Method for producing a pozzolanic or latent-hydraulic cement clinker substitute

Patent metadata

Field	Value
Publication number	US-10294152-B2
Application number	US-201415101572-A
Country	US
Kind code	B2
Filing date	Dec 4, 2014
Priority date	Dec 4, 2013
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

Methods for producing pozzolanic or latent hydraulic cement clinker substitutes may involve calcining clay with a fuel comprising a mineral substance at temperatures in the range from 500 to 1250° C., preferably from 550 to 1150° C., most preferably from 700 to 900° C. A resulting mixture of mineral substance from the fuel and the calcined clay forms a pozzolanic or latent hydraulic cement clinker substitute, in which a fraction of the mineral substance incorporated into the pozzolanic or latent hydraulic cement clinker substitute by the fuel is 1-60% by weight.

First claim

What is claimed is:

1. A method for producing a pozzolanic or latent-hydraulic cement clinker substitute, the method comprising calcining clay at temperatures of between 500 to 1250 degrees Celsius with a fuel comprising a mineral substance, wherein a resulting mixture of the mineral substance from the fuel and the calcined clay forms the pozzolanic or latent-hydraulic cement clinker substitute that includes 1-60% by weight of the mineral substance, wherein the fuel comprising the mineral substance has a ratio of Al 2 O 3 to SiO 2 of 0.13-1.4% by weight and a CaO content of less than 80% by weight.

2. The method of claim 1 wherein the resulting mixture of the mineral substance from the fuel and the calcined clay forms the pozzolanic or latent-hydraulic cement clinker substitute that includes 20-40% by weight of the mineral substance.

3. The method of claim 1 further comprising adjusting properties of the pozzolanic or latent-hydraulic cement clinker substitute via at least one of a particle size distribution of the fuel used for calcining or a composition of the mineral substance contained in the fuel.

4. The method of claim 1 further comprising adjusting a workability of the pozzolanic or latent-hydraulic cement clinker substitute by comminuting the fuel.

5. The method of claim 1 further comprising regulating a chemical composition of the mineral substance resulting from the calcining by using a mixture of fuels having different mineral substance compositions.

6. The method of claim 1 wherein the calcining is performed in a suspension heat exchanger, a rotary kiln, a fluidized bed, or a multitier furnace.

7. The method of claim 1 wherein the fuel is a flyash having a carbon fraction of at least 0.5% by weight.

8. The method of claim 1 further comprising comminuting the clay to particle sizes of less than 10 mm before the calcining.

9. The method of claim 1 further comprising calculating a fraction of the mineral substance supplied to the calcining so as to cause the pozzolanic or latent-hydraulic cement clinker substitute to have a mixing ratio of the calcined clay to the mineral substance of between 0.5:1 to 20:1.

10. The method of claim 1 wherein the fuel has a particle size of between 0.05 to 1 mm.

11. The method of claim 10 wherein the fuel is coal.

12. A method for producing a pozzolanic or latent-hydraulic cement clinker substitute, the method comprising:
calcining clay at temperatures of between 500 to 1250 degrees Celsius with a fuel comprising a mineral substance, wherein a resulting mixture of the mineral substance from the fuel and the calcined clay forms the pozzolanic or latent-hydraulic cement clinker substitute that includes 1-60% by weight of the mineral substance; and
supplying a flyash to the calcining of the clay and the fuel with the mineral substance.

13. The method of claim 12 wherein the fuel is a flyash having a carbon fraction of at least 0.5% by weight.

14. The method of claim 12 further comprising comminuting the clay to particle sizes of less than 10 mm before the calcining.

15. The method of claim 12 further comprising calculating a fraction of the mineral substance supplied to the calcining so as to cause the pozzolanic or latent-hydraulic cement clinker substitute to have a mixing ratio of the calcined clay to the mineral substance of between 0.5:1 to 20:1.

16. The method of claim 12 wherein the fuel is coal.

17. A method for producing a pozzolanic or latent-hydraulic cement clinker substitute, the method comprising calcining clay at temperatures of between 500 to 1250 degrees Celsius with a fuel comprising a mineral substance, wherein a resulting mixture of the mineral substance from the fuel and the calcined clay forms the pozzolanic or latent-hydraulic cement clinker substitute that includes 1-60% by weight of the mineral substance, wherein the fuel used in the calcining is supplemented with a fuel with a flyash having a carbon fraction of at least 0.5% by weight.

18. The method of claim 17 wherein the calcining is performed in a suspension heat exchanger, a rotary kiln, a fluidized bed, or a multitier furnace.

19. The method of claim 17 wherein the fuel is a flyash having a carbon fraction of at least 0.5% by weight.

20. The method of claim 17 further comprising calculating a fraction of the mineral substance supplied to the calcining so as to cause the pozzolanic or latent-hydraulic cement clinker substitute to have a mixing ratio of the calcined clay to the mineral substance of between 0.5:1 to 20:1.

Assignees

• Thyssenkrupp Ind Solutions Ag

Inventors

• Rohloff Kathrin
• Enders Michael

Classifications

• Y02P40/18

  Carbon capture and storage [CCS] · CPC title

• C04B7/26

  from raw materials containing flue dust {, i.e. fly ash (C04B7/243 takes precedence)} · CPC title

• C04B7/12 Primary

  Natural pozzuolanas; Natural pozzuolana cements; {Artificial pozzuolanas or artificial pozzuolana cements other than those obtained from waste or combustion residues, e.g. burned clay; Treating inorganic materials to improve their pozzuolanic characteristics (cements containing slag C04B7/14)} · CPC title

• C04B7/28 Primary

  from combustion residues, {e.g. ashes or slags from waste incineration}({C04B7/243} , C04B7/26 take precedence) · CPC title

• Y02P40/145

  Cross-Sectional Technologies · mapped topic