Technology for preprocessing wastewater generated in dysprosium oxide production

Abstract

The invention discloses a technology for preprocessing wastewater generated in dysprosium oxide production, and belongs to the technical field of rare earth processing. The technology comprises following steps: introducing production wastewater into an oil separating tank to remove most of grease; after the grease is removed, adding a flocculating agent, after precipitation, removing the precipitates to obtain supernate (A), introducing the supernate (A) into a stirring tank, adding a heavy metal adsorbent, removing the precipitates to obtain supernate (B), filtering the supernate (B) to obtain filtrate, making the filtrate go through macroporous adsorption resin, collecting the effluent, making the effluent go through a reverse osmosis membrane to obtain a penetrating liquid, and carryingout photocatalytic reactions. The wastewater is preprocessed by a plurality of processing technologies, heavy metals, organic substances, and ammonia nitrogen in wastewater are fully processed; the processing effect is good, after processing, the wastewater can reach the discharge standards; the processed wastewater can be further processed, the subsequent water treatment efficiency is improved;and the preprocessed wastewater can be processed under different conditions.

Description

technical field [0001] The invention relates to the technical field of rare earth processing, in particular to a pretreatment process for dysprosium oxide production wastewater. Background technique [0002] my country is rich in rare earth resources and is a big country in rare earth mining and processing. After half a century of development, my country's rare earth industry has made great achievements. Its rare earth mineral output has been ranking first in the world in recent years, which has brought huge resource benefits to our country, but at the same time caused corresponding environmental problems. [0003] my country has strict requirements on the quality of the wastewater discharged from the rare earth industry. Because the wastewater contains a lot of oily substances and heavy metal ions, it is difficult for various enterprises to meet the wastewater discharge requirements, which greatly restricts the development of the rare earth industry. Contents of the inven...

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Problems solved by technology

[0003] my country has strict requirements on the quality of wastewater discharged from the rare earth industry. Because the wastewater contains a lot of oily substances and heavy metal ions, it is difficult for various enterprises to meet the wastewater discharge requirements, which greatly restricts the development of the rare earth industry.

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