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

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 value of 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 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 relates to a method for extracting and separating beryllium. Beryllium-containing dosage liquor is a sulfuric acid solution containing beryllium ions, wherein the concentration of the beryllium ions is 0.2-30g/L. The method is characterized in that the method comprises the steps of: (1) a naphthenic acid-alcohol or isooctanol-kerosene organic phase is uniformly mixed with the beryllium-containing dosage liquor; an alkaline solution is added to the mixed liquid, such that the pH value of the liquid is 5-8; (2) an acidic solution is added to the organic phase obtained in the step (1) for stripping impurities, such that an organic phase which is an impurity-removed beryllium-containing organic-phase solution is obtained; and (3) an alkaline solution is added to the organic phase obtained in the step (2) for stripping beryllium, such that a water phase which is an impurity-removed beryllium-containing solution is obtained; and the organic phase is delivered back to the step (1) and is reused. With the method provided by the invention, beryllium can be selectively separated from impurities such as iron and aluminum. The extraction stages are few, the process is simple, a separation effect is good, and a beryllium recovery rate is high.

The invention discloses a method for separating ferrum and vanadium in vanadium pickle liquor. The method comprises the following steps that Na2SO3 is added into the vanadium pickle liquor, stirring is conducted, and a reduction reaction is conducted at the temperature of 30-75 DEG C for 20-120 min, so that reduction liquor is obtained; the pH value of the reduction liquor is regulated to 1.0-2.5 by adding alkali liquor, so that emulsion is obtained; solid-liquid separation is conducted on the emulsion, so that an extracted stock solution and slag are obtained; a mixed extraction agent and the extracted stock solution are mixed according to the volume ratio of (0.2-1):1, and stirring is conducted, so that a mixed phase is obtained; and standing phase splitting is conducted on the mixed phase, so that a vanadium-carrying organic phase and ferrum-containing raffinate are obtained, wherein the mixed extraction agent is prepared by mixing an acid phosphorous extraction agent, an alkaline amine extraction agent and sulfonated kerosene. According to the method for separating the ferrum and the vanadium in the vanadium pickle liquor, different extraction agents are selected to form a mixed system, and through the characteristics of the different extraction agents, the mixed system can have better extraction capacity and selectivity. The technological process is simple, agent consumption is low, and the ferrum and the vanadium in the vanadium pickle liquor can be separated efficiently.

The invention discloses a method of preparing high-purity nickel sulfate from electrolytic manganese sulfide slag. The method comprises the following steps of (1) crushing and sieving; (2) oxidizing and leaching; (3) calcium removal; (4) manganese removal; (5) synchronous extraction of cobalt and nickel: taking a solution rich in cobalt, nickel and magnesium, and adding a third organic extractant formed by mixing saponified neodecanoic acid with sulfonated kerosene for extraction to obtain an organic phase rich in the cobalt and the nickel and a magnesium-contained aqueous phase; (6) cobalt removal: taking the organic phase rich in the cobalt and the nickel, adding dilute sulfuric acid for reverse extraction to obtain a cobalt-nickel sulfuric acid solution and a neodecanoic acid organic phase, separating out the cobalt-nickel sulfuric acid solution, and adding a fourth organic extractant formed by mixing saponified P507-Cyanex301 with sulfonated kerosene for extraction to obtain a cobalt-rich organic phase and a nickel sulfate solution; and (7) preparation of the high-purity nickel sulfate. The method has the advantages that the method is simple and feasible, leaching of nickel sulfate can be realized, and production of hydrogen sulfide gas, use of an iron precipitation process and a method of removing calcium and magnesium ions with precipitation of fluorine ions can be avoided.

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 high-purity lithium chloride extraction device. The high-purity lithium chloride extraction device comprises a filter press, a blending tank, an extraction system, a washing system, a reverse extraction system, a deironing system and an oil removal system which are sequentially connected through a pipeline, the blending tank is used for acid regulating treatment, and the extraction system, the washing system and the reverse extraction system are respectively formed by connecting multiple stages of centrifugal extractors in series. The reverse extraction solution outlet end of the reverse extraction system is connected with the washing system, the organic phase output end of the reverse extraction system is connected with a saponification system, and the saponification system is connected with the extraction system. A circulating loop is formed by the extraction system, the washing system, the reverse extraction system and the saponification system. The device is further provided with a data analysis system, and the work positions of the abnormal centrifugal extractors can be automatically switched to a standby centrifugal extractor through the system. Variable-frequency closed-loop flow control systems are arranged at the material input ends of all the systems in the circulating loop for obtaining the precise flow-input phase ratio through timely adjustment. The device is high in extraction efficiency, short in phase balance setting time, small in solvent needing amount, low in solvent consumption and continuous and reliable in process.

The invention relates to a method of utilizing V5+ to extract and gather a vanadium-containing solution. The method includes: adjusting pH value of vanadium-containing material leaching stoste to below 7 to generate precipitate or floccule; adding an oxidizing agent while stirring for reaction, wherein when a reaction solution gradually becomes crineous, vanadium ions in the reaction solution are oxidized into V5+; filtering the reaction solution, wherein obtained filtrate is extraction stoste; adjusting pH value of the extraction stoste to below 7, adopting an extraction organic phase with a pH value equal to the pH value of the extraction stoste to perform countercurrent extraction on V5+ in the extraction stoste to obtain an organic phase rich in V5+ and extraction residual water, subjecting the organic phase rich in V5+ to reverse extraction through a stripping agent solution to obtain reverse water rich in V5+, and storing the reverse water to obtain the vanadium-containing solution extracted and gathered by utilizing V5+. Valent state of V5+ is utilized to extract, purify and gather the vanadium-containing solution, so that the valent state does not need to be changed repeatedly, and vanadium recovery rate is high.

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 discloses a method of preparing high-purity cobalt sulfate from electrolytic manganese sulfide slag. The method comprises the following steps of (1) crushing and sieving; (2) oxidizing and leaching; (3) calcium removal; (4) manganese removal; (5) synchronous extraction of cobalt and nickel; (6) cobalt recovery: taking a cobalt-nickel rich organic phase, adding dilute sulfuric acid for reverse extraction to obtain a cobalt-nickel sulfuric acid solution and a neodecanoic acid organic phase, separating out the cobalt-nickel sulfuric acid solution, adding a fourth organic extracting agent formed by mixing saponified P507-Cyanex301 with sulfonated kerosene for extraction to obtain a cobalt-rich organic phase and a nickel sulfate solution, separating out the cobalt-rich organic phase, and adding sulfuric acid for reverse extraction to obtain a high-purity cobalt sulfate-rich solution and a P507-Cyanex301 organic phase; and (7) preparation of the high-purity cobalt sulfate. The method has the advantages that the method is simple and feasible, leaching of cobalt sulfate can be achieved, and production of hydrogen sulfide gas, use of an iron precipitation process and a method of removing calcium and magnesium ions through fluorine ion precipitation can be avoided.

The invention provides a flocculation extraction separation method of zinc and cobalt ions, and relates to the technical field of extraction separation. The flocculation extraction separation method of zinc and cobalt ions comprises the following steps: leaching zinc-cobalt-containing waste residue with nitric acid or sulfuric acid to obtain a leachate; adding zinc powder to the leachate, and removing impurity components to obtain a purified liquid; adjusting the pH of the purified liquid with an alkaline reagent to obtain a flocculent suspension, mixing the flocculent suspension with an extracted organic phase containing P204, obtaining a loaded organic phase and a raffinate through an extraction reaction, and using the raffinate to recover cobalt; reversely extracting the loaded organicphase to obtain a zinc ion solution, and then recovering zinc. The alkaline reagent is added to convert metal ions to a hydroxide flocculent precipitate; the hydroxide flocculent precipitate has a large specific surface area, high specific surface energy and chemical reactivity, and can rapidly undergo an extraction reaction with acidic P204, the single-stage reaction rate is high, the extractionreaction is thorough, the amount of P204 is small, the separation effect is good, and the application prospect is broad.

The invention discloses a method of extracting lithium isotope <6>Li with a centrifugal extraction machine. A device includes an extraction section, an alkali washing section, and a back extraction section. The lithium isotope extraction device in the invention is a novel and high-effective centrifugal extraction device, when the device is combined with a technology of extracting the lithium isotope through a solvent extraction method, stage efficiency and separation effect are greatly improved, the number of extraction stages is reduced, processing load is increased, and recovery rate of an extraction agent is increased. The method solves the problems of high cost, low processing load and difficulty in separation in the prior art, and has excellent market application prospect.