Cement clinker calcinated on vertical kiln using full calcium carbide slag to instead limestone and its preparation method
A technology of cement clinker and calcium carbide slag, which is applied in the field of building materials, can solve problems such as affecting the stability of cement, poor efficiency, and difficult batching, achieve significant economic and social benefits, realize resource recycling and comprehensive utilization, and reduce costs and the environment. The effect of protection
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Embodiment 1
[0048] Example 1: The weight ratio of each raw material is: calcium carbide slag 73%, shale 15%, iron raw material 4%, anthracite 8%, after drying the raw material to a moisture content of 14%, mixing and grinding Sieve through a 0.080mm square hole sieve and no more than 18% of the raw meal powder will remain. After fully stirring, the raw meal powder will be put into a ball tray to form balls. The particle size of the balls is Φ5-Φ15mm, and then the balls will be put into the kiln For calcination, the kiln firing temperature is controlled at 1400±50°C, the residence time in the high temperature zone is 5-10 minutes, and the cement clinker is obtained after cooling.
[0049] The physical and mechanical properties of the cement clinker calcined on the shaft kiln with the above formula are shown in Table 1, and its chemical composition and mineral composition are shown in Table 2:
[0050] Table 1: Mechanical properties of shaft kiln clinker
[0051] Coagulation time ...
Embodiment 2
[0055] Embodiment 2: the weight ratio of each raw material is: calcium carbide slag 84%, in, shale 7%, ferrous raw material 0.5%, anthracite 8.5%. The cement clinker prepared by the method in embodiment 1 on the shaft kiln, its mechanical properties are shown in Table 4, and its chemical composition and mineral composition are shown in Table 5:
[0056] Coagulation time min
Compressive strengthMpa
Flexural strength Mpa
stability
initial setting
final set
3 days
28 days
3 days
28 days
boil
135
205
28
64
6.5
8.5
qualified
[0057] mineral composition
chemical composition
C 3 S
C 2 S
C 3 A
C 4 AF
LOSS
CaO
SiO 2
AL 2 o 3
Fe 2 o 3
SO 3
MgO
49.01
17.24
11.15
12.25
0.15
65.21
23.51
6.15
2.04
1.42
1.15
[0058] Add a certain ...
Embodiment 3
[0060] Embodiment 3: The weight ratio of each raw material is: carbide slag 75%, shale 8%, iron raw material 5%, anthracite 12%. The mechanical properties of the cement clinker prepared by the method in Example 1 in the shaft kiln are shown in Table 7, and its chemical composition and mineral composition are shown in Table 8:
[0061] Coagulation time min
Compressive strengthMpa
Flexural strength Mpa
stability
initial setting
final set
3 days
28 days
3 days
28 days
boil
154
178
25
62
4.5
8.5
qualified
[0062] mineral composition
chemical composition
C 3 S
C 2 S
C 3 A
C 4 AF
LOSS
CaO
SiO 2
AL 2 o 3
Fe 2 o 3
SO 3
MgO
51.21
15.51
12.64
10.75
0.15
62.71
18.94
8.47
2.54
1.58
0.98
[0063] Add a certain proportion of mixed m...
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