Method for extracting rare earth from ion-absorbing type rare earth ore effectively and cleanly

Abstract

The invention discloses a method for extracting rare earth from ion-absorbing type rare earth ore effectively and cleanly. Ore leaching liquid is formed by configuring a leaching agent and a leachingaid agent, and used for leaching the ion-absorbing type rare earth ore to obtain rare earth leaching liquid; the content of the leaching aid agent in the rare earth leaching liquid is controlled, anda pure rare earth solution is obtained after removing impurities with calcium / magnesium basic compounds; the calcium / magnesium basic compounds continue to be added for a precipitation reaction to obtain hydroxide rare earth precipitates and precipitate mother liquor; and rare earth concentrate is obtained by roasting the rare earth hydroxide precipitates. The leaching aid agent can enhance the leaching of ion-phase rare earth in the ion-absorbing type rare earth ore and improves the leaching rate; the removal rate of aluminum in the impurity removing process is improved, and the loss rate of rare earth is reduced; and the competitive coordination adsorption between the leaching aid agent and sulfate radical can effectively reduce the content of the sulfate radical in rare earth hydroxide and facilitate the formation of crystalline rare earth hydroxide precipitation. The method for extracting the rare earth from the ion-absorbing type rare earth ore effectively and cleanly can realize efficient and clean extraction of the ion-absorbing type rare earth ore.

Description

technical field [0001] The invention relates to the field of rare earth hydrometallurgy, in particular to a method for efficiently and cleanly extracting rare earth from ion-adsorption type rare earth ore. Background technique [0002] Ionic rare earth ore is a new type of exogenous rare earth mineral, which was first discovered in Ganzhou City, Jiangxi Province, my country in 1969. Such minerals are widely distributed in Jiangxi, Guangdong, Guangxi and other provinces in southern my country. They have a complete distribution of rare earths, low radioactivity, and are rich in medium and heavy rare earth elements. They are valuable strategic mineral resources in my country. The development and utilization of ionic rare earth ores can solve the problem that monazite, bastnaesite, and mixed rare earth ores almost only produce light rare earths but lack medium and heavy rare earths. Under normal circumstances, the full-phase rare earth grade in ion-adsorption rare earth ores is...

AI Technical Summary

Problems solved by technology

In the precipitation process, the rare earth hydroxide obtained by the calcium-magnesium alkaline precipitant precipitation method tends to colloid, and the filtration performance is poor, which affects production efficiency and easily absorbs impurity ions

Secondly, the sulfate radical in the rare earth precipitation mother liquor can form basic rare earth sulfate with the rare earth, and the sulfate radical in the coordination precipitation cannot be removed by washing, which will affect the purity of the rare earth concentrate after roasting

[0004] To sum up, how to provide an efficient and clean extraction method of ion-adsorption rare earth ores to reduce or even eliminate ammonia nitrogen pollution, solve the problem of low rare earth leaching rate, high rare earth loss during impurity removal, and the introduction of sulfate radicals into precipitated products during precipitation The problem of unqualified rare earth concentrate purity has become a technical problem to be solved urgently