Effect of cation affinity properties of phosphorus on slag structure and phase separation in phosphorus ore smelting slags

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids Pub Date : 2025-05-15 DOI:10.1016/j.jnoncrysol.2025.123616

Zhibin Lu , Yu Wang , Jin Bai , Lingxue Kong , Huaizhu Li , Zhenxing Guo , Zongqing Bai , Wen Li

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Abstract

The structural properties of phosphorus are key factors influencing the reduction reaction rate in phosphate ore smelting slags. Nevertheless, investigations regarding the structural properties of phosphorus in phosphate ore smelting slags and their migration mechanisms remain undocumented. The present study revealed that phosphorus in slags containing 3–17 wt% P₂O₅ manifests distinct cationic affinity over the temperature range of 1100–1520 °C. This ionic selectivity drives liquid-liquid phase separation between phosphate-rich and silicate-dominated regions in the slag. Structural analysis of the NMR spectra reveals that with increasing P₂O₅ content from 3 wt% to 17 wt%, the polymerization degree of silicate structural units rises from 0.23 to 1.35 at 1520 °C, while that of aluminum structural units decreases from 3.36 to 2.57. Meanwhile, the polymerization degree of phosphate structural units increases from 0.35 to 0.48. During cooling, phosphorus migrates from bottom slag to top slag regions, concomitant with its enrichment from the silicate phase to the phosphate phase.

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磷的阳离子亲和性对磷矿冶炼渣中渣结构和相分离的影响

磷的结构性质是影响磷矿冶炼渣还原反应速率的关键因素。然而，关于磷矿冶炼渣中磷的结构性质及其迁移机制的研究仍然没有文献记载。本研究表明，在1100 ~ 1520℃的温度范围内，P2O5含量为3 ~ 17wt %的矿渣中的磷具有明显的阳离子亲和性。这种离子选择性驱动了渣中富磷酸盐区和硅酸盐区之间的液-液相分离。核磁共振结构分析表明，当P2O5含量从3 wt%增加到17 wt%时，在1520℃下，硅酸盐结构单元的聚合度从0.23上升到1.35，铝结构单元的聚合度从3.36下降到2.57。同时，磷酸盐结构单元的聚合度由0.35提高到0.48。在冷却过程中，磷从渣底区向渣顶区迁移，同时磷从硅酸盐相向磷酸盐相富集。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Non-crystalline Solids 工程技术-材料科学：硅酸盐

CiteScore

6.50

自引率

11.40%

发文量

576

审稿时长

35 days

期刊介绍： The Journal of Non-Crystalline Solids publishes review articles, research papers, and Letters to the Editor on amorphous and glassy materials, including inorganic, organic, polymeric, hybrid and metallic systems. Papers on partially glassy materials, such as glass-ceramics and glass-matrix composites, and papers involving the liquid state are also included in so far as the properties of the liquid are relevant for the formation of the solid. In all cases the papers must demonstrate both novelty and importance to the field, by way of significant advances in understanding or application of non-crystalline solids; in the case of Letters, a compelling case must also be made for expedited handling.