Multi-stage impurity removing and refining method in production process of secondary aluminum

A production process and technology for reclaiming aluminum, applied in the field of metal materials, can solve the problems of high impurity components and oxidized slag inclusions, limited addition of scrap aluminum, and difficulty in using scrap aluminum, so as to reduce oxide inclusion defects and improve mechanical properties. performance, the effect of improving purity

Active Publication Date: 2013-06-12
天津新立中合金集团有限公司
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Problems solved by technology

Its disadvantages are that the composition is difficult to control, the proportion of waste miscellaneous aluminum is limited, the use of low-qual

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  • Multi-stage impurity removing and refining method in production process of secondary aluminum

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Embodiment 1

[0043] A multi-stage impurity removal and refining method in the production process of secondary aluminum. In this example, DSM.AlSi9Cu3(Fe) alloy is prepared, and the steps are as follows:

[0044] ⑴Pretreatment: Screen waste aluminum slices, first manually wash and screen out non-metallic waste such as soil, plastic, rubber, etc. on the operating table, and then select large pieces of copper, zinc, steel, etc., to obtain relatively pure waste aluminum slices for later use .

[0045] (2) Put the pretreated scrap aluminum slices into a 10T high-temperature and low-pressure paint removal furnace, set the temperature at 500°C, and heat for 4 hours to remove paint, grease, and moisture.

[0046] ⑶ The total ingredients are 15000Kg, according to the requirements of the alloy composition (Si: 10.1 ~ 10.9; Mg: 0.16 ~ 0.28; Fe: 0.71 ~ 0.93; Cu: 2.6 ~ 3.4; the sum of impurities ≤ 0.24; Al is the balance) to weigh the required amount 1500 Kg of industrial pure aluminum, 300Kg of indus...

Embodiment 2

[0055] A step-by-step impurity removal and purification method for the production of recycled aluminum. The SL.AC4B(X) alloy is prepared in this example. The steps are as follows:

[0056] ⑴Pretreatment: Screen waste aluminum slices, first manually wash and screen out non-metallic waste such as soil, plastic, rubber, etc. on the operating table, and then select large pieces of copper, zinc, steel, etc., to obtain relatively pure waste aluminum slices for later use .

[0057] (2) Put the pretreated scrap aluminum slices into a 10T high-temperature and low-pressure paint removal furnace, set the temperature at 500°C, and heat for 4 hours to remove paint, grease, and moisture.

[0058] ⑶ The total ingredients are 16000Kg, according to the alloy composition requirements (Si: 7.6-8.9; Mg: 0.18-0.38; Fe: ≤0.53; Cu: 2.6-3.8; Ti: 0.11-0.14; Mn: 0.22-0.48; the sum of impurities ≤ 1.0 ; Al is surplus) take by weighing required amount of industrial pure aluminum 6832 Kg, industrial sili...

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Abstract

The invention relates to a multi-stage impurity removing and refining method in the production process of secondary aluminum. The method comprises the following steps of: (1) pretreating, wherein pure aluminum scraps are obtained for standby; (2) removing paint; (3) preparing material; (4) drying; (5) melting; (6) mixed melting; (7) refining, degassing and deslagging; (8) adjusting components; (9) re-degassing until pinholes are qualified, standing, and removing hydrogen in the melt thoroughly; and (10) when the temperature reaches 680-720 DEG C, casting cast ingots of the secondary aluminum product. According to the method, physical and chemical methods are integrated, from screening in the pretreating process and drying and preheating for removing dirt, corrosion and oils on the surface of the waste aluminum, to the melting process and refining process for removing inserts in the waste aluminum parts, a rare earth type modifier is used, so that not only the mechanical property of aluminum melt can be improved, but also the melt can be effectively purified; and meanwhile, a refining agent and an inert gas combined refining method are adopted to control impurities and hydrogen content, so that the waste aluminum can be gradually purified.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a multi-stage impurity-removing and refining method in the production process of secondary aluminum. Background technique [0002] Recycled aluminum is aluminum ingots that meet the requirements of various standards produced by smelting and preparing recycled aluminum scrap parts or scraps in the process of producing aluminum products, scrap aluminum wires and other scrap aluminum as the main raw materials. The excellent properties of scrap aluminum can be reproduced through steps such as screening, remelting, refining and purification, and adjusting chemical composition. Waste miscellaneous aluminum is mainly made into various cast aluminum alloys and deformed aluminum alloys, and then processed into recycled aluminum products such as aluminum castings or plastically processed aluminum materials. [0003] Since the raw material of recycled aluminum is mainly waste miscellaneous a...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B21/06
CPCY02P10/20
Inventor 王如芬李志琴艾振海王明立齐宝莲
Owner 天津新立中合金集团有限公司
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