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Method for recovering scandia and zirconia from scandia stable zirconia sintered body

A technology for stabilizing zirconia and a recovery method is applied in the field of recovery of scandium oxide and zirconia in a scandium oxide-stabilized zirconia sintered body, and can solve the problem that the mixed regeneration of zirconia sintered powder and unsintered powder and the zirconia sintered electrolyte sheet cannot be satisfied. Aging failure and other issues

Active Publication Date: 2014-02-05
HUBEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] With the industrialization of SOFC, there will be a larger amount of scandia-stabilized zirconia sintered electrolyte sheets aging and failing, and the above-mentioned technology will not be able to meet the mixed regeneration of 2% to 40% mass of zirconia sintered powder and unsintered powder

Method used

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  • Method for recovering scandia and zirconia from scandia stable zirconia sintered body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Using scandia-stabilized zirconia electrolyte sheets that have been detected to be aged in solid oxide fuel cells as raw materials, firstly through simple separation of electrolyte sheets and electrode materials; and then recycling according to the technology described in the present invention;

[0059] Grinding of Scandium Oxide Stabilized Zirconia Waste Porcelain Chips

[0060] A certain weight of the above-mentioned waste porcelain pieces is dry-pulverized in a rotary pulverizer at a rotational speed of 2800rpm, unloaded after continuous rotary pulverization for 45 minutes, and the pulverized powder and zirconia balls of 10mmΦ are simultaneously put into a 50L ball mill to Dry ball milling at 45 rpm for 2 hours, and then sieve through a coarse sieve with a pore size of 3 mm to separate zirconium balls and crushed powder to obtain dry coarsely crushed powder with an average particle size of about 1000 m measured by laser scattering method.

[0061] Mix the above coars...

Embodiment 2

[0075] Different from Example 1, the pulverization of scandium oxide stabilized zirconia sintered body

[0076] A ball mill is used to complete two dry grindings. For the first grinding, the waste porcelain pieces are mixed with 10mmΦ zirconia balls at a ratio of 1:4, and ground at a rotation speed of 80rpm for 3 hours. After sieving and sorting the zirconia balls, the first grinding The powder is then mixed with 5mmΦ zirconia balls and ground at a rotational speed of 66rpm for 5hr to obtain a dry pulverized powder with an average particle size of about 100m-1000m measured by laser scattering method.

[0077] Dissolution leaching of powders of scandia-stabilized zirconia sintered bodies, and Zr 4+ 、Sc 3+ The precipitation recovery step all can be identical with embodiment 1 or close.

Embodiment 3

[0079] Different from Examples 1 and 2, the dissolution and leaching of scandium oxide stabilized zirconia sintered body powder

[0080] The same method as in Example 1 or 2 was used to obtain the pulverized powder of scandium oxide-stabilized zirconia sintered body.

[0081] Mix 12% hydrochloric acid, 5.5kg lithium tetraborate and 75% sulfuric acid, then add 13% volume of sulfuric acid-ammonium sulfate buffer solution and stir evenly to prepare a mixed acid solution with a total volume of 100L, and add it to a 200L reactor Warm up to 230°C, gradually add 25kg of above-mentioned crushed scandium oxide-stabilized zirconia powder under slow stirring, continue stirring and heating for 3.5 hours, a melt with a certain viscosity is formed in the kettle, stop heating at this time, continue stirring and cooling to Below 80°C.

[0082] After cooling down the temperature of the above melt, release it slowly and dilute it with dilute hydrochloric acid. Add about 1000L to 2000L of dilu...

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Abstract

The invention discloses a method for recovering scandia and zirconia from a scandia stable zirconia sintered body. The scandia stable zirconia sintered body comprises at least one of defective, damaged and aged scandia stable zirconia waste ceramic chips. The method is characterized by comprising the following steps: 1. sequentially pulverizing the scandia stable zirconia waste ceramic chip with coarse crushing equipment and fine grinding equipment until the average particle size is greater than 10m and less than or equal to 100m; 2. mixing the pulverized scandia stable zirconia waste ceramic chip ceramic powder and a dissolving system in a ratio of 1:(3-10), and melting; 3. leaching and dissolving the mixed melt in a dilute hydrochloric acid solution; 4. recovering a Zr<4+> ion precipitate in the leach solution by a complexing precipitation process, filtering, washing, and burning to obtain a corresponding zirconium compound; and 5. recovering Sc<3+> ions, collecting the filtrate and washing solution in the step 4, and enriching and purifying by an ammonia water, oxalic acid or tartrate repeated precipitation process to obtain pure scandia.

Description

technical field [0001] The invention relates to the recycling of defective, damaged or aged solid electrolyte tiles in the field of recovery of solid oxide fuel cells, in particular to the dissolution and leaching of scandium oxide-stabilized zirconia sintered bodies of waste tiles, and Zr 4+ and Sc 3+ The method of precipitation separation and extraction. Background technique [0002] Solid oxide fuel cell (Solid Oxide Fuel Cell, referred to as SOFC), as a new type of energy-saving green energy, has attracted the attention of researchers all over the world. It involves from household electricity to commercial power generation, and even automobile power generation. Among them, the solid oxide fuel cell, as a fuel cell with good efficiency and excellent long-term stability, has been widely researched and applied. [0003] As a solid oxide fuel cell, in view of the electrical conductivity and strength of the electrolyte material, a fully stabilized zirconia sintered sheet is...

Claims

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Application Information

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IPC IPC(8): C01G25/02C01F17/00
Inventor 刘琪
Owner HUBEI UNIV OF TECH