Method and device for treating rare-earth molten high ammonia nitrogen wastewater by using integrated membrane technology

Abstract

The invention provides a method and device for treating rare-earth molten high ammonia nitrogen wastewater by using an integrated membrane technology. The method adopts a process of filter press / coarse filtration, complexing-ultrafiltration and reverse osmosis, and is used for treating rare-earth molten high ammonia nitrogen wastewater through pre-purification, complexing-ultrafiltration couplingand reverse osmosis. The device comprises a coarse filter device, an ultrafiltration feed pump, an ultrafiltration pressure valve, an ultrafiltration pressure gauge, a complexing agent water tank, anultrafiltration concentrate tank, an ultrafiltration membrane component, a reverse osmosis feed pump, a pH regulating tank, a reverse osmosis pressure valve, a reverse osmosis pressure gauge, a reverse osmosis membrane component, a reverse osmosis water production tank and a reverse osmosis concentrate tank. The method and device can be used for effectively solving the problems of ion type rare-earth industrial wastewater treatment and up-to-standard discharge and recycling ammonia and nitrogen in the wastewater, have the advantages of high separating and recycling efficiency, simple process,convenience in operation and the like, and have great development potential and wide application prospect in rare-earth industry.

Description

technical field [0001] The invention relates to a method and a device for treating high-ammonia-nitrogen wastewater from rare earth smelting by using integrated membrane technology, belonging to the technical field of wastewater treatment. Background technique [0002] Rare earth elements are important basic materials in high-tech fields such as information technology, biotechnology, and energy technology, as well as in national defense construction. They are known as "vitamins of modern industry" and "treasure house of new materials". The output of rare earth minerals in my country has always ranked first in the world, and the ionic rare earth resources account for 90% of the world's similar resources, of which the ionic rare earth resources in southern Jiangxi account for 65% of the national similar resources. [0003] However, the large amount of ammonia-nitrogen wastewater generated during rare earth mining has become one of the most challenging research topics. At pres...

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Problems solved by technology

Although these methods have their own characteristics, they also have certain limitations. To varying degrees, there are defects such as large energy consumption, high cost, low efficiency, and secondary pollution, resulting in high production costs.

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