Determination method of scattered precious trace metal rhenium in molybdenite concentrate

Abstract

The invention relates to a method for determining rare and dispersed precious trace metal rhenium in molybdenite concentrate, which specifically comprises the following steps: dissolving a sample in a nitric acid-hydrogen peroxide strong oxidation system, oxidizing rhenium to form faint yellow stable Re2O7, forming MoO3 precipitate by Mo, dissolving Re2O7 in water to generate soluble and stable perrhenic acid, not dissolving MoO3 precipitate in water, separating Mo from Re by filtering, and determining the content of rhenium in the molybdenite concentrate. And eliminating matrix interference of molybdenum, determining the filtrate by adopting an ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry) method, and calculating the content of rhenium. The simple, convenient, accurate and rapid method for measuring the rare and dispersed precious rhenium element in the molybdenite concentrate is established, the accuracy of measuring the trace rhenium element is improved, the defect problem of measuring the content of the rare and trace rhenium element in the molybdenite concentrate in the prior art is overcome, particularly, the dependence of rhenium measurement on organic reagents such as tetraphenylarsonic chloride hydrochloride is broken through, and the method is suitable for large-scale popularization and application. The method is particularly suitable for rapid and accurate determination of trace rhenium elements, and the accuracy of a detection result is improved.

Description

technical field [0001] The invention relates to the technical field of element determination, in particular to a method for determining the rare and precious trace metal rhenium in molybdenite concentrate. Background technique [0002] Rhenium is a truly rare element, it is present in the Earth's crust in smaller amounts than all rare earth elements, about 10 -9 order of magnitude, and rarely formed by independent minerals, usually associated with other metals, dispersed in various sulfide minerals and ultrabasic rock minerals, mainly distributed in pegmatite granite and gas-forming deposits, often in nature with oxides, sulfides form exists. Both tetravalent rhenium and molybdenum ion radius are 0.068nm, so most of rhenium occurs in the ore lattice rich in molybdenum, and the content in molybdenite and copper sulfide is relatively high, about 10 -4 ~10 -7 Magnitude. Due to the lack of resources and high price of rhenium, there has been little research on it for a long t...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to make up for the deficiencies in the prior art, and propose a method for the determination of scattered precious trace metal rhenium in molybdenite concentrate, which can effectively solve the following three problems: one of the problems is that the sample is deoiled and moisture It is easy to cause losses. In addition, the iron crucible is severely corroded in the alkali fusion process, and the interference of iron is introduced, which causes the loss of the iron crucible; the second problem is that the sample needs to be extracted by adding organic reagents such as tetraphenylarsine chloride hydrochloride and chloroform Separation from molybdenum; the third problem is the restriction of the extraction and separation operation steps on the determination of rhenium element. The existing technology cannot accurately measure rhenium with low content, especially less than 10ppm