High-activity ultrafine aluminum powder preparing process and device
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A preparation process and technology of active aluminum, which is applied in the field of preparation process and device of ultra-fine high-activity aluminum powder, can solve problems such as irregular shape and influence on surface activity, achieve low environmental impact, high surface activity, and reduce production cost Effect
Inactive Publication Date: 2013-07-31
宁夏新和新材科技有限公司
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Mechanical grinding and water atomization methods can usually only produce powders with an average particle size between 40 and 100 μm and irregular shapes; although jet milling and air atomization methods can also prepare powders with finer particle sizes, due to the extreme aluminum powder Easy to absorb oxygen, the above preparation method will seriously affect its surface activity
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Embodiment 1
[0036] Such as figure 1 , 2 Shown, the preparation technology of superfine high-activity aluminum powder is as follows:
[0037] 1) Melting: The aluminum ingot is melted in the aluminum melting furnace, and the melted aluminum liquid is stored in the heat preservation area of the aluminum melting furnace, and the temperature of the aluminum liquid in the heat preservation area is kept at about 760°C;
[0038] 2) Atomization: The aluminum liquid in the heat preservation area of the aluminum melting furnace is transported to the atomization chamber through the aluminum liquid delivery pipe, and sprayed out through the gas atomization nozzle installed in the atomization chamber for atomization and granulation. The injection direction of aluminum liquid is horizontal injection.
[0039] The aluminum liquid in the heat preservation area is under the influence of the liquid surface pressure of the aluminum liquid and the mixed gas on the gas atomization nozzle. The pressure is...
Embodiment 2—5
[0048] On the basis of Example 1, change the aluminum liquid temperature in the heat preservation zone, the pressure of the mixed gas, the flow rate and the ratio of nitrogen and oxygen in the mixed gas, and the finished aluminum powder is shown in the following table:
[0049] Example Aluminum liquid temperature pressure flow rate nitrogen to oxygen ratio Aluminum powder particle size 2 780 8 4 99.9%：0.1% 6 3 800 9 5 99.9%：0.1% 4 4 820 10 5 99.99%：0.01% 3 5 840 12 6 99.999%：0.001% 1
[0050] In the above examples, the water surface coverage dispersion of the finished aluminum powder is >10000cm 2 / g, active aluminum is greater than 99%, and the particle size of aluminum powder is the average particle size.
[0051] In step 3 of Example 2, the classifier uses a pulse back-blowing bag filter.
[0052] In Step 3 of Example 3-5, the classifier adopts a two-stage classification in which a multi-tube ceramic dust collecto...
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Abstract
The invention relates to a high-activity ultrafine aluminum powder preparing process and a high-activity ultrafine aluminum powder preparing device. The high-activity ultrafine aluminum powder preparing process comprises melting, atomizing and classifying steps. The high-activity ultrafine aluminum powder preparing device relates to a special aluminum melting furnace and a gas atomizing nozzle, wherein the aluminum melting furnace comprises an aluminum melting furnace body with a circular furnace bottom, a burner nozzle installed in the aluminum melting furnace body, and a furnace door installed on the aluminum melting furnace body; a vertical furnace body is installed at the upper end of the aluminum melting furnace body; a feed port is formed in the upper end surface of the vertical furnace body; the high-activity ultrafine aluminum powder preparing device is characterized in that an aluminum liquid heat-preserving area is arranged on one side inside the aluminum melting furnace body with the circular furnace bottom; one end of an aluminum liquid suction pipe is communicated with the aluminum liquid heat-preserving area; the other end of the aluminum liquid suction pipe is connected with aluminum powder producing equipment; a flue gas recycling hood is installed at the upper end of the furnace door; an air preheater is communicated with the flue gas recycling hood and the vertical furnace body; and an air inlet of the burner nozzle is connected with the air preheater. The high-activity ultrafine aluminum powder preparing process and the high-activity ultrafine aluminum powder preparing device have the characteristics of simple process, low production cost, recyclability of a mixed gas, reasonable structures of the aluminum melting furnace and the gas atomizing nozzle, high production efficiency and the like.
Description
technical field [0001] The invention relates to a preparation process and device of aluminum powder, in particular to a preparation process and device of ultrafine high-activity aluminum powder. Background technique [0002] Highly active ultra-fine aluminum powder is widely used in high-end automobiles, home appliances and metallic paints for decorative materials, conductive pastes for electronic products, reducing agents for metallurgy, and rocket fuel propellants. And thin film solar cell coatings and other aspects have been important applications. [0003] The particle size and activity of aluminum powder are important parameters to determine the effect of reduction and impurity removal in the fine metallurgy process. The smaller the average particle size and the higher the surface activity, the more favorable the reduction reaction is, the better the impurity removal effect is, and finally high-purity active metals can be obtained. However, due to the strong affinity ...
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