Deironing method for regenerated Al-Si-system aluminum alloy

A technology of aluminum alloy and iron remover, applied in the field of aluminum alloy iron removal, can solve the problems of unsuitable for industrial production, single iron removal method, difficult to control reaction, etc., and achieve the effects of less harmful gas, easy control and low cost

Active Publication Date: 2018-03-13
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to design a method for removing iron from recycled Al-Si series aluminum alloys, which overcomes the single problem of the current method for removing iron, and performs targeted removal of impurities on the differences in elements contained in different grades of waste aluminum. , and overcome the problems that the iron removal process is not easy to control the reaction and is not suitable for industrial production, etc.

Method used

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  • Deironing method for regenerated Al-Si-system aluminum alloy
  • Deironing method for regenerated Al-Si-system aluminum alloy
  • Deironing method for regenerated Al-Si-system aluminum alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Such as Figure 6 Shown, a kind of regeneration Al-Si series aluminum alloy iron removal method comprises the steps:

[0036] Step 100, weighing the refining agent, die casting into blocks and baking

[0037] Weigh an aluminum block with a mass of 2Kg, weigh 6g of refining agent, die-cast the refining agent into a refining agent block, put the refining agent block in an oven, raise the temperature of the oven to 200°C and keep it warm for 1 hour; KNO 3 、Na 2 AlF 6 、Na 2SiF 6 , NaCl and graphite powder in a mass-number ratio of 4.25:3:2.63:1.25:1.37.

[0038] Step 200, weighing the modifier and baking

[0039] Weigh 10g of the aluminum-strontium master alloy modifier, put the aluminum-strontium master alloy modifier into an oven, raise the temperature of the oven to 300°C and keep it warm for 35 minutes; the aluminum-strontium master alloy modifier in the modifier The content is 9%.

[0040] Step 300, weighing an iron remover and baking

[0041] Weigh 40g of th...

Embodiment 2

[0055] A method for removing iron from a recycled Al-Si series aluminum alloy, comprising the steps of:

[0056] Step 1, weigh an aluminum block with a mass of 2Kg, weigh 4g of refining agent, die-cast the refining agent into a refining agent block, put the refining agent block in an oven, raise the temperature of the oven to 200°C and keep it warm for 1 hour; refining KNO 3 、Na 2 AlF 6 、Na 2 SiF 6 , NaCl and graphite powder in a mass-number ratio of 4.1:3.4:2.5:1:1.5.

[0057] Step 2, take 7g of aluminum-strontium master alloy modifier, put the aluminum-strontium master alloy modifier in an oven, raise the temperature of the oven to 250°C and keep it warm for 30 minutes; the aluminum-strontium master alloy in the modifier is modified The content of strontium in the agent is 10%.

[0058] Step 3, weigh 20g of the primary iron remover, put the primary iron remover into the oven, raise the temperature of the oven to 250°C and keep it warm for 50 minutes; It is 1:1.96. Th...

Embodiment 3

[0067] A method for removing iron from a recycled Al-Si series aluminum alloy, comprising the steps of:

[0068] Step 1, weigh an aluminum block with a mass of 2Kg, weigh 4g of refining agent, die-cast the refining agent into a refining agent block, put the refining agent block in an oven, raise the temperature of the oven to 200°C and keep it warm for 1 hour; refining KNO 3 、Na 2 AlF 6 、Na 2 SiF 6 , NaCl and graphite powder in a mass-number ratio of 4.4:3:3:1:1.12.

[0069] Step 2, take 7g of aluminum-strontium master alloy modifier, put the aluminum-strontium master alloy modifier in an oven, raise the temperature of the oven to 250°C and keep it warm for 30 minutes; the aluminum-strontium master alloy in the modifier is modified The content of strontium in the agent is 8%.

[0070] Step 3, weigh 50g of the primary iron remover, put the primary iron remover into the oven, raise the temperature of the oven to 300°C and keep it warm for 60 minutes; the aluminum-manganese...

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Abstract

The invention discloses a deironing method for a regenerated Al-Si-system aluminum alloy. According to the deironing method, during a deironing process, strontium is added in to perform modification treatment, so that a needle-shaped beta-iron phase is broken and decomposed; primary silicon is refined, so that structural distribution is more uniform; manganese is reacted with boron and iron to generate a Fe2B to exert positive correlation effect; meanwhile, the beta-iron is inverted into an alpha-iron phase by the manganese, so that a settlement effect is realized; a high-melting-point and high-density Fe2B compound is generated through reaction of boron and admixture iron, and the Fe2B compound has high density difference from a melt; the iron-rich phases are deposited to the bottom of acrucible under the effect of gravity, so that the admixture iron element in the aluminum alloy is removed. The deironing method has the characteristics that operation is simple; cost is low; control is easy; and the iron content in the waste aluminum is obviously lowered.

Description

technical field [0001] The invention belongs to the technical field of iron removal of aluminum alloys, in particular to a method for iron removal of recycled Al-Si series aluminum alloys. Background technique [0002] As the use of aluminum products continues to increase, in order to reduce resource consumption, the treatment and secondary reuse of waste aluminum has been put on the agenda. There are many impurity elements in scrap aluminum, among which the requirement for the content of Fe element is extremely strict, and the remelted material is remelted many times, so that the Fe content continues to increase. In most cases, the presence of Fe is very harmful to the performance of aluminum alloys. The solid solubility of Fe in aluminum alloys is very low. When the Fe content exceeds 0.4%, it is easy to form coarse needles with other elements in aluminum alloys. Flake Fe phase, composition close to FeSiAl 5 (ie β-Fe phase) compound. It severely splits the matrix, causi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C1/03C22C21/04
CPCC22C1/026C22C1/03C22C1/06C22C21/04
Inventor 张林庞士鹏周成双
Owner ZHEJIANG UNIV OF TECH
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