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

A mixed oxide and mixed 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
CHINA NAT BLUESTAR GRP CO LTD +1
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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 ruthenium is a rare precious metal, and the output in my country is very small. Most of the ruthenium used for metal electrode coating and plating is imported from abroad, and the price is expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Recovery of metal anode ruthenium by old diaphragm method

[0025] The old anode was coated with titanium-based ruthenium-titanium-tin oxide to analyze and detect the residual amount of precious metals. Using the non-destructive testing method of X-ray fluorescence detector, the residual amount of ruthenium was measured to be 2.3g / m 2 .

[0026] 1 square meter of the above ruthenium-containing coating was placed in KOH and KNO at a weight ratio of 1:3 3 Dissolve in the molten salt mixture, the dissolution temperature is 400°C, then cool the molten salt, soak in water, filter and separate; add the filtrate to the reaction flask, add sodium hypochlorite containing 10% chlorine to the reaction flask, and the reaction temperature is 60°C , add 40% sulfuric acid after reacting for 5 minutes, the reaction generates ruthenium tetroxide gas, add sodium hypochlorite solution again after adding sodium hypochlorite for 10 minutes for the first time, repeat this step unt...

Embodiment 2

[0028] Embodiment 2 The recovery of old ionic membrane method electrode ruthenium

[0029] The oxide coating of the old anode coating mainly composed of ruthenium, titanium, iridium, zirconium and palladium was analyzed and detected for the residual amount of precious metals, and the residual amount of ruthenium was measured to be 3g / m2 by using the non-destructive testing method of X-ray fluorescence detector. 2 .

[0030] Putting the scrap containing precious metal ruthenium into KOH and KNO at a weight ratio of 1:2 3 Dissolve in the molten salt mixture, the dissolution temperature is 350°C, then cool the molten salt, soak in water, filter and separate; add the filtrate to the reaction flask, add sodium hypochlorite containing 12% chlorine to the reaction flask, and the reaction temperature is 50°C , add 50% sulfuric acid after reacting for 3 minutes, the reaction generates ruthenium tetroxide gas, add sodium hypochlorite solution again after adding sodium hypochlorite for ...

Embodiment 3

[0032] The recovery of the anode ruthenium of embodiment 3 chlorate electrolyzer

[0033] The anode coating containing ruthenium precious metal was analyzed and detected for the residual amount of precious metal, and the residual amount of ruthenium was measured to be 2.53g / m by using the non-destructive testing method of X-ray fluorescence detector. 2 .

[0034] Putting the scrap containing precious metal ruthenium into KOH and KNO at a weight ratio of 1:4 3 Dissolve in the molten salt mixture, the dissolution temperature is 430°C, then cool the molten salt, soak in water, filter and separate; add the filtrate to the reaction flask, add sodium hypochlorite containing 8% chlorine to the reaction flask, and the reaction temperature is 80°C , add 60% sulfuric acid after reacting for 8 minutes, the reaction generates ruthenium tetroxide gas, add sodium hypochlorite solution again after adding sodium hypochlorite for the first time for 15 minutes, repeat this step until the end o...

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Abstract

The method discloses a method for extracting noble metal ruthenium from a mixed oxide containing ruthenium, iridium, titanium, tin, zirconium and palladium. The method comprises the following steps: firstly, placing a mixed metal oxide containing noble metal ruthenium in a KOH and KNO3 mixed molten salt for dissolving; secondly, cooling the molten salt, immersing and dissolving the molten salt in water, and filtering and separating the solution; thirdly, adding the filtrate into a reaction bottle, adding sodium hypochlorite and sulfuric acid in the reaction bottle, and generating ruthenium tetroxide gas from the reaction; and fourthly, leading the ruthenium tetroxide gas into an absorption device, adding hydrochloric acid in the absorption device, and generating ruthenium trichloride from the reaction. The method can separate and extract the noble metal ruthenium from a waste electrode coating and a waste electrode cladding and achieving the aim of conserving and reutilizing energy; and the method is also applicable to ruthenium extraction in ruthenium catalyst in the pharmaceutical industry.

Description

technical field [0001] The invention relates to a method for extracting noble metal ruthenium, in particular to a method for extracting noble metal ruthenium 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 ruthenium from simple substances, but it is separated from metal electrodes including anode, cathode coating and plating mixed oxides containing ruthenium, iridium, titanium, tin, zirconium, antimony and palladium. There are few ways to extract the precious metal ruthenium. 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 com...

Claims

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Application Information

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IPC IPC(8): C22B5/04C22B3/04C22B3/46C22B3/22
CPCY02P10/20
Inventor 景慧英王文长樊继红刘海艳张π
Owner CHINA NAT BLUESTAR GRP CO LTD
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