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A platform for research: civil engineering, architecture and urbanism
Phosphogypsum deep purification method
The invention discloses a phosphogypsum deep purification method, and relates to the technical field of phosphogypsum deep purification. The method comprises the following steps of: adding water intothe byproduct phosphogypsum in the wet-process phosphoric acid production process, and performing repulping, and controlling the solid content at 20-40%; and filtering the repulped phosphogypsum by afilter, carrying out multistage countercurrent washing on a gypsum filter cake to obtain purified phosphogypsum, and recovering the generated phosphorus-containing filtrate to a phosphoric acid production device for use. According to the characteristics of water-soluble P and F in phosphogypsum, the phosphogypsum is repulped, P and F among crystals are dissolved out and filtered, the gypsum filtercake is subjected to multi-stage countercurrent washing, the water-soluble P and F in the phosphogypsum are further reduced, and the high-quality purified phosphogypsum with low impurity content is obtained.
本发明公开了一种磷石膏深度净化方法，涉及磷石膏深度净化技术领域。先将湿法磷酸生产过程中副产磷石膏加水再浆，控制含固量为20～40％；再将再浆磷石膏经过滤机过滤后，石膏滤饼经多级逆流洗涤，获得净化磷石膏，产生的含磷滤液水回收至磷酸生产装置使用。根据磷石膏中水溶性P、F的特点，先对磷石膏再浆，将晶体间P、F溶出，过滤后，石膏滤饼在经过多级逆流洗涤，进一步降低石膏中的水溶性P、F，获得杂质含量低的高品质净化磷石膏。
Phosphogypsum deep purification method
The invention discloses a phosphogypsum deep purification method, and relates to the technical field of phosphogypsum deep purification. The method comprises the following steps of: adding water intothe byproduct phosphogypsum in the wet-process phosphoric acid production process, and performing repulping, and controlling the solid content at 20-40%; and filtering the repulped phosphogypsum by afilter, carrying out multistage countercurrent washing on a gypsum filter cake to obtain purified phosphogypsum, and recovering the generated phosphorus-containing filtrate to a phosphoric acid production device for use. According to the characteristics of water-soluble P and F in phosphogypsum, the phosphogypsum is repulped, P and F among crystals are dissolved out and filtered, the gypsum filtercake is subjected to multi-stage countercurrent washing, the water-soluble P and F in the phosphogypsum are further reduced, and the high-quality purified phosphogypsum with low impurity content is obtained.
本发明公开了一种磷石膏深度净化方法，涉及磷石膏深度净化技术领域。先将湿法磷酸生产过程中副产磷石膏加水再浆，控制含固量为20～40％；再将再浆磷石膏经过滤机过滤后，石膏滤饼经多级逆流洗涤，获得净化磷石膏，产生的含磷滤液水回收至磷酸生产装置使用。根据磷石膏中水溶性P、F的特点，先对磷石膏再浆，将晶体间P、F溶出，过滤后，石膏滤饼在经过多级逆流洗涤，进一步降低石膏中的水溶性P、F，获得杂质含量低的高品质净化磷石膏。
Phosphogypsum deep purification method
一种磷石膏深度净化方法
ZHOU QIONGBO (author) / LIU ZHENGDONG (author) / FANG ZHUKUN (author) / ZHOU BO (author) / NIU SIJIANG (author) / BA JIGUI (author) / LI JIAN (author) / ZHAO ZHIBO (author)
2020-11-06
Patent
Electronic Resource
Chinese
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