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A kind of preparation method of superfine cobalt powder

A technology of ultra-fine cobalt powder and cobalt salt, which is applied in metal processing equipment, transportation and packaging, etc. It can solve the problems of large dead volume of inorganic ceramic membrane equipment, powder cannot be completely discharged, and product yield is reduced, so as to improve raw materials Utilization rate, low cost, effect of reducing water content

Active Publication Date: 2018-04-13
科立鑫(珠海)新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems, such as high operating pressure leading to high operating costs; inorganic ceramic membrane equipment has a large dead volume, which easily leads to the incomplete discharge of partially washed powder and reduces product yield; after wet precipitation The ultrafine powder needs to be transferred to the inside of the membrane equipment before it can be filtered and washed. During the transfer process, it is easy to cause the loss of ultrafine powder and the introduction of unavoidable impurities.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of superfine cobalt powder, the steps are as follows:

[0035] (1) Take potassium oxalate and cobalt chloride respectively, add water to obtain 0.2mol / L potassium oxalate solution and cobalt chloride solution;

[0036] (2) Add each 100L of the potassium oxalate solution and the cobalt chloride solution obtained in the step (1) to the reaction tank, stir at 25° C. for 30 minutes, adjust the pH of the solution to be 7, and generate cobalt oxalate precipitation;

[0037] (3) Put the hollow fiber membrane module below the liquid level of the reaction tank, adopt the way of suction, the suction pressure is 0.01-0.07MPa, the solution in the reaction tank is pumped out, and the sediment in the reaction tank is intercepted by the hollow fiber membrane module, Distributed on the outer surface of the hollow fiber membrane module or left at the bottom of the reaction tank, the extracted reaction tank solution is collected and used as the bottom liquid of the r...

Embodiment 2

[0043] A preparation method of superfine cobalt powder, the steps are as follows:

[0044] (1) Take ammonium oxalate and cobalt sulfate respectively, add water to obtain 2.5mol / L potassium oxalate solution and cobalt chloride solution;

[0045] (2) Add each 100L of the potassium oxalate solution and the cobalt chloride solution obtained in the step (1) to the reaction tank, stir at 60° C. for 15 minutes, adjust the pH of the solution to be 4.5, and generate cobalt oxalate precipitation;

[0046] (3) Put the hollow fiber membrane module below the liquid level of the reaction tank, adopt the way of suction, the suction pressure is 0.01-0.07MPa, the solution in the reaction tank is pumped out, and the sediment in the reaction tank is intercepted by the hollow fiber membrane module, Distributed on the outer surface of the hollow fiber membrane module or left at the bottom of the reaction tank, the extracted reaction tank solution is collected and used as the bottom liquid of the r...

Embodiment 3

[0052] A preparation method of superfine cobalt powder, the steps are as follows:

[0053] (1) Take potassium oxalate and cobalt nitrate respectively, add water to obtain 1mol / L potassium oxalate solution and cobalt chloride solution;

[0054] (2) Add each 100L of the potassium oxalate solution and the cobalt chloride solution obtained in the step (1) to the reaction tank, stir at 40° C. for 20 minutes, adjust the pH of the solution to be 6, and generate cobalt oxalate precipitation;

[0055] (3) Put the hollow fiber membrane module below the liquid level of the reaction tank, adopt the way of suction, the suction pressure is 0.01-0.07MPa, the solution in the reaction tank is pumped out, and the sediment in the reaction tank is intercepted by the hollow fiber membrane module, Distributed on the outer surface of the hollow fiber membrane module or left at the bottom of the reaction tank, the extracted reaction tank solution is collected and used as the bottom liquid of the reac...

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PUM

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Abstract

The invention relates to a preparation method of ultrafine cobalt powder, which comprises wet precipitation, hollow fiber membrane module sucking and separating sediment and reaction tank solution, adding water to wash and remove impurities, sun room predrying, drying and calcining. The preparation method of the ultrafine cobalt powder of the present invention uses the hollow fiber membrane module to separate the sediment and the solution by means of suction, and the separation effect is good and the cost is low; the extracted reaction tank solution can be recycled to improve the utilization rate of raw materials; It is simple and fast to restore the flux of the hollow fiber membrane with the help of compressed air; the sediment is pre-dried with the help of the glass sun room, which greatly reduces its water content, thereby reducing the power consumption during the drying process and saving energy.

Description

technical field [0001] The invention relates to a production method of functional materials, in particular to a preparation method of ultrafine cobalt powder. Background technique [0002] Cobalt is an important strategic metal. Ultrafine cobalt powder and its oxide powder are important raw materials for the production of battery electrodes, hard alloys, magnetic alloys, diamond tools, catalyst carriers, etc. and other fields have a wide range of applications. Ultrafine cobalt powder and its oxide powder are generally prepared by calcining cobalt salts containing carbonic acid radicals as important precursors. These precursors include cobalt oxalate and cobalt carbonate. [0003] Wherein, the traditional industrial production method of cobalt oxalate is to adopt (NH 4 ) 2 C 2 o 4 and CoCl 2 As a raw material, it is prepared by solution mixing and precipitation methods. The precipitation reaction of the traditional production method is completed in an acidic environmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/30B22F1/00
CPCB22F9/30B22F1/05
Inventor 曹蓓蓓
Owner 科立鑫(珠海)新能源有限公司