Aluminum industrial red mud-based dephosphorizing agent for converter steelmaking and preparation method thereof
A converter steelmaking and dephosphorizing agent technology, applied in the manufacture of converters and other directions, can solve the problems of complex process, environmental pollution, and difficulty in promotion, and achieve the effects of low melting point, flexible operation and good fluidity
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Embodiment 1
[0023] In this example, aluminum industry red mud from an aluminum plant was selected as the raw material, and its chemical composition is shown in Table 1.
[0024] Table 1 Red mud chemical composition (mass%)
[0025] components
CaO
Na 2 o
K 2 o
Fe 2 o 3
SiO 2
al 2 o 3
TiO 2
P 2 o 5
other
content
44.51
6.93
1.25
12.11
20.17
9.25
2.84
0.6
2.34
[0026] The ratio of raw materials for the synthetic dephosphorization agent is as follows (all are mass fractions): 55% red mud, 29% iron balls, 10% lime, 5.5% lightly burned dolomite, and 0.5% water glass. A dephosphorization agent with a particle size of 15 mm was produced according to the aforementioned preparation method, wherein the calcination temperature was 400° C. and the calcination time was 3 hours. The binary basicity R of the dephosphorization agent is 2.5, and the melting point (hemispherical point temperat...
Embodiment 2
[0029] In this example, aluminum industry red mud from an aluminum plant was selected as the raw material, and its chemical composition is shown in Table 2.
[0030] Table 2 Red mud chemical composition (mass%)
[0031] components
CaO
Na 2 o
Fe 2 o 3
SiO 2
al 2 o 3
TiO 2
sc 2 o 3
P 2 o 5
other
[0032] content
42.09
5.00
18.66
18.10
9.18
6.72
0.02
0.1
0.58
[0033] The raw material ratio of the synthetic dephosphorization agent is as follows (all are mass fractions): 65% red mud, 20% iron balls, 9.5% lime, 5% lightly burned dolomite, 0.5% mixture of water glass and bentonite. A dephosphorization agent with a particle size of 20 mm was produced according to the aforementioned preparation method, wherein the calcination temperature was 350° C. and the calcination time was 3.5 hours. The binary basicity R of the dephosphorization agent is 2.8, and the me...
Embodiment 3
[0036] In this example, aluminum industry red mud from an aluminum plant was selected as the raw material, and its chemical composition is shown in Table 3.
[0037] Table 3 Red mud chemical composition (mass%)
[0038] components
CaO
Na 2 o
Fe 2 o 3
SiO 2
al 2 o 3
TiO 2
P 2 o 5
MgO
other
content
32.88
2.29
33.02
11.34
10.67
7.34
0.1
1.65
0.10
[0039] The ratio of raw materials for the synthetic dephosphorization agent is as follows (all are mass fractions): 70% red mud, 15% iron concentrate, 11.5% lime, 3% lightly burned dolomite, and 0.5% bentonite. A dephosphorization agent with a particle size of 25 mm was produced according to the aforementioned preparation method, wherein the calcination temperature was 350° C. and the calcination time was 3.5 hours. The binary basicity R of the dephosphorization agent is 3.3, and the melting point (hemispherical point tempera...
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