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Effect of the Initial P Content on Dephosphorization of Hot Metal with Low Basicity Slag at 1623 K
Steel Research International ( IF 1.9 ) Pub Date : 2021-04-20 , DOI: 10.1002/srin.202100066 Wenkui Yang 1 , Jian Yang 1 , Runhao Zhang 1 , Han Sun 1
Steel Research International ( IF 1.9 ) Pub Date : 2021-04-20 , DOI: 10.1002/srin.202100066 Wenkui Yang 1 , Jian Yang 1 , Runhao Zhang 1 , Han Sun 1
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The effect of the initial P content ranging from 0.057% to 0.292% in hot metal on dephosphorization with low basicity (CaO/SiO2) slag at 1623 K is investigated using high-temperature laboratorial experiments. With increasing initial P content in the hot metal, the dephosphorization ratio increases first and then decreases, with the highest dephosphorization ratio of 83.2% at the initial P content in the hot metal of 0.173%. The phases in dephosphorization slags are basically consistent, which are mainly composed of nCa2SiO4-Ca3(PO4)2, Ca2SiO4, metal oxide, Ca3(PO4)2, Ca3Mg(SiO4)2, Ca2Fe2O5, and MgAl2O4. The compositions of all the P-rich phases are close to the connection line between Ca2SiO4 and Ca3(PO4)2 in the phase diagram. In addition, with increasing the initial P content in hot metal, the viscosity and activation energy values of the dephosphorization slag increases at the present dephosphorization temperature of 1623 K and the values of the activation energy of the dephosphorization slags increase gradually. The area fractions of Q0 + Q1 (Qi, i is the number of bridging oxygen per silicon atom) units decrease, whereas those of the Q2 + Q3 units increase. The average number of nonbridging oxygen per silicon atom (NBO/Si) value decreases, indicating that the degree of the polymerization (DOP) of the corresponding dephosphorization slag increases resulting in the increased viscosity.
中文翻译：
初始P含量对1623 K低碱度渣铁水脱磷的影响
使用高温实验室实验研究了铁水中 0.057% 至 0.292% 的初始 P 含量对低碱度 (CaO/SiO 2 ) 渣在 1623 K 下脱磷的影响。随着铁水中初始P含量的增加，脱磷率先增大后降低，在铁水中初始P含量为0.173%时脱磷率最高，达到83.2%。脱磷渣中的物相基本一致，主要由n Ca 2 SiO 4 -Ca 3 (PO 4 ) 2、Ca 2 SiO 4、金属氧化物、Ca 3 (PO 4) 2、Ca 3 Mg(SiO 4 ) 2、Ca 2 Fe 2 O 5和MgAl 2 O 4。所有富P相的组成接近Ca 2 SiO 4和Ca 3 (PO 4 ) 2之间的连接线在相图中。此外，随着铁水中初始P含量的增加，脱磷渣在1623K的当前脱磷温度下的粘度和活化能值增大，脱磷渣的活化能值逐渐增大。Q 0 + Q 1 ( Q i , i是每个硅原子的桥接氧的数量) 单元的面积分数减少，而Q 2 + Q 3的面积分数单位增加。每个硅原子的平均非桥氧数 (NBO/Si) 值降低，表明相应脱磷渣的聚合度 (DOP) 增加导致粘度增加。
更新日期：2021-04-20
中文翻译：
初始P含量对1623 K低碱度渣铁水脱磷的影响
使用高温实验室实验研究了铁水中 0.057% 至 0.292% 的初始 P 含量对低碱度 (CaO/SiO 2 ) 渣在 1623 K 下脱磷的影响。随着铁水中初始P含量的增加，脱磷率先增大后降低，在铁水中初始P含量为0.173%时脱磷率最高，达到83.2%。脱磷渣中的物相基本一致，主要由n Ca 2 SiO 4 -Ca 3 (PO 4 ) 2、Ca 2 SiO 4、金属氧化物、Ca 3 (PO 4) 2、Ca 3 Mg(SiO 4 ) 2、Ca 2 Fe 2 O 5和MgAl 2 O 4。所有富P相的组成接近Ca 2 SiO 4和Ca 3 (PO 4 ) 2之间的连接线在相图中。此外，随着铁水中初始P含量的增加，脱磷渣在1623K的当前脱磷温度下的粘度和活化能值增大，脱磷渣的活化能值逐渐增大。Q 0 + Q 1 ( Q i , i是每个硅原子的桥接氧的数量) 单元的面积分数减少，而Q 2 + Q 3的面积分数单位增加。每个硅原子的平均非桥氧数 (NBO/Si) 值降低，表明相应脱磷渣的聚合度 (DOP) 增加导致粘度增加。
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