Method for treating polluted soil by a hydraulic binder with mayenite phase

Patent metadata

Field	Value
Publication number	US-10562083-B2
Application number	US-201716339243-A
Country	US
Kind code	B2
Filing date	Oct 4, 2017
Priority date	Oct 4, 2016
Publication date	Feb 18, 2020
Grant date	Feb 18, 2020

Abstract

A method for treating polluted soils, includes mixing the soil with a hydraulic binder, wherein the hydraulic binder includes: as the only high-alumina clinker, a high-alumina clinker including more than 80 wt % of mayenite C12A7 phase or a mayenite isotope, the high-alumina clinker making up at least 70 wt % of the weight of the hydraulic binder; and 1 wt % to 30 wt %, relative to the total weight of the binder, of lime.

First claim

The invention claimed is:

1. A method for treating polluted soils, comprising mixing said soil with a hydraulic binder, wherein the hydraulic binder comprises:
as the sole aluminous clinker, an aluminous clinker comprising more than 80% by mass of mayenite C12A7 phase or a mayenite isotype, said aluminous clinker represents at least 70% by weight of the weight of the hydraulic binder;
from 1 to 30% by weight, relative to the total weight of the binder, of lime.

2. The method according to claim 1 , wherein the aluminous clinker comprises as the sole aluminate phase the mayenite C12A7 phase.

3. The method according to claim 1 , wherein the lime is free lime, slaked lime, or a mixture of free lime and slaked lime.

4. The method according to claim 1 , wherein the hydraulic binder comprises from 5 to 25% by weight, relative to the total weight of the binder, of quicklime or slaked lime.

5. The method according to claim 1 , comprising mixing said soil with said hydraulic binder in soil/binder mass proportions comprised between 1 and 10 parts binder per 100 parts soil.

6. A method to stabilize soils in situ or before storage, comprising mixing said soil with a hydraulic binder, wherein the hydraulic binder comprises:
as the sole aluminous clinker, an aluminous clinker comprising more than 80% by mass of mayenite C12A7 phase or a mayenite isotype, said aluminous clinker represents at least 70% by weight of the weight of the hydraulic binder;
from 1 to 30% by weight, relative to the total weight of the binder, of lime.

7. The method according to claim 1 , wherein said polluted soils are polluted by anions and/or heavy metals.

8. The method according to claim 7 , wherein said anions are sulfate ions.

9. The method according to claim 3 , wherein the lime is slaked lime.

10. The method according to claim 6 , wherein said soils are polluted by anions and/or heavy metals.

11. The method according to claim 6 , wherein the aluminous clinker comprises as the sole aluminate phase the mayenite C12A7 phase.

12. The method according to claim 6 , wherein the hydraulic binder comprises from 5 to 25% by weight, relative to the total weight of the binder, of quicklime or slaked lime.

13. The method according to claim 6 , comprising mixing said soil with said hydraulic binder in soil/binder mass proportions comprised between 1 and 10 parts binder per 100 parts soil.

Assignees

• Holcim Technology Ltd

Inventors

• Tapsoba Nouffou
• Brouard Eric
• Comparet Cédric
• Ech Mohsen
• Richard Nicolas
• Levy Christophe

Classifications

• B09C2101/00

  In situ · CPC title

• C04B18/0472

  Waste material contaminated by heavy metals · CPC title

• C04B2111/00732

  for soil stabilisation · CPC title

• C04B7/32

  Aluminous cements · CPC title

• B09C1/08 Primary

  chemically · CPC title