30results about How to "Solving Recycling Problems" patented technology

The invention relates to an ethanol upgrading device and method, the device is used for upgrading ethanol containing a small amount of ethyl acetate, the device comprises a low-pressure rectification unit, a pumping unit and a high-pressure rectification unit which are connected in sequence, a variable-pressure rectification principle is adopted, azeotrope composition is changed only through a variable-pressure mode, reasonable process parameters are matched, and the quality of ethanol is improved. The purified ethanol is extracted from the low-pressure rectification unit, and the ethanol with higher ethyl acetate content is extracted from the high-pressure rectification unit, so that a large amount of ethanol is prevented from being evaporated to the high-pressure rectification unit, the energy consumption is obviously reduced, the production cost is reduced, and the economic benefit is improved.

The utility model relates to the field of ferrous metallurgy, and discloses a quick lime digestion steam recovery processing system based on three-stage purification, which comprises a digester, a water outlet end of the digester is fixedly connected with a pipeline water curtain dust remover, and a smoke outlet end of the pipeline water curtain dust remover is fixedly connected with a spray tower. The waste water end of the pipeline water curtain dust removal is fixedly connected to the water inlet end of the digester, the smoke outlet end of the spray tower is fixedly connected with a wet electric dust removal device, the smoke outlet end of the wet electric dust removal device is fixedly connected with a dust removal fan, the smoke outlet end of the dust removal fan is fixedly connected with a chimney, and the feeding end of the pipeline water curtain dust removal device is provided with a conveying assembly. According to the utility model, the digester, the belt conveyor, the pipeline water curtain dust remover, the spray tower, the wet electric dust remover, the dust removal fan and the chimney are matched with one another, so that quick lime and water are digested in the digester to generate water vapor, the water vapor is discharged into the atmosphere through three-stage purification, and the problem of recycling the water vapor containing calcium oxide and calcium hydroxide is solved.

The invention provides a synthesis method of 1-amino-2-cyano-1-cyclopentene, which comprises the following steps: 1, mixing an ionic liquid and a super-strong organic alkali in a protective gas atmosphere, heating, stirring, uniformly mixing and dissolving to obtain a material A; the ionic liquid is selected from at least one of [BMIM] PF6, [BMIM] BF4, [BMIM] NTf2, [BMIM] OTf and [BMIM] OAc; 2, adiponitrile is dropwise added into the material A under stirring for a reaction, and a material B rich in 1-amino-2-cyano-1-cyclopentene is obtained; 3, cooling and crystallizing the material B, and carrying out pressure filtration to obtain an ACCP crude product; and 4, recrystallizing and refining the obtained ACCP crude product to obtain a pure product. The method provided by the invention has the advantages of simplicity, high efficiency, sustainable production, low cost, low content of generated three wastes, mild reaction conditions and suitability for industrial production.

The invention discloses a low-creep high-alumina brick based on electric melting a-beta corundum brick waste and a preparation method thereof, and belongs to the technical field of high-alumina bricks. The low-creep high-alumina brick comprises the following raw material components in percentage by mass: 20-30% of electric melting a-beta corundum brick waste with the particle size of 0-3.5 mm; 20 to 30 percent of 85 bauxite particles; 10-20% of fine andalusite powder; 10%-20% of sillimanite fine powder; 0-15% of fused corundum fine powder; 0-15% of Guangxi white mud powder; and 2-5% of an additive which is externally doped. The obtained low-creep high-alumina brick is good in microstructure, stable in product quality, high in compression strength, good in thermal shock performance and low in creep rate and is far superior to similar high-alumina bricks, the performance of the low-creep high-alumina brick is greatly improved, and the low-creep high-alumina brick has important application prospects.

The invention relates to the technical field of metal preparation. The invention provides a preparation method of metal copper. The preparation method comprises the following steps: S1, preparing a copper oxide thin film; s2, preparing a metal aluminum film on the surface of at least one side of the copper oxide thin film; and S3, the thin film containing the copper oxide thin film and the metal aluminum film is placed in an alkaline solution to be soaked, and metal copper is obtained. The method can be used for preparing the metal copper at room temperature, and is simple and convenient.

The invention discloses a heat recovery method and device of a heat supply system, a storage medium and an electronic device. The method comprises the steps that a first temperature value of circulating water in the heat supply system after passing through a primary heat supply network heat exchanger is obtained; under the condition that the first temperature value is larger than the preset temperature value of the cold user or the air source heat exchanger, secondary heat exchange treatment is conducted on the circulating water, circulating water of a second temperature value is obtained, and the first temperature value is larger than the second temperature value; and the circulating water with the second temperature value is conveyed to a waste steam heat recovery heat exchanger for heat recovery. By the adoption of the technical scheme, the problem that heat of circulating water in the heat supply system cannot be effectively recycled and utilized is solved. Furthermore, by adjusting the temperature of the circulating water in the heat supply system and recycling the heat exceeding the demand in the circulating water, the waste steam heat recovery efficiency and the overall energy utilization efficiency are improved.

A fluctuating steam thermal storage and heat exchange device and method are disclosed. The device includes a tank, a heat exchanger, and a spraying device. The spraying device is located in the upper part of the tank, and the heat exchanger is located in the lower part of the tank. The bottom of the tank is connected to the spraying device via an upper pipe section through an upper circulation inlet, and to the middle of the tank via a lower pipe section through a lower circulation inlet. A circulating water pump is installed on the lifting pipe. A steam inlet is provided on the tank between the spraying device and the lower circulation inlet. This invention also provides a thermal storage and heat exchange method based on this fluctuating steam thermal storage and heat exchange device. This invention can solve the problem of recovering and utilizing intermittent polluted steam, and produces clean, high-temperature secondary water that can be used for power generation or winter heating.

The utility model discloses a kind of circulation stationary machines, including, rack, is equipped with stationary bin, disassembly tray bin and empty tray bin;Handling mechanism, be in rack, for handling tray;Driving mechanism, be in rack, driving mechanism drives handling mechanism to be connected between external and the stationary bin, between the stationary bin and disassembly tray bin and between the empty tray bin and external;And;Disassembly tray blanking mechanism, be in rack, and be connected between disassembly tray bin and empty tray bin and between disassembly tray bin and blanking area.Through driving mechanism drives handling mechanism to be connected between external and the stationary bin, between the stationary bin and disassembly tray bin and between the empty tray bin and external, realize handling mechanism multidirectional movement, realize from external tray stationary, after stationary, disassembly tray, after disassembly tray, empty tray, and workpiece is automatically transported to next process from blanking area, entire machine realizes full automation, this machine saves manual work, improves efficiency.

The utility model discloses oil gas recovery equipment, which relates to the technical field of oil gas recovery and comprises a bottom plate, an oil storage tank is mounted at the upper end of the bottom plate and is of a cavity structure, a round hole is formed in the middle of the upper end of the oil storage tank, an oil inlet hole is formed in one side of the upper end of the oil storage tank, and an oil inlet pipe is sleeved on the inner side of the oil inlet hole. An adjusting switch is installed at the upper end of the oil inlet valve, an oil outlet is formed in one side of the lower end of the oil storage tank, the oil outlet is connected with an oil outlet adjusting valve, and the oil outlet adjusting valve is connected to the inner side of the oil outlet in a sleeved mode; through the rotating shaft and the fixing rod in the middle of the oil gas recovery cavity, oil gas in the cavity can be conveniently stirred, the oil gas recovery efficiency is improved, the oil gas stirring function can be achieved, oil gas can be conveniently absorbed and filtered through the adsorption plate on the circular filter barrel, the oil gas filtering stability is improved, and the oil gas recovery efficiency is improved. Therefore, the function of filtering and absorbing oil gas can be realized, and the problem of oil gas recovery is finally solved.

The invention discloses a method for regenerating an H-shaped vertical-axis breeze generator blade from a waste wind power blade, and relates to the field of resource recycling, the H-shaped vertical-axis breeze generator blade is manufactured by cutting a formed section of the waste wind power blade, and an epoxy resin glass fiber reinforced plastic sandwich panel of the waste wind power blade has the characteristics of light weight, high strength and corrosion resistance; the glass fiber reinforced plastic sandwich plate of the waste wind power blade is used for replacing aluminum alloy to produce the H-shaped vertical-axis breeze generator blade, so that the waste wind power blade is recycled, the weight of the H-shaped vertical-axis breeze generator blade is reduced under the condition that the strength of the H-shaped vertical-axis breeze generator blade is guaranteed, loads of a supporting structure and a transmission system are reduced, and the service life of the H-shaped vertical-axis breeze generator blade is prolonged. The blades of the H-shaped vertical-axis breeze generator are easier to start and accelerate at a lower wind speed, so that the blades can operate in a wider wind speed range; the wind energy capturing efficiency is improved, and the waste wind power blade obtains the second life, so that the cyclic utilization of resources is realized, and the sustainable development is promoted.

The application discloses a solution containing natural macromolecule and a coagulation molding method. The fiber stream obtained by wet spinning of the solution containing natural macromolecule is coagulated and molded through at least one coagulation bath. The solution containing natural macromolecule contains metal hydroxide and an additive selected from at least one of urea, zinc oxide and thiourea. Bicarbonate or bisulfite or a combination of bicarbonate and carbonate or a combination of bisulfite and sulfite is used as a component of the coagulation bath. The low-cost, green, efficient, non-toxic, harmless and inexpensive inorganic salt solution does not contain strong acid and organic solvent, and can be used to prepare long fibers with circular cross section and excellent mechanical properties. The long fibers have smooth surface, softness and luster. In the coagulation bath, the bicarbonate and carbonate or the bisulfite and sulfite can be easily separated and recovered.

The present invention provides a method for repairing and regenerating waste lithium iron phosphate positive electrode materials, comprising the steps of: crushing and disassembling waste lithium iron phosphate batteries after discharge treatment, separating lithium iron phosphate positive electrode sheets, and then heat treating them in an inert atmosphere to separate the positive electrode sheets from the current collector to obtain waste lithium iron phosphate positive electrode black powder, and heat treating them again in an environment furnace with an oxygen content higher than 50%, removing impurities to obtain oxidized lithium iron phosphate red powder; after replenishing the lithium source, ball milling and mixing the oxidized lithium iron phosphate red powder with the lithium source, placing them in a reducing atmosphere furnace, passing an inert gas with carbonizable small molecular organic matter, and obtaining regenerated lithium iron phosphate positive electrode materials after heat treatment. The above positive electrode material is used to prepare lithium iron phosphate batteries. Since the surface of lithium iron phosphate particles is coated with carbonaceous materials, the conductivity and rate performance of the lithium iron phosphate battery can be effectively improved. The 0.1C gram capacity of lithium iron phosphate reaches more than 155mAh / g, and after 1000 cycles of charge and discharge cycles, the capacity retention rate is higher than 90%.

This invention discloses a method for preparing a composite polyanionic sodium-ion battery cathode material, relating to the field of sodium-ion battery cathode material technology, including the following steps: S1, preparing in-situ doped ferrous sulfate; S2, preparing a graphene-based dispersion; S3, preparing a modified ferrous sulfate solution; S4, preparing an NFPP precursor; S5, preparing an NFPP cathode material. This invention uses stainless steel pickling waste liquid as raw material, first reducing it by adding elemental iron, then dispersing it in a graphene-based dispersion containing tannic acid to obtain carbon-coated modified ferrous sulfate; preparing the NFPP precursor by co-precipitation; and finally sintering to obtain a composite polyanionic sodium-ion battery cathode material with high compaction density and better electrochemical performance, thus improving the problems of poor conductivity, low compaction, low capacity, low rate capability, and high cost of existing NFPP cathode materials.

The present invention provides a regenerated lithium iron phosphate positive electrode sheet, comprising: 70-90% of recycled waste lithium iron phosphate positive electrode material, 3-15% of lithium supplement additive, 3-10% of fast ion conductor, and 3-5% of binder; wherein the recycled waste lithium iron phosphate positive electrode material is obtained by discharging the retired power battery until the voltage is reduced to below 0.5V, crushing the disassembled and separated positive electrode sheet by physical method, adding it to a NaOH solution with a pH of 10-14, stirring, centrifugal treatment, water washing, and drying. The present invention also provides a lithium iron phosphate battery, which is obtained by pre-fabricating a lithium iron phosphate battery using the regenerated lithium iron phosphate positive electrode sheet, and then undergoing a pre-cycle repair treatment to obtain a repaired and regenerated lithium iron phosphate battery. The present invention solves the problem of recycling lithium iron phosphate positive electrode materials in power batteries, while reducing the manufacturing cost of lithium iron phosphate batteries, reliably guarantees the electrochemical performance of lithium iron phosphate batteries, and can meet the requirements of commercial energy storage lithium batteries.

The pushed slab kiln energy-saving waste heat hot air drying device comprises a pushed slab kiln body, a dust removal mechanism, a purification device and a drying box, a waste gas opening is formed in one end of the pushed slab kiln body and connected with a waste gas pipe, the waste gas pipe is connected with the dust removal mechanism, and an exhaust pipe is arranged on the side, away from the waste gas pipe, of the dust removal mechanism. The exhaust pipe is connected with a first heat exchanger, the purification device comprises a purification box and a catalytic bed, the purification box is sequentially provided with a first air inlet, the catalytic bed and a first air outlet from left to right, the outlet end of the first heat exchanger is communicated with the purification box through a pipeline, the first air outlet is connected with an air supply pipe, and the air outlet end of the air supply pipe is connected with a second heat exchanger. The air outlet end of the second heat exchanger is connected with an exhaust fan through a pipeline, the output end of the exhaust fan is connected with a connecting pipe, and the connecting pipe is communicated with the drying box. Through the design, waste heat waste gas in the pushed slab kiln can be recycled to dry materials, resources are saved, energy consumption is reduced, and energy conservation and emission reduction are achieved.

The invention provides a method for recovering polyester through high-efficiency selective alcoholysis of an alcohol amine compound, aiming at the problems existing in the prior art for recovering polyester from the alcohol amine compound. According to the method, by combining factors such as an amino protection strategy and a solvent effect, selective alcoholysis of the alcohol amine compound on the polyester is realized, so that when the alcohol amine compound is used for degrading and recycling the polyester, the energy consumption in a separation process can be reduced in a degradation process, the recovery rate and the purity of an alcoholysis product are improved, and moreover, the production cost is reduced. The alcoholysis product obtained by the method provided by the invention also contains amino groups and ester groups, and can be used as a high-value chemical raw material for synthesizing high-performance polymers or fine chemicals and realizing upgraded recovery of polyester, so that environmental protection and resource recycling can be greatly promoted undoubtedly, and development and popularization of circular economy are promoted.

The utility model discloses a kind of linear cutting filter screen, including first mounting bracket, second mounting bracket and filter pad, the first mounting bracket right side is equipped with the second mounting bracket of symmetrical structure, and first mounting bracket and second mounting bracket structure are same, and the both ends of first mounting bracket and second mounting bracket outside are welded with connecting lug. The utility model filters the size of notch to carry out the size of filter pad, then the both ends of filter pad are respectively installed in the mounting groove of first mounting bracket, second mounting bracket inner end, and fixed by screw, increase firmness, then filter pad is laid in the notch of filtering, and first mounting bracket and second mounting bracket are fixed by fixed bolt, filter pad is attached to the notch of filtering, solve the cutting chip with cutting fluid flow to cutting fluid recovery pipe, jam in the elbow place inside pipeline, seriously affect the problem of cutting fluid recovery, improve the recycling rate of cutting fluid.

The invention belongs to the technical field of environmental engineering, and particularly relates to an MOFs-loaded polymer composite material as well as a preparation method and application thereof. The preparation method of the MOFs-loaded polymer composite material comprises the following steps: freezing and crushing a polymer material, then adding an MOFs material, carrying out melt blending, enabling the MOFs material to be loaded on the surface of the polymer material, cooling, and separating to obtain the MOFs-loaded polymer material. The graded porous MOFs-loaded polymer composite material is rapidly and simply prepared in batches by taking waste plastic in household garbage as a raw material, combining a freezing crushing process and a melt blending process and utilizing the difference of surface and interface properties generated by different temperature differences and different materials and the rule of oxygen concentration distribution; the potential of the MOFs for realizing large-scale water treatment application is further improved.

The application discloses a cable and wire stripping machine, which comprises an operation table, traction devices, an outer shell, a stripping knife group, wherein the traction devices are provided in two groups, the first group of traction devices is used for traction of unstripped cables, the second group of traction devices is used for traction of conductors, the first group of traction devices and the second group of traction devices are arranged on the operation table, the outer shell is arranged on the operation table and located between the first group of traction devices and the second group of traction devices, the stripping knife group comprises a supporting structure, a first knife group and a second knife group, the supporting structure is arranged in the outer shell and close to one side of the first group of traction devices, the first knife group is rotatably arranged in the middle of the outer shell, the cutter of the first knife group is clamped into the gap between steel wires of the cable and rotates when the cable advances, and the second knife group is suspended in the outer shell and close to one side of the second group of traction devices, and the second knife group cuts the sheath, so that the application has the advantages of simple structure and convenient use.

The application provides a process for recycling aramid spinning flush material, and belongs to the technical field of high-risk solid waste recycling, and aims to solve the technical problem that PPTA resin is easy to degrade during neutralization and washing recovery.The recycling process comprises the following steps: (1) collecting aramid spinning flush material lumps and cooling at low temperature; (2) soaking the cooled flush material lumps in ice water / ice slurry, replacing the ice water / ice slurry for multiple times until the leaching liquid is weakly acidic and stable; crushing the flush material lumps; (3) soaking the crushed flush material lumps in weakly alkaline ice water / ice slurry to neutralize residual acid, and then crushing the flush material lumps again by using a crushing device, and washing, drying and obtaining recycled PPTA resin particles.The application realizes harmless treatment and resource utilization of the aramid spinning flush material containing a large amount of sulfuric acid and aramid resin generated during aramid spinning, improves economic benefits and reduces environmental pollution.

The present invention belongs to the technical field of reservoir safety detection, and provides a system and method for monitoring the seepage channel of a reservoir rockfill dam using microseismic signals. The system includes a fixing device, a signal acquisition device, and a cloud data analysis system; the fixing device is used to install the signal acquisition device on the dam body; the signal acquisition device is used to collect microseismic signals of rockfill material rupture, and send the microseismic signals to the cloud data analysis system; the cloud data analysis system is used to obtain whether the rockfill dam body is ruptured based on the received microseismic signals and the information vector machine model for identifying the type of rockfill dam rupture; based on the received microseismic signals and the spatial distribution map of the source position, the distribution of the source position in the spatial distribution map of the source position is analyzed to determine whether there is a potential seepage channel in the local area. The present invention can track the rupture of rockfill materials and its evolution process caused by seepage inside the rockfill dam body of the upper reservoir of the pumped storage power station.

The present invention discloses a refining and recovery process of a mixed waste liquid containing hydroxyethylpiperazine and hydroxyethylethylenediamine, firstly collects a stripping liquid waste liquid containing N-hydroxyethylpiperazine and hydroxyethylethylenediamine, adds an ether organic solvent as an extractant to the stripping liquid waste liquid and mixes it evenly, shakes and extracts it, and then stratifies it; after stratifying it, the N-hydroxyethylpiperazine-ether solution located on the upper layer and the hydroxyethylethylenediamine located on the lower layer are separated and respectively sent to a distillation tower for vacuum distillation, thereby respectively obtaining N-hydroxyethylpiperazine and hydroxyethylethylenediamine with a purity greater than 99%. Hydroxyethylpiperazine and hydroxyethylethylenediamine with similar boiling points in the stripping liquid waste liquid can be separated by the method provided by the present invention to obtain high-purity electronic chemicals.

This invention belongs to the field of polyolefin recycling technology and relates to a method for preparing high-quality carbon nanotubes by catalytic carbonization of polyolefins. In this invention, polyolefins are degraded at high temperature to generate small-molecule hydrocarbons. Subsequently, a Ni-Mo-Al catalyst undergoes a reduction reaction to generate elemental nickel. The elemental nickel catalyzes the degradation products to undergo dehydrogenation, cyclization, and aromatization reactions, followed by carbon deposition on the surface of the elemental nickel, which gradually grows into carbon nanotubes. Furthermore, the Ni-Mo-Al catalyst can reduce the formation of amorphous carbon, thereby increasing the activity of elemental nickel and reducing its ability to dissolve carbon, thus preparing carbon nanotubes with smaller diameters and uniform morphology. This invention has the advantages of inexpensive and readily available carbon sources and a simple preparation method, realizing the upgraded chemical recycling of waste polyolefins and the controllable preparation of carbon nanotubes, effectively solving the problem of reusing urban and industrial waste polyolefins.

The application relates to the field of high-voltage switch devices of power systems, and discloses a through-wall connecting piece of a new material, a side-out bus sleeve assembly comprising a bus sleeve and a center insert fixed in a center hole, a plurality of interval distributed umbrella skirts extending on the outer circumferential surface of the bus sleeve in the axial direction of the bus sleeve, a first flange and a second flange fixedly connected outside the connecting end of the bus sleeve, and the bus sleeve, the umbrella skirts, the first flange and the second flange being integrally cast by thermoplastic engineering plastics. In the production process of the device, the bus sleeve, the umbrella skirts, the first flange and the second flange, the inserted connecting insert and the center insert are integrally cast by thermoplastic engineering plastics, the thermoplastic engineering plastics is used to replace epoxy resin, the insulation function of the product is realized, the recycling problem is solved, and the stability and the service life of the device can be improved through the integrated casting and the setting of the annular clamping groove of the center insert and the annular clamping protrusion of the center hole.

The invention relates to a method for preparing para-aramid fibrid through a dissolution method. The method provided by the invention comprises the following steps: (1) dissolving: dissolving poly (p-phenylene terephthamide) (PPTA) in a composite solvent to obtain a poly (p-phenylene terephthamide) solution; and (2) fiber forming: adding the poly-p-phenylene terephthamide solution obtained in the step (1) into a coagulating bath, and stirring to obtain the para-aramid fibrid dispersion liquid. The method disclosed by the invention is simple in process, low in cost, low in equipment requirement, low in implementation difficulty and capable of obtaining the para-aramid fibrid with excellent performance. Moreover, according to the method disclosed by the invention, the waste material generated in the production process of the para-aramid fiber and / or the recovered para-aramid fiber product can be used as the raw material, so that the production cost is low, and the method is environment-friendly.

The invention relates to the technical field of corrosion inhibitors, and discloses a biomass carbon quantum dot corrosion inhibitor and a preparation method and application thereof.The preparation method of the biomass carbon quantum dot corrosion inhibitor comprises the steps that smashed orange peel powder is added into deionized water and stirred to be uniform; transferring the solution into a polytetrafluoroethylene reaction kettle, heating in a drying oven, cooling to room temperature after the reaction is finished, taking out the reaction kettle, filtering the solution by using a microporous filter membrane to remove unreacted substances, and purifying and dialyzing the solution by using a dialysis bag to obtain a yellowish-brown solution. And finally, pre-freezing the solution, freezing and drying in vacuum to obtain the final product BCQDs corrosion inhibitor. The biomass orange peel can be used as a carbon source, a nitrogen source, a sulfur source and a phosphorus source at the same time, and doping of various heteroatoms to the carbon quantum dots can be realized without adding other reagents. The prepared BCQDs corrosion inhibitor has the advantages of being environmentally friendly, efficient, easy to prepare, low in cost and wide in raw material source.

The present invention discloses a multifunctional circulating cleaning system for bidirectional cleaning of parts to be cleaned, comprising: an air source, a first gas-liquid separator and a second gas-liquid separator for storing cleaning agents, a first exhaust pipeline, a second exhaust pipeline, a pressure detection device, and a plurality of pipelines connecting the above components, and electromagnetic valves and controllers arranged on the pipelines. The present invention uses an air source as a power source, cooperates with a plurality of pipelines and electromagnetic valves to realize a reciprocating circulation type automatic cleaning process, is simple to operate, can clean thoroughly, and can also perform batch cleaning work, thereby solving the problem of recycling cleaning agents, effectively reducing cleaning costs, and truly realizing cleaning without liquid residue.

The utility model provides a system of waste heat power plant cooling tower top steam water recovery is carried out with the application of ground source heat pump, the system includes shallow ground heat energy heat extraction system, ground source heat pump system and cooling tower top steam water recovery system, shallow ground heat energy heat extraction system's output end is connected ground source heat pump system, and the output end of ground source heat pump system is connected cooling tower top steam water recovery system, the utility model will ground heat energy into cold energy, carries out condensation to the steam of cooling tower dissipation, can recover water resources.

The utility model relates to the technical field of tables and chairs, and discloses a folding auditorium chair device which comprises a supporting seat and a back cushion arranged at the upper end of the supporting seat, a seat cushion is arranged at the middle end of the supporting seat, an adjusting assembly is arranged in an inner cavity of the supporting seat, the upper end of the adjusting assembly is connected with an unfolding assembly, and the unfolding assembly is connected with the supporting seat. The adjusting assembly comprises a first driving wheel arranged at the joint of the cushion and the supporting seat, and the outer wall of the first driving wheel is connected with a first transmission wheel through a first transmission belt. The writing board in the arm seat is slowly unfolded from the inside so that the conference personnel can write conveniently, in addition, after the conference personnel leave the seat, the writing board is automatically recycled, and the problem that the conference personnel need to manually recycle the writing board is solved.

The utility model provides a device for preparing calcium phosphate by recycling waste phosphoric acid in electronic industry, which comprises a primary reaction tank, a cooling unit, a secondary reaction tank, a high-pressure filter pressing unit and a drying unit, an outlet of the primary reaction tank is connected with an inlet of the cooling unit, an outlet of the cooling unit is connected with an inlet of the secondary reaction tank, and an outlet of the high-pressure filter pressing unit is connected with an outlet of the drying unit. An outlet of the secondary reaction tank is connected with an inlet of the high-pressure filter-pressing unit, an outlet of the high-pressure filter-pressing unit is connected with an inlet of the drying unit, the drying unit is connected with an external steam source, and the drying unit is provided with a discharge port. The utility model solves the problem of how to efficiently convert waste phosphoric acid into active calcium phosphate in the prior art.