Apparatus and methods for lithium, calcium, and magnesium extraction
US-2025154624-A1 · May 15, 2025 · US
Facile, low-energy routes for the production of hydrated calcium and magnesium salts from alkaline industrial wastes
US12503372B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12503372-B2 |
| Application number | US-202318100283-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 23, 2023 |
| Priority date | Aug 18, 2017 |
| Publication date | Dec 23, 2025 |
| Grant date | Dec 23, 2025 |
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Abstract
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Divalent ions are extracted from solids by leaching to form a divalent ion-containing solution. The divalent ion-containing solution is subjected to concentration to form a concentrated divalent ion-containing solution. Precipitation of a divalent ion hydroxide salt is induced from the concentrated divalent ion-containing solution. In other cases, the concentrated divalent ion-containing solution is exposed to carbon dioxide to induce precipitation of a divalent ion carbonate salt.
First claim
Opening claim text (preview).
What is claimed is: 1 . A method comprising: extracting divalent ions from solids by leaching to form a divalent ion-containing solution; subjecting the divalent ion-containing solution to concentration to form a concentrated divalent ion-containing solution; and inducing precipitation of a divalent ion hydroxide salt from the concentrated divalent ion-containing solution; wherein subjecting the divalent ion-containing solution to concentration comprises using reverse osmosis or nanofiltration to separate divalent ions from monovalent ions. 2 . The method of claim 1 , wherein subjecting the divalent ion-containing solution to concentration is performed using a nanofiltration membrane. 3 . The method of claim 1 , wherein subjecting the divalent ion-containing solution to concentration is performed using a reverse osmosis membrane. 4 . The method of claim 1 , wherein inducing precipitation of a divalent ion hydroxide salt from the concentrated divalent ion-containing solution comprises contacting the concentrated divalent ion-containing solution with carbon dioxide. 5 . The method of claim 1 , wherein the solids include at least one of (a) slags or (b) fly ashes. 6 . The method of claim 1 , wherein extracting the divalent ions from the solids includes exposing the solids to a leaching solution. 7 . The method of claim 6 , wherein the leaching solution includes a leaching agent. 8 . The method of claim 6 , wherein the leaching solution includes an acid. 9 . The method of claim 1 , wherein extracting the divalent ions from the solids includes pulverizing the solids, and exposing the pulverized solids to a leaching solution. 10 . The method of claim 1 , wherein subjecting the divalent ion-containing solution to concentration further comprises subjecting the divalent ion-containing solution to capacitive concentration. 11 . The method of claim 10 , wherein subjecting the divalent ion-containing solution to capacitive concentration includes disposing the divalent ion-containing solution between a pair of electrodes, and applying an electrical input to the electrodes. 12 . The method of claim 10 , wherein subjecting the divalent ion-containing solution to capacitive concentration includes passing the divalent ion-containing solution through a series of n connected capacitive concentration cells, wherein n is 1 or greater. 13 . The method of claim 1 , wherein inducing the precipitation of the divalent ion hydroxide salt includes heating the concentrated divalent ion-containing solution to a temperature at or below 100° C. 14 . The method of claim 1 , wherein the divalent ions include calcium ions, and inducing the precipitation of the divalent ion hydroxide salt includes inducing precipitation of portlandite. 15 . The method of claim 1 , wherein the divalent ions include magnesium ions, and inducing the precipitation of the divalent ion hydroxide salt includes inducing precipitation of brucite.
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Classifications
Carbon capture and storage [CCS] · CPC title
of CO2 · CPC title
After-treatment, e.g. grinding, purification, conversion of crystal morphology · CPC title
Preparation involving liquid-liquid extraction, absorption or ion-exchange · CPC title
Seawater, e.g. for desalination · CPC title
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- What does patent US12503372B2 cover?
- Divalent ions are extracted from solids by leaching to form a divalent ion-containing solution. The divalent ion-containing solution is subjected to concentration to form a concentrated divalent ion-containing solution. Precipitation of a divalent ion hydroxide salt is induced from the concentrated divalent ion-containing solution. In other cases, the concentrated divalent ion-containing soluti…
- Who is the assignee on this patent?
- Univ California
- What technology area does this patent fall under?
- Primary CPC classification C02F9/00. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 23 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).