Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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

A rhenium heptaoxide, gas technology, applied in chemical instruments and methods, rhenium compounds, inorganic chemistry and other directions, can solve problems such as affecting the performance of materials, and achieve the effects of short process, high reaction yield and high product purity

Inactive Publication Date: 2020-06-16
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain better performance of aero-engine superalloys, it is necessary to add rhenium and other metals to the alloy materials to enhance the comprehensive performance of aero-engine blades at high temperatures, but the impurity contained in the elemental metal materials that make up the superalloy will seriously affect the use of materials performance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Take 10g of crude ammonium rhenate (the mass percentage of ammonium rhenate is 99%) and place it in a quartz boat, place it horizontally in the center of the quartz tube of the tubular heating furnace, place refractory plugs on both sides of the quartz tube; Replace the air in the quartz tube; the ventilation flow rate is 3000ml / min, and the ventilation time is 30 minutes;

[0017] (2) Heat up to 150 o C, while continuously feeding CO gas, reacted for 2 h; continued to heat up to 350 °C for 5 h, and then naturally cooled to 100 °C.

[0018] (3) Introduce oxygen into the quartz tube cooled to 100°C to replace the CO gas in the tube, the ventilation flow rate is 3000ml / min, and the aeration time is 30 minutes; then raise the temperature to 150°C, and continue to feed oxygen for 2 hours to react, and continue to heat up to React at 350 °C for 1 h, then cool to room temperature naturally. Light yellow rhenium heptoxide is generated in the condenser connected with the ...

Embodiment 2

[0020] (1) Take 10g of crude ammonium rhenate (the mass percentage of ammonium rhenate is 99%) and place it in a quartz boat, place it horizontally in the center of the quartz tube of the tubular heating furnace, place refractory plugs on both sides of the quartz tube, and feed NH 3 Replace the air in the quartz tube; the ventilation flow rate is 3500 ml / min, and the ventilation time is 40 minutes;

[0021] (2) Heat up to 250 o C, while continuously feeding NH 3 , reacted for 1.5 h; continued to heat up to 400 °C for 3 h, then naturally cooled to 100 °C;

[0022] (3) Introduce oxygen into the quartz tube cooled to 100 °C to replace the gas in the tube, the ventilation flow rate is 3500 ml / min, and the ventilation time is 40 min; then the temperature is raised to 150 °C, and the oxygen reaction is continued for 1.5 h at the same time; continue to heat up React at 400°C for 2h, and cool to room temperature naturally. There is light yellow rhenium heptoxide generated in the co...

Embodiment 3

[0024] (1) Take 10g of crude ammonium rhenate (the mass percentage of ammonium rhenate is 99%) and place it in a quartz boat, place it horizontally in the center of the quartz tube of the tubular heating furnace, place refractory plugs on both sides of the quartz tube, and inject NO Replace the air in the quartz tube: the ventilation flow rate is 4000 ml / min, and the ventilation time is 40 minutes;

[0025] (2) Heat up to 150 o C, continue to feed NO gas at the same time, react for 2.5 h; continue to heat up to 450 °C for 4 h, and naturally cool to 100 °C;

[0026] (3) Introduce oxygen into the quartz tube cooled to 100 °C to replace the gas in the tube: the ventilation flow rate is 4000 ml / min, and the ventilation time is 40 min; then the temperature is raised to 200 °C, and the oxygen reaction is continued for 2.5 h at the same time, and the temperature is continued to React at 450°C for 3h, and cool to room temperature naturally. There is light yellow rhenium heptoxide ge...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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-...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01G47/00
CPCC01G47/00C01P2006/80
Inventor 郭勇卢晓锋李亦婧王立成王旭生梁晓静王帅
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com