Membrane technology-based ionic rare earth ore extraction technology and device therefor

Abstract

The invention relates to a membrane technology-based ionic rare earth ore extraction technology and a device therefor. The membrane technology-based ionic rare earth ore extraction technology comprises the following steps of removing impurities in a rare earth ore percolation liquid, carrying out solid-liquid separation by a ceramic membrane to remove suspended solids in the rare earth ore percolation liquid, carrying out nanofiltration on the ceramic membrane clear liquid for further enrichment concentration, treating the ceramic membrane concentrated solution by a plate-and-frame filter press, removing dreg, when the rare earth ore percolate has the content of 60-70g / L after nanofiltration concentration, feeding the rare earth ore percolate into an extraction unit, carrying out extraction separation of a single rare earth element, and directly feeding the nanofiltration clear liquid rich in an extraction agent back to a percolation unit. Through the membrane separation and integration technology, the rare earth ore percolate is subjected to purification, separation, and concentration enrichment so that rare earth ions in the percolate are purified and concentrated and the next extraction process is convenient, and the rare earth ore percolation liquid subjected to separation from rare earth has a low rare earth ion concentration and a high extraction agent concentration and can be directly used for the percolation process. The membrane technology-based ionic rare earth ore extraction technology greatly improves a rare earth ion recovery rate, reduces a percolation waste water discharge amount and has obvious environmental and economic benefits.

Description

[0001] technical field [0002] The present invention relates to a rare earth extraction process of ionic rare earth ore based on membrane technology, in particular to a process for treating ionic rare earth ore leachate by impurity removal, ceramic membrane separation, and nanofiltration membrane concentration, so that the leachate can be processed After reaching the process requirement of direct extraction, it belongs to the field of rare earth ore extraction and separation. [0003] Background technique [0004] In the south mainly in Jiangxi, Guangdong, Hunan, and Fujian, there are abundant ion-adsorbed rare earths (referred to as ionic rare earths, or weathered crust leached rare earths) resources, and their main characteristics are: (1) low grade, generally in Less than 3 / 1000, mostly a few parts per 10,000; (2) The distribution of rare earth elements is complete, especially the high content of medium and heavy rare earths, so it has received extensive attention at ho...

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the defects of the traditional ion-type rare earth ore extraction process, and use the membrane separation integration technology in the extraction process of the ion-type rare earth ore to replace the ammonium bicarbonate precipitation, drying, burning, and acid extraction in the traditional rare earth extraction process. It provides a membrane separation integration process with low investment, low cost, small footprint, simple and easy continuous automatic operation, and through the high concentration of rare earth ions, to solve the problem caused by the increasingly depleted rare earth ore The problem of low concentration of rare earth ions in the impregnation solution

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