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Microwave and ultrasound combined assisted ball-milling device and process for preparing high-performance nanopowder

A nano-powder, microwave ultrasonic technology, applied in the field of grinding and pulverization, can solve the problems of long ball milling action time, uneven particle size, poor repeatability, etc.

Active Publication Date: 2014-05-14
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main disadvantages of the ball milling method in the preparation of nano-powders are long milling time, high product strength, uneven particle size, and poor repeatability, which have become bottlenecks that limit the wide application of ball milling in the preparation of nano-powders in industry.

Method used

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  • Microwave and ultrasound combined assisted ball-milling device and process for preparing high-performance nanopowder
  • Microwave and ultrasound combined assisted ball-milling device and process for preparing high-performance nanopowder
  • Microwave and ultrasound combined assisted ball-milling device and process for preparing high-performance nanopowder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Microwave ultrasonic combined with assisted ball milling to prepare high-performance nano-nickel-zinc composite ferrite

[0041] The reactants are analytically pure nickel oxide, zinc oxide and iron powder, which are first prepared according to a certain chemical ratio, mixed evenly, and then the reactants are put into a Ф135×215mm ball mill tank with a ball-to-material ratio of 100:1 , then add deionized water to 2 / 3 of the jar. Turn on the motor 1 and the ultrasonic generator, the power of the ultrasonic generator is 200W, the frequency is 20KHz, start to stir the ball mill, the stirring speed is 235 revolutions per minute, carry out the aqueous solution ball milling of the reactant for 15 minutes, and then turn on the microwave generator to work together, The power of the microwave generator is 1KW, the frequency is 2450MHz, irradiate for 15 minutes, and then ultrasonic ball milling for 15 minutes, and so on and so forth; after a certain period of time, ta...

Embodiment 2

[0046] Example 2: Microwave Ultrasound Combined with Assisted Ball Milling to Prepare Nano Zinc Oxide

[0047] Using basic zinc carbonate as raw material and ethylene glycol as an organic solvent as a ball milling medium, we also prepared zinc oxide nano-oxides by the same method as in Example 1.

[0048] from up Figure 7 It can be seen that after 10 hours of microwave ultrasonic combined with assisted ball milling, all basic zinc carbonate was converted to zinc oxide. This proves that microwave ultrasonic combined with assisted ball milling is an effective means to effectively decompose basic zinc carbonate into zinc oxide. Moreover, in this process, the product is not subjected to heat treatment such as calcination, and in the whole process, all reactions are carried out in an organic solvent, and the reaction temperature does not exceed 100 ° C, which proves that this equipment is a kind of equipment that can be used to quickly realize salt It is a new equipment for the ...

Embodiment 3

[0051] Example 3: Microwave Ultrasound Combined with Assisted Ball Milling to Prepare Nanoscale Tin Oxide Powder

[0052] We used 100-mesh tin powder as the raw material and organic solvents such as acetic acid as the ball milling medium to prepare tin oxide nanopowder with a particle size of 10-20nm within 10 hours by the same method as in Example 1. This method has the characteristics of high efficiency, and is an ideal device and process method for industrial production of nano tin oxide powder.

[0053] We also carried out microwave-assisted ball milling and ultrasonic-assisted ball-milling experiments with the same raw materials, and found that no matter whether ultrasonic-assisted ball milling or microwave-assisted ball milling, nano-tin oxide powder could not be prepared for a long time.

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Abstract

The invention discloses a microwave and ultrasound combined assisted ball-milling device and process for preparing high-performance nanopowder. According to the device, a ball mill is placed in a microwave generator, and a bottomless ball-milling tank in the ball mill is connected with the top of an ultrasonic generator, so that the microwave and ultrasound combined assisted ball-milling device is formed. The process is characterized in that a medium solution and raw material powder in the ball-milling tank are subjected to cavatition of ultrasonic waves, the radiation effect of microwaves and the action of mechanical force of ball milling simultaneously, so that the speeds of reduction, oxidization, synthesis, decomposition and other reactions are greatly increased, and chemical reactions which cannot be realized by means of independent microwave-assisted ball milling or independent ultrasound-assisted ball milling in the prior art can happen. The device can be used for preparing multiple kinds of nanometer functional powder such as metallic oxide, ferrite, composite ferrite, wave-absorbing materials, luminescent materials and magnetic materials.

Description

technical field [0001] The invention belongs to the field of grinding and crushing, in particular to a microwave-ultrasonic combined-assisted ball milling device and process for preparing high-performance nano powder. Background technique [0002] Nano-ferrite has good microwave absorption energy and ideal magnetic properties, and is widely used in microwave-absorbing coatings, microwave-absorbing partition walls, high-frequency magnetic recording, magnetic resonance devices, and sensors. At present, the main preparation methods for preparing magnetic powder such as nano-ferrite and other nano-powders include sol-gel method, hydrothermal method, microwave hydrothermal method, co-precipitation method, citrate precursor method, high-energy ball milling method, etc. But these methods either cause serious environmental pollution, or consume a lot of energy, or have disadvantages such as long production time. [0003] Microwave is an efficient and environmentally friendly ne...

Claims

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Application Information

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IPC IPC(8): B02C17/10B02C17/18B02C23/00
Inventor 陈鼎
Owner HUNAN UNIV
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