To achieve low‐cost clean production in steelmaking plants, a low‐carbon double slag converter steelmaking process (LCDSP) with high dephosphorization efficiency, low lime consumption, and low CO2 emissions is focused on. The average lime consumption in LCDSP has decreased about 25.8%, which can reduce at least about 10.3 million m3 CO2 emissions per converter per year in the current steelmaking plant. The phosphorus enrichment properties of decarbonization slag with different basicities are comprehensively evaluated through LCDSP industrial experiments, mineralogy, and ion–molecule coexistence theory (IMCT). The increase of decarburization slag basicity (DSB) significantly improves the dephosphorization efficiency of molten steel. With increasing the DSB from 2.93 to 3.52, the typical morphology of the P‐rich phase extends from small pieces to long strips and then changes to block shapes with smooth edges. Finally, it forms a massive P‐rich phase with an area of more than 10 000 μm2 with a DSB of 3.80. The phosphorus enrichment properties of decarbonization slag with different DSBs evaluated using multiple perspectives show a consistent change trend. IMCT provides an accurate thermodynamic method for quantitatively predicting the phosphorus enrichment capacity in slag in two stages of LCDSP.

中文翻译：

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基于工业实验、矿物学和离子分子共存理论研究低碳双渣转炉炼钢过程中碱度对脱碳渣富磷性能的影响

为实现炼钢厂低成本清洁生产，脱磷效率高、石灰消耗低、CO2低的低碳双渣转炉炼钢工艺（LCDSP）2排放是重点。 LCDSP平均石灰消耗量下降约25.8%，至少可减少约1030万立方米3一氧化碳2当前炼钢厂每台转炉每年的排放量。通过LCDSP工业实验、矿物学和离子分子共存理论（IMCT）综合评价不同碱度脱碳渣的富磷特性。脱碳渣碱度（DSB）的提高显着提高了钢水的脱磷效率。随着 DSB 从 2.93 增加到 3.52，富磷相的典型形貌从小片延伸到长条，然后转变为边缘光滑的块状。最终形成面积超过10 000 μm的块状富P相2DSB 为 3.80。多角度评价不同DSB脱碳渣磷富集特性表现出一致的变化趋势。 IMCT为定量预测LCDSP两阶段炉渣中磷的富集能力提供了精确的热力学方法。