Magnesia cement for the solidification of aqueous waste

Patent metadata

Field	Value
Publication number	US-2026094735-A1
Application number	US-202418901685-A
Country	US
Kind code	A1
Filing date	Sep 30, 2024
Priority date	Sep 30, 2024
Publication date	Apr 2, 2026
Grant date	—

Abstract

The present invention is directed to a solidified composition and a method of making such solidified composition. The solidified composition may have a lower leachate pH when compared to ordinary Portland cement. The solidified composition may be formed from a slurry comprising magnesium oxide, a salt, and water. Notably, the solidified composition may further comprise one or more actinides. The methods of the present invention are directed to making the aforementioned solidified compositions.

First claim

1 . A solidified composition comprising:
magnesium oxide; and a salt; wherein the solidified composition is formed from a slurry, the slurry comprising a first solution, the first solution comprising water, the first solution further comprising one or more actinides, one or more nitrate salts, or both.

2 . The solidified composition of claim 1 , wherein water is present in the slurry in an amount of about 10 wt. % or more.

3 . The solidified composition of claim 1 , wherein nitrate salts are present in the slurry, the nitrate salts being present in the slurry in an amount of about 30 wt. % or less.

4 . The solidified composition of claim 1 , wherein the magnesium oxide is light burned magnesium oxide.

5 . The solidified composition of claim 1 , wherein the magnesium oxide is dead burned magnesium oxide.

6 . The solidified composition of claim 1 , wherein the slurry comprises a heat sink additive.

7 . The solidified composition of claim 6 , wherein the heat sink additive is present in the slurry in an amount of about 1 wt. % or more.

8 . A solidified composition comprising:
magnesium oxide, wherein the solidified composition is formed from a slurry, the slurry comprising:
magnesium oxide, the magnesium oxide being present in the slurry in an amount of about 5 wt. % or more;
a salt, the salt being present in the slurry in an amount of about 1 wt. % or more; and
water, the water being present in the slurry in an amount of about 10 wt. % or more;
wherein the solidified composition has a leachate pH from about 7 to about 11.

9 . The solidified composition of claim 8 , wherein the solidified composition has a leachate pH from about 8 to about 10.

10 . The solidified composition of claim 8 , wherein the salt is an alkaline earth salt.

11 . The solidified composition of claim 8 , wherein the salt is a sulfate salt.

12 . The solidified composition of claim 8 , wherein the magnesium oxide is present in the slurry in an amount of about 10 wt. % or more.

13 . The solidified composition of claim 8 , wherein the slurry comprises one or more actinides.

14 . A solidified composition comprising:
magnesium oxide, wherein the solidified composition is formed from a slurry, the slurry comprising:
light burned magnesium oxide; and
dead burned magnesium oxide, the light burned magnesium oxide and the dead burned magnesium oxide being present in the slurry in a weight ratio from about 1:20 to about 10:1;
wherein the solidified composition comprises magnesium hydroxide and has a density greater than about 0.5 g/mL.

15 . The solidified composition of claim 14 , wherein the light burned magnesium is present in the slurry in an amount greater than about 5 wt. %.

16 . The solidified composition of claim 14 , wherein the dead burned magnesium is present in the slurry in an amount greater than about 5 wt. %.

17 . The solidified composition of claim 14 , wherein the solidified composition has a density greater than about 1 g/mL.

18 . The solidified composition of claim 14 , wherein the slurry comprises a salt.

19 . The solidified composition of claim 18 , wherein the salt is an alkaline earth salt.

20 . The solidified composition of claim 14 , wherein the slurry comprises one or more actinides.

Assignees

• Battelle Savannah River Alliance Llc

Inventors

• Jolin William C

Classifications

• C04B22/085

  containing nitrogen in the anion, e.g. nitrites · CPC title

• C04B22/142

  Sulfates · CPC title

• C04B2111/00767

  for waste stabilisation purposes · CPC title

• C04B9/00

  Magnesium cements or similar cements · CPC title

• G21F9/304 Primary

  Cement or cement-like matrix (compositional aspects C04B) · CPC title