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在实验室条件下,以 CaO-Fe_2O_3-CaF_2碱性渣、石灰和苏达为精炼剂对生铁进行炉外处理。用碱性渣处理生铁时,终渣碱度1.5～2.0即可得到50～80%的脱磷效果,此时95%的硅已被氧化,碳的烧桶只有10%左右。降低生铁含硅量、低温、弱吹炼(氧气流量小)都有利于脱磷。采用由熔池底部喷入氧气和石灰的办法,石灰用量10～25公斤/吨铁,脱磷率可达55～78%。强吹炼有利脱磷。由熔池底部以中性气体为载体喷入6.4～12公斤/吨铁苏达可获得75～88%的脱硫效果,此时硅的氧化为50～64%。
Under laboratory conditions, pig iron was treated with CaO-Fe 2 O 3 -CaF 2 alkaline slag, lime and Sudar as refining agent. Alkaline slag processing pig iron, the final slag alkalinity 1.5 to 2.0 can be 50 to 80% of the dephosphorization effect, then 95% of the silicon has been oxidized, burning charcoal only about 10%. Reduce the silicon content of pig iron, low temperature, weak blowing (oxygen flow rate is small) are conducive to dephosphorization. Adopting the method of spraying oxygen and lime from the bottom of the molten pool, the dosage of lime is 10 to 25 kg / ton of iron, and the dephosphorization rate can reach 55 to 78%. Strong blowing favorable dephosphorization. From the bottom of the pool with a neutral gas carrier injection of 6.4 ~ 12 kg / t iron Sudar get 75 ~ 88% desulfurization effect, then the oxidation of silicon 50 to 64%.