An Improved Composite Fly Ash Gel to Extinguish Underground Coal Fire in Close Distance Coal Seams: A Case Study
Table 1
Test conditions.
Test number
Test condition
Test content
Class condition
Group
1
2
3
4
5
6
7
8
9
10
(1–1)
Total addition amount of suspending agent (%)
—
0.1
0.2
0.3
0.4
0.5
0.7
0.8
0.9
1.05
Settlement height of slurry at different time (cm)
Mass ratio of XK and XJ (XK 0.05%)
—
1 : 1
1 : 3
1 : 5
1 : 7
1 : 9
1 : 13
1 : 15
1 : 17
1 : 20
(1–2)
Total addition amount of suspending agent (%)
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
Quality ratio of XK and XJ
1 : 1
1 : 2
1 : 3
1 : 4
1 : 5
1 : 6
1 : 7
1 : 9
1 : 11
1 : 13
(1–3)
Total addition amount of suspending agent (%)
0
0.3
0.3
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Quality ratio of XK and XJ
—
1 : 0
0 : 1
1 : 5
1 : 5
1 : 5
1 : 5
1 : 5
1 : 5
1 : 5
(2)
Total addition amount of gelling agent (%)
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
Viscosity coefficient (MPa.s)
0.5
0.55
0.6
0.65
0.7
0.75
0.8
0.85
0.9
0.95
(3)
The addition amount of gelling agent (%)
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
0.55
0.6
0.65
0.7
0.75
0.8
0.85
0.9
0.95
The addition amount of new suspending agent (%)
New suspending agents of 0, 0.25, 0.3, and 0.35% are selected, respectively, and mixed with the gelling agent added to the abovementioned amount in turn, and then mixed with fly ash slurry, respectively
Note. The ratio in the table is mass ratio; “—” means that the corresponding suspending agent or pour point depressant is not added.
