Composite magnetic micro-sphere and method for preparing same

A composite magnetic and microsphere technology, which is applied in the preparation of microspheres, microcapsule preparation, magnetic properties of inorganic materials, etc., can solve the problems of limiting the application of magnetic-assisted separation technology, harsh preparation method conditions, complicated process flow, etc., and achieves easy and rapid prototyping. , good sphericity and coverage, the effect of short process flow

Active Publication Date: 2016-07-13
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method has harsh conditions and the process is relatively complicated
The applicable conditions of the previously published and reported magnetic microspheres are generally mild, and it is difficult to apply them under high temp

Method used

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  • Composite magnetic micro-sphere and method for preparing same
  • Composite magnetic micro-sphere and method for preparing same
  • Composite magnetic micro-sphere and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0051] Example 1

[0052] 60g of Fe with a particle size of 0.1μm 3 O 4 The powder was dispersed in a mixture of 1600ml ethanol, 400ml deionized water and 45ml concentrated ammonia water, 1g sodium stearate was added, and 30g methyl orthosilicate solution was added, reacted at room temperature and stirred for 0.1h. Magnetic separation, washing solid particles with ethanol and water respectively.

[0053] Add a certain amount of deionized water to the obtained solid particles to adjust the solid concentration to 5 wt%, add dilute nitric acid to adjust the pH to 3, mechanically stir for 30 minutes, drop 12 g of 40 wt% silica sol, and continue stirring for 30 minutes. The stirring speed is 400 rpm.

[0054] The obtained magnetic fluid slurry is transported into a spray drying device, and the inlet temperature is controlled to 200°C and the outlet temperature is 100°C, and then dried and molded; then, it is calcined at 280°C in an air atmosphere for 6 hours to obtain coated micro-nano c...

Example Embodiment

[0057] Example 2

[0058] Weigh 60g particle size to 0.5μmFe 3 O 4 Powder, placed in 1000ml0.1molL -1 HNO 3 In, ultrasonic for 10min, magnetic separation, washing with ethanol and deionized water respectively.

[0059] Disperse the solid powder in 1600ml ethanol, 400ml deionized water and 25ml 10% sodium hydroxide solution, add 1g sodium dodecylsulfonate, add 40g ethyl orthosilicate solution, react at 40°C, and stir for 2h. Magnetic separation, washing solid particles with ethanol and water respectively.

[0060] Add a certain amount of deionized water to the obtained solid particles to adjust the solid concentration to 15% by weight, add dilute nitric acid to adjust the pH to 4, mechanically stir for 30 minutes, add 12 g of 40% by weight potassium silicate dropwise, and continue stirring for 30 minutes. The stirring speed is 750 rpm.

[0061] The obtained magnetic fluid slurry is transported into a spray drying device, and the inlet temperature is controlled at 250°C and the outlet ...

Example Embodiment

[0064] Example 3

[0065] Disperse 60g of iron powder with a particle size of 1μm in a mixture of 1000ml of ethanol, 250ml of deionized water and 45ml of concentrated ammonia, add 1g of sodium dodecylbenzene sulfonate, add 50g of ethyl orthosilicate solution, react at 50°C, and stir. 4h. Magnetic separation, washing solid particles with ethanol and water respectively.

[0066] Add a certain amount of deionized water to the obtained solid particles to adjust the solid concentration to 25% by weight, add dilute nitric acid to adjust the pH to 5, mechanically stir for 30 minutes, add 12 g of 40% by weight ethyl orthosilicate dropwise, and continue to stir for 30 minutes. The stirring speed is 1100 rpm.

[0067] The obtained magnetic fluid slurry is transported into a spray drying device, and the inlet temperature is controlled to 300°C and the outlet temperature is 150°C, and then dried and molded; then, it is calcined at 400°C in an air atmosphere for 6 hours to obtain coated micro-n...

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Abstract

The invention relates to a composite magnetic micro-sphere and a method for preparing the same, in particular to a composite magnetic micro-sphere with permanent magnetism and coated core-shell structures and a method for preparing the composite magnetic micro-sphere.The composite magnetic micro-sphere and the method have the advantages that the composite magnetic micro-sphere is easy to quickly form, industrial scale-up can be facilitated, and technological processes are short and are high in yield; the composite magnetic micro-sphere has large particles and is excellent in sphericity degree and coating rate and high in specific saturation magnetization; the composite magnetic micro-sphere is applicable to the fields of catalysis, chemical separation, modern coal, petroleum and natural gas chemical industry and the like.

Description

technical field [0001] The invention relates to a composite magnetic microsphere and a preparation method thereof, more specifically, to a composite magnetic microsphere with permanent magnetism and a coated core-shell structure, and to a preparation method thereof. Background technique [0002] The magnetic-assisted process mainly includes magnetic separation and magnetic-assisted reaction processes. Magnetic separation technology is a technology that uses magnetically responsive materials to combine with target substances and separates them under the condition of an external magnetic field. Magnetic separation technology has the advantages of high processing efficiency, small volume and simple structure of magnetic separation equipment. At present, it is mainly used in wastewater treatment, adsorption desulfurization, biochemical separation and other fields. A successful application case of magnetically assisted reaction process is the magnetically stabilized bed reactor...

Claims

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Application Information

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IPC IPC(8): B01J13/02H01F1/01B22F1/02
Inventor 刘庆华罗明生朱加清
Owner CHNA ENERGY INVESTMENT CORP LTD
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