Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Preparation method of high-purity tungsten powder

A high-purity, tungsten powder technology, applied in the field of preparation of high-purity tungsten powder, can solve the problems of small reduction furnace, high cost and long process of quartz furnace tube, so as to save the calcination step, increase the output and reduce the introduction volume effect

Inactive Publication Date: 2020-06-16
XIAMEN HONGLU TUNGSTEN MOLYBDENUM IND CO LTD
View PDF11 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US4762695 discloses tungsten powder or tungsten oxide powder using H 2 o 2 Decompose, and then use ion exchange process to purify, obtain ammonium tungstate after evaporation and crystallization, and obtain high-purity tungsten powder after hydrogen reduction. This method is costly and difficult to produce in batches
CN10125938A discloses a method of chemical cleaning combined with hydrothermal reaction to prepare high-purity tungsten powder. Firstly, a tungstate solution is prepared, the solution is pressurized at 20-40MPa, and after hydrothermal reaction at 120-200°C, it is cleaned and dried with deionized water The precursor is obtained, and the precursor is reduced to obtain high-purity tungsten powder; this method has a complicated process route and is not suitable for mass production
CN103302299A discloses the method of "ammonia dissolution-recrystallization method" to prepare high-purity tungsten powder. Ammonium paratungstate is used as raw material, and tungsten oxide is obtained after calcining; ammonia dissolution, filtration, recrystallization and drying are carried out to obtain ammonium metatungstate; Hydrogen reduction in the quartz furnace tube produces high-purity tungsten powder; this scheme has a long process, the output of ammonium metatungstate is small and unstable, and the reduction furnace of the quartz furnace tube is too small to carry out mass industrial production

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 high-purity tungsten powder
  • Preparation method of high-purity tungsten powder
  • Preparation method of high-purity tungsten powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method of high-purity tungsten powder, comprising the steps of:

[0033] (1) Dissolving 1000kg of commercial grade 0 ammonium paratungstate ammonium paratungstate at 70-90°C in a 10wt% ammonia solution (the dissolution time is 4-8h, and the dissolved tungstic acid concentration is 300g / L), and Filter to remove the alkaline insoluble residues of iron, calcium and other elements to obtain ammonium tungstate solution with pH=9-11;

[0034] (2) Evaporate and crystallize the ammonium tungstate solution obtained in step (1) in the reaction kettle under the conditions that the internal pressure is lower than one atmospheric pressure, pH=7-8 and temperature is 95-105°C, and the tungsten in the mother liquor to be crystallized When the acid concentration reached 20g / L, the crystallization was stopped, and the crystallization rate at this moment reached 92%, and the material containing the mother liquor of crystallization was obtained;

[0035] (3) Filter the mater...

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
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
concentrationaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of high-purity tungsten powder. The high-purity tungsten powder preparation process is short, industrialized batch production can be achieved, and the costis low. Commercial ammonium paratungstate is selected as raw materials and directly subjected to ammonia solution filtering, an ammonium tungstate solution is prepared, after crystallizing, filtering, washing and drying are conducted, ammonium paratungstate is prepared again, then hydrogen gas reduction is conducted in a reduction furnace of a metal furnace tube, and the high-purity tungsten powder is prepared. According to the preparation method of the high-purity tungsten powder, the ammonium paratungstate calcining step is omitted, and the introduced quantities of impurities in the calcining process can be decreased; and general technicians in the field can know that commercial common tungsten powder is obtained through hydrogen gas reduction by taking ammonium paratungstate as the rawmaterials, in the preparation method, a recrystallized product is still ammonium paratungstate, and the high-purity tungsten powder can be conveniently prepared by adopting a common tungsten powder reduction technology.

Description

technical field [0001] The invention belongs to the technical field of tungsten powder preparation, and in particular relates to a preparation method of high-purity tungsten powder. Background technique [0002] In the semiconductor industry, a variety of high-purity metal targets are required, with a purity of more than 99.999%. Among them, high-purity copper targets, high-purity aluminum targets, high-purity titanium targets, and high-purity tantalum targets are used in large quantities. target etc. In comparison, high-purity tungsten targets, high-purity tungsten-titanium targets and high-purity tungsten-silicon targets are less used, but they are irreplaceable in applications such as memory and chips, and are used as wiring materials and diffusion barriers. [0003] In the semiconductor industry, the purity of high-purity tungsten targets, high-purity tungsten-titanium targets and high-purity tungsten-silicon targets is required to be above 99.999%, which requires the p...

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): B22F9/22
CPCB22F9/22
Inventor 郑艾龙陈俊卿黄志民
Owner XIAMEN HONGLU TUNGSTEN MOLYBDENUM IND CO LTD
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
Eureka Blog
Learn More
PatSnap group products