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Method for efficiently regenerating cast aluminum alloy by aluminum scraps

A high-efficiency regeneration technology for casting aluminum alloys, which is applied in the field of non-ferrous metal smelting, can solve problems such as weak adaptability of waste aluminum, poor quality of recycled aluminum, and low recovery rate of waste aluminum, so as to ensure quality stability, low cost, and reduce harmful The effect of action

Inactive Publication Date: 2013-07-17
YUNNAN AOKAI TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the advanced technology introduced and the self-developed DDF technology have high requirements for pre-treatment, the adaptability to waste aluminum is weak, and the investment is huge, the process is complicated, and the cost is high, so it is difficult to adapt to the small scale and waste aluminum recycling industry in my country. The reality of complex sources is the main reason why most waste aluminum recycling enterprises still use the original smelting method, which is easy to pollute the environment, and the recovery rate of waste aluminum is low, the quality of recycled aluminum is poor, and the energy consumption of smelting is high.

Method used

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  • Method for efficiently regenerating cast aluminum alloy by aluminum scraps

Examples

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Effect test

Embodiment 1

[0036] Take 500kg of recycled aluminum chips, manually sort to remove impurities, remove iron filings by electromagnetic screening, bake at 200°C for 10 minutes, and then press to obtain prefabricated aluminum blocks; add prefabricated aluminum chips to a round top-opening aluminum melting furnace Heat to melt and mechanically stir evenly to remove unmelted impurities and scum on the surface; then add 1.35kg of NaCl and 1.65kg of KCl eutectic mixture as solvent; 50kg of Si and 4.5kg of Fe are evenly melted into the molten aluminum by electromagnetic stirring, then continue to heat the molten aluminum to 1000°C, keep the temperature for 1 hour, and then cool down with the furnace until the temperature of the molten aluminum is 740°C to remove floating slag; The molten aluminum comes out of the furnace and is poured into an aluminum ingot casting mold to obtain a recycled cast aluminum alloy ingot.

Embodiment 2

[0038]Take 300kg of recycled aluminum chips and 900kg of recycled miscellaneous aluminum blocks, manually sort to remove impurities, respectively remove iron filings through electromagnetic screening, and then bake at 300°C for 6 minutes before being released from the oven, and the aluminum chips are pressed to obtain prefabricated aluminum blocks; the prefabricated aluminum chips and The miscellaneous aluminum blocks are alternately put into the reverberatory furnace to heat and melt, and use permanent magnetic stirring to evenly remove unmelted impurities and scum on the surface; then add 1.6kg of NaCl, 1.85kg of KCl, and 0.15kg of NaCl 3 AlF 6 The mixture is used as a solvent; after the solvent is completely melted, when the temperature of the molten aluminum reaches 740°C, add 108kg of Si and 13kg of Fe, and use electromagnetic stirring to melt them evenly into the molten aluminum, then continue to heat the molten aluminum to 950°C, and then After heat preservation for 1.5...

Embodiment 3

[0040] Take 800kg of recycled miscellaneous aluminum, after mechanical crushing, manual sorting to remove impurities, and electromagnetic screening to remove iron filings, and then bake at 250°C for 12 minutes before being released from the furnace; add prefabricated miscellaneous aluminum into the reverberatory furnace to heat and melt, and use electromagnetic stirring to evenly , to remove unmelted impurities and scum on the surface; then add 0.3kg of graphite, 1.5kg of NaNO 3 , 1kg of NaCl and 1.2kg of refractory brick debris mixture as a solvent; after the solvent is completely melted, when the temperature of the molten aluminum reaches 700°C, add 80kg of Si and 6.4kg of Fe, and use electromagnetic stirring to make it evenly melt into the aluminum After melting, continue to heat the molten aluminum to 1030°C, keep the temperature for 0.8 hours, and then cool it down with the furnace until the temperature of the molten aluminum is 760°C to remove floating slag; the molten al...

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Abstract

The invention discloses a method for efficiently regenerating cast aluminum alloy by aluminum scraps. The method for efficiently regenerating cast aluminum alloy by aluminum scraps comprises the following processes of: screening, smelting, alloy-mixing and pouring, wherein the screening process specifically comprises the following step of: removing impurities and moisture in the aluminum scraps; the smelting process specifically comprises the step of melting and stirring the aluminum scraps after the screened aluminum scraps are charged, so that the slag is removed; the alloy-mixing process specifically comprises the following steps of: adding 9%-11% (in percentage by weight) of Si and 0.8%-1.1% of Fe when the temperature of the impurity-removed aluminum scrap solution reaches 680 DEG C to 740 DEG C, keeping the temperature after the components are uniformly stirred and removing the slag; and the casting process specifically comprises the following step of: pouring the slag-removed molten aluminum to the mould to obtain the cast aluminum alloy ingot or the aluminum alloy casting piece. According to the method for efficiently regenerating cast aluminum alloy by aluminum scraps, the aluminum scraps are enabled to reach the technical requirements of the cast aluminum alloy by aluminum scrap screening and alloy mixing, and therefore, the method has the advantages of being simple in process, strong in aluminum scrap adaptability, stable in aluminum alloy stability, low in cost, and high in aluminum recycling rate.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal smelting, and in particular relates to a method for efficiently recycling cast aluminum alloys from waste aluminum with simple process, strong adaptability to waste aluminum, stable quality of aluminum alloys, low cost and high aluminum recovery rate. Background technique [0002] Aluminum and aluminum alloys have low density, high specific strength, corrosion resistance, oxidation resistance, electrical conductivity and thermal properties second only to silver and copper, and have good processability, non-toxicity, good low-temperature reflection performance, non-magnetic, non-toxic Sparks, beautiful surface gloss, surface coating and other special properties. It is widely used in construction, transportation, national defense, packaging and other industries and fields of daily life. my country is a big producer and consumer of aluminum products. However, my country's bauxite resources...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/06C22C21/00
Inventor 方春富
Owner YUNNAN AOKAI TECH DEV
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