Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Phosphogypsum pretreatment and purification method
The invention discloses a phosphogypsum pretreatment and purification method, belonging to the technical field of phosphogypsum purification. The method comprises the following steps: washing slag discharged from a wet-process phosphoric acid production line with washing water for washing phosphogypsum and a filtrate in a slag hopper, and conducting repulping; pumping the repulped slurry into a slurry distribution box of a belt filter for uniform distribution; dehydrating the slurry, and then carrying out countercurrent washing twice; drying the washed phosphogypsum with a desiccant, and conducting blowing; and sending a filtrate obtained after repulping to a phosphoric acid production system for use. The phosphogypsum having been subjected to dehydration, washing and blowing has a water-soluble phosphorus content of less than or equal to 0.05%, a water-soluble fluorine content of less than or equal to 0.03%, a pH value of greater than or equal to 5 and a water content of less than orequal to 23%. The treated phosphogypsum can directly enter a building gypsum production area, so the stockpiling time is greatly shortened, the volume occupation of a slag bin is reduced, and the service life of the slag bin is favorably prolonged. The filtrate returns to a phosphoric acid production system for use, so the recovery rate of phosphorus is increased, and production consumption of phosphoric acid is reduced.
本发明公开了一种磷石膏预处理净化方法，涉及磷石膏净化技术领域。将从湿法磷酸生产线上卸下的渣在渣斗内用洗涤磷石膏的洗水和滤液冲洗再浆；再浆后的料浆经泵送至带式过滤机的料浆分布箱中均匀布料；料浆先进行脱水，再经过两次逆流洗涤；洗涤后的磷石膏经吸干后喷吹；再浆后的滤液送至磷酸生产系统使用。经脱水洗涤喷吹后的磷石膏水溶磷≤0.05％、水溶性氟≤0.03％，pH≥5，含水量≤23％。处理后的磷石膏可直接进入到建筑石膏生产区域，大幅降低堆存时间，减少渣库的容积占用，有利于延长渣库的服务年限。滤液返回磷酸生产系统使用，提高磷的回收率，降低磷酸生产消耗。
Phosphogypsum pretreatment and purification method
The invention discloses a phosphogypsum pretreatment and purification method, belonging to the technical field of phosphogypsum purification. The method comprises the following steps: washing slag discharged from a wet-process phosphoric acid production line with washing water for washing phosphogypsum and a filtrate in a slag hopper, and conducting repulping; pumping the repulped slurry into a slurry distribution box of a belt filter for uniform distribution; dehydrating the slurry, and then carrying out countercurrent washing twice; drying the washed phosphogypsum with a desiccant, and conducting blowing; and sending a filtrate obtained after repulping to a phosphoric acid production system for use. The phosphogypsum having been subjected to dehydration, washing and blowing has a water-soluble phosphorus content of less than or equal to 0.05%, a water-soluble fluorine content of less than or equal to 0.03%, a pH value of greater than or equal to 5 and a water content of less than orequal to 23%. The treated phosphogypsum can directly enter a building gypsum production area, so the stockpiling time is greatly shortened, the volume occupation of a slag bin is reduced, and the service life of the slag bin is favorably prolonged. The filtrate returns to a phosphoric acid production system for use, so the recovery rate of phosphorus is increased, and production consumption of phosphoric acid is reduced.
本发明公开了一种磷石膏预处理净化方法，涉及磷石膏净化技术领域。将从湿法磷酸生产线上卸下的渣在渣斗内用洗涤磷石膏的洗水和滤液冲洗再浆；再浆后的料浆经泵送至带式过滤机的料浆分布箱中均匀布料；料浆先进行脱水，再经过两次逆流洗涤；洗涤后的磷石膏经吸干后喷吹；再浆后的滤液送至磷酸生产系统使用。经脱水洗涤喷吹后的磷石膏水溶磷≤0.05％、水溶性氟≤0.03％，pH≥5，含水量≤23％。处理后的磷石膏可直接进入到建筑石膏生产区域，大幅降低堆存时间，减少渣库的容积占用，有利于延长渣库的服务年限。滤液返回磷酸生产系统使用，提高磷的回收率，降低磷酸生产消耗。
Phosphogypsum pretreatment and purification method
一种磷石膏预处理净化方法
LIU ZHENGDONG (Autor:in) / ZHOU QIONGBO (Autor:in) / BA JIGUI (Autor:in) / NIU SIJIANG (Autor:in) / LI JIAN (Autor:in) / ZHOU BO (Autor:in) / FAN YONGLIN (Autor:in) / LI JIE (Autor:in) / WEI CHAO'AN (Autor:in) / JIN BIN (Autor:in)
10.11.2020
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
Phosphogypsum closed internal circulation pretreatment process
| Europäisches Patentamt | 2021
Preparation method and device of phosphogypsum pretreatment agent
| Europäisches Patentamt | 2022