Effect of Dephosphorization Agent on Gasification and Dephosphorization of High Phosphorus Iron Ore Pellets
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摘要: 高磷铁矿由于磷含量过高,限制其大规模开发利用。通过XRD衍射仪分析高磷铁矿中磷的赋存状态,并基于FactSage7.2热力学计算结果的基础,采用配料造球、球团焙烧等手段,探究不同脱磷剂SiO2和CaCl2对高磷铁矿球团气化脱磷的影响。结果表明:高磷铁矿中磷的存在形式为Ca5(PO4)3,加入脱磷剂后气化脱磷开始反应温度降低至815℃,在温度1 250℃,配碳5%的条件下,加入SiO2和CaCl2配比分别为0.8%、1.6%作为混合脱磷剂,气化脱磷效果最佳,脱磷率达22.1%。为高磷铁矿在球团焙烧过程中气化脱磷提供了新思路。Abstract: The development and utilization of high-phosphorus iron ore are restricted due to its high content of phosphorus.The occurrence state of phosphorus in high-phosphorous iron ores had been investigated by XRD diffraction.And based on the thermodynamic calculation results of FactSage7.2,the measures of pelletizing and pellet roasting had been carried out to explore the influence of different dephosphorization agents SiO2 and CaCl2 on the gasification and dephosphorization of high-phosphorous iron ores.The results showed that the phosphorus in high-phosphorous iron ores was in the form of Ca5（PO4）3.After adding dephosphorization agent,the reaction temperature of gasification and dephosphorization began to decrease to 815 ℃.Under the experimental conditions of 1 250 ℃ and 5% carbon,0.8% SiO2 and 1.6% CaCl2 were added as the mixed dephosphorization agent,the optimum gasification dephosphorization performance had been achieved withdephosphorization rate of 22.1%.
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Key words:
- high phosphorus ore /
- pellet /
- gasification dephosphorization /
- dephosphorization agent /
- roasting
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