Extraction system, extraction method and application of separating calcium and extracting lithium and boron from calcium-containing brine with secondary amide/alkyl alcohol composite solvent
A composite solvent and secondary amide technology, which is applied in the field of extraction systems for separating calcium to extract lithium and boron, can solve the problems of large precipitation treatment capacity, low utilization rate of atom economy, long process flow, etc.
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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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