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Method for preparing cobalt oxalate by pulse electromagnetic field

A pulsed electromagnetic field, cobalt oxalate technology, applied in the preparation of carboxylate, organic chemistry and other directions, can solve the problems of irregular morphology, low yield, high cost, reduce material flow and wastewater treatment volume, reduce production costs, The effect of increasing productivity

Inactive Publication Date: 2009-12-30
LIAONING UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the current production of cobalt powder has problems such as complex production process, high cost, large particle size of cobalt powder, and irregular shape, which cannot meet the market demand for cobalt powder
In addition, a homogeneous precipitation method with a very dilute solution or a slow-release precipitant can also be used to obtain a powder with an ideal particle size and shape, but because the yield is too low, it is often not of practical value

Method used

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  • Method for preparing cobalt oxalate by pulse electromagnetic field
  • Method for preparing cobalt oxalate by pulse electromagnetic field
  • Method for preparing cobalt oxalate by pulse electromagnetic field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Use a dropping funnel to acidify (pH=5) (NH 4 ) 2 C 2 O 4 Add CoCl to the solution 2 In solution, (NH 4 ) 2 C 2 O 4 With CoCl 2 The molar ratio is 1.5:1, and the dropping rate is controlled at 150ml / min. The reaction is carried out in a super constant temperature water bath at 35℃. During the reaction, mechanical stirring is applied and pulse electromagnetic field treatment is applied to the reaction system at the same time. The specific operation is to cover the coil outside the reaction vessel and connect both ends of the coil to the output terminal of the pulse electromagnetic field generator. , The pulse voltage is 600-800v, ​​the pulse frequency is 1-10Hz, and the pulse current is passed into the coil. After the reaction is completed, the precipitate is filtered, washed with deionized water, and dried under vacuum at room temperature for 26 hours to obtain a sample of cobalt oxalate. Weigh 6g of cobalt oxalate sample and place it in a tubular resistance furnace, heat i...

Embodiment 2

[0029] Use a dropping funnel to acidify (pH=4) (NH 4 ) 2 C 2 O 4 Add CoCl to the solution 2 In solution, (NH 4 ) 2 C 2 O 4 With CoCl 2 The molar ratio of is 1:1, and the dropping rate is controlled at 100ml / min. The reaction is carried out in a super constant temperature water bath at 20°C. During the reaction, mechanical stirring is applied and pulse electromagnetic field treatment is applied to the reaction system at the same time. The specific operation is to cover the coil outside the reaction vessel and connect both ends of the coil to the output terminal of the pulse electromagnetic field generator. , The pulse voltage is 1v, the pulse frequency is 1Hz, and the pulse current is passed into the coil. After the reaction is completed, the precipitate is filtered, washed with deionized water, and dried under vacuum at room temperature for 30 hours to obtain a sample of cobalt oxalate. Weigh 6g of cobalt oxalate sample and place it in a tubular resistance furnace, heat it to 430℃...

Embodiment 3

[0031] Use a dropping funnel to acidify (pH=6) (NH 4 ) 2 C 2 O 4 Add CoCl to the solution 2 In solution, (NH 4 ) 2 C 2 O 4 With CoCl 2 The molar ratio is 2:1, and the dropping rate is controlled at 200ml / min. The reaction is carried out in a super constant temperature water bath at 40℃. During the reaction, mechanical stirring is applied and pulse electromagnetic field treatment is applied to the reaction system at the same time. The specific operation is to put the coil outside the reaction vessel and connect the two ends of the coil to the output terminal of the pulse electromagnetic field generator. , The pulse voltage is 1000v, the pulse frequency is 100Hz, and the pulse current is passed into the coil. Pulse voltage: 1000v; pulse frequency: 100Hz. After the reaction is completed, the precipitate is filtered, washed with deionized water, and dried under vacuum at room temperature for 24 hours to obtain a sample of cobalt oxalate. Weigh 6g of cobalt oxalate sample and place it ...

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Abstract

The invention relates to a method for preparing cobalt oxalate by a pulse electromagnetic field, which solves the problems in the prior cobalt powder manufacture of complex process, high cost and large particle size and irregular shape of cobalt powder. The method comprises the following steps: acidulating (NH4)2C2O4 solution and controlling the pH value of the (NH4)2C2O4 solution at 4-6; dripping the acidulated (NH4)2C2O4 solution into CoCl2 solution, wherein the mol ration of (NH4)2C2O4 solution to CoCl2 solution is 1:1-2:1, and the dripping speed is controlled to be 100-200 ml / min; reacting in thermostatic water-circulator bath at 20-45 DEG C; mechanically stirring during reaction; processing the reaction system by a pulse electromagnetic field, wherein the pulse voltage is 1-1000V, and the pulse frequency is 1-100Hz; carrying out filtration, washing, vacuum drying at normal temperature after the reaction is completed to obtain a cobalt oxalate sample; and putting the cobalt oxalate sample into a tube-type resistance furnace to perform thermolysis reaction, cooling to room temperature in the furnace to obtain cobalt powder as a thermolysis product of cobalt oxalate. The invention has the advantages of simple process, low production cost, good quality, no pollution to treated objects or surrounding environment and wide application range, and can obtain products with different shapes and particle sizes.

Description

Technical field [0001] The invention relates to a method for preparing cobalt oxalate pulse electromagnetic field. Background technique [0002] Cobalt oxalate is an important raw material for the production of metal cobalt powder, which is widely used in cemented carbide, high-performance alloys, batteries, catalysts, permanent magnets and ceramic industries. Different application fields have different requirements for the morphology and particle size of cobalt powder. This raises a new topic for the development of cobalt powder preparation technology, namely the control of particle morphology and particle size in its preparation and processing. Obviously, regardless of the application field, the morphology and particle size of the powder are the main factors affecting the performance of the final product. The morphology, particle size and distribution of the powder as the most basic morphological characteristics of the powder material determine the overall and surface character...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/18B22F9/30C07C55/07C07C51/41
Inventor 王建中杜慧玲周大奇齐锦刚何力佳曹丽云
Owner LIAONING UNIVERSITY OF TECHNOLOGY
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