Title:
METHOD FOR SEPARATION AND IMPURITY REMOVAL OF TUNGSTEN AND MOLYBDENUM DURING TUNGSTEN SMELTING PROCESS
Document Type and Number:
WIPO Patent Application WO/2023/206841
Kind Code:
A1
Abstract:
The present invention relates to a method for separation and impurity removal of tungsten and molybdenum during a tungsten smelting process. The method comprises the following steps: (1) adjusting the pH value of a molybdenum-containing tungstate solution to 5-10, so as to obtain a solution A; (2) adding a sulfate reducing bacterium strain and a carbon source to the solution A, and subjecting same to a sulfuration reaction, so as to obtain a solution B; and (3) adjusting the solution B until same is acidic, subjecting same to a heat preservation reaction to generate a precipitate, and filtering out the precipitate, so as to finish the separation and impurity removal of tungsten and molybdenum. In the present invention, a biotransformation technology is combined with chemical precipitation; sulfate ions are firstly reduced into sulfur ions by using sulfate reducing bacteria; the sulfur ions are then subjected to a thioation reaction with molybdate ions in a tungstate solution to form thiomolybdate; after the sulfuration process is completed, the pH is adjusted to convert MoS4 2- into a MoS3 precipitate; therefore, the purpose of efficiently removing molybdenum is achieved. Provided is a brand new technology for efficient separation of tungsten and molybdenum during a tungsten smelting process, which method can effectively remove 94% or more of molybdenum in a sodium tungstate solution.
Inventors:
FENG HAO (CN)
ZHOU WEI (CN)
CAI XIANG (CN)
HUANG JIAN (CN)
HUANG YI (CN)
ZHOU WEI (CN)
CAI XIANG (CN)
HUANG JIAN (CN)
HUANG YI (CN)
Application Number:
PCT/CN2022/108809
Publication Date:
November 02, 2023
Filing Date:
July 29, 2022
Export Citation:
Assignee:
HUBEI GREEN TUNGSTEN CO LTD (CN)
International Classes:
C22B3/18; C22B3/44; C22B34/34
Foreign References:
| CN208218924U | 2018-12-11 | |||
| CN101434919A | 2009-05-20 | |||
| CN102642930A | 2012-08-22 | |||
| CN1251825A | 2000-05-03 | |||
| US6113868A | 2000-09-05 |
Attorney, Agent or Firm:
WUHAN ZHI JIA JOINT INTELLECTUAL PROPERTY AGENCY (GENERAL PARTNERSHIP) (CN)
Download PDF:
Previous Patent: GLASS PRODUCT FORMING MOLD
Next Patent: WIRELESS COMMUNICATION STRUCTURE, DISPLAY PANEL, AND WIRELESS COMMUNICATION DEVICE
Next Patent: WIRELESS COMMUNICATION STRUCTURE, DISPLAY PANEL, AND WIRELESS COMMUNICATION DEVICE