Pan fiber-based gold adsorption material and its manufacturing method and gold recovery method using the same

Patent metadata

Field	Value
Publication number	US-2025256262-A1
Application number	US-202418649910-A
Country	US
Kind code	A1
Filing date	Apr 29, 2024
Priority date	Feb 14, 2024
Publication date	Aug 14, 2025
Grant date	—

Abstract

The present invention relates to a PAN fiber-based gold absorption material, a method of manufacturing the same, and a method of recovering gold using the same, which may implement an excellent gold absorbent property, excellent durability, excellent manufacturability, and excellent usability through a structure in which an alkylamine compound is immobilized on a polyacrylonitrile (PAN) fiber. The PAN fiber-based gold absorption material according to the present invention is provided to adsorb gold ions in water, which is configured to have a structure in which the alkylamine compound is immobilized on a PAN fiber surface.

First claim

What is claimed is:

1 . A PAN fiber-based gold absorption material comprising a structure in which an alkylamine compound is immobilized on a PAN fiber surface to adsorb gold ions in water.

2 . The PAN fiber-based gold absorption material of claim 1 , wherein a maximum absorption capacity of gold is 600 mg/g or more.

3 . The PAN fiber-based gold absorption material of claim 1 , wherein the alkylamine compound has a molecular weight of 25,000 g/mol or more.

4 . The PAN fiber-based gold absorption material of claim 1 , wherein the alkylamine compound is immobilized by an amination reaction between the alkylamine compound and the PAN fiber, and
wherein a molarity of grafted molecules of the alkylamine compound is less than 1 mmol/g at an occasion when the amination reaction is terminated.

5 . The PAN fiber-based gold absorption material of claim 1 , wherein the alkylamine compound is a branched alkylamine compound.

6 . The PAN fiber-based gold absorption material of claim 5 , wherein the branched alkylamine compound is one of branched poly (ethyleneimine) (bPEI), iso-buthylamine, sec-buthylamine, iso-amylamine, phosphoethanolamine (PEA), trimethylamine, or iso-propylamine, or a combination thereof.

7 . A method of recovering gold using a PAN fiber-based gold absorption material of claim 1 , the method comprising:
acidifying a solution to be treated that includes gold ions; and adding the PAN fiber-based gold absorption material to the solution to be treated under an acidic condition, wherein, upon addition of the gold absorption material to the solution to be treated under the acidic condition, amine functional groups provided in an alkylamine compound are bonded with hydrogen ions (H+) to electrically form a (+) polar state, the gold ions are bonded with negative ions to form a (−) polar state, and other metallic ions present in the solution to be treated maintain a positive ionic state, the gold ions in the (−) polar state are adsorbed to the amine functional groups in the (+) polar state, and the other metallic ions maintaining the positive ionic state are not adsorbed to the amine functional groups in the (+) polar state.

Assignees

• Korea Inst Sci & Tech

Inventors

• Choi Jae Woo
• Jung Youngkyun
• Jung Kyung-Won
• Yoon Sujin

Classifications

• B01J20/3272

  Polymers obtained by reactions otherwise than involving only carbon to carbon unsaturated bonds · CPC title

• B01J20/3278

  Polymers being grafted on the carrier · CPC title

• B01J20/321

  consisting of a polymer obtained by reactions involving only carbon to carbon unsaturated bonds · CPC title

• B01J20/3248

  the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such · CPC title

• B01J20/28023 Primary

  Fibres or filaments (fibres or filaments in the form of membranes B01J20/28038; B01J20/28007 takes precedence) · CPC title