Rear earth smelting wastewater treatment process

Abstract

The invention belongs to the technical field of water pollution prevention control, and particularly relates to a rear earth smelting wastewater treatment process. The invention provides a combined wastewater treatment process with the advantages of low investment, simplicity for operation and high treatment efficiency, so as to enable rear earth smelting wastewater to be discharged under the condition that the discharge standards are met. The process comprises a workshop treatment unit and a deep treatment unit; and the wastewater is treated with the workshop treatment unit at first and then flows into the deep treatment unit for retreatment. According to the process, the problem that phosphorus and heavy metal in the wastewater treatment process of rear earth smelting enterprises after introduction of new standards are unlikely to meet the standards is solved; the wastewater can be discharged under the condition that the discharge standards are met by adopting the economic and reasonable combined wastewater treatment process of 'microelectrolyzation-dephosphorization-heavy metal removal-advanced oxidation' for the characteristics of high acidity, high salt content, high CODCr (chemical oxygen demand chromium) content, excessive phosphorus content and excessive heavy metal content of the rear earth smelting wastewater; the problems of the enterprises are satisfactorily solved; and the process has a remarkable meaning for the benign operation and long-term development of the enterprises.

Description

technical field [0001] The invention belongs to the technical field of water pollution prevention and control, and specifically relates to a rare earth smelting wastewater treatment process. Background technique [0002] After more than 50 years of development, my country's rare earth processing and application industry has formed an entire industrial chain including mining, beneficiation, separation, smelting, and processing. There are three types of rare earth minerals widely used in my country's current industrial production: Baotou mixed rare earth, bastnaesite, and ion-adsorbed rare earth minerals. In view of the above three major rare earth mineral resources, my country has formed independent but interrelated rare earth ore mining and smelting separation technology, which can be summarized as: concentrate decomposition and extraction → rare earth grouping and separation → rare earth metal and alloy preparation part. [0003] At present, almost all the rare earth group...

AI Technical Summary

Problems solved by technology

Therefore, the biological method has a broader development prospect, but there are certain restrictions on the salt content in wastewater

Electrochemical treatment of heavy metal wastewater can recycle resources, but because the concentration of heavy metals in wastewater is generally low, using traditional electrochemical methods for treatment has low current efficiency and high power consumption

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