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Calcium remover for aluminum alloys as well as preparation and use method of calcium remover

A technology of calcium remover and aluminum alloy, which is applied in the field of aluminum alloy smelting, can solve the problems of high cost and complicated preparation process of the calcium remover, and achieves the effect of wide application range, flexible use method and elimination of chlorine pollution.

Inactive Publication Date: 2016-06-29
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the decalcifier is complicated and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The aluminum alloy calcium remover of the present invention comprises the following components in parts by mass: 60 parts of sodium phosphate and 40 parts of molten salt.

[0031] Further, described sodium phosphate is industrial sodium phosphate dodecahydrate (Na 3 PO 4 .12H 2 O).

[0032] Further, the molten salt is a mixture of magnesium chloride, potassium chloride and sodium chloride, and the mass ratio of magnesium chloride, potassium chloride and sodium chloride in the mixture is 1:1:8.

[0033] The preparation method of aluminum alloy calcium remover of the present invention, comprises the following steps:

[0034] S1, preparing molten salt: mix magnesium chloride, sodium chloride, and potassium chloride in a mass ratio of 1:1:8, mix them evenly, and heat to 410° C. to melt the mixture to obtain liquid molten salt;

[0035] S2, add sodium phosphate: add sodium phosphate of required quality into liquid molten salt in batches, heat while adding and stirring un...

Embodiment 2

[0043] The aluminum alloy calcium remover of the present invention comprises the following components in parts by mass: 70 parts of sodium phosphate and 30 parts of molten salt.

[0044] Further, described sodium phosphate is industrial sodium phosphate dodecahydrate (Na 3 PO 4 .12H 2 O).

[0045] Further, the molten salt is a mixture of magnesium chloride, potassium chloride and sodium chloride, and the mass ratio of magnesium chloride, potassium chloride and sodium chloride in the mixture is 1:1:8.

[0046] The preparation method of aluminum alloy calcium remover of the present invention, comprises the following steps:

[0047] S1, preparing molten salt: the mass ratio of magnesium chloride, sodium chloride and potassium chloride is 1:1:8. After mixing evenly, heat to 500°C to melt the mixture to obtain liquid molten salt;

[0048] S2, add sodium phosphate: add sodium phosphate of required quality into liquid molten salt in batches, heat while adding and stirring, until...

Embodiment 3

[0056] The aluminum alloy calcium remover of the present invention comprises the following components in parts by mass: 80 parts of sodium phosphate and 20 parts of molten salt.

[0057] Further, described sodium phosphate is industrial sodium phosphate dodecahydrate (Na 3 PO 4 .12H 2 O).

[0058] Further, the molten salt is a mixture of magnesium chloride, potassium chloride and sodium chloride, and the mass ratio of magnesium chloride, potassium chloride and sodium chloride in the mixture is 1:1:8.

[0059] The preparation method of aluminum alloy calcium remover of the present invention, comprises the following steps:

[0060] S1, preparing molten salt: the mass ratio of magnesium chloride, sodium chloride and potassium chloride is 1:1:8. After mixing evenly, heat to 450°C to melt the mixture to obtain liquid molten salt;

[0061] S2, add sodium phosphate: add sodium phosphate of required quality into liquid molten salt in batches, heat while adding while stirring, unt...

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Abstract

The invention relates to the field of melting of aluminum alloys, in particular to a calcium remover for aluminum alloys as well as a preparation and use method of the calcium remover. The calcium remover for the aluminum alloys is prepared from the following components in parts by mass: 60-80 parts of calcium phosphate, and 20-40 parts of fused salt. The calcium remover is prepared through the following steps of mixing magnesium chloride with potassium chloride and sodium chloride, performing heating to make the fused salt, adding the calcium phosphate according to the required mass into the fused salt, performing heating, and performing heat insulation so as to obtain a melted calcium remover; or casting the melted calcium remover in a mold, performing cooling and solidifying to obtain a solid calcium remover, and performing sealing packaging for standby application. Compared with the prior art, the calcium remover for the aluminum alloys, disclosed by the invention, is friendly in operating environment, flexible in using method, broad in application scope, and high in calcium removing efficiency. When the calcium remover which is 0.5% of melted aluminum alloy is added, the content of calcium in the aluminum alloys can be reduced from 0.015% to 0.002%.

Description

technical field [0001] The invention relates to the field of aluminum alloy smelting, in particular to an aluminum alloy decalcifying agent and a preparation and use method thereof. Background technique [0002] The solubility of calcium in aluminum is extremely low, often referred to as Al 4 Ca compounds exist. When the calcium content is high, the fluidity of the aluminum alloy decreases, and it is easy to absorb air to produce micro pinholes and shrinkage porosity, resulting in an increase in the scrap rate and a decrease in the mechanical properties of the material. Therefore, how to reduce calcium in aluminum alloys is a common concern. [0003] In the prior art, in order to remove calcium, a chlorine-containing refining agent is usually used, but this refining agent will release a large amount of chlorine gas during use, polluting the environment. According to foreign reports, the use of Al-C master alloys can remove calcium, but the cost is too high to be widely us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C21/00
CPCC22C1/06C22C1/026
Inventor 程炳超张佳虹
Owner BEIJING JIAOTONG UNIV
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