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 under autoclaved condition
The invention discloses a method for preparing alpha semi-hydrated gypsum from phosphogypsum under an autoclaved condition. Under the conditions that the salt concentration is 10-20%, the pH value is7-8.5, the maleic anhydride content is 0.3-0.8%, the aluminum sulfate content is 0.2-0.5%, the constant temperature is 120-140 DEG C, and the time is 3-4 hours, the alpha semi-hydrated gypsum crystalwith the length-diameter ratio of 1: 1 and the particle size of 30-50 microns is prepared. The invention also provides a preparation method of the alpha semi-hydrated gypsum. The method compises the following steps: weighing a certain amount of phosphogypsum and fully washing; weighing required salt substances to prepare salt mixed solutions with various concentrations; and adding a crystal modifier and the washed phosphogypsum, fully stirring, adding a neutralizer to adjust the pH value to a proper interval, aging for 24 hours, putting into a still kettle, setting the temperature and pressure, quickly taking out from the still kettle after reaching the time, washing with hot water, filtering, and drying to obtain the alpha semi-hydrated gypsum. The invention relates to the method for preparing high-added-value alpha semi-hydrated gypsum from waste phosphogypsum, provides a new way for solving the problems of land occupation, environmental pollution and high-efficiency utilization of phosphogypsum stockpiling, and enhances the economic benefit and social benefit of enterprises.
本发明公开了一种蒸压条件下磷石膏制备α半水石膏的方法。在盐浓度10～20％、pH值7～8.5、顺丁烯二酸酐0.3～0.8％、硫酸铝0.2～0.5％、恒温120～140℃、时间3～4h条件下,制备得到长径比为1∶1的30～50μm的α半水石膏晶体。本发明还提供了上述α半水石膏制备方法：称取一定量磷石膏充分洗涤，称取所需盐类物质配制各浓度盐混合溶液，加入转晶剂及洗涤后的磷石膏一起充分搅拌，加入中和剂调节PH值在适当区间，陈化24h后放入蒸压釜内，设置温度及压力，到达时间后迅速从蒸压釜中取出，用热水洗涤、过滤、烘干即可制得α半水石膏。本发明是一种以废弃磷石膏制备高附加值α半水石膏的方法，为解决磷石膏堆存占用土地、污染环境问题及高效利用提供新的途径，提高企业经济效益和社会效益。
Method for preparing alpha semi-hydrated gypsum from phosphogypsum under autoclaved condition
The invention discloses a method for preparing alpha semi-hydrated gypsum from phosphogypsum under an autoclaved condition. Under the conditions that the salt concentration is 10-20%, the pH value is7-8.5, the maleic anhydride content is 0.3-0.8%, the aluminum sulfate content is 0.2-0.5%, the constant temperature is 120-140 DEG C, and the time is 3-4 hours, the alpha semi-hydrated gypsum crystalwith the length-diameter ratio of 1: 1 and the particle size of 30-50 microns is prepared. The invention also provides a preparation method of the alpha semi-hydrated gypsum. The method compises the following steps: weighing a certain amount of phosphogypsum and fully washing; weighing required salt substances to prepare salt mixed solutions with various concentrations; and adding a crystal modifier and the washed phosphogypsum, fully stirring, adding a neutralizer to adjust the pH value to a proper interval, aging for 24 hours, putting into a still kettle, setting the temperature and pressure, quickly taking out from the still kettle after reaching the time, washing with hot water, filtering, and drying to obtain the alpha semi-hydrated gypsum. The invention relates to the method for preparing high-added-value alpha semi-hydrated gypsum from waste phosphogypsum, provides a new way for solving the problems of land occupation, environmental pollution and high-efficiency utilization of phosphogypsum stockpiling, and enhances the economic benefit and social benefit of enterprises.
本发明公开了一种蒸压条件下磷石膏制备α半水石膏的方法。在盐浓度10～20％、pH值7～8.5、顺丁烯二酸酐0.3～0.8％、硫酸铝0.2～0.5％、恒温120～140℃、时间3～4h条件下,制备得到长径比为1∶1的30～50μm的α半水石膏晶体。本发明还提供了上述α半水石膏制备方法：称取一定量磷石膏充分洗涤，称取所需盐类物质配制各浓度盐混合溶液，加入转晶剂及洗涤后的磷石膏一起充分搅拌，加入中和剂调节PH值在适当区间，陈化24h后放入蒸压釜内，设置温度及压力，到达时间后迅速从蒸压釜中取出，用热水洗涤、过滤、烘干即可制得α半水石膏。本发明是一种以废弃磷石膏制备高附加值α半水石膏的方法，为解决磷石膏堆存占用土地、污染环境问题及高效利用提供新的途径，提高企业经济效益和社会效益。
Method for preparing alpha semi-hydrated gypsum from phosphogypsum under autoclaved condition
一种蒸压条件下磷石膏制备α半水石膏的方法
WEI JIAZHAN (Autor:in) / CHEN PING (Autor:in) / LIU RONGJIN (Autor:in) / DUAN PENGXUAN (Autor:in) / ZHAO YANRONG (Autor:in)
11.08.2020
Patent
Elektronische Ressource
Chinesisch
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