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Iron removal method for recycled al-cu-si aluminum alloy

An al-cu-si and aluminum alloy technology, applied in the field of iron removal from aluminum alloys, can solve problems such as difficult reaction control, unsuitability for industrial production, and single iron removal method, and achieve low cost, less harmful gas, and practical methods Effect

Active Publication Date: 2019-04-26
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to design a method for removing iron from recycled Al-Cu-Si series aluminum alloys, which overcomes the problem of a single method for removing iron at present, and conducts a targeted analysis of the differences in elements contained in different grades of waste aluminum. Impurity removal, and overcoming 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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  • Iron removal method for recycled al-cu-si aluminum alloy
  • Iron removal method for recycled al-cu-si aluminum alloy
  • Iron removal method for recycled al-cu-si aluminum alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Such as Figure 6Shown, a kind of regeneration Al-Cu-Si series aluminum alloy iron removal method comprises the steps:

[0037] Step 100, weighing the refining agent, die casting into blocks and baking

[0038] Weigh an aluminum block with a mass of 2Kg, weigh 5g of refining agent, die-cast the refining agent into a refining agent block, put the refining agent block into an oven, raise the temperature of the oven to 260°C and keep it warm for 55 minutes; KNO 3 、C 2 Cl 6 、Na 2 SiF 6 , KCl and graphite powder in a mass-number ratio of 8:1.2:6:5.8:2.3.

[0039] Step 200, weighing the modifier and baking

[0040] Weigh 6g and 3g of aluminum-strontium master alloy modifier respectively, put the aluminum-strontium master alloy modifier into an oven, raise the temperature of the oven to 200°C and keep it warm for 45 minutes; the aluminum-strontium master alloy in the modifier is modified The content of strontium in the agent is 8%.

[0041] Step 300, weighing and baki...

Embodiment 2

[0054] A method for removing iron from a recycled Al-Si series aluminum alloy, comprising the steps of:

[0055] 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 240°C and keep it warm for 60 minutes; refining KNO 3 、C 2 Cl 6 、Na 2 SiF 6 , KCl and graphite powder in a mass ratio of 7.5:1:6.5:5:2.65.

[0056] Step 2, weigh 5g and 3.6g of the aluminum-strontium master alloy modifier respectively, put the aluminum-strontium master alloy modifier into the oven, raise the temperature of the oven to 240°C and keep it warm for 50 minutes; the aluminum-strontium master alloy modifier in the modifier is The content of strontium in the strontium master alloy modifier is 10%.

[0057] Step 3, weigh 48g of the iron remover, put the iron remover in the oven, raise the temperature of the oven to 200°C and keep it warm for...

Embodiment 3

[0066] A method for removing iron from a recycled Al-Si series aluminum alloy, comprising the steps of:

[0067] Step 1, weigh an aluminum block with a mass of 2Kg, weigh 5.6g 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 50 minutes; KNO in refining agent 3 、C 2 Cl 6 、Na 2 SiF 6 , KCl and graphite powder in a mass-number ratio of 8.2:1.5:5.75:6:2.

[0068] Step 2, weigh 5.6g and 3.2g of aluminum-strontium master alloy modifier respectively, put the aluminum-strontium master alloy modifier into the oven, make the temperature of the oven rise to 250°C and keep it warm for 40 minutes; the aluminum in the modifier - The content of strontium in the strontium master alloy modifier is 9%.

[0069] Step 3, weigh 40g of the iron remover, put the iron remover into the oven, raise the temperature of the oven to 250°C and keep it warm for 60 minutes;...

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Abstract

The invention discloses an iron removal method for a regenerated Al-Cu-Si series aluminum alloy. In the iron removal process, added strontium is modified to enable a needle-shaped beta-iron phase to be broken and decomposed, and primary silicon is refined, so that structure distribution is more uniform. Beta-Al5FeSi is converted to an alpha-Al3(Fe,Cr)4Si4Cu block-shaped iron phase through chromiumand settled to the bottom of a crucible. K2TiF6 is heated to be decomposed to produce Ti2+, Ti2+ is combined with Fe impurities to produce a FeTi(Fe2Ti) compound, the high melting point and the highdensity are achieved, and the iron-rich phases are settled to the bottom of the crucible under the gravity effect, so that further iron removal is achieved. Lower precipitates of aluminum liquid are filtered through a ceramic foam filter net, and an aluminum-strontium intermediate alloy modifier is added for second-time modification. Through further modification after iron removal, the residual needle-shaped iron phase is converted into the harmless block-shaped iron phase. The iron removal method has the characteristics that operation is easy, the cost is low, control is easy, and the iron content in waste aluminum is obviously decreased.

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-Cu-Si series aluminum alloys. Background technique [0002] As non-ferrous metals, aluminum and aluminum alloys are widely used for their excellent mechanical properties, corrosion resistance and electrical and thermal conductivity. Compared with the original aluminum, the aluminum alloy composed of adding different elements to the aluminum has changed various properties and can meet different needs. [0003] my country is a big country in aluminum production and consumption, but my country's aluminum resources are not rich. In view of the contradiction between the shortage of aluminum resources in my country and the increase in demand for aluminum, the recycling of waste aluminum has been put on the agenda, while meeting the needs of sustainable development. Recycled aluminum refers to scrap aluminum that has no u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C1/06C22C21/04
Inventor 庞士鹏张林周成双
Owner ZHEJIANG UNIV OF TECH