34 results about "Toxic waste" patented technology

The present application relates to coke oven gas purification desulfurization and dehydrocyanation technical field, especially to a kind of closed molten sulfur collection system and process.It includes multiple molten sulfur kettles (1) connected in parallel by pipeline, also includes multiple buffer tanks (3), multiple inclined pipes (7) and a sulfur receiving disc (10);Each molten sulfur kettle (1) is connected with respective buffer tank (3) by pipeline, buffer tank (3) is connected with one end of inclined pipe (7) by pipeline;The other end of multiple inclined pipes (7) is merged into a main pipe, and the main pipe is connected with the sulfur receiving disc (10).Sulfur collection after molten sulfur kettle is completely closed, effectively avoid toxic waste gas, sulfur dust and molten sulfur splashing to bring harm to workers;At the same time, sulfur collection process can realize unmanned operation on site, save labor cost.

The invention discloses a waste gas recovery and treatment combined device for traditional Chinese medicine forging and a control method of the waste gas recovery and treatment combined device, and belongs to the technical field of traditional Chinese medicine forging. An observation window for observation is fixedly mounted on a door plate of the calcining furnace; a door plate of the calcining furnace is fixedly connected with a visual detection assembly for observing the color of gas in the calcining furnace; the top of the calcining furnace is fixedly connected with a thermocouple for temperature monitoring; the top of the calcining furnace is connected with an adjustable gas outlet assembly for controlling gas discharge; the adjustable gas outlet assembly is respectively connected with a fifth gas outlet pipe for directly discharging gas, a sulfur recovery assembly for recovering sulfur and an adsorption assembly for adsorbing sulfur dioxide, and the gas outlet ends of the sulfur recovery assembly and the adsorption assembly are fixedly connected with the fifth gas outlet pipe. According to the invention, recovery and treatment of toxic waste gas are realized, and harm of toxic waste gas to human body and nature is reduced to a great extent.

The present application relates to the technical field of fine chemical product synthesis, and in particular to a synthesis method of 3-chloropropynyl co-production of p-chlorobenzaldehyde, which comprises the following steps: mixing propargyl alcohol, a solvent, an ionic liquid catalyst, a cocatalyst DMF and a polymerization inhibitor p-tert-butyl catechol, heating and slowly adding p-chlorobenzylidene dichloride dropwise into the mixture, collecting the generated 3-chloropropynyl crude product at the tail gas outlet, cooling after the reaction is completed, and sequentially reducing pressure rectification of 3-chloropropynyl, the remaining propargyl alcohol and the solvent, and p-chlorobenzaldehyde product through a rectification tower. The present application solves the problems of using toxic and hazardous chemicals chlorinating agent in the production of existing 3-chloropropynyl, and generating a large amount of toxic waste acid gas or low-value byproducts, and the problem of low utilization rate of chlorine atom in the existing direct hydrolysis method of p-chlorobenzaldehyde, and reduces environmental pollution.

The invention relates to the technical field of waste gas recovery treatment equipment, and discloses urea-formaldehyde resin curing agent synthesis waste gas recovery equipment which comprises a treatment tank body, a smearing assembly is fixedly mounted in the middle of an inner cavity of the treatment tank body, and the smearing assembly comprises an outer frame with the bottom movably sleeved with a grid assembly; and a driving motor is fixedly installed in the middle of the inner cavity of the outer frame, the bottom of the outer surface of the driving motor is fixedly sleeved with an inner spraying piece, and the inner spraying piece comprises a smearing plate with the bottom end making contact with the top end of the grid assembly. According to the urea resin curing agent synthesis waste gas recovery equipment, a smearing assembly and a structure on the smearing assembly are arranged, under the surface tension effect of liquid, chemical agents can be reserved in meshes in a grid assembly, when toxic waste gas penetrates through the grid assembly from bottom to top, the toxic waste gas can make contact with and react with the chemical agents reserved in the meshes, and therefore the toxic waste gas can be recycled. Compared with chemical agent spraying, the mode has the advantage that the effective utilization rate of chemical agents is high.

The invention discloses a method for detecting lead plaster components of a waste lead-acid storage battery. The invention relates to the technical field of waste storage battery resourceful treatment and detection, the method comprises preparation and calibration of an EDTA standard solution, and continuous determination of the content of lead oxide, lead sulfate, metal lead and lead dioxide in lead plaster, through use of formic acid, ammonium carbonate and other reagents and combination of an ultrasonic-assisted extraction technology, the dissolution efficiency is significantly improved, and the content of lead oxide, lead sulfate, metal lead and lead dioxide in the lead plaster is determined. The reaction time is greatly shortened; the selective dissolution of the metal lead is realized by accurately controlling the low-temperature condition and the reaction time, and the interference of lead dioxide is effectively avoided; according to the method, by optimizing a reagent system and introducing ultrasonic-assisted extraction, the dosage of strong acid and the emission of toxic wastes are greatly reduced, the method is more environment-friendly while the result accuracy is ensured, and the method is clear in operation flow, good in reproducibility and suitable for rapid and reliable determination of the components of the lead paste in an industrial recovery scene.

The invention discloses a fusion magnet recovery cable surface continuous chromium removal system and method, and relates to the technical field of superconducting material surface treatment.The fusion magnet recovery cable surface continuous chromium removal system comprises a polishing module which comprises a rough polishing brush and a fine polishing brush; the positioning tool module is used for overturning and lifting the superconducting cable base body; the intelligent control unit is used for parameter setting and process control; the ultrasonic cleaning device is used for removing residual abrasive dust and surface pollutants after polishing; a nitrogen protection system; provided is a thickness gauge. Efficient chromium removal is achieved through the double-stage polishing process, the chromium removal rate is increased, the plied yarn scratch depth is reduced, meanwhile, mechanical chromium removal is adopted to replace a chemical method, environment friendliness is achieved, no toxic waste liquid is discharged, meanwhile, an intelligent control unit is integrated, accurate control over process parameters and automatic abrasion compensation are achieved, and the method is suitable for various superconducting cable types and has wide application prospects. The system is particularly suitable for preparing a superconducting cable connector terminal of a nuclear fusion device, and is convenient to maintain and remarkable in economic benefit due to modular design of equipment.

The present application relates to the technical fields of coated sand core making, in particular to a sand shooting machine for forklift accessory mold forming, comprising a sand shooting machine body, sand shooting heads, and a feeding table, wherein the sand shooting machine body is provided with the feeding table and a plurality of sand shooting heads, the sand shooting heads are provided with sand shooting nozzles, the feeding table can move in the vertical direction, the feeding table is provided with an upper mold at the bottom end, the sand shooting machine body is provided with a lower mold, the upper mold and the lower mold are matched to form a mold for forming coated sand, the sand shooting heads and the sand shooting nozzles are matched to spray coated sand into the mold, and the sand shooting heads and the feeding table are provided with a waste gas removal device. When the coated sand in the mold is heated to produce toxic waste gas during the working process of the sand shooting machine, the waste gas removal device can automatically remove the toxic waste gas.

The utility model relates to gas purification equipment technical field especially relates to a waste gas filter tank and gas washing equipment, and the device contains: fixedly arranged on the air inlet pipe of jar body, the air outlet end of air inlet pipe communicates with the inner chamber top of jar body for transmission toxic waste gas, the air outlet pipe is fixedly arranged on jar body, and the air inlet end of air outlet pipe communicates with the inner chamber top of jar body, the water supply pipe is fixedly arranged on jar body, and the output end of water supply pipe communicates with the inner chamber of jar body for transmission cooling water to the inner chamber of jar body, the shunt pipe is arranged in the air outlet end of air inlet pipe for the shunting of toxic waste gas that air inlet pipe output has carried out. The utility model discloses by adopting shunt pipe and shunt formation multiple small air current with toxic waste gas, to increase the contact area of toxic waste gas and cooling water, and then enhance the heat exchange efficiency of cooling water to toxic waste gas and the capture effect of solid phase particulate impurities, solved the low problem of cooling efficiency in the prior art.

The invention discloses environment-friendly silicon carbide seed crystal treatment equipment which comprises a driving motor, a driving cylinder, a water storage tank, a top plate and a bottom plate, wherein a first belt pulley is mounted at the output end of the driving motor; the driving cylinder is mounted on a U-shaped frame; the water storage tank is mounted on a base; a protective cover is installed at the upper end of the top plate in a sealed mode, an output shaft of the driving motor is rotationally connected with the protective cover through a third sealed bearing, and the output end of the driving cylinder is connected with the protective cover. A plurality of groups of splines are rotationally arranged on the top plate through first sealing bearings, the splines are spirally arranged, a second belt pulley is mounted at the upper end of each spline, and the first belt pulley and the second belt pulley are connected through a toothed belt; and a movable pipe is arranged on each spline in a sliding manner. According to the equipment, seed crystals are immersed in deionized water for micropore treatment so as to realize rough treatment on the surfaces of the seed crystals, the operation is convenient and simple, the safety is high, toxic waste liquid is not generated, and the equipment is environment-friendly.

The utility model relates to the technical field of gas purification equipment, in particular to waste gas treatment equipment which comprises a collecting tank, a first partition plate and a gas guide hole, a first water solution is pre-stored in the collecting tank; the first partition plate is fixedly arranged on the top wall of an inner cavity of the collecting tank in the height direction of the collecting tank and divides the inner cavity of the collecting tank into a first collecting chamber and a second collecting chamber, the top of the inner cavity of the first collecting chamber is communicated with the air inlet end of the collecting tank, and the upper portion of the inner cavity of the second collecting chamber is communicated with the air outlet end of the collecting tank. The air guide hole is formed in the first partition plate, located in the bottom of the inner cavity of the collecting tank and communicated with the first collecting chamber and the second collecting chamber. According to the utility model, the first partition plate provided with the gas guide hole is arranged in the first collection chamber of the collection tank, and particulate matters mixed in waste gas can be effectively captured by utilizing the first aqueous solution stored in the collection tank, so that the defect of poor capturing effect on powder mixed in toxic waste gas in the prior art is overcome.

The utility model discloses magnetic density separation equipment for classifying electronic waste particles, which relates to the technical field of electronic waste treatment and comprises a bottom plate, and four supporting legs and two supporting plates are fixedly connected to the upper surface of the bottom plate. Superconducting magnets fixed to the supporting legs at the corresponding positions and a plurality of rotating rods rotationally connected with the supporting plates at the corresponding positions are arranged above the bottom plate. According to the device, various metals mixed in electronic wastes can be effectively separated at the same time through the paramagnetism of the magnetic fluid and the density difference of different metals, compared with other traditional schemes, the process steps are greatly shortened, and compared with a traditional method depending on chemical reagents or high-temperature smelting, physical separation does not need to use strong acid, cyanide or high temperature, and the cost is reduced. Separation is achieved only through physical fields such as a magnetic field and water flow, so that emission of toxic waste water and waste gas is remarkably reduced, the environmental protection treatment cost of enterprises is reduced, and meanwhile workers are prevented from making direct contact with heavy metal and harmful chemical substances.

The invention relates to the technical field of animal brain tissue sampling, in particular to a low-temperature perfusion device which is characterized in that a recycling groove is formed in the edge of an operation plate, the bottom face of the recycling groove is hollowed out, a binding plate and two stacked low-temperature perfusion assemblies are arranged above the operation plate, and the recycling assembly is arranged in an operation frame; and an operation cooling plate is mounted below the binding plate. The using method of the low-temperature perfusion device comprises the steps that after the limb binding pieces are adjusted, an experimental animal is bound to the upper portion of the binding plate, the two low-temperature perfusion assemblies are filled with a PBS solution and a PFA solution, and then the two low-temperature perfusion assemblies are controlled to conduct PBS solution and PFA solution perfusion on the experimental animal. According to the low-temperature perfusion device, the perfusion function, the low-temperature function and the toxic waste liquid recovery function are integrated, the overall use efficiency of the low-temperature perfusion device is higher, the safety of operators and the environment are better protected, and more importantly, perfusion can be accurately conducted at the small liquid perfusion speed through the ingenious design of the low-temperature perfusion assembly.

The invention discloses a continuous environment-friendly decorative black-plated steel strip based on magnetron sputtering and a preparation method of the continuous environment-friendly decorative black-plated steel strip, and belongs to the technical field of metal material surface treatment.The preparation method comprises the following steps that firstly, vacuum ion bombardment pretreatment is conducted on the steel strip; 2, argon and acetylene gas are introduced into reel-to-reel magnetron sputtering equipment, and a chromium target and / or a titanium target are / is adopted for sputtering; thirdly, a chromium carbide bottom layer and a titanium carbide surface layer are sequentially deposited; and 4, controlling the color and the performance of the plating layer by regulating and controlling the gas proportion, the sputtering power, the film layer thickness and the winding speed. Inert gas sputtering is adopted, no toxic waste liquid is discharged, and the RoHS standard is met; and the film layer is compact, strong in adhesive force and uniform in thickness, and the deviation is controlled within + / -1.2%.

The invention discloses a method for preparing an environment-friendly brick from waste incineration fly ash, belongs to the technical field of waste incineration fly ash recycling and reusing, and aims to solve the problems that fly ash needs to be added as a raw material component for brick making, but the fly ash is often enriched with various heavy metal substances, so that the ecological environment and human health are harmed. According to the invention, the waste incineration fly ash is used as a core raw material and is matched with the components such as the cement, the rice hull ash, the ceramic waste and the silica fume, fly ash does not need to be added in the whole process, ecological and health risks caused by enrichment of heavy metals in the fly ash are avoided from the source, the rice hull ash and the ceramic waste are non-toxic wastes, and after the rice hull ash is subjected to refined treatment, the cost is low. Rich silicon dioxide can participate in cement hydration reaction, the interface structure of the brick body is optimized, the overall compactness is improved, the ceramic waste forms stable aggregate after being subjected to multi-stage crushing, brick body framework support is enhanced, shrinkage deformation is reduced, and the environment-friendly brick has excellent compressive strength and breaking strength through the synergistic effect of the silicon dioxide and the ceramic waste and other raw materials.

The invention provides a synthesis method of an ether compound, which is characterized in that a compound as shown in a formula (1) is used as a raw material and reacts in an organic solvent under the action of triethylamine hydrobromide (Et3N.HBr) to generate the ether compound as shown in the formula (1). According to the method provided by the invention, the Et3N.HBr which is low in price, easy to obtain and commercialized is adopted as the accelerant, and direct cross etherification between two alcohol molecules is realized under a mild reaction condition. According to the method, water is used as a unique by-product, so that toxic wastes and a large amount of inorganic salt wastes generated in the prior art are fundamentally avoided; meanwhile, the method has wide substrate applicability, can be efficiently compatible with various complex enol substrates including alkali-sensitive groups, acid-sensitive groups and secondary alcohol and tertiary alcohol structures, is simple and convenient to operate, does not need special equipment, and provides an efficient, economic, environment-friendly and easy-to-scale new way for synthesis of ether compounds.

Electrochemistry is used to generate active nitrating species from nitrate salt in situ in an aprotic solvent to eliminate acidic and / or toxic waste streams associated with the production of energetic materials. The systems / methods perform alcohol nitration without using nitric acid and / or sulfuric acid. As a result, the systems / methods may be operated under milder conditions (e.g., room temperature and ambient pressure). In addition, the disclosed systems / methods offer high product selectivity via controlling electrolysis potential. The electrochemical synthetic method is scalable, highly amenable to continuous processing and can make use of inexpensive feedstocks, making the systems / methods well-suited to large-scale manufacture.

The invention relates to a toxic waste gas diffusion monitoring method and system based on machine learning, and the method comprises the following steps: S1, collecting environment index data in real time through a gas sensor and a meteorological sensor disposed in a monitoring area, the environment index data at least comprising pollutant concentration, wind speed, wind direction, environment temperature and humidity; s2, a pollution source feature vector P = (p1, p2) is constructed based on the environmental index data collected in the step S1, p1 represents a pollutant emission intensity index calculated according to real-time monitoring data, and p2 represents a type identifier obtained based on pollutant chemical component analysis; s3, calculating a risk degree score of each monitoring point by adopting an improved entropy weight-TOPSIS comprehensive evaluation algorithm; s4, according to the risk degree score obtained through calculation, toxic waste gas diffusion early warning information is generated in combination with a double-threshold judgment mechanism, and therefore environmental pollution and safety accidents caused by toxic waste gas leakage are better prevented.

The invention discloses a silicon carbide seed crystal surface roughening treatment process which comprises the following steps: S1, placing a silicon carbide seed crystal to be treated on a bearing frame in a treatment tank and fixing the silicon carbide seed crystal; s2, adding deionized water into the treatment tank until the seed crystals are completely immersed; s3, a driving device is started, and the multiple rotary drill bits are driven to rotate at the same time; s4, the drill bit is controlled to move downwards, so that the drill bit makes contact with the seed crystal bonding surface, and a plurality of evenly-distributed micropores are drilled in the surface of the seed crystal bonding surface; s5, after drilling is completed, the seed crystals are taken out of the treatment tank, and surface roughening treatment is completed; and S6, washing the treated seed crystal with deionized water, and drying. According to the equipment, seed crystals are immersed in deionized water for micropore treatment so as to realize rough treatment on the surfaces of the seed crystals, the operation is convenient and simple, the safety is high, toxic waste liquid is not generated, and the equipment is environment-friendly.

The invention discloses a method for preparing molybdenum disulfide-rich residues from molybdenite, and belongs to the technical field of metallurgical extraction. The method for preparing the molybdenum disulfide-rich residues from molybdenite comprises the following steps that molybdenite powder, sodium phosphate powder and borax powder are added into a containing cavity of a graphite crucible, and smelting raw materials are obtained; the smelting raw materials are smelted in a vacuum or argon atmosphere and then cooled, and residues are obtained; and the residues are sequentially subjected to water soaking and citric acid soaking and then washed and dried, and residues rich in molybdenum disulfide are obtained. The preparation method disclosed by the invention can avoid the generation of strong-toxicity waste liquid, and residues rich in molybdenum disulfide can be obtained in an environment-friendly and efficient manner.

The invention relates to a carbon coating slurry for a lithium ion battery and a preparation method thereof, and the carbon coating slurry comprises the following components in parts by weight: 8-12 parts of a compound conductive phase which is obtained by compounding at least two carbon series conductive agents; 130-150 parts by weight of a solvent, wherein the solvent is deionized water; 40-50 parts by weight of a binder, wherein the binder is one of acrylic resin and water-based styrene-acrylic emulsion or a mixture of the acrylic resin and the water-based styrene-acrylic emulsion; 1.2-2.0 parts by weight of a dispersing agent, wherein the dispersing agent is a compound dispersing agent of PVP (Polyvinyl Pyrrolidone) and CMC-Li; 0.8-1.2 parts by weight of a functional auxiliary agent, wherein the functional auxiliary agent is formed by compounding a rheology modifier, a coupling agent and a defoaming agent; and the viscosity of the carbon coating slurry at the temperature of 25 DEG C is 2200 mPa.s to 2800 mPa.s. The construction efficiency of a carbon coating slurry conductive network is improved, the conductivity is high, no toxic waste gas is discharged in the production process, and the production environmental protection cost and the safety risk are greatly reduced.

The invention discloses a non-woven fabric bag for water-based ink flexographic printing and a forming process, and belongs to the technical field of non-woven fabric bags. The non-woven fabric bag comprises a non-woven fabric bag body, and the non-woven fabric bag body is of a multi-layer composite structure and sequentially comprises a printing layer, an adhesive layer, a bright protection layer, a first bonding layer, a non-woven fabric base material layer, a second bonding layer and a blocking layer from outside to inside. Water-based ink is adopted to replace traditional oil-based ink, a solvent-free composite technology is matched, no VOCs and other toxic waste gas and waste liquid are discharged in the whole process, environmental pollution and occupational health risks of operators are completely eradicated from the source, and the green production requirement is met; through the combined design of flexographic printing and wear-resistant matte varnish coating, a printed pattern has excellent scratch resistance, wear resistance and fading resistance, meanwhile, high peel strength of each layer is ensured by a solvent-free compounding and full curing process, a layering phenomenon is avoided, and the durability of a product is remarkably improved.

This invention relates to a method and system for monitoring the diffusion of toxic waste gas based on machine learning, comprising the following steps: S1, collecting environmental indicator data in real time using gas sensors and meteorological sensors deployed in the monitoring area, wherein the environmental indicator data includes at least pollutant concentration, wind speed, wind direction, ambient temperature, and humidity; S2, constructing a pollution source feature vector P=(p1,p2) based on the environmental indicator data collected in step S1, wherein p1 represents the pollutant emission intensity index calculated based on real-time monitoring data, and p2 represents the type identifier obtained based on the chemical composition analysis of pollutants; S3, calculating the risk score of each monitoring point using an improved entropy weight-TOPSIS comprehensive evaluation algorithm; S4, generating toxic waste gas diffusion early warning information based on the calculated risk score and combined with a dual threshold judgment mechanism, thereby better preventing environmental pollution and safety accidents caused by toxic waste gas leakage.

This invention belongs to the field of geochemistry and discloses an apparatus and method for the conversion of silver sulfide to sulfur hexafluoride for polysulfide isotope determination. The apparatus includes a basic vacuum module, a reaction and extraction module, a purification module, a sample collection module, and a waste gas treatment module. The basic vacuum module provides a high vacuum environment for the system. The reaction and extraction module is used for the silver sulfide fluorination reaction and preliminary extraction of sulfur hexafluoride. The purification module is used for the separation and purification of sulfur hexafluoride. The sample collection module is used for the collection and preservation of purified sulfur hexafluoride. The waste gas treatment module is connected to the reaction and extraction module and includes a fully sealed waste gas absorption tank with an alkali metal hydroxide absorbent inside. Both ends are connected to the vacuum system via valves. This invention enables online chemical absorption of toxic waste gases from fluorination reactions, eliminating the safety hazards of traditional waste gas treatment methods and ensuring the safety and reliability of the sample pretreatment process for polysulfide isotope determination.

The invention belongs to the technical field of waste gas combustion, and particularly relates to an electromagnetic heating coil waste gas combustion device with a purifying and filtering mechanism, the electromagnetic heating coil waste gas combustion device comprises a combustion assembly and a cooling assembly located on the right side of the combustion assembly, and the cooling assembly comprises a spray tower. According to the invention, disinfected waste gas is discharged into the spray tower from the top of the spray tower, and spray water is input into the high-pressure spray head by using the circulating pump to be sprayed out, so that fine and dense liquid drops are generated, and rapid cooling and high-temperature air mass crushing are realized; spraying water is input into the spraying pipe from the connecting pipe to be sprayed out and is matched with the pore plate corrugated packing, so that gas and liquid phases form a liquid film on the surface, and efficient heat and mass transfer is carried out; and spraying water is input into the conical spraying head from the other connecting pipe to be sprayed out, the gas to be discharged is finally washed, a liquid sealing effect is achieved, gas short circuit is prevented, and the problems that a toxic waste gas treatment device generated in industrial production is relatively bloated, the treatment mode is relatively slow, and the working efficiency is reduced are solved.

The invention relates to the technical field of two-dimensional sheet turbid liquid preparation, and discloses a two-dimensional sheet turbid liquid, a preparation method and application, the preparation method comprises the steps of raw material preparation, mixing dissolution, standing stripping and stable molding, and the raw materials comprise a two-dimensional sheet composition raw material, a hydrogen peroxide aqueous solution, a catalyst, a stabilizer, a functional additive and water; the hydrogen peroxide aqueous solution contains less than or equal to 8% by weight of hydrogen peroxide; the catalyst and the stabilizer have a synergistic effect, efficient interlayer stripping of the two-dimensional sheet-shaped composition raw materials is achieved under the mild condition, and the safety risk and supervision limitation of high-concentration hydrogen peroxide are avoided. The preparation method is safe, controllable, low in energy consumption and free of toxic waste liquid and waste gas, ton-level amplification production can be achieved, and the prepared turbid liquid is high in stability and can be directly applied to the fields of high-temperature protection, fire extinguishment, chemical catalysis, adsorption filtration and the like or applied to the fields of high-temperature protection or simple post-treatment.

The utility model discloses a laboratory toxic waste liquid collecting and purifying all-in-one machine which comprises a metal box body, the top of the metal box body is provided with a guiding connector of a waste liquid collecting guiding pipe and a fresh air inlet net opening, and the upper portion of the front face of the metal box body is provided with an instrument installation panel. A waste liquid collecting barrel and a purified gas treatment system are arranged in the box body. The liquid level sensors are arranged inside and outside the waste liquid collecting barrel, so that liquid level rising over-limit can be detected and early warned in time, and toxic waste liquid is prevented from overflowing; by arranging the waste gas purification treatment system, volatile toxic gas, including acid mist, generated by waste liquid is directly guided into the purification treatment system for purification treatment, so that the safety and health of a laboratory environment and experimenters can be ensured; the first TVOC sensor is arranged at the waste gas inlet of the waste gas purification treatment machine and electrically connected with the liquid crystal display screen control system and the exhaust fan, so that when the concentration of waste gas exceeds a set value, the system can be automatically started to operate, and toxic waste gas is automatically purified.

A lithium silicate in-situ modified silicon negative electrode material and a preparation method thereof, wherein a silicon raw material is mixed with an oxidant, a lithium source, a carbon source, and an additive auxiliary material, followed by a hydrothermal reaction, and finally subjected to high-temperature carbonization to obtain a lithium silicate in-situ modified silicon-carbon composite negative electrode material. The composite material is composed of a silicon core and a carbon shell modified in situ by lithium silicate, and a carbon coating layer with a thickness of 20-30 nm is generated on the silicon surface. This method adheres to the principles of green environmental protection in both the selection of raw materials and the preparation process, does not generate toxic waste, and meets the requirements of sustainable development. The prepared finished material has high purity, which helps to improve battery performance and extend its service life. The preparation process of this method is simple, the required equipment is easy to operate, the manufacturing cost is relatively low, and it is suitable for industrial large-scale production.

The utility model discloses a circulating printing oven, which relates to the technical field of printing equipment and comprises an oven cover and an oven body, one side of the oven cover is rotatably connected with one side of the oven body, the other side of the oven cover is movably connected with the other side of the oven body through an opening and closing air cylinder, and a plurality of air blowing ports which are uniformly distributed along the length of the whole cover body are arranged in the oven cover. The side edge of the drying oven body is provided with an opening allowing printed matter to pass through, the air blowing opening is connected to a heat collection box through an air inlet pipe, the heat collection box is connected to a centrifugal fan, the centrifugal fan is connected to a circulating air pipe, and the circulating air pipe is a three-way pipe and is connected to the space in the drying oven body and external air. And a waste discharge port is formed in the oven cover. The circulating printing drying oven is even and efficient in drying, the adjusting performance is improved, the circulating printing drying oven is provided with a heat energy circulating and heat recycling structure, heat loss is small, waste can be discharged, and accumulation of water vapor and toxic waste gas is avoided.

The invention provides an efficient acrylonitrile waste gas incineration system, which relates to the technical field of acrylonitrile waste gas incineration and comprises a waste gas pretreatment unit, a graded incineration unit, a combustion-supporting system, a waste heat recovery unit, a deep denitration unit, a flue system and a control system. After gas-liquid separation, the waste gas is heated step by step through a low-temperature AOG preheater and a high-temperature AOG preheater; cracking in a reduction section of an incinerator, fully combusting in an oxidation section, and preliminarily denitrifying in an SNCR section; and flue gas is subjected to heat recovery through a waste heat boiler, and is discharged after reaching the standard after being deeply denitrified by an SCR reactor. Harmless treatment of highly toxic waste gas is achieved, the gradient utilization rate of energy is increased by 40%, NOX emission is smaller than 50 mg / m, and the problems of high pollution and high energy consumption in the prior art are solved.