Recovery method of useful resources in seawater and brine

Patent metadata

Field	Value
Publication number	US-2017029920-A1
Application number	US-201615097332-A
Country	US
Kind code	A1
Filing date	Apr 13, 2016
Priority date	Jul 31, 2015
Publication date	Feb 2, 2017
Grant date	—

Abstract

Provided is a recovery method of useful resources in seawater and brine, and more particularly, a recovery method of useful resources in seawater and brine capable of improving adsorption efficiency and recovery efficiency of trace amounts of useful resources such as strontium, lithium, boron, or the like, present in brine at low cost by using a magnetic adsorbent composite and a solid-liquid separation process which uses magnetic force.

First claim

What is claimed is:

1 . A recovery method of useful resources in seawater and brine, the recovery method comprising:
(a) adsorbing the useful resources in the seawater and brine using a magnetic adsorbent composite; (b) obtaining a useful resource desorption solution in which the useful resources are concentrated by desorbing the useful resources adsorbed in the magnetic adsorbent composite using a desorption solution; and (c) obtaining a compound from the useful resource desorption solution.

2 . The recovery method of claim 1 , wherein the magnetic adsorbent composite has a multilayer structure in which a core layer is made of magnetic particles, an adsorbent material layer is formed by coating a useful resource-adsorbent material on a surface of the core layer, and a binder layer is further formed between the core layer and the adsorbent material layer.

3 . The recovery method of claim 1 , wherein the useful resources are one or two or more selected among lithium, strontium, and boron.

4 . The recovery method of claim 2 , wherein the magnetic particles are made of one or two or more selected among iron, nickel, cobalt, manganese, gadolinium, and oxides thereof, magnetite, maghemite, iron monoxide, iron nitride, a cobalt platinum chromium alloy, a barium ferrite alloy, an aluminum manganese alloy, an iron platinum alloy, an iron palladium alloy, a cobalt platinum alloy, and a samarium cobalt alloy,
the binder layer contains carbon, and the adsorbent material includes manganese and manganese oxides.

5 . The recovery method of claim 1 , wherein the magnetic adsorbent composite is prepared by a preparation method including:
(1) mixing magnetic particles and a carbon precursor to prepare a mixture; (2) reacting the mixture at 150 to 250° C. to prepare magnetic particles on which a carbon layer is formed; and (3) mixing and reacting the magnetic particles on which the carbon layer is formed with an adsorbent material precursor solution.

6 . The recovery method of claim 5 , wherein in step (1), 50 to 300 parts by weight of the carbon precursor is contained in the mixture based on 100 parts by weight of the magnetic particles,
the carbon precursor is one or two or more selected among glucose, citric acid, and polyethylene glycol (PEG), and the preparation method further includes, after step (2) and step (3), separating the magnetic particles using magnetic force, washing the separated magnetic particles, and then drying the washed magnetic particles.

7 . The recovery method of claim 5 , wherein in step (3), a concentration of the adsorbent material precursor solution is 0.01 to 1M, and
a reaction is carried out under room temperature and atmospheric pressure conditions for 120 hours or more.

8 . The recovery method of claim 1 , further comprising, after step (a) and step (b), dispersing and washing the magnetic adsorbent composite in which the useful resources are adsorbed or from which the useful resources are desorbed in clean water, and separating the magnetic adsorbent composite using magnetic force.

9 . The recovery method of claim 1 , wherein the seawater and brine are seawater and brine from which dissolved magnesium and calcium are removed using a seawater electrolytic process.

10 . A magnetic adsorbent composite comprising:
a core layer containing a magnetic particle; a binder layer containing carbon coated on a surface of the core layer; and an adsorbent material layer formed by coating a useful resource-adsorbent material on the binder layer.

11 . The magnetic adsorbent composite of claim 10 , wherein the binder layer has an average thickness of 5 to 20 nm and is contained in the entire magnetic adsorbent composite in a content range of 5 to 15 wt %, and
the adsorbent material layer is contained in the entire magnetic adsorbent composite in a content range of 10 to 35 wt %.

Assignees

• Korea Inst Geoscience & Mineral Resources

Inventors

• Ryu Jungho
• Hong Hye-Jin
• Kim Byoung-Gyu
• Park In-Su
• Ryu Taegong
• Chung Kang-Sup

Classifications

• C22B26/20

  Obtaining alkaline earth metals or magnesium · CPC title

• C22B7/005 Primary

  Separation by a physical processing technique only, e.g. by mechanical breaking · CPC title

• B01J20/02

  comprising inorganic material · CPC title

• C02F1/28

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

• C02F2101/20

  Heavy metals or heavy metal compounds · CPC title