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Graphite anode anti-oxidation coating for producing rare earth metal

A technology of anti-oxidation coating and graphite anode, which is applied in the field of producing anti-oxidative coating of graphite anode for rare earth metals

Active Publication Date: 2006-04-26
BAOTOU RES INST OF RARE EARTHS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are some graphite anti-oxidation coatings on the market, coating materials that can be directly used to reduce the anodic oxidation rate of graphite in the process of molten salt electrolysis of rare earth metals have not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Fluoride system oxide electrolytic production of praseodymium neodymium metal graphite anode coating material by PrNdF 3 , LiF and white latex are mixed and prepared, and the ratio is PrNdF 3 :LiF=97:3 (weight percent). PrNdF 3 After preparing in proportion with LiF, the PrNdF 3 The mixture after mixing with LiF is according to PrNdF 3 + LiF: white latex = 3:1 (volume percentage) mixed and stirred into a paste, and then coated on the graphite anode. After the graphite anode coated with anti-oxidation coating is dried, compared with the graphite anode without coating, the monthly graphite consumption of each 4KA electrolytic cell can be reduced by 5-10%.

Embodiment 2

[0025] Fluoride system oxide electrolytic production of praseodymium neodymium metal graphite anode coating material by PrNdF 3 and LiF according to PrNdF 3 : LiF=97:10 (weight percent), mixed and prepared, completely melted at 900°C and poured into a cooling ingot mold. After cooling, crush it into a powder smaller than 40 mesh and press PrNdF with white latex 3 + LiF: white latex = 3:1 (volume percentage) mixed and stirred into a paste, and then coated on the graphite anode. After the graphite anode coated with anti-oxidation coating is dried, compared with the graphite anode without coating, the monthly graphite consumption of each 4KA electrolytic cell can be reduced by 5-10%.

Embodiment 3

[0027] Fluoride system oxide electrolytic production of metal neodymium graphite anode coating material made of NdF 3 , LiF and white latex mixed preparation. The ratio is NdF 3 :LiF=97:6 (weight percent). NdF 3 After matching with LiF in proportion, add NdF 3 The mixture with LiF is in accordance with NdF 3 + LiF: white latex = 3:1 (volume percentage) mixed and stirred into a paste, and then coated on the graphite anode. After the graphite anode coated with anti-oxidation coating is dried, the monthly graphite consumption of each 4KA electrolytic cell can be reduced by 5-10% compared with the graphite anode without coating.

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PUM

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Abstract

The present invention relates to antioxidant coating of graphite anode for producing RE metal and its preparation process. The coating consists of mainly the fluoride of the produced RE metal and alloy, RE oxide, fluoride of alkali metal and alkali earth metal, and adhesive. The preparation process includes mixing the said components, high temperature fusion, cooling, crushing into powder, mixing with adhesive, painting the mixture onto the graphite electrode and stoving or air drying. The coating has simple forming process, and may be used to lower the oxidation speed of graphite anode, raise the utilization rate of the graphite anode and lower the RE metal producing cost.

Description

1. Technical field [0001] The invention relates to a graphite anode anti-oxidation coating for producing rare earth metals, belongs to the technical field of rare earth metals produced by molten salt electrolysis, and is used for reducing the oxidation speed of graphite anodes used in the process of producing rare earth metals by molten salt electrolysis. 2. Background technology [0002] Because graphite has excellent electrical and thermal conductivity, acid, alkali, and corrosion resistance, graphite is used as an electrode for the production of rare earth metals by molten salt electrolysis. However, the production process of open molten salt electrolytic cells is carried out in the air, and the electrolysis temperature is generally high. At 700°C, graphite anodes exposed to air will shorten their service life due to oxidation. Increased production costs. [0003] At present, there are two main methods used to reduce the oxidation rate of graphite, namely: impregnation a...

Claims

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Application Information

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IPC IPC(8): C25C3/34
Inventor 张志宏汪进宝侯复生
Owner BAOTOU RES INST OF RARE EARTHS
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