Method of Direct Reductive Alloying of Chromium Ore in 90t Top and Bottom Combined Blowing Converter
A top-bottom combined blowing and alloying technology, which is applied in the manufacture of converters, etc., can solve the problems of converter smelting process control, difficulty in controlling the composition of the end point, difficulty in maintenance, high cost, and high viscosity, so as to protect the furnace lining and maintain stability , the effect of stable dynamic conditions
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Embodiment 1
[0025] In the present embodiment, the specific numerical value of each processing method is:
[0026] In the scrap steel loading method, the molten iron mixed in has a silicon content of 0.1% and a phosphorus content of 0.1% by weight, a temperature of 1260°C, an amount of molten iron loaded of 80t, and the amount of scrap steel added according to [100-(1280-1260)* 6 / 10-2*1600 / 80]*80 / 1000=3.84 tons, namely 3840kg.
[0027] In the slag addition and oxygen blowing method, in the first slagging process, 1600kg of active lime and 480kg of light-burned dolomite were added to the furnace before the blowing started, and oxygen was blown at a gun position of 1.7 meters. Add the second batch of active lime 800kg, lower the lance position to 1.6 meters at the same time, and continue blowing oxygen until 360s, stop blowing, lift the oxygen lance, and pour out 55% of the weight of the slag in the furnace; the second slagging process, one-time Add chrome ore 1600kg, Cr in the described ch...
Embodiment 2
[0031] In the present embodiment, the specific numerical value of each processing method is:
[0032] In the method of loading scrap steel, the content of silicon in the molten iron is 0.5% by weight, the content of phosphorus is 0.15%, the temperature is 1280°C, the amount of molten iron is 78t, and the amount of scrap steel is added according to [150-(1280-1280)* 5.5 / 10-1.6*2730 / 78]*78 / 1000 is calculated as 7332kg.
[0033] In the slag addition and oxygen blowing method, in the first slagging process, 1950kg of active lime and 624kg of light-burned dolomite were added to the furnace before the blowing started, and oxygen was blown at a gun position of 1.7 meters. Add the second batch of active lime 1170kg, lower the lance position to 1.6 meters at the same time, and continue blowing oxygen until 360s, stop blowing, lift the oxygen lance, and pour out 70% of the weight of the slag in the furnace; the second slagging process, one-time Add chrome ore 2730kg, Cr in the describe...
Embodiment 3
[0037] In the present embodiment, the specific numerical value of each processing method is:
[0038] In the method of loading scrap steel, the content of silicon in the molten iron is 0.3% by weight, the content of phosphorus is 0.08%, the temperature is 1300°C, the amount of molten iron is 82t, and the amount of scrap steel is added according to [125-(1280-1300)* 5.8 / 10-1.8*2460 / 82]*82 / 1000 is calculated as 6773.2kg.
[0039] In the slag addition and oxygen blowing method, in the first slagging process, 1800kg of active lime and 570kg of light-burned dolomite were added to the furnace before the blowing started, and oxygen was blown at a gun position of 1.7 meters. Add the second batch of active lime 985kg, lower the lance position to 1.6 meters at the same time, stop blowing when oxygen blowing continues to 345s, lift the oxygen lance, and pour out 60% of the weight of the slag in the furnace; the second slagging process, one-time Add chrome ore 2460kg, Cr in the described...
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