Method for determining precious metal in platinum-palladium ores

Abstract

The invention discloses a method for determining precious metal in platinum-group metal ores. The method comprises the following steps: (1) obtaining a nickel-sulfonium button from a nickel-sulfonium fire assay enriching sample; (2) grinding the nickel-sulfonium button with a grinder; (3) adding the ground nickel-sulfonium button in a hydrochloric acid solution and heating for dissolving to remove base metal and sulfonium from the nickel-sulfonium button; (4) adding a reductant and a coprecipitator to the solution obtained from the step (3) to recover a small quantity of precious metal lost in the solution; (5) performing suction filtration at negative pressure to obtain a precious metal precipitate; (6) dissolving the precipitate in the step (5) together with a filtering membrane with aqua regia in a water bath and diluting with pure water to a fixed volume; (7) drawing calibration curves of platinum, palladium, gold, rhodium, ruthenium and iridium by an ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometer) and determining the intensity of spectral lines of platinum, palladium, gold, rhodium, ruthenium and iridium in the sample solution; (8) automatically calculating the content of to-be-detected elements by a computer according to the calibration curves and a sample information table. The method has good stability and high result accuracy degree. According to the method, six precious metal elements can be determined simultaneously just by one-time sample weighing and pretreatment, the working efficiency is increased greatly and the detection cost is lowered.

Description

technical field [0001] The invention belongs to the field of chemistry, and is a method applicable to the determination of precious metals in platinum group metal ores, in particular a method for the simultaneous determination of Pt, Pd, Au, Rh, Ru and Ir by nickel matte assay gold enrichment ICP-OES. Background technique [0002] The content of platinum group metals in geological and ore samples of the Big Dyke platinum-palladium mining area in Zimbabwe (hereinafter referred to as Big Dyke) is usually relatively high, generally at the μg / g level. Such high-content platinum group metal deposits are rare in China. The existing platinum group metal testing methods (including national standards) generally use atomic absorption spectrometry (AAS) or inductively coupled plasma mass spectrometry (ICP-MS). It cannot measure multiple elements at the same time, the process is cumbersome, the efficiency is low, and the stability and accuracy cannot meet the requirements; the latter is...

AI Technical Summary

Problems solved by technology

Such high-content platinum group metal deposits are rare in China. The existing platinum group metal testing methods (including national standards) generally use atomic absorption spectrometry (AAS) or inductively coupled plasma mass spectrometry (ICP-MS). It cannot measure multiple elements at the same time, the process is cumbersome, the efficiency is low, and the stability and accuracy cannot meet the requirements; the latter is not suitable for the determination of platinum group metals at the μg / g level

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