Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Alpha-semi-hydrated gypsum and preparation method thereof
The invention provides alpha-semi-hydrated gypsum and a preparation method thereof. According to the preparation method of the alpha-semi-hydrated gypsum, preliminary dissolution of the dihydrate phosphogypsum is promoted in an acid solution environment at a relatively low temperature (60-90 DEG C), impurities such as organic matters adsorbed on the surface of the phosphogypsum can be removed, then the reaction temperature (95-110 DEG C) and the acidity are improved, and the crystal modifier is added, so that the crystal transformation reaction is promoted and the morphology is effectively controlled. Besides, the process conditions of the method can be matched with the existing dihydrate process, the dihydrate phosphogypsum produced by the dihydrate process is mixed with phosphoric acid, and a crystal modifier is added, so that the dihydrate phosphogypsum is converted into a high-strength alpha-semi-hydrated phosphogypsum crystal with short columnar morphology, and meanwhile, residual phosphorus in the dihydrate phosphogypsum can be recycled, so that the method is suitable for industrial production. Filtrate and washing water after crystal transformation are recycled, and the method has the advantages of low energy consumption, wide applicability and less pollution.
本发明提供了一种α‑半水石膏及其制备方法。本发明的α‑半水石膏的制备方法，通过在较低温度(60～90℃)的酸液环境下促进二水磷石膏的初步溶解，可以除去磷石膏表面吸附的有机质等杂质，之后再提高反应温度(95～110℃)和酸度并加入转晶剂，促进转晶反应的进行以及形貌的有效控制。此外，该方法的工艺条件能够与现有的二水法工艺相匹配，通过将二水法生产得到的二水磷石膏与磷酸混浆并添加转晶剂，使其转化成具有短柱状形貌的高强α‑半水磷石膏晶体，同时能够回收利用二水磷石膏中的残留磷，循环利用转晶后的滤液和洗涤水，具有能耗低、适用性广、污染少的优点。
Alpha-semi-hydrated gypsum and preparation method thereof
The invention provides alpha-semi-hydrated gypsum and a preparation method thereof. According to the preparation method of the alpha-semi-hydrated gypsum, preliminary dissolution of the dihydrate phosphogypsum is promoted in an acid solution environment at a relatively low temperature (60-90 DEG C), impurities such as organic matters adsorbed on the surface of the phosphogypsum can be removed, then the reaction temperature (95-110 DEG C) and the acidity are improved, and the crystal modifier is added, so that the crystal transformation reaction is promoted and the morphology is effectively controlled. Besides, the process conditions of the method can be matched with the existing dihydrate process, the dihydrate phosphogypsum produced by the dihydrate process is mixed with phosphoric acid, and a crystal modifier is added, so that the dihydrate phosphogypsum is converted into a high-strength alpha-semi-hydrated phosphogypsum crystal with short columnar morphology, and meanwhile, residual phosphorus in the dihydrate phosphogypsum can be recycled, so that the method is suitable for industrial production. Filtrate and washing water after crystal transformation are recycled, and the method has the advantages of low energy consumption, wide applicability and less pollution.
本发明提供了一种α‑半水石膏及其制备方法。本发明的α‑半水石膏的制备方法，通过在较低温度(60～90℃)的酸液环境下促进二水磷石膏的初步溶解，可以除去磷石膏表面吸附的有机质等杂质，之后再提高反应温度(95～110℃)和酸度并加入转晶剂，促进转晶反应的进行以及形貌的有效控制。此外，该方法的工艺条件能够与现有的二水法工艺相匹配，通过将二水法生产得到的二水磷石膏与磷酸混浆并添加转晶剂，使其转化成具有短柱状形貌的高强α‑半水磷石膏晶体，同时能够回收利用二水磷石膏中的残留磷，循环利用转晶后的滤液和洗涤水，具有能耗低、适用性广、污染少的优点。
Alpha-semi-hydrated gypsum and preparation method thereof
一种α-半水石膏及其制备方法
WU RUIZHE (Autor:in) / WU SHENG (Autor:in) / TANG HONGPING (Autor:in) / WANG BIN (Autor:in)
09.08.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
Alpha semi-hydrated gypsum and preparation method thereof
| Europäisches Patentamt | 2024
Method for preparing alpha-semi-hydrated gypsum through beta-semi-hydrated gypsum recrystallization
| Europäisches Patentamt | 2016
| Europäisches Patentamt | 2020
Preparation method of nano alpha-semi-hydrated gypsum material
| Europäisches Patentamt | 2022
Preparation method of alpha-beta composite semi-hydrated gypsum
| Europäisches Patentamt | 2022