Extraction system for extracting lithium and boron by separating calcium from calcium-containing brine by secondary amid/alkyl alcohol composite solvent, extraction method and application of extraction method

A composite solvent and secondary amide technology, which is applied in the field of extraction system for separating calcium to extract lithium and boron, can solve the problems affecting production cost and market competitiveness, low utilization rate of atomic economy, large amount of precipitation treatment, etc., and achieve structural Simple, easy stripping, low acid and alkali consumption effect

Active Publication Date: 2020-01-10
XIANGTAN UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from the above methods that the process of simultaneously extracting lithium and boron from brine is carried out separately according to different technical characteristics, and the process flow is long. The traditional method of calcium and magnesium removal has always had a large amount of precipitation treatment and low atomic economic utilization. Higher defects, which affect the production cost and market competitiveness of the product

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  • Extraction system for extracting lithium and boron by separating calcium from calcium-containing brine by secondary amid/alkyl alcohol composite solvent, extraction method and application of extraction method
  • Extraction system for extracting lithium and boron by separating calcium from calcium-containing brine by secondary amid/alkyl alcohol composite solvent, extraction method and application of extraction method
  • Extraction system for extracting lithium and boron by separating calcium from calcium-containing brine by secondary amid/alkyl alcohol composite solvent, extraction method and application of extraction method

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Experimental program
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Effect test

Embodiment 1

[0056] Li in a calcium-containing brine + , Ca 2+ and B 2 o 3 The contents are 2.92, 169.11 and 9.41g / L respectively, and the mass ratio of calcium to lithium is 57.91:1, of which Na + 、K + , Mg 2+ and Cl - The contents are 4.13, 14.46, 9.27 and 361.31g / L respectively, and the brine density is 1.39g / cm 3 , the brine pH value was adjusted to 1.7, and the ion concentration in the brine was prepared according to the brine composition of an oilfield in Nanyishan, Qaidam Basin, Qinghai. The oilfield brine was degreased with an oil-water separator in advance. Take 5mL of this kind of brine in a 100mL ground-necked Erlenmeyer flask, and then add 20mL of N-isooctyl isocaproamide and 5mL of 3,5,5-trimethylhexanol as the extraction agent, and the alkyl alcohol occupies the volume of the organic phase 20%, the volume ratio of organic phase to brine is 5:1. Put magnets in the Erlenmeyer flask, insert the matching air condenser into the mouth of the flask to prevent the liquid from...

Embodiment 2

[0063] Get 24mL N-pentyl isononamide and 6mL 2-propylheptanol as extractant in 100mL ground mouth Erlenmeyer flask, alkanol occupies 20% of organic phase volume, then add 3mL of the For calcium-containing brine, the volume ratio of organic phase to calcium-containing brine is 10:1. Put magnets in the Erlenmeyer flask, insert the matching air condenser into the mouth of the flask to prevent the liquid from splashing out, place it in a DF-101S collector type constant temperature heating magnetic stirrer, mix and stir at 20°C, and extract for 25 minutes. Then the mixed liquid was transferred to a 100mL plastic test tube, and centrifuged in an LD5-10 desktop centrifuge at a speed of 4000r / min for 10min. The interface between the two phases was clear. After phase separation, the loaded organic phase after extraction and the remaining brine phase were obtained. Transfer the loaded organic phase to another 100mL ground-mouth Erlenmeyer flask, add deionized water at a volume ratio of ...

Embodiment 3

[0069] Take 10mL of N-isobutylisonononamide (liquid after heating), 10mL of N-isooctylpentanamide and 5mL of 2-hexyldecanol in a 100mL ground-necked Erlenmeyer flask as the extraction agent, and the alkyl alcohol accounts for 20% of the volume of the organic phase. %, then add the calcium-containing brine in 5mL embodiment 1 therein, and the volume ratio of the organic phase to the calcium-containing brine is 5:1. Put magnets in the Erlenmeyer flask, insert the matching air condenser into the mouth of the flask to prevent the liquid from splashing out, place it in a DF-101S collector type constant temperature heating magnetic stirrer, mix and stir at 20°C, and extract for 30 min . Then the mixed liquid was transferred to a 100mL plastic test tube, and centrifuged in an LD5-10 desktop centrifuge at a speed of 4000r / min for 10min. The interface between the two phases was clear. After phase separation, the loaded organic phase after extraction and the remaining brine phase were o...

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Abstract

The invention discloses an extraction system for extracting lithium and boron by separating calcium from calcium-containing brine by a secondary amid/alkyl alcohol composite solvent, an extraction method and application of the extraction method. In the extraction system, secondary amid and alkyl alcohol serve as extracting agents for extracting lithium and boron correspondingly and consist of single compound or a mixture of more than two compounds; the total number of carbon atoms in the molecules is 12 to 18 and 8 to 20 correspondingly, and the freezing point of the extraction system is lessthan 0 DEG C. Single-stage or multi-stage countercurrent extraction is conducted under the conditions that the volume ratio of an organic phase to a brine phase is (1-10):1, the density of the brine is 1.30 to 1.56 g/cm<3>, the pH value of the brine is 0 to 7 and the temperature is 0 to 50 DEG C, an aqueous phase with low calcium-lithium ratio is obtained through back extraction, and lithium chloride, lithium carbonate, lithium hydroxide and boric acid are obtained respectively through concentration, impurity removal and preparation. The secondary amide is simple in molecular structure, and the lithium and the boron can be extracted simultaneously by the composite solvent improved by the alkyl alcohol; multi-stage extraction rate is high, back extraction is conducted by using water and acid and alkali consumption is greatly reduced; and the extraction separation flow is shortened, and the extraction system has small solution loss and is suitable for development of oilfield brine.

Description

technical field [0001] The invention relates to a method for extracting lithium and boron from calcium-containing brine, in particular to an extraction system, extraction method and application thereof for separating calcium and extracting lithium and boron 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 salin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/12C22B3/40C22B7/00C22B26/20C01B35/10C01D15/02
CPCC01B35/1045C01D15/02C22B7/005C22B26/12C22B26/20C22B3/409Y02P10/20
Inventor 杨立新周钦耀李聪刘长李海博
Owner XIANGTAN UNIV
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