A kind of co-extraction method of boron and lithium in brine

An extraction and brine technology, which is applied in the field of co-extraction and recycling of boron and lithium, can solve the problems of cumbersome procedures and difficult effective phase separation between three liquid phases, simplifies operations and process steps, solves the problem of poor organic phase stability, and is easy to use. The effect of industrial production

Active Publication Date: 2020-11-06
TIANJIN UNIV OF SCI & TECH
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Problems solved by technology

It is worth noting that since this method forms a three-liquid phase system, it is difficult to effectively separate the three liquid phases in the industrial production process.
In addition, since a small amount of boron will enter the middle phase of the polymer, and a small amount of lithium will enter the organic upper phase, the effective separation between boron and lithium cannot be fully realized, and subsequent analysis of the boron and lithium in the upper phase, and the middle phase, respectively, is required. The boron and lithium in the phase are extracted, so the process is cumbersome

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  • A kind of co-extraction method of boron and lithium in brine

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0038] by figure 1 The process scheme shown carries out co-extraction of boron and lithium on the brine containing boron and lithium, and the composition of the brine is Li + 、Na + 、K + , Ca 2+ , Mg 2+ , Cl - , B 2 o 3 The contents are 1.05, 63.52, 53.87, 4.38, 23.42, 226.35g / L respectively.

[0039] Adjust the above brine to pH ≈ 2.5, then add FeCl 3 ·6H 2 O dissolves to obtain a brine containing boron, lithium, and Fe(III), and the added Fe 3+ Li in brine + The molar ratio of n(Fe / Li)≈0.5.

[0040] Add FeCl to a co-extractant consisting of 20% (v / v) isooctyl alcohol and 80% (v / v) tributyl phosphate 3 ·6H 2 O dissolves to obtain the co-extractant oil phase of loaded Fe(III), and the added Fe 3+ Li in brine + The molar ratio of n(Fe / Li)≈1.5. Under the condition of O / A ratio of 1:1, the oil loaded with Fe(III) is relatively acid...

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Abstract

The invention discloses a co-extraction method of boron and lithium in brine. A mixed extraction system is used to extract boron and lithium in brine synchronously, so as to realize the separation of boron and lithium from a brine matrix. Then, the lithium and boron in the organic phase are back-extracted by using an acidic solution and an alkaline solution, respectively, so as to realize the separation between boron and lithium. The lithium-containing back-extraction liquid is concentrated and then cooled and crystallized to prepare lithium chloride or precipitated to prepare lithium carbonate. The boron-containing back-extracted liquid is directly concentrated and crystallized to prepare borax or concentrated and crystallized after acidification to prepare boric acid. The method only involves conventional separation and enrichment operations, has a simple process and a closed cycle, and realizes efficient recovery of boron and lithium. In addition, due to the simultaneous co-extraction of boron and lithium, on the basis of simplifying the operation and process steps, the problems of low extraction rate and poor stability of the organic phase caused by the mutual interference of the boron extraction and lithium extraction organic phases during the step-by-step extraction of boron and lithium are solved.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of brine resources, and in particular relates to a co-extraction recycling method of boron and lithium in underground brine containing boron and lithium, salt lake brine, oil field water and the like. Background technique [0002] my country is rich in lithium-containing underground brine, salt lake brine, oil and gas field water and other brine resources. The comprehensive recovery and utilization of related resources such as lithium in brine can not only bring considerable economic benefits, but also have great significance for the development of related industries. It is worth noting that brine usually contains a certain amount of boron, because boron is easy to form borax or boric acid with low solubility, which will seriously affect the process of comprehensive utilization of brine resources or product quality. At the same time, if the abundant boron resources are not recycled, it wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B26/12C22B3/40C01B35/10C01B35/12
CPCC01B35/1081C01B35/124C22B26/12C22B3/409Y02P10/20
Inventor 余晓平邓天龙范学兵王欢郭亚飞王宁军唐兵贾晓华张思思
Owner TIANJIN UNIV OF SCI & TECH
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