REFRACTORY MORTARS
Refractory mortars are fine ground mixes, made up of degreasing substance and binders,which after mixing with water, result the wet mortar,used as a binder for binding the elements of the brick lining thermal equipment and industrial furnaces.
Refractory mortars what concern their setting mechanisms divide in three types :
- mortars with high temperature setting (common mortars or with ceramic binder, natural drying of these mortars isnot enough for their final setting.
- Air setting mortars(mortars setting at ambience temperature due to added chemical binders).
- Hydraulic setting mortars ( setting takes place by means of hydrating the binder (the cement).
It is used :
- In bricklaying refractory bricks from the same group and the same refractoriness or those with refractoriness having a higher pyroscopic index.
- In laying chamotte,chamotte with addition and alumina refractory products.
Refractory mortars are chosen in relationship with products’ exploiting condition,and with foreseen prescriptions of brickworks.
Independently from these,refractory mortars must be chemically homogenous,sufficiently resistant to thermal schocks,and should well fill the voids,to cover brickworks imperfections,to slowly release water to bricks,to achieve joints as thin as possible ,and to have a good adherence to the brickwork.
Half –acid chamotte and alumina refractory mortar
|
GRADE |
Refractoriness IP(min) |
Al2O3 % |
Fe2O3 % |
SiO2 % |
I.L. Ignition loss % |
Humidity % |
MB 69 |
169 |
- |
- |
63 |
2…4 |
3 |
|
MB 71 |
171 |
- |
- |
63 |
2…4 |
3 |
|
MC 69 |
169 |
27 |
- |
- |
3.5….6 |
3 |
|
MC 71 |
171 |
29 |
- |
- |
3.5….6 |
3 |
MC 73 |
173 |
31 |
- |
- |
3.5….6 |
3 |
|
MCA 75 |
175 |
37 |
2.2 |
- |
2.5….4 |
3 |
|
MD 77 |
177 |
43 |
2.2 |
- |
2…4 |
3 |
|
MD 79 |
179 |
48 |
2.0 |
- |
2…4 |
3 |
|
MD 82 |
182 |
58 |
1.8 |
- |
2…4 |
3 |
Silica alumina refractory mortar with aluminium monophosphate
|
GRADE |
max.using T oC |
Al2O3 % min. |
Fe2O3 % max. |
Ignition loss % max. |
Refractoriness IP, min |
Breaking strength through bending at 1000C N/mm2, min |
Setting time minutes |
|
|
Setting start max |
Setting end min
|
|||||||
M-D 77 f |
1400 |
50 |
2 |
4 |
177 |
0.3 |
30 |
144 |
|
M-D 79 f |
1450 |
55 |
2 |
3.5 |
179 |
0.3 |
30 |
144 |
|
M-D 82 f |
1500 |
60 |
1.8 |
3.5 |
182 |
0.4 |
30 |
144 |
|
M-FA 85 f |
1600 |
75 |
1.5 |
3 |
185 |
0.5 |
30 |
144 |
|
M-FA 52 f |
1300 |
80 |
1.5 |
3 |
152 |
0.3 |
30 |
144 |
|
M-FA 88 f |
1650 |
85 |
1.2 |
3 |
188 |
0.6 |
30 |
144 |
|
M-F 90 f |
1700 |
90 |
1 |
2.5 |
190 |
0.6 |
30 |
144 |
|
M-F 96 f |
1750 |
95 |
1 |
1 |
196 |
0.7 |
30 |
144 |
Silica alumina refractory mortars with sodium silicate
|
GRADE |
Al2O3 % min. |
P.C. % max. |
Refractoriness IP, min |
Breaking strength through bending at 1000C N/mm2, min |
Setting time |
||
|
After drying at 1000C |
After firing at 0C |
Start max |
End min
|
||||
|
M- D 79 s |
55 |
3,1…3,3 |
176 |
0,9 |
1450 3 |
30 |
120 |
|
M-FA85 s |
80 |
2,0…2,4 |
185 |
0,6 |
1550 5 |
30 |
120 |
|
M-F88s |
91 |
1,2…1,3 |
188 |
0,6 |
1570 5 |
30 |
120 |
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