Method for melting cast aluminum alloy

A technology for casting aluminum alloys and aluminum-silicon alloys, applied in the field of aluminum alloy smelting, can solve the problems of increasing alloy gas absorption and iron increase, alloy element burning loss, increased composition fluctuation, and long smelting time, so as to reduce smelting iron increase , operation time is shortened, and the effect of prolonged exposure is reduced

Active Publication Date: 2008-12-10
沈阳铸研科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 1) The degassing effect of hexachloroethane refining is good, but it pollutes the environment seriously, and increases the burning loss of alloying elements and the fluctuation of composition
[0006] 2) The multi-step process is carried out step by step, the operation is complicated, the smelting time is long and the smelting temperature is high, which further increases the gas absorption and iron increase of the alloy and deteriorates the quality of the alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Cast aluminum alloy smelting method, comprises the following steps:

[0046] 1. Clean the crucible, preheat it to 200-300°C, and spray paint; prepare various tools for smelting operation, clean it up, preheat it to 200-300°C, spray paint, and bake to remove moisture;

[0047] 2. Weigh the pre-prepared SR-1 refining and modifying refiner according to the needs of processing aluminum-silicon liquid, put it into the oven, bake at 200-300°C for 4-6 hours, set aside, SR-1 refining The metamorphic refiner consists of 10kg of NaNO 3 , 13kg of BaCl 2 , 10kg of NaF, 13kg of Na 3 AlF 6 , 21kg of K 2 TiF 6 、6kg of KBF 4 , 13kg of NaCl and 10kg of C powder.

[0048] 3. Furnace loading and melting: after spraying the coating on the crucible, the furnace can be loaded after the coating is dry. First, recycle materials are added, and then pure aluminum ingots are added. After the molten aluminum temperature reaches 700°C, pure silicon and aluminum are added. The silicon ratio ...

Embodiment 2

[0052] The process steps of the cast aluminum alloy smelting method in the second embodiment are basically the same as those in the first embodiment, except that the temperature for adding pure silicon to the molten aluminum is 700°C. SR-1 refining metamorphic refiner consists of 12kg of NaNO 3 , 15kg of BaCl 2 , 12kg of NaF, 15kg of Na 3 AlF 6 , 23kg of K 2 TiF 6 , 8kg of KBF 4 , 15kg of NaCl and 12kg of C powder. Add when the temperature of the aluminum-silicon liquid reaches 715° C., and the addition amount is 2.4% of the weight of the aluminum-silicon liquid.

Embodiment 3

[0054] The process steps of the casting aluminum alloy smelting method in the third embodiment are basically the same as those in the first embodiment, except that the temperature for adding pure silicon to the molten aluminum is 712°C. SR-1 refining metamorphic refiner consists of 14kg of NaNO 3 , 17kg of BaCl 2 , 14kg of NaF, 17kg of Na 3 AlF 6 , 25kg of K 2 TiF 6 , 10kg of KBF 4 , 17kg of NaCl and 14kg of C powder. Add when the temperature of the aluminum-silicon liquid reaches 715°C, and the amount added is 2.6% of the weight of the aluminum-silicon liquid.

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Abstract

This invention discloses a method for smelting Al alloy. The method comprises: melting pure Al in a crucible, adding pure Si when the Al melt temperature reaches 690-720 deg.C, adding refinery-modification agent when the Si-Al melt temperature reaches 700-730 deg.C, and pressing with a salt-soaking spoon to a distance 100-150 mm away from the crucible bottom. The refinery-modification agent is composed of: NaNO3 10 kg, BaCl2 13 kg, NaF 10 kg, Na3AlF6 13 kg, K2TiF6 21 kg, KBF4 6 kg, NaCl 13 kg, and carbon powder 10 kg. The method can realize smelting, refinery and modification of Al alloy in one step, thus can shorten the operation time, reduce the Fe content in Al alloy, improve Al alloy quality, and reduce environmental pollution.

Description

(1) Technical field [0001] The invention relates to an alloy smelting method, in particular to an aluminum alloy smelting method in which refining, modification and refinement are completed in one step during aluminum alloy smelting. (2) Background technology [0002] Alloy smelting is an important link to ensure the internal quality of alloys and the performance of castings. Most of the previous alloy smelting processes used hexachloroethane refining and ternary modifiers to deteriorate. This is the process that my country's aluminum alloy smelting has always followed. are carried out separately, so it is called multi-step method here, and its process principle is C 2 Cl 6 The C produced by the reaction in the molten aluminum 2 Cl 4 , AlCl 3 , Cl 2 Adsorb H in the aluminum liquid during the floating process 2 and oxidized inclusions, so as to achieve the purpose of refining, but the escaped C 2 Cl 4 , Cl 2 And the generated HCl gas is harmful to the human body, corr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/06C22C21/02
Inventor 冯志军荣福杰高海峰夏志敏
Owner 沈阳铸研科技有限公司
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