Method for preparing urea by recycling vanadium precipitation wastewater

• Main Authors: XU RAN, LI BAISONG, ZHANG SHIJU, XIONG SHUAI, SONG TAO, HU YIFAN, LI XILIN, XU LINGLI
• Format: Patent
• Language: Chinese; English
• Published: 18.10.2022
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; ORGANIC CHEMISTRY

The invention relates to a method for preparing urea by recycling vanadium precipitation wastewater, and belongs to the technical field of vanadium precipitation wastewater reutilization. The method for preparing the urea by recycling the vanadium precipitation wastewater comprises the following steps: A, reducing the vanadium precipitation wastewater by a sodium salt roasting method; b, absorption of SO2; and C, preparing urea. The method for preparing the urea by recycling the vanadium precipitation wastewater is high in recycling efficiency, and the cost is saved. According to the method, the vanadium precipitation wastewater is treated, so that the yield of subsequent sodium sulfide can reach 89.3-97.2%, the sodium sulfide is also easy to leach and purify, and the purity can reach 97.6-99.9% after simple alkali liquor leaching, concentration and drying. 本发明涉及一种沉钒废水回收利用制取尿素的方法，属于沉钒废水再利用技术领域。本发明所述沉钒废水回收利用制取尿素的方法包括：A.钠化焙烧法沉钒废水的还原；B.SO2的吸收；C.尿素的制备。本发明的沉钒废水回收利用制取尿素的方法，回收效率高，节约了成本。本发明对沉钒废水处理使得后续硫化钠的产率可达到89.3～97