Phase state analytical method of Pt, Pd, and Au in black rock-type platinoid minerals

Abstract

The invention discloses a phase state analytical method of Pt, Pd, and Au in black rock-type platinoid minerals. The phase state analytical method is carried out in a way of combining the mineral composition of black rock, the enrichment forms of precious metal elements in a mineral of the kind and the properties of the precious metal elements, meanwhile referring to an analytical method of platinum and palladium active states, dividing the occurrence phase states of Pt, Pd and Au in the black rock into four phase states of an exchangeable phase, an organic bond phase, a sulfide bond phase and a residue phase, and inhibiting the adsorption of Pt, Pd, and Au in each phase state by an organic matter and carbon through developing a novel desorption reagent, namely potassium thiocyanate-sodium cyanide. The phase state analytical method comprises the steps of respectively using 5 percent of ammonium citrate tribasic, a sodium pyrophosphate buffer solution and glacial acetic acid-hydrogen peroxide to extract Pt, Pd and Au in the exchangeable phase, the organic bond phase and the sulfide bond phase, and accurately determining the contents of Pt, Pd, and Au the each phase state by ICP-MS, so that a theoretical basis is provided for the comprehensive utilization of the precious metal elements in the black rock and for geological prospection.

Description

technical field [0001] The invention belongs to the technical field of ore deposit analysis, and in particular relates to a method for phase analysis of Pt, Pd and Au in black rock type platinum group minerals. Background technique [0002] At present, the main types and distribution rules of PGE deposits, the basic characteristics of deposit types, and the PGE enrichment law are far from enough, and the classification of PGE deposits has not yet been formed. According to the research results of petrology, mineralogy and geochemistry, the platinum group elements in my country are mainly divided into three types of deposits of magmatic origin, magmatic hydrothermal origin and sedimentary origin. The polymetallic mineralization of black shale in different geological ages has become the focus of geologists, especially the discovery of metal deposits in black shale associated with platinum group elements and high content of organic carbon. According to the research results on t...

AI Technical Summary

Problems solved by technology

Due to the presence of a large amount of carbon and organic matter in black rock, which has a strong adsorption effect on PGE, the leaching agent cannot effectively leach PGE when leaching the exchangeable bonded state.

Using heavy liquid to separate carbon and organic matter, because the carbon particles in minerals are too fine, even if the sample particle size reaches 600 mesh, the carbon and mineral phases cannot be completely separated

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