Extraction system and method for separating calcium and extracting lithium from calcium-containing brine through secondary amide/alkane compound solvent and application thereof

A composite solvent and secondary amide technology, which is applied in the field of extraction systems for separating calcium from calcium-containing brine with composite solvent to extract lithium, can solve the limitation of the decrease in the mass ratio of calcium to lithium, the failure to develop lithium resources, and the difficulty of separation and separation, etc. problems, to achieve the effect of improving viscosity, easy production, and simple molecular structure

Active Publication Date: 2020-02-11
XIANGTAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Li Bing and others evaporated the oilfield water to a specific gravity of 1.40-1.54, and frozen it at 0-30°C for 3-15 days to obtain lithium-rich brine (CN103508472A). This method takes a long time and the decrease in the mass ratio of calcium to lithium is limited.
[0004] In other methods for separating calcium in brine, Qin Xiaoming et al. used chelating cation exchange resin columns to remove metal cations above divalent in lithium-containing solutions at a pH of 10-12 (CN108840354A), and Guo Dingjiang et al. used nanofilters to remove high salts. Calcium and magnesium impurities in lithium chloride mixed solution (CN106048218A) and Cao Naizhen etc. utilize extraction method to use P204 as extraction agent, sulfonated kerosene as sustained release agent to remove calcium and magnesium ions in lithium-rich solution (CN105712383A), t

Method used

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  • Extraction system and method for separating calcium and extracting lithium from calcium-containing brine through secondary amide/alkane compound solvent and application thereof
  • Extraction system and method for separating calcium and extracting lithium from calcium-containing brine through secondary amide/alkane compound solvent and application thereof
  • Extraction system and method for separating calcium and extracting lithium from calcium-containing brine through secondary amide/alkane compound solvent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0051] Example 1

[0052] Li in a calcium-containing brine + And Ca 2+ The content is 3.29g / L and 187.85g / L, the mass ratio of calcium to lithium is 57.10:1, of which Na + , K + , Mg 2+ , Cl - And B 2 O 3 The content is 2.90, 19.69, 2.14, 377.80 and 1.56g / L respectively, and the brine density is 1.41g / cm 3 , The brine pH value is 2.5, and the ion concentration in the brine is prepared according to the composition of the brine from an oilfield in Nanyishan, Qinghai Qaidam Basin, and the oilfield brine is degreasing in advance with an oil-water separator. Take 6mL of this kind of brine in a 100mL conical flask, and then add 24mL N-isooctylisovaleramide as the extractant and 6mL tetradecane as the diluent. The diluent accounts for 20% of the volume of the organic phase. The volume ratio of phase to calcium brine is 5:1. Put the magnet in the Erlenmeyer flask, insert the matching air condenser at the mouth of the flask to prevent the liquid from splashing out, put it in the DF-101S t...

Example Embodiment

[0058] Example 2

[0059] Take 24mL of N-pentylisononylamide as the extractant and 6mL of 260# solvent oil as the diluent in a 100mL conical flask, the diluent accounts for 20% of the volume of the organic phase, and then add 6mL of Example 1 For calcium-containing brine, the volume ratio of organic phase to calcium-containing brine is 5:1. Put the magnet in the Erlenmeyer flask, insert the matching air condenser at the mouth of the flask to prevent the liquid from splashing out, put it in the DF-101S type heat-collecting thermostatic heating magnetic stirrer, mix, stir and extract at 20℃ for 30min. Then the mixed liquid was transferred to a 100mL plastic test tube, and centrifuged at 4000r / min for 10min in an LD5-10 benchtop centrifuge. The two-phase interface was clear. After phase separation, the extracted organic phase and the remaining brine phase were obtained. Transfer the loaded organic phase to another 100 mL conical flask, add deionized water according to the volume ra...

Example Embodiment

[0064] Example 3

[0065] Take 30mL N-pentylisononylamide as the extractant and 30mL dodecane (isomer mixture) as the diluent in a 100mL conical flask, the diluent accounts for 50% of the volume of the organic phase, and then Add 6 mL of the calcium-containing brine in Example 1, the pH of the brine is 6.6, and the volume ratio of the organic phase to the calcium-containing brine is 10:1. Put the magnet in the Erlenmeyer flask, insert the matching air condenser at the mouth of the flask to prevent the liquid from splashing out, put it in the DF-101S type heat-collecting thermostatic heating magnetic stirrer, mix, stir and extract at 20℃ for 30min. Then the mixed liquid was transferred to a 100mL plastic test tube, and centrifuged at 4000r / min for 10min in an LD5-10 benchtop centrifuge. The two-phase interface was clear. After phase separation, the extracted organic phase and the remaining brine phase were obtained. Transfer the loaded organic phase to another 100mL conical flask...

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Abstract

The invention discloses an extraction system and method for separating calcium and extracting lithium from calcium-containing brine through a secondary amide/alkane compound solvent and application thereof. The extraction system contains secondary amide and alkane which are each composed of one compound or a mixture of two or more compounds, the total numbers of carbon atoms in molecules are 12-18and 9-18, and the solidifying point of the extraction system is lower than 0 DEG C. When the volume ratio of an organic phase or a brine phase is (1-10):1, the density of the brine is 1.30-1.56 g/cm<3>, the pH value of the brine is 1-7 and the temperature is 0-50 DEG C, single-stage or multi-stage counter-current extraction is performed, low-calcium-lithium-ratio water phase is obtained through back extraction, and lithium chloride, lithium carbonate and lithium hydroxide are obtained through concentration, impurity removal and preparation. The extraction system has the advantages that a secondary amide extraction agent is simple in molecular structure and easy to produce, alkane improves the viscosity and other properties of the compound solvent, the Li+ multi-stage extraction rate is high, the lithium and calcium separating coefficient is high, the acid and alkali consumption is greatly reduced when back extraction is performed with water, the extraction separation technological process is short, the extraction system is low in dissolving loss and suitable for oil field brine development.

Description

technical field [0001] The invention relates to a method for extracting lithium from calcium-containing brine, in particular to an extraction system, an extraction method and an application thereof for separating calcium and extracting lithium from calcium-containing brine with a composite solvent. Background technique [0002] There is abundant underground brine in oil fields in the Nanyishan area in the west of the Qaidam Basin in Qinghai, my country. Its resource reserves are comparable to those of the salt lake reserves in the Qaidam Basin. It is a rare multi-element coexistence super-large deposit in the world and has great industrial development value. . Among them, there are many useful components such as potassium, boron, lithium and iodine, and the content is high. The resource occurrence status is quite different from that of the developed salt lake resources. It belongs to the calcium chloride type brine in the Sulin classification, showing high salinity, high calc...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B26/20C25B1/34C01D15/02C01D15/04C01D15/08C22B3/40
CPCC01D15/02C01D15/04C01D15/08C22B26/12C22B26/20C25B1/34C22B3/402Y02P10/20
Inventor 杨立新李海博李聪刘长周钦耀
Owner XIANGTAN UNIV
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