Method for collecting silver ions and phosphoric acid in waste fluid

Patent metadata

Field	Value
Publication number	US-9834825-B2
Application number	US-201514695496-A
Country	US
Kind code	B2
Filing date	Apr 24, 2015
Priority date	Sep 12, 2014
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A method for collecting silver ions and phosphoric acid in a waste fluid includes collecting silver chloride from the waste fluid, collecting silver chloride including providing a chloride compound to the waste fluid; and collecting phosphoric acid, collecting phosphoric acid including distilling the waste fluid from which the silver chloride has been collected.

First claim

What is claimed is:

1. A method for collecting silver ions and phosphoric acid in a waste fluid, the method comprising:
collecting silver chloride from the waste fluid by adding a chloride compound to the waste fluid; and
collecting phosphoric acid by distilling the waste fluid from which the silver chloride has been collected.

2. The method as claimed in claim 1 , wherein the chloride compound includes at least one of HCl, NaCl, CaCl 2 , or KCl.

3. The method as claimed in claim 1 , wherein collecting silver chloride from the waste fluid includes:
generating a mixed waste fluid by adding the chloride compound to the waste fluid; and
separating the silver chloride by filtering the mixed waste fluid.

4. The method as claimed in claim 3 , wherein separating the silver chloride is performed by using at least one of vacuum filtration, pressure filtration, or gravity filtration.

5. The method as claimed in claim 3 , wherein generating the mixed waste fluid is performed at a temperature of about 25° C. to about 80° C.

6. The method as claimed in claim 3 , wherein generating the mixed waste fluid is performed for about 10 minutes to about 120 minutes.

7. The method as claimed in claim 1 , wherein:
the waste fluid includes silver ions, and
a molar ratio between the chloride compound and the silver ions is about 1:2 to about 1:3.

8. The method as claimed in claim 1 , further comprising obtaining silver metal from the collected silver chloride.

9. The method as claimed in claim 8 , wherein obtaining silver metal is performed by using at least one of electrolysis, pyrolysis, or chemical treatment.

10. The method as claimed in claim 1 , wherein the chloride compound is an aqueous solution or a solid powder.

11. The method as claimed in claim 1 , wherein collecting phosphoric acid is performed at a temperature of about 80° C. to about 150° C.

12. The method as claimed in claim 1 , wherein collecting phosphoric acid is performed under a pressure of about 1 mmHg to about 760 mmHg.

13. A method for collecting silver ions and phosphoric acid in a waste fluid, the method comprising:
generating an acidic aqueous solution by distilling the waste fluid to remove volatile impurities from the waste fluid;
adding a chloride compound to the acidic aqueous solution; and
collecting silver chloride and phosphoric acid from the acidic aqueous solution to which the chloride compound has been added.

14. The method as claimed in claim 13 , wherein collecting silver chloride and phosphoric acid includes:
collecting precipitated silver chloride by filtering the acidic aqueous solution to provide a filtered acidic aqueous solution; and
collecting the phosphoric acid from the filtered acidic aqueous solution.

15. The method as claimed in claim 13 , wherein generating the acidic aqueous solution is performed at a temperature of about 80° C. to about 150° C.

16. The method as claimed in claim 13 , wherein generating the acidic aqueous solution is performed under a pressure of about 1 mmHg to about 760 mmHg.

17. The method as claimed in claim 13 , wherein the chloride compound includes one or more of HCl, NaCl, CaCl 2 , or KCl.

18. The method as claimed in claim 13 , wherein the chloride compound is an aqueous solution or a solid powder.

19. The method as claimed in claim 13 , wherein collecting silver chloride and phosphoric acid is performed at a temperature of about 25° C. to about 80° C.

20. The method as claimed in claim 13 , wherein collecting silver chloride and phosphoric acid is performed for about 10 minutes to about 120 minutes.

Assignees

• Samsung Display Co Ltd

Inventors

• Jeong Jihoon
• Kim Donghyun
• Kim Yeongil
• Choi Seungmo
• Noh Jinki
• Park Jiho
• Yoo Jeongsik
• Lee Young Il

Classifications

• C25C1/20

  of noble metals · CPC title

• Y02P10/214

  Cross-Sectional Technologies · mapped topic

• Y02W10/37

  using solar energy · CPC title

• C22B11/046 Primary

  from manufactured products, e.g. from printed circuit boards, from photographic films, paper or baths · CPC title

• C01B25/234

  Purification; Stabilisation; Concentration (purification concomitant with preparation C01B25/22; preparation involving solvent-solvent extraction C01B25/46) · CPC title