A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Preparation of α-hemihydrate gypsum whiskers from phosphogypsum using atmospheric pressure nitrate solution
https://orcid.org/0000-0002-4088-7617
Abstract A substantial stockpile of phosphogypsum (PG) not just consumes land resources, but also poses environmental contamination risks. Herein, the conversion of PG into high-value α-hemihydrate gypsum (α-HH) whisker by the atmospheric pressure salt solution method with simple process, high efficiency and low energy consumption was investigated. Sodium nitrate was found to accelerate the conversion of PG into α-HH, and sorbitol could modify the α-HH into rod-like morphology with high aspect ratios. The α-HH whiskers with an average length of 96.28 µm and an average aspect ratio of 25.47 were prepared within 1.5 h under the optimal parameters of 80 ℃, sodium nitrate-30 wt%, PG-12 wt%, and sorbitol-1 wt%. The modulation mechanism was that hydroxyl groups in sorbitol formed strong hydrogen bonds with the sulfate groups on the lateral of the crystals, which promoted the growth of α-HH along the c-axis. Moreover, the filtrate could be effectively recycled by adding salt medium and crystallization modifier. Such technique provides a theoretical basis for the high-value utilization of PG.
Graphical Abstract Display Omitted
Highlights α-HH whisker was prepared in chloride-free salt solution system. Sorbitol containing polyhydroxyl facilitate the rapid generation of α-HH whisker with high aspect ratio. Salt medium was efficiently recycled, avoiding the environmental hazards. Guiding the α-HH whisker preparation via green and convenient method.
Preparation of α-hemihydrate gypsum whiskers from phosphogypsum using atmospheric pressure nitrate solution
https://orcid.org/0000-0002-4088-7617
Abstract A substantial stockpile of phosphogypsum (PG) not just consumes land resources, but also poses environmental contamination risks. Herein, the conversion of PG into high-value α-hemihydrate gypsum (α-HH) whisker by the atmospheric pressure salt solution method with simple process, high efficiency and low energy consumption was investigated. Sodium nitrate was found to accelerate the conversion of PG into α-HH, and sorbitol could modify the α-HH into rod-like morphology with high aspect ratios. The α-HH whiskers with an average length of 96.28 µm and an average aspect ratio of 25.47 were prepared within 1.5 h under the optimal parameters of 80 ℃, sodium nitrate-30 wt%, PG-12 wt%, and sorbitol-1 wt%. The modulation mechanism was that hydroxyl groups in sorbitol formed strong hydrogen bonds with the sulfate groups on the lateral of the crystals, which promoted the growth of α-HH along the c-axis. Moreover, the filtrate could be effectively recycled by adding salt medium and crystallization modifier. Such technique provides a theoretical basis for the high-value utilization of PG.
Graphical Abstract Display Omitted
Highlights α-HH whisker was prepared in chloride-free salt solution system. Sorbitol containing polyhydroxyl facilitate the rapid generation of α-HH whisker with high aspect ratio. Salt medium was efficiently recycled, avoiding the environmental hazards. Guiding the α-HH whisker preparation via green and convenient method.
Preparation of α-hemihydrate gypsum whiskers from phosphogypsum using atmospheric pressure nitrate solution
https://orcid.org/0000-0002-4088-7617
Abstract A substantial stockpile of phosphogypsum (PG) not just consumes land resources, but also poses environmental contamination risks. Herein, the conversion of PG into high-value α-hemihydrate gypsum (α-HH) whisker by the atmospheric pressure salt solution method with simple process, high efficiency and low energy consumption was investigated. Sodium nitrate was found to accelerate the conversion of PG into α-HH, and sorbitol could modify the α-HH into rod-like morphology with high aspect ratios. The α-HH whiskers with an average length of 96.28 µm and an average aspect ratio of 25.47 were prepared within 1.5 h under the optimal parameters of 80 ℃, sodium nitrate-30 wt%, PG-12 wt%, and sorbitol-1 wt%. The modulation mechanism was that hydroxyl groups in sorbitol formed strong hydrogen bonds with the sulfate groups on the lateral of the crystals, which promoted the growth of α-HH along the c-axis. Moreover, the filtrate could be effectively recycled by adding salt medium and crystallization modifier. Such technique provides a theoretical basis for the high-value utilization of PG.
Graphical Abstract Display Omitted
Highlights α-HH whisker was prepared in chloride-free salt solution system. Sorbitol containing polyhydroxyl facilitate the rapid generation of α-HH whisker with high aspect ratio. Salt medium was efficiently recycled, avoiding the environmental hazards. Guiding the α-HH whisker preparation via green and convenient method.
Preparation of α-hemihydrate gypsum whiskers from phosphogypsum using atmospheric pressure nitrate solution
Xia, Baolin (author) / Shi, Ruohan (author) / Wang, Wei (author) / Peng, Weijun (author) / Cao, Yijun (author) / Huang, Yukun (author) / Fan, Guixia (author)
2024-01-02
Article (Journal)
Electronic Resource
English
Influence of crystal modifier on the preparation of α-hemihydrate gypsum from phosphogypsum
| British Library Online Contents | 2017
Influence of crystal modifier on the preparation of [alpha]-hemihydrate gypsum from phosphogypsum
| Online Contents | 2017