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Process for producing Mg rare earth intermediate alloy by Submerged Liquid Cathode electrolysis under low-temperature

A rare earth intermediate alloy and liquid cathode technology, applied in the field of molten salt electrolysis metallurgy, can solve problems such as poor collection, discontinuous production, and current efficiency drop, and achieve the effects of high energy utilization rate and uniform composition

Active Publication Date: 2006-05-17
白山市天安金属镁矿业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large difference in specific gravity and melting point of most rare earth metals and metallic magnesium, it is difficult to obtain a master alloy with uniform composition regardless of the mixing method; Both methods belong to discontinuous production; the floating liquid cathodic electrolysis method has product dispersion, which is not easy to collect, and the alloy is dispersed due to the churning of the electrolyte during the electrolysis process, and it is easy to interact with the chlorine gas produced by the anode, resulting in a decrease in current efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] With commercially available chemically pure potassium chloride and sodium chloride, 8~30wt% (LPC)CL after dehydration 3 As a raw material, weigh 10% of LPCCl by weight % 3 50% KCl; 40% NaCl as electrolyte, preheated at 100°C for 3 hours, fully mixed with another raw material magnesium-5wt% lanthanum-praseodymium-cerium master alloy, the ratio of its mass to total electrolyte is 1:4 , put it into a cylindrical open electrolytic crucible with a diameter of 10cm and a height of 16cm, raise the temperature to 700-900°C, and start electrolysis after the added electrolyte melts. Stir properly during the electrolysis process, and leave the furnace for a period of time at the end of the electrolysis to control the furnace temperature at 750°C to produce the magnesium-lanthanum-praseodymium-cerium master alloy. The rare earth content of lanthanum, praseodymium and cerium in the alloy is 18wt%, and the current efficiency reaches 71%.

Embodiment 2

[0015] With commercially available chemically pure potassium chloride and sodium chloride, 8~30wt% (LPC)CL after dehydration 3 As a raw material, weigh 15% of LPCCl by weight % 3 The KCl of 48%; The NaCl of 37% is as electrolyte, through 100 ℃ of preheating 3 hours, fully mix again and another kind of raw material magnesium-6wt% lanthanum praseodymium cerium master alloy, its quality and total electrolyte are 1: 4.5, Put it into a cylindrical open electrolytic crucible with a diameter of 10cm and a height of 16cm, raise the temperature to 700-900°C, and start electrolysis after the added electrolyte melts. Proper stirring during the electrolysis process, and standing for a period of time at the end of the electrolysis so that the temperature of the furnace is controlled at 780°C and the product is released from the furnace to prepare a magnesium-lanthanum-praseodymium-cerium master alloy. The rare earth content of lanthanum, praseodymium and cerium in the alloy is 25 wt%, and...

Embodiment 3

[0017] With commercially available chemically pure potassium chloride and sodium chloride, 8~30wt% (LPC)CL after dehydration 3 As a raw material, weigh 25% of LPCCl by weight % 3 ;: 45% KCl; 30% NaCl as electrolyte, preheated at 200°C for 3 hours, fully mixed with another raw material magnesium-8wt% lanthanum-praseodymium-cerium master alloy, its quality and total electrolyte are 1:5 , put it into a cylindrical open electrolytic crucible with a diameter of 10cm and a height of 16cm, raise the temperature to 700-900°C, and start electrolysis after the added electrolyte melts. Proper stirring during the electrolysis process, and standing for a period of time at the end of the electrolysis to control the temperature of the product out of the furnace at 820°C to prepare the magnesium-lanthanum-praseodymium-cerium master alloy. The rare earth content of lanthanum, praseodymium and cerium in the alloy is 30 wt%, and the current efficiency reaches 73%.

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Abstract

The present invention belongs to a preparation process of magnesium-rare earth intermediate alloy, belonging to the field of fused salt electrolysis metallurgical technology. It is characterized by that it uses the lanthanum-praseodymium-cerium chloride (LPC) cl3 which is residual after neodymium extraction and whose content is 8-30 wt% after it is dehydrated as raw material, its electrolyte system is Kcl (50-40)% : NaCl (42-30) %: (8-30%) of (LPC) Cl3, and its solvent is Kcl and Nacl, and (LPC) Cl3 is solute. Said invention adopts magnesium-lanthanum-praseodymium-cerium intermediate alloy whose rare earth content is 5-8 wt% as initial subsidence liquid cathode, and the mass ratio of said intermediate alloy and total electrolyte is 1:4-5, under the condition of 700-900 deg.C said invention utilizes the electrolysis process to prepare magnesium-(8-30) wt% lanthanum-praseodymium-cerium intermediate alloy with high rare earth content.

Description

technical field [0001] The invention relates to a method for preparing a magnesium-rare-earth master alloy by electrolysis of a low-temperature sinking liquid cathode. The invention belongs to the technical field of molten salt electrolytic metallurgy. Background technique [0002] The invention belongs to the preparation method of magnesium-rare earth master alloy. Magnesium-rare earth master alloy is the basic raw material for preparing advanced magnesium alloys with heat resistance, high temperature creep resistance and corrosion resistance. In the past, there are mainly three methods for preparing magnesium-rare earth master alloys: one is vacuum smelting or the method of mixing under the cover of molten salt, the other is calcithermal reduction method, and the third is floating liquid cathodic electrolysis. Vacuum smelting or molten salt covering requires high equipment and raw materials for blending, high refining temperature, low single furnace output, and molten sa...

Claims

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Application Information

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IPC IPC(8): C25C3/36
Inventor 孟健张德平房大庆王军唐定骧鲁化一赵连山
Owner 白山市天安金属镁矿业有限公司
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