Semi-steel making method
A slag and oxygen lance technology, applied in the field of iron and steel metallurgy, can solve the problems of serious phosphorus reversion in molten steel, difficult to control the amount of slag, slow down the production rhythm, etc. Effect
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[0021] Example 1
[0022] A steel mill uses 5-hole oxygen lance and 6-hole Raoul oxygen lance for semi-smelting steel. The nozzle parameters of 5-hole oxygen lance and 6-hole Raoul oxygen lance are shown in Table 1.
[0023] Table 1 Parameters of oxygen lance nozzle
[0024]
[0025] When a 5-hole oxygen lance is used for smelting in a 120-ton converter in a steel plant, the working pressure of the oxygen supply is 0.75MPa, and the oxygen supply intensity is 2.2m 3 / t Semi-steel . The amount of the first batch of slagging materials added is: active white ash 10kg / t Semi-steel ;Adding amount of high magnesium lime 20kg / t Semi-steel ;Addition of composite slagging agent 22kg / t Semi-steel . After starting to blow oxygen, blow nitrogen at the bottom, the gas supply intensity of nitrogen within 3 minutes after adding the slagging material is 0.0615m 3 / (min·t Semi-steel ), the gas supply intensity of bottom blowing nitrogen after 3min is 0.0256m 3 / (min·t Semi-steel ), the addition...
Example
[0034] Example 2
[0035] A steel plant uses 5-hole oxygen lance and 6-hole Raoul oxygen lance for semi-smelting steel. The nozzle parameters of 5-hole oxygen lance and 6-hole Raoul oxygen lance are shown in Table 4.
[0036] Table 4 Oxygen lance nozzle parameters
[0037]
[0038] When a 5-hole oxygen lance is used for smelting in a 120-ton converter in a steel plant, the working pressure of the oxygen supply is 0.75MPa, and the oxygen supply intensity is 2.5m 3 / t Semi-steel . The amount of the first batch of slagging materials added is: active white ash 20kg / t Semi-steel ;Adding amount of high magnesium lime 10kg / t Semi-steel ;Adding amount of composite slagging agent 10kg / t Semi-steel ; After starting to blow oxygen, blow nitrogen at the bottom, and the nitrogen supply intensity within 3 minutes after adding the slagging material is 0.0769m 3 / (min·t Semi-steel ), the gas supply intensity of bottom blowing nitrogen after 3min is 0.0410m 3 / (min·t Semi-steel ), the addition ...
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