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Method for preparing aluminum-scandium master alloy by thermal reduction of aluminum-calcium alloy

An aluminum-calcium alloy and master alloy technology is applied in the field of aluminum-scandium master alloy preparation, and achieves the effects of simple operation, low production energy consumption, and simple and feasible technological process.

Inactive Publication Date: 2011-10-19
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the complexity of process equipment and deficiencies in operation in the production of the above-mentioned aluminum-scandium alloy, the present invention provides an aluminum alloy with simple operation, simple equipment, high recovery rate of metal scandium, low production energy consumption, little environmental pollution and stable economy. Scandium alloy production method

Method used

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  • Method for preparing aluminum-scandium master alloy by thermal reduction of aluminum-calcium alloy

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Embodiment 1

[0027] The invention discloses a method for preparing an aluminum-scandium master alloy by thermal reduction of an aluminum-calcium alloy, comprising:

[0028] 1) Calculate the weight of the raw materials aluminum-calcium alloy, scandium halide or its molten salt and alkali metal chloride required for each furnace smelting according to the composition content of the aluminum-scandium master alloy, and weigh them respectively;

[0029] 2) Mix scandium halide or its molten salt and alkali metal chloride evenly into the crucible and heat up to 750°C~950°C to melt to obtain molten scandium-containing molten salt;

[0030] 3) adding the aluminum-calcium alloy into the molten scandium-containing molten salt, and after the aluminum-calcium alloy is melted, heat-reduce for 20-200 minutes;

[0031] 4) After the thermal reduction reaction is completed, add excess refining agent to remove calcium, and when the calcium content in the alloy is less than 50ppm, pour the ingot and cool it, a...

Embodiment 2

[0034] On the basis of Example 1, the best implementation mode of the present invention is: in the aluminum-calcium alloy, the calcium content is 3% to 20% by weight, and the balance is aluminum and unavoidable impurities. Scandium halides are anhydrous scandium halides or scandium-containing molten salts prepared by chemical methods, and the anhydrous scandium halides are anhydrous scandium chloride, anhydrous scandium fluoride, anhydrous scandium bromide or anhydrous scandium iodide , requires complete dehydration, scandium halide content of 1% to 25% of the molten salt. The alkali metal halide is one or two mixtures of sodium chloride and potassium chloride, the weight ratio of sodium chloride and potassium chloride in the mixture is: 75-98:25-2, the amount of alkali metal halide is 0.1~1.5 times the weight of aluminum-calcium alloy. The crucible is graphite crucible, corundum crucible, iron crucible or tantalum crucible. The refining agent is a refining slag system compo...

Embodiment 3

[0037] Weigh 42.6g of sodium chloride, 42.6g of potassium chloride, and 10.6g of scandium fluoride, mix them evenly and add them into a graphite crucible, heat up to 800°C, and add 213.0g of aluminum-calcium alloy with a calcium content of 3.2% after the molten salt melts, After the aluminum-calcium alloy is melted, heat-reduce and smelt for 20 minutes, add 4% aluminum-calcium alloy refining agent to heat-reduce and decalcify for 30 minutes, take out the crucible, remove slag, cast and demould, and cool with water at 60-100°C. 212.3 g of aluminum-scandium master alloy was obtained by weighing after removing slag, and analyzed by ICP-AES, the scandium content was 2.06%, and the recovery rate of scandium was 93.2%. The contents of other impurities Ca, Na, F, etc. are all less than 50ppm. Slag recycling.

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Abstract

The invention discloses a method for preparing an aluminum-scandium master alloy by thermal reduction of an aluminum-calcium alloy. The method includes the steps as follows: firstly, by the contents of components in the aluminum-scandium master alloy, calculating the weight of the material aluminum-calcium alloy, the halide or the molten salt of scandium, and alkali chloride which are needed for smelting in every furnace; secondly uniformly mixing the halide or the molten salt of scandium with alkali chloride, adding the mixture into a crucible, raising temperature to 750-950 DEG C for melting the mixture, thus obtaining molten salt containing scandium; thirdly, adding the aluminum-calcium alloy into the molten salt containing scandium and after the aluminum-calcium alloy melts, keeping temperature and conducting thermal reduction for 20-200min; and fourthly, after the thermal reduction reaction finishes, adding excessive refining agent to remove calcium; and when the content of the calcium in the alloy is less than 50ppm, pouring and cooling a cast ingot, and then conducting water leaching for deslagging, thus obtaining the aluminum-scandium master alloy. The technology is simple and feasible in flow, high in metal yield, simpler and more environment-friendly than the traditional method and capable of realizing green production; and the method has the advantages of being simple in operation and equipment, low energy consumption in production, less pollution to the environment and economic stability.

Description

[0001] technical field [0002] The invention relates to the technical field of preparation of an aluminum-scandium master alloy, in particular to a method for preparing an aluminum-scandium master alloy by a thermal reduction method. Background technique [0003] Scandium is widely used in aluminum alloys, and plays the most effective role in grain refinement and recrystallization inhibition for aluminum alloys so far. The nature of scandium is lively, and the melting point of scandium and aluminum is very different. Therefore, adding scandium to aluminum alloy is usually added in the form of an intermediate alloy. In recent years, the market demand for high-performance aluminum-scandium alloys has increased, and the preparation of aluminum-scandium master alloys has also attracted the attention and research of many metallurgists. [0004] At present, the production methods of aluminum-scandium alloy include pairing method, molten salt electrolysis method, aluminothermic r...

Claims

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Application Information

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IPC IPC(8): C22C1/00C22C21/00C22B5/04C22B61/00
Inventor 沈明伟朱昌洛冀成庆蔡旺钱应敏马新华毛利
Owner INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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