34results about How to "Reduce subsequent processing costs" patented technology

The present invention provides a preparation method of 4,6-dihydroxypyrimidine, and the preparation method comprises the following steps: adding a mixed solution of malonate and formamide to an alkali metal alcoholate / solvent containing a catalyst, and then keeping the mixture warm for reaction after the addition is completed. After the reaction is completed, the solvent is evaporated to dryness, and after being dissolved in water, the mixture is acidified to a pH of 2-3, filtered, washed with water, and dried to obtain 4,6-dihydroxypyrimidine. The present invention utilizes a catalyst to catalyze the reaction, thereby improving the reaction yield, having a high atomic economy, and reducing the amount of raw materials used, reducing the generation of saline wastewater, and alleviating environmental pressure.

The invention relates to a water-soluble waste gas recovery treatment device and method.The recovery treatment device comprises a packed tower, and the packed tower sequentially comprises a gas inlet space, an unmodified metal wire mesh packing layer, a gas-liquid distributor, a modified metal wire mesh packing layer, a liquid distributor and a first exhaust port from bottom to top; the hydrophilicity of the modified metal wire mesh filler layer is greater than that of the unmodified metal wire mesh filler layer; one end of the solution circulating pump is communicated with the gas inlet space, and the other end of the solution circulating pump is communicated with the gas-liquid distributor; the pure water input pipeline is communicated with the liquid distributor; a first valve is arranged on the pure water input pipeline; one end of the pure water circulating pump is communicated with the gas-liquid distributor, and the other end of the pure water circulating pump is communicated with the liquid distributor; a second valve is arranged between the pure water circulating pump and the gas-liquid distributor; and a third valve is arranged on the upper-layer material discharge pipeline. The concentration of the organic solvent in the final discharged gas can be reduced, the concentration of the recovered solution is improved, the environmental protection property is high, the energy-saving effect is good, and the subsequent treatment cost is reduced.

The invention provides a sintered brick containing iron ore tailing mud and a preparation method of the sintered brick. The sintered brick comprises the following components in parts by weight: 50-70 parts of iron ore tailing mud, 10-15 parts of concrete mixing plant sludge, 10-15 parts of coal gangue, 6-10 parts of fly ash, 10-15 parts of akermanite, 5-7 parts of magnesium cordierite and 2-4 parts of an auxiliary agent. The preparation method comprises the following steps: (1) uniformly stirring akermanite and magnesium cordierite, and carrying out hot-pressing treatment to obtain a first hot-pressed mixture; (2) pre-sintering the iron ore tailing mud and the concrete mixing plant sludge to obtain a pre-sintered material; (3) uniformly stirring coal gangue, fly ash, the first hot-pressed mixture and the pre-sintered material, adding water until the water content is 40-50wt%, and aging to obtain a mixture; (4) adding an auxiliary agent into the mixture, uniformly stirring, aging, and carrying out compression molding to obtain a green brick; and (5) drying and firing the green brick to obtain the sintered brick. The prepared sintered brick is high in yield, harmless and resource utilization of the iron ore tailing mud is achieved, and the obtained sintered brick is light in dead weight, high in compressive strength and good in weather resistance.

The invention relates to the technical field of nonferrous metal material manufacturing, in particular to an efficient cost-reducing preparation method of a high-heat-resistance, high-conductivity and high-strength copper-chromium-niobium material, which comprises the following steps: S1, powder screening; s2, electron beam printing, including entity printing, outer contour printing, thermal compensation scanning and heat preservation; the preparation method of the copper-chromium-niobium material is developed on the basis of reducing the cost; the powder with the larger particle size range is used for reducing the raw material cost, the higher layer thickness is used for reducing the printing time cost, thermal compensation scanning of the outer contour is used for optimizing the surface of a part to reduce the subsequent machining cost, thermal compensation heat preservation after printing is completed is used for reducing the cost of subsequent recharging heat treatment, and the heat preservation efficiency is improved. The tensile strength of the prepared blank is larger than 380 Mpa, the hardness is larger than 110 HB, the conductivity is larger than 47 Ms / m, the process is simple and stable, and batch production is easy.

The invention provides a method for improving main components in a cobalt nickel hydroxide intermediate product. The lifting method comprises the following steps: step S100, carrying out first activation on cobalt nickel hydroxide intermediate product slurry by adopting an alkaline substance to obtain first activated product slurry; step S200, adjusting the solid content of the first activated product slurry; s300, activating the first activated product slurry for the second time by adopting a reducing agent to obtain second activated product slurry; step S400, adjusting the solid content of the second activated product slurry; and step S500, adding the second activated product slurry into a nickel-cobalt-containing solution for conversion reaction to obtain nickel cobalt hydroxide and a converted solution. According to the method disclosed by the invention, the total content of nickel and cobalt in cobalt nickel hydroxide can be remarkably increased and reaches a level exceeding 50%. The problems that the content of impurities such as magnesium and manganese in the nickel cobalt hydroxide intermediate product is too high, the content of sulfate radicals is too high, and consequently the subsequent refining production cost is increased are solved.

The invention belongs to the technical field of metal materials and radiation protection, and particularly relates to a preparation method of thermal neutron shielding steel. According to the method, efficient spray forming of the B4C / 304 stainless steel composite material is achieved through a gas-solid two-phase flow driving mechanism under the negative pressure environment, B4C ceramic particles are evenly dispersed and embedded into a 304 stainless steel matrix, and due to the strong driving force of gas-solid two-phase flow, firm interface bonding is formed between the B4C particles and the matrix. According to the process, gas atomization and solid-phase medium particles are combined, a gas-solid two-phase mixed flow is formed, the atomization efficiency is greatly improved, the powder particle size is refined, reinforced phase distribution is optimized, and a new way is opened up for preparation of the high-performance thermal neutron shielding steel composite material.

The invention discloses a method for preparing full-fraction aviation kerosene from synthesis gas, and belongs to the technical field of synthetic fuels, and the method comprises the following steps: S1, decomposing wood and crop residues into synthesis gas through biomass gasification; s2, coupling the cobalt base and the molecular sieve to obtain a first catalyst, inputting the synthesis gas into a first Fischer-Tropsch reactor, and promoting the reaction by the first catalyst to obtain alkane; s3, coupling the composite oxide and the molecular sieve to obtain a second catalyst, inputting the synthesis gas into a second Fischer-Tropsch reactor, and promoting the reaction by the second catalyst to obtain aromatic hydrocarbon; and S4, after heat exchange of the alkane and the aromatic hydrocarbon in the process flow, carrying out isomerization refining and rectification to collect hydrocarbon products, and blending to form petroleum fractions, thereby obtaining the full-fraction aviation kerosene. The invention is rooted on leading-edge exploration of sustainable development energy, and aims to integrate renewable resource technologies such as biomass gasification and green electric driven H2 manufacturing so as to construct a low-carbon and environment-friendly aviation kerosene production system, thereby providing a scientific and feasible technical path for green transformation of the global aviation fuel industry.

The invention discloses a deep and large foundation pit drainage system which comprises a drainage well, a seepage water storage part, a sludge cutting part, a mud-water separation part, a mud collecting part and a mud-water discharge part, a partition plate and a cutting plate are arranged in the seepage water storage part and the sludge cutting part respectively, the diameter of the cutting plate is smaller than that of the drainage well, and the mud-water separation part is arranged in the mud-water separation part. The top of the cutting plate is provided with cutting blades at intervals in the radial direction, the cutting plate and the bottom of the partition plate are each provided with a pair of matched extrusion protrusions so that slurry can pass through a gap between the pair of extrusion protrusions, and the extrusion protrusions on the cutting plate and the cutting blades on the cutting plate are arranged at intervals in the radial direction of the cutting plate. The invention further provides a drainage method based on the deep and large foundation pit drainage system. The mud-water separation efficiency of seepage water of the deep and large foundation pit can be effectively improved, and efficient and stable operation of a drainage system of the deep and large foundation pit is ensured.

The application relates to the field of advanced structural ceramics, and particularly discloses a gel injection molding method for preparing high-performance silicon nitride ceramics and a preparation method thereof. Raw materials include beta-SiN submicron powder 75 parts, YO submicron powder 8 parts, TiC submicron powder 5 parts, AlO superfine powder 5 parts, ZrO submicron powder 2 parts and wollastonite 5 parts in terms of mass ratio, a complex whisker regulator and an entry liquid are used, and ceramics are prepared through gel injection molding, dehydration, degreasing and gas pressure sintering. The grain morphology and interface combination are optimized through the whisker regulator, the slurry dispersion and the green body uniformity are improved through the entry liquid, and the product has a density greater than or equal to 99%, a Vickers hardness greater than or equal to 1700HV and a bending strength greater than or equal to 930MPa through 1700-1850 DEG C. gas pressure sintering, and the product has high density, high hardness, high toughness, wear resistance, corrosion resistance and long service life.

The utility model relates to a system for reducing the amount of regenerated tail gas of wet-type ammonia oxidation multi-stage desulfurization. The system comprises a multi-stage desulfurization system, in each stage of desulfurization system, the top of the regeneration tower is connected with the bottom of the regeneration tower through a regeneration circulating gas pipeline, and the regeneration circulating gas pipeline of each stage of desulfurization system is connected with the regeneration circulating gas pipeline of the next stage of desulfurization system through a corresponding middle tail gas pipeline; the regeneration recycle gas pipeline of the first-stage desulfurization system is additionally connected with a compressed air pipeline, and the regeneration recycle gas pipeline of the last-stage desulfurization system is additionally connected with a tail gas exhaust pipeline; or in each stage of desulfurization system, the regeneration gas pipeline at the top of the regeneration tower is respectively connected with a regeneration gas main pipeline, the regeneration gas main pipeline is respectively connected with the regeneration tower of each stage of desulfurization system through a regeneration circulating gas pipeline, and the regeneration gas main pipeline is additionally connected with a compressed air pipeline and an exhaust tail gas pipeline. According to the utility model, the emission of regenerated tail gas can be greatly reduced, and the follow-up treatment cost of the regenerated tail gas is reduced.

The invention relates to the technical field of twisted copper wire stranding, in particular to a wire stranding device for twisted copper wire production and processing and a use method thereof.The wire stranding device comprises a base, a pay-off reel is arranged at one end of the base, and a plurality of wire wheels distributed in an annular array are arranged on the side face of the pay-off reel; a follow-up sleeve is fixedly installed in the center of the side face of the pay-off reel, and reciprocating threads are arranged at the end, away from the pay-off reel, of the follow-up sleeve. Compared with the prior art, through inclined reciprocating sliding of the bunching sleeve, the cleaning ring on the inner side wall of the bunching sleeve can dynamically and comprehensively clean the outer surface wall of the copper wire, the dynamic cleaning mode can effectively remove dust, greasy dirt and other impurities attached to the surface of the copper wire, the conductivity of the copper wire is improved, and the service life of the copper wire is prolonged. The efficient cleaning mode not only improves the cleanliness and the production quality of the copper wires, but also reduces the subsequent processing cost, and provides powerful guarantee for high-quality production of the stranded copper wires.

This invention discloses a mica nanosheet and its preparation method, belonging to the field of two-dimensional nanofiller technology. The preparation method disclosed in this invention involves heat-treating bulk mica, followed by purification in an aqueous nitric acid solution to obtain pretreated mica powder; dispersing the pretreated mica powder in a solvent to obtain a mixed slurry; adding an oxidant to the mixed slurry and stirring the mixture, then adding a small-molecule lithium salt to further react, obtaining a pretreated slurry; adding grinding beads to the pretreated slurry for sand milling to achieve exfoliation; subsequently releasing the exfoliated slurry and performing post-processing to obtain mica nanosheets. This method solves the technical problem of simultaneously achieving efficient, green, and controllable exfoliation, and possesses scalability potential, which is difficult to achieve with existing methods.

This invention discloses an environmentally friendly construction waste resource recovery device, comprising: a mounting frame, a crushing component at the top of the mounting frame, a dust suppression component on the crushing component, and a discharge box and a water storage tank inside the mounting frame for solid-liquid separation of crushed materials and wastewater, the discharge box and the water storage tank being fixedly connected; in this invention, the pump, inlet pipe, outlet pipe, circulation pipe, spray cylinder, and spray holes of the dust suppression component work together to quickly and evenly spray water mist during the crushing of construction waste, efficiently adsorbing dust, effectively suppressing dust diffusion, avoiding dust pollution of the surrounding environment and harm to the health of operators. Simultaneously, the water used for dust suppression can be purified and recycled through the water storage tank, eliminating the need for additional large amounts of clean water, saving water resources. Furthermore, the spray cylinder is flush with the inner side of the crushing hopper, not affecting material crushing and falling, adapting to the actual needs of crushing operations, and improving the environmental friendliness and practicality of the device.

The invention discloses anaerobic wastewater treatment equipment which comprises an anaerobic tower for treating wastewater through anaerobic fermentation and an external pressure ultrafiltration membrane assembly, and wastewater enters the external pressure ultrafiltration membrane assembly through a second liquid inlet pipe after being subjected to anaerobic fermentation treatment in the anaerobic tower. The external pressure ultrafiltration membrane assembly is used for separating wastewater to divide the wastewater into produced water and concentrated water, the chemical cleaning assembly comprises a chemical cleaning water tank and a chemical cleaning water pipe, the chemical cleaning water pipe is communicated with the interior of the chemical cleaning water tank, and a chemical cleaning agent in the chemical cleaning water tank enters the external pressure ultrafiltration membrane assembly through the chemical cleaning water pipe for chemical cleaning; the anaerobic tower and the external pressure type ultrafiltration membrane are combined, pollutants in the wastewater are removed through anaerobic reaction, then the wastewater is divided into produced water and concentrated water through the external pressure type ultrafiltration membrane, the concentrated water flows back to the anaerobic tower for circular reaction, the produced water is stored in the produced water tank, and the produced water is recycled. Meanwhile, the equipment can be used for carrying out online cleaning on the external pressure type ultrafiltration membrane through the chemical cleaning assembly.

The utility model provides a dry dedusting converter gas waste heat boiler with a water-cooled support frame, which comprises a cylinder body, a heat exchange energy plate and the water-cooled support frame, the heat exchange energy plate is arranged in the cylinder body, extends from the inner wall of the cylinder body to the inner space and is placed in a vertical wall shape, and the water-cooled support frame is arranged in the cylinder body. The water-cooled supporting frame is arranged below the heat exchange energy plate and used for supporting the heat exchange energy plate, the water-cooled supporting frame comprises water-cooled heat exchange pipes, and the water-cooled heat exchange pipes are horizontally distributed below the heat exchange energy plate and make contact with the bottom of the heat exchange energy plate. According to the waste heat boiler, the water-cooled supporting frame is arranged below the heat exchange plate, the frame cannot generate thermal stress fatigue, and the structural stability of the whole waste heat boiler is protected.

The application discloses a method for delivering trace elements to anaerobic fermentation bacteria by coating additives, and the method comprises the following steps: mixing a biomass raw material to be treated and inoculated sludge in a fermentation tank; mixing hydrophobic nanosilica and a metal element ion salt solution, and stirring at a high speed to prepare a slow-release coating additive; adding the prepared slow-release coating additive into the fermentation tank; and setting a fermentation stirring rate to perform anaerobic fermentation. The method can not only gradually release trace metal elements under the action of stirring shear force to improve the biological availability of the trace metal elements, thereby being beneficial to solving the problem that part of the added trace metal element ions is precipitated by other anions in the process of being uptaken by microorganisms, but also can solve the potential heavy metal pollution problem in biogas residue; meanwhile, the method can also solve the biological toxicity problem caused by the prior art, and can effectively promote the anaerobic fermentation biochemical reaction pathway to improve the methane production.

The utility model relates to the technical field of shearing devices, and discloses a pearlescent embossed paper rapid shearing device which comprises an operation table, one side of the top of the operation table is fixedly connected with an installation frame, the top of the operation table is fixedly connected with a fixing frame, the top of the operation table is fixedly connected with a U-shaped frame, and the top of the U-shaped frame is fixedly connected with an air cylinder. The output end of the air cylinder is fixedly connected with a lifting rod, the bottom of the lifting rod is fixedly connected with a cutter, arc-shaped pressing plates are arranged on the two sides of the cutter, a pressing assembly is arranged on the U-shaped frame, and the pressing assembly conducts pressing when paper is cut through the arc-shaped pressing plates. In the cutting process, the edge of the paper is effectively pressed through close fit of the arc-shaped pressing plate and the arc-shaped groove, displacement of the paper during cutting is avoided, the precision of the cutting size is remarkably improved, and the product quality is ensured.

The invention discloses a real-time dioxin management and control intelligent system in the waste incineration process, and relates to the technical field of environmental protection, the system comprises an incinerator, one side of the incinerator is provided with a supporting high frame, the supporting high frame is provided with a fuel barrel, a fuel conveying pipe is connected between the fuel barrel and the incinerator, the back face of the incinerator is provided with an air blowing mechanism, and the front face of the incinerator is provided with an input window; a control cabinet is further arranged on the outer wall of the incinerator, a smoke exhaust pipe is arranged at the top end of the incinerator, an intelligent opening and closing mechanism is arranged on the smoke exhaust pipe, and a reverse jet flow purification mechanism is further arranged on the smoke exhaust pipe; the driving assembly of the reverse jet flow purification mechanism drives the reverse rotation assembly to drive the suction and exhaust assembly and the rotary spraying assembly to rotate, and activated carbon particles ejected by the rotary spraying assembly and dioxin-containing flue gas sucked by the suction and exhaust assembly reversely collide, so that dioxin carried by the flue gas generated in the waste incineration process is efficiently adsorbed on the activated carbon particles; and the subsequent treatment process is carried out, so that the subsequent treatment cost is greatly reduced.

The invention discloses a sulfur-fluorine mixed acid evaporation, concentration and separation system, which comprises a mixed acid separation and concentration device used for heating, concentrating and separating sulfur-fluorine mixed acid, cooling obtained hydrofluoric acid steam to prepare hydrofluoric acid, and conveying obtained low-fluorine sulfuric acid to a sulfuric acid fluorine removal device through a pipeline; the sulfuric acid defluorination device is used for heating and separating low-fluorine sulfuric acid and removing fluorine-containing substances in the low-fluorine sulfuric acid, obtained sulfuric acid is conveyed to the sulfuric acid concentration device through a pipeline, and obtained hydrofluoric acid steam is cooled to prepare hydrofluoric acid; and the sulfuric acid concentration device is used for heating and concentrating sulfuric acid, and the obtained concentrated sulfuric acid is reused in the mixed acid separation and concentration device to obtain production water containing trace sulfuric acid. The invention also discloses a sulfur-fluorine mixed acid evaporation, concentration and separation method. According to the method, high-concentration concentrated sulfuric acid can be obtained from the low-concentration sulfur-fluorine mixed acid in the evaporation and concentration process, and comprehensive utilization of F and S resources is achieved.

This utility model discloses a stop bar structure for a die-casting mold, comprising: a die-casting mold body and a positioning component. Two handles are installed on one side of the die-casting mold body, and two fixing bolts are installed on the other side of the die-casting mold body. A stop bar assembly is provided in the middle of the die-casting mold body. The positioning component is located on top of the stop bar assembly to fix the position of the stop bar assembly. This utility model forms a reliable physical barrier by having the stop bar body fit against the mold closing gap of the die-casting mold, significantly reducing the risk of high-temperature molten metal overflowing from the parting surface under high pressure, reducing the generation of defects such as flash and burrs, improving the surface quality and dimensional accuracy of the casting, and reducing subsequent processing costs. It is more suitable for the production of precision die-casting parts with strict requirements for surface finish. Furthermore, the engaging design of the fastening bolts and positioning holes, combined with the anti-slip structure of the threaded ring, ensures that the stop bar assembly maintains a stable connection under high pressure conditions.

The utility model discloses motor pivot turns around frame, including crossbeam, the top fixedly connected with hard plastic bracket of crossbeam, and the side wall fixedly connected with stand, the top fixed mounting of stand has the tray, and the bottom storage groove retractable is provided with the anti -deflection post, the top recess of stand rotates and is installed with the connecting shaft. The utility model crossbeam top's hard plastic bracket replaces traditional section steel / steel sheet, and its material quality hardness is moderate and smooth surface, can steady support pivot, can also avoid scratch, knock -about caused by pivot surface direct friction, protect pivot processing precision and appearance quality, and hard plastic material quality does not produce wood chip, has solved the pollution problem of " pivot sticks wood chip " in traditional wood strip turnover frame from the root, need not additional cleaning procedure, reduces the follow -up processing cost, and simultaneously, the cooperation of anti -deflection post and tray can carry out lateral and upper and lower limit to pivot, prevents pivot from colliding because of shaking, sliding in the turnover process, further promotes the protection effect.

The invention belongs to the technical field of neodymium-iron-boron waste modification application, and relates to a neodymium-iron-boron waste modification method and application of the neodymium-iron-boron waste modification method in wastewater heavy metal adsorption. And adding the fly ash crude product into water, fully stirring and uniformly mixing, removing upper turbid liquid, and heating and drying the solid to obtain the fly ash FA. The method comprises the following steps: adding Na2FeO4 into fly ash FA, and uniformly mixing to obtain FA / Na2FeO4; the preparation method comprises the following steps: adding FA / Na2FeO4 into a lanthanum chloride solution in a stirring state, carrying out shaking reaction for at least 3 hours, centrifuging after the reaction is finished, and drying and grinding a solid obtained by centrifuging to obtain La / FA / Na2FeO4 powder; compared with a traditional treatment method, the treatment effect is better, the sludge generation amount is small, and the follow-up treatment cost is reduced. According to the technical scheme, various heavy metal ions in wastewater can be effectively removed, the turbidity and chromaticity of a water body are reduced, it is ensured that the water body is free of peculiar smell, and the residual quantity of the heavy metal ions is remarkably reduced.

This utility model relates to the field of dust collector bag technology, specifically a dust collector bag that is easy to connect and fix. It includes a bag body fitted onto a bag frame. The bag body is characterized by a steel wire ring at its top, and multiple sets of rubber strips fixed to the inner wall of the bag body, with grooves on the surface of the rubber strips. The beneficial effect is that by integrally forming a cloth cover around the top of the bag body, and setting steel wire rings on the top and bottom surfaces of the inner wall of the cloth cover, during installation, after fitting the bag body onto the bag frame, pulling downwards causes the cloth cover to fit over the top of the frame. Using pliers, the steel wire rings are twisted through the cloth cover, tightly securing them to the top ring of the bag frame. Simultaneously, the rubber sleeve on the inner ring of the cloth cover increases the friction between it and the top ring of the frame, further strengthening the connection and effectively preventing the bag body from falling off during use, ensuring stable dust collection.

The utility model relates to loading and unloading feeding equipment which comprises a feeding equipment body, the feeding equipment body is provided with a feeding port, a large-block material port and a small-particle material port, and a small-particle screening device is arranged in the feeding equipment body. And large materials and small particle materials obtained by screening the materials entering through the feeding port through the small particle screening device are discharged through the large material port and the small particle port respectively. According to the utility model, after small-particle materials are screened out through the small-particle screening device, large-block materials are discharged through the large-block material opening and are fed, so that the phenomena that dust is too much in subsequent treatment of the materials and invalid treatment of the small-particle materials is too much due to too many small particles in the fed materials can be avoided, and the working environment is improved; and the subsequent treatment cost is reduced.

The application discloses an irregular casting dust fall recovery polishing table, which comprises a polishing table body, a group of transmission grooves arranged in the polishing table body, a flow guide mechanism arranged in the transmission grooves, a separation sieve plate arranged at the top of the transmission grooves, a plurality of separation grooves formed in the separation sieve plate, a liquid inlet groove formed in the polishing table body and movably provided with a suspension shaft, and the suspension shaft is in abutment with the edges of the separation sieve plate on both sides; the flow guide mechanism comprises a fixed baffle and a conveying groove, and the fixed baffle is clamped in the transmission grooves; compared with the prior art, the elastic clamping net plate and the floating suspension shaft are linked in the application, when the liquid level rises, the suspension shaft is triggered to push the reset inserting rod, the transmission separation shaft is driven to stir the metal scraps, and the sieve hole is prevented from being blocked; the elastic framework and the reset pad plate of the separation sieve plate are deformed to drive the screening shaft to move, the shunting path is further dredged, the self-cleaning during the operation of the equipment is realized, and manual intervention is reduced.

This invention discloses a waste coffee grounds-based adhesive-free engineered wood panel and its preparation method in the field of waste recycling technology. It aims to solve the problems of existing engineered wood panels where chemical adhesives continuously release volatile organic compounds such as formaldehyde and benzene during hot pressing, and the significant limitations of coffee grounds resource utilization technology. The preparation of the waste coffee grounds-based adhesive-free engineered wood panel includes the following steps: mixing dried waste coffee grounds with polylactic acid to obtain a blend; melting and granulating the blend to obtain uniformly mixed particles; spreading the uniformly mixed particles onto the surface of an engineered wood panel substrate; hot pressing under preset conditions; and cooling to room temperature to obtain the waste coffee grounds-based adhesive-free engineered wood panel. The preparation process of this invention is green and efficient, providing the engineered wood panel industry with a low-cost, formaldehyde-free functional finishing solution.

The invention relates to the technical field of sewage treatment, and discloses a jet device for sewage treatment, the jet device comprises a jet device body, a water inlet pipe, a water outlet and an air inlet pipe, a suction chamber is arranged at the left end in the jet device body, and the right end of the suction chamber is connected with a throat pipe; the water outlet is connected to the right end of the throat pipe in a flaring mode, a water outlet flange plate is fixedly arranged at the outer end of the water outlet, and the air inlet pipe is fixedly arranged at the upper end of the side of the jet device body. The water inlet pipe is installed at the left end of the jet device body, a necking-down nozzle is arranged at the right end of the water inlet pipe and stretches into the position, opposite to the throat pipe, inside the suction chamber, and a liquid inlet flange plate is fixedly arranged at the outer end of the water inlet pipe. According to the jet device, sewage and gas are efficiently mixed in the jet device, the mixed sewage can be sprayed out at high pressure through the throat pipe and the flared water outlet, and higher treatment efficiency and effluent quality are shown in the sewage treatment process.

The invention discloses a method and system for recovering high-purity calcium fluoride from rare earth ore fluorine-containing raffinate, the rare earth ore fluorine-containing raffinate enters a nanofiltration separation unit after suspended solids and organic impurities are removed in a pretreatment unit, sulfate ions are intercepted by a nanofiltration membrane to form a sulfate concentrated solution, and monovalent fluorine ions enter nanofiltration produced water through the nanofiltration membrane; carrying out induced crystallization reaction on the nanofiltration produced water and lime milk in a calcium fluoride crystallization reactor to generate calcium fluoride crystals; small-particle calcium fluoride crystals obtained by solid-liquid separation from the effluent of the calcium fluoride crystallization reactor are sent back to the calcium fluoride crystallization reactor to serve as calcium fluoride seed crystals, and the water obtained by solid-liquid separation is discharged after reaching the standard; according to the method, the purity of the calcium fluoride generated by the method is stabilized at 90% or above, sulfate by-products can be produced, resource recycling of fluorine and sulfate in the rare earth raffinate is achieved, and the disposal amount of hazardous waste is greatly reduced.

This utility model relates to the field of waste disposal and discloses a waterborne floating waste grading and cleaning device, including a collection bin. A connecting rod is fixedly connected to the top outer wall of the collection bin, and a top frame is fixedly connected to the top of the connecting rod. A grading and cleaning mechanism is provided inside the collection bin. The grading and cleaning mechanism includes a first filter frame, the outer wall of which is fixedly connected to the inner wall of the collection bin. A second filter frame is fixedly connected to the inner wall of the collection bin. A connecting plate is fixedly connected to the outer wall of the inner ring of the top frame, and a movable plate is provided above the connecting plate. In this utility model, precise grading and collection are achieved through screens with different aperture sizes, quickly separating large floating objects from small fragments, reducing subsequent processing costs. The collection port is adjustable, allowing the collection efficiency to be adjusted according to the waste density, reducing energy consumption, saving operating costs, and avoiding safety hazards and environmental damage caused by external power sources.

The invention relates to a thick copper plate etching solution and an etching method thereof, which are characterized in that a proper porphyrin additive is selected in an acidic etching solution to improve the problems of fluctuation and unevenness of the copper surface; and meanwhile, roughness is improved, cleaning liquid containing surface active substances is used for cleaning after etching, residual substances and defects are reduced, prepreg is prepared by combining the method and selecting a solvent-free method to press the copper plate, so that the preparation process of the thick copper plate is simple, and pollution is little.