Method for clean metallurgy of molybdenum

Patent metadata

Field	Value
Publication number	US-2020399738-A1
Application number	US-201916975705-A
Country	US
Kind code	A1
Filing date	Apr 26, 2019
Priority date	May 3, 2018
Publication date	Dec 24, 2020
Grant date	—

Abstract

Disclosed is a method for clean metallurgy of molybdenum, including steps: 1) roasting molybdenite with calcium to obtain calcified molybdenum calcine, and leaching the calcified molybdenum calcine with an inorganic acid to obtain a molybdenum-containing inorganic acid leachate; 2) extracting molybdenum in the leachate with a cationic extractant to obtain an organic phase loaded with molybdyl cations and a raffinate; 3) using a hydrogen peroxide solution as a stripping agent to obtain a molybdenum stripping liquor; and 4) heating the molybdenum stripping liquor to dissociate peroxymolybdic acid therein so as to form a molybdic acid precipitate, and then calcining to obtain a molybdenum trioxide product. The method solves the problem of ammonia nitrogen wastewater production and can also be used for the enrichment and recovery of rhenium.

First claim

What is claimed is:

1 . A method for clean metallurgy of molybdenum, comprising the following steps:
1) roasting molybdenite with calcium to obtain a calcified molybdenum calcine, and leaching the calcified molybdenum calcine with an inorganic acid to obtain a molybdenum-containing inorganic acid leachate; 2) extracting molybdenum in the molybdenum-containing inorganic acid leachate obtained in step 1) with a cationic extractant to obtain an organic phase loaded with molybdyl cations and a raffinate, wherein the cationic extractant is one or more of P204, P507 or Cyanex272; 3) using a hydrogen peroxide solution as a stripping agent, and mixing the hydrogen peroxide solution with the organic phase loaded with molybdyl cations to obtain a molybdenum stripping liquor; and 4) heating the molybdenum stripping liquor to dissociate peroxymolybdic acid therein so as to form a molybdic acid precipitate, and then calcining to obtain a molybdenum trioxide product.

2 . The method for clean metallurgy of molybdenum according to claim 1 , wherein step 1) is leaching with the inorganic acid under a normal pressure and at a temperature of 75 to 96° C., and the inorganic acid is one or more of sulfuric acid, nitric acid, and hydrochloric acid.

3 . The method for clean metallurgy of molybdenum according to claim 2 , wherein step 1) is leaching with the inorganic acid under the normal pressure and at a temperature of 85 to 95° C., and a leaching time is 2 h to 6 h.

4 . The method for clean metallurgy of molybdenum according to claim 1 , wherein in step 1), a concentration of the inorganic acid is 2 to 4 mol/L, and a leachate to solid ratio (L/Kg) is 3:1 to 10:1.

5 . The method for clean metallurgy of molybdenum according to claim 1 , wherein in step 2), the cationic extractant is prepared into a kerosene solution before being added, and a volume fraction of the cationic extractant in the kerosene solution is 10% to 50%.

6 . The method for clean metallurgy of molybdenum according to claim 1 , wherein the raffinate obtained in step 2) is recycled to step 1) for use after being supplemented with the inorganic acid consumed in a leaching process of step 1), and a recycling is carried out multiple times for an enrichment and recovery of rhenium.

7 . The method for clean metallurgy of molybdenum according to claim 1 , wherein in step 2), an extraction phase ratio (O/A) is 2:1 to 1:3; and multistage counter-current extraction is used, and a number of stages of extraction is 3 to 5.

8 . The method for clean metallurgy of molybdenum according to claim 1 , wherein in step 3), a mass concentration of the hydrogen peroxide solution is 10% to 20%, and a stripping phase ratio (O/A) is 3:1 to 5:1.

9 . The method for clean metallurgy of molybdenum according to claim 1 , wherein step 3) uses multistage counter-current stripping, and a number of stages of stripping is 2 to 5.

10 . The method for clean metallurgy of molybdenum according to claim 1 , wherein in step 4), the molybdenum stripping liquor is heated to 90 to 100° C. to dissociate a peroxygen bond therein.

11 . The method for clean metallurgy of molybdenum according to claim 2 , wherein step 3) uses multistage counter-current stripping, and a number of stages of stripping is 2 to 5.

12 . The method for clean metallurgy of molybdenum according to claim 3 , wherein step 3) uses multistage counter-current stripping, and a number of stages of stripping is 2 to 5.

13 . The method for clean metallurgy of molybdenum according to claim 4 , wherein step 3) uses multistage counter-current stripping, and a number of stages of stripping is 2 to 5.

14 . The method for clean metallurgy of molybdenum according to claim 5 , wherein step 3) uses multistage counter-current stripping, and a number of stages of stripping is 2 to 5.

15 . The method for clean metallurgy of molybdenum according to claim 6 , wherein step 3) uses multistage counter-current stripping, and a number of stages of stripping is 2 to 5.

16 . The method for clean metallurgy of molybdenum according to claim 7 , wherein step 3) uses multistage counter-current stripping, and a number of stages of stripping is 2 to 5.

17 . The method for clean metallurgy of molybdenum according to claim 8 , wherein step 3) uses multistage counter-current stripping, and a number of stages of stripping is to 5.

18 . The method for clean metallurgy of molybdenum according to claim 2 , wherein in step 4), the molybdenum stripping liquor is heated to 90 to 100° C., to dissociate a peroxygen bond therein.

19 . The method for clean metallurgy of molybdenum according to claim 3 , wherein in step 4), the molybdenum stripping liquor is heated to 90 to 100° C. to dissociate a peroxygen bond therein.

20 . The method for clean metallurgy of molybdenum according to claim 4 , wherein in step 4), the molybdenum stripping liquor is heated to 90 to 100° C., to dissociate a peroxygen bond therein.

Assignees

• Univ Central South

Inventors

• Zhao Zhongwei
• Li Yongli

Classifications

• C22B3/26

  by liquid-liquid extraction using organic compounds · CPC title

• C01G39/02 Primary

  Oxides; Hydroxides · CPC title

• C22B34/34 Primary

  Obtaining molybdenum {(treatment or purification of solutions by adsorption on solids C22B3/24, by liquid-liquid extraction C22B3/26, by ion-exchange extraction C22B3/42; preparation of molybdenum involving liquid-liquid extraction, adsorption or ion-exchange C01G39/003)} · CPC title

• C22B3/06 Primary

  in inorganic acid solutions {, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions} · CPC title

• C22B1/02

  Roasting processes (C22B1/16 takes precedence) · CPC title