Method for recovering gold from activated carbon

Patent metadata

Field	Value
Publication number	US-2017356066-A1
Application number	US-201515539552-A
Country	US
Kind code	A1
Filing date	Dec 4, 2015
Priority date	Dec 23, 2014
Publication date	Dec 14, 2017
Grant date	—

Abstract

The present invention is intended for effectively removing copper, iron, sulfur, which are impurities, from activated carbon on which gold is adsorbed before gold eluting in the point of view of gold recovery, and is related to a method for eluting gold from an activated carbon on which at least sulfur (S) and gold (Au) are adsorbed, whereas the activated carbon is washed with an alkali solution before eluting the gold, and then the gold is eluted from the activated carbon.

First claim

1 . A method for eluting gold from an activated carbon on which at least sulfur (S) and gold (Au) are adsorbed, wherein the activated carbon is washed with an alkali solution before eluting the gold, and then the gold is eluted from the activated carbon.

2 . A method for eluting gold from activated carbon on which at least sulfur (S) and gold (Au), as well as either or both of copper (Cu) and iron (Fe) are adsorbed, wherein the activated carbon is washed with an acid solution and an alkali solution before eluting the gold, and then the gold is eluted from the activated carbon.

3 . The method for eluting gold according to claim 2 , wherein the acid solution used for washing is hydrochloric acid with a concentration of 0.1 to 5 mol/L.

4 . The method for eluting gold according to claim 1 , wherein a concentration of hydroxide ion in the alkali solution used for washing is more than 0.1 mol/L, and no more than 2.0 mol/L.

5 . The method for eluting gold according to claim 1 , wherein a temperature of the alkali solution is less than 50° C.

6 . The method for eluting gold according to claim 1 , wherein the activated carbon is obtained by contacting an activated carbon with a solution obtained by leaching gold from a copper sulfide ore containing gold or a gold ore.

7 . The method for eluting gold according to claim 1 , wherein the activated carbon is obtained by contacting an activated carbon with a solution obtained by leaching gold with a chloride media from a copper sulfide ore containing gold or a gold ore.

8 . The method for eluting gold according to claim 1 , wherein the gold is eluted with cyanide solution.

9 . A method for recovering a gold, wherein the gold is recovered by electrowinning from a gold-containing solution obtained by the method of eluting gold according to claim 1 .

10 . The method for eluting gold according to claim 2 , wherein a concentration of hydroxide ion in the alkali solution used for washing is more than 0.1 mol/L, and no more than 2.0 mol/L.

11 . The method for eluting gold according to claim 2 , wherein a temperature of the alkali solution is less than 50° C.

12 . The method for eluting gold according to claim 2 , wherein the activated carbon is obtained by contacting an activated carbon with a solution obtained by leaching gold from a copper sulfide ore containing gold or a gold ore.

13 . The method for eluting gold according to claim 2 , wherein the activated carbon is obtained by contacting an activated carbon with a solution obtained by leaching gold with a chloride media from a copper sulfide ore containing gold or a gold ore.

14 . The method for eluting gold according to claim 2 , wherein the gold is eluted with cyanide solution.

15 . A method for recovering a gold, wherein the gold is recovered by electrowinning from a gold-containing solution obtained by the method of eluting gold according to claim 2 .

Assignees

• Jx Nippon Mining & Metals Corp

Inventors

• Hatano Kazuhiro
• Yoshimura Akira
• Tatsumi Ryosuke

Classifications

• C01B17/033

  using a liquid extractant · CPC title

• C22B11/08 Primary

  by cyaniding · CPC title

• B01J38/485

  Impregnating or reimpregnating with, or deposition of metal compounds or catalytically active elements · CPC title

• C22B11/04

  by wet processes (extraction of metal compounds by leaching in organic solutions C22B3/16; treatment or purification of solutions by liquid-liquid extraction C22B3/26) · CPC title

• B01J20/3416

  of sorbents or filter aids comprising free carbon, e.g. activated carbon · CPC title