Method for purifying aluminum and aluminum alloy melt through supergravity filtering and recombination

An aluminum alloy melt and composite purification technology, which is applied in the direction of improving process efficiency, can solve the problems of poor removal effect of small-sized inclusions, and achieves the effect of low cost and simple process flow.

Inactive Publication Date: 2016-08-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional aluminum melt purification methods include ordinary gravity sedimentation, ordinary filtration, slag washing and refining, bubble flotation...

Method used

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  • Method for purifying aluminum and aluminum alloy melt through supergravity filtering and recombination
  • Method for purifying aluminum and aluminum alloy melt through supergravity filtering and recombination
  • Method for purifying aluminum and aluminum alloy melt through supergravity filtering and recombination

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Put an appropriate amount of original aluminum alloy and protective slag into the filter crucible and put them into a supergravity heating furnace to raise the temperature to 700°C. After holding the heat for 10 minutes, turn on the centrifuge and adjust the speed to 600r / min and 1338r / min respectively. The corresponding gravity The coefficients are G=100 and G=500, respectively. Under the condition of constant temperature of 700°C, perform supergravity filtration treatment for 2 minutes, then close the centrifuge, take out the sample and spray water to cool it quickly. The obtained upper filter slag and the lower filter purified aluminum were inlaid, roughly ground and polished, and their microstructure was observed with a scanning electron microscope. The results are as follows: Figure 3-1 , 3-2 shown. Here the Ti element content in the aluminum alloy is much more than 0.5%, and the coarse Al 3 Ti has an adverse effect on the performance of the alloy, so Ti in the...

Embodiment 2

[0030] Put an appropriate amount of raw aluminum alloy and protective slag into the filter crucible and put them into a supergravity heating furnace to raise the temperature to 700°C. After holding the heat for 10 minutes, turn on the centrifuge and adjust the speed to 423r / min, respectively, and the corresponding gravity coefficient is G =50. Under the condition of constant temperature of 700°C, high-gravity filtration was carried out for 2 minutes and 10 minutes respectively, and then the centrifuge was turned off, and the sample was taken out and sprayed with water for rapid cooling. ICP-OES and oxygen, nitrogen and hydrogen analyzer were used to measure the impurity element Ti and oxygen content of the obtained purified aluminum, and calculate the removal rate of oxide inclusions and impurity element phases. The results are shown in Table 2.

[0031] Table 2. Removal rate of inclusions in purified aluminum obtained at different treatment times under gravity coefficient G=5...

Embodiment 3

[0034] Put an appropriate amount of original aluminum alloy and mold slag into the filter crucible and put them into the supergravity heating furnace to heat up to a specific temperature. After holding the heat for 10 minutes, turn on the centrifuge and adjust the speed to 423r / min, respectively, and the corresponding gravity coefficient is G =50. Under the constant temperature conditions of 700°C and 750°C, perform supergravity filtration treatment for 2 minutes, then close the centrifuge, take out the sample and spray water to cool it quickly. ICP-OES and oxygen, nitrogen and hydrogen analyzer were used to measure the impurity element Ti and oxygen content of the obtained purified aluminum, and calculate the removal rate of oxide inclusions and impurity element phases. The results are shown in Table 3.

[0035] Table 3. The removal rate of inclusions in purified aluminum obtained at different treatment temperatures under gravity coefficient G = 50

[0036]

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Abstract

The invention provides a method for removing inclusions in aluminum and aluminum alloy melt through supergravity filtering and recombination. The method belongs to a novel technology for purifying metal melt through a physical field. A supergravity field is produced by utilizing the rotation of a centrifuge, and supergravity filtering treatment is carried out on aluminum melt by adopting a filter. After supergravity filtering, oxide inclusions and impurity elements in the aluminum melt can be thoroughly separated from an aluminum matrix. By utilizing a supergravity filtering and recombination purifying method, non-metallic inclusions and impurity elements in the aluminum and aluminum alloy melt are rapidly removed, and the cleanliness of the aluminum melt is obviously improved. Compared with common filtering in actual production, the method can adopt the filter with a smaller hole diameter in the supergravity field, so that smaller inclusions can be removed without affecting the filtering rate of the melt.

Description

technical field [0001] The invention relates to the technical field of refining and purifying metal melts, in particular to a method for purifying metal melts under the composite action of a supergravity field and filtration. Background technique [0002] With the wide application of aluminum alloys in the fields of automobile manufacturing, aerospace, construction and electronic components, the performance requirements for aluminum alloys are increasing day by day. However, the existence of inclusions in aluminum alloys seriously affects the machinability and mechanical properties of aluminum alloys. Therefore, it is particularly important to further reduce the level of inclusion particles. Traditional aluminum melt purification methods include ordinary gravity sedimentation, ordinary filtration, slag washing and refining, air bubble flotation, etc. These traditional purification methods can effectively remove large-sized inclusion particles, but are not effective in remov...

Claims

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Application Information

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IPC IPC(8): C22B9/02C22B21/06
CPCC22B9/006C22B9/02C22B21/066Y02P10/20
Inventor 宋波宋高阳杨玉厚宋明明蔡泽云
Owner UNIV OF SCI & TECH BEIJING
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