Method for recovering gold and gold recovery facility

Patent metadata

Field	Value
Publication number	US-2020318217-A1
Application number	US-202016908003-A
Country	US
Kind code	A1
Filing date	Jun 22, 2020
Priority date	Dec 27, 2017
Publication date	Oct 8, 2020
Grant date	—

Abstract

Provided are a method for recovering gold, in which gold is recovered from a solution containing a gold cyano complex using a crosslinked resin containing a vinyl amine unit, by which gold can be efficiently recovered from the solution not only in a case (A) where a concentration of the gold cyano complex in the solution is low but also in a case (B) where another metal is dissolved in the solution; a method for recovering gold, in which the crosslinked resin and the solution are brought into contact with each other to separate the crosslinked resin and the solution from each other, by which gold can be efficiently recovered from the solution not only in the case (A) but also in the case (B); and a gold recovery facility comprising: a container inside which the crosslinked resin is accommodated in a flowable manner; and a device which feeds the solution to the container, by which gold can be efficiently recovered from the solution not only in the case (A) but also in the case (B).

First claim

1 . A method for recovering gold, in which gold is recovered from a solution containing a gold cyano complex using a crosslinked resin containing a vinyl amine unit.

2 . A method for recovering gold, in which a crosslinked resin containing a vinyl amine unit and a solution containing a gold cyano complex are brought into contact with each other to separate the crosslinked resin and the solution from each other.

3 . The method for recovering gold according to claim 1 , wherein the solution is a drainage obtained after recovering gold in a cyaniding method.

4 . The method for recovering gold according to claim 3 , wherein the solution is a drainage obtained after recovering gold by an adsorption treatment with activated carbon or a precipitation treatment with addition of zinc in the cyaniding method.

5 . The method for recovering gold according to claim 1 , wherein at least a part of the vinyl amine unit in the crosslinked resin forms a salt with an acid, and the acid is at least one selected from the group consisting of mineral acid, formic acid, and acetic acid.

6 . The method for recovering gold according to claim 1 , wherein the solution contains impurity ions containing a metal other than gold, and
the solution and the crosslinked resin are brought into contact with each other at a pH of 3.5 or less.

7 . The method for recovering gold according to claim 2 , wherein the solution is a drainage obtained after recovering gold in a cyaniding method.

8 . The method for recovering gold according to claim 7 , wherein the solution is a drainage obtained after recovering gold by an adsorption treatment with activated carbon or a precipitation treatment with addition of zinc in the cyaniding method.

9 . The method for recovering gold according to claim 2 , wherein at least a part of the vinyl amine unit in the crosslinked resin forms a salt with an acid, and the acid is at least one selected from the group consisting of mineral acid, formic acid, and acetic acid.

10 . The method for recovering gold according to claim 2 , wherein the solution contains impurity ions containing a metal other than gold, and
the solution and the crosslinked resin are brought into contact with each other at a pH of 3.5 or less.

11 . A gold recovery facility comprising: a container inside which a crosslinked resin containing a vinyl amine unit is accommodated in a flowable manner; and a device which feeds a solution containing a gold cyano complex to the container.

Assignees

• Mitsubishi Chem Corp

Inventors

• Ansai Ryuichi
• OONO Fumi
• Sakuma Satoshi
• Satou Fumiaki
• Ishii Akihiro
• Mori Yasuharu

Classifications

• Y02P10/20

  Recycling · CPC title

• C22B3/24

  by adsorption on solid substances, e.g. by extraction with solid resins · CPC title

• C22B3/41

  using a solution of normally solid organic compounds, e.g. dissolved polymers, sugars, or the like · CPC title

• C22B11/04 Primary

  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

• C02F1/28

  by sorption (using ion-exchange C02F1/42; sorbent compositions B01J) · CPC title