A process for acid-alkali resource recovery of sodium saponification wastewater

Abstract

The invention relates to an acid and alkali resource recovery process technology from sodium saponification waste water discharged in a rare earth separating and manufacturing process. The acid and alkali resource recovery process technology of the invention mainly comprises three steps, including pre-treating of the waste water, treating by a membrane process and recycling of acids and alkalis. According to the process of the invention, acids and alkalis needed in the rare earth separating process can be produced from the sodium saponification waste water with high sodium chloride content, so as to effectively realize the purpose of zero release and acid and alkali resource recovery after treatment of the waste water.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a process for realizing zero discharge of rare earth separation industrial sodium saponification wastewater and acid-base resource utilization. Background technique [0002] Rare earth is China's most abundant strategic resource, and it is an important basic material for high-tech fields such as information technology, biotechnology, and energy technology, as well as for national defense construction. It also plays an important role in transforming certain traditional industries, such as agriculture, chemicals, and building materials. . However, the pollution problems accumulated during the long-term mining and smelting of rare earths in my country pose a serious threat to the ecological environment and people's health. my country's "Rare Earth Industrial Pollutant Discharge Standards" formulated in 2011 has a relatively high threshold for specified values, and so...

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Problems solved by technology

[0007] (3) Its composition is complex, containing a variety of residual rare earth elements, Ca, Mg, K, Zn, Ni, Pb and other metals and heavy metal elements;

[0009] In terms of sodium saponification wastewater treatment, there are many low-level treatment processes, some of which use simple treatment followed by evaporation treatment. This kind of treatment wastes more energy and has higher operating costs.

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