A high-efficiency green extraction method of ion-adsorption rare earths using aluminum sulfate as a leaching agent

Abstract

A high-efficiency and green extraction method of ion-adsorption rare earths using aluminum sulfate as a leaching agent. The method comprises preparation of leaching agent solution, ion adsorption type rare earth leaching, extraction of rare earth and uranium thorium iron from the leaching solution with primary amine, back extraction of rare earth uranium thorium iron from the extraction organic phase, and extraction from the stripping solution with p227 Heavy rare earth and uranium thorium, separate rare earth and uranium thorium with hydrochloric acid back extraction, use hydroxide and basic oxide to precipitate residual aluminum iron thorium from the stripping solution, prepare rare earth products of different specifications by precipitation method, raffinate Degreasing and recycling, recycling of sedimentation wastewater, protonation of the extracted organic phase and other steps. This method can significantly improve the leaching efficiency of the current ion-adsorption type rare earth, greatly reduce the discharge of harmful elements, and enable the reasonable disposal and recovery of radioactive elements such as uranium and thorium, and ensure that the pollutant content in the tailings water leaching solution meets the discharge requirements. It improves the safety and stability of the tailings and is a key technology to realize the efficient and green extraction of ion-adsorbed rare earths.

Description

technical field [0001] The invention relates to an ion-adsorption type rare earth high-efficiency green extraction method using aluminum sulfate as the main leaching agent, and belongs to the technical field of rare earth hydrometallurgy and environmental protection. technical background [0002] Ion-adsorbed rare earth is a unique type of rare earth deposit discovered and named in Longnan, Jiangxi Province for the first time. Its rare earth content is low and it is mainly adsorbed by various clay minerals and colloidal particles in the deposit in an ion state. This kind of rare earth can be exchanged and leached by various types of electrolyte solutions. Based on this, the rare earth extraction technology using sodium chloride and ammonium sulfate as the main leaching reagents is proposed, and large-scale industrial production has been realized. Recently, more and more attention has been paid to the extraction technology of using divalent metal ion salt instead of monovalen...

AI Technical Summary

Problems solved by technology

For example: the ability of naphthenic acid to extract aluminum is stronger than that of rare earths, and aluminum can be preferentially extracted under higher pH conditions, but the emulsification is serious

However, the extraction ability of P507, P204, C272 and other extractants to aluminum is generally between that of rare earth elements, and it is difficult to separate the rare earth from aluminum.

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