40results about How to "Avoid secondary effects" patented technology

The invention provides a dual-gate field-effect transistor which comprises a device layer, a source, a drain, a channel region positioned between the source and the drain, a first gate structure and a second gate structure, wherein the device layer comprises a first surface and a second surface which are opposite to each other; the source and the drain are positioned in the device layer, isolated mutually and have different conduction types; the channel region sequentially comprises a first pocket injection region, a source connection region and a second pocket injection region from the first surface to the second surface of the device layer, the first and the second pocket injection regions are electrically connected with the drain, and the source connection region is electrically connected with the source; the first gate structure is positioned on the first surface of the device layer and corresponds to the position of the first pocket injection region; and the second gate structure is positioned on the second surface of the device layer and corresponds to the position of the second pocket injection region. The dual-gate field-effect transistor has high response speed and sensitive switching property, and can meet the demand of reducing the energy consumption after scaling down a device under small size and avoid the production of a series of secondary effects.

The invention relates to a green field effect transistor and a manufacturing method thereof, wherein the green field effect transistor comprises a silicon on insulator, a source electrode, a drain electrode and a channel body, wherein the silicon on insulator comprises a silicon substrate as well as a buried oxide layer and top layer silicon which are sequentially located on the silicon substrate; the source electrode and the drain electrode are located in the top layer silicon and isolated from each other and have different doping types; the cylindrical channel body is located between the source electrode and the drain electrode and sequentially comprises a source connector and a pocket injection layer from a cylindrical core to outside, one end of the channel body is connected to the source electrode, and the other end of the channel body is connected to the drain electrode; the source connector is electrically connected with the source electrode, and the pocket injection layer is electrically connected with the drain electrode; and a grid electrode structure located on the surface of the pocket injection layer of the channel body comprises a grid dielectric layer and a grid electrode on the surface of the grid dielectric layer. The green field effect transistor has the advantages of high response speed and sensitive switching characteristic, satisfies the requirements of a small size scaled-down device on reducing energy consumption and avoids generating a series of second-order effects.

The invention discloses an electric steamer condensate water back flow structure. The structure comprises an inner container, a steam generator, a water tank and a steam condensation box. The steam condensation box is sequentially provided with an upper space, a middle space and a lower space from top to bottom; a plurality of middle exhaust holes communicated with the upper space are formed between the upper space and the middle space, a plurality of bottom exhaust holes communicated with the lower space are formed between the middle space and the lower space, the middle exhaust holes correspond to the bottom exhaust holes one to one, the middle exhaust holes and the bottom exhaust holes corresponding to each other are communicated through corresponding hole columns, multiple hole columnsare arranged in the middle space for water storage, and the upper space is communicated with the lower space through multiple hole columns; the upper space is communicated with the external world through a plurality of top exhaust holes; the middle space is communicated with the steam generator and the water tank; the lower space is communicated with a steam cooking chamber and a steam generator.The human body can be effectively prevented from being scalded, water resources are saved, frequent water supplying is avoided, and the cooking efficiency is improved.

The invention discloses a duckweed collection and feed production device for aquaculture. The duckweed collection and feed production device comprises a floating ship, an even raking box and a dewatering box body are fixedly installed on the top surface of the floating ship, a second enclosing rod is rotatably installed on a first enclosing rod, a first auxiliary rod is installed on the left side surface of a fixing block in a hinged mode, a second auxiliary rod is installed on the second enclosing rod in a hinged mode, when a winding motor is started, the winding motor drives a winding drum to rotate, the winding drum rotates to pull a pulling wire, the pulling wire can pull the second enclosing rod and the first enclosing rod to gather duckweeds in the middle, working can be convenient to conduct in the small water surface, the working cost is saved, the normal growth of fishes and shrimps in a pond is protected, the collected duckweeds can be pretreated as fishes and shrimps feed, water plants and the duckweeds can be separated, thus duckweed collecting cannot be affected by the water plants, when the duckweeds are collected, a sucking pump is used for collecting, and the collection efficiency is improved.

The utility model relates to a producing method for new gyroscope signal reading graphics, which achieves a micron-level signal reading graphic by a sputtering deposition, a photolithography and an ion beam etching. The utility model has the following processing steps: 1. gaining the metal film by sputtering on the top flat surface of the gyroscope rotor plane; 2. spin coating photoresist on the metal film; 3. gaining photoresist graphics by UV exposure and development; 4. conducting ion beam etching with an incident angle of 15 to 30 degrees to remove residual photoresist, and signifying metal signal reading graphics in the rotor.

The invention relates to a rotary milling cutter head, which includes a tray and an ash discharger. An annular connecting ring is arranged on the tray, and a milling cutter and a chip removal cutter are arranged in an annular array on the connecting ring; the milling cutter includes a milling cutter There are a number of prismatic cutting protrusions in a linear array on the milling block, and buffer grooves are processed at the positions between the corresponding cutting protrusions on the milling block; the chip removal knife is installed in the drain hole that runs through the connecting ring , the chip removal knife includes several pieces of elastic blades, the elastic blades are fixed on the outer edge of the connecting ring corresponding to the discharge hole through the connecting seat, the axis of the elastic blade is inclined to the radial axis of the connecting ring, and a chip removal blade is provided between the chip removal knives Gap; the ash discharger includes ash discharge impeller, on which a circular array is provided with several arc-shaped impeller blades, a diversion cover is also provided on the ash discharge impeller, and a discharge port is arranged in the middle of the ash discharge cover. The middle part of the ash discharge impeller is rotatably connected with the middle part of the tray through a bearing, and an inertia block is also fixedly connected with the middle part of the ash discharge impeller.

The key ideal of the invention is: setting a power detecting circuit, control circuit and a switching circuit in a communication single-chip without a native power supply; the power detecting circuit is used in detecting a power supplying signal and outputting a power detecting signal to the control circuit; the control circuit is used in comparing the power detecting signals from power detecting circuit with a service switching signals from outside, and outputting a control signal to the switch circuit to make power switch.

The invention discloses a protective structure for an existing tunnel under the working condition of close-range crossing by a shield and a construction method of the protective structure, and belongsto the technical field of subway tunnel structure reinforcement and protection. The protective structure is arranged at a grouting hole of a segment; a protective cover is fixed to the inner surfaceof the segment, a pumping tube communicates with the protective cover and a vacuum pump; an opened metal sleeve is arranged in the protective cover, the top end of the opened metal sleeve is in contact with the protective cover, the bottom of the opened metal sleeve is connected with one end of a metal pipe section, the metal pipe section is embedded in the grouting hole, and a pressure relief opening is formed in the position, near the grouting hole, of the opened metal sleeve in the circumferential direction; a pressure spring is arranged inside the opened metal sleeve, the top end of the pressure spring is fixed to the protective cover, and the bottom end of the pressure spring is connected with a pressure relief piston; the pressure relief piston is arranged in the metal pipe section;on the outside of the tunnel, one end of a glass fiber reinforced plastic hollow anchor rod is connected with the metal pipe section in the grouting hole, and reserved small holes are formed in the surface of the glass fiber reinforced plastic hollow anchor rod in the circumferential direction. According to the protective structure for the existing tunnel under the working condition of close-rangecrossing by the shield and the construction method of the protective structure, the dual functions of water pressure draining and earth pressure draining are realized, and the glass fiber reinforcedplastic hollow anchor rod is used for connection and reinforcement.

The invention discloses a frequency active support strategy based on a wind storage system, and the strategy is characterized by comprising the following steps of: S1, wind speed partitioning; S2, frequency dead zone correction; S3, unit reactive power compensation; and S4, determination of a cooperative control strategy; the wind speed interval where a draught fan is located is judged according to the running state of the draught fan, and the power of the wind storage system is adjusted to achieve frequency supporting, while the unit characteristics and the energy storage system performance are fully utilized, secondary falling of system frequency caused by draught fan power recovery, load fatigue caused by frequent action of pitch angle mechanical parts and economic loss caused by limited power frequency modulation to grid-connected operation of a wind power plant are avoided.

The invention relates to an Ivc cage tool automatic water replenishing device. The Ivc cage tool automatic water replenishing device comprises a plurality of Ivc cage cases and a frame body, wherein aplurality of rows of accommodating cabinets for accommodating the Ivc cage cases are neatly arranged on the frame body from top to bottom; a drinking water bottle is arranged on each Ivc cage case inan inserting manner; a water transporting pipe for transmitting a water source is arranged on one side of the frame body; a water filling pipe extends from the water transporting pipe to each row ofthe frame body; each drinking water bottle comprises a water outlet end allowing an experimental animal to suck and a water inlet end for injecting water; a connecting pipe extends from each water filling pipe to the corresponding water inlet end, and communicates with the corresponding water inlet end to realize the conducting of the corresponding drinking water bottle to the corresponding waterfilling pipe; a plugging piece for automatically plugging each connecting pipe when water in the corresponding drinking water bottle is full is arranged in the corresponding water inlet end; and a separation piece for intermittently separating water flow in each water filling pipe is arranged at a joint of each water filling pipe and the water transporting pipe. The Ivc cage tool automatic water replenishing device disclosed by the invention is simple in structure and convenient in operation, and is suitable for most Ivc experiment occasions, and the problem that in the prior art, the drinkingwater bottles need to be repeatedly discharged for water replenishing is solved.

The invention provides multipurpose cleaning powder. The multipurpose cleaning powder is composed of, by the mass percentage, 15-25% of sodium carbonate, 15-25% of anhydrous sodium sulfate, 5-15% of citric acid, 0-5% of tea seed powder, 0-5% of saponin powder, 2-10% of glucoside, 8-16% of betaine, 5-18% of a nonionic surfactant and 5-18% of AES. The cleaning powder can be used for cleaning daily hard surfaces (such as ceramic tiles, glass, bathroom accessories, stainless steel and kitchen ware), tableware, clothes and the like, and is high in cleaning efficiency; alkyl glycoside is a mild active agent and has the advantages of being good in biodegradability, free of peculiar smell, high in activity, free of heavy metal, low in corrosivity and high in dirt-removing power, washed water can be naturally decomposed, a sewer is dredged, a water source is purified, and environmental protection is facilitated; the cleaning power on tableware is greater than that of a conventional common detergent, the detergency on kitchen oil stains is greater than 89%, and the detergency on clothes is greater than the detergency ratio of a relative standard laundry detergent.

The invention discloses a metal plate tapping machine for luggage processing, and relates to the technical field of luggage processing equipment.The metal plate tapping machine comprises a workbench, the workbench is fixedly connected with a supporting frame, the supporting frame is provided with a drilling mechanism, the drilling mechanism comprises a driving air cylinder, and the output end of the driving air cylinder is fixedly connected with a mounting block; a drilling motor is fixedly connected into the mounting block, the output end of the drilling motor extends out of the mounting block and is coaxially and fixedly connected with a drill bit, and when the drilling device is used for drilling a plate, the protective cover makes contact with the plate before the drill bit, and an extrusion auxiliary fixing effect is formed on the plate; meanwhile, the ventilation cavity is defined, so that a blocking effect is formed on waste chips generated by drilling, and the waste chips are prevented from splashing all around; and a rotating fan connected to the output end of the drilling motor rotates along with rotation of the output end of the drilling motor, the rotating fan outputs airflow to the drill bit, the air cooling effect on the drill bit is achieved, and damage caused by overheating in the high-speed drilling work of the drill bit is avoided.

Kit and method for the pre mortem in vitro detection of Alzheimer's disease The invention relates to a detection kit for Alzheimer's disease based on the vitro identification of the presence of biomarkers in the remains normally discarded after crystalline lens surgery. The kit can be used for the pre mortem detection of the disease, even before the appearance of clinical symptoms. Among the available biomarkers, the biomarker of choice is beta-amyloid peptide, for which several methods of sample processing and labelling for the presence of the biomarker may be used. Embodied in the invention is also the use of the crystalline lens remains discarded during surgery, often cataract surgery, to prepare a method for the in vitro pre mortem detection of Alzheimer's disease.

The invention discloses a thread-rolling machine capable of preventing sweeps from leaving on thread-rolling plates. The thread-rolling machine comprises a rack, the rack is provided with the fixed thread-rolling plate and the movable thread-rolling plate, the two ends of the fixed thread-rolling plate are an inlet and an outlet for screws correspondingly, a first sweep removing spraying pipe is arranged at the position, corresponding to the inlet, of the rack, a second sweep removing spraying pipe is arranged at the end, corresponding to the outlet, of the movable thread-rolling plate, the axes of the first sweep removing spraying pipe and the second sweep removing spraying pipe are the same as the axes of the screws, the first sweep removing spraying pipe and the second sweep removing spraying pipe are provided with spraying openings, the spraying opening of the first sweep removing spraying pipe faces the movable thread-rolling plate, and the spraying opening of the second sweep removing spraying pipe faces the fixed thread-rolling plate. The thread-rolling machine can remove the sweeps on the thread-rolling plates, cannot affect the screws, ensures the thread rolling quality ofthe screws, and has the cooling effect.

The invention discloses an environment-friendly garbage can with a lighting function, and relates to the technical field of environment-friendly equipment. The environment-friendly garbage can specifically comprises a can body, wherein the can body is provided with a base; the middle of the can body is provided with a recyclable chamber and an unrecyclable chamber; the bottom of the recyclable chamber and the bottom of the unrecyclable chamber are provided with leakage plates; the recyclable chamber is arranged on the left side of the can body; a loudspeaker, a recyclable mark, an LED lamp and an infrared sensor are sequentially arranged on the outer wall of the front side face of the recyclable chamber from bottom to top; the unrecyclable chamber is arranged on the right side of the can body; and a loudspeaker, an unrecyclable mark, an LED lamp and an infrared sensor are sequentially arranged on the outer wall of the front side face of the unrecyclable chamber from bottom to top. The environment-friendly garbage can has the advantages that the environment-friendly garbage can is simple in structure and convenient to use, solar energy can be used, and voice reminding can be achieved; and meanwhile, mosquito killing and sterilization can be achieved, and lighting can be provided at night. In addition, the environment-friendly garbage can is convenient to move.

The present invention relates to a submarine landslide physical model test device and working method, comprising: a model box: a wave-making mechanism and a wave-dissipating mechanism are respectively arranged at both ends of the model box; The slide rail is slidingly connected with the wave-making box, the wave-making box is connected with the wave-making driving mechanism, and the side wall of the wave-making box on the side where the wave-dissipating mechanism is located is set at an acute angle with the horizontal plane; the wave-dissipating mechanism: includes at least one The wave-dissipating drum, the wave-dissipating drum is connected with the wave-dissipating driving mechanism; the monitoring mechanism: including multiple fiber grating sensors embedded in similar materials, multiple fiber grating sensors are connected in series with optical fibers, and the optical fibers are connected with the optical fiber regulator. The experimental device invented is of great significance to the study of submarine landslides.

The invention relates to the technical field of network information devices, in particular to a PCB (printed circuit board) case cooling device and a case. The cooling device is used for mounting on a PCB and comprises heat conduction portions for contacting with heat conduction layers on the PCB, each heat conduction portion extends to one side far away from the corresponding heat conduction layer from the heat conduction layer to form a heat conduction rib, plate-shaped cooling portions are connected at the extending tail ends of the heat conduction portions, the cooling device directly contacts with the PCB, a natural cooling mode of the PCB is changed, the cooling device is rapider and more uniform in cooling by the aid of a heat conduction device and solves the problems of slow cooling of a natural cooling mode in the prior art, so that the PCB is excellent in performance and safe and efficient to run, all heat conduction ribs and cooling boards are connected into an integral frame structure, each functional unit on the PCB is enclosed a mutual isolated closed space, so that signals in the case cannot be mutually interfered, and the cooling device has better electromagnetic shielding effects on each functional unit and the whole printed circuit board.

The invention provides a multi-purpose cleaning powder, comprising the following components in mass percentage: 15-25% of soda ash, 15-25% of sodium sulfate, 5-15% of citric acid, 0-5% of tea seed powder, saponins Powder 0‑5%, Glycoside 2‑10%, Betaine 8‑16%, Nonionic Surfactant 5‑18%, AES 5‑18%. The cleaning powder of the present invention can be used for cleaning such as daily hard surfaces (such as tiles, glass, bathroom, stainless steel, kitchen utensils), tableware, clothing, etc., and has high cleaning efficiency; alkyl glycosides are mild active agents and have good biodegradability , no peculiar smell, high activity, no heavy metals, low corrosion, and strong decontamination ability, the washed water can also be decomposed naturally, dredging the sewer, purifying the water source, and beneficial to environmental protection; the cleaning power of the tableware is greater than the existing ones The detergency of kitchen oil stains is greater than 89%, and the detergency of clothes is greater than the decontamination ratio of standard laundry detergent.

The invention discloses a dedusting and purifying device for an underground tunneling working area, and belongs to the technical field of gold mine dedusting. The dedusting and purifying device comprises a bottom plate. A liquid storage tank body, an infusion pump and a support frame body are sequentially arranged on the bottom plate. A case cover body is arranged at the upper end of the support frame body. A movable case body is arranged in the case cover body. A driving assembly and guide assemblies are arranged at the upper end and the lower end of the movable case body respectively. Air filter screens are arranged in the movable case body. One end of the movable case body is connected with an air guide funnel, and the air guide funnel is communicated with an exhaust tube at the input end of a negative-pressure fan which is installed on the inner wall of the top of the case cover body. An exhaust pipe at the output end part of the negative-pressure fan is connected with a machine shell in a secondary dedusting assembly. The dedusting and purifying device for the underground tunneling working area can remove dust from heavy metal dust particles of the whole gold mine, is convenient to maintain, large in dedusting capacity, high in dedusting efficiency, suitable for complex working environments of the gold mine, low in failure rate and easy to maintain, and meets the dedustingrequirement of the gold mine in the actual mining production process.

An Ivc cage automatic water supply device, comprising several Ivc cages and a frame body, the frame body is neatly arranged from top to bottom with several rows of storage cabinets for accommodating Ivc cages, the Ivc cages A drinking bottle is inserted on the top, and a water delivery pipe for transmitting water source is arranged on one side of the frame body. The water delivery pipe extends to each row of the frame body with a water injection pipe. The drinking water bottle includes a water outlet for the experimental animals to suck and a The water inlet end for pouring water, the water injection pipe extends to the water inlet end with a connecting pipe, the connection pipe communicates with the water inlet end to realize the conduction between the drinking water bottle and the water injection pipe, and the water inlet end is provided with a The water bottle is filled with water to automatically block the plugging part of the connecting pipe. The connection between the water injection pipe and the water delivery pipe is provided with a barrier for intermittently blocking the water flow in the water injection pipe. The invention has simple structure, portable operation, and is suitable for most Ivc experiments occasion, it solves the problem in the prior art that the drinking water bottle needs to be frequently disassembled for water replenishment.

The invention belongs to the field of ocean engineering research, and particularly relates to a wave dissipating machine for a submarine landslide model test, which comprises a base, a support rod arranged above the base, a support beam movably connected with the support rod and capable of moving along a direction close to or far away from the base, and a rotating mechanism erected on the support beam; the rotating mechanism comprises at least two synchronous belt wheels, wave dissipating pieces and a servo motor, wherein the axial direction of the synchronous belt wheels is perpendicular to the extending direction of the slope of the wave dissipating machine, the wave dissipating pieces are arranged in the circumferential direction of the synchronous belt wheels at intervals, and the servo motor drives the synchronous belt wheels to rotate through a coupler. The wave dissipation machine is high in practicability and easy to operate, height adjustment and wave dissipation operation of the wave dissipation machine can be achieved only by controlling a motor switch, and the wave dissipation machine can be suitable for a submarine landslide model test device and can be used in indoor model tests of reservoirs, rivers and the like.

The invention relates to a green field effect transistor and a manufacturing method thereof, wherein the green field effect transistor comprises a silicon on insulator, a source electrode, a drain electrode and a channel body, wherein the silicon on insulator comprises a silicon substrate as well as a buried oxide layer and top layer silicon which are sequentially located on the silicon substrate; the source electrode and the drain electrode are located in the top layer silicon and isolated from each other and have different doping types; the cylindrical channel body is located between the source electrode and the drain electrode and sequentially comprises a source connector and a pocket injection layer from a cylindrical core to outside, one end of the channel body is connected to the source electrode, and the other end of the channel body is connected to the drain electrode; the source connector is electrically connected with the source electrode, and the pocket injection layer is electrically connected with the drain electrode; and a grid electrode structure located on the surface of the pocket injection layer of the channel body comprises a grid dielectric layer and a grid electrode on the surface of the grid dielectric layer. The green field effect transistor has the advantages of high response speed and sensitive switching characteristic, satisfies the requirements of a small size scaled-down device on reducing energy consumption and avoids generating a series of second-order effects.

The utility model discloses deformed steel bar rolling equipment, which belongs to the field of rolling equipment and comprises a rolling shell, a rolling mechanism is mounted in the rolling shell, a discharging mechanism is mounted on one side wall of the rolling shell and comprises two fixing plates fixedly connected to one inner wall of the rolling shell, and the two fixing plates are fixedly connected to the other inner wall of the rolling shell. One sides of the two fixing plates are jointly and fixedly connected with a first scraping plate; through cooperative use of all the devices, a steel raw material is inserted into the rolling shell, the steel raw material is rolled through the rolling mechanism, the surfaces of the two rollers are scraped through mutual cooperation of a first scraping plate and a second scraping plate, and therefore the situation that the rollers are affected by oxide scale layers is avoided; and meanwhile, the scraped oxide scale layer falls on the conveying belt, and the conveying belt is driven to move by the rollers, so that the oxide scale layer is discharged by the conveying belt through the discharging groove, and secondary influence of the oxide scale layer on the rolling mechanism is avoided.

The invention discloses a desorption method based on adsorption of calcined bone apatite to heavy metal ions, which comprises the following steps: soaking bone apatite adsorbed with heavy metal ions in a 0.001-0.05 mol / L mixed solution of an ethylenediamine tetraacetic acid aqueous solution and saturated monocalcium phosphate, controlling the pH value of the mixed solution to be 3-5, and carryingout oscillation desorption; and after the oscillation desorption is finished, carrying out ultrasonic cleaning on the bone apatite by using deionized water, and after the ultrasonic cleaning is finished, drying the bone apatite. The concentration of the ethylenediamine tetraacetic acid is 0.001-0.05 mol / L, the ethylenediamine tetraacetic acid is low in concentration and weak in acidity, and afterheavy metal ions are adsorbed on the surface of the bone apatite, the ethylenediamine tetraacetic acid can dissolve functional groups of the hydroxyapatite and compounds formed by the heavy metal ions, so that the product has desorption performance; then heavy metal ions adsorbed in the bone apatite can be effectively washed out through ultrasonic cleaning, the bone apatite has the adsorption capacity again after being dried, and the purpose of cyclic regeneration is achieved.

This invention discloses a beaded membrane bag pressurization and compaction reinforcement device and method for soft soil foundations, relating to the field of building foundation reinforcement. It includes multiple membrane bag units connected sequentially by a chain conveyor. Each membrane bag unit includes at least one sequentially connected membrane bag, and one of the membrane bags in the multiple membrane bag units is connected to a branch pipe. Each branch pipe is equipped with a switch valve, and all branch pipes are connected to a common pressurization conduit. This invention implants the beaded membrane bag pressurization and compaction reinforcement device into the weak soil layer of the soft soil foundation to be reinforced. The surface of the site to be reinforced is then pressurized with grout to inject grout into the membrane bags at the designated depth using a pressurized grouting device. After the grout is injected into the corresponding membrane bags, the membrane bags expand, forming a compression reinforcement on the surrounding soil outside the membrane bags.

The invention discloses a method for making a novel gyroscope signal reading pattern. The micron-level signal reading pattern is obtained by one sputter coating, one photolithography, and one ion beam etching. The process steps are as follows: 1. Sputter on the top plane of the gyro rotor to obtain a metal film; 2. Spin-coat photoresist on the metal film; 3. Perform ultraviolet exposure and development to obtain a photoresist pattern; 4. Use 15° to 30° The incident angle ion beam is etched and the residual photoresist is removed, and the metal signal reading pattern is obtained on the rotor surface.

The invention discloses a kitchen waste deodorant as well as a preparation method and a use method thereof. The deodorant comprises a microbial component and a microbial nutrient component. The deodorant has the effects of inhibiting spoilage bacteria proliferation and adsorbing odor, can release faint scent, treats both symptoms and root causes, can be used for kitchen waste, and solves the problems of odor and mosquito and fly breeding. The deodorant disclosed by the invention is simple in use method, strong in reliability, good in odor elimination universality, safe and green in deodorant material components, harmless to a human body and the environment, free of secondary pollution, and free of influence on further recovery of the kitchen waste when being applied to the kitchen waste; and probiotic microorganisms in the deodorant also help to convert food resources in the feed into a feed for utilization, and better environmental, economic and social benefits are achieved.

The invention provides a preparation method of a Zn-doped alpha-Fe2O3 / graphene aerogel composite catalyst as well as an oxidation system and application of the Zn-doped alpha-Fe2O3 / graphene aerogel composite catalyst. The preparation method comprises the following steps: pretreating graphene to obtain graphene oxide; dispersing the graphene oxide in a certain amount of deionized water to obtain a graphene oxide dispersion liquid; adding a preset amount of FeSO4.7H2O and Zn(Ac)2.2H2O into the graphene oxide dispersion liquid to obtain a precursor solution; putting the precursor solution into a hydrothermal kettle, and conducting reacting at a preset temperature for a preset time to obtain initial gel; and cooling, dialyzing and drying the initial gel to obtain the Zn-doped alpha-Fe2O3 / graphene aerogel composite catalyst. The Zn-doped alpha-Fe2O3 / graphene aerogel composite catalyst is good in catalytic performance and has relatively good visible light response capability.

This invention proposes a method for treating and reusing lead-zinc ore beneficiation wastewater. The method includes pretreatment of the raw ore to obtain a raw ore slurry, followed by a flotation process. The flotation process includes lead flotation of the raw ore slurry and zinc flotation of the lead flotation tailings. The resulting lead concentrate slurry, zinc concentrate slurry, and tailings slurry undergo solid-liquid separation using reagents and a thickener. Wastewater overflowing from the thickener is transported to a mixing tank for collection. The outlet of the mixing tank is connected to the inlet of an adsorption tower group, and the wastewater overflows into the adsorption tower group. After adsorption, the wastewater overflows into a pump tank, where sodium sulfide is added. The wastewater is then pumped to a high-level water tank and finally reused in the flotation process. This method avoids the investment in large-scale water treatment equipment, uses conventional water treatment reagents, is environmentally friendly and economical, requires small amounts, and is widely available, reducing water treatment operating costs and reagent consumption. The process specifically treats wastewater and has broad application prospects for achieving zero discharge of non-ferrous metal beneficiation wastewater.