102results about How to "Reduce water content" patented technology

The utility model discloses surface drying equipment for silk fabric processing. The surface drying equipment comprises a conveying mechanism and a rack, a conveying mechanism is fixed to the top of the rack, an extrusion structure is arranged at the top of the conveying mechanism, a drying furnace is fixed to the top of the rack, and a control module is installed at the top of the drying furnace; and the extrusion structure comprises a first gear, a pressing shaft, a second gear and a water collecting tank. According to the silk fabric drying device, the extrusion structure is arranged, the servo motor drives the net belt to rotate, in the process that silk fabric is conveyed into the drying furnace, through cooperation between gears, the pressing shafts move reversely, the pressing shafts are close to the driven shaft at the bottom, the silk fabric passing through is extruded between the two shaft bodies, and the silk fabric is dried. According to the surface drying equipment for silk fabric processing, the water in the surface drying equipment is compressed and dripped into the water collecting tank at the bottom, so that the effect that the surface drying equipment for silk fabric processing facilitates fabric dehydration is achieved, the amount of water needing to be treated by the drying equipment is reduced, and energy is saved.

The utility model provides a seedling raising tray watering device for automatic rice seedling raising equipment, and relates to the technical field of crop planting equipment. Comprising a mounting frame detachably connected with a conveying mechanism of the seedling raising equipment, a channel for seedling raising trays to go in and out is reserved between the mounting frame and the conveying mechanism of the seedling raising equipment, a limiting assembly used for limiting movement of the seedling raising trays is arranged in the mounting frame, and a watering assembly arranged in the seedling raising trays is arranged in the mounting frame. The watering assembly can be arranged in a bearing substance, used for bearing seeds, in the seedling raising tray, so that water on the surfaces of the seeds and water on the middle and lower layers of the seedling raising tray are evenly distributed, and it can be guaranteed that the device thoroughly waters the seeds and the bearing substance in the seedling raising tray through the structure. The problem that the water content of the seeds and the bearing substance is high is avoided, and the development success rate of the seeds is increased.

The invention discloses a natto preparation solid-liquid separation device and a high kinase natto preparation method, and relates to the field of natto production.The natto preparation solid-liquid separation device comprises a fermentation vat, the fermentation vat comprises a lower vat body and an upper vat body, and a sealing ring is arranged at the joint of the lower vat body and the upper vat body; the stirring part comprises a rotary center rod arranged on the upper barrel body, stirring blades arranged at the bottom end of the rotary center rod, a mounting rod movably connected to the bottom of the rotary center rod, a rotating plate arranged on the mounting rod and a stirring rod arranged on the lower surface of the rotating plate; the pressing piece comprises a rotating sleeve arranged on the rotary center rod, a lifting sleeve arranged on the rotating sleeve and a pressing plate arranged at the bottom end of the lifting sleeve; according to the solid-liquid separation device for natto preparation, by arranging the stirring piece, raw materials can be stirred during fermentation, so that the raw materials and a mixed solution of bacillus natto are fully mixed, the raw materials can be pressed after mixing, redundant liquid is pressed out, a better fermentation environment can be obtained for natto, and the situation that a large amount of water influences natto fermentation is avoided.

The invention discloses a low-moisture and high-safety lithium battery diaphragm and a preparation method thereof.The low-moisture and high-safety lithium battery diaphragm comprises a base membrane and a coating on the base membrane, the coating comprises modified gamma-phase superfine porous aluminum oxide, the modified gamma-phase superfine porous aluminum oxide is obtained by modifying gamma-phase superfine porous aluminum oxide through a silane coupling agent, and the modified gamma-phase superfine porous aluminum oxide is prepared from modified gamma-phase superfine porous aluminum oxide. The silane coupling agent is one of a vinyl silane coupling agent and a methyl silane coupling agent. According to the invention, surface modification is carried out on gamma-phase superfine porous alumina by using a silane coupling agent with a hydrophobic group, so that the diaphragm has high ionic conductivity, good high temperature resistance and good liquid absorption and retention capability, and meanwhile, the water content of the diaphragm is reduced.

The invention relates to the technical field of comprehensive recycling of solid wastes, in particular to filling paste based on red mud and a preparation method of the filling paste. The preparation method comprises the following steps: grinding and mixing industrial solid wastes, an adsorbent and red mud to obtain ground powder; carrying out dry activation on the ground powder under the condition of a preset temperature, so as to obtain gelling powder; the method comprises the following steps: mixing Bayer process red mud, aggregate and a cementing material to obtain a pre-filling dry material with a mixed red mud component; mixing an acid activator, a water reducing agent, water and the pre-filling dry material to obtain filling paste; wherein the preset temperature is less than or equal to 350 DEG C. According to the preparation method, the compressive strength of the filling paste can be improved, and in addition, large-scale consumption of the red mud can be realized.

The utility model discloses cedrela sinensis freeze-drying processing equipment which comprises an installation shell and a refrigeration mechanism and further comprises a screen plate arranged on the inner side of the installation shell, and an installation strip fixed in the installation shell is arranged at the outer end of a water absorption mechanism. According to the cedrela sinensis freeze-drying processing equipment, part of liquid on the surface of cedrela sinensis placed on the upper side of the screen plate is absorbed through the water absorption mechanism, so that the water content of the surface can be reduced before freeze-drying forming, the water absorption mechanism can move back and forth in a reciprocating mode through rotation of the guide wheel, and the water absorption efficiency is improved. The toona sinensis on the upper side of the screen plate can be turned over to a certain degree, so that water existing in the contact surface between the toona sinensis and the screen plate can be separated from the screen plate and the toona sinensis, the water separation rate is further increased, the water content of the surface of the toona sinensis is reduced, meanwhile, the toona sinensis can be prevented from being attached to the screen plate after being freeze-dried and formed, and the quality of the toona sinensis is improved. The toona sinensis is convenient to take out and prevented from being damaged.

The utility model discloses a dry flour storage tank with a flour output mechanism, and relates to the technical field of dry flour storage. The device comprises a fixed frame and a storage tank, the fixed frame is provided with a material turning mechanism, a dehumidification mechanism and an output mechanism, and the material turning mechanism comprises a lifting assembly and a material blocking assembly; the lifting assembly comprises a motor fixedly connected to the top face of the storage tank, the output end of the motor is fixedly connected with a rotating rod, the bottom end of the rotating rod extends into the fixing frame, the rotating rod is rotationally connected with the fixing frame, and the outer wall of the rotating rod is fixedly connected with spiral blades. A plurality of supporting rods are fixedly connected to the inner wall of the storage tank, and connecting sleeves are fixedly connected between the multiple supporting rods. Through the arrangement of the material turning mechanism, flour at the bottom in the storage tank can be smashed and conveyed upwards, after the flour is conveyed to the top of the connecting sleeve, the flour can be scattered and fall down, and blockage caused by flour caking is avoided.

The utility model relates to the technical field of papermaking mesh production, and discloses a drying device for monofilament papermaking mesh production, which comprises a shell, a cavity is arranged in the middle of an inner cavity of the shell, a motor is fixedly mounted on the rear portion of the inner cavity of the cavity, and a rotating handle is fixedly connected onto an output shaft of the motor through a coupler. The front portion of the rotating handle is movably connected with a traction rod through a shaft, the bottom end of the traction rod is movably connected with a lifting rod through a shaft, the lifting rod is movably connected with the bottom of an inner cavity of the cavity in a sleeved mode, a connecting block is fixedly installed at the bottom end of the lifting rod, and the bottom of the connecting block is movably connected with a stretching roller through a shaft. The stretching roller is driven by the motor to stretch and shake the monofilament papermaking mesh, material shrinkage stress is counteracted, mesh hole blockage and deformation caused by monofilament winding or adhesion are avoided, surface roughness or protrusions are reduced through mesh piece tensioning, the flatness requirement is met, water in the material is migrated through shaking, the water content is reduced, and therefore the needed drying time is shortened. The device working efficiency is improved.

The oil-water residue three-phase separator comprises a three-phase separation device, the three-phase separation device comprises a fixing support, a residue discharge flat box and a liquid discharge flat box are fixedly connected to the top face of the fixing support in an inserted mode, and the bottom end of the liquid discharge flat box communicates with a liquid discharge bent pipe; an isolation machine shell is fixedly connected between the deslagging flat box and the liquid drainage flat box, the bottom face of the isolation machine shell is in a left-high right-bottom shape, and the bottom face of the isolation machine shell communicates with a water drainage pipe located at the right end of the isolation machine shell. The extrusion pushing mechanism can be driven to move leftwards through the reciprocating conversion piece, extrusion force can be applied to particles in the centrifugal dewatering mechanism through the extrusion pushing mechanism, the dewatering effect is achieved, the water content in the particles can be reduced again, the particles are dewatered for three times, the water content in the particles is extremely low, and the dewatering effect is good. The oil-water-residue three-phase separator suitable for oil sludge treatment can meet the required standard of solid-liquid separation, does not need secondary transfer and treatment, saves time and labor, is high in treatment efficiency, and improves the practicability of the oil-water-residue three-phase separator suitable for oil sludge treatment.

The utility model discloses a fine-grade tailing dehydration device for lead ore processing, which relates to the technical field of tailing dehydration, and comprises a plurality of sedimentation tanks which are communicated with one another, drainage gates are arranged among the sedimentation tanks, and the drainage gates can adjust the height of flowing water between the adjacent sedimentation tanks. The sedimentation tank located at the tail end is communicated with a dehydration device through a water pipe, a water throwing tank is rotationally arranged in the dehydration device, the peripheral side of the water throwing tank is of a latticed double-layer structure, and the double-layer structure of the water throwing tank is filled with a filter element of an annular structure. According to the fine-grade tailing dewatering device for lead ore processing, the dewatering device is arranged, water passing through the sedimentation tank flows into the dewatering device, the water is thrown out after being blocked by the filter element through rotation of the water throwing tank, and tailings are left to be stored in the water throwing tank, so that the water content in the tailings is reduced; and the water can also be poured into the dehydration device to be dehydrated again.

The invention discloses a high-heat-resistance and high-infiltration lithium battery diaphragm and a preparation method thereof, the high-heat-resistance and high-infiltration lithium battery diaphragm comprises a base membrane and a coating on the base membrane, the coating is obtained by coating slurry, the slurry comprises flaky wollastonite fibers, a silane coupling agent, an adhesive and a dispersing agent, and the silane coupling agent is vinyltriethoxysilane. The width of the flaky wollastonite fiber is less than 1.5 mu m, the length is 2.0-7.0 mu m, and the thickness is 0.1-0.5 mu m. The high-heat-resistance and high-infiltration lithium battery diaphragm disclosed by the invention has excellent heat resistance and wettability, relatively high breakdown voltage and relatively low water content.

The invention provides a device and a method for continuously removing a solvent from a waterborne polyurethane emulsion. The device comprises a desolventizing tower, a cooling device and a vacuum device which are connected in sequence, a heating device is arranged outside the desolventizing tower; a plurality of tower trays are arranged in the desolventizing tower, one end of each tower tray is fixed on the inner wall of the desolventizing tower, and the other end of each tower tray is provided with an overflow weir. According to the device and the method provided by the invention, the problems of low efficiency, high vacuum degree, easiness in skinning, deslagging, bubbling, heater blockage and the like in the traditional process of removing the solvent from the waterborne polyurethane emulsion are effectively solved; the device can automatically, efficiently, quickly and continuously remove the organic solvent in the waterborne polyurethane emulsion, the water content in the removed organic solvent is low, and the water can be used for subsequent production without being separated and purified by a refining system again.

The present application discloses a positive electrode active material composition, an aqueous positive electrode slurry, a positive electrode sheet, a secondary battery, and an electric device. The positive electrode active material composition comprises a first positive electrode active material, a second positive electrode active material, and a third positive electrode active material. The volume mean particle diameter Dv50 of the first positive electrode active material is A1 µm, wherein 0.2≤ A1≤0.8; the volume mean particle diameter Dv50 of the second positive electrode active material is A2 µm, wherein 1.0≤A2≤2.5; and the volume mean particle diameter Dv50 of the third positive electrode active material is A3 µm, wherein 3.0^A3^6.0. According to the present application, the positive electrode sheet can have relatively high compaction density and also have relatively low moisture content.

The utility model provides a device and a system for producing an optical fiber preform based on industrial grade D4. The device for producing the optical fiber preform based on the industrial grade D4 comprises a coarse treatment device, a fine treatment device, a low-boiling-point impurity treatment device and a high-boiling-point treatment device which are communicated in sequence, an anion-cation exchange resin membrane and a molecular sieve are arranged in the fine treatment device to remove metal ions and anion impurities in the D4 liquid, the low-boiling-point impurity treatment device is used for separating low-boiling-point impurities in the D4 liquid, the high-boiling-point treatment device is used for separating high-boiling-point impurities in the D4 liquid, and a gas outlet of the high-boiling-point treatment device is communicated with the combustor. According to the device provided by the utility model, the existing commercially available industrial grade D4 is utilized, the adverse effect of gel on deposition production equipment in the D4 gasification process is relieved, the tolerance requirement of the deposition equipment on the purity of the raw material D4 is increased, and the production cost of the optical fiber preform can be reduced.

The present invention relates to the field of detection technology, and specifically, to a method and device for detecting the black carbon particle component in snow and ice samples, including the following steps: S1, sample preparation and preliminary treatment; S2, differentiated treatment according to different water contents; S3, atomization and detection and transportation; S4, black carbon particle component detection. The snow and ice samples are pressurized and crushed by moving the pressure holding component downward. If they are broken into multiple pieces, it indicates that the sample has a low water content and a high hardness; if a large amount of liquid is squeezed out, it indicates that the water content is high and the hardness is low. The gravity of the squeezed out liquid is used to reduce the internal space of the adjustment component and reduce the gas pressure, so that the snow and ice samples with a water content higher than 50% of the sample mass are subjected to a gas pressure of 0.1-0.3MPa; effective atomization treatment is performed on snow and ice samples with different water contents, and the composition of the black carbon particles therein is accurately detected, which greatly improves the accuracy of the entire detection process and provides reliable data support for the study of black carbon particles in snow and ice samples.

The invention discloses a method for preparing distillation-free biodiesel from low-acid-value waste oil and fat, which comprises the following steps of: degumming the low-acid-value waste oil and fat, removing metal ions, and dehydrating for the first time to obtain pretreated oil and fat; carrying out subcritical ester exchange reaction on the pretreated grease and methanol to obtain crude fatty acid methyl ester; and carrying out dealcoholization, alkali washing, water washing and secondary dehydration on the crude fatty acid methyl ester to obtain the distillation-free biodiesel. The method is simple, energy consumption is low, no extra catalyst needs to be added, the content of fatty acid methyl ester in the prepared biodiesel is 96.5% or above, and the yield can reach 99% or above.

The present invention relates to an oily wastewater treatment system and a treatment method, wherein the oily wastewater treatment system comprises: a frame, which is provided with an inlet, a pipeline and a third outlet; a cylinder, which is rotatably arranged on the frame and provided with a first outlet; a cylinder, which is rotatably arranged in the cylinder, and the rotation of the cylinder can drive the cylinder to rotate together and make the water and oil stratification through centrifugal action, the bottom heavy oil is discharged from the first outlet, and the middle water can be discharged from the third outlet; a piston, which is slidably arranged on the pipeline and provided with a second outlet, can move downward and press on the upper floating oil, so that the upper floating oil can be discharged from the second outlet. The advantages of the present invention are: by setting a cylinder with a rotatable angle, the cylinder can realize centrifugal stratification and self-rotation separation through the change of the angle, thereby realizing that multiple treatment steps of industrial wastewater can be completed through one cylinder, without changing the container of the wastewater through a pump.

The application provides a preparation method of a sodium-rich and low-water-content Prussian blue positive electrode material, which comprises the following steps: dissolving sodium ferrocyanide or a hydrate thereof and a complexing agent in deoxygenated water under an inert gas atmosphere and at a certain temperature to obtain a mixed solution A; dissolving a transition metal salt or a hydrate thereof, a sodium supplementing agent, a complexing agent and an auxiliary complexing agent in deoxygenated water under an inert gas atmosphere and at a certain temperature to obtain a mixed solution B; continuously stirring solution A and solution B by dropwise adding them into a container with a positive pressure inert gas atmosphere and at a certain temperature, continuing to stir for a period of time after the dropwise adding is completed, and then standing, centrifuging and vacuum drying to obtain the Prussian blue positive electrode material. The Prussian blue positive electrode material comprises a mixed phase structure of rhombic phases and cubic phases, has the characteristics of high sodium content and low water content. The battery assembled by using the positive electrode material obtained by the method has a theoretical specific capacity close to the theoretical specific capacity under a small current density and still has a high specific capacity under a large current density.

This invention provides an absorbent for capturing carbon dioxide and a method for capturing carbon dioxide. By volume percentage, the absorbent comprises 20-60% glycine salt aqueous solution, 10-50% triethylene glycol monomethyl ether, 5-10% ethylene glycol, and the balance being water. This absorbent combines the advantages of glycine salt systems, such as low volatility, non-toxicity, safety, and better antioxidant degradation resistance, while avoiding the risk of solid precipitates forming after absorption by the glycine salt system, which could cause pipeline blockage.

The invention discloses a circulating fan drying system and method, and belongs to the technical field of drying systems.The circulating fan drying system comprises a plurality of foot pads, the upper ends of the foot pads are fixedly connected with a drying oven, and the upper end of the drying oven is fixedly connected with a drying system; the drying system comprises an air blowing mechanism fixedly connected to the upper surface of the drying oven, the upper surface of the drying oven is fixedly connected with a fan shell, and the end, away from the air blowing mechanism, of the fan shell is fixedly connected with a circulating air inlet pipe. Through the use of the blowing mechanism, the driving mechanism and the drying mechanism, when a circulating fan drives air to circularly flow, moisture is absorbed, air entering the drying oven again is dried, the drying efficiency is improved, meanwhile, the drying mechanism can be repeatedly used, the overall use cost is greatly reduced, and through the arrangement of the drying oven shell and the inner container, the drying efficiency is improved. Air convection is facilitated, and the drying efficiency is improved.

The invention discloses a dehydration and impurity removal integrated device and method for waste bio-oil. The device comprises a vertical tank body, an inner cylinder located in the vertical tank body and an annular outer cylinder formed between the inner cylinder and the vertical tank body. The inner cylinder and the annular outer cylinder are sequentially filled with different coalescence media in a W-shaped series connection mode, suspended solids of different sizes and types are captured and intercepted, water drops of different sizes are coalesced, grown and separated, and rapid, deep and efficient dehydration and impurity removal in waste bio-oil are achieved. The equipment is compact in structure, greatly shortens the treatment flow of the waste bio-oil, and is high in separation efficiency and low in investment cost. Meanwhile, an automatic cleaning system controlled by a PLC (Programmable Logic Controller) is adopted, so that the backwashing efficiency of the equipment is improved, the operation period of the equipment is prolonged, and a plurality of problems caused by dehydration and impurity removal of the waste bio-oil at present can be solved by only utilizing one piece of equipment.

The invention relates to the technical field of switch cabinets, in particular to a high-low voltage switch cabinet with an overload protection function. Comprising a protective shell, the protective shell is provided with an intelligent control panel, a heat dissipation device is installed in the protective shell, a plurality of cabinet bodies are installed in the protective shell, and circuit breakers are arranged on the cabinet bodies; the multiple first moving plates are slidably connected to the protective shell, multiple second moving plates are slidably connected into the protective shell, and the first moving plates are located between the adjacent second moving plates and the protective shell; the first exhaust fan is mounted on the protective shell; and the first draft fan is mounted in the fixed pipe. According to the invention, through the combined action of the first draft fan and the first exhaust fan, when the heat dissipation device in the protection shell breaks down, gas in a static state in the protection shell is switched into a flowing state, and emergency heat dissipation processing is carried out on the interior of the protection shell, so that normal use of each electrical element on the cabinet body is ensured.

A continuous oxidation reaction process of o-xylene chloride includes batching, continuous oxidation, tail gas condensation, flash distillation, acetic acid recovery, tail gas treatment and crude anhydride treatment steps. A bubbling reaction tower with a dehydration section and other matching equipment are used as a continuous o-xylene chloride liquid-phase air reaction device. The device, combined with the oxidation process of the invention, can continuously discharge the water generated during the reaction from the reaction system, greatly reduce the inhibitory effect of water on the reaction, and improve the product yield; at the same time, the device adopts a continuous feeding and discharging production mode to greatly improve the utilization efficiency of the reaction device, and avoid the frequent pressure increase and reduction, temperature increase and decrease of the reaction equipment caused by the intermittent process, which causes equipment fatigue damage.

The application discloses a method for detecting the effect of ground pre-grouting of a vertical shaft by using geophysical logging, before grouting, 1-3 grouting holes are selected and drilled to the designed depth; a geophysical logging system is arranged; the selected grouting holes are subjected to geophysical logging before and after grouting by using the geophysical logging system; the physical properties of the stratum reflected by the geophysical logging data of the grouting holes before and after grouting are compared and analyzed, the change trend of the water conductivity and stability of the grouted stratum is obtained, and the grouting water plugging and reinforcement effect is evaluated. The geophysical logging method is used for detecting the water plugging and reinforcement effect of the ground pre-grouting of a vertical shaft, and a simple and reliable evaluation method is provided, the defects of large hydrological test error and slow excavation measurement lag in the current evaluation method are overcome, the stratum condition information and guidance are provided for the grouting engineering construction, reliable basis is provided for the grouting engineering acceptance, and technical support is provided for the application of the ground pre-grouting technology of a vertical shaft and the safe and rapid construction of a vertical shaft.

The invention provides a film capacitor core winding device with a preheating treatment function and a method and application thereof, and belongs to the technical field of capacitor core winding. The film capacitor core winding device comprises a winding machine box, and a first pole piece roll, a second pole piece roll and a diaphragm roll are installed at different incoming material ends in the winding machine box respectively; a first pole piece and a second pole piece are respectively wound on the first pole piece roll and the second pole piece roll, a film is wound on the diaphragm roll, the first pole piece, the second pole piece and the film are respectively connected with a clamping and cutting device through a transmission device, and the first pole piece, the second pole piece and the film are connected with a roll core through the clamping and cutting device. Preheating temperature control devices are symmetrically mounted on the two sides of the first pole piece, the second pole piece and the film respectively, and a plurality of air supply devices are mounted on the top of the inner side of the winding machine box; the problems that moisture is difficult to remove after the film is wound, and the film is locally oxidized and damaged can be solved.

This application relates to the field of gas refining production, specifically disclosing a refining process for high-purity electronic-grade ammonia, comprising the following steps: S1, pretreatment: the raw material liquid ammonia is sequentially vaporized, filtered, and adsorbed to obtain crude ammonia; S2, ultrafiltration: the crude ammonia obtained in step S1 is ultrafiltered under conditions of pressure 0.4-0.8 MPa, temperature 25-45℃, and flow rate 1.5-3.5 m / s to obtain high-purity ammonia; S3, distillation and condensation liquefaction: the high-purity ammonia obtained in step S2 is sequentially distilled and condensed to obtain electronic-grade ammonia with a purity of 5N. The refining process of this application simultaneously meets the requirements of high purity, low cost, and high efficiency, improves the removal efficiency of trace impurities, and can obtain electronic-grade ammonia with a purity of 5N, solving the problems of insufficient purity, high impurity content, and high production costs in existing ammonia refining processes.

The invention relates to the technical field of medicine, and discloses a compound crystal form and a preparation method and application thereof, the compound has a structure shown in a formula (1), and the characteristic peaks 2 theta of an X-ray powder diffraction pattern of the crystal form comprise 4.60 degrees + / -0.2 degrees, 8.88 degrees + / -0.2 degrees, 9.74 degrees + / -0.2 degrees, 10.76 degrees + / -0.2 degrees, 12.00 degrees + / -0.2 degrees, 13.54 degrees + / -0.2 degrees, 16.86 degrees + / -0.2 degrees, 17.30 degrees + / -0.2 degrees, 21.08 degrees + / -0.2 degrees and 25.36 degrees + / -0.2 degrees; the purity change of the nucleoside with the specific crystal form is small along with the prolonging of the placement time, which indicates that the crystal form prepared by the method is not easy to deteriorate and is easy to store. The nucleoside with the specific crystal form has a higher melting point and lower water content and hygroscopicity. # imgabs0 #

The invention provides an anchor rod orifice leakage dredging and stopping method and system, and relates to the technical field of waterproof curtain anchor rod construction.The anchor rod orifice leakage dredging and stopping method comprises the following steps that a drainage pipe and a grouting pipe are arranged on the periphery of an anchor rod, the inner end of the drainage pipe and the inner end of the grouting pipe are both located in a soil body on the inner side of a waterproof curtain, and the inner end of the drainage pipe is deeper than the inner end of the grouting pipe; in the radial direction of the anchor rod, the distance between the grouting pipe and the anchor rod is smaller than the distance between the drainage pipe and the anchor rod; and then negative pressure pumping and drainage are conducted on the soil body through the drainage pipe, and grouting and leakage stopping are conducted on the soil body through the grouting pipe. Water in the to-be-reinforced soil body can be pumped out through the drainage pipe, then the soil body is reinforced through guniting, the leakage stopping purpose can be achieved, the drainage effect in the active drainage process is better, the water content in the to-be-reinforced soil body can be reduced, the situation that in the guniting process, the water cooperates with slurry to flow out of an anchor rod orifice, and leakage is avoided is avoided. And the soil body is difficult to reinforce.

The invention relates to a method for preparing lactide with different optical purities, belongs to the technical field of lactide preparation, and discloses a method for preparing lactide with different optical purities through multistage depolymerization, lactic acid oligomer is depolymerized, segmentation is carried out at least twice in the depolymerization process to obtain crude lactide with different m-lactide contents, and optionally, the crude lactide is separated from the crude lactide to obtain the lactide with different optical purities. And respectively purifying crude lactide with different contents of m-lactide. According to the invention, mixing of m-lactide and lactide with optical purity is reduced from the source, and lactide with different optical purity can be obtained as required; the method provided by the invention can obtain gt; according to the present invention, the lactide with the optical purity of 96% does not need the separation of m-lactide and L-lactide, such that the amount of the lactide crude product requiring the separation of m-lactide and L-lactide is substantially reduced, and the separation energy consumption is reduced.

The invention discloses a lithium battery diaphragm with low moisture and high circulation rate and a preparation method thereof, the lithium battery diaphragm comprises a base membrane and a coating on the base membrane, and the coating comprises polycrystalline mullite whiskers, barium sulfate and a binder. A staggered 3D network structure is generated between the barium sulfate and the polycrystal mullite whiskers, the polycrystal mullite whiskers can be interspersed among the barium sulfate, based on the network structure, water is more easily volatilized during diaphragm preparation, the water content of the diaphragm is reduced, the barium sulfate and the polycrystal mullite whiskers jointly adjust the porosity and pore size distribution of the diaphragm, and the diaphragm is more stable in performance. According to the present invention, the polycrystalline mullite crystal whiskers are added to form the ion moving channel so as to allow the ions in the electrolyte to pass through, such that the current blocking purpose is achieved, the battery use safety is ensured, the polycrystalline mullite crystal whiskers improve the ion conductivity of the diaphragm, the current density is increased, and the local overheating caused by the non-uniform current density is avoided.