Impurity Removal Process of Southern Ionic Rare Earth Mine Leaching Solution

Abstract

The invention discloses a south ionic rare earth ore leaching liquid impurity removing process. The process comprises the steps of: preparation of mine leaching liquid rare earth mother liquor, enriching of rare earth by magnesium oxide precipitates, clarification of rare earth enriched matters, alkali leaching impurity removal, acid dissolving and output of Al(OH)3 products. The south ionic rare earth ore leaching liquid impurity removing process uses a high-water-content quick hydroxides for enriching; as hydroxide rare earth is lower in solubility, the enriching recovery rate is almost 100%; the characteristics of magnesium oxide are used for forming nuclear precipitates, so that the precipitation is fast, and the utilization rate of flow equipment is largely increased; the alkali leaching impurity removing efficiency is higher; the rare earth loss is low; the secondary treatment cost of slag can be reduced; the Al(OH)3 products are produced; the economic benefit is obvious; the cost is lower compared with a traditional process; and the rare earth recovery rate is higher than that in the traditional process by 5%.

Description

technical field [0001] The invention relates to a recovery process of rare earth ore, in particular to a process for removing impurities from leach solution of ionic rare earth ore in the south. Background technique [0002] Southern ion-type rare earth deposits, also known as weathering crust elution-type rare earth deposits, were discovered in Longnan, Jiangxi Province in the late 1960s, and then successively found in Nanling areas such as Fujian, Hunan, Guangdong, and Guangxi. Due to its special origin, rare earth ions in southern ionic rare earth mines exist in the clay produced by weathering of various minerals, and their leaching follows the principle of ion exchange. Therefore, the current mining method basically uses electrolyte solution as the leaching agent to exchange ore bodies. The rare earth ions enter the solution, and then go through the impurity removal process, and then precipitate the rare earth with a suitable precipitant to obtain a concentrate with a to...

AI Technical Summary

Problems solved by technology

The non-rare earth impurities in the rare earth mother liquor are mainly Al 3+ And a small amount of non-ferrous metals, alkaline earth metals, etc., except Al 3+ The process is realized by adjusting the pH of the mother liquor to 5.4. During this process, part of the rare earth will co-precipitate, resulting in complicated procedures such as secondary extraction, and at the same time, part of the rare earth will be lost.