95results about How to "Reduce secondary pollution" patented technology

This application relates to an air handling device and an air purification device. The air handling device includes a first rotating assembly for connecting to a pre-filter assembly, thereby driving the pre-filter assembly to rotate. A cleaning mechanism is located around the pre-filter assembly. When the pre-filter assembly rotates, the cleaning mechanism acts on the surface of the pre-filter assembly to remove contaminants from its surface. The cleaning mechanism includes a scraper and a roller brush assembly, which are arranged adjacent to each other. Contaminants on the surface of the pre-filter assembly are scraped off by the scraper and carried away by the roller brush assembly. This air handling device not only removes contaminants from the surface of the pre-filter assembly but also carries them away, greatly reducing the possibility of secondary pollution caused by contaminants scraped from the surface of the pre-filter assembly and further improving the purification effect.

The application relates to the field of chemical material preparation, and particularly discloses a high-purity silicon nitride powder and a preparation method thereof. The preparation method of the high-purity silicon nitride powder is as follows: 30-40 parts of silicon dioxide nano particles are mixed with 12-40 parts of carbon black to obtain a blend by adding deionized water, the blend is stirred, and the blend is dried at 60-65 DEG C to obtain a silicon-carbon precursor; nitrogen is introduced into the carbon-silicon precursor, the temperature is increased to 1350-1500 DEG C, and the temperature is kept constant to obtain a crude product; ammonia is continuously introduced into the crude product, the temperature is kept constant at 1300-1400 DEG C to obtain a first purification product; the first purification product is cooled to 600-650 DEG C, oxygen is introduced, and the temperature is kept constant to obtain a second purification product; and the second purification product is cooled to obtain the product. The preparation method of the high-purity silicon nitride powder can prepare high-purity silicon nitride powder with a purity of 99.65% or above.

The utility model relates to the technical field of municipal engineering and robot technology intersection, especially a kind of self-propelled dredging robot of municipal sewer pipeline inner wall.The utility model provides a kind of self-propelled dredging robot of municipal sewer pipeline inner wall, including frame, track module and electric telescopic rod etc., two track modules are slidably installed in the left and right sides of frame, track module is all arranged obliquely, two electric telescopic rods are installed in the left and right sides of frame, and the telescopic end of electric telescopic rod is connected with the track module that is close to each other.The utility model provides walking power source by track module, significantly enhances the passing capacity of equipment whole, so that it can adapt to a variety of complex terrain environment in pipeline, simultaneously, under the assistance of supporting wheel and electric push rod, ensure that track is always close to inner wall, improve grip, and then effectively improve the operating stability and operation reliability of equipment.

The present application relates to the technical field of coke oven gas purification, and discloses a microcrystalline material adsorption equipment for coke oven gas purification, which comprises a feeder, a first rectifying tower, a second rectifying tower and a third rectifying tower connected in sequence; a pressurizing machine is used for pressurizing or cooling the coke oven gas during the adsorption process, which is beneficial to the adsorption of adsorbate on the adsorbent; a heater is used for heating the coke oven gas during the adsorption process, which is beneficial to the regeneration of the adsorbent and the process of adsorption separation cycle; the first rectifying tower is used for primary adsorption and fine removal, and active carbon spherical adsorbents are arranged in the first rectifying tower; the second rectifying tower is used for secondary adsorption and fine removal, and iron oxide adsorbents are arranged in the first rectifying tower; the third rectifying tower is used for tertiary adsorption and fine removal, and hydrophobic microcrystalline material adsorbents are arranged in the third rectifying tower. The present application has the advantages of adopting multiple adsorption components to cooperate with graded adsorption, and adopting heating adsorption and pressure swing adsorption to improve the adsorption and regeneration effect on coke oven gas.

The utility model discloses a kind of hydraulic cavitation reinforced cement sand cyclone separation devices, including hydraulic cavitation pipe, feed assembly and cyclone separation component;One end of the hydraulic cavitation pipe is connected with the feed assembly, and the other end is connected with the cyclone separation component. The feed assembly includes silt mixed liquid inlet pipe, the silt mixed liquid inlet pipe is connected with the hydraulic cavitation pipe, and inlet valve is connected on the silt mixed liquid inlet pipe. The feed assembly further includes air compressor, and the air compressor output end is connected with the hydraulic cavitation pipe by first pipeline. The cyclone separation component includes cyclone separator, the inlet of the cyclone separator is connected with the hydraulic cavitation pipe by second pipeline, and the lower end of the cyclone separator is connected with sludge discharge valve, and the utility model aims at overcoming the defects of the prior art to provide a kind of hydraulic cavitation reinforced cement sand cyclone separation device, improve the recycling rate of sand particle.

The utility model relates to chemical engineering technical field, concretely is a kind of separation device of liquid phase ammonia-containing mixed product, including separation tank, filter box, filter screen, mobile device and filter screen cleaning device, the top of separation tank is installed with connecting pipe, the outer wall of connecting pipe is installed with pump body, the top of connecting pipe is installed with the filter box, the top of filter box is installed with liquid inlet pipe, the inside of filter box is installed with the filter screen, the lateral wall of filter box is installed with collection cover by the mobile device, pass through mobile device and drive collection cover synchronous movement, realize the cleaning of each orientation of filter screen, adopt "filter screen+nanofiltration membrane" two-stage separation mechanism, first rough then fine, improve overall separation efficiency, filter screen cleaning device and mobile collection cover work cooperatively, realize on-line automatic cleaning, the design of filter screen cleaning device makes filter screen can keep clean state, improve the reliability of overall equipment.

The utility model provides a combustion nozzle for mixing various waste gases, and belongs to the field of industrial waste gas emission. And the problem of insufficient combustion caused by non-uniform mixing of various waste gases is solved. The multi-hole nozzle comprises a nozzle shell, a multi-hole outer pipe, a multi-hole inner pipe, a fan blade pipe, a vacuum generator and a combustion air gun. An air inlet is formed in the side wall of the nozzle shell; a porous outer pipe and a porous inner pipe are arranged in the nozzle shell, the porous outer pipe is arranged on the outer side of the porous inner pipe, and the top of the porous outer pipe and the top of the porous inner pipe are both connected with the shell cover plate; a spraying opening is formed in the bottom of the nozzle shell; the nozzle shell is connected with a furnace end through a spraying opening, and a negative pressure chamber and a waste gas mixing chamber are sequentially arranged in the furnace end in the gas circulation direction. An air gun connector is arranged outside the furnace end; a fan blade pipe is arranged on the outer side of the porous inner pipe, and a plurality of inclined partition plates are arranged in the fan blade pipe in the circumferential direction at equal intervals. The waste gas mixing device is mainly used for fully mixing various waste gases.

The invention relates to a cleaning agent used after SiC substrate grinding and a preparation method thereof, and relates to the field of semiconductor cleaning agents, and the cleaning agent is prepared from the following raw materials by mass: 4-8% of an anionic surfactant, 2-6% of a nonionic surfactant, 2-6% of a cleaning auxiliary agent, 8-12% of sodium hydroxide, 2-4% of a bio-based modified antistatic agent, and the balance of water. The preparation method comprises the following steps: heating water, adding sodium hydroxide, stirring, adding the cleaning aid, stirring, adding the premixed anionic surfactant and nonionic surfactant, stirring, adding the bio-based modified antistatic agent, stirring, cooling, and filtering to obtain the cleaning agent for grinding the SiC substrate. The cleaning agent has a good cleaning effect, can effectively remove impurities after grinding, and meets the requirement of the semiconductor industry for high-quality cleaning of SiC wafers.

This invention discloses a high-efficiency separation device and method for oily sludge. The device includes a shell, within which, from top to bottom, are sequentially arranged interconnected strong mixing and dispersion unit, thermal vibration polymerization unit, and three-phase separation unit, respectively used for primary demulsification of strong mixing and dispersion, secondary demulsification of thermal vibration polymerization, and three-phase separation of oily sludge. By integrating the strong mixing and dispersion unit, thermal vibration polymerization unit, and three-phase separation unit into a single device, this invention efficiently solves the technical problem of difficult efficient separation of oily sludge in the prior art. It features small footprint, compact design, low maintenance cost, stable and reliable operation, strong adaptability, low secondary pollution, and high separation efficiency.

The invention relates to the technical field of ceramic part cleaning, in particular to a cleaning device and method for high-cleanliness ceramic parts, the cleaning device comprises a cleaning box and a sealing cover hinged to the cleaning box, and a semi-enclosed electric heating wire is arranged on the side, away from a control panel, in the cleaning box; the cleaning assembly is arranged on the rotating frame, and the cleaning assembly comprises a first cleaning cavity and a second cleaning cavity which are located on the rotating frame; and the switching assembly is arranged below the rotating frame, and the switching assembly comprises a driving module and a placing module. Compared with the prior art, the placement module is forced to form a stable inclination angle when moving to the warping plate, and in cooperation with inclined jet flow of the second water outlet nozzle, cleaning liquid sweeps the arc-shaped outer surface and the side wall / transition fillet area at a more appropriate incidence angle; meanwhile, the inclined posture is beneficial to rapid discharge of a liquid film, and the common accumulated liquid, water pocket and water mark residual risks caused by horizontal placement are reduced.

The invention discloses a method for recovering valuable elements in liquid obtained after bauxite wet desulphurization, and relates to the technical field of bauxite resource utilization. Comprising the following steps: carrying out ceramic membrane filtration pretreatment on the bauxite wet desulfurization liquid to remove impurities; the silicon element is recycled in a targeted manner through a compound flocculation-calcination process to obtain the white carbon black; the iron element is recycled through ozone oxidation-ammonium bicarbonate precipitation, and high-purity iron oxide is prepared; separating and purifying an aluminum element through a seed crystal induction-calcination process to obtain metallurgical-grade aluminum oxide; a fluorine-containing precipitant is used for selectively precipitating and recovering magnesium element to obtain a high-quality magnesium salt product; and neutralizing the tail liquid, and discharging after reaching the standard. According to the method, accurate separation and high-valued utilization of four elements of aluminum, iron, silicon and magnesium are realized through a synergistic process of targeted recovery of silicon, gradient separation of iron and aluminum and selective precipitation of magnesium, and the problems of silicon resource waste, low element separation efficiency, insufficient product purity, secondary pollution and the like in a traditional process are thoroughly solved; all-component resource comprehensive utilization of desulfurized liquid resources is achieved.

This invention discloses a method for the biological drying of sludge, comprising the following steps: baking biomass materials, mixing the resulting baked product with sludge, biochar materials, and a conditioner for biological drying, thereby completing the sludge drying process. In this invention, by biologically drying the mixture of baked product, sludge, biochar materials, and conditioner, not only can the self-generated heat within the system be used to effectively dewater the sludge in a very short time, but the bioavailability of the microbial carbon source can also be improved, effectively reducing the generation of polluting gases. This method can effectively reduce the emission of polluting gases while achieving rapid dewatering. It has advantages such as simple process, low treatment cost, low energy consumption, high drying efficiency, good dewatering effect, low polluting gas production, and low content of toxic and harmful components in the dried product. It can solve the problems of biomass resource waste and pollution, achieve sludge reduction and resource utilization, and has high returns and good application prospects.

The application provides a raw material water tank pressure balance and foul gas treatment coupling system and method, and relates to the technical field of petroleum chemical industry.The system comprises a raw material water tank, a pressure detection and control system, a steam jet unit, and a foul gas treatment unit.The pressure detection and control system comprises a pressure transmitter arranged on the top of the raw material water tank.The steam jet unit comprises a steam jet and a steam pipeline.The suction inlet of the steam jet is connected with the gas phase space of the raw material water tank through the pipeline, and the power inlet of the steam jet is connected with the steam pipeline.The gas inlet of the foul gas treatment unit is connected with the outlet of the steam jet.The pressure transmitter is connected with the steam jet unit, and is used for starting the steam jet when detecting that the tank top pressure of the raw material water tank is higher than the set upper limit value, so as to suck, pressurize and seal the gas in the raw material water tank and transport the gas to the foul gas treatment unit.The method comprises pressure intelligent balance, gas directional transfer and foul gas cooperative purification, and is used for realizing clean and standard emission of tail gas.

The application discloses a kit based on gravity-driven liquid flow, comprising a box body, a liquid storage area and a reaction area arranged from top to bottom in the box body, the liquid storage area comprising a liquid flow channel and a plurality of liquid storage rods arranged on the liquid flow channel, the liquid storage rods storing liquid, the liquid storage rods being provided with liquid flow holes, the liquid storage rods being capable of sliding on the liquid storage area so that the liquid flow holes are communicated with the liquid flow channel, the reaction area comprising a reaction chamber, the reaction chamber being communicated with the liquid flow channel, when the liquid flow holes are communicated with the liquid flow channel, the liquid can flow into the reaction chamber under the action of gravity, the lower end of the reaction area being provided with a waste liquid area and an amplification area, the reaction area being provided with an isolation column at a connecting end of the waste liquid area and the amplification area, the isolation column being provided with a communication hole, the isolation column being capable of sliding on the reaction area so that the communication hole communicates the reaction area with the waste liquid area or the amplification area, so that the liquid in the reaction area flows to the waste liquid area or the amplification area under the action of gravity.

The application discloses a side brush mechanism and a cleaning device. The side brush mechanism comprises a gear box assembly and a cleaning assembly. The gear box assembly comprises a gear box shell and a rotating driving part connected with the gear box shell. An end of the gear box shell away from the rotating driving part is provided with an abutting part. The cleaning assembly comprises a cleaning shell, a floating part, an elastic part and a bristle part. The rotating driving part drives the cleaning shell to ascend or descend. The abutting part is abuttable against the floating part in a releasable mode. The elastic part is arranged on the cleaning shell. One end of the bristle part is abuttable against the floating part and the elastic part. The other end of the bristle part penetrates through the cleaning shell and extends out of the cleaning shell. In the side brush mechanism, the floating part acts on one end of the bristle part and makes the bristle part rotate during the ascending process of the cleaning assembly. The other end of the bristle part can be completely separated from the surface to be cleaned. Thus, the secondary pollution of the cleaning assembly to the surface to be cleaned is reduced, and the cleaning efficiency is improved.

This utility model discloses a wear-resistant slider processing device, specifically relating to the field of slider processing technology. It includes an operating table, a back plate fixedly connected to the upper rear side of the operating table, a top plate fixedly connected to the upper end of the back plate, a motor fixedly connected to the middle of the upper end of the operating table, and a turntable fixedly connected to the output end of the motor. The motor drives the turntable to rotate. A processing table is fixedly connected to the outer side of the turntable. Fixing mechanisms are symmetrically arranged on both sides of the upper end of the processing table, used to fix the slider during processing. This utility model achieves slider positioning by setting up a processing table in conjunction with fixing mechanisms. After drilling, the processing table switches positions, using magnetic suction columns to clean debris from the holes. A drive mechanism drives a scraper to rotate and clean debris, while a second scraper manually cleans debris from the bottom of the magnetic suction columns. This solves the problem that traditional negative pressure dust collection cannot remove debris from holes, reduces splashing and secondary pollution during processing, and not only improves production efficiency but also efficiently recovers debris.

The utility model is suitable for silicon carbide membrane filtration technical field provides a kind of agentless self-flocculation silicon carbide membrane filtration device, it include: fixed seat, the fixed seat is equipped with reaction mechanism and water production tank;The reaction mechanism includes the reaction pool of being fixed on the fixed seat, the one side of the reaction pool is equipped with ladder, one end of the reaction pool is equipped with power supply, the power supply is connected and is equipped with electrode, the one side of the reaction pool is equipped with control electric box, the inside of the reaction pool is equipped with membrane box group, the outside of the reaction pool adjacent the membrane box group is equipped with driving assembly, the top of the reaction pool is equipped with mud scraping assembly, the bottom of the reaction pool is equipped with a plurality of groups of first discharge pipeline, by this, the utility model has the advantages that reagent dosage is less, sludge production is low;High degree of automation, convenient operation;Equipment integration degree is high, and floor area is small;Processing effect is more optimal, and special water quality is suitable;Environment-friendly strong advantage.

The utility model relates to the technical field of waste water crystallization treatment, and discloses a waste water heating, crystallizing and separating treatment device which comprises a crystallizing tank, a scraper blade is connected in the crystallizing tank through a rotating assembly, an electric heating tube is fixedly connected to the inner wall of the crystallizing tank, and an electromagnetic valve is fixedly connected to the lower side of the right end of the crystallizing tank. A first support is fixedly connected to the outer surface of the lower end of the crystallizing tank, a connecting pipe is fixedly connected to the outer surface of the top end of the crystallizing tank, a filter box is fixedly connected to the upper end of the connecting pipe, a box door is slidably connected to the right end of the filter box, and a filter plate is connected to the inner wall of the filter box through a linkage assembly. The top end of the filter box is fixedly connected with a water inlet pipe. According to the device, floating objects are intercepted through the filter plate, the hydraulic rod pushes the extrusion plate to clean and extrude the floating objects, blockage is prevented, and secondary pollution is reduced; the spiral scraper scrapes crystals on the inner wall of the crystallizing tank and conveys and collects the crystals, so that the process is simplified and the cleaning trouble is avoided.

The application discloses an industrial waste gas environment-friendly treatment equipment, and relates to the technical field of industrial waste gas treatment.The equipment comprises a treatment cylinder, a waste gas treatment unit and an air inlet tank.The waste gas treatment unit is arranged in the treatment cylinder and is used for filtering, purifying and discharging waste gas and comprises a motor, a connecting rod, an air pipe, a partition plate, a fixed plate, a filter cylinder assembly, a spraying assembly and a transmission assembly.The filter cylinder assembly comprises a filter inner cylinder, a filter middle cylinder and a filter outer cylinder which are coaxially sleeved from inside to outside and are used for three-stage step-by-step filtering of waste gas and accurate spraying treatment of high-concentration waste gas through the spraying assembly.The equipment can realize flexible and stable treatment of high-concentration waste gas through step-by-step gradient filtering, can prevent blockage through reverse rotation shear flow field to adapt to different working conditions, can keep the channel unblocked through double-layer cleaning and collection of filter residues, can reduce consumption through self-adaptive spraying adjustment of the amount of medicine, can eliminate secondary pollution and protect the adsorption performance of activated carbon through manganese-based catalytic decomposition of ozone.

This invention relates to the field of laser cutting technology, specifically a laser processing device for the production of disconnect switches. The device includes a main body with a sliding arm slidably connected to it. A transverse drive is slidably connected to the sliding arm, and a laser cutting head is mounted on the transverse drive. A follow-up pretreatment mechanism is fixedly connected to the sliding arm. The follow-up pretreatment mechanism includes a second double-headed telescopic rod fixedly connected to both sides of the sliding arm. An upper plate and a lower plate are fixedly connected to the upper and lower sides of the second double-headed telescopic rod, respectively. This device uses multiple telescopic rods to move the adsorption box, achieving sealing of the adsorption box and opening of the suction box. Simultaneously, it uses a wedge, rack, and gear linkage to switch the clean section of the dustproof cloth strip, automatically cleaning the protective mirror through negative pressure suction and wiping with the clean cloth strip. Compared to manual cleaning of the protective mirror, this cleaning method is more convenient and efficient, improving the overall cutting efficiency of the equipment.

This invention discloses a sludge treatment device for urban drainage pipe networks, comprising a sludge treatment device body installed on one side of a sludge accumulation tank in the drainage pipe network. The sludge treatment device body includes a water tank, located on the upper right side of the sludge accumulation tank. This invention, through a series of structural features, facilitates simultaneous rotary centrifugal rapid filtration of sewage at two locations, and the centralized discharge of sludge and solid waste. This achieves efficient and stable solid-liquid separation and diversion, allowing for convenient transportation using ordinary vehicles directly at the discharge point. It also effectively reduces secondary pollution caused by excessive leakage during transport, improving ease of use and environmental friendliness. Furthermore, it allows for automatic, periodic backflushing and cleaning of the filter elements on both sides during continuous operation, ensuring stable and unobstructed operation and thus guaranteeing effective treatment. After cleaning, it automatically switches to simultaneous rapid filtration and sludge discharge from both sides, achieving high efficiency and improving work efficiency.

The application provides a method for monitoring a contaminated soil remediation process, which comprises the following steps: adding micro-nano reactors into wet contaminated soil, transferring into a closed container, mixing uniformly, carrying out the soil remediation process, collecting samples at different time periods of the remediation process, separating the micro-nano reactors from the soil by using a flotation method or a screening method, and obtaining the micro-nano reactors with target pollutants or degradation products of the target pollutants on the surfaces of the micro-nano reactors. The surface state of the separated micro-nano reactors and the target pollutants or degradation products are analyzed by using spectroscopy technology, the distribution of the target pollutants, the element valence, the morphology of the nano metal or metal oxide, the crystal form and the change of the valence are judged, the separated micro-nano reactors are washed by using an organic solvent, the target pollutants or degradation products washed out are analyzed, and the types of the target pollutants or degradation products are judged; and the progress of the soil remediation and the interaction mode of the components in the micro-nano reactors and the pollutants in the soil are obtained according to the analysis results.

The invention discloses a working face dust removal, spraying and fresh air system for a coal mine, and belongs to the technical field of coal mine underground environment governance and occupational health safety. The system comprises a track hoisting and moving device, a wet-type vortex dust removal fan, a spraying and dust falling device, a fresh air device and an automatic control system. The structural frame is hung on the moving trolley through the hanging chain and is driven by the driving main machine to move dynamically along the track. The dust removal fan adopts the combination of a radial mixing type impeller and a dewatering vortex wheel, so that powerful dust collection and dry and comfortable exhaust are realized; the spraying device realizes intelligent avoiding and spraying stopping through a personnel proximity sensor; the fresh air device is of a double-channel structure, and positive-pressure clean fresh air is provided for the breathing area through four-stage deep purification. The problems that traditional equipment is installed and fixed, functions are split, people are prone to getting wet, and breathing guarantee is lacked are solved, integrated cooperation of full-working-face dynamic cruise control, precise dust suppression and medical-grade fresh air supply is achieved, and the safety and comfort of underground operation are remarkably improved.

The present application relates to the technical field of CO2 capture and utilization, and particularly relates to an electrolytic cell device and method coupling carbon capture liquid regeneration and CO2 utilization. The device comprises an electrolytic cell cathode chamber, an electrolytic cell anode chamber, a carbon dioxide desorption chamber and a power supply. The method steps are as follows: step one: adding carbon capture absorption liquid after absorbing carbon dioxide into the carbon dioxide desorption chamber, adding electrolyte I into the electrolytic cell cathode chamber, and adding electrolyte II into the electrolytic cell anode chamber; step two: introducing carbon dioxide into the electrolytic cell cathode chamber; step three: connecting the power supply, and performing carbon capture absorption liquid electrolysis treatment and carbon dioxide electrochemical reduction. The present application couples carbon capture absorption liquid electrochemical regeneration technology and carbon dioxide electrochemical reduction technology, has the advantages of low energy consumption and less secondary pollution, and can simultaneously realize low-cost regeneration of carbon capture absorption liquid and green and efficient utilization of carbon dioxide.

The invention discloses a nickel-containing wastewater treatment method which comprises the following steps: adding a pH regulator into nickel-containing wastewater, stirring, and precipitating impurity metal ions to obtain a first mud-water mixture; performing mud-water separation on the mud-water mixture to form nickel-containing filtrate and first impurity sludge; adding a pH regulator into the nickel-containing filtrate, regulating the pH value to be greater than 10, and stirring to form nickel hydroxide precipitate, so as to obtain a second mud-water mixture; performing mud-water separation on the second mud-water mixture to form clear water and second impurity sludge; adding a 30% sulfuric acid solution into the second impurity sludge, and stirring to form a nickel sulfate electrolyte; the nickel sulfate electrolyte is subjected to electrolytic deposition to form a nickel simple substance, and a boric acid buffer agent and a sodium hydroxide solvent are supplemented to adjust the PH value to be 2.8-3.5; and the nickel elementary substance is recycled. According to the method, high-purity nickel elementary substances can be separated out, secondary processing is not needed, and the purity requirement of finished nickel is met; the dosage of the agent is small, and secondary pollution is reduced.

The application discloses a kind of extraction detection methods of multiple organic pollutants in soil, which comprises the following steps: weighing soil sample is filled in extraction pool, and carries out fast solvent extraction process, and extraction liquid is collected in collection bottle;Extraction liquid is concentrated on rotary evaporator under reduced pressure, and is washed and purified in chromatographic column, and after all the eluate is collected in flat-bottomed flask, it is concentrated under reduced pressure on rotary evaporator;Part of the concentrated liquid is centrifuged, then nitrogen is blown, and after blowing dry, constant volume is added to methanol phase, and internal standard indicator is added, and UPLC-MS is used for detection;Part of the concentrated liquid is nitrogen blown, and after blowing dry, constant volume is added to ethyl acetate phase, and internal standard indicator is added, and GC-MS / MS is used for detection;The standard curve of target compound is quantitatively analyzed by internal standard method.The application has good matrix applicability, method universality and analysis flux, and can provide reliable technical support for comprehensive and accurate evaluation of soil complex pollution and ecological environment risk.

A deep purification system for light hydrocarbons adapted to low-pressure conditions includes a pretreatment unit, a primary adsorption tower, an intermediate conditioning unit, a secondary adsorption tower, and a tertiary adsorption tower connected in series. The primary, secondary, and tertiary adsorption towers are filled with modified COFs adsorbents, and each tower is equipped with a regeneration unit. The regeneration unit achieves desorption of the modified COFs adsorbent and recovery of light hydrocarbon gases through steam desorption, nitrogen purging, and cryogenic cooling. This invention solves the problems of low capacity, poor mass transfer at low pressure, and insufficient stability in existing adsorption technologies.

This utility model relates to a thread grinding machine, including a base, a chuck and a tailstock for clamping workpieces, and a horizontally movable wheel frame. A grinding wheel spindle and a drive motor are mounted on the wheel frame. A material discharge hole is formed on the upper surface of the base between the chuck and the tailstock. A funnel-shaped material collection bin with openings at both the top and bottom is installed at the bottom of the material discharge hole. A cleaning brush adapted to the inner wall of the material collection bin is installed inside the bin. The cleaning brush is connected to the base via a horizontal slide, and one end of the cleaning brush is connected to the wheel frame. The cleaning brush moves synchronously with the wheel frame, cleaning debris adhering to the inner wall of the material collection bin. This utility model, by providing a material discharge hole on the base and installing a funnel-shaped material collection bin, utilizes the horizontal movement of the wheel frame to drive the synchronous movement of the cleaning brush, achieving periodic cleaning of the inner wall of the material collection bin, effectively avoiding equipment failure and reduced machining accuracy caused by debris accumulation.

The invention relates to the technical field of PCB (Printed Circuit Board) processing, in particular to a PCB processing device which comprises a rack, and a conveying line is arranged on the rack; a feeding device, a dust removal device, a dry film pressing device, an airing and turning device and a discharging device are sequentially arranged on the machine frame in the conveying direction of the conveying line, the discharging device comprises a driver and an L-shaped frame, the two sides of one end of the L-shaped frame can be rotationally installed on the machine frame, and the driver is installed on the machine frame and is in transmission connection with the rotating center of the L-shaped frame; the driver can drive the swinging end of the L-shaped frame to swing to be horizontal and to be lapped on the discharging end of the conveying line, the back face of the L-shaped frame in the horizontal state can bear a PCB, a limiting hook block is arranged at the end, away from the discharging end of the conveying line, of the back face of the L-shaped frame, and the limiting hook block can contain and limit the corresponding side edge of the PCB; a plate bearing mechanism is slidably arranged on the rack and located in front of discharging of the conveying line. According to the automatic dry film pressing line for the PCB, the blanking stability can be improved, and the film pressing quality and the production efficiency are ensured.