Ladle top slag modifying method in converter or electric furnace smelting process
A technology for ladle top slag and electric furnace smelting, which is applied to the field of ladle top slag modification in the process of converter or electric furnace smelting, can solve the problems of ladle slag surface bubbles, slow melting of carburants, affecting production safety, etc., so as to reduce production costs. , The effect of reducing smoke and dust and reducing the difficulty of processing
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Embodiment 1
[0022] The method for improving ladle top slag during converter smelting SEDDQJ or EDDQJ comprises the following steps:
[0023] 1) Select coal or coal products with particle size ≤ 50mm, ash content ≤ 14%, volatile matter ≤ 10%, sulfur content ≤ 1.4%;
[0024] 2) Dry the coal or coal products so that the moisture content is ≤3%;
[0025] 3) At the beginning of the later stage of steelmaking and tapping in the converter or electric furnace, add coal or coal products to the surface of the top slag of the ladle continuously, uniformly, and at a constant speed. The amount of coal is 150kg. The amount is 300kg, which is beneficial to the adsorption of inclusions and improves the slag alkalinity of the ladle top slag;
[0026] 4) After tapping, continue to add coal or coal products to the surface of the top slag, the amount of coal is 150kg, and at the same time start blowing argon with a small amount of gas. The principle of keeping the surface of the molten steel from being expo...
Embodiment 2
[0029] Comparison data of test furnace slag samples:
[0030] project
CaO / %
FeO / %
TFe / %
MgO / %
Al2O3 / %
CaO / SiO2
Smelting end point
43.91
18.79
17.68
9.49
1.12
3.24
Test heat
51.21
6.91
7.55
6.94
0.82
3.62
[0031] Cost calculation: (the price is the price without tax)
[0032] Coal: 1200 yuan / ton, aluminum slag ball: 8050 yuan / ton
[0033] The cost of 300kg coal: 300×1.2=360 yuan
[0034] The cost of 350㎏ aluminum slag balls: 350×8.05=2817.5 yuan
[0035] Cost reduction after replacement:
[0036] 2817.5-360 = 2457.5 yuan.
[0037] Each furnace can reduce the cost by 2457.5 yuan, and the average furnace output of the plate steelmaking plant is 174 tons.
[0038] The reduced cost per ton of steel is: 2457.5÷174=14.12 yuan / ton of steel.
[0039] According to the comparison of the slag samples from the test furnace, the content of iron oxide in the slag is less than 7%, which meets the sl...
Embodiment 3
[0041] Use anthracite or products with anthracite as the main raw material (the proportion of anthracite is 40-95%) to carry out ladle top slag modification and aluminum slag ball modification. Comparison of slag sample data:
[0042] project
CaO / %
FeO / %
TFe / %
MgO / %
Al2O3 / %
CaO / SiO2
Smelting end point
43.91
18.79
17.68
9.49
1.12
3.24
Aluminum slag modification
31.39
6.81
7.63
7.33
35.83
8.03
Test heat
51.21
6.72
7.55
6.94
0.82
3.62
[0043] From the test data, it can be seen that the top slag is modified by adding anthracite or products with anthracite as the main raw material (the proportion of anthracite is 40-95%) and the TFe and FeO in the slag after the modification of the traditional process by adding aluminum slag balls The effect is the same, the goal of top slag modification is achieved, and the traditional top slag modifier can be completely replaced. The c...
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