US 12,415,756 B2Granted

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

AssigneesNational Cheng Kung University, SanFan Internal investment CO., LTD.

InventorsJong-Shin Huang, Wen-Pi Ko, Ting-Chun Lin

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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.

Claims18

Dependent claims

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 SiO2, and the reduction furnace slag powder contains 26 wt % to 62 wt % of CaO, 20 wt % to 32 wt % of SiO2 and 1.8 wt % to 12.5 wt % of Al2O3;
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
)

98 more elements

Dependencies are inferred from the claim text.