Process for recovering waste rare-earth water and fully cyclic treatment

Abstract

The invention belongs to the field of waste water treatment, and relates to a process method for rare earth waste water recovery and full-cycle treatment. According to the different properties of waste water in rare earth production, physical and chemical methods are used to carry out classified recovery and comprehensive treatment, and a new type of continuous chemical device is applied. Waste treatment and waste treatment, realizing ammonium salt wastewater and acid wastewater generated during rare earth extraction and rare earth roasting production process, all of which are classified and recycled, and comprehensively treated. The treated wastewater can all be returned to the rare earth process for recycling. The enterprise has no industrial wastewater discharge, and at the same time It also improves the purification effect of the waste gas system of rare earth enterprises, so that it can meet the emission standards.

Description

1. Technical field: [0001] The invention belongs to the field of waste water treatment and relates to a process method for rare earth waste water recovery and full cycle treatment. 2. Background technology: [0002] At present, most domestic rare earth production enterprises can produce a large amount of wastewater containing fluorine, sulfuric acid (hydrochloric acid), and ammonium salt (ammonia nitrogen) during the production of rare earths. These wastewaters have high concentrations and large discharges, causing great pollution to the environment. Generally, rare earth production enterprises can use lime neutralization method to remove acidic substances and fluorides, or use electrodialysis (reverse osmosis) plus concentration or biological oxidation decomposition technology to treat ammonium salt or ammonia nitrogen wastewater, but due to the special limitations of rare earth wastewater, these The process is either a huge investment, or the cost is too high, and it is ev...

AI Technical Summary

Problems solved by technology

[0002] At present, most domestic rare earth production enterprises can produce a large amount of wastewater containing fluorine, sulfuric acid (hydrochloric acid), and ammonium salt (ammonia nitrogen) during the production of rare earths. These wastewaters have high concentrations and large discharges, causing great pollution to the environment. Generally, rare earth production enterprises can use lime neutralization method to remove acidic substances and fluorides, or use electrodialysis (reverse osmosis) plus concentration or biological oxidation decomposition technology to treat ammonium salt or ammonia nitrogen wastewater, but due to the special limitations of rare earth wastewater, these The process is either a huge investment, or the cost is too high, and it is even technically and economically infeasible, and the enterprise cannot afford it

Therefore, this problem has continued to this day and has not been resolved. This weakness has restricted the development and survival of rare earth enterprises and the use of resource advantages.

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