Method for recovering magnesium by using sediment and sulfuric acid generated in electrolytic chlorine generation system using seawater and brackish water

Patent metadata

Field	Value
Publication number	US-2024360536-A1
Application number	US-202318569062-A
Country	US
Kind code	A1
Filing date	Jan 9, 2023
Priority date	Jan 11, 2022
Publication date	Oct 31, 2024
Grant date	—

Abstract

The present invention relates to a method for recovering magnesium from sediment generated in an electrolytic chlorine generation system using seawater or brackish water, the method comprising the steps of: eluting magnesium by using sulfuric acid in magnesium hydroxide, which is sediment generated in an electrolytic chlorine generation system using seawater and brackish water; precipitating magnesium sulfate by adding an organic solvent to a magnesium-eluted solution; and after the precipitation of the magnesium sulfate, separating the organic solvent and sulfuric acid by using a vacuum evaporation method, and reusing the organic solvent.

First claim

1 . A method for recovering magnesium from sediment generated in an electrolytic chlorine generation system using seawater or brackish water, comprising:
eluting magnesium using sulfuric acid in magnesium hydroxide, a sediment generated in an electrolytic chlorine generation system using seawater and brackish water; precipitating magnesium sulfate (MgSO 4 ·xH 2 O(s)) by adding an organic solvent to the magnesium elution solution; and, after precipitating the magnesium sulfate, the organic solvent and sulfuric acid are separated using reduced pressure evaporation and reusing the organic solvent.

2 . The method of claim 1 , wherein the sulfuric acid is waste sulfuric acid.

3 . The method of claim 2 , wherein the waste sulfuric acid was generated at industrial sites.

4 . The method of claim 1 , wherein the method comprises the step of treating sediment generated from an electrolytic chlorine generation system using seawater and brackish water with sulfuric acid (H 2 SO 4 ) to extract high concentration of magnesium, and then separating the magnesium sulfate using an organic solvent.

5 . The method of claim 1 , wherein the seawater is seawater concentrate.

6 . The method of claim 1 , wherein the organic solvent is ethanol or acetone.

7 . (canceled)

8 . The method of claim 1 , wherein the method comprises eluting magnesium using 0.5 to 1 M sulfuric acid in magnesium hydroxide, a sediment generated in an electrolytic chlorine generation system and mixing the eluent with the sulfuric acid to ethanol or acetone in a ratio of 1:1.5 to 1:2 (v:v) to precipitate magnesium.

9 . The method of claim 8 , wherein the method comprises eluting magnesium using 0.5 M sulfuric acid in magnesium hydroxide, a sediment generated in an electrolytic chlorine generation system and mixing the eluent with the sulfuric acid to acetone in a ratio of 1:2 (v:v) to precipitate magnesium.

10 . A magnesium compound recovered by the method of claim 1 .

11 . The magnesium compound according to claim 10 , wherein the magnesium compound is magnesium sulfate.

12 . The magnesium compound according to claim 10 , wherein the sulfuric acid is waste sulfuric acid.

13 . The magnesium compound according to claim 12 , wherein the waste sulfuric acid was generated at industrial sites.

14 . The magnesium compound according to claim 10 , wherein the seawater is seawater concentrate.

15 . The magnesium compound according to claim 10 , wherein the organic solvent is ethanol or acetone.

Assignees

• Knu Industry Cooperation Found

Inventors

• Chon Kangmin
• Lee Yong-Gu

Classifications

• C01F5/30

  Chlorides · CPC title

• C22B7/007

  by acid leaching · CPC title

• C22B3/44

  by chemical processes (treatment or purification of solutions by liquid-liquid extraction C22B3/26, by ion-exchange extraction C22B3/42) · CPC title

• C01F5/40

  Magnesium sulfates (double sulfates of magnesium with sodium or potassium C01D5/12, with other alkali metals {C01D15/00}, C01D17/00) · CPC title

• C01P2002/89

  by mass-spectroscopy · CPC title