Separation and enrichment determination method for Ir, Rh, Pt, Pd and Au in secondary resource material

Abstract

The invention discloses a separation and enrichment determination method for Ir, Rh, Pt, Pd and Au in a secondary resource material. The method includes the following steps that 1, samples are dissolved, and after high-temperature firing carbon removal, a Na2O2+NaCO3 mixed fluxing agent is adopted for fusion in a muffle furnace of 750 DEG C; 2, a test solution is oxidized, an appropriate quantity of sodium chlorate solution is added in a dissolving solution, boiling is performed, and Ir in the solution is oxidized so that the valence state can be made stable; the solution is adjusted to be at the appropriate volume, and the volume concentration of hydrochloric acid reaches 50%; 3, tellurium coprecipitation separation is carried out; 4, determination is carried out, an inductively coupled plasma optical emission spectrometry (ICP-AES) is used for determining the content of the Ir, Rh, Pt, Pd and Au in the solution obtained in the third step at the same time. The accurate and fast separation and enrichment determination method is specifically used for the Ir, Rh, Pt, Pd and Au with the content scope being 0.001%-5% in the secondary resource material such as waste and metallurgical middle materials formed in the using process of various precious metal products. The method is also suitable for separation and enrichment determination of Ir, Rh, Pt, Pd and Au single elements in the secondary resource material.

Description

technical field [0001] The invention relates to the field of precious metal analytical chemistry, in particular to a separation and enrichment measurement method for secondary resource materials such as waste materials formed during the use of various precious metal products and intermediate materials formed in metallurgical recovery processes. Background technique [0002] Due to the special physical and chemical properties of precious metals, such as excellent electrical conductivity, catalytic performance, super corrosion resistance and beautiful color, etc., they have been widely used in the electronics industry, petrochemical industry, environmental protection, aerospace and jewelry industries. Applications. Precious metals are expensive due to their relatively small content on the earth. As a scarce resource, many countries have listed it as an important strategic resource. With the continuous development of my country's economy, precious metals have been more and mo...

AI Technical Summary

Problems solved by technology

[0004] (1) Sample dissolution problem: Due to the strong corrosion resistance of precious metals, it is difficult to dissolve them completely with general acid and alkali, especially materials containing iridium, rhodium, and ruthenium

[0005] (2) Separation and enrichment problem: acid dissolution cannot be completely dissolved, while alkali fusion can be completely dissolved, but a large amount of salt interference must be eliminated by separation

[0006] (3) Selection of measurement means: There are many means for the determination of precious metals, but most of them have certain limitations

[0009] Therefore, considering various factors, to solve the measurement problem of noble metal content in secondary resource materials containing rhodium, iridium and ruthenium, we can only choose alkali fusion to become a solution, and then take other separation and enrichment methods to mix iridium, rhodium, platinum, Accurate determination is possible only when palladium and gold are separated from complex matrix components and salts at the same time

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