gas analyzer, CAI-NDIR-600 series. Readings are taken
automated via professional data acquisition program operated by LabView 14. After the selected reaction period, the
testing reactor was opened and the carbonated solid was
removed for its weight determination and further
investigation.
3 Results and Discussion
The selected industrial wastes were used as a good source of
calcium and magnesium oxides for carbon capture and
sequestration. The measured pH of LF slag, CKD and CLW
indicates high alkalinity. The reactions of alkaline oxides
with water are spontaneous and exothermic. Free lime and
magnesia readily react with water, even at ambient conditions, to form calcium hydroxide (portlandite) and magnesium hydroxide (brucite), respectively. Carbonation of solid
wastes was performed by the circulation of CO 2 through the
solid particles in the designed testing unit. The pH and TDS
were reduced after carbonation due to the conversion of
alkaline metal oxides and silicates into insoluble carbonates
(see Table 3).
3.1 Measurements of CO 2 Captured
Development concentration of output gas stream was measured by the gas analyzer instrument. LabView program was
used to measure the readings of the gas analyzer and then
saved the data in an Microsoft Excel sheet. The program has
an option to specify the period to record the readings, even
in milliseconds. LabView program was used as data acquisition to connect with laptop and read from the gas analyzer.
It then allows to calculate the amount of CO 2 consumed
through carbonation by subtracting the instantaneous reading
Table 2 Chemical analysis of
solid wastes using ICP
Type of waste
SiO 2
Al 2 O 3
FeO
CaO
MgO
LF slag
30.41
10.12
2.34
42.08
4.33
CKD
12.63
2.26
2.08
46.41
0.89
CLW
2.50
1.30
0.06
68.30
0.17
0
20
40
60
80
100
120
10
100
1000
% Passing
Dimeter (ђm)
LF Slag
CLW
CKD
Fig. 1 Grain size distribution of
LF slag, CLW and CKD
Table 3 pH and TDS of solid
wastes before and after
carbonation
Type of waste
pH
TDS (ppm)
Before
After
Before
After
LF slag
11.80
10.10
644
108
CKD
12.48
08.86
13,150
7460
CLW
12.27
11.08
8240
5370
Treatment of Industrial Alkaline Solid Wastes …
319
automated via professional data acquisition program operated by LabView 14. After the selected reaction period, the
testing reactor was opened and the carbonated solid was
removed for its weight determination and further
investigation.
3 Results and Discussion
The selected industrial wastes were used as a good source of
calcium and magnesium oxides for carbon capture and
sequestration. The measured pH of LF slag, CKD and CLW
indicates high alkalinity. The reactions of alkaline oxides
with water are spontaneous and exothermic. Free lime and
magnesia readily react with water, even at ambient conditions, to form calcium hydroxide (portlandite) and magnesium hydroxide (brucite), respectively. Carbonation of solid
wastes was performed by the circulation of CO 2 through the
solid particles in the designed testing unit. The pH and TDS
were reduced after carbonation due to the conversion of
alkaline metal oxides and silicates into insoluble carbonates
(see Table 3).
3.1 Measurements of CO 2 Captured
Development concentration of output gas stream was measured by the gas analyzer instrument. LabView program was
used to measure the readings of the gas analyzer and then
saved the data in an Microsoft Excel sheet. The program has
an option to specify the period to record the readings, even
in milliseconds. LabView program was used as data acquisition to connect with laptop and read from the gas analyzer.
It then allows to calculate the amount of CO 2 consumed
through carbonation by subtracting the instantaneous reading
Table 2 Chemical analysis of
solid wastes using ICP
Type of waste
SiO 2
Al 2 O 3
FeO
CaO
MgO
LF slag
30.41
10.12
2.34
42.08
4.33
CKD
12.63
2.26
2.08
46.41
0.89
CLW
2.50
1.30
0.06
68.30
0.17
0
20
40
60
80
100
120
10
100
1000
% Passing
Dimeter (ђm)
LF Slag
CLW
CKD
Fig. 1 Grain size distribution of
LF slag, CLW and CKD
Table 3 pH and TDS of solid
wastes before and after
carbonation
Type of waste
pH
TDS (ppm)
Before
After
Before
After
LF slag
11.80
10.10
644
108
CKD
12.48
08.86
13,150
7460
CLW
12.27
11.08
8240
5370
Treatment of Industrial Alkaline Solid Wastes …
319