A method for removing aluminum in rare earth feed liquid

Abstract

The invention relates to a method for removing aluminium in a tombarthite feed liquid. The method adopts a cocurrent flow extraction section continuous in cascade and a countercurrent reverse extraction section continuous in series, and comprises the following operating steps: adding an organic phase extraction agent and a tombarthite solution in a primary mixing chamber, meanwhile adding an aqueous alkali, then conveying the mixed solution into a primary clarifying chamber, conveying the solution in the primary clarifying chamber into a secondary mixing chamber to stir, meanwhile adding the aqueous alkali, then conveying to a secondary clarifying chamber, then conveying the solution to the next level, and performing the above steps again. The method has the characteristics of good aluminium removing effect, fast tombarthite processing speed, large acid-base consumption and the like.

Description

technical field [0001] The invention relates to a rare earth material liquid treatment technology, in particular to a method for removing aluminum in the rare earth material liquid. Background technique [0002] During the leaching process of ion-adsorbed rare earth ores, a large number of aluminum ions in clay minerals enter the leach solution along with the rare earth. Since the pH of aluminum and rare earth hydroxide precipitation is similar and amphoteric, it is difficult to separate aluminum from rare earth in the rare earth feed solution. The commonly used aluminum removal methods in production today mainly include alkali method, acid method, hydrolysis method, traditional extraction method, single-stage extraction method, etc. Wherein the traditional extraction method is to use the organic phase system of volume ratio 25% naphthenic acid, 20% isooctyl alcohol, 55% kerosene (volume) ratio to form, add ammoniacal liquor or sodium hydroxide saponification, then utilize ...

AI Technical Summary

Problems solved by technology

In this method, the loss of rare earth extraction is relatively large, the consumption of acid and alkali is large, and the effect of removing aluminum is general, and the pH value of the rare earth liquid must be strictly controlled, otherwise it will easily cause emulsification of the system and make the extraction process impossible. The single-stage extraction method is to combine the organic phase with the The rare earth material liquid is added to a large stirring tank at the same time, and then slowly add lye for extraction. After the extraction is completed, stop the machine for clarification, liquid drainage, and stripping. This method has slow rare earth treatment speed and large acid and alkali consumption.