283 results about "Thermal desorption" patented technology

The invention discloses an injection molding high-density alloy steel sintering integrated preparation process, which comprises the steps of alloy raw material proportioning, feed preparation, injection molding, continuous thermal desorption sintering treatment and enhanced heat treatment, and comprises the following steps: selecting gas atomization pure iron powder subjected to vacuum reduction treatment, and matching with chromium, nickel, molybdenum, vanadium, carbon, silicon, manganese and iron powder multi-component alloy proportioning; a phenolic resin-polyformaldehyde composite binder is adopted, 0.5-1.5% of a lubricating additive is added, internal mixing parameters are controlled under the protection of inert gas according to the powder-to-rubber ratio of 72-77%: 23-28%, and the problem that the compatibility of a single binder and alloy powder is poor is solved; three-section gradient temperature control injection molding and a continuous atmosphere furnace sectional degreasing-sintering integrated process are combined, and strengthening heat treatment is matched, so that sufficient diffusion of elements and densification of a green body are realized, and defects are avoided. The technology effectively solves the technical problems that traditional raw materials are high in impurity content and insufficient in element diffusion, and therefore the alloy steel sintering preparation efficiency can be improved.

The invention belongs to the technical field of expiration detection, and particularly relates to an intelligent expiration tail end gas sampling device and method. The device specifically comprises a shell, a circuit board, a carbon dioxide sensor, a pressure sensor, a baffle, a top cover, a suspension plate, an air pump, a relay, a breathing mask, a mask connector with an internal small cavity, a thermal desorption tube, a TD tube, a Bluetooth module, an air path channel, a silicone tube and the like. End-expiratory gas collection is achieved through accurate triggering and flow control, and dead space gas mixing is avoided; collected gas is directly enriched into a thermal desorption (TD) adsorption tube, so that the loss of VOCs in the transmission and storage process is reduced; and through quantitative sampling volume control and an optimized pipeline material / structure, the adsorption / release and background pollution of the device body to the sample are reduced, so that the representativeness and sensitivity of sampling and the repeatability among different operators / different places are improved.

The invention provides a dry-process low-temperature pulse iodine positive electrode preparation method and a battery, and relates to the technical field of iodine positive electrode preparation, the iodine positive electrode preparation method comprises the following steps: mixing elemental iodine with activated carbon to obtain a carbon-iodine composite material, then putting the solid powdery carbon-iodine composite material, a conductive agent and polytetrafluoroethylene into a high-speed stirrer, and stirring at a high speed; and sequentially carrying out constant-speed intermittent pulse stirring, speed-reducing pulse stirring and speed-increasing pulse stirring, and finally rolling to obtain the iodine positive electrode. According to the stirring operation, the temperature rise effect in the high-speed stirring process is inhibited, the mixture obtained after polytetrafluoroethylene fiberization is obtained through low-temperature pulse stirring, the surface of the prepared iodine positive plate is smooth and flat, the cracking phenomenon does not exist, the shearing force is regulated and controlled through low-temperature pulse stirring, mechanical disturbance is weakened, and the iodine positive plate has the good application prospect. And the temperature is reduced to inhibit thermal desorption of iodine molecules, so that the damage to the iodine adsorption effect of porous carbon is reduced, and the mechanical strength and electrochemical performance of the electrode are remarkably improved.

The invention relates to an industrial organic polluted soil ectopic thermal desorption carbon emission analysis method which comprises the following steps: dividing ectopic thermal desorption process flows, and determining the type of a carbon emission source generated by each process flow; determining a data acquisition and transmission mode in the ectopic thermal desorption process flow; establishing a carbon emission calculation model of each technological process according to the equipment type and the carbon emission source type in each technological process in combination with the carbon emission factor and the polluted soil treatment volume; on the basis of a carbon emission calculation model in each technological process, ex-situ thermal desorption carbon emission traceability analysis is carried out. According to the method, boundary clearness, data acquisition intellectualization, calculation quantification and analysis traceability of carbon emission in the whole ectopic thermal desorption process are realized, the accuracy and scientificity of carbon emission evaluation are improved, a reliable basis is provided for optimization and emission reduction of a polluted soil remediation process, and the method has good popularization and application values.

The invention discloses an anti-deformation efficient degreasing technology for large-size silicon nitride ceramic, and belongs to the technical field of ceramic products. According to the method, industrial honeycomb-shaped activated carbon is adopted to be processed, so that a blank subjected to thermal desorption is completely matched in the honeycomb-shaped activated carbon, the blank is completely fixed in the activated carbon, and a molten binder is sucked out of the blank under the action of capillary force, so that efficient degreasing is realized, and after the binder in the blank is softened at a high temperature, the binder in the blank is subjected to thermal desorption; according to the technology, the defect that the periphery of the blank is not uniform due to removal of the binder can be overcome, and the blank is embedded in the honeycomb-shaped activated carbon, so that the honeycomb-shaped activated carbon plays a certain role in supporting the blank.

The utility model relates to a thermal desorption treatment device for high-concentration mercury polluted soil, which comprises a feeding device, the feeding device comprises a feeding hopper, the bottom of the feeding hopper is connected with the input end of a conveying belt, the output end of the conveying belt is provided with a spiral conveyer, and the output end of the spiral conveyer is provided with an indirect thermal desorption device; the indirect thermal desorption device comprises a material cavity, a combustion cavity is arranged below the material cavity, and a combustor is arranged below the combustion cavity; the tail part of the material cavity is provided with a gas phase treatment device, the gas phase treatment device comprises a high-temperature ceramic dust remover, the upper end of the high-temperature ceramic dust remover is communicated with the upper end of a first-stage condenser through a pipeline, the first-stage condenser is communicated with the upper end of a second-stage condenser through a pipeline, and the second-stage condenser is communicated with the tail part of the material cavity through a pipeline. The second-stage condenser is connected with the upper end of the freezer through a pipeline, the freezer is connected with the demister through a pipeline, and the demister is communicated with the upper ends of the first-stage adsorption tank and the second-stage adsorption tank through pipelines.

The invention discloses an oily sludge thermal desorption treatment system and a treatment process, the oily sludge thermal desorption treatment system comprises a tank body, the feeding end of the tank body is rotatably provided with a connecting sleeve, the oily sludge thermal desorption treatment system also comprises a feeding pipe, the feeding pipe is fixedly connected in the connecting sleeve, one end of the feeding pipe is sleeved with a material guide pipe, the material guide pipe is movably arranged on the feeding pipe, one end of the connecting sleeve is provided with a cleaning piece, and the cleaning piece is in transmission connection with the tank body. According to the device, the movement of the material guiding pipe is controlled through oil sludge in the feeding pipe, so that the material guiding pipe extends into the tank body along the feeding pipe, the oil sludge is extruded out in a strip shape through the discharging hole, the strip-shaped oil sludge extruded out of the material guiding pipe is broken through the cleaning piece, and the phenomenon that the oil sludge is accumulated at the feeding end of the tank body in a lump mode is reduced; the accumulated oil sludge is prevented from being coked on the inner wall of the high-temperature tank body, the material guide pipe is driven by the cleaning piece to rotate along the axis of the feeding pipe, the inner wall of the feeding pipe is cleaned through the arc-shaped strip fixedly connected in the material guide pipe, and the phenomenon that the feeding pipe is blocked due to the fact that the residual oil sludge is dried and caked in the feeding pipe is avoided.

This invention relates to the field of separation, analysis, and detection technology, specifically an apparatus and method for detecting formic acid and acetic acid in baijiu (Chinese liquor) starter and mash. The apparatus includes a rotary thermal desorption sampler, a headspace thermal desorption sampler, pulse valve I, pulse valve II, ion migration tube I, and ion migration tube II. The gas paths are as follows: one path connects to the rotary thermal desorption sampler via pulse valve I and then to ion migration tube I; the other path connects to the headspace thermal desorption sampler via pulse valve II and then to ion migration tube II. Drift gas is connected to dopant gas and then enters the ion migration tube. After sample treatment with methanol, samples for acetic acid detection are injected via the rotary thermal desorption sampler, and samples for lactic acid detection are injected via the headspace thermal desorption sampler. This invention allows for the separate separation and analysis of lactic acid and acetic acid components, reducing the mutual interference of simultaneous detections. Samples only require methanol extraction for analysis, saving four times the time.

The invention relates to the technical field of heat recovery, in particular to a heat energy recovery management method, device, equipment and medium for a compression heat regeneration drying machine. The method comprises the steps that when high-temperature and high-humidity compressed air generated by an air compressor passes through a switching valve, an air guiding instruction is triggered; high-temperature and high-humidity compressed air is respectively guided to a first drying tower in an adsorption mode and a second drying tower in a regeneration mode; in the regeneration process of the second drying tower, preheating desorption is conducted on the drying agent in the second drying tower through high-temperature compressed air flowing through the first drying tower, and high-temperature regenerated gas is generated; the high-temperature regenerated gas is introduced into a regeneration cooler and exchanges heat with a cooling medium, so that the high-temperature regenerated gas is cooled and condensed, and liquid water is separated out; and the cooling medium after heat recovery is conveyed to a heat utilization unit, heat energy recycling is achieved, and operation parameters of the air compressor and the drying tower are coordinated in real time so as to maintain system pressure balance. The effect of improving the heat recovery efficiency during compression heat regeneration is achieved.

The utility model relates to the technical field of waste incineration fly ash treatment, in particular to an online desorption system for removing dioxin in waste incineration fly ash, which comprises a waste incinerator, a feeding device, a gas-ash separating device, a thermal desorption device, an ash collecting device and a high-temperature circulating fan, the feeding device is used for inputting fly ash generated by waste incineration to the thermal desorption device, and a hot air inlet and a hot air outlet of the thermal desorption device communicate with a smoke outlet of the waste incinerator and an air inlet of the gas-ash separation device correspondingly. An air inlet and an air outlet of the high-temperature circulating fan communicate with an air outlet of the gas-ash separation device and an air inlet of the garbage incinerator correspondingly, and an ash outlet of the gas-ash separation device communicates with the ash collecting device. High-temperature flue gas generated by the garbage incinerator exchanges heat with fly ash entering the thermal desorption device, efficient thermal desorption of dioxin in the fly ash is achieved, the dioxin is gasified and discharged from the exhaust port of the gas-ash separation device along with the high-temperature flue gas, and the dioxin is fed into the garbage incinerator to be thoroughly burned and removed.

The application provides a simple gate oxide integrity testing device, which comprises a test sample and a test structure; the test sample comprises a substrate, a dielectric layer (gate oxide layer) on the substrate, a gate replacement layer used for replacing a gate layer or being located above the gate layer, so that the test sample forms a three-layer structure comprising the substrate-dielectric layer-gate replacement layer, and the gate oxide integrity of the dielectric layer is tested by combining a thermal desorption technology; the test structure is used for accommodating the test sample, providing a test temperature, and recording released elements; the application also provides a simple gate oxide integrity testing method, which has the technical effects of low cost, simple operation, and rapid feedback of test results, and does not need to prepare a transistor device, adopts the gate replacement layer arranged on the substrate-dielectric layer (gate oxide layer) to combine the thermal desorption technology, and directly tests the stacked layer material contained in a MOS stacked layer structure.

This application relates to the field of trace detection technology, and more specifically, to a method for detecting trace gaseous substances, a thermal desorption pre-concentrator, and its preparation method. The preparation method of the thermal desorption pre-concentrator includes: sequentially cleaning, acid-activating, drying, and cutting a metal foam sheet; immersing a metal foam substrate in an adhesive and then removing it; dispersing a particulate adsorbent phase on the surface of the metal foam substrate; guiding the particulate adsorbent phase into and adhering to the internal pore surface of the metal foam substrate through negative pressure filtration to obtain a metal foam substrate loaded with the particulate adsorbent phase; applying a DC voltage to the metal foam substrate loaded with the particulate adsorbent phase; placing the metal foam adsorbent in a housing with an airflow channel, and electrically connecting the metal foam adsorbent to a conductive electrode. This application is advantageous for achieving rapid and complete desorption of the target analyte, improving pre-concentration efficiency, and increasing detection response speed.

The application discloses a quantitative analysis method of tobacco medium-polarity VOCs, which comprises the following steps: S1, inert gas is used to purge tobacco, and meanwhile, the tobacco is heated and sampled, so that the medium-polarity VOCs in the tobacco are collected; and S2, the medium-polarity VOCs in the tobacco are enriched by using MWCNTs-COOH / rGO, then, the medium-polarity VOCs are subjected to thermal desorption, and then, the medium-polarity VOCs are subjected to secondary enrichment and secondary analysis by using a cold trap, and finally, the medium-polarity VOCs are subjected to quantitative analysis by using GC-MS. When the MWCNTs-COOH / rGO is used as the adsorption medium of the thermal desorption of the purge and trap method, the flow rate, time and secondary enrichment temperature of the inert gas purging during the enrichment of the medium-polarity VOCs in the tobacco are simultaneously controlled, so that the quantitative analysis method of the medium-polarity VOCs in the tobacco is established. The enrichment effect of the medium-polarity VOCs in the tobacco is improved, and the accuracy of the quantitative analysis of the medium-polarity VOCs in the tobacco is also improved.

The invention discloses an efficient adsorption and condensation coupled waste gas organic matter recovery system and method, and relates to the technical field of industrial waste gas treatment. Comprising an adsorption concentration unit and an efficient heat exchange and circulation module connected to a desorption gas outlet of the adsorption concentration unit through a pipeline, the deep condensation recovery unit is connected to a desorption gas outlet of the adsorption concentration unit through a pipeline, the catalytic oxidation unit is connected to a heat exchange outlet of the efficient heat exchange and circulation module through a pipeline, and the catalytic oxidation unit is used for controlling the adsorption concentration unit. The energy consumption is obviously reduced by adopting indirect heating desorption and an efficient heat exchange network; the system is high in integration level and capable of achieving full-automatic operation, meanwhile, the recycled organic matter is liquefied and recycled, the resource utilization level is improved, the operation cost is reduced, and meanwhile remarkable environmental protection and economic benefits are obtained.

The invention relates to the technical field of trace detection, in particular to a trace gaseous substance detection method, a thermal desorption preconcentrator and a preparation method of the thermal desorption preconcentrator. The preparation method of the thermal desorption preconcentrator comprises the following steps: sequentially carrying out cleaning treatment, acid activation treatment, drying treatment and cutting treatment on a metal foam sheet; the method comprises the following steps: dipping a metal foam substrate in a binder, taking out the metal foam substrate, dispersing a granular adsorption phase on the surface of the metal foam substrate, and guiding the granular adsorption phase to enter and be attached to the internal pore surface of the metal foam substrate through negative pressure suction filtration, so as to obtain the metal foam substrate loaded with the granular adsorption phase; applying a direct current voltage to the metal foam substrate loaded with the granular adsorption phase; the metal foam adsorption body is arranged in the shell with the airflow channel, and the metal foam adsorption body is electrically connected with the conductive electrode. According to the invention, rapid and sufficient desorption of the target object is realized, and the pre-concentration efficiency and the detection response speed are improved.

The utility model discloses an oil sludge thermal desorption tail gas treatment device which is characterized in that a treatment device main body is of a cubic structure, a plurality of groups of fixing rods are arranged in a filler layer, a plurality of rotatable hollow spheres are fixed on the fixing rods through limiting plates, the bottom of the treatment device main body is of a cone structure, and an annular pipeline is arranged on the cone structure; according to the flue gas treatment device, contact of gas and solid is better achieved, the flue gas treatment effect is improved, the flue gas inlet pipeline extends into equipment for the stability of flue gas inlet, flue gas is dispersed around the flue gas inlet pipeline in a distributed mode, the stability of flue gas exhaust is improved, and the flue gas treatment effect is improved. And the flue gas treatment capacity is further improved.

The utility model discloses an organic polluted soil thermal desorption synergistic remediation system which comprises an organic polluted soil thermal desorption remediation system, a cement clinker production line, an exhaust fan I, a dust collector I, an exhaust fan II, a calcium hydroxide water tank and a sintered soil reservoir. The organic polluted soil thermal desorption repair system comprises an organic polluted soil thermal desorption system, an organic pollutant dry desulfurization lime powder preparation system and an organic polluted soil thermal desorption fuel preparation system. The utility model relates to the technical field of polluted soil remediation, and the organic polluted soil thermal desorption system shares a set of complete environment-friendly system with the existing dry kiln for normal production, so that the organic polluted soil thermal desorption system has more advantages that firstly, the organic polluted soil thermal desorption system has higher treatment efficiency on harmful waste gas generated in the polluted soil remediation process and can realize ultralow emission; 2, the investment and operation cost of environmental protection equipment of the polluted soil thermal desorption system can be saved; and thirdly, pollutant emission can be managed and controlled in a centralized and unified manner, and pollutant emission sources are reduced.

The utility model relates to a thermal desorption type adsorption tank, which is provided with a support and a tank body, a heat exchange device is arranged in the tank body, the heat exchange device comprises an upper end plate, a lower end plate and two heat exchange mechanisms, the upper end plate and the lower end plate are in one-to-one correspondence with carbon discharge pipes, a plurality of carbon inlet holes are arranged on the upper end plate and the lower end plate, two heat exchange areas are arranged in the tank body, and the two heat exchange areas are communicated with the carbon discharge pipes. The heat exchange mechanism comprises first heat exchange pipelines, second heat exchange pipelines and connecting heat exchange pipelines, each first heat exchange pipeline, each second heat exchange pipeline and each connecting heat exchange pipeline comprise a plurality of heat exchange pipes arranged in parallel, upper bent pipes and lower bent pipes, each upper bent pipe is erected above the corresponding charcoal inlet hole in the upper end plate, and each lower bent pipe is erected above the corresponding charcoal inlet hole in the lower end plate. And the lower bent pipes are erected below the corresponding carbon inlet holes in the lower end plate, the first heat exchange pipelines on the heat exchange mechanisms are adjacently arranged, and every two adjacent first heat exchange pipelines are arranged between the oppositely-arranged second heat exchange pipelines. The device is ingenious in structure, convenient and practical.

The invention discloses a passive sampling-thermal desorption combined detection device for organic pollutants in ambient air, and belongs to the technical field of instruments and meters special for environmental monitoring. Comprising a sampling adsorption unit, a thermal desorption sampling unit and an intelligent control unit, the sampling adsorption unit adopts a hollow pipe body structure in which a composite adsorbent is arranged, so that efficient enrichment of organic pollutants is realized; the thermal desorption sample introduction unit enables a sampling pipe to be directly connected with a gas chromatograph through a standardized interface and a rapid sealing device so as to realize lossless sample introduction; the intelligent control unit is provided with a temperature control system and an operation interface, so that accurate regulation and control and data recording of the sampling and desorption process are realized; through an integrated design of homology of detection and extraction, seamless connection of ambient air sampling and instrument analysis is realized, the technical problems of sample transfer loss, solvent pollution and low efficiency in a traditional method are solved, and the method has the characteristics of accurate data, simplicity and convenience in operation and environmental friendliness.

The invention relates to the field of carbon dioxide capture, and provides a carbon dioxide absorbent pregnant solution double-tower cascade catalytic desorption system and method. The carbon dioxide absorbent rich liquor double-tower cascade catalytic desorption system comprises a low-temperature catalytic desorption tower, a solid acid catalyst packing layer is arranged in the low-temperature catalytic desorption tower, and an absorbent liquid outlet is formed in the tower bottom of the low-temperature catalytic desorption tower; the high-temperature thermal desorption tower is connected with the low-temperature catalytic desorption tower in series, a common filler layer without catalytic action is arranged in the high-temperature thermal desorption tower, and an absorbent liquid inlet is formed in the top of the high-temperature thermal desorption tower; an absorbent liquid outlet of the low-temperature catalytic desorption tower is communicated with an absorbent liquid inlet of the high-temperature thermal desorption tower through a pipeline, and the low-temperature catalytic desorption tower is used for conveying the absorbent subjected to low-temperature catalytic desorption to the high-temperature thermal desorption tower for high-temperature thermal desorption. According to the carbon dioxide absorbent pregnant solution double-tower cascade catalytic desorption system, the desorption temperature can be reduced, and the cyclic loading capacity of the absorbent can be ensured.

The utility model provides an oil base rock debris thermal desorption device in the technical field of oil drilling oil base rock debris treatment, which comprises a barrel, a feed port, a discharge port and a gas outlet are arranged on the barrel, a vibration component is arranged on the feed port and comprises a vibration plate, a limit rod, a baffle, a connecting plate, a second motor and a cam, the limit rod is connected with the vibration plate, and the baffle is connected with the connecting plate. The limiting rod penetrates through a through hole formed in a side plate of the feeding port, the end, away from the vibration plate, of the limiting rod is connected with a baffle, a connecting plate is arranged on the baffle, the second motor is arranged on the side wall of the feeding port, the output end of the second motor is connected with a cam, and the cam abuts against the connecting plate. The vibrating assembly is arranged at the feeding port, the motor drives the cam to rotate, the vibrating plate connected with the connecting plate vibrates, it is ensured that materials enter the barrel smoothly, and accumulation and unsmooth feeding are avoided; the limiting rod penetrates through the through hole in the side plate of the feeding port, the effective vibration range of the vibration plate is guaranteed, it is guaranteed that materials accurately enter the barrel, and the overall working efficiency is improved.

Provided are heat sink particles and nonaqueous electrolyte rechargeable batteries, the heat sink particles being at least partially modified metal hydroxide particles, wherein the amount of CH4 desorbed from about 80°C to about 1400°C by thermal desorption gas phase mass spectrometry (TDS-MS) is greater than or equal to about 15 x 10 ‑6 mol / g and less than or equal to about 3000 x 10 ‑6 mol / g, the amount of CH3OH desorbed from about 80°C to about 1400°C is greater than or equal to about 15 x 10 ‑6 mol / g and less than or equal to about 6000 x 10 ‑6 mol / g, the amount of H2O desorbed from about 80°C to about 200°C is greater than or equal to about 30 x 10 ‑6 mol / g and less than or equal to about 1500 x 10 ‑6 mol / g, and both the specific surface area calculated by the adsorption isotherm measured by adsorption of water vapor and the specific surface area calculated by adsorption of nitrogen to the metal hydroxide particles are greater than or equal to about 8 m 2 / g and less than or equal to about 600 m 2 / g.

The application provides an aerosol thermal desorption ion source, which comprises a flash evaporator for receiving a particle beam transmitted along a first direction and heating and vaporizing particles in the particle beam to generate gas molecules; and a filament for releasing electrons to ionize the gas molecules to generate ions; the flash evaporator has a length along the first direction, a width along a second direction, and a thickness along a third direction; the first direction, the second direction and the third direction intersect each other; in the first direction, a cross section of the flash evaporator perpendicular to the first direction is rectangular; in the second direction, the width of the flash evaporator is smaller than the irradiation range of the filament; and in the third direction, the filament is arranged on both sides of the flash evaporator; by using the device, the shape of the gas flow generated by the flash evaporator can be changed, the coincidence degree of the distribution area of the gas and the transmission area of the directional electron beam is improved, and the ionization efficiency of the gas molecules is improved.

The application belongs to the technical field of soil pollutant remediation, in particular to a device for efficiently degrading high-concentration petroleum hydrocarbon in soil, which comprises a feeding module, a conveying module and a thermal desorption module, the conveying module is arranged below the feeding module, the feeding module and the thermal desorption module are connected through the conveying module, together forming a petroleum hydrocarbon degradation device, and the device further comprises a motor and a bracket, the bracket is installed on the surface of the feeding module, a rotating shaft is rotatably connected to the surface of the bracket, and the rotating shaft is driven by the motor; the impurities in the soil can be picked out through the cooperation of the picking rod and the comb plate, so as to avoid the situation that the soil is wrapped in plastic bags, which leads to the reduction of degradation efficiency and the adhesion of the soil to the cylinder wall of the thermal desorption cylinder, and the soil with plastic bags is inconvenient to clean in the later period, the degradation efficiency is improved, and the soil with plastic bags can also avoid causing environmental pollution after backfilling.

The present application relates to atmospheric pressure ion manipulation technology, specifically, the present application discloses a thermal desorption ionization reaction device, specifically, a thermal desorption ionization reaction device, comprising a stainless steel metal desorption ionization cavity, the metal desorption ionization cavity is a hollow circular cylinder with an open upper end and a closed lower end, an insulating cover for sealing the open upper end is arranged on the open upper end, and a gas and ion outlet is arranged in the middle of the insulating cover; the counter electrode and the electrode with holes are connected to the high-voltage output end of the high-voltage power supply and the ground electrode (or negative electrode) respectively. The voltage applied to the counter electrode and the electrode with holes is alternating current or direct current, and the voltage amplitude is 2000V. The present application improves the consistency and stability of batch production of thermal desorption ionization modules based on integrated design, reduces power consumption and processing cost, and is beneficial to the industrialization of mass spectrometry or ion mobility spectrometry.

The invention belongs to the technical field of resource recycling, and particularly relates to a method for recovering Mn and Zn from dust of a bag-type dust collector after thermal desorption of soil. The method for recovering Mn and Zn comprises the following steps: removing Ni and Fe in dust by adopting a magnetic suction method to obtain dust subjected to magnetic suction; mixing the dust subjected to magnetic attraction with alkali liquor to carry out first reaction and first solid-liquid separation to obtain solid subjected to alkali washing; the pH value of the alkali liquor is 12-14; mixing the alkali-washed solid with an acid solution to carry out a second reaction, and carrying out second solid-liquid separation to obtain a solution containing Mn and Zn; and the pH value of the system after the alkali-washed solid and the acid liquor are mixed is 4.5-6.5. According to the method, heavy metals Mn and Zn in the dust are recycled by adjusting the pH value according to the leaching characteristic of the heavy metals in the dust, operation is easy, the Mn and Zn recycling rate is high, high-value and efficient resource utilization of solid waste is achieved, and meanwhile the problem that an existing dust treatment method easily affects the surrounding environment is solved.

The utility model discloses a thermal desorption multi-layer cylinder rotary kiln reactor for rapid restoration of site pollution, which comprises a rotary cylinder, a plurality of layers of inner cylinders are arranged in the rotary cylinder, the layers of inner cylinders are arranged in a mutually sleeved manner from inside to outside along the axial direction, the diameters of the layers of inner cylinders are gradually increased from inside to outside, and the diameters of the layers of inner cylinders are gradually increased from inside to outside. The interior of the rotary barrel is divided into a plurality of annular cavities by the multiple layers of inner barrels, sieve pores are formed in the side walls of the inner barrels, and the sieve pores in the inner barrel on the inner side are larger than the sieve pores in the inner barrel on the outer side; and a side wall cavity heat source input structure is arranged in the rotary cylinder and forms multi-point surrounding type heat source input corresponding to the annular cavity in the rotary cylinder. By arranging the multi-layer rotary cylinder structure and combining the pore size distribution of the screen, the polluted soil is subjected to heat transfer according to particle sizes in the rotary kiln, and compared with a conventional rotary kiln, under the condition that the cylinder length, the cylinder diameter and the cylinder inclination angle are the same, the rotary kiln can improve the complete reaction degree of materials or improve the treatment efficiency by about 50%.