{"title":"氟化钠对二水硫酸钙和磷石膏制备高强度 α- 半水石膏晶体调节的影响","authors":"Xiaohong Ru, Hua Zhang, Yujiang Wang, Zhenzhen Zhi, Yanfei Guo, Keke Zhang, Longhui He","doi":"10.1007/s10163-024-01972-0","DOIUrl":null,"url":null,"abstract":"<div><p>The presence of impurities from raw materials directly affects the crystal shape control, process, and product performance of high-strength α-hemihydrate gypsum (α-HH,α-CaSO<sub>4</sub>•0.5H<sub>2</sub>O) from industrial by-product phosphogypsum (PG). In this work, effect of sodium fluoride on the crystal regulation of high-strength α-HH using calcium sulphate dihydrate(DH,CaSO<sub>4</sub>•2H<sub>2</sub>O) and PG as raw materials were investigated, respectively. The results showed that 0.6–1.8 wt% sodium fluoride can transform some α-HH crystals from fine needle shape to aggregate plate shape by changing the crystallinity, crystal habit and crystal diameter of α-HH. In the presence of 0.1 wt% citric acid and 0.6–1.8 wt% sodium fluoride, short hexagon-prism α-HH crystals can be obtained from DH or PG, sodium fluoride improved the content of α-HH in dehydration products, altered the dehydration and phase transition peak temperatures, transformed the crystallinity and crystal growth habit along the c-axis by the selectively chemisorption of F<sup>−</sup>, Na<sup>+</sup> and citrate ions on the end surface of α-HH. With 0.1 wt% citric acid and 1.8 wt% sodium fluoride addition, the compressive strength of α-HH from DH and PG reached 59.8 MPa and 54 MPa, respectively, which were 54.3 MPa and 54.0 MPa higher than the blank samples.</p></div>","PeriodicalId":643,"journal":{"name":"Journal of Material Cycles and Waste Management","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of sodium fluoride on the crystal regulation of high-strength α-hemihydrate gypsum from calcium sulphate dihydrate and phosphogypsum\",\"authors\":\"Xiaohong Ru, Hua Zhang, Yujiang Wang, Zhenzhen Zhi, Yanfei Guo, Keke Zhang, Longhui He\",\"doi\":\"10.1007/s10163-024-01972-0\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The presence of impurities from raw materials directly affects the crystal shape control, process, and product performance of high-strength α-hemihydrate gypsum (α-HH,α-CaSO<sub>4</sub>•0.5H<sub>2</sub>O) from industrial by-product phosphogypsum (PG). In this work, effect of sodium fluoride on the crystal regulation of high-strength α-HH using calcium sulphate dihydrate(DH,CaSO<sub>4</sub>•2H<sub>2</sub>O) and PG as raw materials were investigated, respectively. The results showed that 0.6–1.8 wt% sodium fluoride can transform some α-HH crystals from fine needle shape to aggregate plate shape by changing the crystallinity, crystal habit and crystal diameter of α-HH. In the presence of 0.1 wt% citric acid and 0.6–1.8 wt% sodium fluoride, short hexagon-prism α-HH crystals can be obtained from DH or PG, sodium fluoride improved the content of α-HH in dehydration products, altered the dehydration and phase transition peak temperatures, transformed the crystallinity and crystal growth habit along the c-axis by the selectively chemisorption of F<sup>−</sup>, Na<sup>+</sup> and citrate ions on the end surface of α-HH. With 0.1 wt% citric acid and 1.8 wt% sodium fluoride addition, the compressive strength of α-HH from DH and PG reached 59.8 MPa and 54 MPa, respectively, which were 54.3 MPa and 54.0 MPa higher than the blank samples.</p></div>\",\"PeriodicalId\":643,\"journal\":{\"name\":\"Journal of Material Cycles and Waste Management\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.7000,\"publicationDate\":\"2024-05-15\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Material Cycles and Waste Management\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s10163-024-01972-0\",\"RegionNum\":4,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENVIRONMENTAL SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Material Cycles and Waste Management","FirstCategoryId":"93","ListUrlMain":"https://link.springer.com/article/10.1007/s10163-024-01972-0","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
Effect of sodium fluoride on the crystal regulation of high-strength α-hemihydrate gypsum from calcium sulphate dihydrate and phosphogypsum
The presence of impurities from raw materials directly affects the crystal shape control, process, and product performance of high-strength α-hemihydrate gypsum (α-HH,α-CaSO4•0.5H2O) from industrial by-product phosphogypsum (PG). In this work, effect of sodium fluoride on the crystal regulation of high-strength α-HH using calcium sulphate dihydrate(DH,CaSO4•2H2O) and PG as raw materials were investigated, respectively. The results showed that 0.6–1.8 wt% sodium fluoride can transform some α-HH crystals from fine needle shape to aggregate plate shape by changing the crystallinity, crystal habit and crystal diameter of α-HH. In the presence of 0.1 wt% citric acid and 0.6–1.8 wt% sodium fluoride, short hexagon-prism α-HH crystals can be obtained from DH or PG, sodium fluoride improved the content of α-HH in dehydration products, altered the dehydration and phase transition peak temperatures, transformed the crystallinity and crystal growth habit along the c-axis by the selectively chemisorption of F−, Na+ and citrate ions on the end surface of α-HH. With 0.1 wt% citric acid and 1.8 wt% sodium fluoride addition, the compressive strength of α-HH from DH and PG reached 59.8 MPa and 54 MPa, respectively, which were 54.3 MPa and 54.0 MPa higher than the blank samples.
期刊介绍:
The Journal of Material Cycles and Waste Management has a twofold focus: research in technical, political, and environmental problems of material cycles and waste management; and information that contributes to the development of an interdisciplinary science of material cycles and waste management. Its aim is to develop solutions and prescriptions for material cycles.
The journal publishes original articles, reviews, and invited papers from a wide range of disciplines related to material cycles and waste management.
The journal is published in cooperation with the Japan Society of Material Cycles and Waste Management (JSMCWM) and the Korea Society of Waste Management (KSWM).