Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method for preparing alpha-semi-hydrated gypsum from phosphogypsum and product
The invention discloses a method for preparing alpha-semi-hydrated gypsum from phosphogypsum. The method comprises the following steps: obtaining pretreated phosphogypsum; mixing the pretreated phosphogypsum with water and a crystal modifier to form gypsum slurry; and treating the gypsum slurry in a semi-dry steam curing environment to obtain the alpha-semi-hydrated gypsum. Compared with a traditional autoclaving process, the method has the advantages that the energy consumption is reduced by 15-25%, and the conversion rate is greater than or equal to 95%. The 28d absolute dry compressive strength of the alpha-semi-hydrated gypsum product prepared by the method is greater than or equal to 50MPa, the breaking strength is greater than or equal to 7MPa, the standard consistency water consumption is 35-40%, and the seed crystal microstructure is a short hexagonal prism crystal with the length-diameter ratio close to 2: 1. According to the process, low energy consumption, high yield and high strength are achieved, and comprehensive utilization, high quality and large-scale engineering of the ardealite can be achieved.
本申请公开了一种磷石膏制备α‑半水石膏的方法。该方法包括：获得经预处理的磷石膏；将所述经预处理的磷石膏与水和转晶剂混合成石膏浆料；将所述石膏浆料置于半干蒸养环境中处理，得到α‑半水石膏。相较于传统蒸压工艺，该方法能耗降低15‑25％，转化率≥95％。采用该方法制备得到的α‑半水石膏产品28d绝干抗压强度≥50MPa，抗折强度≥7Mpa，标准稠度用水量在35％～40％，晶种微观形貌为长径比接近2:1的短六棱柱状晶体。本申请所述工艺实现低能耗、高产量、高强度，有助于实现磷石膏综合利用高质化、大规模工程化。
Method for preparing alpha-semi-hydrated gypsum from phosphogypsum and product
The invention discloses a method for preparing alpha-semi-hydrated gypsum from phosphogypsum. The method comprises the following steps: obtaining pretreated phosphogypsum; mixing the pretreated phosphogypsum with water and a crystal modifier to form gypsum slurry; and treating the gypsum slurry in a semi-dry steam curing environment to obtain the alpha-semi-hydrated gypsum. Compared with a traditional autoclaving process, the method has the advantages that the energy consumption is reduced by 15-25%, and the conversion rate is greater than or equal to 95%. The 28d absolute dry compressive strength of the alpha-semi-hydrated gypsum product prepared by the method is greater than or equal to 50MPa, the breaking strength is greater than or equal to 7MPa, the standard consistency water consumption is 35-40%, and the seed crystal microstructure is a short hexagonal prism crystal with the length-diameter ratio close to 2: 1. According to the process, low energy consumption, high yield and high strength are achieved, and comprehensive utilization, high quality and large-scale engineering of the ardealite can be achieved.
本申请公开了一种磷石膏制备α‑半水石膏的方法。该方法包括：获得经预处理的磷石膏；将所述经预处理的磷石膏与水和转晶剂混合成石膏浆料；将所述石膏浆料置于半干蒸养环境中处理，得到α‑半水石膏。相较于传统蒸压工艺，该方法能耗降低15‑25％，转化率≥95％。采用该方法制备得到的α‑半水石膏产品28d绝干抗压强度≥50MPa，抗折强度≥7Mpa，标准稠度用水量在35％～40％，晶种微观形貌为长径比接近2:1的短六棱柱状晶体。本申请所述工艺实现低能耗、高产量、高强度，有助于实现磷石膏综合利用高质化、大规模工程化。
Method for preparing alpha-semi-hydrated gypsum from phosphogypsum and product
一种磷石膏制备α-半水石膏的方法及产品
ZHANG HUALI (Autor:in) / MA LI (Autor:in) / CHEN LUYU (Autor:in) / WANG XIAOFENG (Autor:in)
29.08.2023
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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