5740 results about "Dehydration" patented technology

A system for dehydration of organic material comprises a housing structure having an interior chamber, a supply duct, a dual trunk structure, a dry air intake, a central recirculation duct, and a plurality of side recirculation ducts. The side recirculation ducts each have a return plenum extending downward from a top recirculation duct and are configured to recirculate interior air contained in the chamber. The interior air enters the side recirculation ducts through the return plenums and is pushed upward and outward through the top recirculation ducts and back into the interior chamber. The interior chamber has a plurality of exhaust vents positioned in the upper region of its walls. A plurality of portable platforms positioned inside the interior chamber are configured to hold the organic material. The floor of the housing structure can include a plurality of tracks for loading, unloading and positioning the portable platforms.

The invention discloses a catalyst used for preparing acrylic acid and butyl ester by the dehydration of butyl lactate and a preparation method thereof. The catalyst is a composite catalyst, comprising a main catalyst A and auxiliary catalysts B, C, D and E, wherein, A is calcium sulphate, B is sulphuric acid, C is phosphate, D is alkaline matter and E is promoter. The preparation method comprises the steps as follows: five compositions A, B, C, D and E are sufficiently mixed, baked for 2-10 hours at the temperature of 200-800DEG C and formed for standby. The catalyst has high catalytic activation; under the catalysis of the catalyst, the molar yield reaches 75.1 percent and the molar selectivity of the acrylic acid and butyl ester reaches 71.5 percent. The preparation method has the advantages that the crystal structure of the main catalyst can be improved so as to be beneficial for carrying out the reaction; and the introduction of different auxiliary catalysts and quantities is helpful to improve the conversion ratio of the raw material and the product selectivity and is beneficial for improving the strength of the catalyst.

The invention discloses a centrifugal separation device for kelp processing and a use method of the centrifugal separation device, and belongs to the technical field of kelp centrifugal separation devices. Comprising a first cavity cylinder, a second cavity cylinder, a second servo motor and a separation disc, a plurality of sets of dynamic adjusting mechanisms are sequentially arranged and installed at the outer edge of the upper surface of the separation disc in a circumferential mode, a dehydration cylinder is formed through the dynamic adjusting mechanisms, and gas is injected in a reciprocating mode in the centrifugal separation process through dynamic adjustment; compared with a passive scheme depending on a flexible lining or rotating speed adjustment in the background technology, the active intervention mechanism can adjust the kelp distribution state in real time, and a moisture discharge channel is prevented from being blocked.

The present invention belongs to the field of resource utilization of building materials and solid waste, and relates to a red-mud-based cementing material based on efficient drying, component homogenization and activity improvement, and a preparation method therefor. The preparation method comprises: adding a filter aid to red mud to carry out sedimentation, then subjecting same to filter pressing until the water content is 14-16%, then drying the solid material, which has been subjected to filter pressing, until the water content is 4% or below, and finally grinding same to obtain the product. The filter aid comprises the following raw materials: 10-30 parts of polyaluminum chloride, 5-15 parts of polyaluminum sulfate, 1000-1200 parts of blast furnace slag or fly ash, 700-900 parts of steel slag, 400-600 parts of carbide slag or alkaline residues, and 300-400 parts of desulfurized gypsum or phosphogypsum or fluorgypsum. By means of the present invention, the dehydration efficiency of red mud can be improved, the red-mud-based cementing material can also be prepared in one step; the preparation process for the red-mud-based cementing material is simplified; and the prepared red-mud-based cementing material has the advantages of a high mechanical strength, high durability and erosion resistance.

The invention discloses an intelligent control method and system for muddy water treatment of a muddy water shield tunnel, and relates to the technical field of muddy water treatment.The method comprises the steps that physical characteristic data and chemical characteristic data of muddy water are collected in real time, preliminary treatment is conducted through edge computing nodes, and standardized muddy water characteristic data flow is output; carrying out preliminary screening operation on muddy water according to an intelligent separation strategy, and screening out medium-particle impurities; through self-adaptive dynamic vortex regulation and control, the muddy water rotational flow speed and the muddy water pressure are regulated, and medium particle impurities are subjected to rotational flow separation; carrying out deep separation treatment on medium-particle impurities subjected to cyclone separation, and outputting clear water and deposited mud cakes; clear water flows back to the shield tunneling machine through pumping equipment to be recycled, and deposited mud cakes are subjected to dehydration treatment. According to the invention, medium particle impurities are accurately separated according to the change of muddy water characteristics by utilizing a regulation and control method of dynamically adjusting the rotational flow speed and pressure, so that the muddy water separation efficiency is effectively improved, and the energy consumption is reduced.

The utility model belongs to the technical field of coal tar chemical industry, and particularly discloses a coal tar raw material layering dehydration device which comprises a raw material tank and a base, the lower end of the raw material tank is fixedly connected with the base, a feeding port is formed in the top of the raw material tank, and the outer side of the raw material tank is sleeved with a steam heat exchange sleeve. A water layer drain pipe is fixedly connected to the upper side of the raw material tank, an oil layer drain pipe is fixedly connected to the lower side of the raw material tank, a mixed drain pipe is fixedly connected between the water layer drain pipe and the oil layer drain pipe, the other end of the mixed drain pipe is fixedly connected with an electromagnetic three-way valve, and a liquid density sensor is fixedly connected to the inner wall of the raw material tank at the position of the mixed drain pipe. According to the utility model, the three liquid discharge pipes with different height positions are arranged, the liquid density sensor is arranged at the input end of the mixed liquid discharge pipe, and the controller is linked with the electromagnetic three-way valve at the output end of the mixed liquid discharge pipe, so that the automatic distinguishing and confirmation of an oil-water separation end point are realized, and the accuracy of oil-water separation is improved.

The partial or full dehydration of organic or inorganic matter containing water by induction of matter into a vacuum and processing matter through a specially designed acceleration channel is disclosed. The inducted matter accelerates in air from zero speed to sub-sonic speed to reach supersonic speed. As the material transitions the sound barrier, it is subject to acoustic shock waves and an instant negative pressure drop occurs. The sound waves disintegrate, disinfect the material and extract part or all moisture from any organic or inorganic material.

The invention relates to a manufacturing method of high-density aviation fuel, in particular to an aviation fuel mixture based on monoterpenoids and a preparation method of the aviation fuel mixture. Comprising monoterpenoids, polyhydric alcohols and a catalyst which serve as raw materials, and the mass ratio of the raw materials to the polyhydric alcohols is 1: 1. The conversion rate is high, the treatment steps are reduced, the thermal stability and combustion gravimetric heat of the product are improved, and the method is suitable for preparing aviation fuel with high density, low viscosity and low-temperature performance; cyclization and hydrogenation are carried out through a one-pot method, a reaction container does not need to be transferred, and the operation is simple; according to the polyol solvent system, cyclization of the monoterpenoids becomes easier due to participation of polyol, and the conversion rate is increased; according to the dual-catalyst system, a combination of an acidic catalyst and a heterogeneous hydrogenation catalyst is used in a reaction container, so that efficient dehydration and hydrogenation reactions are ensured; the aromatic compound content in the fuel can be controlled by adjusting hydrogenation conditions.

The invention relates to the technical field of material science and engineering, and discloses a nanocellulose-based oil-water separation and adsorption composite material, which is prepared from the following raw materials in parts by mass: 35 to 45 parts of nanocellulose; 8 to 11 parts of bagasse cellulose; 10 to 15 parts of sodium lignin sulfonate; 4 to 8 parts of chitosan; 5-10 parts of oxidized starch; 5 to 8 parts of cellulose nanowhiskers; 2-5 parts of silicon dioxide nanoparticles; 0.5 to 1 part of calcium carbonate nanoparticles; 1-2 parts of a citric acid cross-linking agent; 1-2 parts of graphene oxide; 0.3 to 0.6 part of ethylene diamine tetraacetic acid; 2-5 parts of glycerol; 0.4 to 1 part of stearoyl chloride; 2-4 parts of nano iron oxide; the preparation method comprises the following steps: pretreating the raw materials, mixing the pretreated raw materials into slurry, carrying out crosslinking and ultrasonic dispersion, standing to obtain a basic mixture, injecting the basic mixture into a mold, carrying out freeze drying to form a photocatalytic layer, carrying out centrifugal dewatering, carrying out chelation reaction, spraying a composite solution, and carrying out vacuum drying to obtain the photocatalytic material. The obtained composite material has the advantages of efficient adsorption capacity, good mechanical properties, environmental friendliness, degradability and low preparation cost.

The utility model relates to the technical field of sludge treatment, in particular to industrial wastewater sludge treatment equipment, which comprises an equipment main body, a dewatering box, a water pump arranged on the side surface of the dewatering box, and a water tank, the dewatering assembly comprises a filter screen plate arranged on the inner wall of the dewatering box in a sliding mode and a hydraulic rod fixedly arranged on the inner bottom wall of the dewatering box, the telescopic end of the hydraulic rod is fixedly connected with the lower surface of the filter screen plate, and a sealing cover plate is arranged on the upper surface of the dewatering box. According to the sludge dewatering device, the sludge pushing assembly and the triggering assembly are arranged, after the filter screen plate moves upwards to extrude and dewater sludge, dewatered sludge blocks can be driven to be automatically moved out of the dewatering box, and finally the driving motor is started to automatically and fully discharge the sludge blocks; further, the equipment breaks through the mode of dewatering the sludge by extruding from top to bottom in the prior art, and the defect that intercepted sludge blocks cannot be quickly discharged in the prior art is effectively overcome.

The invention belongs to the technical field of chemical production, and particularly relates to an efficient energy-saving refining system for producing cyclohexanone through dehydrogenation, which comprises an alcohol tower, a dehydrogenation heat exchanger, a dehydrogenation reactor, an alcohol tower feeding heat exchanger, a dehydrating tower, a light tower I, a light tower II, a ketone tower and an alcohol recovery tower which are connected in sequence, a middle feeding port of the alcohol tower is communicated with a tube pass discharging port of the alcohol tower feeding heat exchanger, a top discharging port of the alcohol tower is communicated with a tube pass feeding port of the dehydrogenation heat exchanger, a bottom discharging port of the alcohol tower is communicated with a middle feeding port of the alcohol recovery tower, and an alcohol ketone drying tower is additionally arranged between the alcohol tower feeding heat exchanger and the dehydration tower. A feed port of the alcohol ketone drying tower is communicated with a shell pass discharge port of the alcohol tower feed heat exchanger, and a liquid phase discharge port of the alcohol ketone drying tower is communicated with an upper feed port of the dehydrating tower. The alcohol tower adopts a process that raw materials directly enter the tower top, tower top reflux is cancelled, steam consumption is reduced, and the purpose of saving energy is achieved.

The invention relates to the technical field of washing machines, and discloses a double-drum full-automatic washing machine which comprises a machine shell, a cover plate is rotationally installed on the machine shell, water containing barrels with two water containing cavities are installed in the machine shell side by side, and each water containing barrel is fixedly connected with the machine shell through three springs. The springs are used for buffering vibration generated by the water containing buckets in the running process of the washing machine so as to keep the stability of the water containing buckets, a dewatering barrel is arranged in each water containing bucket, a gap exists between each dewatering barrel and the inner wall of the corresponding water containing bucket, and a washing motor is installed at the bottom of the outer side of each water containing bucket. And the washing motor and the dewatering cylinder are coaxially arranged. The two independent water buckets are arranged, and each bucket is provided with a completely independent water inlet and drainage system, so that classified washing of different types of clothes is realized, and cross contamination is effectively avoided. By means of the design, a healthier and more sanitary clothes washing environment is provided for a user.

The present disclosure relates to methods that enable the continuous formation of droplets and dehydration of droplets to provide pharmaceutically relevant particles that can be used for therapy. In particular, the methods disclosed herein allow the controlled continuous droplet formation and dehydration that produce circular particles having low internal void spaces comprising bioactive therapeutic biologies.

The invention belongs to the field of lake ecological desilting, and discloses a shallow lake bottom mud ecological desilting and residual water treatment combined treatment method which comprises lake bottom mud ecological desilting, solidification dehydration treatment and residual water treatment. Ecological dredging of the lake bottom mud is implemented by adopting an environment-friendly cutter suction dredger and a sealed pipeline to convey mud, and the bottom mud is conveyed to a mud discharge field to be solidified and dehydrated. A vacuum preloading technology is adopted for solidification and dehydration of the bottom mud, pore water of the bottom mud is effectively discharged by increasing the pressure difference between soil bodies of a drainage plate, and the overall solidification effect is improved. The residual water treatment comprises the treatment of desilting and solidifying residual water, the technologies of multi-stage precipitation, mechanical aeration, aquatic plant remediation and the like are adopted, and the residual water is discharged nearby after being treated to reach the standard. The combined treatment method aims at effectively reducing endogenous pollution of lakes, promoting lake water quality improvement and guaranteeing water safety of regional lakes and reservoirs, and is particularly suitable for ecological dredging engineering of shallow lakes, short construction period and fine-particle bottom mud.

The invention provides three-stage extrusion type coal slime filter pressing equipment and a working method. The filter pressing equipment structurally comprises a thrust plate, a filter plate, filter cloth, a cross beam, a pressing plate, a pressing hydraulic system, a sealing unit, a feeding unit, a control unit and the like; columnar protruding structures arranged in an array mode are arranged on the outer surface of the filter plate, and each columnar protruding structure is in the structural form that a cone and a semicircle are combined. According to the requirements of the size and the dehydration rate of the filter plate, the columnar bulge structures are arranged on the surface of the filter plate by adopting a topological optimization method, so that the dehydration rate of the coal slime is improved, and the separation of a filter cake is facilitated; the pressing plate is of a sectional structure and is divided into three sections from left to right, and each section is connected with piston rods of the corresponding three hydraulic cylinders and corresponds to a three-stage extrusion working mode. And when the previous-stage extrusion pressure reaches 40% of the threshold pressure, the next-stage extrusion procedure is started. 40% of the extrusion threshold pressure can be set to ensure that the first two-stage extrusion is not finished when the third-stage extrusion process is started, so that the optimal extrusion mode of three-stage simultaneous extrusion is formed, the coal slime dehydration rate is increased to the greatest extent, and the filter pressing effect is improved. By adopting the three-stage extrusion mode, the dehydration process of each sub-area can be freely, flexibly and independently controlled, the toothpaste extrusion type collaborative filter pressing effect is achieved, the coal slime dehydration rate is higher, and the filter pressing effect is better.

An equipment for in-situ restoration of sediment, including an amphibious platform and following devices provided on the amphibious platform: a screw suction device, one end of which is hinged to one end of the amphibious platform, and the other end can extend into the sediment for sucking up the sediment; a dehydration device that is provided downstream of the screw suction device and communicates with one end of the screw suction device; a sediment treatment device that is provided downstream of the dehydration device for treating the sediment and processing it into a planting base; a grass blanket processing device that is provided downstream of the sediment treatment device for planting submerged plants on the planting base to form a submerged grass blanket; a grass blanket paving device, one end of which is close to the grass blanket processing device, and the other end extends toward the screw suction device and into the water; a drainage pipe that respectively communicates with the dehydration device and the sediment treatment device; and a hopper through which the sediment is conveyed between the dehydration device and the sediment treatment device. In the invention, the highly polluted sediment is subjected to bio-safety disposal to form a planting base for the growth of submerged vegetation, so as to realize the in-situ restoration of the sediment of rivers and lakes.

The invention discloses a rapid tubular induced crystallization reaction process and device for fluorine-containing wastewater, the device comprises a tubular reactor, a crystal sedimentation tank and crystal dehydration equipment, the fluorine-containing wastewater is pumped from a water inlet at one end of the tubular reactor, calcium liquid is pumped from dosing ports at intervals on the tubular reactor along the flowing direction of the wastewater at a set flow rate, and the calcium liquid is pumped from the dosing ports at intervals along the flowing direction of the wastewater; the fluorine-containing wastewater reacts with a calcium agent in the tubular reactor to generate calcium fluoride crystals with the particle size range of 10-80 microns, a mixture is discharged into a crystal sedimentation tank through a water outlet in the other end of the tubular reactor, clear water is discharged from a water outlet in the upper portion of the crystal sedimentation tank, and crystal slurry sinking to the bottom of the crystal sedimentation tank is pumped into a cyclone separator through a crystal discharging pump; large-particle crystals discharged from an outlet in the lower end of the cyclone separator are collected by a crystal collection pool and are regularly discharged into crystal dehydration equipment for dehydration, small-particle crystals discharged from an outlet in the upper end of the cyclone separator flow back to the water inlet end of the tubular reactor, the reactor is small in size and low in investment, and the stability of the calcium fluoride crystal product quality is guaranteed.

The invention relates to the technical field of oral liquid bottle cleaning and sterilizing, in particular to an oral liquid filling bottle body cleaning and sterilizing device. Comprising a case, an inner frame is arranged in the case, a motor, an inner gear ring and an outer gear ring are fixedly mounted on the inner frame, an intermittent shaft and a revolution shaft are rotatably mounted on the inner frame, two transmission interruption areas are arranged on the inner frame and correspond to the position between the inner gear ring and the outer gear ring, and a transmission wheel is mounted at the output shaft end of the motor; three fan-shaped tooth sections and three tooth-free arc sections are alternately arranged on the transmission wheel, the central angles of the three fan-shaped tooth sections are gradually increased by 30 degrees in the clockwise direction, and a driven gear meshed and matched with the fan-shaped tooth sections is mounted on the intermittent shaft. The device has the beneficial effects that through precise linkage of the motor, the transmission wheel, the variable-speed shaft, the inner gear ring and the outer gear ring, a stepped dehydration system is constructed, and the problem that stubborn water stains of traditional oral liquid bottle cleaning and sterilizing equipment are difficult to peel off is solved.

The utility model relates to a heating system for dehydrating and sintering a loose body, and the heating system comprises an isolation cylinder which is internally provided with a high-temperature heating area and is provided with a gas inlet, and the gas inlet is used for providing reaction gas for the high-temperature heating area; the rod feeding device is movably arranged in the axis direction of the isolation barrel and is used for moving the loose body to a high-temperature heating area in the isolation barrel; the first heater is arranged on the outer side of the isolation barrel and used for heating the isolation barrel to form a high-temperature heating area; and the second heater is arranged on the rod feeding device and faces one end of the loose body, and the second heater is used for heating the loose body. According to the technical scheme provided by the invention, the difference of geometric dimensions and optical characteristics of each part of the loose body after the dehydration and sintering process of the loose body can be reduced, and the quality of the optical fiber preform is improved.

The invention relates to the technical field of preparation of building materials, and discloses an ultra-high performance polycarboxylate superplasticizer for UHPC (Ultra High Performance Concrete). The superplasticizer composition comprises the following components in parts by weight: 20-30 parts of ethyl acrylate; 20 to 30 parts of sodium acrylate; the invention also provides a preparation method of the ultra-high performance polycarboxylate superplasticizer for UHPC, and the preparation method comprises the following steps: S1, raw material preparation: dissolving ethyl acrylate, sodium acrylate, sodium allylsulfonate, hexadecyl acrylate and diene peroxide in 50-100 parts of water to form a uniform solution; and S2, mixing and pre-polymerizing. By introducing nano silicon dioxide, an ultrasonic dispersion technology and a low-temperature vacuum dehydration technology, the dispersity and anti-permeability of the water reducing agent and the fluidity of concrete are improved, meanwhile, high strength is kept, and the problems that concrete is uneven in performance and poor in constructability are solved.

The invention discloses a method for drying sludge through microwave pyrolysis, which relates to the technical field of sludge treatment and comprises the following steps: step 1, reducing the water content of the sludge in a mechanical dehydration manner, and then screening out lumps; 2, extruding the sludge, and uniformly laying the sludge on a microwave material distribution belt; 3, the material distribution belt penetrates through a tunnel type microwave generator, and the sludge is heated and dried through microwaves; 4, the dried sludge is separated from the cloth belt, and the sludge is collected; wherein a tunnel type microwave generator adopted in the third step comprises a guide roller and a pressing roller, the guide roller makes contact with the lower surface of the cloth belt conveying part, so that the cloth belt forms an inclined section, and the pressing roller is located behind the guide roller and makes contact with the upper surface of the cloth belt conveying part, so that the cloth belt forms an arc-shaped section tightly attached to the guide roller. In the invention, the turning plate does not need to be contacted with the cloth belt, so that the condition that the surface of the conveying belt is scratched is avoided.

The invention relates to the technical field of preparation of manganous-manganic oxide, in particular to a production and preparation process of a manganous-manganic oxide material for batteries, which comprises the following steps: dissolving high-purity manganese sulfate to prepare a manganese sulfate solution, and adding a dispersing agent and a surfactant to obtain a manganese salt solution; the method comprises the following steps: adding a base solution into a reaction kettle, stirring and heating, conveying a manganese salt solution and ammonia water, synchronously introducing oxygen, dividing the whole oxidation reaction process into two stages, controlling the flow velocity of the ammonia water in different stages, and dynamically adjusting the temperature; and carrying out suspension precipitation on manganous-manganic oxide obtained by the oxidation reaction, aging, and carrying out dehydration suction filtration, washing and drying to obtain the manganous-manganic oxide material for the battery. The invention aims to adjust the morphology of the manganous-manganic oxide finished product by controlling reaction conditions, effectively reduce the granularity of the product and enhance the uniformity of particle size distribution.

A self-adaptive multi-layer filter pressing system comprises filter pressing equipment and folding equipment, the filter pressing equipment comprises an upper crawler belt mechanism, a lower crawler belt mechanism and a pressure execution element, a filter pressing area is formed between the upper crawler belt mechanism and the lower crawler belt mechanism, and the thickness of the filter pressing area is reduced in the advancing direction of materials; the upper track mechanism comprises an upper pressing plate used for pressing a filter pressing area, the lower track mechanism comprises a lower pressing plate used for supporting the filter pressing area, the output end of the pressure execution element is connected with the upper pressing plate and applies pressure to the upper pressing plate, and the upper pressing plate can move up and down along with the output end of the pressure execution element; the folding device is used for folding the filter belt wrapping the materials into multiple layers of materials. According to the utility model, sludge is folded into multiple layers of materials and then enters the filter pressing area to be subjected to filter pressing, and the pressure executing element is matched with the upper pressing plate, so that the problem of machine blocking can be avoided, the multiple layers of materials can smoothly pass through the filter pressing area to be dehydrated, and thin-layer, efficient and continuous deep dehydration is realized.

The utility model relates to a spatial multilayer ultrahigh pressure belt type dehydration system which comprises a main rack, a material distributing and feeding device, a material distributing device, a filter belt, a filter belt traction machine, a filter pressing hydraulic machine, a hydraulic station and a controller, the material distributing and feeding device, the material distributing device, the filter belt traction machine and the filter pressing hydraulic machine are connected and mounted on the main rack; and the output end of the material distributing and feeding device is connected and mounted above the material distributing device. The dehydration method comprises the steps of equipment starting, material distribution, filter pressing dehydration and unloading. The organic waste dehydration device is higher in dehydration efficiency and lower in cost, and can be used as an organic waste dehydration device capable of reducing pollution and carbon.

The invention relates to the technical field of synthesis and preparation of nano materials, in particular to a method for preparing tin dioxide powder, which comprises the following steps: S1, preparing a 0.1-5 mol / L tin salt solution, adding a compound additive into the tin salt solution, and carrying out ball milling treatment after ultrasonic dispersion to obtain a pretreated tin salt solution; s2, freezing and freezing the pretreated tin salt solution in an ultralow-temperature environment to obtain a frozen sample; s3, transferring the frozen sample into a vacuum freeze dryer for dehydration treatment to obtain solid powder; and S4, carrying out high-temperature calcination on the solid powder to obtain tin dioxide powder. Zero sewage discharge is achieved in the preparation process, the problem of sewage discharge and treatment of traditional liquid-phase powder preparation is solved, meanwhile, the phenomenon of sintering agglomeration accompanied by traditional solid-phase calcination can be avoided, high-quality superfine tin dioxide powder preparation is achieved, the method is simple and safe in process, and industrial large-scale production and preparation are easy to achieve.

The invention provides a plasma heating hydrogen-rich direct reduction ironmaking system and method. The system comprises a plasma shaft furnace, a heat exchanger, a washer, a desulfurization device, a dehydration device and a pressurization device, the plasma shaft furnace comprises a feeding area, a reduction area, a blanking area and a plasma heating area from top to bottom; the plasma heating area is provided with a hydrogen plasma torch, a thermal reduction gas circulation outlet and a hydrogen inlet; and the hydrogen plasma torch is used for heating and ionizing hydrogen entering from the hydrogen inlet. According to the system and method, the green electricity hydrogen plasma torch is adopted for heating and ionizing hydrogen, then sponge iron is heated and reduced to produce molten iron, compared with a traditional hydrogen heating mode, the heating speed is high, the temperature is high, carbon-containing fuel is not combusted, safety and hydrogen embrittlement are achieved, compared with a traditional shaft furnace for producing sponge iron, low-quality ore can be adopted for producing molten iron, and the production cost is low. The control is convenient.

The invention discloses a method for purifying acetonitrile, and belongs to the technical field of organic solvent purification. The acetonitrile purification method comprises the following steps: dehydrating an acetonitrile solution through a membrane dehydration device, enabling the dehydrated acetonitrile to pass through an adsorption column filled with a magnetic iron oxide / graphene composite adsorbent, and collecting effluent; and carrying out normal pressure rectification on the effluent, controlling the reflux ratio to be 10: 1-8, the heating temperature of the rectification kettle to be 110-150 DEG C, the temperature of the acetonitrile liquid in the kettle to be 80-90 DEG C and the temperature of the distilled liquid to be 75-85 DEG C, and collecting to obtain purified acetonitrile. The method effectively solves the problems that a traditional potassium permanganate oxidant is adopted for purification at present, impurities generated by reaction are insoluble in water and difficult to remove, the environment is polluted to a certain extent, the impurities need to be filtered and removed, the operation is tedious and the like, is green and safe, and does not generate waste residues; and the final acetonitrile yield is greater than 90%, and the purity reaches 99.99%.

The present disclosure relates to methods that enable the continuous formation of droplets and dehydration of droplets to provide pharmaceutically relevant particles that can be used for therapy. In particular, the methods disclosed herein allow the controlled continuous droplet formation and dehydration that produce circular particles having low internal void spaces comprising bioactive therapeutic biologics.

The invention relates to the field of medical materials and medical instruments, and discloses a dry bioprosthetic valve and a preparation method thereof.The preparation method comprises the following steps that S1, pericardium and a cross-linking agent solution are mixed for a cross-linking reaction; s2, carrying out first dehydration treatment on the crosslinked pericardium by adopting a first dehydration solution with gradually increased concentration gradient under an ultrasonic condition; and S3, carrying out second dehydration treatment on the pericardium subjected to the first dehydration treatment by adopting a second dehydration solvent, so as to obtain the dried bioprosthetic valve. According to the preparation method provided by the invention, ethanol, isopropanol and water in a specific proportion are adopted to prepare a dehydration solution with gradient concentration, and two-step dehydration drying is carried out in combination with the physical effect of an ultrasonic technology and glycerol, so that rapid rehydration of the bioprosthetic valve is realized, and the original shape and mechanical property of the bioprosthetic valve can be better recovered after rehydration; and the immediate hemodynamic stability of the valve is improved.

The invention relates to high-water-content ABS powder extrusion dehydration equipment, and aims to solve the problem that in the prior art, the high-water-content ABS powder is dehydrated until the water content is 18 wt% or below, and meanwhile plasticizing is avoided, the high-water-content ABS powder extrusion dehydration equipment comprises an extrusion mechanism used for carrying out extrusion dehydration on the high-water-content ABS powder; the drainage mechanism is used for receiving water discharged by the extrusion mechanism and discharging the water out of the extrusion dehydration equipment; the feeding mechanism is used for feeding ABS powder with high water content into the extruding mechanism; wherein the extruding mechanism comprises a conveying section, an extruding section, a crushing section and a dispersing section; the drainage mechanism is connected with the extrusion section; and the feeding mechanism is connected with the conveying section. By means of the equipment, the water content of the ABS wet powder can be reduced to 18 wt% or below from 50 wt% or below, the dehydrated ABS wet powder is still kept in powder and cannot be plasticized, and the follow-up blending and dispersing processes are facilitated.