LF除尘灰应用于120t铁水包KR搅拌脱硫的工艺实践

Process Practice of LF Collected Dust Applied to 120 t Hot Metal Pot KR Stirring Desulphurization

初始s含量0．030％-0．070％的120t铁水进行KR搅拌脱硫预处理时，加入60—80kg高铝渣粉（／％：45．40A1、41．30A12O，4．65SIO2、1．17C、0．12P、0．33S）和971—1535kg钙基混合脱硫剂[／％：80．19CaO、6．20CaF，0．030（S＋P）]脱硫8rain铁水终点S含量为0．001％～0．005％，该脱硫剂成本占脱硫总成本的70％以上。为降低成本采用LF除尘灰（／％：4．2～8．8Si02、26—45CAO、7～15MgO、4—6TFe、20—40CaC2、10～20A1203、0．03～0．10P）替代部分混合脱硫剂，用60～80kg高铝渣粉，783—1365kg钙基混合脱硫剂＋190kgLF除尘灰对初始s含量0．030％～0．070％的120t铁水进行KR搅拌脱硫预处理8min，其终点s含量同样为0．001％一0．005％，取得较好的经济效果。

As adding 60 -80 kg high alumina slag powder （/%： 45.40A1, 41.30A1203, 4. 65Si02, 1.17C, 0. 12P, 0. 33S） and 971 - 1 535 kg calcium based mixed desulphurizer [/% ：80. 19CaO, 6. 20CaF2, 0. 030（ S ＋ P） ] in 120 t hot metal pot with 0. 030% -0. 070% initial S content to carry out KR stirring desulphurizing＇pretreatment for 8 min, the end S content in hot metal is 0. 001% - 0. 005%. With this process the cost of desulphurizer makes up more than 70% IP 1 1,- of the total cost of desulphurization. In order to reduce production cost, the LF collected dust （/% ： 4. 2 - 8.8SIO2,26 - 45CAO, 7 - 15MgO, 4 -6TFe, 20 -40CAC2, 10 -20A1203, O. 03 -0. 10P） is used to replace part of mixed desulphuri- zer. With adding 60 - 80 kg high alumina slag powder and 783 - 1 365 kg calcium based mixed desulphurizer ＋ 190 kg LF collected dust in 120 t pot with O. 030% - 0. 070% initial S content in hot metal to carry out KR stirring desulphurizing pretreatment for 8 rain, the hot metal end S content is also 0. 001% -0. 005% to get better economic effect.