Method for producing tungsten carbide

Patent metadata

Field	Value
Publication number	US-2018072576-A1
Application number	US-201615563278-A
Country	US
Kind code	A1
Filing date	Mar 28, 2016
Priority date	Mar 31, 2015
Publication date	Mar 15, 2018
Grant date	—

Abstract

Provided is a method for efficiently producing tungsten carbide from a raw material mixture comprising at least one valuable containing tungsten. The present invention relates to a method for producing tungsten carbide, comprising the steps of subjecting a raw material mixture comprising at least one valuable containing tungsten to electrolysis using an organic electrolytic solution to dissolve tungsten in the electrolytic solution; and calcining the electrolytic solution containing dissolved tungsten at a temperature of 800° C. or more to obtain tungsten carbide.

First claim

1 . A method for producing tungsten carbide, comprising the steps of:
subjecting a raw material mixture comprising at least one valuable containing tungsten to electrolysis using an organic electrolytic solution to dissolve tungsten in the electrolytic solution; and calcining the electrolytic solution containing dissolved tungsten at a temperature of 800° C. or more to obtain tungsten carbide.

2 . The method for producing tungsten carbide according to claim 1 , wherein the organic electrolytic solution is an organic alkaline electrolytic solution.

3 . The method for producing tungsten carbide according to claim 2 , wherein the organic alkaline electrolytic solution contains at least one alcohol amine.

4 . The method for producing tungsten carbide according to claim 3 , wherein the at least one alcohol amine is monoethanolamine and/or triethanolamine.

5 . The method for producing tungsten carbide according to claim 3 , wherein a concentration of the alcohol amine in the electrolytic solution is from 1 to 50% by mass.

6 . The method for producing tungsten carbide according to claim 1 , wherein a rate of temperature increase to the calcining temperature in the calcining step is 5° C./min. or more.

7 . The method for producing tungsten carbide according to claim 1 , wherein the raw material mixture contains from 1 to 60% by mass of at least one valuable other than tungsten.

8 . The method for producing tungsten carbide according to claim 7 , wherein the raw material mixture contains from 1 to 30% by mass of at least one valuable other than tungsten.

9 . The method for producing tungsten carbide according to claim 8 , wherein the raw material mixture contains from 3 to 10% by mass of at least one valuable other than tungsten.

10 . The method for producing tungsten carbide according to claim 1 , wherein the electrolysis is carried out by adjusting a temperature of the electrolytic solution to 20 to 80° C.

11 . The method for producing tungsten carbide according to claim 2 , wherein the electrolytic solution has a pH of 7 or more.

12 . The method for producing tungsten carbide according to claim 1 , wherein tungsten is also obtained simultaneously with the tungsten carbide in the step of calcining the electrolytic solution containing dissolved tungsten at the temperature of 800° C. or more to obtain the tungsten carbide.

13 . The method for producing tungsten carbide according to claim 1 , wherein after the step of dissolving tungsten in the electrolytic solution, the electrolytic solution is subjected to preliminary heating to reduce water content, and then carrying out the calcining step to obtain the tungsten carbide.

14 . The method for producing tungsten carbide according to claim 1 , wherein an anode used for the electrolysis is a titanium basket provided with the raw material mixture comprising the at least one valuable containing tungsten.

Assignees

• Jx Nippon Mining & Metals Corp

Inventors

• Kawamura Toshifumi

Classifications

• C25C1/06

  or iron group metals, refractory metals or manganese · CPC title

• C25D1/22

  Separating compounds · CPC title

• C01B32/949 Primary

  Tungsten or molybdenum carbides · CPC title

• C04B35/6264

  Mixing media, e.g. organic solvents · CPC title

• C22B7/00

  Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; {Methods of a general interest or applied to the winning of more than two metals (briquetting of scrap C22B1/248; preliminary treatment of scrap C22B1/005)} · CPC title