转炉熔渣气化脱磷时磷迁移规律研究

气化脱磷能够有效地去除熔渣中部分P2O5,扩大其磷容量.在实验室进行了焦炭还原转炉渣气化脱磷热态试验,热力学计算研究结果表明,在1540℃下焦炭会优先还原P2 O5,还原产物为可能的P2,而P2 O5的实际还原率与理论计算值基本一致.通过SEM-EDS对还原前后炉渣形貌进行分析,转炉终渣主要由C2 S相、RO相、钙铁橄...

Phosphorus migration behavior during converter slag gasification and dephos-phorization

Gasification dephosphorization can effectively remove part of the P₂O₅ in the slag and expand its phosphorus capacity.The thermal state test of coke reduction converter slag gasification and dephosphorization was carried out in the laboratory.The thermodynamic calculation results showed that coke would preferentially reduce P₂O₅ at 1540℃,the reduction product was possible P₂,and the actual reduction rate of P₂O₅ was basically the same as the theoretical calculation value.The morphology of the slag before and after reduction was analyzed by SEM-EDS.The final converter slag was mainly composed of C₂S phase,RO phase,Olivine phase,and P existed in the silicate phase micro-regions with high Ca and high Si content,it could be inferred that the C₂S phase was the enriched phase of P.After gasification dephosphorization,the FeO in the converter slag was reduced by coke to a bright white large-diameter granular elemental Fe phase,where the released P₂ would be adsorbed.With the increase of Fe content,the occurrence of P elements would also increase.Therefore,it could be inferred that during gasification dephosphorization,apart of P was discharged out of the furnace in the form of P₂ as furnace gas,and another part of P₂would be adsorbed by the Fe phase and deposited in the elemental Fe phase to form iron phosphide compounds.