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Aluminum alloy refining agent containing rare earth compounds and preparation method for same

A rare earth compound and refining agent technology, which is applied in the field of aluminum alloy processing, can solve the problem of high content of non-metallic inclusions, achieve good impurity removal effect, reduce metal burning loss, and uniform microstructure compactness

Inactive Publication Date: 2018-03-02
广西平果铝合金精密铸件有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a rare earth compound-containing aluminum alloy refining agent and its preparation method to solve the problems of high hydrogen content and non-metallic inclusion content in aluminum alloys, and to reduce the gas content in aluminum alloy melts and non-metallic inclusion content targets to improve the performance of aluminum alloy materials

Method used

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  • Aluminum alloy refining agent containing rare earth compounds and preparation method for same
  • Aluminum alloy refining agent containing rare earth compounds and preparation method for same

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preparation example Construction

[0024] The preparation method of the aluminum alloy refining agent containing the rare earth compound comprising the above raw materials and components comprises the following steps:

[0025] S1: La 2 o 3 Dissolve in hydrochloric acid and dilute to 120-130g / L, heat the solution to 72-75°C, add 48% hydrofluoric acid, stir to obtain a precipitate, then wash, filter, and dry the precipitate until the water content is ≤2% , crushed to a particle size of ≤2mm, and dehydrated under the condition of a vacuum of 0.5-0.8MPa to obtain F 3 La powder;

[0026] S2: put Nd 2 o 3 Dissolve in hydrochloric acid and dilute to 120-130g / L, heat the solution to 72-75°C, add 48% hydrofluoric acid, stir to obtain a precipitate, then wash, filter, and dry the precipitate until the water content is ≤2% , Grinding to particle size ≤ 2mm, and dehydrating under the condition of vacuum degree of 0.5-0.8MPa to obtain FNd powder;

[0027] S3: KCl, BaSO 4 、KNO 3 , A1F 3 , CaS, Na 3 A1F 6 、Na 2 Si...

Embodiment 1

[0030] A refining agent for aluminum alloy containing rare earth compounds, in parts by weight, comprising the following components: 50 parts of KCl, BaSO 4 15 copies, KNO 3 30 copies, A1F 3 11 parts, 4 parts of CaS, Na 3 A1F6 10 parts, Na 2 SiF 6 3 parts, FNd 0.6 parts, F 3 0.5 parts of La, 0.6 parts of graphite;

[0031] The preparation method of the aluminum alloy refining agent containing the rare earth compound comprising the above raw materials and components comprises the following steps:

[0032] S1: La 2 o 3 Dissolve in hydrochloric acid and dilute to 130g / L, heat the solution to 75°C, add 48% hydrofluoric acid, stir to obtain a precipitate, then wash, filter, dry the precipitate to a water content of ≤2%, and crush to particle size ≤2mm, dehydration under the condition of vacuum degree of 0.6MPa to get F 3 La powder;

[0033] S2: put Nd 2 o 3 Dissolve in hydrochloric acid and dilute to 130g / L, heat the solution to 75°C, add 48% hydrofluoric acid, sti...

Embodiment 2

[0037] A refining agent for aluminum alloy containing rare earth compounds, in parts by weight, comprising the following components: 60 parts of KCl, BaSO 4 10 copies, KNO 3 40 copies, A1F 3 7 parts, CaS 9 parts, Na 3 A1F 6 8 parts, Na 2 SiF 6 2 parts, FNd 0.3 parts, F 3 1.1 parts of La, 0.3 parts of graphite;

[0038] The preparation method of the aluminum alloy refining agent containing the rare earth compound comprising the above raw materials and components comprises the following steps:

[0039] S1: La 2 o 3 Dissolve in hydrochloric acid and dilute to 125g / L, heat the solution to 74°C, add 48% hydrofluoric acid, stir to obtain a precipitate, then wash, filter, dry the precipitate to a water content of ≤2%, and crush to particle size ≤2mm, dehydration under the condition of vacuum degree of 0.5MPa to get F 3 La powder;

[0040] S2: put Nd 2 o 3 Dissolve in hydrochloric acid and dilute to 125g / L, heat the solution to 74°C, add 48% hydrofluoric acid, stir t...

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Abstract

The invention discloses an aluminum alloy refining agent containing rare earth compounds and a preparation method for same and belongs to the technical field of aluminum alloy processing. The refiningagent includes, by weight, 55 parts of KCl, 20 parts of BaSO4, 35 parts of KNO3, 8 parts of AlF3, 6 parts of CaS, 7 parts of Na3AlF6, 5 parts of Na2SiF6, 0.4 parts of FNd, 0.7 parts of F3La, and 0.5parts of graphite. In the invention, Al2O3 is dissolved in the Na2SiF6 and is reduced with the FNd and F3La, wherein the main components are not chemically reacted with aluminum, and at high temperature, gases, such as N2, CO2 and NO, which are not fused in aluminum alloy melt, can be generated due to heat energy of the refining agent, thus refining and purifying the aluminum alloy. The refining agent can remove foreign matters of small-size oxides at high efficiency and is good in purification effect.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy processing, and in particular relates to an aluminum alloy refining agent containing rare earth compounds and a preparation method thereof. Background technique [0002] China ranks third in the world's aluminum consumption rankings. Although China's aluminum production ranks second in the world, most of the aluminum used in China is imported, and it is the world's largest aluminum importer. The reason for this situation is that China's aluminum industry is still far behind advanced countries in terms of production process control, product quality control, and production scale. Most importantly, China's lack of capacity and a large gap in the supply of high-quality aluminum billets are the main problems. In the process of smelting and casting, aluminum and its alloys are easily oxidized and absorb gas. This characteristic makes gas and inclusions easy to form in molten aluminum, which in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C21/00
CPCC22C1/06C22C21/00
Inventor 梁春才梁健梁祥友
Owner 广西平果铝合金精密铸件有限公司
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