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Preparation method of metal aluminum

A technology of metal aluminum and aluminum nitride, which is applied in the field of metal aluminum preparation, can solve the problems of low purity and direct yield of metal aluminum, and achieve the effects of good crystallization, high heating efficiency and simple operation

Inactive Publication Date: 2018-03-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent, carbon is added to alumina in a vertical vacuum furnace, and then mixed uniformly to obtain a mixed material, which is pressed into a block and reduced under the conditions of nitrogen gas, pressure 10-50Pa, and temperature 1300-1700°C. Aluminum nitride: The obtained aluminum nitride is subjected to a thermal decomposition reaction under the conditions of a pressure of 5-60Pa and a temperature of 1850-2050K for 20-60min, then cooled to room temperature, and collected on a condenser to obtain metal aluminum with good crystallization. However, the purity and direct yield of metal aluminum prepared by this patent are relatively low

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  • Preparation method of metal aluminum

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Embodiment 1

[0026] Embodiment 1: the preparation method of metal aluminum, concrete operation is as follows:

[0027] The volume of 70g block is 2~3cm 3 The wurtzite-type analytically pure aluminum nitride raw material was placed in a crucible (volume 0.5L) in a vacuum induction furnace, the vacuum degree was controlled at 7.5Pa, and then the temperature was raised from 30°C to 800°C at a rate of 70°C / min. 45°C / min from 800°C to 1200°C, at a rate of 15°C / min from 1200°C to 1500°C, at a rate of 15°C / min from 1500°C to 1650°C, then cool down to 1600°C, at 1600°C Keep warm for 30 minutes under the same conditions, and then lower the temperature to 90°C after the heat preservation is over, collect the well-crystallized and easily separated metal aluminum on the condensing device.

[0028] The physical figure, SEM figure, and XRD collection of patterns of the metal aluminum prepared in this embodiment are as follows: figure 1 , 2 , 3, the purity of metal aluminum is >98wt.%, and the direct ...

Embodiment 2

[0029] Embodiment 2: the preparation method of metal aluminum, concrete operation is as follows:

[0030] The volume of 50g block is 1.5~2cm 3 The wurtzite-type analytically pure aluminum nitride raw material was placed in a crucible (volume 0.4 L) in a vacuum induction furnace, and the vacuum degree was controlled at 10 Pa, and then the temperature was raised from 30 °C to 700 °C at a rate of 60 °C / min, and at a rate of 50 °C. °C / min from 700 °C to 1150 °C, at a rate of 20 °C / min from 1150 °C to 1480 °C, at a rate of 10 °C / min from 1480 °C to 1670 °C, and then cooled to 1650 °C, at 1650 °C Keep warm for 10 minutes, and when the temperature drops to 100 ° C after the end of the heat preservation, the metal aluminum with good crystallization and easy separation is collected on the condensing device.

[0031] The purity of the metal aluminum prepared in this example is >95wt.%, and the direct recovery rate of metal aluminum is >96%.

Embodiment 3

[0032] Embodiment 3: the preparation method of metal aluminum, concrete operation is as follows:

[0033] The volume of 80g block is 3~5cm 3 The wurtzite-type analytically pure aluminum nitride raw material was placed in a crucible (volume 0.6 L) in a vacuum induction furnace, and the vacuum degree was controlled at 15 Pa, and then the temperature was raised from 30 °C to 750 °C at a rate of 80 °C / min, and at a rate of 47 °C. °C / min from 750 °C to 1180 °C, at a rate of 17 °C / min from 1180 °C to 1450 °C, at a rate of 15 °C / min from 1450 °C to 1670 °C, and then cooled to 1620 °C, at a temperature of 1620 °C Under the conditions of heat preservation for 20 minutes, when the temperature dropped to 90 °C after the heat preservation, the metal aluminum with good crystallization and easy separation was collected on the condensing device.

[0034] The purity of the metal aluminum prepared in this example is >97wt.%, and the direct recovery rate of metal aluminum is >98%.

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Abstract

The invention discloses a preparation method of metal aluminum, which particularly includes the steps of: 1) performing first heating, second heating, third heating and fourth heating to aluminum nitride under a vacuum condition with pressure being 7.5-30 Pa, wherein after the fourth heating, the aluminum nitride is heated to terminal temperature; and 2) performing first cooling to the material from the terminal temperature, maintaining the temperature, and performing second cooling to prepare the metal aluminum. With the aluminum nitride as raw material, the metal aluminum is produced throughvacuum thermal-decomposition reaction, wherein vacuum degree, heating temperature, preservation temperature and temperature maintenance time are controlled so as to increase direct yield of the metalaluminum. The metal aluminum is high in purity and direct yield, has excellent crystallization and is easy to separate. The preparation method has simple operations, is low in energy consumption andis free of environment pollution, and has excellent application prospect.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal smelting, in particular to a method for preparing metal aluminum. Background technique [0002] Aluminum is currently the second largest group of metals after iron, and already has a wide range of applications. According to statistics, the aluminum content in the earth's crust is about 8.8%. Unlike other commonly used metals, aluminum has not been discovered for a long time. This is because aluminum is a very active metal and has a tendency to react strongly with oxygen. A continuous and dense film is often formed on the surface of aluminum in the air, which plays a role in preventing aluminum from continuing to oxidize. There is no free aluminum, which is why aluminum has good corrosion resistance. [0003] Aluminum has outstanding advantages such as low density, thermal conductivity, electrical conductivity, and good corrosion resistance, and can form high-quality aluminum-based light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B21/00
CPCC22B21/0053
Inventor 陈秀敏王家驹李高锋周志强杨斌徐宝强郁青春刘大春马文会戴永年蒋文龙邓勇熊恒吴鉴龙萍杨佳
Owner KUNMING UNIV OF SCI & TECH