Method for preparing Ho-Fe alloy through molten salt electrolysis

A technology of molten salt electrolysis and ferroalloy, which is applied in the field of preparation of holmium-iron alloy by molten salt electrolysis, which can solve the problems of high production cost, low production capacity and high production energy consumption, and achieve reduced energy consumption and production cost, high production capacity and reduced secondary refining the effect of the process

Inactive Publication Date: 2013-04-24
JIANGSU JINSHI RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of vacuum reduction method for production, its production energy consumption is still high, and expensive vacuum reduction equipment and tungsten, molybdenum crucibles, etc. are required, resulting in high production costs and low production capacity.

Method used

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  • Method for preparing Ho-Fe alloy through molten salt electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A 500mm circular graphite electrolytic cell is used, the electrolytic cell is placed in a small steel sleeve, surrounded by graphite powder, the upper part is sealed with refractory cement, and the corundum gasket is installed, and then the small steel sleeve is placed in the steel furnace shell In the middle, the insulation materials, refractory materials and thermal insulation materials are filled around, and the cover plate is installed. The anode is composed of 4 graphite sheets, which specifically includes the following steps:

[0026] (1) First, the electrolytic cell is baked with an arc machine for 8 hours, and the furnace body is dried;

[0027] (2) Then turn on the power of the arcing machine to 45Kw, and continuously add a binary system electrolyte composed of holmium fluoride and lithium fluoride to the furnace. The electrolyte is as follows: the mass fraction of lithium fluoride is 3%, fluoride The mass fraction of holmium is 97%, which is prepared and added...

Embodiment 2

[0036] A 550mm circular graphite electrolytic cell is used, the electrolytic cell is placed in a small steel sleeve, filled with graphite powder, the upper part is sealed with refractory cement, and the corundum gasket is installed, and then the small steel sleeve is placed in the steel furnace shell In the middle, the insulation materials, refractory materials and thermal insulation materials are filled around, and the cover plate is installed. The anode is composed of 4 graphite sheets, which specifically includes the following steps:

[0037] Specifically include the following steps:

[0038] (1) First, use an arc striker or a heating element oven for 12 hours to dry the furnace body;

[0039] (2) Then turn on the power of the arcing machine to 45Kw, and continuously add a binary system electrolyte composed of holmium fluoride and lithium fluoride to the furnace. The electrolyte is as follows: the mass fraction of lithium fluoride is 15%, and the The mass fraction of holmi...

Embodiment 3

[0048] A 600mm circular graphite electrolytic cell is used, and the electrolytic cell is placed in a small steel sleeve, surrounded by graphite powder, sealed with refractory cement, and a corundum gasket is installed, and then the small steel sleeve is placed in the steel furnace shell In the middle, the insulation materials, refractory materials and thermal insulation materials are filled around, and the cover plate is installed. The anode is composed of 4 graphite sheets, which specifically includes the following steps:

[0049] (1) First, use an arc striker or a heating element oven for 24 hours to dry the furnace body;

[0050] (2) Then turn on the power of the arcing machine to 45Kw, and continuously add a binary system electrolyte composed of holmium fluoride and lithium fluoride to the furnace. The electrolyte is as follows: the mass fraction of lithium fluoride is 30%, and the The mass fraction of holmium is 70%, which is prepared and added to the electrolytic cell, a...

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Abstract

The invention discloses a method for preparing Ho-Fe alloy through molten salt electrolysis, wherein a graphite crucible serves as an electrolyzer, a graphite flake serves as an anode, a pure iron rod serves as a cathode, a ferric crucible serves as a metal receiver, and holmium oxide serves as a raw material; and holmium fluoride and lithium fluoride serve as a binary system electrolyte and then are electrolyzed in a certain condition. The method comprises the following steps of: (1) drying the electrolyzer through an arching machine or a heating element oven; (2) switching on the power of the arching machine to 45kW, and continuously adding an electrolyte into the furnace continuously; (3) after the electrolyte is melted to a part which is 10cm far away from the upper edge of the electrolyzer, placing an iron crucible in the center of a furnace bottom, placing the pure iron rod above the iron crucible, and feeding a direct current to start electrolysis; (4) adding a small quantity of holmium oxide repeatedly or continuously and evenly adding holmium oxide during the electrolytic process, and intermittently adjusting the pure iron rod once intermittently; and (5) after the electrolysis is carried out for a period of time, taking out the iron crucible, pouring to obtain an ingot, and demoulding to obtain the Ho-Fe alloy after the cooling. The Ho-Fe alloy obtained by the invention is low in energy consumption, high in capacity and small in deviation, so that the Ho-Fe alloy is convenient for mass production.

Description

technical field [0001] The invention relates to a method for preparing holmium-iron alloy by molten salt electrolysis, and belongs to the field of rare earth alloy preparation. Background technique [0002] There are two main methods for the preparation of holmium-iron alloys: metal pair-doping high temperature mutual dissolution method and fluoride vacuum calcium thermal reduction method. [0003] For the mixed high temperature mutual dissolution method, metal holmium is first produced, and then metal holmium and pure iron are used for high temperature mutual dissolution in a vacuum environment, which has the characteristics of a simple production method. The holmium-iron alloy produced by the counter-doping method has high impurity content, high energy consumption and high production cost, and metal holmium can theoretically be produced by electrolysis, but because its electrolysis temperature is as high as 1461 ℃, this method produces metal holmium The conditions become ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/36
Inventor 刘建国刘木根王志远颜波
Owner JIANGSU JINSHI RARE EARTH CO LTD
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