IP Library › Granted Patent US 12,264,100
Granted Patent B2
US 12,264,100 · App. 17/262,869 · Granted Apr 1, 2025

Use of a clay for producing a pozzolanic material

Inventors: Olivier Martinage (Lyons, FR); François Hue (Bourgoin Jallieu, FR)
Assignee: VICAT
C04B18/021C04B14/06C04B14/303C04B14/308C04B28/04C04B33/131C04B40/0042C04B2103/0088
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Quick Facts
Patent No.
US 12,264,100
App. No.
17/262,869
Granted
Apr 1, 2025
Kind
B2
Abstract

The use of a clay including: less than 25% of kaolinite; and at least 20% of muscovite and/or illite; the muscovite and/or illite/kaolinite weight ratio being greater than 1, for the preparation of a pozzolanic material.

Claims (27)

1. A method for preparing a pozzolanic material, consisting essentially of

optionally drying a pre-calcined clay, wherein the pre-calcined clay comprises:

less than 25% by weight of kaolinite,

at least 20% by weight of at least one of muscovite and illite,

wherein the at least one of muscovite and illite has the highest content of all minerals in the pre-calcined clay, and

wherein a weight ratio of the at least one of muscovite and illite to the kaolinite is greater than 1,

following any optional drying, optionally grinding the pre-calcined clay until the pre-calcined clay has a median diameter less than or equal to 25 μm,

calcining the pre-calcined clay to obtain a calcined clay, and

optionally disagglomerating the calcined clay until a median diameter of 10 μm to 20 μm is reached.

2. The method according to claim 1 , wherein the pre-calcined clay contains less than 22% by weight of kaolinite.

3. The method according to claim 2 , wherein the pre-calcined clay contains less than 20% by weight of kaolinite.

4. The method according to claim 1 , wherein the pre-calcined clay contains at least 1% by weight of kaolinite.

5. The method according to claim 1 , wherein the pre-calcined clay contains at least 25% by weight of the at least one of muscovite and illite.

6. The method according to claim 5 , wherein the pre-calcined clay contains 25% to 50% by weight of the at least one of muscovite and illite.

7. The method according to claim 1 , wherein the weight ratio of the at least one of muscovite and illite to the kaolinite is greater than 2.

8. The method according to claim 1 , wherein the pre-calcined clay further contains at least 1% by weight calcite.

9. The method according to claim 1 , wherein the pre-calcined clay further contains an amorphous phase containing one or more of silica, alumina and calcium.

10. The method according to claim 1 , wherein the pre-calcined clay further contains one or more of chlorite, quartz, dolomite, microcline, hematite and smectite.

11. The method according to claim 1 , wherein the calcination is conducted at a temperature of from 650° C. to 900° C.

12. The method according to claim 1 , wherein the calcination is conducted in a rotary calciner for about 30 to 90 minutes.

13. The method according to claim 1 , wherein the calcination is conducted in a flash calciner for about 2 seconds or less.

14. A method for preparing a pozzolanic material, comprising

calcination of a material consisting of clay, wherein the clay is a natural material consisting essentially of silicates and phylosilicates and wherein the clay prior to calcination (pre-calcined clay) includes:

less than 25% by weight of kaolinite,

at least 20% by weight of at least one of muscovite and illite,

wherein the at least one of muscovite and illite has the highest content of all minerals in the pre-calcined clay, and

wherein a weight ratio of the at least one of muscovite and illite to the kaolinite is greater than 1.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 25, 2021
From: MARTINAGE, OLIVIER; HUE, FRANÇOIS
To: VICAT
Reel/Frame 055017/0095 →
Priority Claims (1)
FR 1857273 · Aug 3, 2018 · national
Continuity (1)
Related Publication 20220363601A1 · Nov 17, 2022
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