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Method for preparation of aluminum scandium alloy by alumino-thermic reduction method

A technology of aluminum scandium and alloys, which is applied in the field of preparation of aluminum rare earth master alloys, can solve the problems of easy moisture absorption, reduction mechanism and process that need to be studied, and difficult industrial scale production

Active Publication Date: 2005-04-13
HUNAN RARE EARTH METAL MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

but anhydrous ScCl 3 Difficult to prepare, easy to absorb moisture, difficult to preserve, the reduction mechanism and process need to be studied, and it is difficult to carry out industrial scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take Sc 2 o 3 : NH 4 HF 2 : NaF: alkali metal chloride: Al=3: 8: 8: 6: 80 (weight ratio). Put the crucible in the crucible resistance furnace, add Sc into the crucible 2 o 3 4 g, NH 4 HF 2 10 grams, 8 grams of NaF, several flux components of 10.8 grams of alkali metal chloride, and then add 100 grams of metal aluminum. Cover the furnace cover, heat to 850-950°C, keep warm for more than 30 minutes, open the furnace, take out the crucible, remove the slag on the alloy, then pour the alloy into the graphite mold (or copper, steel mold), knock out the slag, and weigh It is 100 grams, and the upper and lower sides of the alloy ingot are drilled on a drill press as an analysis sample. The analysis results show that it contains 2.25% Sc, and the direct recovery rate of scandium is calculated to be 86.54%.

Embodiment 2

[0021] Put the crucible in the crucible resistance furnace, add evenly mixed Sc 2 o 3 0.610 kg, add 16.45 kg of metal Al ingot, and cover the furnace cover. Heating to above 850°C, keeping it warm for more than 60 minutes, turning on the furnace, taking out the crucible, removing the flux on the alloy, pouring the alloy into a graphite mold, knocking out the slag, and weighing 16.04 kg of the alloy, taking the upper and lower parts of the alloy ingot on a drilling machine as The sample was analyzed, and the analysis result contained 2.06% Sc, and the direct recovery rate of scandium was 83.3%.

Embodiment 3

[0023] Put the crucible in the intermediate frequency furnace, build the furnace with refractory materials, and then raise the temperature. After the furnace is dried, clean it up and mix the flux: NH 4 HF 2 1.42 kg, NaF 0.464 kg, alkali metal chlorides 1.67 kg, Sc 2 o 3 Add 0.573 kg and 15.45 kg of Al to the crucible to raise the temperature and heat it to above 850°C. After the Al and flux are completely melted, keep it warm for more than 30 minutes, remove the surface flux, and pour the alloy into a graphite mold to obtain 15.11 kg of the alloy. Take a large sample Analysis, containing Sc2.2%. The direct recovery rate of scandium is 89.3%.

[0024] The method of the present invention has the advantages of extremely simple and reliable technique, low impurity content, content of Fe, Si, Ca, C and F respectively 99%, excellent performance, scandium content as high as 3%, scandium directly The yield is greater than 80%. The alloy is suitable for additives of aluminum, mag...

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Abstract

The thermit reduction process of preparing Al-Sc alloy has Sc2O3 as main material, NH4HF2, NaF and alkali metal chloride as fluorinating agent and flux, and metal aluminum as reductant and main alloy component, and through heating inside aluminum or graphite crucible at 850-1100 deg.c for some period and casting into Al-Sc alloy ingot. The Al-Sc alloy contains Sc 1-3 wt%, Al+Sc over 99 wt% and small amount of Fe, Si, Ca, C and F, each of which less than 0.05 wt%, and the process has Sc yield over 80 %. The technological process is simple and reliable, and the Al-Sc alloy has low impurity content and excellent performance, and is suitable for use as additive for various Al, Mg and other precise alloy to raise their performance obviously.

Description

[0001] Technical field: The present invention relates to a method for preparing aluminum-scandium alloy, especially a method for preparing aluminum-scandium alloy by aluminothermic reduction. The invention belongs to the technical field of aluminum rare earth master alloy preparation. Background technique: [0002] The existing preparation methods of aluminum-scandium alloy include: [0003] 1. Mixing method: [0004] The scandium metal is wrapped with aluminum foil, melted in molten aluminum under the protection of argon, kept warm for a sufficient time and fully stirred, and then cast into a mold. This method needs to use pure metal scandium as raw material, and the production cost of the alloy is high, which is difficult for users to accept. [0005] 2. Molten salt electrolysis method: [0006] in ScCl 3 -NaCl-KCl, NaF-ScF-Sc 2 o 3 , LiF-ScF 3 -Sc 2 o 3 , Na 3 AlF 6 -LiF-Sc 2 o 3 Under the protection of medium argon, the temperature is 800-1100 ℃, and the graph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B5/04C22C1/00C22C21/00
Inventor 张康宁蒋家顺张晓梅黄美松余强国
Owner HUNAN RARE EARTH METAL MATERIAL RES INST
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