Method for preparing acid-base from rare-earth sodium saponification waste water

Abstract

The invention provides a method for preparing acid-base from rare-earth sodium saponification waste water. The method comprises the steps that: firstly sodium saponification waste water is treated by a sedimentation basin and an ultrafiltration system; water produced by the ultrafiltration system enters an oil removal system to be treated, and concentrated water enters the sedimentation basin to be settled; water produced by the oil removal system enters a nanofiltration system to be treated; water produced by the nanofiltration system enters a bipolar membrane system to be treated, and concentrated water returns to the sedimentation basin; water treated by the bipolar membrane system is acid-base, and residual thin brine is conveyed to an electrodialysis system to be treated; concentrated water passing through the electrodialysis system returns to the bipolar membrane system for producing the acid-base, part of freshwater enters the bipolar membrane system to serve as make-up water, and part of freshwater serves as recycle water. According to the method, a pretreatment and membrane integration technology is adopted for treating rare earth metallurgy waste water, a final permeating liquid is used for production, concentration desalination treatment is carried out on smelting waste water by using the characteristics of ultrafiltration, electrodialysis, a nano-filtration membrane and a bipolar membrane, a concentrated liquid is used for preparing acid-base, and freshwater subjected to electrodialysis treatment is recycled; and the rare-earth sodium saponification waste water is comprehensively treated.

Description

technical field [0001] The invention relates to a process for preparing acid-base from rare earth sodium saponification wastewater. Background technique [0002] As a strategic resource, rare earth has been highly valued by many countries in the world. Although the proportion of my country's rare earth industry in the entire national economy is very small, with an annual output value of less than 1 billion US dollars, it has been highly valued by government departments at all levels because of its unique strategic position, especially in the past 10 years. With the development of rare earth products in many application fields, the state pays more and more attention to the rare earth industry. Industrial policies have been introduced many times, which on the one hand promotes the overall structure optimization of the rare earth industry, and on the other hand promotes the development of the rare earth industry. Rare earth smelting is the main method in the separation of rare ...

AI Technical Summary

Problems solved by technology

Domestic rare earth smelters generally use acid-base neutralization as waste water and discharge it up to standard, which not only wastes resources, but also increases the burden of environmental protection

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