Method for removing aluminum in rare-earth solution

A rare earth material liquid and solution technology, which is applied in the direction of improving process efficiency, can solve the problems of increasing production costs, difficulty in wastewater treatment, and many steps, and achieve the effects of eliminating emulsification, continuous production process, and significant economic benefits

Active Publication Date: 2013-06-12
CHINA NORTHERN RARE EARTH (GROUP) HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can control the emulsification of the feed liquid, there are many steps, and the use of oxalic acid to precipitate the stripping liquid also increases the production cost and the difficulty of wastewater treatment

Method used

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  • Method for removing aluminum in rare-earth solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The REO in the praseodymium neodymium rare earth feed liquid is 1.68mol / L, and the Al 2 o 3 It is 0.003~0.03mol / L. Using the method of fractional distillation extraction, the organic phase is saponified first, and then the above-mentioned feed liquid is extracted. The fractional distillation extraction process conditions are:

[0018] The organic phase is prepared as follows: naphthenic acid: isooctyl alcohol: the volume ratio of kerosene is 25%: 20%: 55%;

[0019] The degree of saponification of the organic phase is controlled at 0.1-0.5mol / L;

[0020] Fractional extraction flow ratio is: organic phase: rare earth feed liquid: lotion: reverse liquid volume ratio is 40-60:50-80:3-20:1-3L / min, wherein the acidity of the lotion is 0.1-3.0mol / min L, the acidity of the reverse liquid is 1.0-4.5mol / L;

[0021] Fractional extraction stage distribution is as follows: extraction section: washing section: stripping section stage ratio is 8:10:7;

[0022] The extraction mixi...

Embodiment 2

[0026] The REO in the praseodymium neodymium rare earth feed liquid is 1.68mol / L, and the Al 2 o 3 It is 0.003~0.03mol / L. Using the method of fractional distillation extraction, the organic phase is saponified first, and then the above-mentioned feed liquid is extracted. The fractional distillation extraction process conditions are:

[0027] The organic phase is prepared as follows: naphthenic acid: isooctyl alcohol: the volume ratio of kerosene is 25%: 20%: 55%;

[0028] The degree of saponification of the organic phase is controlled at 0.1-0.5mol / L;

[0029] Fractional extraction flow ratio is: organic phase: rare earth feed liquid: washing liquid: reverse liquid volume ratio is 40-60: 80-120: 3-20: 1-3L / min; acidity of washing liquid is 0.1-3.0mol / L , the acidity of the reverse liquid is 1.0-4.5mol / L;

[0030] Fractional extraction stage distribution is as follows: extraction section: washing section: stripping section stage ratio is 8:10:7;

[0031] The extraction mix...

Embodiment 3

[0035] The REO in the praseodymium neodymium rare earth feed liquid is 1.68mol / L, and the Al 2 o 3 It is 0.003~0.03mol / L. Using the method of fractional distillation extraction, the organic phase is saponified first, and then the above-mentioned feed liquid is extracted. The fractional distillation extraction process conditions are:

[0036] The organic phase is prepared as follows: naphthenic acid: isooctyl alcohol: the volume ratio of kerosene is 25%: 20%: 55%;

[0037] The degree of saponification of the organic phase is controlled at 0.1-0.5mol / L;

[0038] Fractional extraction flow ratio is: organic phase: rare earth feed liquid: lotion: reverse liquid volume ratio is 40-60: 120-200: 3-20: 1-3L / min; acidity of lotion is 0.1-3.0mol / L , the acidity of the reverse liquid is 1.0-4.5mol / L;

[0039] The distribution of fractional extraction stages is as follows: extraction section: washing section: stripping section is 8:10:7;

[0040] The extraction mixing time is 5min; ...

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Abstract

The invention relates to a method for removing aluminum in rare-earth solution. The method comprises the following steps of: carrying out saponification for an organic phase, separating aluminum from rare-earth liquid via a method of distilling and extracting, and a distilling and extracting flow rate is as following: a volume ratio of the organic phase: rare-earth solution : washing liquid: reverse liquid is (40-60): (100-200): (3-20): (1-3) L/min; the concentration of REO (rare-earth oxide) in rare-earth solution is (1.6-1.77) mol/L, the concentration of Al2O3 is (0.003-0.03) mol/L, the acidity of washing liquid is (0.1-3.0) mol/L, and the acidity of reverse liquid is (1.0-4.5) mol/L; a distilling and extracting class is that an extracting section: a washing section: a reverse-extracting section equals to 8:10:7; and a recovery rate of rare earth reaches above 99.98 percent. According to the method, a process for removing aluminum is shortened, the phenomenon of emulsification in the extraction is eliminated, the separation efficiency is good, linkage extraction is realized, the recovery rate of rare earth is high, and produced waste water is easier to treat.

Description

technical field [0001] The invention relates to a method for removing aluminum in a rare earth solution. Background technique [0002] During the process of recovering rare earth solution from rare earth ore, a considerable amount of aluminum ions enter the leachate along with the rare earth. At present, the commonly used aluminum removal methods in production mainly include alkali method, acid method, hydrolysis method, extraction method and so on. Wherein the traditional extraction method is to use an organic phase system composed of 25% naphthenic acid-20% isooctyl alcohol-kerosene (volume ratio), add ammonia or sodium hydroxide for saponification, and then utilize a single-stage stirring tank or a multi-stage extraction tank and The rare earth material liquid is stirred and mixed, and the stripping liquid is then precipitated by oxalic acid to realize the separation of rare earth and aluminum to recover rare earth. This method has a large loss of rare earth extraction,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/40C22B59/00
CPCY02P10/20
Inventor 赵治华邢全生刘建军桑晓云郭晓辉赵志强张文斌李旭王喜刚姜东波王平孙祥李俊林
Owner CHINA NORTHERN RARE EARTH (GROUP) HIGH TECH CO LTD
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