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Gasification Behavior of Phosphorus during Pre-reduction Sintering of Medium-high Phosphorus Iron Ore

机译：中高磷铁矿矿前烧结过程中磷的气化行为

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摘要

The effects of dephosphorization agents (SiO_2, Na_2CO_3 and Al_2O_3) and reduction time on phosphorus gasification during pre-reduction sintering gasification dephosphorization were studied. The results indicate that the dephosphorization rate of apatite by carbothermal reduction is 23%, the dephosphorization rate of adding SiO_2 and Al_2O_3 is 25%, and the optimal dephosphorization rate is 36% by adding SiO_2 and Na_2CO_3. The dephosphorization rate increased from 13% to 31% with the reduction time increased from 20 min to 60 min. Thermodynamic analysis shows that the promotion effect of Na_2CO_3 on apatite reduction is stronger than that of Al_2O_3, and the thermodynamic conditions of apatite reduction are optimized to the greatest extent by adding SiO_2 and Na_2CO_3, with the starting temperature of carbothermal reduction of apatite decreased from 1 464°C to 746°C. P and C have the same variation and change trend, and the migration of phosphorus ito metallic iron is related to the carburizing reaction. The good heat storage of the sinter layer in pre-reduction sintering increases the time for maintaining the apatite reaction temperature and promotes the occurrence of dephosphorization reaction, however part of the phosphorus gas is absorbed by liquid metallic iron to form stable iron phosphorus compounds,which leads to the decrease of dephosphorization rate. Besides addition of dephosphorization agent, restricting migration of phosphorus into iron phase is the key point to increase gasification dephosphorization efficiency in sintering process.
机译：研究了脱磷试剂（SiO_2，Na_2CO_3和Al_2O_3）的影响，以及在预减少烧结气化脱磷期间的磷气化的磷气化。结果表明，磷灰石的脱磷速率通过碳热还原为23％，加入SiO_2和Al_2O_3的脱磷速率为25％，通过加入SiO_2和Na_2CO_3，最佳的脱磷率为36％。脱磷速率从13％增加到31％，还原时间从20分钟增加到60分钟。热力学分析表明，Na_2CO_3对磷灰石降低的促进效果比AL_2O_3的促进效果强，并且通过添加SiO_2和Na_2CO_3，最大程度地优化了磷灰石的热力学条件，其磷灰石的慢热量降低的起始温度降低1 464°C至746°C。 P和C具有相同的变化和变化趋势，磷ITO金属铁的迁移与渗碳反应有关。烧结层在预缩减烧结中的良好储存增加了保持磷灰石反应温度的时间并促进脱磷反应的发生，但是磷气的一部分被液体金属铁吸收以形成稳定的铁磷化合物，这是稳定的铁磷化合物导致脱磷率的降低。除了添加脱磷剂之外，将磷的迁移限制为铁相之外是增加气化脱磷效率在烧结过程中的关键点。

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