56results about How to "To achieve the purpose of removal" patented technology

The invention discloses a method for purifying flue gas through activating persulfate by ozone, and an apparatus thereof. Ozone in the flue gas contacts with persulfate in a solution in a bubbling-spray two stage reactor to generate sulfate radicals and hydroxy groups having strong oxidizability in order to oxidize and remove SO2, NOx, mercury, H2S and VOCs in the flue gas; and a reaction product solution enters a mercury separation tower to remove mercury, a mercury removed sulfuric acid and nitric acid solution enters an ammonia feeding tower, an ammonium sulfate and ammonium nitrate solution generated through the above reaction enters a product crystallization tower, and a flue gas waste heat utilizing device is used to evaporate and crystal recyclable agricultural fertilizers ammonium sulfate and ammonium nitrate. In the invention, ozone is adopted to induce persulfate to generate the sulfate radicals and hydroxy groups having extremely strong oxidizability, and the oxidbillities of the sulfate radicals and the hydroxy groups are second to that of fluorine, and are far higher than that of single ozone or persulfate, so the five pollutants can be efficiently simultaneously removed.

The invention discloses a method for purifying and removing chlorides contained in a chlorine-containing industrial mixed gas and recovering light hydrocarbon, and the method comprises a pressure-swing adsorption and / or temperature swing adsorption method. An adsorptive separation system which comprises two or more than two adsorption towers filled with adsorbents and a series of program control valves absorbs and fine removes the chlorine-containing industrial mixed gas; a tail gas is respectively subjected to the following steps of: adsorption, reverse release, normal-temperature evacuation or heating flushing and filling increase in the adsorption towers under the action of the program control valves; the adsorption towers is operated according to a sequence circulating and time sequence alternating mode; the outlets positioned on the upper ends of the adsorption towers control the total content of the chlorides to be less than 5 ppm, so that a purified gas or other target product gases are obtained after the chlorides are purified and removed. The method disclosed by the invention can be used for fine purifying and removing various organic chlorides, chlorine hydride and chlorine which are contained in a dichloroethane synthetic tail gas synthesized by directly chloridizing a refining and chemical dry gas and dilute ethylene or other chlorine-containing industrial mixed gases and recovering the light hydrocarbon or the other target product gases.

The invention relates to a preparation method of fossilized active sludge and a micro-sewage treatment method in the technical field of environmental protection. The preparation method of fossilized active sludge comprises the following steps: dissolving a polyethylene glycol prepolymer in water; adding active sludge and stirring; then, adding a bis-acrylamide crosslinking agent and benzoin dimethyl ether and uniformly mixing to obtain a solution; and illuminating the solution under an ultraviolet light source, cutting and washing to obtain the fossilized active sludge. The micro-sewage treatment method by utilizing the prepared fossilized active sludge comprises the following steps: filling the fossilized active sludge in a reactor; and adding sewage to the reactor for aeration; and treating the sewage to obtain purified water. The fossilized active sludge particles are convenient to prepare, have low cost, and have high efficiency of removing ammonia nitrogen and organic matter whenbeing applied to a micro-sewage source; meanwhile, required equipment is simple and is easy to manage and maintain.

A device for wiping off carbon dioxide in water body of fishing industry, comprising a body, the upper part of which is provided with an annular water spray device connected with a water inlet; the centre of lower part inside the body is provided with an aerating apparatus connected with a gas inlet; the middle part inside the body is provided with a filler cavity; the top of the body is providedwith a gas-water separator and an exhaust mask component; one side of the lower part of the body is provided with an outlet for clean water; and the bottom of the body is provided with an exhaust pipevalve for depositing sewage. The water to be treated in a fish pond or a fish container is transported to the annular water spray device through the water inlet; water flow uniformly sprays to form multilevel mist water curtain along the horizontal diameter of the annular water spray device and sprinkles down; meanwhile air filtered is transported into the aerating apparatus through the gas inletto release the micro bubbles uniformly; top-to-bottom water flow closely contacts with the gas flow moving in the opposite direction and realizes gas exchange; and a secondary action is carried out between ascending gas flow and water curtain, and carbon dioxide is discharged outside through a vent hole on the exhaust mask, thus realizing the purpose of the invention.

The invention discloses an electrolytic filtering / squeezing integrated sludge dewatering machine which comprises a primary squeezing and filtering region, an electrolytic filtering region, an electrolytic squeezing region and an external direct current power source, wherein the primary squeezing and filtering region, the electrolytic filtering region and the electrolytic squeezing region are sequentially arranged with one anther by taking a frame as a carrier. The sludge fallen from a hopper is primarily squeezed and filtered to remove the free water contained in the sludge. A driven upper filter strip and a driven lower filter strip are respectively and externally leaned against an upper squeezing strip and a lower squeezing strip connected the two poles of a direct current power source, so that the sludge clamped between the upper squeezing strip and the lower squeezing strip is electrolyzed, and the interstitial water and the cellular water in the sludge flow to the negative pole when the electric charge flows, i.e. the electrophoresis. The incompletely-dried sludge is carried into the electrolytic squeezing region and is forced under the condition that the sludge is stilled electrolyzed to accelerate the dewatering. By sequentially reducing the diameters of a plurality of the roll shafts and by adopting an installation technology measure that the adjoining roll shafts are installed in a misplaced way up and down, the machine can dewater by sequentially forcing, so that the dryness of a sludge cake is improved. The machine is particularly suitable for treating the biochemical active sludge precipitated by the urban domestic sewage or the industrial sewage.

The invention discloses a method of using lipase to treat secondary gummy substances in paper pulp and white water produced in papermaking with waste paper. The lipase is alkaline lipase with a pH value of 7.5 to 9.0, enzyme activity of more than 100 U / mL, a hydrolysis rate of triglyceride of no less than 95% and transesterification and lipogenesis rates of less than 3%. A treating method for the paper pulp comprises steps consisting of adding the lipase accounting for 0.001 to 0. 5% of dry weight of the paper pulp into the paper pulp having a concentration adjusted to be 2 to 5%, carrying out treating and filtering, centrifuging and detecting the treated pulp. A treating method for the white water comprises steps consisting of adding the lipase accounting for 0.001 to 0. 5% of dry weight of the white water into the papermaking white water, carrying out treating and filtering, centrifuging and detecting the treated white water. According to the invention, the lipase is utilized to fundamentally degrade the gummy substances and mitigate deposition tendency of the gummy substances so as to remove the gummy substances, so the problem of pollution by secondary gummy substances is thoroughly overcome; and the method is simple to operate, has a substantial removal effect and enables the quality of papermaking with waste paper to be improved and production cost to be reduced.

The invention discloses a flight system for removing a hanging object on a transmission line and a working method of the flight system. The flight system comprises a control device, a flight platform and an ignition system, wherein the flight platform and the ignition system are both connected with the control device, the ignition system is arranged on the flight platform and comprises a fuel injection device and an ignition device, the fuel injection device comprises an injection part used for injecting fuel to the hanging object, the ignition device comprises an igniter, the injection part can be opposite to the hanging object, and the igniter can be opposite to the hanging object. In the process of removing the hanging object on the high-altitude transmission line, the flight platform flies to a high position and gets close to the hanging object, then the fuel is injected to the hanging object, then laser rays are burst to the hanging object through the igniter, and the hanging object is subjected to spontaneous combustion at a high temperature to be removed. Thus, the removal efficiency of the hanging object can be greatly improved, and meanwhile work of the flight system is safer, higher in reliability and convenient to control.

The present invention relates to a method of cooperative control of alga in a water body comprising silver carp, bighead carp, grass carp, cladophora and daphnia hyaline, which relates to a water treatment method and solves the problem of water quality depravation caused by the descent of water body transparency due to the hypertrophy of alga. The method comprises the steps of that: silver carp, bighead carp and grass carp are cultured in eutrophication water body, and a floating net cage is arranged therein; cladophora attached grows in the nylon wire net of the floating net cage, and daphnia hyaline grows inside of the floating net cage. The present invention has the advantages of easy operation, high efficiency, economy and shortcut and easy control, and can be popularized on a large scale. In the present invention, the removal percentage of phosphor is 60~66%, the average removal percentage of alga is 68~73% and the average removal percentage of chlorophyll is 63~66%.

The invention discloses an electrolytic filtering / squeezing integrated sludge dewatering machine which comprises a primary squeezing and filtering region, an electrolytic filtering region, an electrolytic squeezing region and an external direct current power source, wherein the primary squeezing and filtering region, the electrolytic filtering region and the electrolytic squeezing region are sequentially arranged with one anther by taking a frame as a carrier. The sludge fallen from a hopper is primarily squeezed and filtered to remove the free water contained in the sludge. A driven upper filter strip and a driven lower filter strip are respectively and externally leaned against an upper squeezing strip and a lower squeezing strip connected the two poles of a direct current power source,so that the sludge clamped between the upper squeezing strip and the lower squeezing strip is electrolyzed, and the interstitial water and the cellular water in the sludge flow to the negative pole when the electric charge flows, i.e. the electrophoresis. The incompletely-dried sludge is carried into the electrolytic squeezing region and is forced under the condition that the sludge is stilled electrolyzed to accelerate the dewatering. By sequentially reducing the diameters of a plurality of the roll shafts and by adopting an installation technology measure that the adjoining roll shafts are installed in a misplaced way up and down, the machine can dewater by sequentially forcing, so that the dryness of a sludge cake is improved. The machine is particularly suitable for treating the biochemical active sludge precipitated by the urban domestic sewage or the industrial sewage.

The invention relates to a compound fertilizer with a double-control netting characteristic and a preparation method thereof. The compound fertilizer with the double-control netting characteristic consists of a fertilizer and a fertilizer nutrient lose control agent in a weight part ratio of (2-8):(80-98). The invention also provides the preparation method of the compound fertilizer with the double-control netting characteristic, which comprises the following steps of: mixing the fertilizer and the fertilizer nutrient lose control agent in the weight part ratio of (2-8):(80-98); and granulating to prepare the compound fertilizer with the double-control netting characteristic. The compound fertilizer with the double-control netting characteristic has the shape of a flocculent sponge after being dissolved in water, and has the effects of netting fertilizer nutrients, controlling nutrient loss, performing exchange absorption and precipitating harmful heavy metal at the roots of crops.

The invention discloses a method for preparing a coal tar-based carbon material catalyst for combined removal of nitric oxide and mercury in coal-fired flue gas, belongs to the technical field of energy chemical engineering and aims to achieve combined removal of pollutants in coal flue gas. The method comprises the following steps: firstly, carrying out purification pretreatment on coal tar; andmixing with polyvinylpyrrolidone (PVP), and soaking into a SnCl2 and Mn<2+> ethanol solution to carry out in-situ carrying; and carrying out carbonization and oxidation in sequence, thereby obtaininga coal tar carbon material catalyst. The coal tar carbon material catalyst prepared by using the method is of a rich pore structure and has a high specific surface area. As the coal tar is adopted asa raw material, the raw material is cheap and easy to obtain, the prepared catalyst is high in mercury removal and denitration efficiency, that is, the efficiency is up to 95% or greater, the catalystis long in service life and good in regenerability and can be popularized and applied, and a novel technical scheme is provided for novel and efficient utilization of the coal tar, and can be popularized and applied.

The invention discloses a cutting fluid waste oil clearing device, and belongs to the technical field of cutting fluid waste oil clearing. The cutting fluid waste oil clearing device comprises a wasteoil collector vertical guide support seat and a waste oil collector, wherein the waste oil collector vertical guide support seat comprises a base and a waste oil collector vertical guide rail arranged above the base; the waste oil collector is provided with a guide hole, a waste oil collecting cavity, a buoyancy generating cavity, a counterweight placing disc, a counterweight and an oil discharging pipe; the guide hole is glidingly matched and connected with the waste oil collector vertical guide rail; openings are formed in the upper end lower ends of the waste oil collecting cavity, and comprise an oil liquid separation opening and an oil guide cavity and oil outlet opening; the oil liquid separation opening is positioned at the upper edge of the oil guide cavity and consists of a plurality of annularly distributed notches; the bottom edge of each notch is a flat edge, and is positioned at the same horizontal height; the oil outlet is an opening formed in the lower end of the oil guide cavity and is connected with an oil discharging pipe; the buoyancy generating cavity is positioned at the outer side of the waste oil collecting cavity. The cutting fluid waste oil clearing devicehas the advantages that the waste oil clearing efficiency is high; the work is stable and reliable; the continuous unintermitted automatic work can be realized, and the like.

The invention provides a texturing method of a monocrystalline battery and themonocrystalline battery prepared by the texturing method. The texturing method comprises the following steps: (1) polishing: polishing a monocrystalline silicon wafer in an alkali liquor, and enabling the weight reduction of the monocrystalline silicon wafer to be less than or equal to 0.4 g; (2) carrying out primary cleaning: cleaning the polished monocrystalline silicon wafer in the step (1) in a mixed solution of hydrogen peroxide and the alkali liquor, and then washing with water; (3) texturing; (4) carrying out secondary cleaning; (5) cleaning for the third time; and (6) lifting and drying the monocrystalline silicon wafer cleaned for three times in the step (5) to obtain the textured monocrystalline battery. Before an original texturing process, a silicon wafer is polished by using a low-concentration alkali liquor, a polished surface is cleaned by using hydrogen peroxide and weak base, and the textured surface is subjected to secondary modification after texturing so that the aim of removing organic matters and other impurities on the surface of the silicon wafer is fulfilled, and EL abnormality and electric leakage of the battery caused by pollution are avoided.

The invention relates to filler used for constructed wetland water treatment and a preparation method of the filler. The invention aims at providing a novel constructed wetland filler which is capable of realizing slowly releasing oxygen and reinforcing nitrogen and phosphorus removal and a preparation method of the filler. The filler used for constructed wetland water treatment is volcanic cinder particles which are loaded with a rare-earth nitrogen and phosphorus adsorbent and a slow-release oxygen material, and have particle diameters of 5-15mm. The filler can be used for increasing the sewage purifying capacity of the constructed wetland. And the preparation method has the characteristics of simple process, sufficient raw materials, low cost, and the like.

The invention relates to the field of drug manufacturing, and relates to a purification drying process of drugs, in particular to a freeze-drying process of insulin. According to the freeze-drying process of the insulin, the insulin is basically not influenced by the environment in freeze drying processes which contains prefreezing, primary drying and secondary drying. The insulin produced through the freeze-drying process is remarkably lowered than insulin produced through a conventional process in the impurity content and stable in quality, and the process is mature and feasible. According to the process, use of organic solvents is avoided, potential harmful effects on staff and the environment are eliminated, drying time is saved for 2-3 days, and industrial production efficiency is improved.

The invention discloses a novel zirconium nano hybrid material and an application method and belongs to the field of deep phosphorus removal in sewage. The preparation method of the material comprisesthe following steps: (1) dissolving ZrOCl2.8H2O into a solution containing water, concentrated hydrochloric acid and anhydrous ethanol so as to obtain a mixed solution; (2) adding a gel type strong basic anion exchange resin into the mixed solution, firstly performing soaking and performing stirring at the same time; (3) reheating and stirring the material until the material is not completely dry, then performing natural air drying so as to obtain a resin intermediate, transferring the resin intermediate to a NaOH solution, and performing continuous stirring; and (4) taking out the material,washing the material to be neutral, performing natural air drying, further transferring the material to a sodium chloride solution, performing continuous stirring, filtering out the material, washingthe material to be neutral, cleaning the material with anhydrous ethanol, and drying the material so as to obtain the zirconium nanometer hybrid material. The material disclosed by the invention is capable of achieving efficient removal and recovery of inorganic phosphorus of various forms, particularly has an excellent removal effect on condensed phosphate which is difficult to remove, and is beneficial to popularization.

The invention discloses a vertical long pipeline hoisting-type steel wire cleaning-up device and method. The cleaning-up device comprises an electromagnetic loop, an open-leg-type slip, a trash remover body shell, a hoisting steel wire, a cable and a motor. The trash remover body shell comprises an electromagnet, a pore channel located in the trash remover body shell, a nozzle located at the bottom of the trash remover body shell and a combination centralizer arranged on the outer wall of the trash remover body shell. The electromagnet can be connected with the electromagnetic loop or separated from the electromagnetic loop through magnetic force. The pore channel communicates with a water conveying pipe. By adoption of the cleaning-up method, the combination centralizer on the outer end face of the trash remover body shell and forward movable pulleys on the electromagnetic loop are adopted to achieve centered and smooth movement of the device in a construction pipeline, and working efficiency is improved by combining with the grinding effect of a rotating mild steel wire, the cavatition effect of an ultrasonic generator and the injection effect of the nozzle. Solid impurities on the wall face of a vertical long pipeline and the inside of the vertical long pipeline can be effectively removed.

The invention discloses a flue gas purification and adsorption device before desulfurization and denitrification, and relates to the technical field of industrial flue gas purification devices. The device comprises a middle ash collecting bin, an arch breaking unloader, a centrifugal fan, a plurality of long-bag low-pressure pulse bag-type dust removers, a blowing device and an ash storage bin, wherein the arch breaking unloader is mounted at the lower end of the middle ash collecting bin; a discharge port of the arch breaking unloader is connected with an air inlet of the long-bag low-pressure pulse bag-type dust collector through a connecting pipeline; one end of the connecting pipeline is connected with an air outlet of the centrifugal fan; an air inlet of the centrifugal fan is connected with a pipeline for conveying flue gas; and a mixing pipe section is arranged on the connecting pipeline. Through the designed flue gas purification and adsorption device before desulfurization anddenitrification, fine dust and small particles can be effectively controlled and tar in flue gas is adsorbed, so that the purpose of removing pollutants is completely achieved, the purpose of protecting the next procedure is achieved, and the problem that an existing multi-stage filter screen cannot filter out the small particles and the tar is solved.

The invention discloses a chemical cleaning agent and a preparation method thereof, and belongs to the technical field of equipment cleaning. The chemical cleaning agent is prepared from the followingraw material components in parts by weight: 3-8 parts of sodium dodecyl benzene sulfonate, 0.5-2.5 parts of hydroxypropyl guanidine gum, 1-5 parts of sodium tripolyphosphate and 20-50 parts of water.The invention also provides a preparation method of the cleaning agent. The chemical cleaning agent is wide in raw material source, low in cost, simple in preparation method and low in cleaning agentconsumption, and the cleaning cost is reduced; experiments prove that the cleaning agent disclosed by the invention has an obvious cleaning effect on hard dirt, does not corrode a rotary air preheater body, and ensures the service life of equipment on the premise of realizing efficient cleaning. Through the synergistic effect of the hydroxypropyl guanidine gum and the sodium dodecyl benzene sulfonate, the chemical cleaning agent is used for wetting, permeating and splitting hard scales, so that the aim of removing intractable hard scales is fulfilled, and equipment cannot be corroded.

The invention discloses activated carbon with high desulfurization efficiency, which is prepared by the following steps of: (1) modifying wood flour; (2) pre-modifying activated carbon; and (3) compounding the modified wood flour with the activated carbon; the activated carbon with high desulfurization efficiency prepared by the invention has good desulfurization efficiency; compared with common activated carbon, the adsorption efficiency of the activated carbon prepared by the invention on sulfur dioxide is obviously greatly improved, and the activated carbon can be better applied to flue gasdesulfurization treatment.

The invention relates to a preparation method of fossilized active sludge and a micro-sewage treatment method in the technical field of environmental protection. The preparation method of fossilized active sludge comprises the following steps: dissolving a polyethylene glycol prepolymer in water; adding active sludge and stirring; then, adding a bis-acrylamide crosslinking agent and benzoin dimethyl ether and uniformly mixing to obtain a solution; and illuminating the solution under an ultraviolet light source, cutting and washing to obtain the fossilized active sludge. The micro-sewage treatment method by utilizing the prepared fossilized active sludge comprises the following steps: filling the fossilized active sludge in a reactor; and adding sewage to the reactor for aeration; and treating the sewage to obtain purified water. The fossilized active sludge particles are convenient to prepare, have low cost, and have high efficiency of removing ammonia nitrogen and organic matter when being applied to a micro-sewage source; meanwhile, required equipment is simple and is easy to manage and maintain.

The invention relates to the technical field of food processing and particularly relates to instant millet porridge and a preparation method therefor. The method comprises the steps of subjecting millet to color-sorting impurity removal, then, removing surface bran layers through ultrasonic treatment and auxiliary low-temperature short-time soaking, subjecting water-absorbed millet to infrared-baking enzyme deactivation, then, carrying out heated gelatinization, rapidly cooling water-absorbed and complete-gelatinized millet porridge with cold air, spraying an oxidation resisting emulsion to surfaces, then, carrying out hot-air drying, sorting dried millet grains, and then, carrying out blending and nitrogen-charged packaging. The instant millet porridge is prepared from the following raw materials in percentage by weight: 90-95 of millet, 0.1-0.3 of citric acid, 5-10 of soluble soybean polysaccharides, 0.02-0.04 of theaflavin, 0.03-0.05 of curcumin and 0.3-0.5 of hydrolyzed soybean lecithin. According to the instant millet porridge produced by the method, oxidation of grease of the millet is effectively inhibited, and the product is high in rehydration speed, soft in texture, purein flavor, moderate in cost and convenient in eating.

The invention discloses a method for preparing a coal tar-based carbon material catalyst for combined removal of nitric oxide and mercury in coal-fired flue gas, belongs to the technical field of energy chemical engineering and aims to achieve combined removal of pollutants in coal flue gas. The method comprises the following steps: firstly, carrying out purification pretreatment on coal tar; andmixing with polyvinylpyrrolidone (PVP), and soaking into a SnCl2 and Mn<2+> ethanol solution to carry out in-situ carrying; and carrying out carbonization and oxidation in sequence, thereby obtaininga coal tar carbon material catalyst. The coal tar carbon material catalyst prepared by using the method is of a rich pore structure and has a high specific surface area. As the coal tar is adopted asa raw material, the raw material is cheap and easy to obtain, the prepared catalyst is high in mercury removal and denitration efficiency, that is, the efficiency is up to 95% or greater, the catalystis long in service life and good in regenerability and can be popularized and applied, and a novel technical scheme is provided for novel and efficient utilization of the coal tar, and can be popularized and applied.

The invention discloses an albite concentration method, and relates to the technical field of albite processing. The method comprises the following steps of raw ore cleaning, screening, smashing, oregrinding, micro-organism processing, flotation and dewatering. The micro-organisms are brevibacterium flavum and bacillus licheniformis. In the floating step, water is added into ore sand after deironing to produce ore pulp with concentration of 35-45%, the pH of the ore pulp is adjusted to be 1-2, an agentia of 3-5% is added for stirring until bubbling appears, foam is scraped out, and dewateringis conducted until water content is no more than 15%. The agentia comprises an aloe extract, an eucalyptus leaf extract, citric acid and an N-dialkyl double quaternary ammonium salt. Iron titanium impurities and black mica in the albite can be effectively removed, and magnesium oxide can be further removed. Albite powder with high whiteness, low iron, low titanium, low mica and high quality can be produced. The adopted floating agentia is environmentally friendly, and is non-toxic and pollution-free. The whiteness of the obtained albite powder is more than 61, and the method is better than atraditional method.

The invention provides a flexible joint thin rib bottom electric corrosion layer removal device, and belongs to the technical field of polishing in machining. The device aims to solve the problem that an electric corrosion layer on a thin rib bottom gap of a flexible joint can not be removed through existing conventional machining, and performance of the flexible joint is affected. A notch groove in a first circular pipe and a notch groove in a second circular pipe on an abrasive stream pouring plug are both communicated with the thin rib bottom gap of the flexible joint. A left port of a piston cylinder assembly is communicated with a tail port of the first circular pipe through a first electromagnetic switch valve, and a right port of the piston cylinder assembly is communicated with a tail port of the second circular pipe through a second electromagnetic switch valve. A stirring head of a stirring assembly is soaked in fluid abrasive machining liquid in a container groove. A reciprocating moving end of a reciprocating mechanism assembly is connected with a piston rod of the piston cylinder assembly. By means of the flexible joint thin rib bottom electric corrosion layer removal device, non-contact machining can be performed on parts, difficult to machine, at the bottom of a blind hole of the flexible joint, and the aim of removing an electric corrosion layer is achieved.

The invention discloses a method for detecting a piwi-interacting ribonucleic acid (piRNA) in gastric juice. The method comprises the following steps of: extracting and neutralizing the gastric juice; releasing the RNA; extracting with chloroform; precipitating with isopropyl alcohol; washing with ethanol; performing reverse transcription of the RNA; detecting with a polymerase chain reaction (PCR); and the like, wherein sodium hydroxide solution is used for liquefying viscous components in the gastric juice to suspend mucoprotein and polysaccharide in the solution and neutralizing the gastric juice in the method; trypsin is added for digestion, so that proteins such as the mucoprotein and the like can be hydrolyzed and cell components in the gastric juice are loosened to bring convenience to centrifugal separation; Trizol solution is added for repeated blowing and beating; the RNA is fully released and is separated from impurities such as the polysaccharide, the mucoprotein and the like, so that the problem of interference of acidity, the polysaccharide, the mucoprotein and the like in the gastric juice on the extraction of the RNA is solved; thus, the interference of the impurities such as the polysaccharide, the mucoprotein and the like in the gastric juice can be eliminated, the piRNA in the gastric juice is effectively extracted, and fluorescence quantitative PCR detection is performed on the extracted piRNA.