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Method for preparing aluminum-scandium intermediate alloy by using calciothermy

A technology of master alloy and reduction method, which is applied in the field of preparing aluminum-scandium master alloy by thermal reduction method, can solve problems such as hazards, and achieve the effect of simple operation and stable product

Inactive Publication Date: 2012-11-21
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

[0007] Aiming at the harm to equipment and environment caused by the large amount of fluoride used in the production process of aluminum-scandium alloy at present, the present invention provides a new production process of aluminum-scandium alloy with low fluorine micro-discharge, simple operation, stable aluminum-scandium alloy product, novel and economical

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  • Method for preparing aluminum-scandium intermediate alloy by using calciothermy

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Embodiment 1

[0028] The invention discloses a method for preparing an aluminum-scandium master alloy by a calcithermal reduction method, comprising:

[0029] 1) Calculate the weight of the raw materials aluminum, calcium metal, scandium halide or its scandium-containing molten salt, anhydrous calcium chloride and alkali metal chloride required for each furnace smelting according to the composition content of the aluminum-scandium master alloy, and weigh them respectively Pick;

[0030] 2) After mixing the flux evenly, add it into the crucible and heat it up to 700°C~1050°C to melt. The solvent is CaCl containing 75%-98% by weight 2 , and 2~25% NaCl or NaCl and KCl uniformly mixed salt, the amount of anhydrous calcium chloride in the flux is calculated according to the solubility of metal calcium in anhydrous calcium chloride molten salt is 1~15g / 100g;

[0031] 3) After the flux is fully melted, add scandium halide and keep warm in a closed protective atmosphere to obtain molten scandium-c...

Embodiment 2

[0037] On the basis of Example 1, the best implementation mode of the present invention is: metal calcium is the reducing agent, the purity of calcium is greater than 99%, and the amount of calcium is calculated according to the stoichiometric reduction reaction, adding 1 to 1.3 times of the theoretical amount. The airtight protective atmosphere is filled with vacuum inert gas protection in the vacuum induction melting furnace, and the inert gas is N 2 He or Ar. 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 crucible is a graphite crucible, a corundum crucible, an iron crucible or a tantalum crucible. During the thermal reduction reaction, a large-caliber graphite cr...

Embodiment 3

[0040] Put 68.2g of anhydrous calcium chloride and 16.5g of sodium chloride into a graphite crucible after mixing evenly, put it into a vacuum induction furnace, and after evacuating it, protect it with argon, raise the temperature to 850°C and keep it warm, and add 10.6g of scandium fluoride After the molten salt is melted, add 6.5g of calcium metal and 213.0g of aluminum ingot. After the metal is melted, stir, heat preservation and reduction smelting for 60 minutes, remove slag, add a refining agent with 5% of the weight of the aluminum ingot, heat preservation and decalcification for 30 minutes, take out the crucible, remove The slag is cast and demoulded, and cooled with water at 60~100°C. Water immersion to remove slag and weigh to obtain 203.7g of aluminum-scandium master alloy, analyzed by ICP-AES, the scandium content is 1.87%, and the recovery rate of scandium is 81.17%. The contents of other impurities Ca, Na, F, etc. are all less than 50ppm.

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Abstract

The invention discloses a method for preparing an aluminum-scandium intermediate alloy by using calciothermy. The method comprises the following steps of: (1) calculating the weights of halides of aluminum, metal calcium and scandium serving as raw materials, or scandium-containing fused salt, anhydrous calcium chloride and alkali chloride required for smelting in each furnace according to the component content of the aluminum-scandium intermediate alloy; (2) after uniformly mixing a flux, adding the flux into a crucible to smelt; (3) when the flux is completely smelted, adding scandium halide and preserving the heat in a closed protective atmosphere; (4) adding aluminum and metal calcium into the smelted scandium-containing fused salt, preserving the heat and thermally reducing for 20 to200 minutes; (5) after finishing the thermal reduction reaction, slagging off, and adding an excessive amount of refining agent to remove the calcium, when the calcium content in the alloy is less than 50ppm, casting an ingot and cooling, and performing water leaching to remove slag so as to obtain the aluminum-scandium intermediate alloy. The method disclosed by the invention has the advantages of low fluorine, micro discharge, easiness in operation, steady aluminum-scandium alloy product, novelty and economy.

Description

technical field [0001] 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 [0002] Scandium is widely used in lighting, new energy, and new metal-based materials, especially in the modification of aluminum alloys, which can play a very good role in grain refinement and inhibition of recrystallization. [0003] Aluminum-scandium master alloy can be prepared by directly mixing metal scandium and metal aluminum, but because the melting temperature difference between the two is too large, oxidation reaction will inevitably occur and the burning loss will be large. Therefore, people have studied the electrolysis method with aluminum liquid as the cathode; the metallothermal reduction method with scandium chloride, scandium oxide, and scandium fluoride as raw materials. Scandium chloride and scandium fluor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/00C22C21/00C22B5/04C22B61/00
Inventor 朱昌洛沈明伟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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