Development of hot metal pre-dephosphorization agent based on the resource utilization of sludge in continuous casting swirl wells
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摘要: 为了利用连铸旋流井沉泥开发铁水预脱磷剂以期实现沉泥的资源化，基于连铸旋流井沉泥的成分分析及脱磷热力学计算，配制了w(CaO)：w(沉泥)=0、7%、14%、20%、25%、30%的预脱磷剂，进行了熔化性能测定及脱磷效果评价试验。结果表明，连铸旋流井沉泥中（Fe2O3+FeO）含量较高、碱度为0.86，其作为配制脱磷剂的基料在热力学上可行。随着CaO配加比例由0增加至30%，脱磷剂的熔点先降低后升高，熔速先增大后减小，当w(CaO)：w(沉泥)=20%时，脱磷剂熔点最低，熔速最快。随着CaO配加比例由14%增加至25%，渣剂的脱磷率先上升后下降，金属Fe回收率逐渐增加，当w(CaO)：w(沉泥)=20%时，脱磷率和Fe回收率分别为73.6%和86.76%，可同时实现深度脱磷和铁元素高效回收。Abstract: In order to develop a P-removal agent for molten iron by using the sludge from the continuous casting swirl well to realize the resource utilization, the pre-dephosphorization agent with w(CaO): w(sludge) =0, 7%, 14%, 20%, 25% and 30% was prepared, and the melting performance measurement and P removal evaluation experiment were carried out based on the composition analysis and thermodynamic calculation. The results show that the sludge contains high quantity of (Fe2O3+FeO) and has an alkalinity of 0.86, and it is thermodynamically feasible as the base material for the preparation of pre-dephosphorization agent. With the increase of CaO from 0 to 30%, the melting point of the P-removal agent decreases first and then increases, and the melting rate rises first and then declines. When w(CaO): w(sludge) = 20%, the melting point of the P-removal agent is the lowest and the melting rate is the fastest. With the increase of CaO from 14% to 25%, the P removal rate first increases and then decreases, and the recovery rate of Fe gradually rises. Overall, when w(CaO): w(sludge)=20%, the removal rate of P and recovery rate of Fe are 73.6% and 86.76%, respectively, both deep removal of P and efficient ferrite recovery can be achieved at the same time.
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图 1 旋流井沉泥的微观形貌及微区成分分析
（a）沉泥的微观形貌；（b）为（a）中对应位置1的EDS谱图
Figure 1. Analysis of micromorphology and composition of sludge in continuous casting swirl wells
图 3 S1~S3渣剂的脱磷率和Fe回收率试验结果
Figure 3. Results of P removal and Fe recovery of S1-S3 slags
表 1 旋流井沉泥化学成分
Table 1. Chemical composition of sludge in continuous
% TFe MFe Fe2O3 FeO CaO SiO2 Al2O3 MnO Na2O K2O P2O5 C 62.20 0.61 36.38 46.49 4.69 5.46 1.29 0.94 0.82 0.19 0.045 0.63 
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表 2 部分氧化物的光学碱度[10]
Table 2. Optical alkalinity of some oxides
CaO Fe2O3 FeO SiO2 Al2O3 MnO Na2O K2O $ \mathit{\Lambda}_{\mathrm{B}} $ 1.00 0.48 0.51 0.48 0.60 0.59 1.15 1.40
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表 3 各组分摩尔分数
Table 3. Molar fraction of each component
CaO Fe2O3 FeO SiO2 Al2O3 MnO Na2O K2O $ x'_{\mathrm{B}} $ 0.077 0.208 0.593 0.084 0.012 0.012 0.012 0.002
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表 4 脱磷渣剂化学成分
Table 4. Chemical compositions of the pre-dephosphoriza
% 编号 w(CaO)：
w(沉泥)Fe2O3 FeO CaO SiO2 Al2O3 MnO Na2O K2O 1 0 37.79 48.3 4.87 5.67 1.34 0.98 0.85 0.2 2 7 35.23 45.02 11.32 5.28 1.25 0.91 0.79 0.18 3 14 33.00 42.16 16.96 4.95 1.17 0.85 0.74 0.17 4 20 31.29 39.99 21.24 4.70 1.11 0.81 0.70 0.16 5 25 30.01 38.34 24.48 4.51 1.06 0.77 0.68 0.15 6 30 28.81 36.84 27.47 4.32 1.02 0.74 0.65 0.15
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表 5 熔点和熔速测定试验结果
Table 5. Results of the melting point and melting velocity
编号 w(CaO)：
w(沉泥)/%软化温度
平均值/ ℃熔化温度
平均值/ ℃流动温度
平均值/ ℃熔化
速度/s1 0 1323.3 1352.3 1382.4 152.6 2 7 1223.0 1303.4 1321.0 117.6 3 14 1135.7 1195.1 1253.3 65.4 4 20 1128.2 1155.0 1216.4 30.6 5 25 1179.7 1222.2 1246.6 52.3 6 30 1231.3 1261.0 1302.6 95.3
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表 6 不同取样时间测得铁水中的P含量
Table 6. The P content in molten iron measured at different sampling time
编号 w[P]/% 脱磷率/% 0 min 3 min 5 min 10 min 15 min 20 min S1 0.413 0.165 0.123 0.118 0.109 0.115 72.2 S2 0.414 0.150 0.132 0.112 0.107 0.109 73.6 S3 0.412 0.153 0.115 0.104 0.105 0.112 72.8
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