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Method for preparing high-strength gypsum from phosphogypsum
The invention belongs to the technical field of chemical production, and particularly relates to a method for preparing high-strength gypsum from ardealite. The phosphogypsum is subjected to primary drying and then is divided into two parts, and the first part is calcined to prepare anhydrous gypsum; adding a regulator and a crystal medium into the second part, putting the mixture into a crystal transformation box, reacting for 6-10 hours at the reaction temperature of 110-140 DEG C, dehydrating after the reaction is completed, and then drying for the second time at the temperature of 60-100 DEG C until the moisture content is 5-7%, so as to prepare alpha-beta composite semi-hydrated gypsum; respectively grinding the obtained anhydrous gypsum and alpha-beta composite semi-hydrated gypsum, and mixing to obtain the high-strength gypsum. The gypsum prepared by the method disclosed by the invention meets all process requirements of the high-strength gypsum, namely the initial setting time is not earlier than 3min, the final setting time is not later than 30min, the 2h breaking strength is greater than or equal to 3.5 MPa, and the drying compressive strength is greater than or equal to 25MPa.
本发明属于化工生产技术领域，具体涉及一种由磷石膏制备高强石膏的方法。将磷石膏一次干燥后分为两部分，第一部分进行煅烧后制得无水石膏；第二部分加入调整剂和晶媒介，置于转晶箱内在反应温度为110℃‑140℃的条件下反应6‑10h，反应完成后先进行脱水，再在60‑100℃下二次干燥至水分含量为5％‑7％，制得α‑β复合半水石膏；将所得的无水石膏和α‑β复合半水石膏分别粉磨后混合即得高强石膏；通过本发明的方法制备的石膏满足高强石膏的所有工艺要求，即初凝时间不早于3min，终凝时间不迟于30min，2h抗折强度≥3.5MPa,烘干抗压强度≥25MPa。
Method for preparing high-strength gypsum from phosphogypsum
The invention belongs to the technical field of chemical production, and particularly relates to a method for preparing high-strength gypsum from ardealite. The phosphogypsum is subjected to primary drying and then is divided into two parts, and the first part is calcined to prepare anhydrous gypsum; adding a regulator and a crystal medium into the second part, putting the mixture into a crystal transformation box, reacting for 6-10 hours at the reaction temperature of 110-140 DEG C, dehydrating after the reaction is completed, and then drying for the second time at the temperature of 60-100 DEG C until the moisture content is 5-7%, so as to prepare alpha-beta composite semi-hydrated gypsum; respectively grinding the obtained anhydrous gypsum and alpha-beta composite semi-hydrated gypsum, and mixing to obtain the high-strength gypsum. The gypsum prepared by the method disclosed by the invention meets all process requirements of the high-strength gypsum, namely the initial setting time is not earlier than 3min, the final setting time is not later than 30min, the 2h breaking strength is greater than or equal to 3.5 MPa, and the drying compressive strength is greater than or equal to 25MPa.
本发明属于化工生产技术领域，具体涉及一种由磷石膏制备高强石膏的方法。将磷石膏一次干燥后分为两部分，第一部分进行煅烧后制得无水石膏；第二部分加入调整剂和晶媒介，置于转晶箱内在反应温度为110℃‑140℃的条件下反应6‑10h，反应完成后先进行脱水，再在60‑100℃下二次干燥至水分含量为5％‑7％，制得α‑β复合半水石膏；将所得的无水石膏和α‑β复合半水石膏分别粉磨后混合即得高强石膏；通过本发明的方法制备的石膏满足高强石膏的所有工艺要求，即初凝时间不早于3min，终凝时间不迟于30min，2h抗折强度≥3.5MPa,烘干抗压强度≥25MPa。
Method for preparing high-strength gypsum from phosphogypsum
一种由磷石膏制备高强石膏的方法
SU YU (author) / ZHOU RONGCHAO (author) / PENG QIMING (author)
2022-05-27
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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