低温煅烧法制备磷硬石膏Ⅱ过程中氟磷杂质的转化机理

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-04-13 DOI:10.1016/j.conbuildmat.2025.141176

Lu Zeng , Wenting Wang , Jiayang Zhu , Shuping Wang , Jianxin Zhang

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引用次数: 0

摘要

对于磷石膏的大规模利用而言，减少氟和磷杂质对其下游产品的影响是一个亟待解决的关键问题。本文在作者前期研究的基础上，进一步研究了 H2SO4 在 120、200、280 和 360℃ 温度下对磷石膏相组成和形态的影响。并深入探讨了 H2SO4 对低温煅烧法获得的磷-无水石膏 II 中氟和磷杂质的影响及转化机理。结果表明，低温煅烧能有效去除磷-无水石膏 II 中的氟杂质和磷杂质，尤其是共晶磷。此外，浸出 pH 值的变化表明，在低温煅烧过程中，可溶性磷杂质可转化为不溶性惰性物质。该研究不仅实现了在低于 400℃ 的温度下制备磷-无水石膏 II，还有效地减轻了氟和磷杂质的不利影响。

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Conversion mechanisms of fluorine and phosphorus impurities during the preparation of phosphorus-anhydrite Ⅱ via low-temperature calcination method

For the large-scale utilization of phosphogypsum, reducing the impact of fluorine and phosphorus impurities on its downstream products is a critical issue that urgently requires resolution. Based on the author’s previous study, this paper further investigated the effects of H₂SO₄ on the phase composition and morphology of phosphogypsum at temperatures of 120, 200, 280, and 360℃. And the effect and conversion mechanism of H₂SO₄ on fluorine and phosphorus impurities in phosphorus-anhydrite II obtained through low-temperature calcination method were thoroughly discussed. The results demonstrated that the low-temperature calcination effectively remove fluorine impurities and phosphorus impurities in phosphorus-anhydrite II, particularly for eutectic phosphorus. Additionally, leaching pH variations indicated that the soluble phosphorus impurities could be converted into insoluble inert substances under low-temperature calcination. This study not only achieved the preparation of phosphorus-anhydrite II at temperature below 400℃, but also effectively mitigated the adverse effect of fluorine and phosphorus impurities.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.