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Method for synthesizing floriform cobalt magnetic powder by mixed solvent thermal method

A magnetic powder and solvent technology, which is applied in the field of solvothermal synthesis of flower-shaped cobalt magnetic powder, can solve the problems of numerous auxiliary raw materials, unfavorable industrial production, and complicated cobalt powder process.

Inactive Publication Date: 2012-02-29
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from this that the above-mentioned process of preparing cobalt powder is relatively complicated, and the auxiliary raw materials consumed are various, which are not conducive to industrial production.

Method used

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  • Method for synthesizing floriform cobalt magnetic powder by mixed solvent thermal method
  • Method for synthesizing floriform cobalt magnetic powder by mixed solvent thermal method
  • Method for synthesizing floriform cobalt magnetic powder by mixed solvent thermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Disperse 1.25g of cobalt acetate into 15ml of ethylene glycol solution, then disperse 4g of sodium hydroxide into 15ml of deionized water to obtain sodium hydroxide solution (6.66M), then pour the two solutions into polytetrafluoroethylene, they After complete mixing an additional 5 ml of hydrazine hydrate was added. The ratio of deionized water, ethylene glycol and hydrazine hydrate is 3:3:1, the filling volume is 4 / 5, the bushing is installed, and the temperature is kept at 180°C for 36 hours. Finally, naturally cool to room temperature, collect the mother liquor, wash the precipitate repeatedly, separate, collect and dry the cobalt magnetic powder with a permanent magnet.

[0017] XRD analysis results show that the product is cobalt with hexagonal packing (hcp) structure, such as figure 1 ; Scanning electron microscopy (SEM) analysis results show that the product is a monodisperse uniform flower-like morphology, such as figure 2 . image 3 It is a high-magnifica...

Embodiment 2

[0019] Disperse 1.25g of cobalt acetate into 15ml of ethylene glycol solution, then disperse 4g of sodium hydroxide into 15ml of deionized water to obtain sodium hydroxide solution (6.66M), then pour the two solutions into polytetrafluoroethylene, they After complete mixing an additional 5 ml of hydrazine hydrate was added. The ratio of deionized water, ethylene glycol and hydrazine hydrate is 3:3:1, the filling volume is 4 / 5, the bushing is installed, and the temperature is kept at 180°C for 4 hours. Finally, naturally cool to room temperature, collect the mother liquor, wash the precipitate repeatedly, separate, collect and dry the cobalt magnetic powder with a permanent magnet. The results of scanning electron microscope (SEM) analysis show that the product is monodisperse irregular particles with a diameter of 0.3-0.5 μm, such as Figure 4 .

Embodiment 3

[0021] Disperse 1.25g of cobalt acetate into 15ml of ethylene glycol solution, then disperse 4g of sodium hydroxide into 15ml of deionized water to obtain sodium hydroxide solution (6.66M), then pour the two solutions into polytetrafluoroethylene, they After complete mixing an additional 5 ml of hydrazine hydrate was added. The ratio of deionized water, ethylene glycol and hydrazine hydrate is 3:3:1, the filling volume is 4 / 5, the bushing is installed, and the temperature is kept at 180°C for 12 hours. Finally, naturally cool to room temperature, collect the mother liquor, wash the precipitate repeatedly, separate, collect and dry the cobalt magnetic powder with a permanent magnet.

[0022] The results of scanning electron microscopy (SEM) analysis showed that the product was monodisperse with a diameter of 0.6-0.9 μm and just started to form a flower-like morphology, such as Figure 5 .

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Abstract

The invention provides a method for preparing floriform cobalt magnetic powder by using deionized water, glycol and hydrazine hydrate as solvents and cobaltous acetate as a raw material. The method comprises the following simple steps of: dispersing 1.25 grams of cobaltous acetate in 15 milliliters of a glycol solution, preparing 6.66 M of a sodium hydroxide solution, pouring the two solutions into polytetrafluoroethylene, mixing fully, and adding 5 milliliters of hydrazine hydrate, wherein a ratio of the deionized water to the glycol to the hydrazine hydrate is 3:3:1, and the filling amount is 4 / 5; arranging a cylinder sleeve by using a bushing, keeping the temperature of 180 DEG C for 4, 12, 24 and 36 hours; and cooling to the room temperature naturally, collecting a mother solution, cleaning precipitates repeatedly, separating by using a permanent magnet, collecting and drying to obtain the cobalt magnetic powder. The method has the advantages of simplicity, high dispersity, and crystallinity and the like, and can be widely applied to related industry of magnetic liquid, coatings, medicinal orientation, rechargeable batteries, catalysts and the like; and raw materials are low in cost, the process is simple, and large-scale industrial production is easy to realize.

Description

technical field [0001] The invention relates to a method for solvothermally synthesizing flower-shaped cobalt magnetic powder under the mixed solvent system of deionized water, ethylene glycol and hydrazine hydrate. [0002] Background technique [0003] Cobalt is a silver-white metal with ferromagnetism and ductility, which can conduct electricity and heat. It is an important raw material for producing high-strength, high-temperature-resistant and corrosion-resistant alloys. Therefore, it has been widely used in the fields of high-density magnetic liquid, magnetic carrier, drug guide, rechargeable battery and catalyst. At present, there are many ways to prepare cobalt in industry, such as: gas phase reaction method, solid phase reaction method - high energy ball milling, pyrolysis, liquid phase reaction method a. coprecipitation method (industrial synthesis method) b. sol-gel method c. water Thermal method d. Solvothermal method. Among the above methods, the hydrotherma...

Claims

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Application Information

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IPC IPC(8): B22F9/24H01F1/04H01F1/06
Inventor 拜山·沙德克谢木西丁·阿布拉阿卜杜外力·阿卜杜克力木木提拉·阿曼
Owner XINJIANG UNIVERSITY
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