69results about How to "Long-term cycle use" patented technology

The invention relates to a device for physically treating industrial circulating water. In the device, a water pipeline is sequentially provided with a water-supplementing electromagnetic valve, a media filter, an electronic descaling instrument, a conductivity real-time analyzer, a front pollution-discharging electromagnetic valve, a copper / silver ion generator and a back pollution-discharging electromagnetic valve, wherein a solenoid coil of the electronic descaling instrument is wound around the pipeline, a conductivity sensor is arranged in the pipeline, the media filter is in series connected to the pipeline, the copper / silver ion generator is in parallel connected to the pipeline, and the conductivity real-time analyzer is provided with output ends which are respectively connected with the water-supplementing electromagnetic valve, the front pollution-discharging electromagnetic valve, the back pollution-discharging electromagnetic valve, the copper / silver ion generator and the electronic descaling instrument. The device physically removes suspended solid impurities in the circulating cooling water, kills alga, bacteria and viruses in the water, prevents water from scaling on the device, eliminates the scale layer arranged on the device, detects the conductivity of water on line, discharges cooling water with higher cycles of concentration, supplements new cooling water, enables the cooling water to be under duty-cycle operation for a long time, has the advantages of simple operation and lower cost, and does not generate environmental pollution.

A gold extraction process method for refractory gold ore uses continuous operations of sulfation roasting, cinder secondary low-temperature acidic roasting, middle-temperature sulfation decomposition and cyaniding gold extraction. Sulfuric acid produced in a general sulfation roasting process is utilized, cinder is secondarily roasted and oxidized in low temperature and acidic mode, then middle temperature roasting is performed to resolve sulfate, the cinder is finely ground to be cyanided and leached, and refractory gold wrapped in carbon, arsenic and sulphur can be efficiently recycled. The method combines advantages of a roasting oxidation method and an acid hot press oxidation method and enables the advantages to be achieved in normal pressure, thereby being moderate in operation conditions, quick in response speed, low in process investment cost, appropriate in production cost, environmentally-friendly and capable of achieving industrial production easily. The method is also suitable for other roasting-leaching hydrometallurgy systems.

The invention relates to a carburizing and quenching process, which belongs to the technical field of heat treatment of metal. The carburizing and quenching process comprises the steps of carburizing for the first time, carburizing for the second time, quenching for the first time, quenching for the second time, tempering at high temperature and tempering at low temperature. According to the carburizing and quenching process designed by the invention, two-time carburization is adopted during carburization, and the carburizing time of each time is shortened, so that the defects that metal hardness is low due to long-time heating and the anti-fatigue performance and the wear resistant performance are reduced can be effectively prevented, and the service life of a workpiece is greatly prolonged; in addition, two-time quenching is adopted, so that residual stress of the workpiece can be preferably released, and the service life is prolonged.

The present invention relates to a method for deamination and denitrification of residential quarter sewage, belonging to the field of sewage treatment technology. It is characterized by that after the sewage is passed through anaerobic filter tank, contact oxidation tank and precipitation tank to obtain treatment, then sewage can upwards flow and be fed into two parallel modified zeolite adsorption regeneration columns to implement ammonia and nitrogen adsorption at twice successively, so that said invention can obtain high ammonia and nitrogen treatment efficiency. Said invention also provides the regeneration method of the above-mentioned zeolite adsorption regeneration column by using backflush process.

The invention discloses a laser desorption ionization mass spectrometry detection method. The method includes the following steps: (1) preparing an efficient light absorbing material as a sample substrate; (2) dropping a to-be-detected sample into the sample substrate, and drying the to-be-detected sample; and (3) performing laser desorption ionization mass spectrometry analysis. The desorption ionization of organic and biomolecules can be effectively realized by using the efficient light absorbing material as the sample substrate of laser desorption ionization, and fragment ions are hardly generated; mass spectrometry detection and analysis on various samples such as carbohydrate, amino acid, metabolite and drug molecules can be realized; and good signal to noise ratio, repeatability, high sensitivity and high salt tolerance can be realized; through the method, complex sample preparing processes are not needed, the addition of organic matrixes are not needed, and there is no background peak interference at low quality end; and a general, simple, efficient, fast and sensitive soft ionization detection method can be provided for various biomolecules.

The invention relates to a method and device for removing high concentration hydrogen sulfide gas, and provides a method for removing high concentration hydrogen sulfide gas. The method comprises the following steps: simultaneously introducing high concentration hydrogen sulfide gas and a strong alkaline adsorption solution into a one-stage or multi-stage swirl injection adsorber; then delivering the adsorption solution that absorbs hydrogen sulfide in the one-stage or multi-stage swirl injection adsorber to a circulation liquid groove, heating the adsorption solution by a coil pipe of the circulation liquid groove, then pumping the adsorption solution into a desorption reactor by a solution circulation pump; in the desorption reactor, oxidizing the adsorption solution in the presence of a metal ion catalyst to carry out desorption so as to separate simple substance sulfur, recovering the separated sulfur; and delivering the effluent generated in desorption reactions into an adsorption solution regenerator, wherein in the regenerator, polyphenol carries out reactions with oxygen in the air to generate quinone, quinone oxidizes reduced metal ion catalysts in the regenerator to recover the catalysts, the oxidation and desulfurization performance of catalysts is recovered, and the adsorption-desulfurization-regeneration circulation is accomplished. The invention also provided a device for removing high concentration hydrogen sulfide gas.

The invention relates to the field of environmental protection, and discloses a low-energy chemical field-driven organic pollutant degradation catalyst and an application thereof. The catalyst can efficiently degrade azo dyes, nitro compounds and various other organic pollutants without providing additional energy. The catalysis system uses formate as an assistant, metallic palladium, silver, gold, platinum and iridium are used as catalytic active main bodies and are supported on the surface of a carrier oxide, C-H bonds in formate radicals are broken when the formate ions in a mixed solutionof the formate and organic pollutants are in contact with a transitional noble metal interface in order to form reactive oxygen species, the reactive oxygen species include hydroxyl radicals, hydrogenperoxide radicals, carbonate radicals and the like, and the generated free radicals rapidly oxidize adsorbed organic matters into small-molecular substances which can be naturally degraded, or even nontoxic water, CO2 or carbonates. The catalyst has the advantages of extremely high efficiency in organic pollutant degradation treatment, low cost, stable catalysis system and high recycling rate.

The invention discloses a method for recycling drawing oil. The method comprises the following steps: arranging a circular processing device at a naked copper flat wire of a drawing machine; blending drawing oil in an oil storing pool with water, wherein the ration in part by weight of the drawing oil to the water is 1:(1-2); opening an oil pump, spraying the drawing oil blended with the water on the naked copper flat wire through a spraying head; returning a dropping solution in a collecting tank; and returning in the oil storing pool through a pipeline. According to the method, the naked copper flat wire is favorably and rapidly cooled, a full lubricating effect is ensured, the quality of the naked copper flat wire is improved, the drawing oil can be recycled for a long time, and the production cost is low.

The invention discloses a method for removing high-concentration thallium-containing industrial wastewater by manganese ferrite. The method comprises the steps as follows: 1, adding an oxidizing agentto high-concentration thallium-containing wastewater, performing stirring and oxidizing part of univalent thallium in water into trivalent thallium; 2, adding nanoscale manganese ferrite or a nanoscale manganese ferrite adsorbent coated with humic acid to the wastewater obtained in the step 1 to adsorb trivalent thallium and univalent thallium in water; 3, applying a magnetic field around the wastewater obtained in the step 2, taking a supernatant as obtained treated water, and performing solid-liquid separation on the wastewater; 4, removing the magnetic field after solid-liquid separation in the step 3, taking out a nanoscale manganese ferrite adsorbent solid, and performing desorption to obtain an enriched recovered thallium solution and a regenerated nanoscale manganese ferrite adsorbent. The method has the advantages as follows: nanoscale manganese ferrite is convenient to produce and low in preparation cost and can be repeatedly recycled after being prepared once, and heavy metal thallium can be recovered efficiently.

The invention provides a wire metal direct melting 3D printing forming process and device. According to the specific implementation method, one pole of a DC power supply is connected with a metal wire, and the other pole of the DC power supply is connected with a graphite platform. A wire feed pipe and a gas guide pipe are connected with an inner layer and an outer layer of a coaxial spray head correspondingly. When the metal wire in the inner-layer pipe keeps close to the graphite platform, an electric arc for melting metal is formed between the metal wire and the graphite platform. As graphite and liquid metal low-carbon iron have good mutual infiltration effect, the graphite platform is located in a short-circuit current loop, under the function of current, electrified metal liquid drops and a magnetic bottom plate below the graphite platform have the attraction effect on metal, and under the combined action of the three parts, the metal makes good contact with the platform. Siliconcarbide powder can be mixed into gas through protective gas, adheres to the surface of a metal pool and is instantly subjected to sintering to form a silicon carbide ceramic wear-resistant layer. A lead screw drives the coaxial spray head and the graphite platform to move as required. The metal liquid drops continuously drip and are accumulated layer by layer to form a high-performance metal 3D printed product.

The present invention relates to a method for deamination and denitrification of residential quarter sewage, belonging to the field of sewage treatment technology. It is characterized by that after the sewage is passed through anaerobic filter tank, contact oxidation tank and precipitation tank to obtain treatment, then sewage can upwards flow and be fed into two parallel modified zeolite adsorption regeneration columns to implement ammonia and nitrogen adsorption at twice successively, so that said invention can obtain high ammonia and nitrogen treatment efficiency. Said invention also provides the regeneration method of the above-mentioned zeolite adsorption regeneration column by using backflush process.

The invention discloses a sponge city road drainage system. The system comprises a drainage channel dug in a roadbed, an annular groove is dug in the roadbed, the annular groove is communicated with the drainage channel through a flow guide groove, a first baffle is slidably connected in the annular groove, and a second baffle is fixedly connected in the annular groove. The first baffle and the second baffle are elastically connected through a first spring, a filter screen is embedded in the flow guide groove, an arc-shaped groove is formed in the inner wall of the annular groove, and a watersupply pipe communicating with the annular groove is embedded in the roadbed. Rainwater containing a large amount of pollutants in the initial stage is guided into a sewage treatment system through ablow-off pipe, the road is gradually flushed cleanly by the rainwater as time goes by, and cleaner rainwater in the later stage can be directly guided into a designated place through the water supplypipe to be collected, so that the rainwater on the road surface is treated by stages, the rainwater absorption efficiency of a sponge city is guaranteed, and meanwhile, a polluted water source can betreated.

The invention provides a preparation method of dimethyl disulfide, which comprises the following steps: adding powder sulfur into a reactor under pressurized reaction conditions, and reacting the sulfur with a liquid catalyst sodium sulfide in the reactor to generate a sodium persulfide solution; introducing impure methyl mercaptan gas to react with sodium persulfate, wherein the reaction solution is divided into an organic layer dimethyl disulfide and byproducts (dimethyl trisulfide and dimethyl polysulfide); and rectifying the dimethyl disulfide and byproducts (dimethyl trisulfide and dimethyl polysulfide) to obtain dimethyl disulfide, wherein the mixed solution of the byproducts (dimethyl trisulfide and dimethyl polysulfide) returns to the reactor to complete the circular reaction. The reaction conditions are mild, the product is insoluble in the liquid catalyst and can be easily separated, and the catalyst can be circularly used for a long time.

The invention discloses a method for preparing lactulose by directionally assisting lactose isomerization by using a phenylboronic acid-based polymer carrier and separating and purifying the product lactulose at the same time. The preparation method comprises the following steps: firstly, realizing directional selective adsorption of lactulose in a lactose isomerization system by utilizing a specific affinity adsorption effect between a phenylboronic acid functional group loaded by a phenylboronic acid-based polymer carrier and lactulose containing an ortho-position cis-hydroxyl structure, andpromoting an isomerization reaction to be carried out in the direction of generating lactulose; the conversion rate of the target product can be greatly improved, and the final lactulose yield can reach 65% or above. Meanwhile, the phenylboronic acid-based polymer carrier for directionally and selectively adsorbing lactulose can obtain a high-purity lactulose desorption solution through desorption operation, and the purity of the desorption solution can reach 95% or above.

The invention discloses an evaporation fan for a passenger car and a passenger car air conditioning system. The evaporation fan for the passenger car solves the problem of high air outlet noise of theevaporation fan and reduces the noise reduction cost. The passenger car air-conditioning system applying the fan reduces the noise inside the passenger car and improves the comfort level. The evaporation fan comprises a fan body and flow guide plates, wherein the flow guide plates are arranged at an air outlet of the fan body, the number of the air guide plates is multiple, and the multiple air guide plates are evenly arranged at intervals. When the air guide plates are designed to be arc-shaped, air supply to the inner side of the vehicle is facilitated, and the air outlet flow resistance isreduced. Meanwhile, air flows in an arc-shaped channel in a streamline mode, the turbulence degree of an air outlet flow field is reduced, air outlet noise is further lowered, air noise caused by blowing away of the air flow is lowered, the noise is reduced, the utilization rate of the air flow is increased, and the cooling efficiency is improved; and the air guide plates can be recycled for a long time and is convenient to clean, so that the use cost is greatly reduced.

The combined high-effective wet desulfurizing dust-removing equipment includes lower dry type cyclone dust collector, its bottom portion is equipped with ash exhauster, ash discharging device and outward ash-exhausting cylinder, a lower external cyclone body is set on the outward ash-exhausting cylinder. It is characterized by that in the interior of outward ash-exhausting cylinder an internal ash-exhausting cylinder is set, on the internal ash-exhausting cylinder and in lower external cyclone body interior oa lower internal cyclone body is set, one side of lower internal cyclone body is equipped with guide vane, on the top plate or the lower internal cyclone body a tornadotron is set, and on the lower dry-type cyclone dust collector an upper wet desulfurizing dust-removing device is set,and said tornadotron is connected with upper wet desulfurizing dust-removing device.

The invention discloses a high efficiency and continuous oil-water separation device, and belongs to the technical field of functional material application. The device comprises an oil collecting tank, a mechanical pump and an oil collecting device. The collecting tank is of a cube frame structure, metal substrate loaded with hydrophobic film is fixed on five surfaces of the cube frame, the five surfaces of the cube frame are in full contact with the oil and water mixture, and the sixth surface is an opening. The oil inlet of the mechanical pump is connected with the oil collecting tank through a pipeline, the oil outlet of the mechanical pump is connected with the oil collecting device through a pipeline. The high efficiency and continuous oil-water separation device overcomes such defects of polymer membrane that the processing amount is small, the separation speed is slow, and the wastewater can only be processed in batches. The continuous separation of oily wastewater can be conducted, and the high efficiency and continuous oil-water separation device provides a possibility of the application of membrane separation technology in oily wastewater treatment in actual life.

The invention discloses multifunctional hydrogel for immobilizing SRB through a microbiological method and a preparation method of the multifunctional hydrogel. The multifunctional hydrogel for immobilizing SRB through the microbiological method can remove SO4 < 2-> and heavy metal ions in wastewater, and a practical and effective new method is provided for improving the pH of acid mine wastewater and efficiently removing heavy metal. The hydrogel adsorbing the heavy metal can realize desorption of heavy metal ions after acid pickling, so that reasonable reutilization of resources is realized, and economic circulation and sustainability are realized. In addition, the hydrogel has stable physical and chemical properties and can be recycled for multiple times, so that the wastewater treatment cost is reduced.

The present invention discloses metal sheet welding process for producing great diameter metal bellows for large mechanically driving turning gear. The welding process includes the following steps: cutting metal sheet into blank of certain length determined by the welded metal bellows, washing and stoving, dye checking, shaping, dye checking for the second time, washing and stoving, welding the inner cylinder and the outer cylinder, vacuum heat treatment, welding the front seat and the back seat, and final vacuum heat treatment to form the metal bellows.

The combined high-effective wet desulfurizing dust-removing equipment includes lower dry type cyclone dust collector, its bottom portion is equipped with ash exhauster, ash discharging device and outward ash-exhausting cylinder, a lower external cyclone body is set on the outward ash-exhausting cylinder. It is characterized by that in the interior of outward ash-exhausting cylinder an internal ash-exhausting cylinder is set, on the internal ash-exhausting cylinder and in lower external cyclone body interior oa lower internal cyclone body is set, one side of lower internal cyclone body is equipped with guide vane, on the top plate or the lower internal cyclone body a tornadotron is set, and on the lower dry-type cyclone dust collector an upper wet desulfurizing dust-removing device is set, and said tornadotron is connected with upper wet desulfurizing dust-removing device.

The invention relates to an exhaust gas automatic processing equipment suitable for spray booths. According to the exhaust gas automatic processing equipment suitable for spray booths, a gas inlet end of the exhaust gas automatic processing equipment is loaded and communicated with a gas outlet end of a spray booth; an exhaust fan arranged on the gas outlet end of the spray booth is used for blowing exhaust gas into the exhaust gas automatic processing equipment; the exhaust gas automatic processing equipment comprises a gas inlet end and a detachable shielding tank body; a washing tower, a dynamic shielding device, a dedusting filter, and an active carbon adsorption chamber are arranged in the detachable shielding tank body, and are connected end to end successively; the gas outlet end of the spray booth is communicated with a gas inlet pipe of the washing tower through a gas inlet port on one side of the detachable shielding tank body; a gas outlet end of the active carbon adsorption chamber is communicated with a gas inlet end of a discharge device through a gas outlet port on the other side of the detachable shielding tank body. According to the exhaust gas automatic processing equipment, multi-stage processing equipment in the exhaust gas automatic processing equipment is adopted for effective mixing, interception, and adsorption on paint, dust, organic matters, and peculiar smell in exhaust gas, purifying effect is improved, purifying rate is accelerated, and high market application value is achieved.

The invention discloses a film-covering type plastic paperboard. The film-covering type plastic paperboard at least composed of following five layers of boards, namely, two layers of plastic films, two layers of leatheroid and a layer of wave-shaped PP plastic board in a composited mode, wherein the wave-shaped PP plastic board is arranged in the middle layer, the two layers of leatheroid are arranged on the upper face and the lower face of the wave-shaped PP plastic board correspondingly, and the two layers of plastic films are arranged on the outer surfaces of the two layers of leatheroid correspondingly. The edges of the wave crests and the wave troughs of the wave-shaped PP plastic board are coated with glue, and the wave-shaped PP plastic board and the leatheroid arranged on the upperface and the lower face of the wave-shaped PP plastic board are connected through the glue. In the mode of backing adhesive or in the mode that the surface of the leatheroid is coated with the glue,the plastic films and the whole surfaces of the leatheroid are pasted. The edge of the board formed by the two layers of plastic films, two layers of leatheroid and the layer of wave-shaped PP plasticboard in a composited mode is subjected to glue filling for sealing or provided with an edge sealing strip for sealing through bonding, and the sealing and waterproof effects are achieved.

The invention discloses a smoke dust self-removal type boiler tail gas emission pipeline. The smoke dust self-removal type boiler tail gas emission pipeline comprises a gas exhaust tube, wherein an arc-shaped slot is formed in the side wall of the gas exhaust tube; a glass tube is fixedly connected in the arc-shaped slot; a silicon steel piece is arranged in the glass tube; the side wall of the silicon steel piece is equipped with a silk layer; the silicon steel piece is rotatably connected in the glass tube through a spring shaft; a cylinder sleeves outside the glass tube; the cylinder is rotatably connected onto the inner wall of the arc-shaped slot; a plurality of through holes are formed in the side wall of the cylinder; and two electromagnets are fixedly connected on the side walls ofthe gas exhaust tube. The silicon steel piece swings back and forth in the glass tube, and the silk layer on the side wall of the silicon steel piece rubs with the glass tube continuously, so that static electricity can be generated on the surface of the glass tube, smoke gas in flowing tail gas in the exhaust tube can be adsorbed, smoke dust does not need to remove with special tail gas dust-removal equipment; and moreover, smoke dust accumulation is not generated in the gas exhaust tube, so that tail gas emission efficiency and boiler combustion efficiency of the gas exhaust tube are improved.

The invention provides a preparation method of a defluorination composite fiber membrane, which comprises the following steps: carrying out electrostatic spinning by using polyvinylidene fluoride andchitosan as spinning raw materials to prepare a composite fiber membrane, and treating the obtained composite fiber membrane in a Ca<2+>-containing calcium source solution to obtain the defluorinationcomposite fiber membrane. The invention also provides the defluorination composite fiber membrane, and application, an activation method, and a regeneration method thereof. The defluorination composite fiber membrane provided by the invention has better adsorption performance and good regeneration performance, can be recycled for a long time, greatly saves the cost, and can be suitable for treating fluorine-containing water bodies in various fields and in various scales. The preparation method has the advantages of accessible raw materials, low cost and simple technique, and is suitable for large-scale industrial production and use.

The invention belongs to the field of organic synthesis, and particularly relates to a high-acidity solid sulfonic acid catalyst for catalyzing aromatic compound nitrification, and a preparation method thereof. The preparation method of the catalyst comprises the following steps: 1, preparing three-dimensional mesoporous silica (3D-SiO2); 2, carrying out complete phenylation on the surface of thethree-dimensional mesoporous silica by using phenylsilane to obtain phenylated three-dimensional mesoporous silica (3D-SiO2-Ph); 3, sulfonating the phenylated three-dimensional mesoporous silica to obtain benzenesulfonic acid functionalized three-dimensional mesoporous silica (3D-SiO2-Ph-SO3H); and 4, catalyzing aromatic compound nitrification by using the 3D-SiO2-Ph-SO3H as a catalyst so as to cleanly synthesize the nitro derivative of the aromatic compound.

The invention discloses an anti-blocking shower nozzle. The anti-blocking shower nozzle comprises a shower nozzle body. The upper end of the shower nozzle body is fixedly connected with a water pipe communicating with the interior of the shower nozzle body. A plurality of through grooves communicating with the interior of the shower nozzle body are formed in the lower end of the shower nozzle body. Discs are rotatably connected into the through grooves in a sealed mode. First spray holes and second spray holes which perpendicularly intersect with one another and communicate with one another are formed in the side walls of the discs. Driving devices used for driving the discs to rotate are mounted in the first spray holes and the second spray holes. According to the anti-blocking shower nozzle, when the exposed spray holes are blocked, the water pressure borne by sliding blocks on the two inner sides of the spray holes is increased and pushes the sliding blocks into sliding grooves, anda string is pulled to drive the discs to rotate by 90 degrees when the sliding blocks move into the sliding grooves, so that the other intact spray holes are made to communicate with the interior ofthe shower nozzle body, and the blocked spray holes are automatically replaced with new spray holes.

The invention discloses a material for removing bromate and precursors thereof in water, and a preparation method and application thereof. The method comprises the following steps: (1) in a nitrogen protective atmosphere, swelling resin in a FeCl3.6H2O ethanol-water mixed solution, then adding a FeCl2.4H2O ethanol-water mixed solution, performing mixing with stirring, and then performing ultrasonic treatment, so that Fe<3+> and Fe<2+> are uniformly distributed in macropores of the resin; (2) in the nitrogen protective atmosphere, dropwisely adding a sodium hydroxide solution into the mixed solution obtained after the ultrasonic treatment in the step (1), performing a stirring reaction, and performing heating to 60-65 DEG C for a further reaction; and (3) after the reaction is completed, performing cooling to room temperature, performing filtration, performing washing, and performing drying to obtain magnetized resin which is the material for removing bromate and precursors thereof in water. The magnetized resin is applied to removal of bromate and precursors thereof in water; and the material can be recycled for a long time, and has the advantages of high removal efficiency, high separation speed and the like.

The invention relates a machining process of a high strength fire-resistant one-way valve, and belongs to the technical field of valve devices. The machining process of the high strength fire-resistant one-way valve includes the following steps that (1), material batching is conducted; (2), raw material smelting is conducted; (3), cooling of alloy solution made in the last step and formation of alloy are conducted; (4), secondary smelting of the alloy made in the last step in the smelter and formation of the alloy solution are conducted; (5), forging is conducted; (6), carburizing process is conducted; (7), quenching is conducted; (8), tempering is conducted; (9), grinding and polishing of a valve body are conducted; (10), the surface of the valve body is varnished by fire retardant coating; and (11), a valve plug is put into the valve body varnished with the fire retardant coating, and the high strength fire-resistant one-way valve is produced. The machining process of the high strength fire-resistant one-way valve improves the mechanical strength and the fire resistance performance of the high strength fire-resistant one-way valve through heat treatment process and varnishing ofthe fire retardant coating, and loss and pollution caused by liquid or gas leakage from a pipeline can be prevented when the fire happens.

The invention discloses a high-selectivity ion pair type extraction agent and a method for extracting wet-process phosphoric acid by using the high-selectivity ion pair type extraction agent. The high-selectivity ion pair type extraction agent is prepared from the following components in mass fraction: 1-10% of aliphatic amine or quaternary ammonium salt, 20-79% of normal butanol, and 20-79% of isooctyl alcohol, n-butyl ether or high-carbon ketone. The method comprises the steps of defluorinating and decolorizing wet-process crude phosphoric acid, performing 6-10-level counter-current extraction on the extraction agent and the crude phosphoric acid with the ratio of (2-5):1, adding sulfuric acid in a 6-level or 7-level crude phosphoric acid inlet, washing extract phase, reextracting with deionized water to obtain strip liquid, purifying the strip liquid and concentrating to obtain industrial grade phosphoric acid. According to the invention, the ion pair type organic matter with strong polarity is used as extraction agent polarity regulator, has high extraction capacity and stable performance, can be cycled for a long time, can be used for extraction at room temperature and is energy-saving; the initial mass fraction of P2O5 in strip liquid is more than 38.0, the evaporation capacity of concentrated acid is low, the extraction rate is more than 86%, and more than 19kg of extraction agent is consumed by 85% phosphoric acid per ton.