and fast dissolving cobalt tetroxide method, and a highly efficient method for determining the content of non-cobalt metal elements in cobalt tetroxide by atomic emission spectrometry

Method used

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  • Method for dissolving cobaltosic oxide and method for measuring non-cobalt metal element content
  • Method for dissolving cobaltosic oxide and method for measuring non-cobalt metal element content
  • Method for dissolving cobaltosic oxide and method for measuring non-cobalt metal element content

Examples

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Embodiment 1

[0021] This example illustrates the method for dissolving cobalt tetroxide of the present invention and the method for determining the content of non-cobalt metal elements therein.

[0022] With 1000 milligrams of cobalt trioxide samples (number is ICP-01, buy from Zhuhai Ke Lixin Metal Material Co., Ltd., the model of product is Co 3 o 4 -L-12.6) placed in a ceramic container, at 150 ℃, first keep the tricobalt tetroxide sample in the container for 2 minutes, then place the tricobalt tetroxide sample in the electric furnace, and in the air atmosphere (the volume content of oxygen is 21%), The temperature was raised to 1000°C at a rate of 20°C / min and kept for 5 minutes, then the sample was taken out and cooled to room temperature naturally. Then the above-mentioned cobalt tetroxide sample was mixed with 15 milliliters of hydrochloric acid (concentration is 12 mol / liter), and stirred, after 30 minutes, the sample was completely dissolved, then fixed solution with a 100 millil...

Embodiment 2

[0025] This example illustrates the method for dissolving cobalt tetroxide of the present invention and the method for determining the content of non-cobalt metal elements therein.

[0026] With 1000 milligrams of cobalt trioxide samples (numbering is ICP-02, buy from Zhuhai Ke Lixin Metal Material Co., Ltd., the model of product is Co 3 o 4 -L-12.11) placed in a ceramic container, at 100 ℃, first keep the tricobalt tetroxide sample in the container for 3 minutes, then place the tricobalt tetroxide sample in the electric furnace, and in the air atmosphere (the volume content of oxygen is 21%), The temperature was raised to 600°C at a rate of 40°C / min and kept for 15 minutes, and then the sample was taken out and cooled to room temperature naturally. Then the above-mentioned cobalt tetroxide sample was mixed with 15 milliliters of sulfuric acid (concentration is 12 mol / liter), and stirred, after 30 minutes, the sample was all dissolved, then fixed solution with 100 milliliter ...

Embodiment 3

[0028] This example illustrates the method for dissolving cobalt tetroxide of the present invention and the method for determining the content of non-cobalt metal elements therein.

[0029] With 1000 milligrams of cobalt trioxide samples (the number is ICP-03, buy from Zhuhai Ke Lixin Metal Material Co., Ltd., the model of product is Co 3 o 4 -L-12.18) is placed in a ceramic container, and the tricobalt tetroxide sample is kept in the container for 2 minutes at 120°C, and then the tricobalt tetroxide sample is placed in a program-controlled box-type electric furnace in an air atmosphere (the volume content of oxygen is 21%) , the temperature was raised to 800°C at a rate of 60°C / min and kept for 10 minutes, and then the sample was taken out and cooled to room temperature naturally. Then the above-mentioned tricobalt tetroxide sample was mixed with a mixed solution of 12 milliliters of hydrochloric acid (concentration of 12 mol / liter) and 4 milliliters of nitric acid (concentrat...

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Abstract

The invention relates to a method for dissolving cobaltic-cobaltous oxide, which comprises leading cobaltic-cobaltous oxide to contact with dissolvent, and keeping the cobaltic-cobaltous oxide for 1-20 minutes under 100-1100 DEG C before the cobaltic-cobaltous oxide contacts with the dissolvent. The method can rapidly and fully dissolve cobaltic-cobaltous oxide which is difficult to dissolve, andsimultaneously eliminates cobaltic-cobaltous oxide remainder in dissolved solution, and the method is beneficial for rapidly and accurately doing atomic emission spectrometry to cobaltic-cobaltous oxide, which has high testing efficiency and accuracy.

Description

technical field [0001] The present invention relates to a method for dissolving tricobalt tetroxide and a method for determining the content of non-cobalt metal elements in it. More specifically, the present invention relates to a method for dissolving tricobalt tetroxide and the determination of the content of non-cobalt metal elements in tricobalt tetroxide by atomic emission spectroscopy. method of determination. Background technique [0002] Cobalt tetroxide is a kind of active material LiCoO for preparing lithium-ion battery positive electrode 2 common raw materials. Synthesis of LiCoO by traditional high-temperature solid-state method 2 Lithium carbonate (Li 2 CO 3 ) and cobalt tetroxide (Co 3 o 4 ) as raw material, prepared according to the ratio of Li:Co molar ratio of 1:1, and then baked at 700-900°C in an air atmosphere. For example, the LiCoO 2 The preparation method of is described in Huang D, et al. Solid solution: New cathodes for next generation lithiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/38G01N21/62
Inventor 盛允胡刚庾天丰
Owner BYD CO LTD