The Determination, by X-ray-fluorescence Spectrometry, of Noble and Base Metals in Matte-leach Residues PDF Download
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Author: C. E. Austen
Publisher:
ISBN: 9780869993910
Category :
Languages : en
Pages : 6
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Author: C. E. Austen
Publisher:
ISBN: 9780869993910
Category :
Languages : en
Pages : 6
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Category : Power resources
Languages : en
Pages : 912
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Category :
Languages : en
Pages :
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During the upgrading of platinum ores and the refining of concentrates, analytical information is required on ores, ore concentrates, mattes, matte-leach residues, solutions resulting from the leaching process, and the refined metals. In this field the National Institute for Metallurgy has played a prominent role and has evolved accurate procedures using gravimetric, spectrophotometric, and atomic-absorption methods for the measurement of the noble metals after they have been separated by fire-assay or wet-chemical techniques or both. However, these methods are either lengthy or do not always give adequate precision for the higher concentrations. The X-ray-fluorescence method has potential for speeding up the analysis of some of these materials and for providing greater precision, particularly in the higher-concentration ranges. For matte-leach residues accurate, rapid results are required and it is in this field that the X-ray fluorescence method is shown to be of particular value. A further field in which X-ray fluorescence could be valuable is in the analysis of matte-leach solutions which contain very small amounts of noble metals and high concentrations of base metals. No technique appears to be of direct application to these materials, but the noble metals can be adsorbed on ion-exchange resin and then rapidly determined by X-ray fluorescence techniques. Molybdenum was investigated as an internal standard for palladium, rhodium and ruthenium but was found to be unsatisfactory for the former two elements because the molybdenum Ka absorption edge at 0,620 A lies between the molybdenum Ka1 line at 0,711 A and the palladium and rhodium Ka1 lines at 0,614 and 0,587 A respectively. The background intensity measurement was, however, successfully used for matrix corrections. It was felt that the most satisfactory matrix corrections would be obtained by the use of suitable internal standards and the technique described here used cadmium and mercury. The collection of the noble metals in nickel sulphide by the fire-assay procedure and the analysis of the pressed powder permit the determination by X-ray fluorescence of most of the noble metals in flotation concentrates and nickel sulphide mattes. However, for ores, the noble-metal content is too low for this method to be successful. Although ion-exchange resins can be used to adsorb the noble metals from solutions and can then by analysed by X-ray fluorescence, the lower limit of detection for platinum and palladium adsorbed onto 1g of resin is 53 and 15 ppm respectively. X-ray fluorescence provides an accurate and precise method for the determination of the noble metals in matte-leach residues, provided the composition of the samples does not vary widely and that standards similar in composition to the samples can be prepared.
Author: Christel Pohlandt
Publisher:
ISBN: 9780869990698
Category :
Languages : en
Pages : 15
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Category : Power resources
Languages : en
Pages : 676
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Author: R. C. Mallett
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Category :
Languages : en
Pages : 14
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ISBN: 9780869992982
Category : Precious metals
Languages : en
Pages : 12
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Author: C. Pohlandt
Publisher:
ISBN: 9780869993095
Category : Precious metals
Languages : en
Pages : 13
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ISBN:
Category : Metallurgy
Languages : en
Pages : 236
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Author: South African Institute of Mining and Metallurgy
Publisher:
ISBN:
Category : Mineral industries
Languages : en
Pages : 520
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