| 陈国夫,马静月,蒲桃红,李柱凯.氧化钙高温改性磷石膏对水泥基胶凝材料性能的影响研究*[J].水泥工程,2024,37(1):93-96 |
| 氧化钙高温改性磷石膏对水泥基胶凝材料性能的影响研究* |
| Study on the properties of high temperature modified phosphogypsum with calcium oxide on cement based cementitious materials |
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| DOI： |
| 中文关键词: 氧化钙,磷石膏,高温改性,水泥胶砂 |
| 英文关键词: calcium oxide, phosphogypsum, high temperature modification, cement mortar |
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| 摘要点击次数: 14 |
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| 中文摘要: |
| 磷石膏是磷化工产业过程中产生的固体废弃物，其主要成分为CaSO4 ·2H2O，具有产量大、组分复杂等特征，阻碍了其在胶凝材料中的应用。本研究利用氧化钙的碱性来去除磷石膏中的酸性杂质，探究氧化钙改性磷石膏的机理，对磷石膏水泥基胶凝材料的物理性能进行考察，结合SEM分析胶凝材料水化产物情况。结果表明：氧化钙能够消除磷石膏中的酸性杂质，减弱其对二水石膏晶体定向生长的抑制作用；掺入氧化钙后胶凝材料的安定性合格，初凝时间和终凝时间均下降；氧化钙的掺入有利于水泥基胶凝材料强度的发展，最佳的氧化钙掺量为2%；SEM结果显示，氧化钙消除了杂质的抑制作用，水化作用增强，层状的二水石膏晶体出现，有利于胶凝材料强度的发展。 |
| 英文摘要: |
| Phosphogypsum is a solid waste generated in the phosphorus chemical industry, mainly composed of CaSO4 · 2H2O. It has the characteristics of high yield and complex composition, which hinders its application in cementitious materials. This study utilizes the alkalinity of calcium oxide to remove acidic impurities from phosphogypsum, explores the mechanism of calcium oxide modified phosphogypsum, investigates the physical properties of phosphogypsum cementitious materials, and analyzes the hydration products of the cementitious materials using SEM. The results show that calcium oxide can eliminate acidic impurities in phosphogypsum and weaken its inhibitory effect on the directional growth of dihydrate gypsum crystals; After adding calcium oxide, the stability of the cementitious material is qualified, and the initial and final setting times both decrease; The addition of calcium oxide is beneficial for the development of the strength of cementitious materials, and the optimal amount of calcium oxide is 2%; The SEM results show that calcium oxide eliminates the inhibitory effect of impurities, enhances hydration, and forms layered dihydrate gypsum crystals, which is beneficial for the development of the strength of cementitious materials. |
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