Geopolymer molding production method and geopolymer molding production system

Patent metadata

Field	Value
Publication number	US-11708305-B2
Application number	US-201816481657-A
Country	US
Kind code	B2
Filing date	Jan 30, 2018
Priority date	Feb 3, 2017
Publication date	Jul 25, 2023
Grant date	Jul 25, 2023

Abstract

This geopolymer molding production method comprises: a mixing step (S1) for mixing a first material containing aluminum and silicon with a hydrate of an alkali stimulant containing a hydrate of an alkaline hydroxide and/or a hydrate of an alkaline silicate; a compaction step (S2) for compacting the mixture obtained in the mixing step (S1) into a compacted mixture; and a curing step (S3) for curing the compacted mixture.

First claim

The invention claimed is:

1. A geopolymer molding production method comprising:
a mixing step in which a first substance containing aluminum and silicon is mixed with hydrate of an alkaline stimulant containing alkaline hydroxide hydrate with aluminate;
a compression step in which a compressed mixture is formed by performing compression molding on a mixture obtained in the mixing step; and
a curing step in which the compressed mixture is cured,
wherein
the alkaline hydroxide hydrate with aluminate is at least one selected from lithium aluminate hydroxide hydrate, sodium aluminate hydroxide hydrate, potassium aluminate hydroxide hydrate, rubidium aluminate hydroxide hydrate, and cesium aluminate hydroxide hydrate.

2. The geopolymer molding production method according to claim 1 , wherein the compressed mixture is formed by further adding a spent radionuclide adsorbent in the compression step.

3. The geopolymer molding production method according to claim 1 , wherein temperature during curing in the curing step is above a melting point of hydrate contained in the mixture.

4. The geopolymer molding production method according to claim 1 , wherein a period for curing the compressed mixture in the curing step is 30 minutes or longer.

5. The geopolymer molding production method according to claim 1 , further comprising a drying step of drying the compressed mixture after the curing step.

6. The geopolymer molding production method according to claim 1 , wherein the first substance contains at least one selected from metakaolin, blast furnace slag, incineration ash, fly ash, zeolite, silica fume, amorphous silicon dioxide, aluminum oxide, and aluminum hydroxide.

7. The geopolymer molding production method according to claim 1 , wherein the hydrate contained in the mixture is a low-melting-point hydrate having a melting point of 0° C. or more and 100° C. or less.

8. The geopolymer molding production method according to claim 1 , wherein pressure for compressing the mixture is at least 1 MPa.

9. A geopolymer molding production method comprising:
a mixing step in which a first substance containing aluminum and silicon is mixed with hydrate of an alkaline stimulant containing alkaline silicate hydrate;
a compression step in which a compressed mixture is formed by performing compression molding on a mixture obtained in the mixing step; and
a curing step in which the compressed mixture is cured,
wherein the hydrate contained in the mixture is the alkaline silicate hydrate and contains at least one selected from lithium silicate hydrate, sodium silicate hydrate, potassium silicate hydrate, rubidium silicate hydrate, and cesium silicate hydrate.

10. The geopolymer molding production method according to claim 9 , wherein the compressed mixture is formed by further adding a spent radionuclide adsorbent in the compression step.

11. The geopolymer molding production method according to claim 9 , wherein temperature during curing in the curing step is above a melting point of hydrate contained in the mixture.

12. The geopolymer molding production method according to claim 9 , wherein a period for curing the compressed mixture in the curing step is 30 minutes or longer.

13. The geopolymer molding production method according to claim 9 , further comprising a drying step of drying the compressed mixture after the curing step.

14. The geopolymer molding production method according to claim 9 , wherein the first substance contains at least one selected from metakaolin, blast furnace slag, incineration ash, fly ash, zeolite, silica fume, amorphous silicon dioxide, aluminum oxide, and aluminum hydroxide.

15. A geopolymer molding production method comprising:
a mixing step in which a first substance containing aluminum and silicon is mixed with hydrate of an alkaline stimulant containing alkaline aluminate hydrate;
a compression step in which a compressed mixture is formed by performing compression molding on a mixture obtained in the mixing step; and
a curing step in which the compressed mixture is cured,
wherein the hydrate contained in the mixture is the hydrate containing alkaline aluminate hydrate and contains at least one selected from lithium aluminate hydrate, sodium aluminate hydrate, potassium aluminate hydrate, rubidium aluminate hydrate, and cesium aluminate hydrate.

16. The geopolymer molding production method according to claim 15 , wherein the compressed mixture is formed by further adding a spent radionuclide adsorbent in the compression step.

17. The geopolymer molding production method according to claim 15 , wherein temperature during curing in the curing step is above a melting point of hydrate contained in the mixture.

18. The geopolymer molding production method according to claim 15 , wherein a period for curing the compressed mixture in the curing step is 30 minutes or longer.

19. The geopolymer molding production method according to claim 15 , further comprising a drying step of drying the compressed mixture after the curing step.

20. The geopolymer molding production method according to claim 15 , wherein the first substance contains at least one selected from metakaolin, blast furnace slag, incineration ash, fly ash, zeolite, silica fume, amorphous silicon dioxide, aluminum oxide, and aluminum hydroxide.

Assignees

• Toshiba Kk
• Toshiba Energy Systems & Solutions Corp

Inventors

• Kawauchi Kanae
• Okabe Hirofumi
• Kaneko Masaaki
• Namiki Chiaki
• Sato Tatsuaki
• Nakamura Hideki
• Yamamoto Ryo
• Takahashi Fumi

Classifications

• C04B28/006 Primary

  containing mineral polymers, e.g. geopolymers of the Davidovits type · CPC title

• C04B12/005

  Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates · CPC title

• C04B18/0463

  Hazardous waste · CPC title

• C04B40/0071

  making use of a rise in pressure · CPC title

• C04B2103/0098

  Radioactive materials · CPC title