115results about How to "Achieve selective separation" patented technology

The invention discloses a method for selectively extracting and recycling gallium, germanium and indium from sulfuric acid leach liquid of zinc displacement residues. The method includes selectively extracting the germanium from the sulfuric acid leach liquid of the zinc displacement residues by the aid of synergistic extraction systems comprising hydroxamic chelate extraction agents and acidic phosphorus type extraction agents; recycling acid from germanium extraction raffinate by the aid of a diffusion dialysis process and finely adjusting the germanium extraction raffinate until a pH (potential of hydrogen) value of the germanium extraction raffinate is appropriate; selectively extracting the gallium and the indium from the germanium extraction raffinate by the aid of synergistic extraction systems comprising hydroxamic chelate extraction agents and carboxylic acid extraction agents. The method has the advantages that the germanium, the gallium and the indium can be effectively separated from foreign metal ions of iron, zinc, cadmium, nickel, cobalt and the like; the germanium, the gallium and the indium are high in recycling rate, good germanium, gallium, indium and foreign matter separation effects can be realized, technological processes are short, the extraction agents are long in service life and low in loss, and the method is low in cost and easy to industrialize.

A novel technology is used for recycling iron and vanadium from calcium-rich or iron-rich steel slag. The invention relates to a metallurgical method of extracting vanadium, in particular to a method that extracts vanadium or iron from abandoned steel slag with multidisciplinary technologies. The technology has the following procedures: (1) The calcium-rich or iron-rich steel slag is crushed, the iron contained in the steel slag is recycled by magnetic separation, and the material that will correspondingly change low-valent vanadium is roasted into high-valent vanadium contained in the material, or the material is first roasted and then magnetic separated; (2) the material is soaked with 95-98 percentage concentrated sulfuric acid, and then solid-liquid separation is conducted; (3) the acidity of lixivium is adjusted, to make sure the pH of the lixivium is in 1.0 to 2.3, and the oxidation-reduction potential is -1000 to 200mv; (4) Extraction above grade two is adopted, the extraction phase ratio O/A is 1/6 to 1/1, and then the aqueous phase unloaded; (5) the organic washing is applied in the load to remove iron, and the washing agent used is sulphate; (6) 0.25M to 1.5M alkaline solution is adopted as a stripping agent for back-extraction, with a phase ratio of O/A 1/1 to 6/1, so as to deposit vanadium contained in solution. The invention is characterized by simple technology, low cost, small environmental pollution and high recovery ratio in the process of extracting vanadium and iron from calcium-rich or iron-rich steel slag.

The invention discloses a method for recycling valuable metal in a waste circuit board. The method includes the following steps that the waste circuit board is subject to smashing and reselection to prepare multi-metal powder; a dilute acid solution is added into the multi-metal powder, agitation leaching is carried out, filtering is carried out, and leaching slag I and leaching liquid I are obtained; an acid solution is added into the leaching slag I according to the liquid-solid mass ratio of the acid solution to the leaching slag I being 10-40:1, then an oxidizing agent is added, agitation leaching is carried out, filtering is carried out after leaching is finished, and leaching slag II and leaching liquid II are obtained; the leaching liquid II is subject to cyclone electrodeposition to obtain cathode copper and an after-electrolysis solution; alkali and a reducing agent are added into the leaching slag II, smelting is carried out under the condition that the temperature ranges from 400 DEG C to 600 DEG C, water leaching is carried out, filtering is carried out, and lead bullion containing precious metal and leaching liquid III are obtained; and the leaching liquid III is purified and is subject to evaporation and concentration to obtain a concentrated alkali solution and sodium stannate crystals. According to the method for recycling the valuable metal in the waste circuit board, the procedure is short, the efficiency is high, the cost is low, cleanness is achieved, and pollution is avoided.

The invention discloses a composite beneficiation inhibitor used for copper-arsenic separating flotation. A hydrophilic oxide film can be formed on the surface of a mineral containing arsenic and copper to selectively separate a mineral which does not contain the arsenic and the copper from the mineral containing the arsenic and the copper. The composite beneficiation inhibitor is composed of, by weight, 75-95 parts of calcium hypochlorite, 8-25 parts of sodium humate and 8-17 parts of sodium hexametaphosphate. The composite beneficiation inhibitor is prepared sequentially through the steps of mixing, grinding and remixing.

The invention belongs to the technical field of waste battery treatment, and particularly discloses a waste lithium ion battery recovery method. A to-be-recovered raw material containing a waste positive electrode active material and an auxiliary agent are roasted at 500-800 DEG C, and then water extraction treatment is performed; and the auxiliary agent is at least one of NaHSO4, KHSO4, CoSO4, NiSO4, MnSO4, NH4HSO4 and (NH4)2SO4. The method overcomes the disadvantages of a traditional recovery method, is simple, practical and economically feasible, realizes comprehensive utilization of wastelithium ion batteries, and is suitable for industrial production.

A metallurgic combination process for extracting vanadium from high-calcium high-iron steel residues relates to a method for extracting vanadium, in particular to a method for extracting vanadium from the waste steel residues with the metallurgic combination process. The steps of the process are as follows that the high-calcium high-iron steel residues are crushed and the reelection pattern is adopted for stripping down light calcium and other nocuous impurities; the refined ore is directly extracted with 95 to 98 percent concentrated sulphurinc acid and then the process of solid-liquid separation is implemented; the extracted liquid is oxidated and the acidity of the liquid is regulated to make the pH value be 1.4 to 2.5; the redox potential is -900mv to -300mv; by adopting the extraction of more than three grades, the extraction phase ratio of O/A is 1/8 to 1/1 and the water phase is unloaded; the load is organically washed and iron is stripped down to effectively realize iron-vanadium separation; the detergent is sulfate; the alkaline solution of 0.25 M to 1.5M is used for the reverse extraction agent for reverse extraction and the phase ratio O/A is 1/1 to 8/1; the process of acidic precipitation of vanadate-leaching Solution is implemented on the reverse extraction solution. The invention has simple process and can effectively extract vanadium from the high-calcium high iron steel residues; in this way, the invention is characterized by low cost, little pollution and high recovery rate.

The invention provides an efficient and clean molybdenum smelting method. The method comprises the steps that lime sulphur-fixed roasting is conducted on molybdenite through a gradient heat preservation method; roasted products are leached with a leaching agent, namely roasted product, and molybdenum-contained leach liquid is obtained; the molybdenum-contained leach liquid is sequentially treated by an acid phosphorus extraction system for extracting molybdenum, and an ammonium hydroxide/ammonium salt system for back-extracting molybdenum, and molybdenum-contained strip liquid and molybdenum raffinate are obtained; impurities in the molybdenum-contained strip liquid are removed through a Mg(OH)2 one-step precipitation method, evaporation and concentration are conducted, and ammonium molybdate products are obtained; and sulfuric acid is added into the molybdenum raffinate for regeneration, calcium sulphate dihydrate products are obtained, and regenerated liquid serves as a leaching agent and is returned back to the leaching process. By the adoption of the method, molybdenum mineral raw materials can be cleaned and treated efficiently, and ammonium molybdate can be prepared, the molybdenum recovery rate reaches 99%, the sulfur fixing rate reaches 98% or over, reagent consumption is low, the production period is short, the process is easy to control, the reaching residue quantity is greatly reduced, zero emission of waste water is achieved, and industrialized application is achieved easily.

The invention discloses a double-pyrazole extracting agent derived from o-phenanthroline with the following structural general formula, and a preparation method and application of the double-pyrazoleextracting agent. In the formula, R is any one selected from n-octyl, n-butyl, isobutyl, ethyl, pyridyl and phenyl. The double-pyrazole extracting agent derived from the o-phenanthroline provided by the invention has a unique rigid structure and an alkyl chain for improving the solubility, and simultaneously only four elements of C, H, O and N are contained, so that the extraction kinetics of a separation extraction system can be greatly increased, the extraction capacity of an organic phase can be increased, secondary pollutants cannot be produced, and thus the environmental protection is facilitated. The extraction agent can be used to separate Ans (actinide elements)/Lns (lanthanide elements), and can not only form a separation extraction system of the Ans/Lns, but also can be used to form a separation reverse extraction system of the Ans/Lns.

Disclosed is a preparation method of silicon separation membrane, having specific selectivity to natural products, which belongs to a membrane preparation technique. The method comprises: dissolving a template agent into an alcohol solution to produce template agent solution, then, adding functional monomers into said produced solution, adding in stabilizer, condensing and refluxing to remove the solvent and produce a silane precursor, dissolving tetraethoxysilane into the alcohol solution, adding in the silane precursor followed by condensing and refluxing to prepare a sol, next, aging at room temperature and dipping treated Al2O3 plate into the sol, finally, sintering in a muffle, eluting the template agent and drying to produce silicon separation membrane. The present invention is characterized in simple preparation, the produced separation membrane realizing selectively separation of a certain substance in molecular scale, water-phase molecule recognition, particularly fit for natural products separation and extensive general uses.

The invention discloses an application of a porous separating membrane in a zinc-bromine flow battery. The porous separating membrane is prepared from more than one or two of polysulfone, polyketone, polyimide, polybenzimidazole, polyvinylidene fluoride, polyvinyl pyridine, polyacrylonitrile, polypropylene, polyethylene, polybutadiene or cellulose acetate; the aperture sizes in the porous separating membrane are 0.05-20nm; and the porosity is 20%-60%. The prepared membrane material can effectively achieve separation of different zinc ions and keep the ion selectivity of the membrane. Furthermore, the membrane material can achieve ion transport without introducing an ion exchange group; and the selection range of the flow battery membrane material is expanded.

The invention discloses an SPEEK (Sulfonated Polyether Ether Ketone) mixed matrix membrane with in-situ doped carbon quantum dots as well as a preparation method and application thereof. The preparation method comprises the following steps: taking polyvinyl alcohol and polyether ether ketone as raw materials and adding the raw materials in concentrated sulfuric acid, and reacting, thus obtaining an SPEEK composite material with the in-situ doped carbon quantum dots; dissolving the SPEEK composite material into deionized water, thus preparing a membrane casting solution; preparing a functionallayer on the surface of a microporous filter membrane through a coating method, and forming the SPEEK mixed matrix membrane of the in-situ doped carbon quantum dots, the mixed matrix membrane is formed by SPEEK and carbon quantum dots, wherein the carbon quantum dots account for 0.1 to 5.0 percent by mass of the SPEEK.. The preparation method provided by the invention is simple and easy, a prepared functional membrane can be applied to CO2/N2 gas separation, and higher CO2 permeability and separation factors are obtained.

Disclosed is a technology for cleanly and efficiently processing lead-bearing waste residues. The lead-bearing waste residues produced by lead smelting and lime are matched according to the mass ratioof 1:0.03-0.07 and are then pressed into blocky lead-bearing residue blocks, and after natural drying, by mass, 7%-15% of coke, 9%-11% of silica and 74%-84% of the lead-bearing residue blocks are matched. Materials are sequentially added into a five-section integrated type smelting furnace, ignition blowing-in is conducted for oxygen-enriched intensified smelting, materials added from a smeltingfurnace feeding section (1) pass through a preheating section (2), a sintering section (3), a half-melting section (4), a smelting section (5) and a layering section (6), and the smelting process of the materials is completed. Through the technology, material preheating, sintering, smelting and clarification laying are integrated, heavy metal, valuable metal, gangue and the like are selectively separated well, dangerous waste is processed cleanly and efficiently, and the technology has the advantages that the process is short, operation is simple and convenient, and investment is small.

The invention provides a nanofiltration membrane for selectively separating trace organic substances and calcium-magnesium ions. The nanofiltration membrane comprises a porous support layer and a filter skin layer, a first solution and a second solution are subjected to interfacial polymerization reaction and heating treatment in sequence to form the filter skin layer, the first solution is a water solution containing polyamine monomers and acid organic matter monomers, and the second solution is formed by dissolving acyl chloride monomers in an organic solvent; in the first solution, the total mass concentration of the polyamine monomers and the acid organic matter monomers is 0.4-1%, and the acid organic matter monomers account for 35-65%; in the second solution, the mass concentration of the acyl chloride monomers is 0.1-0.2%. The invention further provides a preparation method of the nanofiltration membrane for selectively separating the trace organic substances and the calcium-magnesium ions. The nanofiltration membrane has high rejection rate for the trace organic substances but low rejection rate for the calcium-magnesium ions, and chemical stability and health of nanofiltration water are maintained while the trace organic substances are effectively removed.

The invention provides an organic ligand for an MOF (Metal Organic Framework). The organic ligand has a structure as shown in a formula (I), wherein x ranges from 7 to 10, and n ranges from 20 to 30.The invention provides the organic ligand MOF; ligand metal in the organic ligand MOF is iron. The invention also provides the separating membrane containing the organic ligand MOF; the separating membrane comprises a basement membrane and the organic ligand MOF compounded on the surface of the basement membrane. According to the organic ligand and the separating membrane disclosed by the invention, a specific chemical structure of the organic ligand is selected from regulation and control over the aperture size of the MOF; the specific chemical structure is combined with a specific ligand metal and the influence of a growing environment of the MOF and a substrate structure, so that selective separation of ions is researched, and the size of the MOF is accurately regulated and controlled;the selective separation of the ions is realized on the basis of a screening action of aperture, so that the selective adsorption separation in a polyvalent ion solution system is better realized.

The invention discloses a selective contact crystalline silicon heterojunction solar cell and a preparation method thereof. The structure of the solar cell is divided into a plurality of layers from top to bottom: Ag/ITO/MoOx/SiOy/n-c-Si/SiOy/LiFz/Al. During preparation, an ultra-thin SiOy layer (1.0-1.3 nm) grows on the front and rear surfaces of a silicon wafer through the nitric acid oxidationprocess. After that, MoOx, ITO and Ag sequentially grow on the front surface of the silicon wafer, while LiFx and Al sequentially grow on the back surface of the silicon wafer. According to the invention, the selective separation of photogenerated carriers is realized through bending the heterojunction energy band of MoOx/c-Si and LiFz/c-Si respectively based on the high-work function characteristics of MoOx and the low-work function characteristics of LiFz.

The invention discloses a graphene oxide membrane with tent-like nanostructures as well as a preparation method and application thereof. According to the invention, an improved filter assembly methodis established so as to realize reliable preparation of an ultra-thin graphene oxide membrane on a flexible substrate. By intercalating nanoparticles into an ultra-thin structure, construction of tent-like nanostructures in the ultra-thin structure is realized The special tent-like nanostructures are capable of realizing maximum water flux under the premise of retaining retention performance. By adjusting intercalation ratio of the nanoparticles, regulation on sieving channels of the graphene oxide membrane can be realized on the molecular scale; and moreover, selective separation on small molecules of similar sizes is also enabled. The tent-like nanostructures of the graphene oxide membrane in aqueous solutions of different pH values are stable; and moreover, surface roughness, wettability and surface electrical property of the graphene oxide membrane are adjustable. The graphene oxide membrane with the tent-like nanostructures has excellent separation performance, as well as adjustable structures and properties; and thus, the graphene oxide membrane with the tent-like nanostructures has very broad application prospects in the fields of environmental pollution control and membraneseparation technology.

The invention provides a recovery method of a photovoltaic module. The photovoltaic module comprises a metal frame and a junction box, the method comprises the steps that spliting is carried out on the photovoltaic module to obtain the metal frame, the junction box and a to-be-recycled module, the to-be-recycled module is other modules except the metal frame and the junction box in the photovoltaic module; the to-be-recycled assembly is cut by adopting pulse water to obtain a crushing assembly; and sorting is carried out on the crushing assembly, and multiple valuable components are obtained. According to the recovery method, selective separation of the retired photovoltaic module is realized by adopting a pulse water crushing technology, no dust, waste gas or wastewater is generated in the recovery process, no chemical reagent is involved, and therefore the energy consumption is reduced, the recovery efficiency is improved, and secondary production is facilitated.