Influence of temperature on dephosphorization of recycling converter gasification dephosphorization slag
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摘要: 采用理论分析与试验验证相结合的方法，研究了转炉气化脱磷渣循环再利用时的脱磷能力。以焦粉还原转炉渣制备气化脱磷渣，理论分析不同还原温度对气化脱磷渣的磷容量和磷分配比的影响规律。由理论分析得知：随着还原温度的升高，经还原后的炉渣的磷容量和磷分配比均增加。在实验室中采用气化脱磷渣进行铁水脱磷热态试验，设温度为单变量，研究气化脱磷渣再利用时的脱磷效果，结果表明：转炉气化脱磷渣具有新的脱磷能力，反应前期脱磷效果显著。随着温度的增加，气化脱磷渣脱磷能力降低，脱磷速度变慢，符合热力学规律。Abstract: In this paper theoretical analysis and experimental verification are combined in order to study the dephosphorization ability of the converter gasification dephosphorization slag when it is recycled and reused. Gasification dephosphorization slag had been prepared by using coke powder to reduce converter slag. The influence of different reduction temperatures on the phosphorus capacity and phosphorus distribution ratio of gasification dephosphorization slag has been theoretically analyzed. According to theoretical analysis, with the increase of reduction temperature, the phosphorus capacity and phosphorus distribution ratio of the slag after reduction both increase. In the laboratory, gasification dephosphorization slag is used to conduct hot metal dephosphorization experiments, and a single temperature variable is set to study the dephosphorization effect of gasification dephosphorization slag when it is reused. The results show that converter gasification dephosphorization slag has new dephosphorization, significant dephosphorization effect during the early stage of the reaction. With the increase of temperature, the dephosphorization capacity of gasified dephosphorization slag decreases, and the dephosphorization speed becomes slower, which is in agreement with thermodynamics law.
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图 2 不同温度还原后炉渣磷容量变化
Figure 2. Changes of slag phosphorus capacity after reduction at different temperatures
图 3 不同温度还原后炉渣磷分配比变化
Figure 3. Changes of phosphorus distribution ratio after reduction at different temperatures
图 4 不同温度下铁水中磷含量随反应时间的变化
Figure 4. Change of phosphorus content with reaction time at different temperatures
图 5 不同温度下试验铁水的脱磷率
Figure 5. Dephosphorization rate of molten iron at different temperatures
表 1 转炉渣成分
Table 1. Compositions of converter slag
% FeO CaO SiO2 MgO MnO P2O5 S 其他 15.62 46.46 18.38 11.29 3.06 2.53 0.12 2.54 
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表 3 气化脱磷渣成分
Table 3. The compositions of gasification dephosphorization slag
% FeO CaO SiO2 MgO MnO P2O5 S 12.33 48.78 19.47 10.52 2.01 1.39 0.12
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表 5 不同反应时间铁水中P含量
Table 5. P content in hot metal with different reaction time
温度/℃wP/% 5 min 10 min 15 min 20 min 25 min 1350 0.079 0.055 0.053 0.051 0.050 1400 0.081 0.062 0.059 0.057 0.056 1450 0.081 0.063 0.060 0.058 0.056 1500 0.082 0.072 0.065 0.063 0.064
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