94results about How to "Capture" patented technology

The invention discloses a heavy metal stabilizing agent and a method for treating heavy metal contaminated soil by using the heavy metal stabilizing agent. The heavy metal stabilizing agent is prepared from the following raw materials in percentage by weight: 40 to 50 percent of phosphate, 20 to 25 percent of bentonite, 25 to 30 percent of fluor apatite and 4 to 6 percent of sodium chloride / potassium chloride. When the heavy metal stabilizing agent is used for treating the contaminated soil, the heavy metal stabilizing agent and water are mixed together to form a suspension, then the suspension is added into the heavy metal contaminated soil, and the suspension and the heavy metal contaminated soil are fully mixed. The heavy metal stabilizing agent has high stability for treating soil, and the technical problem that the conventional curing agent and curing method cause reverse dissolution easily is solved.

A wind turbine including a stator assembly having a plurality of stator blades for tangentially redirecting wind into a rotor assembly having a plurality of vertical rotor blades disposed circumferentially on a plurality of disks stacked one on top of each other. Each disk defines at least one opening thereon for redirecting the wind axially through each of the disks.

A wind turbine including a stator assembly having a plurality of stator blades for tangentially redirecting wind into a rotor assembly having a plurality of vertical rotor blades disposed circumferentially on a plurality of disks stacked one on top of each other. Each disk defines at least one opening thereon for redirecting the wind axially through each of the disks.

The invention discloses a method for producing partial full-oxygen type cement suitable for separation and collection of CO2, which is a cement production process combining a process of pre-decomposing cement raw materials by using full-oxygen combustion and a process of baking clinkers by using conventional heated air combustion and can effectively solve the problems of the separation and collection of the CO2 in the cement production process. The raw materials subjected to the decomposition of carbonate in a decomposing furnace are separated through a fifth-stage cyclone and enter a rotary kiln, and the combustion way of the rotary kiln is different from the conventional way; the other part of heated air is discharged by a grate cooler to serve as secondary air for combustion, wherein the temperature of the firing zone in the kiln reaches 1,800 DEG C; the heat from fuel combustion is transmitted to materials; the materials are calcined into clinkers; the clinkers from the rotary kiln enter the grate cooler and then enter a rear material receiving device after being cooled; smoke from the rotary kiln enters a right five-stage preheater and is mixed with the heated air from the grate cooler at the output of the five-stage preheater; and the mixed air enters a fourth-stage preheater, gradually rises and is discharged from the top of a first-stage preheater to an exhaust gas processing system.

The invention provides an analysis method and system for a gas phase combustion product of a cigarette. The analysis method comprises the following steps of: putting tobacco leaf powder in an oxygen-containing gas atmosphere for cracking at the same temperature; completely cooling a cracking product, filtering particle phase constituents through a Cambridge filter; adsorbing the gas phase ingredients by adopting an adsorption sampling pipe; and performing thermal desorption on the adsorption sampling pipe, and entering a gas-mass combined spectrometer for analyzing. Correspondingly to the analysis method, a commercial SGE (Severable Government Equipment) microwave cracker is improved, so that capturing of the gas phase constituents of the cracking product is realized for the first time, and the gas phase constituents are subjected to qualitative and quantitative analysis. The analysis method and the analysis system can be used for discovering the formation mechanism of harmful ingredients in smoke, and a theoretical foundation is laid for the researches of depression of the tar and reduction in harmfulness of cigarettes.

An electrostatic bag closely hybrid dust remover and the operation method are mainly used for the flue gas disposal in a power plant etc. A grounding collecting plate is placed between a high voltage discharge electrode and the bag inside a dust removing room. An electrostatic dust removing area is formed by two sides of the high voltage discharge electrode and the grounding collecting plate; a filtering and dust removing area is formed by two sides of the bag and the grounding collecting plate. When the bag filters, the grounding collecting plate is closed, and the flue gas enters into the dust removing room and goes through the electrostatic dust removing area to arrive at the end of the grounding collecting plate and then enters into the filtering and dust removing area. When the bag reversely blows and cleans ash, the grounding collecting plate opens, the gas and dust for reverse blowing and ash cleaning pass through the grounding collecting plate directly and reach the electrostatic dust removing area, and the dust for reverse blowing and ash cleaning is collected by static electricity. Compared with the prior invention, the dust removal is separated into two steps: when the bag filters, an electrostatic dust remover is completely used to greatly reduce a dust-containing concentration of the flue gas which enters into the bag; when the bag reversely blows and cleans ash, the electrostatic dust remover is used to effectively remove the dust for ash cleaning.

The invention provides a method for preparing calcium carbonate by using calcium carbide slag and low concentration carbon dioxide-containing waste gas as raw materials, which comprises: calcining, digesting and refining calcium carbide slag to obtain calcium hydroxide suspension; and performing the carbonation of the calcium hydroxide suspension and a flue gas or kiln gas, which is purified by desulfuration, dedusting and the like and contains 5 to 15 volume percent of carbon dioxide, under a pressurized condition in a carbonizer to produce light calcium carbonate or nano calcium carbonate. In the invention, a technique for producing calcium carbonate series products by suing calcium carbide slag as raw materials is combined with a technique for recovering carbon dioxide from gas in a coal-burning flue, so the low concentration carbon dioxide in the flue gas is captured, solidified, sealed and stored while the high-added value calcium carbonate products; and thus, the treatment of waste by waste and change of waste into resources are realized.

A method for collecting data includes the steps of equipping vehicles in a fleet of vehicles, performing a primary service, with imaging equipment and capturing geographical data using the imaging equipment for later use in a store of geographical data.

The invention relates to an atmospheric aerosol trapping method and a device thereof. The method is characterized in that an electrical heating rod is utilized to heat pure water in continuous constant current to generate vapor; the vapor meets atmospheric airflow in a cavity where an aerosol absorbs moisture and expands; with the stay of the vapor airflow in the cavity where the aerosol absorbs moisture and expands, and with the natural cooling action, the aerosol absorbs moisture and expands; the airflow takes the aerosol which absorbs moisture and expands to a snake-shaped cooler to cool the vapor airflow into a solution, and the aerosol is trapped in the solution; the airflow with the solution formed through condensation realizes the separation of the air and the solution in an aerosol impact collector, and the collection of the aerosol. The aerosol trapping device comprises an air course part, a vapor generating part for providing vapor for the air course, a cooling device for cooling the air course circularly, and a circuit part for controlling the vapor generating part, the air course part and the cooling device. The method and the device can effectively realize the quick trapping of aerosol and on-line automatic analysis of the chemical composition of the aerosol.

The invention provides heat-supply and carbon-dioxide capturing system and method, which can effectively utilize a heat source and simultaneously capture carbon dioxide. The system comprises a water-vapor condensing heat exchanger, a gas-liquid separator, a carbon-dioxide storage tank, a carbon-dioxide condensing heat exchanger, a carbon-dioxide absorption tower, a carbon-dioxide absorption-liquid regeneration tower and a chemical-chain combustion reactor, wherein the water-vapor condensing heat exchanger is used for condensing water vapor in the mixed gas of the carbon dioxide and the water vapor; the gas-liquid separator is used for separating the liquid water and the carbon-dioxide gas from the water-vapor condensing heat exchanger; the carbon-dioxide condensing heat exchanger is used for condensing the carbon-dioxide storage tank; the carbon-dioxide absorption tower is used for absorbing the carbon dioxide; the carbon-dioxide absorption-liquid regeneration tower is used for regenerating an absorption enriched liquid; copper oxide and nickel oxide used as oxygen carriers are at least filled in the chemical-chain combustion reactor; the reduction reaction of the oxygen carriers or the regeneration reaction of the oxygen carriers is carried out in the chemical-chain combustion reactor; and the chemical-chain combustion reactor is used for supplying the reaction product of the reduction reaction of the oxygen carriers for the carbon-dioxide absorption tower and supplying regenerated heat for the reboiler of the carbon-dioxide absorption-liquid regeneration tower.

The invention discloses a device for wireless control of camera and flashlights working state parameters and a control method thereof. The device comprises a computer, a USB (Universal Serial Bus) transceiver, a wireless transceiver, a digital camera and an external flashlight, wherein the USB transceiver is connected with a computer, and the wireless transceiver and the digital camera and / or the external flashlights are connected. When the device is used, the computer is used for sending an instruction to the wireless transceiver through the USB transceiver in a wireless manner, the wireless transceiver receives the instruction, then converts the instruction into readable information for the digital camera and / or the external flashlight, and then transmits the readable information to the digital camera and / or the external flashlights connected with the wireless transceiver, the digital camera and / or the external flashlights can transmit the changed information back to the USB transceiver through the wireless transceiver, the USB transceiver transmits the changed information back to the computer, and thus, the regulation and control of the working state parameters of the digital camera and / or the external flashlights are realized. According to the device and the method, the working state parameters of the digital camera and a plurality of flashlights can be regulated remotely and wirelessly.

The invention discloses a desulfurization and denitration ammonia-removing system. The system comprises an adsorption tower, a desorption tower, a distributor, a first activated carbon conveyer and asecond activated carbon conveyer. One side of the adsorption tower is provided with a smoke inlet A, and the other side of the adsorption tower is provided with a smoke outlet B, the interior of the adsorption tower is provided with an adsorption cavity and an ammonia-removing cavity, the adsorption cavity is installed at one side adjacent to the smoke inlet A, the ammonia-removing cavity is installed at one side adjacent to the smoke outlet B, the first activated carbon conveyer is connected with a discharging port of the adsorption tower and a feeding port of the distributor, the second activated carbon conveyer is connected with a discharging port of the desorption tower and a feeding port of the adsorption cavity, a discharging port of the distributor is respectively connected with a feeding port of the ammonia-removing cavity and a feeding port of the desorption tower. The system adopts a mode that the adsorption tower is divided to two functional areas. The adsorption reaction cavity is capable of achieving the functions of desulfurization, denitration, dust removal and the like. The ammonia-removing cavity is filled with fresh activated carbon or acidic activated carbon, andis capable of gathering ammonia in smoke passing through an adsorption reaction layer, and effectively preventing the ammonia at the outlet from escaping.

The invention relates to a diffused gas utilizing system and method. The diffused gas utilizing system comprises a chemical-looping combustion reactor. The chemical-looping combustion reactor is filled with metal oxygen carriers. Diffused gas is fed into the chemical-looping combustion reactor and reacts on the oxygen carriers. The oxygen carriers are mainly composed of Fe-based oxygen carriers, and Cu-based carriers are added according to a certain proportion. The flowing direction of the diffused gas and the flowing direction of air in the chemical-looping combustion reactor are made opposite through switching of a valve, so that the problem that the diffused gas cannot be used easily due to the facts that the potential safety hazards are large and the diffused gas is exhausted intermittently is solved, and accordingly safe, clean and efficient utilization of the diffused gas is achieved.

The invention discloses preparation methods of a porous structured material selectively adsorbing and separating a CO2 gas, and belongs to the technical field of porous structured material preparation. A preparation method 1 comprises the following steps: putting zinc oxide, 2-methylimidazole and acetate in a ball milling jar, adding small stainless steel balls, adding ethanol, and carrying out ball milling to obtain a solid a; 2, cleaning the solid a by using methanol, and drying at 60DEG C to obtain a solid b; and calcining the solid b in a tubular furnace in nitrogen atmosphere to obtain a solid c which is the porous structured material. A preparation method 2 comprises the following steps: adding a nitrate A, 2-methylimidazole and a nitrate B into a solvent, mixing and stirring at normal temperature, centrifuging to obtain a solid d, cleaning the solid d by using methanol, and drying at 60DEG C to obtain a solid e; and calcining the solid e in the tubular furnace in nitrogen atmosphere to obtain a solid f which is the porous structured material. The methods have the advantages of simplicity, high yield, large output, extremely few solvent, environmental protection and high efficiency.

The invention discloses a gas-fired boiler system and an operation method thereof, wherein the gas-fired boiler system comprises a first chemical chain combustion reactor and a second chemical chain combustion reactor, wherein the first chemical chain combustion reactor and the second chemical chain combustion reactor are filled with oxygen carriers; when fuel gas is introduced into either the first chemical chain combustion reactor or the second chemical chain combustion reactor for reducing the oxygen carriers, air is introduced into the other chemical chain combustion reactor for oxidizing the oxygen carriers; through switching a fuel gas pipeline and an air pipeline, the oxygen carriers in the first chemical chain combustion reactor and the second chemical chain combustion reactor are alternately oxidized and reduced; during the oxidization and reduction reaction, heat is provided for a heat supply medium. The gas-fired boiler system has high heat energy utilization rate.

The embodiment of the invention discloses a vehicle illegal parking behavior detection method and device and a medium. The method comprises the following steps: acquiring a long-range image of an illegal parking area by using a dome camera; analyzing the distant view image based on a deep learning vehicle detection algorithm to extract vehicle feature information of each vehicle in the illegal parking area; and controlling the dome camera to acquire close-range images of the vehicles in the illegal parking area in a zooming manner. If a target vehicle whose stay time exceeds a preset time limit value exists in the illegal parking area, a license plate recognition algorithm is used to recognize a close-shot image of the target vehicle, and if a recognition result does not meet a license plate recognition requirement, when it is detected that the target vehicle moves out of the illegal parking area, the dome camera is controlled to collect a close-range image of the target vehicle leaving the illegal parking area in a zooming manner; and the close-range image of the target vehicle leaving the illegal parking area is recognized by using a license plate recognition algorithm to obtain the license plate number of the target vehicle. By collecting the close-range image of the target vehicle leaving the illegal parking area, the snapshot problem of the illegal parking vehicle with the shielded license plate is effectively solved.

The invention discloses a method and a device for preparing H2 and separating CO2 based on a calcium-based sorbent. The method comprises that a calcium-based sorbent and pulverized coal are fed into a gasification reactor by a screw charging machine; the pulverized coal is gasified by steam to produce water gas; CH4 in the water gas is reformed into CO and H2 and CO undergoes conversion reactions to produce CO2 and H2; CO2 is absorbed by the calcium-based sorbent; H2 and residual CO2 enter into an absorption reactor; unreacted coke and CaCO3 enter into a calcination reactor; pure oxygen is fed into the calcination reactor; the coke and the pure oxygen burn and produce CO2; CaCO3 is decomposed into CaO and CO2; after separation adopting a separator, CO2 enters into a preheater and gives out heat; CaO is separated into two parts by a returning valve and one of the two parts enters into the gasification reactor and the other one of the two parts enters into the absorption reactor; CaO in the absorption reactor absorbs residual CO2 and produces CaCO3; after separation adopting a separator and condensation, clean H2 is obtained; and the separated CaCO3 enters into the calcination reactor so that sorbent recycle is realized.

The invention provides a box camera and dome camera integrated dynamic face snapshotting special-purpose video camera, which comprises an integrated machine body, a first camera module, a second camera module and a main control chip, wherein the first camera module and the second camera module are integrated in the integrated machine body, and are in communication connection with the main controlchip respectively; the first camera module is fixed to the front part of the integrated machine body, and is used for acquiring large-scale scene images; the main control chip is arranged inside the integrated machine body, performs preliminary detection on all targets according to the large-scale scene images and determines a target to be snapshotted; and the second camera module is arranged at the bottom part of the integrated machine body, tracks and magnifies the target to be snapshotted under the control of the main control chip, and acquires a face image of the target to be snapshotted.The invention further provides a dynamic face snapshotting method based on the box camera and dome camera integrated dynamic face snapshotting special-purpose video camera.

The invention discloses an intelligent tracking and photographing system, comprising a camera, which is used for photographing a specific object; A photographing moving unit for loading the camera andrealizing the adjustment of the distance and the angle between the camera and the specific object; An artificial intelligence processing unit for controlling the movement of the photographing movingunit and controlling the camera to automatically photograph, and processing and outputting photographing data; The central management unit is configured to receive a shooting menu selected by a user through a communication interface, instruct an artificial intelligence processing unit to track shooting of a specific object according to shooting menu control, and supply shooting data to the specific object. The invention can carry out intelligent tracking shooting according to user requirements, and can store the cloud end in real time, thus realizing more efficient, simplified and intelligentshooting.

The invention discloses an oxygen-enriched combustion system based on novel chemical chain oxygen production. The oxygen-enriched combustion system mainly comprises an air compressor, an air preheater, a first reactor, a second reactor, a first heating device, a second heating device, a boiler and an acting device, wherein an inlet of the air compressor communicates with an air supply pipeline, anoutlet of the air compressor communicates with a first inlet of a first four-way valve through the air preheater, a first outlet of the first four-way valve communicates with an inlet of the first reactor, a second outlet of the first four-way valve communicates with an inlet of the second reactor, and oxygen-carrying bodies are arranged in the first reactor and the second reactor respectively. The invention further discloses an oxygen-enriched combustion method based on the novel chemical chain oxygen generation. The oxygen-enriched combustion system has the beneficial effects that the air compressor is used for pressurizing and heating the air entering the reactors, oxygen absorption reaction occurs under the condition that the oxygen-carrying bodies in the reactors is higher than the oxygen-releasing temperature of the oxygen-carrying bodies, the heat absorbed by the oxygen-carrying bodies is accumulated by the oxygen-carrying bodies and inert carriers, and the heat of the oxygen-carrying bodies and the inert carriers are used for supplying self-release oxygen.

A network of automated launch and recovery platforms (LRPs) for at least one aircraft-type aerial vehicle (UAV) which automatically perform cyclic tasks of preparation, launch, and recovery without manual operation is provided. Each LRP includes a stationary foundation in an X-Z plane, a rotatable foundation that can rotate around a Y axis of the stationary foundation, and a rotatable leverage that rotates around the Z axis at a shaft driven by a motor. A first leverage of the UAV is hooked to the rotatable leverage of the LRP such that rotation of the shaft by the motor drives the rotatable leverage and the UAV for take-off and reduces UAV to stop during recovery. The network includes a traffic control subsystem and a launch and recovery subsystem which provides initial UAV speed necessary for launch, and ensures dissipation of kinetic energy of a captured UAV during recovery.

The invention discloses an anode plate and a wet electric precipitator. The electric precipitator comprises a casing, wherein the casing comprises a smoke inlet and a smoke outlet; an anode dust collecting system is arranged in the casing and comprises multiple anode plates spaced by set distances; at least one bulge is arranged on the surface of each anode plate, and the protruding direction of each bulge and the flowing direction of smoke flowing through the anode plate are perpendicular to each other or intersect with each other to form a set angle, so that the turbulent effect of the smoke is improved; and a cathode system is arranged between every two adjacent anode plates. The bulges are arranged on the anode plates, and the protruding directions of the bulges and the flowing direction of smoke flowing through the anode plates are perpendicular to each other or intersect with each other to form the set angle, so that the turbulent effect of the smoke is improved, coagulation of the smoke is improved, meanwhile, the smoke is trapped under the inertia effect, the dust removal efficiency of the precipitator can be remarkably improved, and energy is saved; and the bulges are arranged on the anode plates, the multiple bulges are aligned one by one, and thus, the smoke can be balanced and can be uniformly distributed in an electric field area of the casing.

The invention relates to coal-charging and coke-discharging flue dust collecting and purifying device of a coke oven. A coal-charging flue dust collecting device at the machine side is used for collecting and delivering flue gas dissipated at an oven door when coal is charged, and a flue dust collecting and processing vehicle arranged on the oven top is in butt joint with a special coal-charging flue gas transmitting belt trolley to deliver flue dust dissipated at air discharging holes on the oven top; flue dust dissipated during discharging coke is collected and delivered through a coke side belt sealing air pipe arranged at the outer side of a track of a coke quenching car at the coke-discharging side of the coke oven; the flue gas dissipated at the oven door is delivered to the coke side belt sealing air pipe through a pipeline, the flue dust dissipated at the air discharging holes on the oven top is delivered into the coke side belt sealing air pipe through a gas guiding pipe, and the flue gas and the flue dust are together delivered into a ground dust removing station through a pipeline of an output port of the coke side belt sealing air pipe for purification. The device has the advantages of favorable flue dust gathering effect, high degree of the automation and convenient operation and can continuously, safely and stably run.

The invention relates to a system and a method for directly mineralizing carbon dioxide in flue gas by using gypsum. An absorption tower can sequentially realize cooling, decarburization and escape ammonia trapping processes of desulfurized flue gas; the bottom of a lower cooling section is provided with a slurry area and is circularly connected with an upper ammonium bicarbonate spraying layer, so that the trapping of the waste heat of the desulfurized flue gas can be realized, and heat is provided for the low-temperature concentration and crystallization of ammonium sulfate slurry; the bottom of a middle decarburization section is provided with an ammonium bicarbonate liquid holding layer, and the ammonium bicarbonate liquid holding layer and the ammonium bicarbonate spraying layer form circulation; ammonia is supplemented through an ammonium bicarbonate spraying layer pipeline, so that continuous decarburization reaction can be carried out on cooled flue gas; and meanwhile, the lower cooling section and the middle decarburization section are separated, and a gypsum spraying layer, a demister, a process water spraying layer, a gypsum liquid holding layer and a gypsum spraying layer which are sequentially arranged on the upper deamination section in the height direction form circulating spraying, and the continuous trapping process of escaping ammonia is achieved. The system is simple in structure, reasonable in design and low in smoke decarburization and utilization cost, and meanwhile, continuous online treatment of a large amount of smoke can be achieved.

The invention belongs to the technical field of aftertreatment of marine diesel engine particulate matter emission control, and particularly relates to a reciprocated flowing type marine diesel enginecontinuous catalyzing regenerating diesel oil particle filter. According to the filter, an adverse current oxidation device is used for achieving the principle that ultra-thin organic substance is subject to reciprocated flowing within a self-maintaining period to be subject to oxidation treatment, and the reciprocated flowing type marine diesel engine novel continuous catalyzing regenerating DPFsuitable for a marine diesel engine burning heavy oil. The novel DPF technology is applied into the marine diesel engines burning heavy oil, a marine diesel engine particulate matter control device has the advantages of small flowing resistance, the good particulate matter removing effect, the compact structure, easiness in regeneration, high catalyst sulfur poisoning resistance and the like, integrated matching of the marine diesel engine particulate matter control device and a diesel engine host, an SCR denitration device and a wet-type washing desulfurizer is easily achieved, and the integrated treatment effect of desulfuration, denitration and particulate matter removal of waste gas of the marine diesel engine is achieved.

The invention discloses a desulfurizing system based on a phase-change activated coke dry process. The desulfurizing system comprises a flue gas input pipeline, a condensed water inlet pipeline, a condensed water outlet pipeline, a flue gas phase-change heat exchanger, an activated coke desorption tower, a vibration screen, a chimney and N activated coke desulfurizing adsorption towers, the flue gas inlet pipeline is communicated with a flue gas inlet of the flue gas phase-change heat exchanger, a flue gas outlet of the flue gas phase-change heat exchanger is communicated with flue gas inlets of the activated coke desulfurizing adsorption towers, flue gas outlets of the activated coke desulfurizing adsorption towers are communicated with the chimney, activated coke outlets of the activated coke desulfurizing adsorption towers are communicated with an inlet of the activated coke desoprtion tower, an outlet of the activated coke desorption tower is communicated with activated coke inlets of the activated coke desulfurizing adsorption towers through the vibration screen, and the condensed water outlet pipeline is communicated with a condensed water outlet of a flue gas phase-change heat exchanger. The desulfurizing system is low in desulfurizing cost and high in desulfurizing efficiency.

The invention provides a foamed concrete carbon sequestration method which comprises the following steps of: mixing crushed solid wastes with cement, and stirring the mixed raw materials and hot water to obtain hot slurry; introducing treated clean flue gas generated by a boiler into the hot slurry to enable CO2 in the clean flue gas to react with the hot slurry and complete a cement foaming process; injecting the foamed slurry into a shaping mold for foaming and solidification; feeding the foamed brick obtained after solidification into a carbonation curing chamber, and introducing clean flue gas into the carbonation curing chamber to enable CO2 in the clean flue gas to conduct carbonation curing on the foamed brick; and carrying out autoclaved curing and drying on the foamed brick subjected to carbonation curing by utilizing steam generated by the boiler or steam extracted by a steam turbine. Clean flue gas discharged by a boiler is directly introduced into concrete slurry, aeration and bubble reaction are utilized, and then a hardening reaction is performed for a certain time, so that the foamed concrete brick for directly fixing flue gas and CO2 is formed, and capture, storage and utilization of CO2 in the flue gas are realized at low cost.

The invention discloses a preparation method of a beneficiation wastewater metal trapping agent. The method includes the following steps that 1, monochloroacetic acid of certain weight is weighed at the room temperature and dissolved in water, and an aqueous solution with the weight concentration being 20% is prepared; 2, thiourea of certain weight is weighed and dissolved in water, and an aqueous solution with the weight concentration being 10% is prepared; 3, the thiourea aqueous solution is added to the monochloroacetic acid aqueous solution according to the weight ratio of monochloroacetic acid to thiourea being 1:1.5, the mixture is heated to 90 DEG C, a reaction is conducted for 60 minutes, then the mixture stands still for 24 hours, solid-liquid separation is conducted, and white powder crystals are obtained; 4, the white powder crystals and sodium hydroxide are prepared into an aqueous solution with the concentration being 5% according to the weight ratio of 5:1 for use. The trapping agent prepared through the method can be directly used for treatment of acidic heavy metal wastewater, has the advantages of being high in heavy metal removal rate, capable of removing multiple metal ions at the same time and good in sediment stability and can achieve efficient treatment of copper, lead, zinc, cadmium and mercury in wastewater.

The invention relates to a dry recovery method of partial molten iron-steelmaking coal gas of an arc furnace. The method comprises the following steps: when molten iron is added in the arc furnace and oxygen-blowing and decarburization are performed, the micro-positive pressure in the arc furnace is ensured, then exhaust gas is cooled, dedusted and performs spark collection, the temperature is reduced to 150-180 DEG C, the dust content is not more than 30mg / Nm<3>; clean exhaust gas is sent to a coal gas switching station, if meeting the recovery conditions, the exhaust gas is sent to a coal gas cooling tower, the coal gas is cooled and then sent to a gas chamber, then a coal gas pumping station is used to pressurize and send the coal gas to each user; and if not meeting the recovery conditions, the exhaust gas is ignited and discharged through an emission chimney. The invention is characterized in that the process flow is simple, the existing devices can be fully used, the coal gas resource of arc furnace steel making can be effectively recovered, the recovery rate is not less than 80%, the economic benefit of the smelting enterprise is increased, and the air pollution caused by coal gas is reduced.