Preparation method of superfine rhenium powder

A technology of rhenium powder and ammonium rhenate, which is applied in the field of manufacturing metal powder, can solve the problems of great environmental hazards of reduction products, discontinuous process, and high requirements for equipment materials, so as to achieve superior product performance, good fluidity, and lower requirements for equipment materials Effect

Inactive Publication Date: 2010-05-05
CENT SOUTH UNIV +1
View PDF1 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process has the advantages of controllable process and superior product performance, but there are certain problems in the process itself: in the chlorination reduction process, the rhenate needs to be chlorinated first, and then reduced, which not only complicates the operation, but also makes the process Discontinuous, and the equipment material requirements are high, and the reduction products are harmful to the environment

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of superfine rhenium powder
  • Preparation method of superfine rhenium powder
  • Preparation method of superfine rhenium powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] like figure 1 As shown, the reactor 1 is heated by a resistance furnace, and its outer diameter is φ90mm. One end of the volatilizer 2 is provided with a ventilation hole 3 for inserting an oxygen pipe 4, and this hole doubles as an escape hole for volatile products, and an escape hole can also be provided at the other end, or on the cover plate 5 of the volatilizer 2. escape hole.

[0024] Weigh ammonium rhenate and load it into the volatilizer 2, place it in the decomposition zone 6, and insert the oxygen delivery pipe 4 into the vent hole 3 of the volatilizer 2. The carrier gas is introduced through the carrier gas pipe 7, and nitrogen gas is first introduced after charging, and the air in the reactor is exhausted through the through hole 8 and the exhaust hole 11, and then the temperature is raised, and the temperature of the decomposition zone 6 is set at 350-700 °C Set and control; the temperature of reduction zone 9 is set and controlled within the range of 600...

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

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of superfine rhenium powder, taking high-purity ammonium rhenate as a raw material and comprising the following steps: heating the high-purity ammonium rhenate at an oxidizing atmosphere to decompose into high valence rhenium oxide Re2O7; and then reducing Re2O7 by H2 or CO to obtain superfine rhenium powder. The superfine rhenium powder obtained by the method of the invention has the advantages of low impurity content, sphere or sphere-like structure, even particle size distribution, high crystallinity, low oxygen content, good fluidity, high tap density and the like.

Description

technical field [0001] The invention relates to a method for producing metal powder by using a gas reducing agent. technical background [0002] Rhenium is a rare refractory metal with many excellent properties. Rhenium and its alloys are widely used in national defense, aerospace and electronics industries, and petrochemical industries. There are many methods for preparing metal rhenium powder. Chinese patent CN1396027 provides a method for preparing high-purity rhenium powder. Stir continuously, filter and dry to make ammonium rhenate powder, and reduce it in hydrogen at 400-600°C to high-purity rhenium powder. This method has the advantages of low reduction temperature and low impurity content, etc., but because the traditional gas-solid reaction method is still used for reduction, the controllability of the production process is not strong. In addition, the powder shape is irregular, and the particles are generally coarse. Wide range of particle size distribution, poor...

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): B22F9/28
Inventor 白猛刘志宏周乐君李启厚刘智勇张传福
Owner CENT SOUTH UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap