Method for extracting and separating rubidium ions from salt lake brine

A salt lake brine and rubidium ion technology, applied in the field of rubidium ion separation, can solve the problems of production equipment corrosion and low rubidium ion extraction efficiency, and achieve the effect of reducing the degree of corrosion and improving extraction efficiency

Inactive Publication Date: 2019-12-10
QINGHAI UNIV FOR NATITIES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a method for extracting and separating rubidium ions from salt lake brine, which can effectively solve the problem of adjusting the extraction water phase to a strong extraction method in order to improve extraction efficiency in the existing extraction method. Alkaline, which leads to serious corrosion of production equipment; at the same time, magnesium hydroxide precipitation will occur during the extraction process in a strong alkaline environment, and the magnesium hydroxide precipitation will take away part of the rubidium ions, resulting in low extraction efficiency of rubidium ions

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  • Method for extracting and separating rubidium ions from salt lake brine
  • Method for extracting and separating rubidium ions from salt lake brine
  • Method for extracting and separating rubidium ions from salt lake brine

Examples

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Effect test

Embodiment 1

[0026] Accurately weigh 5 equal parts of extractant 18-crown-6 at room temperature, dissolve them in diluent xylene, ethyl acetate, chloroform, 1,2-chloroethane, ionic liquid 1-butyl-3 Methylimidazolium hexafluorophosphate [C 4 mim][PF 6 ], and fully stirred and mixed uniformly to form 5 different organic phases, the molar concentration of the extractant 18-crown-6 in the 5 organic phases was 0.50mol / L; the 5 different organic phases were respectively Put it in a separatory funnel with rubidium-containing brine at a volume ratio of 1:1, vibrate for 15 minutes at a speed of 300r / min, centrifuge, and separate the organic phase and the aqueous phase.

[0027] The five organic phases were tested and calculated, and the extraction rates of the five organic relative rubidium ions were 37.18%, 39.56%, 41.17%, 39.33%, and 80.21%. It can be seen that the extraction efficiency of the organic phase of rubidium ions formed by the extractant 18-crown-6 and the ionic liquid is significant...

Embodiment 2

[0029] Accurately weigh a certain amount of extractant 18-crown-6 at room temperature and dissolve in diluent 1-butyl-3 methylimidazole hexafluorophosphate [C 4 mim][PF 6 ], and fully stirred and mixed to form an organic phase, the molar concentration of the extractant 18-crown-6 in the organic phase is 0.50mol / L; the organic phase and the rubidium-containing brine are placed in a volume ratio of 3:2 In a separatory funnel, vibrate for 15 min at a rotational speed of 300 r / min, and centrifuge to separate the organic phase and the aqueous phase.

[0030] The organic phase was tested and calculated separately. The extraction rate of the five main metal ions in the brine, rubidium (Rb), potassium (K), sodium (Na), lithium (Li), and magnesium (Mg), was 82.97%. , 17.13%, 2.41%, 0.34%, 0.49%. It can be seen that the ionic liquid system has a higher single-stage extraction rate and better selectivity for rubidium ions in brine.

Embodiment 3

[0032] Accurately weigh a certain amount of extractant dibenzo-21-crown-7 at room temperature and dissolve in diluent 1-butyl-3 methylimidazole bistrifluoromethylsulfonimide salt [C 4 mim][NTf 2 ], and fully stirred and mixed uniformly to form an organic phase, the molar concentration of the extractant dibenzo-21-crown-7 in the organic phase is 0.20mol / L; the organic phase and the rubidium-containing brine are according to the volume ratio of 2: 1 Place in a separatory funnel, vibrate for 15 min at a speed of 300 r / min, and centrifuge to separate the organic phase and the aqueous phase.

[0033] The organic phase was tested and calculated, and the extraction rate of the five main metal ions in the brine, rubidium (Rb), potassium (K), sodium (Na), lithium (Li), and magnesium (Mg), was 90.88%, 20.63%, 3.35%, 0.11%, 0.13%. It can be seen that the ionic liquid system has a higher single-stage extraction rate and better selectivity for rubidium ions in brine.

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Abstract

The invention discloses a method for extracting and separating rubidium ions from salt lake brine. The method comprises the following steps weighing a proper amount of an extracting agent, dissolvingthe extracting agent in a diluent, and uniformly stirring to form an organic phase; concentrating salt lake brine into brine with the mass concentration of rubidium ions higher than 10 mgL to obtain awater phase; mixing the organic and aqueous phases in ratio of 0.5-51, then shaking for 5-60min, centrifuging, separating, and removing the water phase to obtain a rubidium ion enriched organic phase. The method can effectively improve the extraction rate of rubidium ions without adjusting the extraction water phase to be strong alkaline, so that the pretreatment process of extracting rubidium byan extraction method is simplified, the corrosion to equipment is reduced, and meanwhile, the generated magnesium hydroxide precipitate is reduced, and the extraction efficiency of rubidium ions is improved.

Description

technical field [0001] The invention relates to the technical field of rubidium ion separation, in particular to a method for extracting and separating rubidium ions from salt lake brine. Background technique [0002] Rubidium is an extremely important rare and precious metal resource, which plays an important role in national defense, medicine, economy and energy. With the gradual reduction of solid mineral reserves and the increase of production costs, the extraction of rubidium has gradually shifted from solid minerals to liquid minerals. Salt lake brine containing rubidium ions in Qinghai and Tibet is a high-quality ore source for extracting rubidium. After years of development, the methods for separating and extracting rubidium mainly include fractional crystallization, precipitation, solvent extraction and ion exchange. Among them, the solvent extraction method is a more effective method for extracting rubidium from liquid rubidium ore due to its characteristics of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/10C22B7/00C22B3/26
CPCC22B7/005C22B26/10C22B3/304Y02P10/20
Inventor 石成龙秦亚茹李海朝宋萍杨小波李宏霞宋桂秀
Owner QINGHAI UNIV FOR NATITIES
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