A method of slagging with raw dolomite and magnesium in converter reblowing
A raw dolomite and converter technology, applied in the direction of manufacturing converters, etc., can solve the problems that the determination of the substitution amount is difficult to control, the speed of slag formation is affected, and the heat of the converter is insufficient, so as to stabilize the converter process operation, save energy, and feed materials. Manage simple effects
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Embodiment 1
[0026] Implementation conditions of this example: 200t converter, molten iron temperature 1300°C, molten iron silicon content 0.3%; according to the type of steel implemented, the tapping temperature is set at 1660°C, after calculation including scrap steel, the molten steel temperature can reach 1690°C , the temperature margin is 30°C; the content of MgO in the slag is required to be 7%, and the single slag method is used for smelting.
[0027] This embodiment uses raw dolomite to join the method for magnesium slagging, its steps:
[0028] 1) During the dephosphorization and desiliconization of 200-ton converter reblowing, add raw dolomite with a particle size of 5-20mm according to 20kg / ton of steel to meet the requirements of magnesium;
[0029] Since the single slag method is adopted, 20kg / ton of steel raw dolomite is added at one time; scrap steel is added at 140kg / ton of steel; since the temperature of molten steel is 30°C richer than the set temperature of tapping, it i...
Embodiment 2
[0033] Implementation conditions of this example: 250t converter, molten iron temperature 1305°C, molten iron silicon content 0.35%; according to the type of steel implemented, the tapping temperature is set at 1670°C, after calculation including scrap steel, the molten steel temperature can reach 1680°C , the temperature margin is 10°C; the content of MgO in the slag is required to be 6%, and the double slag method is used for smelting.
[0034] This embodiment uses raw dolomite to join the method for magnesium slagging, its steps:
[0035] 1) During dephosphorization and desiliconization of 250-ton converter reblowing, add raw dolomite with a particle size of 5-20mm and 29kg / ton of steel;
[0036] Since the double slag method is adopted, the raw dolomite is added in two times: at the same time as the re-blowing and opening blowing, 70% of the weight of the raw dolomite should be added according to the ton of steel, that is, 20.6kg / ton of steel is added. At the same time of ...
Embodiment 3
[0042] Implementation conditions of this example: 250t converter, molten iron temperature 1305°C, molten iron silicon content 0.3%; according to the type of steel to be implemented, the tapping temperature is set at 1675°C, after calculation including scrap steel, the molten steel temperature can reach 1666°C , the temperature is 9°C lower; the content of MgO in the slag is required to be 7%, and the single slag method is used for smelting.
[0043] This embodiment uses raw dolomite to join the method for magnesium slagging, its steps:
[0044] 1) During the dephosphorization and desiliconization period of the 250-ton converter reblowing, add raw dolomite with a particle size of 5~20mm and 31kg / ton of steel; according to the principle that the added raw dolomite should not exceed 30kg / ton of steel, Therefore, the excess part is converted into light-burned briquettes to meet the requirement that the Mg content in the slag is 7%;
[0045] Since the single slag method is adopted...
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