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Method for directly preparing anhydrous gypsum from phosphogypsum
The invention discloses a method for directly preparing anhydrite by using phosphogypsum, which comprises the following steps: mixing an acid solution or an acid solution containing metal ions with phosphogypsum to prepare a suspension with the solid content of 0.01-0.1 g/mL, stirring at normal pressure and at 86-120 DEG C, carrying out crystal transformation reaction, after the reaction is completed, carrying out solid-liquid separation, washing the solid with hot water and absolute ethyl alcohol in sequence, and drying to obtain the anhydrite. The mass concentration of sulfuric acid in the acid solution containing the metal ions is 1-7%, the mass concentration of phosphoric acid in terms of phosphorus pentoxide is 30-50%, and the concentration of the metal ions is 0.01-0.1 mol/L; the method does not need any pretreatment such as desulfurization and impurity removal, does not need calcination, is mild in reaction condition and simple to operate, can realize large-scale recycling of the ardealite, and is suitable for industrial production and market popularization and application.
本发明公开了一种利用磷石膏直接制备无水石膏的方法，该方法是将酸溶液或含金属离子的酸溶液与磷石膏混合制得固含量0.01~0.1g/mL的悬浊液，在常压、搅拌、86~120℃下进行转晶反应，反应完成后，固液分离，固体依次用热水、无水乙醇洗涤后，干燥制得无水石膏，其中含金属离子的酸溶液中硫酸的质量浓度是1~7%，以五氧化二磷计磷酸的质量浓度为30~50%，金属离子浓度为0.01~0.1mol/L；本发明不经过脱硫、去除杂质等任何预处理，无需煅烧，反应条件温和、操作简单，本发明方法能实现磷石膏的大批量资源化，适用于工业化生产和市场推广应用。
Method for directly preparing anhydrous gypsum from phosphogypsum
The invention discloses a method for directly preparing anhydrite by using phosphogypsum, which comprises the following steps: mixing an acid solution or an acid solution containing metal ions with phosphogypsum to prepare a suspension with the solid content of 0.01-0.1 g/mL, stirring at normal pressure and at 86-120 DEG C, carrying out crystal transformation reaction, after the reaction is completed, carrying out solid-liquid separation, washing the solid with hot water and absolute ethyl alcohol in sequence, and drying to obtain the anhydrite. The mass concentration of sulfuric acid in the acid solution containing the metal ions is 1-7%, the mass concentration of phosphoric acid in terms of phosphorus pentoxide is 30-50%, and the concentration of the metal ions is 0.01-0.1 mol/L; the method does not need any pretreatment such as desulfurization and impurity removal, does not need calcination, is mild in reaction condition and simple to operate, can realize large-scale recycling of the ardealite, and is suitable for industrial production and market popularization and application.
本发明公开了一种利用磷石膏直接制备无水石膏的方法，该方法是将酸溶液或含金属离子的酸溶液与磷石膏混合制得固含量0.01~0.1g/mL的悬浊液，在常压、搅拌、86~120℃下进行转晶反应，反应完成后，固液分离，固体依次用热水、无水乙醇洗涤后，干燥制得无水石膏，其中含金属离子的酸溶液中硫酸的质量浓度是1~7%，以五氧化二磷计磷酸的质量浓度为30~50%，金属离子浓度为0.01~0.1mol/L；本发明不经过脱硫、去除杂质等任何预处理，无需煅烧，反应条件温和、操作简单，本发明方法能实现磷石膏的大批量资源化，适用于工业化生产和市场推广应用。
Method for directly preparing anhydrous gypsum from phosphogypsum
一种利用磷石膏直接制备无水石膏的方法
MA LIPING (author) / XIONG XIONG (author) / YIN XIA (author) / HOU PEIXIN (author) / LI JIAWEI (author) / LI KAI (author)
2023-02-28
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
/
C01F
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
,
Verbindungen der Metalle Beryllium, Magnesium, Aluminium, Calcium, Strontium, Barium, Radium, Thorium oder der Seltenen Erden
/
C30B
SINGLE-CRYSTAL GROWTH
,
Züchten von Einkristallen
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