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Method for removing zinc in renewable aluminum

A technology for recycled aluminum and metal zinc, applied in the field of zinc removal, can solve the problems of increased production cost of recycled aluminum, contamination of recycled aluminum raw materials, fluctuations in composition and quality of recycled aluminum products, etc., so as to reduce the amount of primary aluminum used and production costs. , The effect of removing zinc is obvious

Inactive Publication Date: 2009-09-16
ALUMINUM CORP OF CHINA QINGDAO LIGHT METAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These factors make it difficult to control the composition of recycled aluminum in the later stage of production. The composition and quality of recycled aluminum products fluctuate with the composition of waste aluminum raw materials, which directly affects the production cost and product quality of recycled aluminum.
Among them, the zinc element with a high content in the recycled aluminum raw material is a harmful impurity element for the subsequent production of recycled aluminum and needs to be removed. However, there is no effective way to remove the zinc element in the melt in the production of recycled aluminum at present. The recycled aluminum raw material with high zinc content There are great restrictions on the production and use of recycled aluminum
At present, due to the different sources of recycled aluminum raw materials, the raw materials may contain zinc alloys or aluminum-zinc alloys with high zinc content, and the zinc alloys can be removed by manual sorting. Manual sorting requires experienced sorters, so the actual sorting effect is not good, and the zinc content in the recycled aluminum melt is still high in subsequent production
As for the aluminum-zinc alloy raw materials, in the follow-up production of recycled aluminum, the only way to reduce the input of such raw materials and increase the input of primary aluminum is to carry out smelting production, reduce the content of zinc element, and make the production of recycled aluminum in the later stage The cost increases, and the economic efficiency of the production and use of secondary aluminum raw materials decreases, which directly affects the economic benefits of secondary aluminum enterprises

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Preliminary sorting of recycled aluminum raw materials with a zinc content of 10% to remove non-metallic impurities such as paper dust and metal impurities of non-aluminum metals, and heat and melt the recycled aluminum after primary sorting in a melting furnace to form recycled aluminum melt , and then pump the regenerated aluminum melt into a vacuum furnace for vacuum distillation, so that the metal zinc in it forms zinc vapor and discharges it. The vacuum degree of vacuum distillation is 10 Pa, the temperature of vacuum distillation is 700 ° C, vacuum distillation is 25 minutes, after The zinc content in the recycled aluminum melt was reduced to 0.0056% after vacuum distillation.

Embodiment 2

[0014] Preliminary sorting of recycled aluminum raw materials with a zinc content of 20% to remove non-metallic impurities such as paper dust and metal impurities of non-aluminum metals, and heat and melt the recycled aluminum after primary sorting in a melting furnace to form recycled aluminum melt , and then the regenerated aluminum melt is pumped into a vacuum furnace for vacuum distillation, so that the metal zinc in it forms zinc vapor and is discharged. The vacuum degree of vacuum distillation is 50Pa, the temperature of vacuum distillation is 800°C, and the vacuum distillation takes 15 minutes. The zinc content in the recycled aluminum melt was reduced to 0.071% after vacuum distillation.

Embodiment 3

[0016] Preliminary sorting of recycled aluminum raw materials with a zinc content of 15% to remove non-metallic impurities such as paper scraps and non-aluminum metal impurities, and heat and melt the primary sorted recycled aluminum in a smelting furnace to form recycled aluminum melt , and then pump the regenerated aluminum melt into a vacuum furnace for vacuum distillation, so that the metal zinc in it forms zinc vapor and discharges it. The vacuum degree of vacuum distillation is 20Pa, the temperature of vacuum distillation is 750°C, and the vacuum distillation is 30 minutes. The zinc content in the recycled aluminum melt was reduced to 0.015% after vacuum distillation.

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Abstract

The invention discloses a method for removing zinc in renewable aluminum, and the method comprises the following steps: a. renewable aluminum raw material is heated and melted to form a renewable aluminum melt; b. the vacuum distillation is carried out on the renewable aluminum melt in the step a to lead metal zinc therein to form steam to be discharged. The vacuum degree of the vacuum distillation is 10-50Pa, the temperature of the vacuum distillation is 650-800 DEG C, and the time of the vacuum distillation is 5-30 minutes. The method for removing the zinc in the renewable aluminum can effectively remove zinc impurities in the renewable aluminum, and the content of zinc element in the renewable aluminum melt after the vacuum distillation is not more than 0.5 percent, thereby having significant zinc removal effect, greatly reducing the using amount of primary aluminum in the late-stage component adjustment, facilitating the component adjustment of the follow-up production of the renewable aluminum, simultaneously increasing the using amount of the renewable aluminum raw material with high zinc content, greatly reducing the production cost of the renewable aluminum and improving the economy of the renewable aluminum raw material on the production and the use.

Description

technical field [0001] The invention relates to a method for removing zinc, in particular to a method for removing zinc from secondary aluminum. Background technique [0002] Due to the various sources of recycled aluminum raw materials, there are differences in chemical composition and element content. These factors make it difficult to control the composition of recycled aluminum in the later stage of production. The composition and quality of recycled aluminum products fluctuate with the composition of scrap aluminum raw materials, which directly affects the production cost and product quality of recycled aluminum. Among them, the zinc element with a high content in the recycled aluminum raw material is a harmful impurity element for the subsequent production of recycled aluminum and needs to be removed. However, there is no effective way to remove the zinc element in the melt in the production of recycled aluminum at present. The recycled aluminum raw material with high ...

Claims

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Application Information

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IPC IPC(8): C22B21/06C22B9/02
CPCY02P10/20
Inventor 李中李晓鹏于海杨传增刘庆德
Owner ALUMINUM CORP OF CHINA QINGDAO LIGHT METAL
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