Lanthanum cerium-magnesium intermediate alloy and production method thereof

A master alloy and production method technology, applied in the field of preparation of rare earth magnesium master alloy products, can solve the problems of master alloy impurity content not meeting the requirements, rare earth element production and sales imbalance, material and energy consumption, etc., to achieve a wide range of rare earth content, The effect of alleviating the imbalance between production and marketing and promoting sustainable development

Inactive Publication Date: 2014-02-05
扬州宏福铝业有限公司 +1
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AI Technical Summary

Problems solved by technology

[0003] Over the years, the bottleneck problem in the development of the rare earth industry is the unbalanced production and sales of rare earth elements, namely: praseodymium and neodymium in light rare earths are in short supply and the price is high, about 250,000 yuan per ton of metal, while producing one ton of metal neodymium or praseodymium costs about 4 tons of lanthanum and cerium residues are produced, and the price of each ton of lanthanum and cerium metal is about 30,000 yuan, resulting in a large backlog of lanthanum and cerium, which urgen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 65g KCl, 7g anhydrous MgCl respectively 2 Mix rare earth chloride with 28g of lanthanum cerium containing 1 to 2 crystal waters to form an electrolyte system after mixing.

[0016] The graphite crucible is used as the electrolytic cell and anode, the molybdenum rod is used as the cathode, and the magnesium oxide crucible is used as the alloy susceptor.

[0017] Using the co-electrodeposition method, the anode current density of the electrolysis process is controlled to be 0.6-0.7A / cm 2 , the cathode current density is 3~4A / cm 2 , the voltage is 10-12V, the current is 1200-1400A, and the temperature is 750-800°C. After 2 hours of electrolysis, 2.5kg of lanthanum-cerium-magnesium master alloy with RE content of 30-40% is obtained in the alloy susceptor.

[0018] After analyzing the alloy, La: 40%; Ce: 55%; Pr is less than 0.5%; Nd is less than 0.01%. The content of impurities is low, among which Fe%<0.05%, Cu<0.01%, Ni<0.01%, Si<0.02%; the rest is magnesium.

[...

Embodiment 2

[0021] Weigh 66g KCl, 5g anhydrous MgCl respectively 2 Mix rare earth chloride with 35g of lanthanum cerium containing 1 to 2 crystal waters to form an electrolyte system after mixing.

[0022] Using the co-electrodeposition method, the anode current density of the electrolysis process is controlled to be 0.7-0.8A / cm 2 , the cathode current density is 4~5A / cm 2 , the voltage is 12-15V, the current is 1400-1600A, and the temperature is 800-850°C. After 2 hours of electrolysis, 3kg of lanthanum-cerium-magnesium master alloy with RE content of 40-60% is obtained in the alloy susceptor.

[0023] After analyzing the alloy, La: 40%; Ce: 55%; Pr is less than 0.5%; Nd is less than 0.01%. The content of impurities is low, among which Fe%<0.05%, Cu<0.01%, Ni<0.01%, Si<0.02%; the rest is magnesium.

[0024] The electric efficiency reaches 70-72%, the direct recovery rate of rare earth is 90%, and the direct recovery rate of magnesium is 95%.

Embodiment 3

[0026] Weigh 55g KCl, 2g anhydrous MgCl respectively 2 Mix rare earth chloride with 43g of lanthanum cerium containing 1 to 2 crystal waters to form an electrolyte system after mixing.

[0027] Using the co-electrodeposition method, the anode current density of the electrolysis process is controlled to be 0.8-0.9A / cm 2 , the cathode current density is 5~6A / cm 2 , the voltage is 15-18V, the current is 1600-1800A, and the temperature is 850-950°C. After 2 hours of electrolysis, 3.5kg of lanthanum-cerium-magnesium master alloy with RE content of 60-90% is obtained in the alloy susceptor.

[0028] After analyzing the alloy, La: 40%; Ce: 55%; Pr is less than 0.5%; Nd is less than 0.01%. The content of impurities in the alloy is low, among which Fe%<0.05%, Cu<0.01%, Ni<0.01%, Si<0.02%, and the rest is magnesium.

[0029] The electric efficiency reaches 65-70%, the direct recovery rate of rare earth is 92%, and the direct recovery rate of magnesium is 95%.

[0030] From the resul...

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Abstract

The invention discloses a lanthanum cerium-magnesium intermediate alloy and a production method thereof, relating to the technical field of preparation of a rare earth-magnesium intermediate alloy product. According to the production method, a coelectrodeposition method is adopted, a graphite crucible is used as an electrolytic tank and an anode, a molybdenum bar is used as a cathode, a magnesium oxide crucible is used as an alloy supporting device, an electrolyte is formed by mixing KCl, anhydrous MgCl2 and RECl3 together. By adopting the preparation method disclosed by the invention, the lanthanum cerium-magnesium intermediate alloy high in quality and low in cost can be produced through one step by adopting magnesium and rare earth compounds through the coelectrodeposition method. The process indicators of the whole production process are relatively high, wherein the average electric efficiency reaches 65-75% and more than 85% at the maximum, the rare earth direct yield is more than 85%, and the magnesium direct yield is more than 95%. The lanthanum cerium-magnesium intermediate alloy prepared by the invention is lowest in price, and resources can be continuously supplied to promote sustainable development of rare earth-magnesium alloys.

Description

technical field [0001] The invention relates to the technical field of preparation of a rare earth magnesium master alloy product. Background technique [0002] Recognized at home and abroad, rare earths are the most effective and promising alloying elements to improve the comprehensive performance of magnesium alloys. However, many scientists worry that rare earths are too expensive to be used, and they are also worried about the sustainable supply of rare earths. [0003] Over the years, the bottleneck problem in the development of the rare earth industry is the unbalanced production and sales of rare earth elements, namely: praseodymium and neodymium in light rare earths are in short supply and the price is high, about 250,000 yuan per ton of metal, while the production of one ton of metal neodymium or praseodymium costs about 4 tons of lanthanum and cerium residues are produced, and the price of each ton of lanthanum and cerium metal is about 30,000 yuan, resulting in a ...

Claims

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Application Information

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IPC IPC(8): C22C28/00C22C1/03C25C3/36
Inventor 孟健尹飞刘孝娟吕恒林牛晓东鲁化一胡东坡
Owner 扬州宏福铝业有限公司
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