Abstract
Analysis of platinum group elements (PGE) extracted from various catalysts used in the car, petroleum and chemical industries requires use of microanalytical methods. PGE content in the platinum powder concentrates K176 and K177 was studied by SEM-EDS. The content of main elements was determined using analytical lines Fe Kα1, Si Kα1, Sn Lα1, Pt Lα1, Re Lα1. The obtained data for the chemical composition are in good agreement with the result obtained by X-ray fluorescence analysis and ICP-MS method. Powdered platinum concentrates are considered to be ferrosilicide (FeSi), where PGE are localized at the phase boundaries and in separate patches of the K176 sample, or distributed over the volume of particles in the K177 sample.
Highlights
High cost of platinum group elements (PGE) dictates the economic feasibility of their recovery from various catalysts which had been used in car, petroleum and chemical industries
Semi-quantitative analysis of the PGE content was performed using a standard sample of metallic cobalt with consequent normalization of total elements content to 100%
The lines for the two last of the listed PGEs do not overlapped with X-ray lines for Al, Cr, Ti, V, Ca, Cl, the presence of which is typical for studied samples (Fig. 3); their content was measured by the corresponding X-ray lines Al Kα1, Cr Kα1, Ti Kα1, V Kα1, Ca Kα1, Cl Kα1
Summary
High cost of platinum group elements (PGE) dictates the economic feasibility of their recovery from various catalysts which had been used in car, petroleum and chemical industries. The quantitative electron probe microanalysis of the processed powdered platinum concentrate, in order to determine its composition is difficult due to the rough surface of the particles and the significant overlaps of the X-ray emission lines of PGE. Development of a microanalysis method for the determination of PGE content in the products of catalyst recycling allow to optimize the technology and assess the efficiency of metal extraction. The aim of the work is to develop a microanalysis technique for the determination of PGE content in platinum powder concentrate and in the products of its recycling using scanning electron microscopy (SEM) equipped with an energy dispersive spectrometer (EDS), as well as to test tion of chemical composition and morthe modified technique for the examina- phological characteristics of the samples
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