53results about How to "Easy to realize large-scale industrial application" patented technology

The invention discloses a cage type carbon dioxide adsorption material as well as a preparation method and an application thereof. The preparation method comprises acidation modification of montmorillonite and synthesis of the cage type carbon dioxide adsorption material. In a preparation process of the cage type adsorption material, an impregnation method is adopted, organic matter is directly covered on the inner surface of a mesoporous molecular sieve, the preparation method is simpler in process and low in energy consumption, desorption and regeneration are easy, and energy consumption and cost in an industrial application process can be greatly reduced. Effective loading capacity of organic amine in the composite material is 10-60%, the composite material has good adsorption and desorption capabilities and good stability, as acidified montmorillonite is adopted as a base material, cost is greatly reduced compared with other molecular sieve porous materials, and the requirement of an industrial process, especially removal of carbon dioxide gas in flue gas, to adsorbent material can be met.

The invention provides a method for removing free moisture or emulsified water by a hydrophobic film. In the method, the hydrophobic film is used as a filtering medium; petroleum products with higher content of water pass through the hydrophobic film under operating pressure which is not exceeding aqueous phase penetrating pressure by hydrophobic nature of the film; then moisture content is intercepted by the hydrophobic film, thus obtaining oil products with lower content of moisture. The method of the invention can be applicable to removal of moisture for many oil products avoiding of the effects of moisture content and temperature. The method of the invention is characterized in that removal of moisture content of the oil products can be carried out in real time in the process of oil delivery without adding any reagents, thus greatly reducing energy consumption, featuring in high dehydration rate and great operational flexibility; the whole manufacturing process is easy and large scale industrialized application of the method can be easily realized.

The invention discloses a method of recycling zinc, manganese, lead and silver from zinc electrowinning anode mud. The method comprises the following steps of: after carrying out wet ball grinding on the zinc electrowinning anode mud, filtering, wherein filtrate is taken as a raw material for a zinc smelting system; mixing filter residues and acidic solution, adding a reducing agent to carry out reduction reaction, leaching manganese, filtering to obtain leaching liquid and leaching slag, purifying the leaching liquid, and preparing manganese dioxide through an electrolysis method; and recycling lead and silver with the leaching slag as high-lead slag and a raw material of a lead smelting system. The method, provided by the invention, has the characteristics of less investment, simple process, low cost, easiness in operation and the like; the whole process is a green metallurgical process flow, and is environmental-friendly, the comprehensive recovery and utilization efficiency of resources can be effectively improved, the battery-level manganese dioxide obtained by electrolysis is taken as a new energy material so as to be beneficial for environmental protection and high value-added utilization of resources. The method is easy to realize large-scale industrial application.

The invention provides a device and method for generating barometric pressure uniform discharge. The device for generating barometric pressure uniform discharge comprises a discharge mechanism, an air supply mechanism and a high-voltage power source, the discharge mechanism comprises a hollow needle electrode, a plate electrode and a glass tube, the hollow needle electrode is connected with the air supply mechanism through the glass tube, the hollow needle electrode is electrically connected with the high-voltage power source, and the plate electrode is connected with a ground wire. By means of the device for generating barometric pressure uniform discharge, barometric pressure uniform discharge can be generated in the air environment, therefore, low-temperature plasma generated by the barometric pressure uniform discharge does not depend on a vacuum device, production cost is reduced, and large-scale industrial application is achieved easily; moreover, nitrogen and / or inert gas enters the discharge space along the hollow needle electrode, gas consumption is low, and barometric pressure uniform discharge generated by the device is more economical compared with generating barometric pressure uniform discharge generated by a spray gun. The device for generating barometric pressure uniform discharge is simple in structure, convenient to operate, low in cost, suitable for batch production, and beneficial to popularization and application.

The invention relates to a method for preparing chitin and chitosan by coupling shrimp and crab shells through a hydrothermal / two-step enzymic method. The method comprises the following steps: removing impurities from shrimp and crab shells, and crushing the shrimp and crab shells; adding organic acid for decalcification treatment, placing filter residues into a hydrothermal reactor, and feeding a reaction medium for hydrothermal reaction; then rapidly relieving the pressure in the reactor, collecting a hydro-thermal treatment product, carrying out solid-liquid separation, and adding protease into a solid material to carry out enzymolysis deproteinization treatment; separating the deproteinized product to obtain solid residues, drying the solid residues to obtain chitin, and adding chitin deacetylase into the chitin for enzyme treatment to prepare chitosan; and finally, treating the organic acid decalcification solution and the protein enzymatic hydrolysate to obtain organic calcium and protein peptide. According to the method, the decalcified shrimp and crab shells are modified through a hydrothermal method, the compact structure of the shrimp and crab shells is broken, the accessibility of subsequent protease and deacetylase is promoted, the enzymolysis efficiency is improved, poly-generation of organic acid calcium, protein peptide, chitin and chitosan is achieved, the production process is rapid, stable and free of pollution, and large-scale industrial application is easy to achieve.

The invention discloses a modified montmorillonite carbon dioxide adsorption material and a preparation method thereof. According to the preparation method, a inorganic intercalation agent is used for intercalation so as to insert an inorganic substance into montmorillonite crystal layers, and increase the specific surface area of montmorillonite. The preparation method comprises following steps: preparation of TiO2 intercalation agent; preparation of SiO2 intercalation agent; preparation of TiO2-SiO2 composite intercalation agent; and preparation of the modified montmorillonite carbon dioxide adsorption material. The preparation method is simple; the specific surface area of the obtained modified montmorillonite carbon dioxide adsorption material ranges from 450 to 500m<2> / g; pore volume ranges from 0.28 to 0.32cm<3> / g; pore diameter ranges from 3 to 5nm; the modified montmorillonite carbon dioxide adsorption material possesses excellent absorption capacity on carbon dioxide; cycling stability is excellent; and compared with other modified molecular sieve porous materials, cost is reduced greatly, the modified montmorillonite carbon dioxide adsorption material is of no toxicity and is harmless, and is capable of satisfying industrial processes, especially carbon dioxide removing on absorption materials.

The invention discloses a preparation method of a super-hydrophobic flame-retardant coating with an excellent performance. The preparation method comprises the following steps: dispersing in a mixed solution of absolute ethyl alcohol and ammonia water, ultrasonically stirring, heating, and adding octadecyl trimethoxysilane into the mixed solution to obtain a solution A; dissolving bisphenol A epoxy resin into absolute ethyl alcohol, and performing ultrasonic stirring to obtain a solution B; uniformly mixing the solution A and the solution B, rapidly adding TEOS, adding a flame retardant intermediate, and continuously stirring to obtain a suspension C; and spraying the suspension C onto a substrate for curing to obtain the super-hydrophobic flame-retardant coating. The flame-retardant super-hydrophobic coating with good mechanical stability and chemical stability is successfully prepared by combining a micro-nano structure with epoxy resin, the coating is low in preparation cost, and the preparation technology is simple and is easily applied to industrial production.

The invention relates to a preparation method and an application of a polymer-metal composite separation membrane. The method comprises the following steps: coating a polyvinylidene fluoride microfiltration membrane with dopamine to endow the membrane with the capacity of adsorbing silver ions; then, immersing the membrane adsorbing the silver ions into a reducing solution containing nickel sulfate, and compounding nickel on a polymer separation membrane through reaction to prepare the polymer-metal composite separation membrane. The obtained polymer-metal composite separation membrane realizes sensitivity of Congo red interception rate to an electric field and also has interception stability, and is suitable for selective separation as interception efficiency increases with the enhancement of the electric field, and the separation characteristic of the membrane can be conveniently controlled by changing intensity of the environmental electric field. The method is simple to operate andlow in cost, facilitates industrial application and has great significance in application to printing and dyeing wastewater.

The invention discloses a P-type silicon back passive film of a crystalline silicon solar cell and a preparation method thereof. The passive film is composed of upper and lower SiOxNy films; the first layer of SiOxNy film is an oxygen-rich SiOxNy film, and the second layer of SiOxNy film is a nitrogen-rich SiOxNy film. The P-type silicon back passive film of the crystalline silicon solar cell overcomes the damage of high-temperature oxidization to minority carrier lifetime of a silicon slice, and also avoids the effect of a positive charge on back surface passivation in an SiNx film, and thus greatly improving open-circuit voltage and conversion efficiency of the cell; and the preparation process is simple, the cost is low, the processing cost of the cell slice is greatly reduced, the production cost of the cell is reduced, and the large-scale industrial application is easily realized.

Provided is a method for preparing an electromagnetic shielding composite material with a ferrum-based amorphism / nanocrystalline strip serving as a patch layer. The method comprises processing steps of (1) plasticating isobutylene-isoprene rubber (IIR) on an open type rubber refining machine for 3-10 minutes, then adding rubber compounding agents (known technology) with fixed types and proportion, mixing for about 15-60 minutes to enable a compound phase to be evenly dispersed in the IIR, mixing plastication rubber with white carbon black with proportion of 4:1-6:1 by mass, and producing an IIR film with thickness of 0.1-1mm; (2) compounding carbon fibers with the IIR film to produce an IIR film / carbon fiber / IIR film interlayer structure, and sulfide forming in a pressure forming machine with sulfide temperature at 165 DEG C, sulfide time for 1-5 hours and sulfide pressure at 1-10 MPa; and (3) selecting ferrum-based amorphism / nanocrystalline alloy strips under unannealed conditions and with different thicknesses to produce the surface conductive type electromagnetic shielding composite. The method has the advantages that (1) by means of recycle of waste strips, the processing problem of the waste strips can be effectively solved so that the method has high economic benefits and environmental benefits; and (2) the preparation process of the method is simple in process, low in equipment requirement, remarkable in effect and favorable for achieving large-scale industrialized application.

The invention relates to a method for preparing humic acid from a tail vegetable treated by wet hydrolysis and application. The method includes the steps that the tail vegetable of a vegetable is crushed and the moisture content of the tail vegetable is adjusted, after a chemical catalyst is added for preimpregnation treatment, the tail vegetable is placed in a wet hydrolysis reactor and filled with saturated water vapor for wet hydrolysis treatment, pressure in the reactor is quickly released, a humic material is collected, an alkaline material is added to extract, mixed liquid of fulvic acidand the humic acid and solid residue rich in humin are obtained, after the solid residue is dried by vacuum, a dried product of the humin is obtained, an acid material is added to the mixed liquid for precipitation, solid precipitation is dried after alkaline washing to prepare the humic acid, and the liquid is dried after treated by resin to produce the fulvic acid. The method is applicable to awide range of raw materials, the product yield is high, the production process is fast, stable and pollution-free, large-scale industrial application is easily realized, and reduction, resource and harmless treatment of a large amount of tail vegetables are promoted.

The invention provides an oriental cherry flower extract and an extraction method and application thereof. The extraction method comprises the following steps: extracting oriental cherry petals by adopting an extracting agent to obtain the oriental cherry flower extract, wherein the extracting agent comprises a composition of C3-C6 small molecular polyhydric alcohols, ethanol and water. The extraction method is simple in process route, large-scale industrial application is easily realized, and the obtained oriental cherry flower extract contains rich high-activity active ingredients, has an excellent hair-blacking effect, can be applied to hair-blacking cosmetics of multiple dosage forms such as aqueous solution and emulsion and is wide in application range. The oriental cherry flower extract is mild and non-irritating, is capable of activating tyrosinase, repairing damaged melanocytes and promoting growth of the melanocytes and generation of melanin, regulation and repair are performed from a melanin formation pathway, the aims of blacking hair and improving gray hair and white hair are achieved, the hair can be effectively blacked after the oriental cherry flower extract is usedfor 15 days, and the oriental cherry flower extract has excellent effects.

The invention relates to a CO2 emission reduction technology and aims at providing a method and a device for thermo chemolysis of CO2 and H2O based on reaction substance circulation. The method comprises the steps of feeding the H2O, I2 and SO2 into a Bunsen reaction device for automatic heat release reaction; communicating CO2 gas to a static bed or a fluid bed reactor for heat release reaction with metal Zn or Ni; circulating the products in each reaction process through each reaction device, wherein the final products are H2, CO and O2. The device provided by the invention has a lower maximum heat resource temperature (less than 900 DEG C); heat resources, such as solar energy, nuclear energy and other types can be used; negative influence caused by incomplete reaction of Zn and CO2 is reduced to a certain extent; the device is appropriate in reaction temperature and easy to realize industrial application in scale.

The invention relates to a CO2 emission reduction technology and aims at providing a method and device for preparing CO and H2 by thermochemical cycle decomposition of CO2 and H2O. According to the method, H2O, I2 and SO2 are fed into a Bunsen reaction device to perform a spontaneous exothermic reaction; CO2 gas is introduced to a fixed bed or a fluidized bed reactor and performs an exothermic reaction with metal Zn or Ni; and products in various reaction process are recycled by various reaction devices and final products are H2, CO and O2. The highest heat source temperature of the device is lower (less than 900DEG C) and other various forms of heat sources such as solar energy and nuclear energy can be used; the negative influence caused by incomplete reaction of Zn and CO2 is reduced to a certain degree; and the reaction temperature is proper and the scale industrial application is easily realized.

The invention discloses a comprehensive recovery method for flotation of silver concentrate from zinc hydrometallurgy acid leaching residues. The method comprises the following steps that A, activation reduction dezincification is conducted, specifically, silver concentrate pulp and zinc electrolysis waste liquid are mixed in a leaching tank, and flue gas obtained after roasting of a zinc concentrate fluidized bed furnace and dust collection treatment is introduced into the bottom of the leaching tank; B, iron precipitation is conducted through a goethite method, specifically, iron precipitation is conducted on the leachate obtained in the step A through the goethite method; C, reduction leaching and purification are conducted, specifically, reduction leaching is conducted on the goethiteslag obtained in the step B, a purifying agent is added at the leaching end point, pH is adjusted, and purified liquid is obtained; and D, purified liquid synthesis is conducted, specifically, phosphate and an oxidizing agent are slowly added into the purified liquid obtained in the step C to obtain iron phosphate. The method has the advantages of reasonable process, low separation cost, no pollution, no toxicity and the like, the obtained liquid after iron precipitation can be used as a raw material for zinc hydrometallurgy, and iron phosphate can be used as a raw material of a lithium ion battery cathode material lithium iron phosphate.

The invention relates to a conductive composite separation membrane and a preparation method thereof. The preparation method comprises the following steps: providing a polymer membrane coated with silver nanoparticles, and immersing the polymer membrane coated with the silver nanoparticles in a cobalt-nickel reducing solution for chemical deposition to prepare the composite separation membrane, wherein the cobalt-nickel reducing solution comprises cobalt salt, nickel salt and a reducing agent. According to the invention, the polymer separation membrane is modified, so that when the modified membrane filters Congo red, methylene blue and rhodamine, the modified membrane can be combined with an external electric field to prevent dye molecules from adhering to or penetrating through the separation membrane, the dye rejection and pollution resistance of the separation membrane are remarkably improved, and the separation membrane has extremely high water flux.

The invention relates to the field of thermo-chemical cycle systems, and aims to provide a method and a device for simplifying thermo-chemical ZnSI cyclic decomposition of carbon dioxide and water. The method mainly comprises the following steps: performing isothermal reaction on ZnI2 and CO2 to obtain Zn, ZnO, ZnI2, I2 and CO, then performing gas-solid separation, separating CO out from the gas product, reacting the solid product, water and HI to generate ZnI2 and H2O, and preparing ZnI2 solid. The device comprises a distillation tower, a solid feeding device, a ZnI2 / CO2 decomposition reaction generator, a gas-solid separation device, an iodine separation and recovery device, a ZnI2 generator, an HI phase concentrate decomposition system and a Bunsen reaction system. By adopting the method and the device, a thermo-chemical ZnSI cycle system is simplified from a six-step mode to a five-step mode, so that the reaction steps are reduced, the reaction device is simplified, the operation is convenient, no additional matters are introduced and the initial input cost is reduced.

The invention discloses a method for preparing iron ore concentrate and aluminum ore concentrate by suspension co-roasting of red mud and coal gangue. The method comprises the following steps of: (1)crushing and grinding coal gangue; (2) mixing a red mud raw material with the coal gangue powder; (3) conveying the mixed powder to a suspension high-temperature furnace, enabling the mixed powder tobe in a suspension state under the action of negative pressure and airflow, heating the mixed powder to 650-1000 DEG C, and dehydrating the mixed powder to form high-temperature powder; (4) enabling the high-temperature powder to enter a cyclone separator, cooling to 600-950 DEG C to form a dehydrated material, and enabling the dehydrated material to enter a suspension roasting reducer; (5) introducing air and nitrogen into the suspension roasting reducer to enable the dehydrated material to be in a suspension state, cooling to 500-800 DEG C, reacting, and discharging the residual solid material as a reduction material; and (6) cooling the reduction material, grinding, and carrying out low-intensity magnetic separation to obtain magnetic iron ore concentrate and non-magnetic aluminum ore concentrate. The method disclosed by the invention is short and efficient in process, low in energy consumption, low in treatment cost, good in economy, environment-friendly and easy to realize large-scale industrial application.

The invention belongs to the field of organic synthesizing, and relates to a method for synthesizing azacycloheptane. The comprises the following steps: caprolactam under the shielding of inert gas in an organic solvent is reduced into azacycloheptane through a metal reducer; the azacycloheptane is extracted, cleaned, dried, concentrated and distilled into a pure azacycloheptane product of which the mass fraction is equal to or larger than 98 percent. The method has the advantages that the raw material is cheap and easy to obtain; the synthesizing steps are easy; the reaction condition is mild; the product yield and the purity are high; the industrialized application prospect is favorable.

The invention relates to a method for rapid reduction and resource utilization of fruit processing solid waste. The method for rapid reduction and resource utilization of the fruit processing solid waste comprises the steps that the fruit processing solid waste is smashed, water or a chemical catalyst is added for pre-dip treatment, then the mixture is placed in a hydrothermal degradation reactor,saturated steam is introduced in the mixture for hydrothermal degradation treatment, after the reaction is finished, the pressure in the reactor is quickly removed, and a material subjected to hydrothermal degradation is collected; and after the material subjected to the hydrothermal degradation is mixed with an auxiliary material, an organic fertilizer is produced by aerobic solid-state fermentation, or biological feed is produced by anaerobic solid-state fermentation. A wide application range of raw materials, no special dry processing, high product yield, fast and stable production processand no pollution are achieved, large-scale industrial application is easily realized, and the purpose of rapid reduction and resource utilization of fruit processing solid waste can be realized.

The invention discloses a method of recycling zinc, manganese, lead and silver from zinc electrowinning anode mud. The method comprises the following steps of: after carrying out wet ball grinding on the zinc electrowinning anode mud, filtering, wherein filtrate is taken as a raw material for a zinc smelting system; mixing filter residues and acidic solution, adding a reducing agent to carry out reduction reaction, leaching manganese, filtering to obtain leaching liquid and leaching slag, purifying the leaching liquid, and preparing manganese dioxide through an electrolysis method; and recycling lead and silver with the leaching slag as high-lead slag and a raw material of a lead smelting system. The method, provided by the invention, has the characteristics of less investment, simple process, low cost, easiness in operation and the like; the whole process is a green metallurgical process flow, and is environmental-friendly, the comprehensive recovery and utilization efficiency of resources can be effectively improved, the battery-level manganese dioxide obtained by electrolysis is taken as a new energy material so as to be beneficial for environmental protection and high value-added utilization of resources. The method is easy to realize large-scale industrial application.

The invention relates to a three-dimensional electrode reactor with coupling of Fe<2+> cathode reduction and anodization, in particular to a two-chamber electrochemical reactor with a three-dimensional moving bed electrode, with a hydrogen evolution overpotential metal particle as an electrocatalytic material and a surface renewable, as a cathode, a conductive carbon material as an anode and a perfluoro cation membrane as a separator. While Fe<2+> is removed by electrodeposition in a cathode chamber, Fe<2+> is electrochemically oxidized into Fe<3+> in an anode chamber, thereby achieving coupling between the removal of Fe<2+> and the formation of Fe<3+>. The electrochemical reactor disclosed by the invention has the remarkable characteristics of reasonable structure, renewable electrode surface, recycling of the electrode, simple preparation of the reactor, low production cost, convenience for realization of large-scale industrial application, and the like, and is an electrochemical reactor with coupling of Fe<2+> cathode reduction and anodization for Fe<3+> preparation, which meets the requirements of green chemical development.

The invention relates to the field of CO2 emission reduction and thermochemical hydrogen production and aims to provide a method and a device for preparing H2 and coproducing H2SO4 through thermochemical cycle mineralization of CO2 during decomposition of H2O. A Bunsen reaction device is connected with a liquid phase separation device which is connected with a HIx concentration device and a H2SO4concentration device, the HIx concentration device is connected with the Bunsen reaction device and a Mg12 generation reactor which is connected with a Mg12 distillation device, the Mg12 distillationdevice is connected with the Bunsen reaction device and a Mg12 hydrolysis carbonation reactor which is connected with a HI catalytic decomposition reactor, and the HI catalytic decomposition reactor is connected with the Bunsen reaction device. CO2 mineralization technology and hydrogen production through thermochemical sulfur-iodine open cycle decomposition of water are organically combined creatively, and CO2 is mineralized and fixed in mild reaction conditions while H2 and H2SO4 with high added value are coproduced; hydrogen production cycle and mineralization technology are organically combined, so that higher theoretical heat efficiency is realized; the method is proper in reaction temperature and easy for large-scale industrial application.

The invention provides a system for producing high-whiteness calcined kaolin by multistage suspension calcination of coal series kaolin. A crusher, a mill, a feed bin and a spiral feeder are sequentially matched, and the spiral feeder is matched with a feed port of a suspension dehydration calcinator; the suspension dehydration calcinator, the first cyclone separator, the suspension dehydroxylation calcinator, the second cyclone separator, the suspension decarburization calcinator and the third cyclone separator are sequentially communicated in series, and a discharge port of the third cycloneseparator is communicated with a feed port of the first-stage cooler; and the first-stage cooler and the second-stage cooler are communicated in series. The system and the method can realize accurateregulation and control of coal series kaolinite in calcination, obtain products with uniform properties at each stage, and have the advantages of environmental friendliness, low energy consumption, high heat and mass transfer efficiency, low treatment cost, good economy, easiness in realization of large-scale industrial application and the like.

The invention relates to a preparation method of a composite separation membrane, which is characterized in that a metal salt solution, a polyphenol solution and an oxidant solution are matched for use, and are subjected to complex reaction and oxidative polymerization reaction on a polymer substrate, so that a modified layer with relatively strong hydrophilicity is formed, and the flux, the rejection rate and the anti-pollution performance of the separation membrane are improved. The preparation method is short in time consumption, simple to operate, mild in reaction condition and easy to realize large-scale industrial application, and has obvious popularization advantages. The preparation method disclosed by the invention can be carried out through ink-jet printing, and is high in raw material utilization rate, free of resource waste and environment-friendly. The invention also relates to the composite separation membrane obtained by the preparation method, and the composite separation membrane has the advantages of strong hydrophilicity, high flux, high rejection rate, high pollution resistance and good separation effect, and has important significance in the separation of oil-water emulsions.

The invention relates to the field of CO2 discharging reduction and thermochemical hydrogen production, and aims to provide a method and device for preparing H2 by simultaneous thermochemical cycle mineralization of CO2 and decomposition of H2O. A Bunsen reaction device is connected with a liquid phase separation device; the liquid phase separation device is connected with a HIx concentration device and a H2SO4 concentration device respectively; the H2SO4 concentration device, a concentrated H2SO4 catalytic decomposition device and the Bunsen reaction device are connected in sequence; the HIxconcentration device is connected with the Bunsen reaction device and a MgI2 generation reactor; the MgI2 generation reactor is connected with a MgI2 distillation device; the MgI2 distillation deviceis connected with the Bunsen reaction device and a MgI2 hydrolytic carbonation reactor; the MgI2 hydrolysis carbonation reactor is connected with an HI catalytic decomposition reactor; and the HI catalytic decomposition reactor is then connected with the Bunsen reaction device. According to the device, a CO2 mineralization technology and thermochemical sulfur-iodine open-cycle water decompositionfor hydrogen production are organically combined creatively; CO2 is mineralized and fixed under a relatively mild reaction condition, and H2 with a high additional value is co-produced; and an HI-I2 rectification process in a traditional hydrogen production cycle is avoided, and higher heat efficiency is achieved.

The invention discloses a preparation method of an amorphous surface modified layered double hydroxide hierarchical heterostructure electrocatalyst in the technical field of material preparation, which comprises the following steps: (1) dissolving CoCl2.6H2O, AlCl3.6H2O, ammonium fluoride and urea in deionized water to obtain a mixed solution; (2) transferring the mixed solution into a high-pressure hydrothermal reaction kettle, and then adding foamed nickel into the kettle; and (3) stirring FeCl3.6H2O and absolute ethyl alcohol for 10 minutes to form a solution, putting the foamed nickel obtained in the step (2) into the solution, magnetically stirring for 12 hours, then taking out, cleaning with absolute ethyl alcohol for three times, putting into a vacuum drying oven, and preserving heat at 60 DEG C for one night to obtain a target product. Compared with a traditional noble metal oxide, the product has the advantages that the catalytic performance is guaranteed, and meanwhile, the product is wide in raw material source, low in price and easy to popularize; the preparation technology is simple, the technical requirement is not high, and industrial large-scale application is easy to achieve.

The invention belongs to the technical field of hydrometallurgy and relates to a method for separating chromium and iron and aluminum in a sulfuric acid system solution containing chromium, iron and aluminum. The method comprises the following steps: 1) adding an oxidizing agent for pretreatment; 2) adjusting the solution to a specific pH value, adding phosphate and reacting at a specific temperature to obtain iron-aluminum phosphate composite precipitation and filtrate mainly composed of iron phosphate; 3) Adjust the filtrate to a specific pH value, add phosphate again and react at a specific temperature to obtain iron-aluminum phosphate composite precipitation mainly composed of aluminum phosphate and chromium sulfate solution to complete the separation of chromium and iron-aluminum. The method has short flow, simple operation, and is easy to be applied on a large scale; adopting the step-by-step precipitation method of phosphate has strong selectivity and ideal separation effect; the recovery rate of metal chromium is greater than 98%, and the economic benefit is remarkable; the whole separation process No chemical substances that may cause harm to the environment are used, which meets the requirements of green environmental protection.

The invention relates to the technical field of polymer separating membrane surface modification, in particular to a method for polymer separating membrane surface modification. The invention provides a preparation method for a separating membrane with pH-dependent flux under an acidic condition; according to the method, hydroxyethyl acrylate is grafted on the surface and / or the membrane pore surface of a PVDF (polyvinylidene fluoride) membrane in a radiation field of Co60. According to the preparation method, the hydroxyethyl acrylate is grafted on the PVDF membrane through Co60 high-energy radiation; the sensitivity of the membrane to the solutions with different pH values is changed. The grafted membrane has pH dependence, so that the membrane flux is reduced along with the increment of the pH; moreover, the membrane flux is remarkably reduced when the pH is between 4 and 5, so that the membrane is very suitable for selective separation; by changing the pH value of the environment, a pollution behavior in a membrane control process and separating characteristics of the membrane are controlled.