Method for performing extraction separation on cobalt and nickel by using microfluid technology

Abstract

The invention provides a method for performing extraction separation on cobalt and nickel by using a microfluid technology. The method comprises the following steps of: uniformly mixing an extraction agent and diluent which are subjected to homogeneous phase saponification by using a mixed material liquid of Co<2+> and Ni<2+>, using 2-ethyl cthylhexyl phosphonate mono 2-ethyl cthylhexyl ester as the extraction agent and using No.260 solvent oil and using the extraction agent and the diluent as an oil phase; introducing the water phase and the oil phase into a micro-reactor by virtue of two flow pumps; mixing the two phases in the micro-reactor and performing extraction reaction at 25-50 DEG C; and collecting a product at an outlet of the micro-reactor and standing for separating the phases to ensure that Co<2+> enters the oil phase and Ni<2+> stays in the water phase so as to realize extraction separation of cobalt and nickel. According to the method, continuous flow micro-reactor with an enhanced hybrid channel structure is adopted, the extraction separation of cobalt and nickel is carried out, and the reaction time is shortened to be within a micro-second level range, so that single-level cobalt extraction efficiency is obviously improved, and the extraction levels are reduced; and moreover, standing layering on the water phase and the oil phase can be quickly carried out without any emulsion phenomenon.

Description

technical field [0001] The invention relates to a method for extraction and separation of cobalt and nickel, in particular to a method for extraction and separation of cobalt and nickel by microfluidic technology. Background technique [0002] Since the 1990s, an important trend in the development of natural science and engineering technology has been miniaturization. The application of continuous flow microfluidics in chemical process treatment, the so-called microchemical process, has been widely used in the field of microscopic technology and chemical engineering. More and more attention has been paid to the continuous chemical reaction in a small volume range. Compared with conventional processes, the selectivity of the reaction has been significantly improved, the mass transfer performance has been greatly enhanced, and the equipment volume has been greatly reduced. Large-scale industrial production can still be guaranteed under the circumstances, which is considered to...

AI Technical Summary

Problems solved by technology

In the current industrial production, the separation methods of cobalt and nickel mainly include chemical precipitation method and extraction separation method. The chemical precipitation method has low selectivity for separating cobalt and nickel, and has the disadvantage of low purity of cobalt and nickel products, which limits its application. Therefore, solvent extraction is mostly used to realize the separation and recovery of cobalt and nickel

[0005] At present, P507 is mainly used in China for the extraction and separation of cobalt and nickel. The main equipment of the extraction system uses an extraction tank. There are many shortcomings in using this traditional process: (1) The consumption of extraction agent is large; (2) Emulsification is prone to occur; ( 3) There are multi-stage extraction, washing and back-extraction processes, the operation is complicated, and the production energy consumption is large; (4) It occupies a large area and there is a fire hazard

[0006] So far, there has been no research on the extraction and separation of cobalt and nickel with microfluidic technology. The present invention provides a process route for extracting and separating cobalt and nickel in a continuous flow mode in a microreactor.