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通过对高磷铁矿中磷灰石还原机理的分析,发现配加碱性添加剂有利于抑制磷灰石还原,减少珠铁中磷含量。试验首先向含碳球团中配加CaCO3调节碱度,并在此基础上分别添加Na2CO3、CaF2,研究碱度和添加剂对球团还原熔分后珠铁和渣中磷含量的影响,得到磷的分配情况。试验结果表明:提高碱度,配加Na2CO3、CaF2均有利于抑制高磷铁矿中磷灰石的还原,降低珠铁中的磷含量。在1 400℃,碱度为1.4,Na2CO3、CaF2的质量分数均为4%,反应时间为12min时,珠铁中磷含量达到最低,脱磷率达到81.2%。
Through the analysis of the reduction mechanism of apatite in high-phosphorous iron ore, it was found that the addition of alkaline additives was effective in reducing the reduction of apatite and reducing the content of phosphorus in bead-iron. In the experiment, the basicity of CaCO3 was adjusted by adding CaCO3 to the carbonaceous pellets. On the basis of this, Na2CO3 and CaF2 were respectively added to study the effect of alkalinity and additives on the content of phosphorus in the pellets and slag after reduction and reduction, Distribution. The experimental results show that increasing alkalinity and adding Na2CO3 and CaF2 are good for inhibiting the reduction of apatite in high-phosphorus iron ore and reducing the content of phosphorus in bead-iron. At 1 400 ℃, the alkalinity was 1.4, the mass fraction of Na2CO3 and CaF2 were both 4% and the reaction time was 12min, the content of phosphorus in the beads was the lowest, and the dephosphorization rate reached 81.2%.