碳热还原转炉渣脱磷的试验

 对碳热还原转炉渣进行热力学分析，分别在二硅化钼高温电阻炉和500 kg顶底复吹多功能试验炉开展转炉渣碳热还原脱磷的实验室试验。结果表明，反应温度及动力学条件对脱磷率有较大影响，在电阻炉试验条件下，保证反应温度为1 500 ℃、碳当量为3.0、保温时间为30 min的情况下，可以获得30%左右的脱磷率。在顶底复吹多功能试验炉内，焦粉既作为还原剂也作为升温剂，焦粉与氧气反应放热可以保证脱磷反应在较高温度下进行，同时顶吹氧气对熔渣层的良好搅拌有利于脱磷反应速度进一步提高，试验过程脱磷率为84%，其中还原进入钢液的脱磷率为75.85%，气化脱磷率为8.15%。焦粉带入的硫有10.8%进入钢水，有6.25%进入炉渣。

Experiments on dephosphorization of BOF slag by carbothermal reduction

The thermodynamic analysis of dephosphorization of BOF slag by carbothermal reduction was studied,and many experimental studies were carried out in the molybdenum disilicide high-temperature heat treatment resistance fur-nace and the 500 kg top and bottom combined blowing multifunctional furnace. The results indicated that reaction tem-perature and dynamic condition had significant effects on the dephosphorzition rate. In the high temperature heat treat-ment resistance furnace,1 500℃reaction temperature can be guaranteed and about 30%dephosphorzition rate can be reached under the condition of carbon equivalent 3.0 and 30 min holding time. In the top and bottom combined blowing multifunctional furnace,coke powder can be used as reduction material and heating-up material. Dephosphorization re-action processing under the high temperature can be guaranteed by the exothermal reaction between coke powder and ox-ygen. Meanwhile,the top-blowing oxygen agitated the molten slag layer,which benefit to increasing the dephosphoriza-tion rate more,dephosphorization rate reached 84%in the whole process,thereinto,dephosphorization rate in the mol-ten pool was 75.85%,dephosphorization rate of evapouration was 8.15%. 10.8% sulphur carried by coke powder en-tered the molten steel and 6.25%entered the molten slag.