The invention discloses a converter
smelting process with low
lime consumption. The process comprises the steps that part of final
slag is reserved according to the content of P2O5 in converter
slag before converter tapping; after tapping, a deoxidizer is added according to the FeO content in the
slag to reduce the oxidizability of the slag; all light-burned
dolomite required in the dephosphorization period is added, slag splashing furnace protection operation is carried out,
scrap steel is added firstly, and all
lime required in the dephosphorization period is added; molten iron is added after the
lime is added, a deoxidizing gun is ignited, and return ore or ore is added to adjust slag components after ignition; after the dephosphorization time, the carbon content and the temperature reach the requirements, inverse dephosphorization slag operation is carried out; after slag pouring is finished, the deoxidizing gun is ignited for the second time, and the feeding amount is controlled according to the
alkalinity requirement; and
oxygen supply is stopped when the carbon and the temperature meet the requirements, and part of the final slag is reserved according to the
mass percentagecontent of P2O5 in the final slag for next
smelting in the furnace.
Lime consumption is reduced, the converter slag amount and the steel
material consumption are reduced, and the problems of
phosphorus enrichment,
phosphorus return and dry dedusting explosion release in the slag are avoided.