39results about How to "Fewer stages of extraction" patented technology

The invention relates to a method for extracting uranium and thorium from a southern ionic rare-earth lixivium, which is characterized by comprising the following steps: (1) carrying out uranium and thorium extraction separation by using a 15-25 vol% naphthenate-15-25 vol% octanol or isooctanol-50-70 vol% kerosene extractant and a southern ionic rare-earth lixivium in a volume ratio of (0.5-5):1; and (2) carrying out back extraction on the loaded organic phase obtained in the step (1) and a 2-5 mol / L sulfuric acid, hydrochloric acid or nitric acid solution in a volume ratio of (0.1-10):1, wherein the organic phase after the back extraction returns to the step (1) for repeated use, and the water phase, which is the solution with enriched uranium and thorium, is used for recycling uranium and thorium. The method provided by the invention can selectively separate uranium and thorium from the rare-earth lixivium, has the advantages of fewer extraction stages, simple technique, favorable separating effect, no influence on subsequent rare-earth separation technique, and high extraction ratio of uranium and thorium.

The invention discloses a new method for separating pantoprazole enantiomers by reaction extraction, and a preparation method of new chiral pure pantoprazole. Racemic pantoprazole can be separated by biphasic recognition chiral extraction technology, and water soluble beta-cyclodextrin and tartaric acid ester are respectively used as chiral extractants in aqueous and organic phases. The invention discloses preparation methods of the aqueous and organic phases and repeated usage methods of the aqueous and organic phases. The extraction system has a very good separation performance on the racemic pantoprazole, distribution coefficients (kR and kS) are respectively 1.56 and 2.15, and separation factor (alpha) can reach 1.38.

The invention relates to a method for extracting vanadium from ironmaking waste slag of vanadium iron ores. The method comprises the following steps: a. vanadium is leached out of ironmaking waste slag of vanadium iron ores by using dilute sulfuric acids; b. leach solution uses ethylene glycol, glycerin, glucose or sucrose as extraction promoters so as to complex vanadium; c. the pH value of the solution is adjusted, and mixed extracting agents are used for extraction; d. organic phase back extraction is extracted by using dilute sulfuric acids; e. ammonia water is used to adjust the pH valueof the back extraction solution so as to deposit vanadium; f. the deposit is calcined for obtaining vanadium pentexide products with high purity. In the process, no harmful gases such as Cl2 and HCl,etc. are generated, and due to the adoption of ethylene glycol, glycerin, glucose or sucrose to treat the leach solution, no impurity ions are added in the solution; the use of the ammonia water deposition can improve the product purity, and the total extraction rate of vanadium reaches more than 90 percent.

The invention relates to a method for extracting boron with the combination of solvent extraction-ion exchange adsorption. According to the method, boric acid of relatively low content is extracted from old brine of a magnesium-containing salt lake after acidification boron precipitation; the energy consumption can be effectively reduced as an extraction procedure with relatively small grade numbers is adopted, and the use amount of an extraction agent is reduced; after extraction, an ion exchange adsorption procedure is performed, and the trace boron element is removed by using an ion exchange adsorption method with high selectivity, so that the boron extraction grade number is effectively reduced, and the energy consumption is reduced; as a novel mixed extracting agent system is adopted, the single-grade extraction rate is high, and the solution loss is small. The method can be implemented under the condition of low energy consumption, the boron of low content in old brine after acidification boron precipitation of the salt lake can be effectively extracted, the extract is a pure boron-containing solution, a high-quality boron product can be prepared, the boron resource can be sufficiently utilized, the quality of a later magnesium salt product is greatly improved, comprehensive development and utilization of the old brine after acidification boron precipitation of the salt lake are achieved, and the economic benefits are remarkably increased.

The invention provides a method for performing extraction separation on cobalt and nickel by using a microfluid technology. The method comprises the following steps of: uniformly mixing an extraction agent and diluent which are subjected to homogeneous phase saponification by using a mixed material liquid of Co<2+> and Ni<2+>, using 2-ethyl cthylhexyl phosphonate mono 2-ethyl cthylhexyl ester as the extraction agent and using No.260 solvent oil and using the extraction agent and the diluent as an oil phase; introducing the water phase and the oil phase into a micro-reactor by virtue of two flow pumps; mixing the two phases in the micro-reactor and performing extraction reaction at 25-50 DEG C; and collecting a product at an outlet of the micro-reactor and standing for separating the phases to ensure that Co<2+> enters the oil phase and Ni<2+> stays in the water phase so as to realize extraction separation of cobalt and nickel. According to the method, continuous flow micro-reactor with an enhanced hybrid channel structure is adopted, the extraction separation of cobalt and nickel is carried out, and the reaction time is shortened to be within a micro-second level range, so that single-level cobalt extraction efficiency is obviously improved, and the extraction levels are reduced; and moreover, standing layering on the water phase and the oil phase can be quickly carried out without any emulsion phenomenon.

The invention discloses a method for recovering titanium from waste hydrochloric acid generated in production of titanium dioxide by a chlorination process. The method comprises the following steps of: carrying out extraction reaction by using a countercurrent contact mode of the titanium dioxide and waste hydrochloric acid in production of the titanium dioxide by the chlorination process, extracting the titanium in the hydrochloric acid into an organic phase and obtaining hydrochloric acid and an organic phase of negative titanium; adopting acid liquor added with hydrogen peroxide as reverse extraction liquor, carrying out reverse extraction according to the countercurrent contact mode, reversely extracting the titanium from the organic phase of the negative titanium into a water phase and obtaining titanium-containing solution and an organic phase. The method disclosed by the invention has the advantages that the characteristic of low-temperature selective extraction is achieved, the extraction time is short, the saturation capacity of extraction is large and the number of extraction stages is less; recovery and utilization of resources such as the titanium and the hydrochloric acid are realized, the emission of the waste acid is reduced, the reutilization of the resources is realized and the environmental pollution is eliminated.

The invention discloses a method for comprehensively recovering nickel and magnesium in a bio-leaching process of high-magnesium low-nickel sulfide ore. The method comprises the following steps: treating the bio-leachate of high-magnesium low-nickel sulfide ore through an ion exchange resin column to adsorb nickel ions, and enabling the magnesium-rich solution to flow out; desorbing residual magnesium ions in the ion exchange resin by use of low-acidity sulfuric acid, desorbing nickel ions in the ion exchange resin by use of high-acidity sulfuric acid, and returning the nickel ion desorption solution to the yard; and when the mass concentration of Mg and Ni in the leachate of the yard is lower than 5, extracting nickel with Versatic 10 and performing back extraction of an organic phase to obtain a nickel-rich solution. According to the method, by increasing the nickel-magnesium concentration ratio and reasonably matching the technological parameters, nickel and magnesium are effectively separated, and a recovery method of nickel and magnesium in bio-leachate is realized.

The invention belongs to the technical field of extraction and separation and particularly relates to a method for increasing extraction efficiency of copper in a water solution. The method particularly comprises the steps of: adding a citrate with mole number equivalent to that of copper in a copper-containing solution of a strong acid system or adding a neutralizing reagent in a copper citrate solution system, regulating pH of the solution to 1.5-5; preparing an oxime extracting agent into a required organic phase by using kerosene according to the difference of concentrations of the copper in the water solution; and mixing the organic phase with the copper-containing solution, stirring and extracting for realizing efficient extraction of the copper. According to the invention, by using the citrate as a pH buffer agent, acid generated in a water phase in an extraction process is buffered by citrate radicals, the activity of hydrogen ions in the solution is reduced, therefore, the continuous extraction of the copper is facilitated; and because the copper extraction efficiency is high and the extraction stage number is reduced, the investment, the occupation area and the operation and maintenance cost of equipment are greatly lowered in practical use,.

The invention discloses a method for non-saponification extraction and separation of light rare earth elements. After a compound extraction agent consisting of acid phosphorus type extraction agent, alkaline amine type extraction agent and solvent oil is mixed with phosphate solvent or organic alcohol solvent at 30-70 DEG C, chlorinated light rare earth liquid is extracted and separated; and the water washing and the hydrochloric acid reverse extraction are performed to finally realize the separation of La, Ce, Pr and Nd; and a mixed organic phase after the reverse extraction is returned to an extraction tank for recycling. The method pretreats the mixed organic phase consisting of the compound extraction agent and the solvent, so that such defects as high viscosity, weak mobility, easy emulsification and long phase splitting time are overcome; the method has no need to saponify the acid phosphorus type extraction agent, so that no alkali liquor consumption and no waste water emission in the extraction process are realized, but the separation capacity of a saponification extracting agent system is achieved, and the extraction grade is reduced compared with that needed by the saponification extracting agent system; and the method is a rare earth element separation process with economy and high efficiency.