34results about How to "Implement selective extraction" patented technology

The invention provides a method for extracting lithium from salt lake brine, comprising the following steps: 1) mixing organic phase composed of salt lake brine, extracting agent and extracting medium with synergist, extracting the mixture and collecting the organic phase; 2) mixing the organic phase in step 1 with hydrochloric acid solution and carrying out back-extraction on the mixture, collecting aqueous phase to obtain aqueous solution of Lithium-ion; the step is characterized in that the extracting medium is hydrophobic ionic liquid. Compared with the traditional method for extracting lithium from salt lake brine with solvent gasoline as the medium, the method of the invention employs green and environmental-friendly ionic liquid as the medium; as a result, lithium salt extraction efficiency is improved, back-extraction acidity is lowered, what is more important is that environmental pollution and equipment corrosion due to use of a great deal of volatile organic solvent and high-concentration hydrochloric acid are avoided. In addition, the organic phase of the invention features fine cyclic applicability, thus greatly reducing production cost for extracting lithium from the salt lake brine.

The invention provides a method for selectively recycling positive electrode materials for lithium ion batteries. The method comprises the following steps: carrying out transformation processing aftermixing the recycling positive electrode materials for lithium ion batteries with an additive; leaching an obtained transformation product with a leaching agent, and carrying out solid-liquid separation to obtain a lithium-rich solution and a solid slag; and preparing the obtained lithium-rich solution into a lithium salt and the obtained solid slag into a transition metal salt. According to the method, recycling of valuable metals in the positive electrode materials for lithium ion batteries is realized by using in situ crystal transformation and mild leaching methods, particularly, selectiveextraction for lithium is realized, the recycle rate reaches 95% or above, and the recycle rate of other valuable metals such as nickel, cobalt and manganese reaches 98% or above; the method is shortin flow, other impurity ions are not introduced, the product purity is high, secondary pollution and liquid waste disposal can also be avoided, the recycle cost is saved, and the method is easy to realize industrial application.

The invention relates to a method for extracting and separating a lithium isotope aqueous solution and belongs to the technical field of solvent extraction. In the method, hydrophobic naphthisoazine and hydrophilic ionic liquid respectively serve as an extracting agent and a synergist; and naphthisoazine, the ionic liquid and lithium ions form a stable ion associated matter under an alkaline condition, lithium ions enter into an organic phase through aqueous phase extraction and an obvious isotope separation effect is generated. The method comprises the following steps of: regulating the alkalinity of a lithium hydroxide solution, respectively adding the extracting agent, the synergist and the hydrophilic ionic liquid serving as an extracting medium, oscillating at normal pressure and normal temperature, standing still for layering, collecting the organic phase, and adding sodium sulfate into the organic phase to carry out lithium salt back extraction so that the lithium ions come back to the aqueous phase, thereby realizing the selective extraction and high-efficiency enrichment of lithium isotopes.

The invention belongs to the technical field of electrochemical lithium extraction, and in particular relates to an electrochemical lithium extraction method which is based on a "rocking chair" type structural electrode system and can realize high-selectivity and low-energy-consumption extraction of dissolved thin lithium resources. According to the ''self-driven'' electrochemical lithium extraction method based on the ''rocking chair'' type structural electrode system provided by the invention, based on a current electrochemical lithium extraction method based on the ''rocking chair'' type structural electrode system, the ''self-driven'' process is used for the electrochemical lithium extraction method for the first time, the self drive (and even energy recovery) process lithium extraction is performed by using the self potential difference between electrodes in different states in the ''rocking chair'' type structural electrode system, the two electrodes firstly use the self smallerpotential difference for lithium extraction, then an external electric field is applied for further lithium extraction, so that the energy consumption in the lithium extraction process is effectivelyreduced, the synchronous improvement of the electrode-to-lithium exchange capacity and selectivity coefficient is realized, and the method has significant technical advantages.

The invention provides a method for recovering lithium in lithium-containing battery waste materials. The method comprises the following steps of (1) mixing the lithium-containing battery waste materials with a salt water solution to obtain raw material slurry; performing electrochemical treatment on the raw material slurry; performing solid-liquid separation; obtaining liquid of lithium-containing purified liquid; (2) regulating the pH of the lithium-containing purified liquid in the step (1) to be 7 or higher; adding carbonates for lithium precipitation reaction; performing solid-liquid separation after the reaction; obtaining solid of lithium carbonate. The method provided by the invention has the advantages that the flow process is short; the operation is simple; the reaction process is green and clean; no waste is discharged in the integral flow process; the soaking- precipitation-separation process of a conventional process is realized through one step of the electrochemical processing; the production cost is reduced; the lithium recovery selectivity is as high as 99 percent; the single time recovery rate reaches 95 percent or higher; the obtained product purity reaches the battery grade lithium carbonate requirements; meanwhile, the high-value conversion of other metal ingredients is realized.

The invention discloses a processing method of donkey-hide gelatin and ginger tea. The processing method is characterized in that crude trypsin is extracted by processing pig pancreas, so that the activity is better and the benefit for reducing the production cost is achieved; the donkey-hide gelatin is hydrolyzed by the crude trypsin to obtain small-molecular peptides with certain physiological activity, so that the digestion and the absorption by a human body are easier and the effects are exerted more easily; and continuous extraction of effective components of fresh ginger is realized by asubcritical water extraction mode, and the cavitation effect of ultrasonic wave is utilized to generate an enhancing action for extracting subcritical water.

The invention discloses a method for enriching and extracting gallium from alumina seed precipitation mother liquor on the basis of a biomass material. The method comprises the following steps that the biomass material is taken as an adsorbent, and the biomass material is a persimmon peel-based imprinted composite material obtained by modifying persimmon peel through an ion imprinting technology; and the persimmon peel-based imprinted composite material is loaded into two stages of dynamic adsorption columns, and gallium in the alumina seed precipitation mother liquor is selectively adsorbed and desorbed through a gallium extraction dynamic adsorption column 1 and a gallium enrichment dynamic adsorption column 2 to obtain a gallium-rich electrolytic stock solution. According to the method, the waste biomass persimmon peel serves as a material, the adsorbent is obtained through surface ion imprinting modification, selective extraction of gallium in the alumina seed precipitation mother liquor is achieved through gallium ion specific recognition sites on the surface of the adsorbent, and the method has the advantages of being low in gallium enrichment cost, high in efficiency and the like and has good economic benefits and environmental benefits.

A low-cost and low-acid-consumption laterite-nickel ore leaching method comprises the following steps that (1) limonite type laterite-nickel ore and a sulfuric acid solution are mixed and subjected to size mixing, then the mixture is transferred into a high-pressure kettle for high-pressure acid leaching, and leaching liquid and leaching residues are obtained; (2) adjusting the pH value of the leaching solution to 3-4 by adopting modified humus soil to obtain iron-aluminum slag and a neutralized solution; the modified humus soil is obtained after humus soil type laterite-nickel ore is subjected to heat treatment; and (3) adjusting the pH value of the neutralized solution to 7.0-8.5 by using alkali, and carrying out solid-liquid separation to obtain the nickel cobalt hydroxide. According to the method, the humus soil type laterite-nickel ore with high magnesium content is subjected to heat treatment modification, the modified humus soil type laterite-nickel ore can serve as a neutralizing agent to neutralize free acid in limonite type laterite-nickel ore leaching liquid, the free acid can be effectively neutralized, and the content of magnesium in the limonite type laterite-nickel ore leaching liquid is increased; and valuable metals such as nickel and cobalt in the humus type laterite-nickel ore can be leached by fully utilizing the residual acid, so that the acid consumption of a unit nickel product is reduced.

The invention relates to the technical field of rare earth element recovery, in particular to a method for selectively leaching rare earth elements from red mud. Comprising the following steps: leaching the red mud with an oxalic acid solution, and carrying out solid-liquid separation to obtain oxalic acid leaching residues and an oxalic acid leaching solution; roasting the oxalic acid leaching residues, leaching with a diluted hydrochloric acid solution, and carrying out solid-liquid separation to obtain hydrochloric acid leaching residues and a hydrochloric acid leaching solution; and leaching the hydrochloric acid leaching residues by using a sulfuric acid solution, and then carrying out solid-liquid separation to obtain a leaching solution rich in rare earth and sulfuric acid leaching residues. According to the method for extracting the rare earth elements in multiple stages through oxalic acid, diluted hydrochloric acid and sulfuric acid, the technical purposes that iron extraction, calcium removal and selective leaching of the rare earth elements from the red mud are achieved, the leaching rate of the rare earth elements is 80% or above, and the leaching rate of iron, aluminum and silicon elements is 20% or below are achieved.

The invention discloses a method and a kit for rapidly and selectively detecting added aluminum in a food. According to the method, the added aluminum in a sample is extracted through diethylenetriamine pentaacetic acid (DTPA) complexing, so that selective extraction of the added aluminum in the food is realized; then bismuth ions in a bismuth nitrate solution are used for carrying out competitivecomplexing of DTPA to release aluminum ions; the free aluminum ions, in an ethylenediamine-hydrochloric acid buffer solution, react with chrome azurol S to generate blue-green quaternary micelles inthe presence of TritonX-100 and cetyl trimethyl ammonium bromide; and qualitative comparison with a colorimetric card is carried out. Meanwhile, the concentration of the trivalent aluminum ions in thesample can be estimated according to the known concentration on the colorimetric card, thereby realizing semi-quantification. The kit can meet field rapid detection requirements of food aluminum additives, and is suitable for family detection and field law enforcement detection, particularly flour food detection.

The invention provides a gas dilution device and method based on a selection technology. The gas dilution device based on the selection technology comprises a mixing tank, a quantitative ring and a gas separation unit, wherein the first switching module is used for enabling the input end of the quantitative ring to selectively communicate with first gas and second gas; the second switching module is used for enabling the output end of the quantitative ring to selectively communicate with the gas separation unit or the outside; the input end of a non-destructive detector is connected with the gas separation unit, and the output end of the non-destructive detector is connected with a third switching module; the third switching module is used for enabling the outlet of the non-destructive detector to be selectively connected with the mixing tank and the outside; third gas enters the mixing tank through a gas pipeline; and a metering module is used for metering the third gas. The gas dilution device meets the requirement of trace gas dilution.

The invention discloses a feed additive for sows at an early pregnancy period. The feed additive is prepared by the preparation method comprising the following steps of (1) treating raw materials: removing fine hair on the surfaces of fresh immature fructus momordicae and falling fructus momordicae, then adding fresh fructus momordicae stems and leaves, of which the weight is one fifth to one fourth of that of the fructus momordicae without the fine hair to obtain materials; (2) performing subcritical water extraction: breaking the materials obtained in step (1), adding deionized water of which the weight is the same as that of the materials, performing subcritical water extraction, wherein the extraction temperature is 120-160 DEG C, the pressure is 5-8MPa, and the extraction time is 10-15min, ending the extraction, performing pressure relief, and collecting extract liquid; and (3) performing concentration: concentrating the extraction liquid obtained in the step (2) to thick paste ofwhich the relative density is 1.10-1.15 at 70 DEG C, so that the feed additive is obtained.

The invention discloses a method for selective zinc immersion through cyclone classification-ionic liquid-ultrasonic cooperation, and belongs to the technical field of hydrometallurgy. The method comprises the steps of graded enrichment of zinc-containing dust mud, synthesis of ionic liquid and selective leaching of zinc. According to the method, the special-shaped hydrocyclone is used for pretreating the zinc-containing dust sludge to obtain fine-grain zinc-rich dust sludge, so that efficient leaching of zinc is facilitated, and meanwhile, opening and dispersing of floccules in the zinc-containing dust sludge are facilitated; the ionic liquid and ultrasonic synergistic leaching system has selective dissolving capacity on ZnO, the obtained zinc-containing leaching solution is high in purity, and the problems that components are complex, separation is difficult and the like in a traditional leaching system are solved.

The invention discloses a preparation method of codonopsis pilosula sections, which comprises the following steps: cleaning fresh codonopsis pilosula medicinal materials to remove impurities, cleaning, cutting the fresh codonopsis pilosula into sections, cleaning again, drying in a drying oven until the water content is lower than 10%, pulverizing the dried codonopsis pilosula, and drying again until the water content is lower than 5%, and obtaining codonopsis pilosula powder; and then performing supercritical extraction treatment on the codonopsis pilosula powder. A supercritical extraction technology is adopted for extracting the active ingredients of codonopsis pilosula, the extraction rate is remarkably superior to that of a traditional extraction technology, and the supercritical extraction technology has the advantages that extraction and separation can be completed at a time, the extraction efficiency is high, the active ingredients are well reserved, and no solvent is left. According to the supercritical extraction process disclosed by the invention, the components of an entrainer are optimized, so that the extraction rates of saccharides and glycosides are stable, and meanwhile, the extraction of alkaloid can be reduced.

The invention discloses aphrodisiacs used for sows at a copulation period. The aphrodisiacs is prepared by the following preparation method: 1) raw material treatment: removing villus on the surface of grosvenor momordica fruit for fresh and unripe grosvenor momordica fruit and dropped grosvenor momordica fruit; 2) subcritical water extraction: crushing the raw materials obtained in the last step,adding deionized water which is as heavy as the raw materials, performing subcritical water extraction at an extraction temperature of 120-150 DEG C for 10-15 minutes under a pressure of 5-8 MPa, releasing pressure after extraction is ended, and collecting an extracting solution; and 3) filtration: performing 0.45 mu m filtration on the extracting solution obtained in the last step, and performing sealing and storing, thereby obtaining the aphrodisiacs.

The invention discloses an electrochlorination extraction method for gold in gold-containing materials. The electrochlorination extraction method comprises an anode dissolution process and a cathode deposition process which are completed in a same reactor. The electrochlorination extraction method comprises the following steps of putting the gold-containing materials into an electrochemical reactor filled with an electrolyte with sodium chloride concentration of 0.1-3mol/L in a sheet, powder or particle form, and controlling the reaction temperature to be 25-99 DEG C, the current density to be0.01-3A/cm2, and the reaction time to be 1-6 hours; and after electrolysis is completed, collecting sediments of a cathode chamber and a cathode plate, washing and drying the sediments, and obtaininggold powder. The method has the remarkable advantages of being high in gold extraction efficiency, low in chemical reagent consumption, clean in process, simple and convenient in operation, short inflow and the like.

The invention discloses an aphrodisiac for sows in a breeding period. The aphrodisiac is obtained by a preparation method comprises the following steps: 1) raw material processing: taking fresh immature and fallen siraitia grosvenorii fruits, removing villi on surfaces of the siraitia grosvenorii fruits, adding 1/5-1/4 by weight of fresh siraitia grosvenorii stems and leaves; 2) subcritical waterextraction: crushing the raw materials obtained in the step 1, adding equivalent deionized water, extracting subcritical water at 120-150 DEG C under a pressure of 5-8 MPa for 10-15 min, finishing extraction, relieving pressure, and collecting extract; 3) filtration: filtering the extract obtained in the step 2 through 0.45 [mu]m, sealing and storing to obtain the aphrodisiac.

The invention provides a method for recycling a positive electrode material of a waste lithium cobalt oxide battery. The method comprises the following steps of adding a salt assistant and a reducing agent into the positive electrode material of the lithium cobalt oxide battery, roasting the obtained mixture in a reducing atmosphere, carrying out water leaching treatment on the roasted product, and carrying out solid-liquid separation to obtain a lithium-rich solution. According to the method, lithium in the positive electrode material of the lithium cobalt oxide battery can be efficiently transformed into water-soluble lithium salt at a relatively low temperature, effective separation of lithium from other components can be realized through water immersion treatment, and the method simplifies the production process, reduces the energy consumption and has potential industrial application value.

The invention discloses a feed additive for sows at an early pregnancy period. The feed additive is prepared by a preparation method comprising the following steps of (1) treating raw materials: removing fine hair on the surfaces of fresh immature fructus momordicae and falling fructus momordicae; (2) performing subcritical water extraction: smashing the raw materials obtained in the step (1), adding deionized water of which the weight is the same as that of the raw materials, performing subcritical water extraction, wherein the extraction temperature is 120-160 DEG C, the pressure is 5-8MPa,and the extraction time is 10-15min, when extraction is completed, performing pressure relief, and collecting extract liquid; and (3) performing concentration: concentrating the extract liquid obtained in the step (2) to thick paste of which the relative density is 1.10-1.15 at 70 DEG C, so that the feed additive is obtained.