Method of manufacturing inorganic binder by reduction furnace slag and cured solid manufactured by the method

Patent metadata

Field	Value
Publication number	US-12415756-B2
Application number	US-202217994198-A
Country	US
Kind code	B2
Filing date	Nov 25, 2022
Priority date	Dec 16, 2021
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

A method of manufacturing inorganic binder by reduction furnace slag includes a raw material preparation step, a stirring step, a maintaining step and a drying step. The raw material preparation step is to provide a powder mixture containing 30 wt % to 55 wt % of reduction furnace slag, and 45 wt % to 70 wt % of glass powder. The stirring step is to place the powder mixture in a mixing tank, and add an alkali activator to the mixing tank to stir and react to form mixed slurry. The alkali equivalent (AE) of the mixed slurry is 2% to 7%, and the water-binder ratio is 0.25 to 0.4. The maintaining step is to place the mixed slurry in a high-temperature and high pressure maintaining environment for a maintaining time to get a binder. The drying step is to dry the binder.

First claim

What is claimed is:

1. A method of manufacturing an inorganic binder by reduction furnace slag, comprising:
a raw material preparation step: providing a powder mixture containing 30 wt % to 55 wt % of reduction furnace slag powder and 45 wt % to 70 wt % of glass powder, wherein the glass powder contains more than 85 wt % of SiO 2 , and the reduction furnace slag powder contains 26 wt % to 62 wt % of CaO, 20 wt % to 32 wt % of SiO 2 and 1.8 wt % to 12.5 wt % of Al 2 O 3 ;
a stirring step: placing the powder mixture in a mixing tank, and adding an alkali activator to the mixing tank to stir and react to form a mixed slurry, wherein an alkali equivalent (AE) of the mixed slurry is 2% to 7%, and a water-binder ratio is 0.25 to 0.4;
a maintaining step: placing the mixed slurry in a high-temperature and high-pressure maintaining environment for a maintaining time to get a binder, wherein the high-temperature and high-pressure maintaining environment is a temperature of 80 to 250° C. and a pressure of 0.3 to 2.5 MPa, and the maintaining time is 0.5 to 24 hours; and
a drying step: drying the binder to remove excess water, to thereby obtain an inorganic binder cured solid;
wherein the alkali equivalent is defined as Equation (1), and the water-binder ratio is defined as Equation (2),

alkali
⁢

equivalent

=

Weight
⁢

of
⁢

Na
2

⁢
O
⁢

in
⁢

alkali
⁢

activator

Weight
⁢

of
⁢

powder
⁢

mixture

⋆

100
⁢
%

;

and

Equation
⁢

(
1
)

water
-
binder
⁢

ratio
(

W
/
B

)

=

Weight
⁢

of
⁢

water
⁢

in
⁢

alkali
⁢

activator

+

weight
⁢

of
⁢

additional
⁢

water

Weight
⁢

of
⁢

solid
⁢

in
⁢

alkali
⁢

activator

+

weight
⁢

of
⁢

powder
⁢

mixture

.

Equation
⁢

(
2
)

2. The method of manufacturing an inorganic binder by reduction furnace slag according to claim 1 , wherein the alkali activator is NaOH, and the alkali equivalent of the mixed slurry is 4% to 6%.

3. The method of manufacturing an inorganic binder by reduction f

Assignees

• Univ Nat Cheng Kung
• Sanfan Internal Invest Co Ltd

Inventors

• Huang Jong-Shin
• Ko Wen-Pi
• Lin Ting-Chun

Classifications

• C04B20/1074

  Silicates, e.g. glass · CPC title

• C04B7/43

  Heat treatment, e.g. precalcining, burning, melting; Cooling {(aspects only relating to the installation F27B)} · CPC title

• C04B7/40

  Dehydrating; Forming, e.g. granulating (apparatus for granulating B01J2/00) · CPC title

• C04B7/147

  Metallurgical slag · CPC title

• Y02P40/10

  Production of cement, e.g. improving or optimising the production methods; Cement grinding · CPC title