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Method for extracting noble metal iridium from mixed oxide containing ruthenium, iridium, titanium, tin, zirconium and palladium

A mixed oxide and precious metal technology, applied in the direction of improving process efficiency, can solve the problems of low output and high price, and achieve the effect of saving energy

Inactive Publication Date: 2009-06-03
BLUESTAR BEIJING CHEM MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Platinum, palladium, ruthenium, and iridium are all precious metals, especially iridium is a rare precious metal, and the output in my country is very small. Most of the iridium used for metal electrode coating and plating is imported from abroad, and the price is expensive

Method used

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  • Method for extracting noble metal iridium from mixed oxide containing ruthenium, iridium, titanium, tin, zirconium and palladium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take an electrode 1m containing mixed oxide coatings such as ruthenium, iridium, titanium, zirconium, and tin 2 , which contained iridium 1.1g after testing.

[0036] 1 square meter of the above iridium-containing coating was placed in KOH and KNO in a weight ratio of 1:3 3 Dissolve in mixed molten salt, the dissolution temperature is 400°C, then cool the molten salt, soak in water, filter and separate; heat the filtered filter residue to 90°C with aqua regia to melt, so that IrO 2 Generate dark red soluble H 2 IrCl 6 .

[0037] Then after dilution and filtration, the filtrate is retained, the filter residue is dried, collected in a magnetic crucible and melted with hydrogen peroxide, the melting temperature is 650°C, and melted for 1 hour. After cooling, it is immersed in water and then heated with aqua regia at 60-70°C to dissolve and filter. The filtrate was combined with the previously retained filtrate, and the filter residue was discarded. The combined filtra...

Embodiment 2

[0043] Take the mixed oxide coated electrode containing noble metal iridium 1m 2 , It contains 0.98g of iridium after detection.

[0044] 1 square meter of the above iridium-containing coating was placed in KOH and KNO in a weight ratio of 1:2 3 Dissolve in mixed molten salt, the dissolution temperature is 350°C, then cool the molten salt, soak in water, filter and separate; heat the filtered filter residue with aqua regia to 95°C to melt, so that IrO 2 Generate dark red soluble H 2 IrCl 6 .

[0045] Then after dilution and filtration, the filtrate is retained, the filter residue is dried, collected in a magnetic crucible and melted with hydrogen peroxide, the melting temperature is 655°C, and melted for 0.5 hours. After cooling, it is immersed in water and then heated with aqua regia at 60-70°C to dissolve and filter. The filtrate was combined with the previously retained filtrate, and the filter residue was discarded. The combined filtrates now contained chloroiridic ac...

Embodiment 3

[0051] Take the mixed oxide coated electrode containing noble metal iridium 1m 2 , It contains iridium 1.05g after detection.

[0052] Dissolve 1 square meter of the above-mentioned iridium-containing coating in KOH and KNO3 molten salt at a temperature of 430°C, then cool the molten salt, soak it in water, filter and separate it; heat the filtered filter residue to 85°C with aqua regia °C melts, making IrO 2 Generate dark red soluble H 2 IrCl 6 .

[0053] Then after dilution and filtration, the filtrate is retained, the filter residue is dried, collected in a magnetic crucible and melted with hydrogen peroxide, the melting temperature is 645°C, and melted for 1.5 hours. After cooling, it is immersed in water and then heated with aqua regia at 60-70°C to dissolve and filter. The filtrate was combined with the previously retained filtrate, and the filter residue was discarded. The combined filtrates now contained chloroiridic acid and other mixtures, and Na 2 S precipitat...

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Abstract

The method discloses a method for extracting noble metal iridium from a mixed oxide containing ruthenium, iridium, titanium, tin, zirconium and palladium. The method comprises the following steps: firstly, placing a mixed oxide containing noble metal ruthenium in a KOH and KNO3 mixed molten salt for dissolving; cooling the molten salt, immersing and dissolving the molten salt in water, and filtering and separating the solution; thirdly, adding aqua fortis in filter residue, carrying out heating for dissolving, generating chloro-iridic acid H2IrCl6 from the reaction, and carrying out filtration; fourthly, adding ammonium chloride into the filtrate obtained in the third step, leading in chlorine, generating sediment (NH4)2IrCl6, and carrying out filtration; fifthly, adding hydrazine hydrate into the sediment obtained in the fourth step, carrying out heating for dissolving, reducing the (NH4)2IrCl6 into (NH4)3IrCl6; sixthly, adding ammonium chloride into the filtrate obtained in the fifth step, leading in chlorine, generating sediment (NH4)2IrCl6, and carrying out filtration; and seventhly, adding aqua fortis in the sediment obtained in the sixth step, heating the mixture till boiling, and generating H(NH4)2IrCl6. The method can separate and extract the noble metal iridium from a waste electrode coating and a waste electrode cladding, and the recovery rate can be above 50 percent.

Description

technical field [0001] The invention relates to a method for extracting noble metal iridium, in particular to a method for extracting noble metal iridium from mixed oxides containing ruthenium, iridium, titanium, tin, zirconium and palladium. Background technique [0002] At present, there are many technologies and applied technologies for extracting precious metal iridium from simple substances. The technology and application method of extracting precious metal iridium from the metal mixture coating are rare. In order to meet the different electrolysis requirements in different fields, most of the metal electrodes manufactured are titanium and nickel substrates containing oxide coatings of rare and precious metals such as ruthenium, iridium, titanium, tin, zirconium, antimony, palladium, or coatings containing the above mixtures. The active components of the coating and plating in the metal electrode are mainly ruthenium dioxide and iridium dioxide, and some active compone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B5/04C22B3/04C22B3/46C22B3/22
CPCY02P10/20
Inventor 景慧英王文长李岩郑旭周树柏
Owner BLUESTAR BEIJING CHEM MACHINERY
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