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A method for recovering iridium from iridium-containing organic waste liquid

A technology of organic waste liquid and waste liquid, applied in the field of iridium recovery

Active Publication Date: 2021-04-09
SINO PLATINUM METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a method for reclaiming iridium from iridium-containing organic waste liquid for the problems existing in the existing method for reclaiming iridium from organic waste liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1 Get the reaction waste liquid 5000g (iridium content 0.24%) that produces in the process of preparing 1,5-cyclooctadiene iridium chloride dimer, adjust its pH value to 10, add 5g of tributyl phosphate, and the waste liquid Slowly add it into the reactor containing 50g of solid reducing agent sodium borohydride, stir the reaction fully until no bubbles are generated; After fully washing, filtering, and then drying the iridium precipitate in a tube furnace at 300° C. under a nitrogen stream, 10.82 g of iridium powder was obtained, and the recovery rate of iridium was 90.17%.

Embodiment 2

[0012] Example 2 Get 2000 g of reaction waste liquid (iridium content 0.08%) produced in the process of preparing iridium acetylacetonate dicarbonyl, adjust its pH value to 10, add 1.5 g of tributyl phosphate, and slowly add the waste liquid to a container containing 25 g of solid reduction In a reactor containing potassium borohydride, fully stir the reaction until no bubbles are generated; after the reaction is completed, the iridium precipitate is separated by filtration under reduced pressure, fully washed with absolute ethanol and 80°C deionized water, and filtered, and the obtained After the iridium precipitate was dried in a tube furnace at 300° C. under a nitrogen stream, 1.43 g of iridium powder was obtained, and the recovery rate of iridium was 89.37%.

Embodiment 3

[0013] Example 3 Take 3000 g of the concentrated solution (iridium content 2.19%) from the reaction waste liquid produced in the process of preparing 1,5-cyclooctadiene iridium chloride dimer through vacuum distillation and concentration, adjust its pH value to 7, and add 3 g of tributyl phosphate, the waste liquid is slowly added to the reactor containing 150g of solid reductant sodium borohydride, and the reaction is fully stirred until no bubbles are generated; Fully wash with absolute ethanol and 80°C deionized water, filter, and dry the obtained iridium precipitate in a tube furnace at 300°C under nitrogen flow to obtain 62.00 g of iridium powder, and the recovery rate of iridium is 94.36%.

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PUM

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Abstract

The invention discloses a method for recovering iridium from iridium-containing organic waste liquid, which is characterized in that the pH value of the iridium-containing organic waste liquid is adjusted, a defoaming agent is added therein, and the waste liquid is subjected to a reduction reaction with a solid reducing agent, The iridium compound in the waste liquid is reduced to metallic iridium precipitation, filtered, washed and dried to obtain iridium powder. The invention has simple process, high recovery efficiency, strong adaptability to raw materials, and can process various iridium-containing organic waste liquids.

Description

technical field [0001] The invention relates to a method for recovering iridium, in particular to a method for recovering iridium from iridium-containing organic waste liquid. Background technique [0002] Organic compounds of iridium, such as iridium acetylacetonate, iridium bis(phenylphosphine)carbonyl chloride, iridium acetate, etc., are important precursor compounds for iridium phosphorescent molecular materials, homogeneous catalysts, and metal-organic chemical vapor deposition for OLEDs. . During the preparation and production of iridium organic compounds, due to the low product yield, a considerable part of iridium by-products enters the waste liquid containing a large amount of organic matter. 1,5-cyclooctadiene iridium chloride homogeneous catalyst for the synthesis of fine metolachlor in the fine chemical industry, iridium acetate catalyst for the production of acetic acid by the Cativa process of methanol low-pressure carbonylation [Ir 3 (O 2 CCH 3 ) 6 -μ 3 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B7/00
CPCY02P10/20
Inventor 董海刚赵家春裴洪营崔浩杨海琼吴跃东童伟锋保思敏王亚雄吴晓峰
Owner SINO PLATINUM METALS CO LTD