Organic recovery method in extraction and separation line

Abstract

An organic recovery method in an extraction and separation line comprises the following steps of: placing organic substances into a first stage of an extraction box; placing alkaline for saponification during a second stage; carrying out cascade clarification during third and fourth stages; and carrying out countercurrent extraction on rare earth soap wastewater obtained during fifth and sixth stages and saponified wastewater obtained during the second stage in the first stage of the extraction box by the use of blank organic substances. By the application of the organic recovery technology, continuity and high efficiency of rare earth industrial production are realized, material consumption of the product is reduced, and production cost is decreased. In addition, the production process is continuous, is simple to operate, and is easy to connect with other rare earth production line. In comparison with traditional technologies, the method can be used to reduce organic consumption by more than 30% and has substantial economic benefits.

Description

technical field [0001] The invention belongs to the technical field of rare earth extraction and separation, and in particular relates to an organic recovery method on an extraction and separation line. Background technique [0002] China is recognized as the country with the largest rare earth resources in the world, not only has large reserves, but also has a comprehensive distribution of elements. After nearly 40 years of development, China has established the largest rare earth industry in the world, and has become the world's largest producer, consumer and supplier of rare earths. Solvent extraction is an important rare earth separation method, which has the advantages of high extraction and separation efficiency, convenient continuous operation and large production capacity, and has become the main method of rare earth separation at home and abroad. However, the existing separation methods generally have organic High unit consumption, high production cost, large resour...

AI Technical Summary

Problems solved by technology

Solvent extraction is an important rare earth separation method, which has the advantages of high extraction and separation efficiency, convenient continuous operation and large production capacity, and has become the main method of rare earth separation at home and abroad. However, the existing separation methods generally have organic High unit consumption, high production cost, large resource consumption, serious environmental pollution and other problems, these problems have become the bottleneck restricting the development of my country's rare earth industry

The saponification method of traditional extraction and separation is that the first stage of the extraction box enters the organic and soap base, and the saponification is continuously stirred, and the second and third stages are clarified or the first stage of the extraction box enters the organic and soap base, and the first, second, and third stages are continuously stirred. Saponification, and then the saponification wastewater and rare earth soap wastewater are directly discharged after simple clarification, so that sediments are easy to form in the extraction tank, which often causes blockage of the water phase pipe, resulting in poor separation of the oil phase and the water phase, and the oil phase is often separated from the water phase. Not only the organic unit consumption is extremely high, but also pollutes the environment, which brings great difficulties to the subsequent wastewater treatment