Rare earth wastewater treatment and recovery process

Abstract

The invention discloses a rare earth wastewater treatment and recovery process, wherein rare earth wastewater is filtered by a quartz sand filter, a microporous filter and an ultrafiltration device, and then is subjected to rare earth and nitrogen ammonia enrichment, rare earth recovery, nitrogen ammonia absorption and other operations, so that the enrichment of the rare earth ions and the nitrogen ammonia in the rare earth wastewater, the recovery of the rare earth ions and the nitrogen ammonia and the standard discharge of the wastewater are achieved. According to the invention, through thenanofiltration device, the enrichment of rare earth and nitrogen ammonia in a waste liquid is realized, the treatment load of rare earth and nitrogen ammonia recovery is reduced, the recovery energy consumption is reduced, and the recovery efficiency and the recovery rate are improved; by stripping and adding the agent into the filtrate to recover ammonia nitrogen, the recovery rate of ammonia nitrogen is improved; the stability of the whole filtering system is realized through the three-stage filtering of quartz sand filtering, microporous filtering and ultrafiltration; and the rare earth wastewater treatment and recovery process is simple to operate and low in treatment cost, and is suitable for industrial production.

Description

Technical field [0001] The invention relates to the field of rare earth wastewater treatment, in particular to a rare earth wastewater treatment and recovery process. Background technique [0002] Although China's rare earth resources are widely distributed, rich in reserves, and complete in rare earth species, they have laid a solid foundation for the development of China's rare earth industry. However, during the development process, China's rare earth industry has many problems, and a large amount of waste water is generated in the rare earth smelting process. Wastewater contains a large amount of rare earth elements and ammonia nitrogen. If it is not treated in time and effectively, it will not only waste precious rare earth resources, but also cause serious environmental pollution. The amount of rare earth wastewater is large, the composition is complex and contains a lot of pollutants. The pollution problem of wastewater in rare earth smelting has become increasingly promin...

AI Technical Summary

Problems solved by technology

[0003] Invention patent CN 102260000 B provides a process for the treatment and recycling of ammonium chloride rare earth wastewater. This process enriches the ammonia nitrogen in the wastewater through DEP microfiltration and DEP nanofiltration, and then conducts electrolysis. The nitrogen and ammonia enrichment process of this process is easy. It leads to the reduction or blockage of the filtration rate of DEP microfiltration membrane and DEP nanofiltration membrane, and the electrolysis of ammonia nitrogen wastewater consumes a lot of energy

The membrane group used in this invention needs to be replaced frequently, the cost is high, and the recovery of rare earth elements in wastewater cannot be realized

[0005] Rare earth process wastewater is produced in a large amount, and the concentration of ammonia nitrogen and rare earth contained in it is high. There are many treatment methods for rare earth ammonia nitrogen wastewater. Each method is used alone to treat rare earth ammonia nitrogen wastewater. The quality of the treated effluent cannot meet the relevant standard limits, or running costs are too high

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