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Common-battery deposition producing method for Mg La Pr Ce intermediate alloy

A master alloy and co-electrodeposition technology, which is applied in the field of molten salt electrolytic metallurgy, can solve the problems of poor dispersion of rare earths, high production costs, and difficult collection, and achieve resource-saving, cost-effective, and economical and reasonable effects

Inactive Publication Date: 2006-05-17
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These three methods have their own problems: it is difficult to avoid alloy composition segregation in the mixing method, because the specific gravity and melting point of magnesium and most rare earth metals are very different, and the rare earth cannot be well dispersed in magnesium; the intermittent production cost of magnesium thermal reduction method is high ; The products of the floating liquid cathodic electrolysis method are scattered in the upper, middle and lower parts of the electrolytic cell, which is not easy to collect

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] In the electrolysis furnace, a graphite crucible is used as an anode, and a molybdenum rod is used as a cathode. Commercially available industrial potassium chloride, incompletely dehydrated lanthanum, praseodymium, cerium, and rare earth chloride and dehydrated magnesium chloride are added as electrolytes. Magnesium chloride, lanthanum, praseodymium, cerium, rare earth chloride, and potassium chloride are prepared according to the mass ratio of 5:30:65. The electrolysis temperature is 700℃, and the cathode current density is 10A / cm. 2 , The rare earth content is 56.4%, the current efficiency is 73%, and the direct yield of rare earth and magnesium is 92% and 94%.

Embodiment 2

[0010] In the electrolysis furnace, a graphite crucible is used as an anode, and a molybdenum rod is used as a cathode. Commercially available industrial potassium chloride, incompletely dehydrated lanthanum, praseodymium, cerium, and rare earth chloride and dehydrated magnesium chloride are added as electrolytes. Magnesium chloride, lanthanum, praseodymium, cerium, rare earth chloride, and potassium chloride are prepared according to the mass ratio of 5:40:55. The electrolysis temperature is 800℃, and the cathode current density is 20A / cm. 2 , The rare earth content is 24%, the current efficiency is 60%, and the direct yield of rare earth and magnesium reaches 92% and 95% under the condition that the distance between the electrodes is 4cm.

Embodiment 3

[0012] In the electrolysis furnace, a graphite crucible is used as an anode, and a molybdenum rod is used as a cathode. Commercially available industrial potassium chloride, incompletely dehydrated lanthanum, praseodymium, cerium, and rare earth chloride and dehydrated magnesium chloride are added as electrolytes. Magnesium chloride, lanthanum, praseodymium, cerium, rare earth chloride, and potassium chloride are prepared according to the mass ratio of 5:30:65. The electrolysis temperature is 900℃, and the cathode current density is 30A / cm. 2 , The rare earth content is 65%, the current efficiency is 75%, and the direct yield of rare earth and magnesium reaches 80% and 80% under the condition of the electrode spacing of 8cm.

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Abstract

The present invention belongs to a coelectrodeposition prepartion method of magnesium-lanthanum, praseodymium and cerium intermediate alloy. In the electrolytic furnace said invention uses potassium chloride, magnesium chloride and lanthanum-praseodymium-cerium chloride as electrolyte, its cathodic current density is 10-30 A / sq.cm, and its temperature is 700-900 deg.C, so that said invention can utilize the coelectrodeposition process to prepare the invented magnesium-lanthanum-praseodymium-cerium intermediate alloy.

Description

Technical field [0001] The invention belongs to a co-electrodeposition preparation method of magnesium-lanthanum-praseodymium-cerium master alloy, and belongs to the technical field of molten salt electrolytic metallurgy. Background technique [0002] Magnesium-rare earth master alloy is the basic raw material for the preparation of advanced new corrosion-resistant high-temperature magnesium alloys. There are three main methods for preparing magnesium-rare earth master alloys, one is the doping method, the second is the magnesium thermal reduction method, and the third is the floating liquid cathode electrolysis method. These three methods have their own problems: it is difficult to avoid alloy composition segregation for the doping method, because magnesium and most rare earth metals are very different in specific gravity and melting point, and the rare earth cannot be well dispersed in the magnesium; the magnesium thermal reduction method has a high cost of batch production ; T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/36
Inventor 孟健房大庆张德平王军唐定骧赵连山鲁化一
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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