Cleaner production method for preparing superfine powder through self-propagating metallurgy method

An ultra-fine powder, clean production technology, applied in the field of metallurgy, can solve the problems of high cost, complex process, high energy consumption, etc., and achieve the effect of high powder activity, high reaction efficiency, and low energy consumption

Active Publication Date: 2013-12-25
NORTHEASTERN UNIV
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Problems solved by technology

[0003] The preparation technology of ultrafine powder can be divided into gas phase method, liquid phase method and solid phase method from a large range. At present, the pulverization method is the most used in industry. The preparation of ultrafine powder by the above method usually has high energy consumption and high cost. , complex process and other disadvantages

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  • Cleaner production method for preparing superfine powder through self-propagating metallurgy method

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Effect test

Embodiment 1

[0040] Mix the powdery boron oxide and magnesium powder and ball mill to a particle size of ≤0.5 μm, then press it into a billet under a pressure of 40 MPa, put it into a self-propagating reaction furnace to initiate a self-propagating reaction; the mixing ratio is boron oxide:magnesium powder by mass =100:110,

[0041] After the self-propagating reaction is finished, the reaction product is naturally cooled to normal temperature to obtain a crude product, and the boron in the crude product is dispersed in the spongy magnesium oxide matrix;

[0042] After the crude product is crushed, the magnesia in it is separated by leaching with hydrochloric acid; the concentration of hydrochloric acid used in leaching is 1mol / L; the liquid-solid ratio of hydrochloric acid to the crude product is 20:1ml / g, and the leaching is carried out at room temperature. The leaching temperature is 90°C and the leaching time is 10h; after leaching, the solid phase and leachate are obtained by filtratio...

Embodiment 2

[0046] Preparation method is with embodiment 1, and difference is:

[0047] (1) Press into a billet under a pressure of 60MPa; the mixing ratio is boron oxide:magnesium powder=100:120 by mass ratio;

[0048](2) The concentration of hydrochloric acid used in the leaching is 3mol / L; the liquid-solid ratio of hydrochloric acid to the crude product is 10:1ml / g; the leaching method is leaching at room temperature, the leaching temperature is 25°C, and the leaching time is 40h; the solid phase is obtained after leaching and leachate; the mass concentration of magnesium chloride in the leachate is 180g / L;

[0049] (3) Spray pyrolysis is to atomize and spray the leaching liquid through the atomizing nozzle into the high-temperature pyrolysis furnace under the pressure of 0.32MPa. The pyrolysis temperature in the high-temperature pyrolysis furnace is 400°C and the pyrolysis time is 10min. ; The particle size of nano-sized magnesium oxide is 80~100nm; the concentration of hydrochloric ...

Embodiment 3

[0051] Preparation method is with embodiment 1, and difference is:

[0052] (1) Press into a billet under a pressure of 70MPa; the mixing ratio is boron oxide:magnesium powder=100:128 by mass ratio;

[0053] (2) The concentration of hydrochloric acid used in the leaching is 5mol / L; the liquid-solid ratio of hydrochloric acid to the crude product is 4:1ml / g; the leaching method is leaching at room temperature, the leaching temperature is 50°C, and the leaching time is 20h; the solid phase is obtained after leaching and leachate; the mass concentration of magnesium chloride in the leachate is 300g / L;

[0054] (3) Spray pyrolysis is to atomize and spray the leaching liquid into the high-temperature pyrolysis furnace through the atomization nozzle under the pressure of 0.6MPa. The pyrolysis temperature in the high-temperature pyrolysis furnace is 200°C and the pyrolysis time is 60min. ; The particle size of nano-sized magnesium oxide is 330~390nm; the concentration of hydrochlori...

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Abstract

A cleaner production method for preparing superfine powder through a self-propagating metallurgy method is carried out according to the following steps: (1) mixing and conducting ball-milling on the powdery oxide and magnesium powder, then compacting into a blank, putting the blank into a self-propagating reaction furnace to cause a self-propagating reaction, and naturally cooling to the room temperature to obtain a coarse product; (2) using hydrochloric acid to leach and separate magnesium oxide in the coarse product after breaking, and filtering to obtain a solid phase and a leaching agent; (3) washing and drying the solid phase and making the solid phase into ultrafine powder; (4) processing the leaching agent through a spray-pyrolysis mode to obtain a nanoscale magnesium oxide and pyrolysis tail gas, wherein the hydrogen chloride in the pyrolysis tail gas is absorbed to form hydrochloric acid and is circularly used back in the leaching process. The cleaner production method producing the ultrafine powder through the self-propagating metallurgy mode has the characteristics of low material cost, low energy consumption, simple operation, low requirement on process conditions and the like, and the product is high in purity, small in particle size and high in powder activity.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a clean production method for preparing superfine powder by self-propagating metallurgy. Background technique [0002] Ultrafine powder preparation technology is accompanied by modern high-tech and new material industries, such as microelectronics and information technology, high-tech ceramics and refractory materials, polymer-based composite materials, biochemical industry, aerospace, new energy, etc., as well as traditional industrial technologies A new engineering technology developed by progress and comprehensive utilization of resources and deep processing is an emerging comprehensive technical science, which is of great significance to the development of modern high-tech industries. [0003] The preparation technology of ultrafine powder can be divided into gas phase method, liquid phase method and solid phase method from a large range. At present, the pulverization meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/02B22F9/20C01F5/10B82Y30/00
Inventor 张廷安豆志河吕国志刘燕赵秋月张子木蒋孝丽
Owner NORTHEASTERN UNIV
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