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

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...

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