Method for preparing high-purity rhenium(VII) oxide through gas reduction

Abstract

The invention discloses a method for preparing high-purity rhenium(VII) oxide by gas reduction, which comprises the following steps: reducing crude ammonium rhenate into a low-valence rhenium compoundin a reducing gas atmosphere at high temperature, and oxidizing the low-valence rhenium compound in an oxygen atmosphere to obtain the high-valence rhenium oxide rhenium heptaoxide easy to sublimate.The method for preparing the high-purity rhenium(VII) oxide is short in process, high in reaction yield and high in product purity. Through detection, the purity of the high-purity rhenium(VII) oxideproduct prepared by the method is greater than 99.999%, and the rhenium recovery rate is greater than 98.5%.

Description

technical field

[0001] The invention specifically relates to a method for preparing high-purity rhenium heptoxide, in particular to a method for preparing high-purity rhenium heptoxide through gas reduction, and belongs to the technical field of chemical synthesis. Background technique

[0002] Rhenium is a kind of scattered metal without independent ore source, which is associated with molybdenite and bornite. Metal rhenium has the characteristics of high melting point, high hardness, creep resistance, corrosion resistance, good plasticity and mechanical stability. In recent years, it has been widely used in high-temperature resistant alloys for aero-engines, high-temperature coatings and petroleum reforming catalysts, etc. field. At present, 80% of the supply of rhenium comes from the extraction of roasting soot collected from the mining of rhenium-containing minerals, and 20% comes from the recycling of secondary resources. In order to obtain better performance of aero-...