氧化钙类杂质对铁水脱磷的影响分析  

Effect of calcium oxide impurities on hot-metal dephosphorization

作　　者：孙国斌 向晓东 SUN Guobin;XIANG Xiaodong(College of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Hubei Provincial Industrial Safety Engineering Technology Research Center,Wuhan 430081,Hubei,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]湖北省工业安全工程技术研究中心,湖北武汉430081

出　　处：《钢铁研究学报》2021年第4期309-314,共6页Journal of Iron and Steel Research

摘　　要：除尘灰制备炼钢脱磷剂极具实用价值,但其所含CaO类杂质却会影响脱磷。1 400℃条件下,参考Fe_(2)O_(3)-CaO-CaCl_(2)系脱磷剂,分别利用不同摩尔比的Ca(OH)_(2)、CaCO_(3)替换脱磷剂中的CaO,对磷质量分数为0.3%的铁水进行了脱磷试验。同时,分别利用CaO、Ca(OH)_(2)、CaCO_(3)作为固定剂,研究了各自的铁水脱磷特征。此外,参考Fe_(2)O_(3)-CaO-SiO_(2)-CaCl_(2)系脱磷剂,分别利用CaO/SiO_(2)混合物、CaSiO3作为脱磷剂初始组分,研究了二者的脱磷差异。结果表明:当Ca(OH)_(2)以任意摩尔比替换脱磷剂中的CaO时,替换比对脱磷率的影响并不明显;但当使用CaCO_(3)进行替换时,脱磷率会在替换比超过约0.5后显著下降。而相对于CaO,当以Ca(OH)_(2)、CaCO_(3)作为固定剂时,脱磷速率能在初期获得明显提高,但在后期相对下降。此外,相对于CaO/SiO_(2)混合物,当以CaSiO3作为脱磷剂初始组分时,脱磷速率在前期和后期均能获得明显提高。The preparation of dusting ash for steelmaking dephosphorization is of great practical value, but the CaO impurities contained in the dusting ash will affect dephosphorization. Therefore, under the condition of 1 400 ℃, referring to the Fe_(2)O_(3)-CaO-CaCl_(2) dephosphorizer, the dephosphorization experiments of the hot metal containing 0.3 wt.% phosphorus was carried out by using different molar ratios of Ca(OH)_(2) and CaCO_(3) to replace the CaO in the dephosphorizer, respectively. Meanwhile, CaO, Ca(OH)_(2), and CaCO_(3) were used as fixatives to research dephosphorization characteristics of hot metal. In addition, referring to the Fe_(2)O_(3)-CaO-SiO_(2)-CaCl_(2) dephosphorizer, the CaO/SiO_(2) mixture and CaSiO3 were used as the initial components of the dephosphorizer to research the difference in dephosphorization between the two. The results show that when Ca(OH)_(2) replaces CaO in the dephosphorizer at any molar ratio, the replacement ratio has no obvious effect on the dephosphorization efficiency;but when CaCO_(3) is used for replacement, the dephosphorization efficiency will decrease significantly after the replacement ratio exceeds about 50%. Compared with CaO, when Ca(OH)_(2) and CaCO_(3) are used as fixatives, their dephosphorization rate can be significantly increased in the initial stage, but relatively decreased in the later stage. In addition, compared with the CaO/SiO_(2) mixture, when CaSiO3 is used as the initial component of the dephosphorizer, the dephosphorization rate can be significantly improved in the early and late stages.

关 键 词：铁水 脱磷 氧化钙 氢氧化钙 碳酸钙 硅酸钙 

分 类 号：TF713[冶金工程—钢铁冶金]