33results about How to "Reduce entrainment" patented technology

The invention belongs to the field of medical isotope separation and preparation, and particularly relates to a method for separating and purifying < 212 > Pb from a thorium solution, which comprises the following steps: 1) leacheate is introduced into a Pb selective adsorption column to pretreat the Pb selective adsorption column, and then < 232 > Th salt solution and leacheate are introduced in sequence; 2) continuously introducing a desorption solution into the Pb selective adsorption column, enabling the desorption solution passing through the Pb selective adsorption column to flow into the Th selective adsorption column, and collecting the outflowing desorption solution; a desorption solution only containing 212Pb is obtained; according to the method, the 212Pb in the high-concentration thorium solution can be separated and purified at the same time. While < 232 > Th impurity entrainment and pollution in a < 212 > Pb product are remarkably reduced, compared with a single-column process, the separation time is basically not increased. The separated 212Pb product has high radionuclide purity and chemical purity at the same time, and can meet related pharmaceutical requirements.

This invention discloses a method for preparing high-purity oxygen-free copper, relating to the field of metallurgical technology. The method includes multi-stage electrolytic refining, gradient-heating vacuum melting, inert gas-protected refining, electron beam melting, hydrogen plasma arc melting, directional solidification, and post-treatment steps. The multi-stage electrolytic refining utilizes a specific component electrolyte and periodically commutated current; vacuum melting is combined with bidirectional electromagnetic stirring; inert gas-protected refining is combined with a gradient reduction composite covering agent; electron beam and hydrogen plasma arc melting achieve deep purification and deoxidation; and directional solidification and two-stage annealing ensure product performance. The high-purity oxygen-free copper prepared by this invention has a conductivity of 102.3% IACS, a copper content ≥99.9999%, and an oxygen content <1.0 ppm. It exhibits high purity, low oxygen content, and excellent conductivity. The process is stable and controllable, making it suitable for high-end electronics applications.

The utility model relates to a kind of for prothioconazole oxidation synthesis light heavy component automatic separation device, belong to chemical production technical field, including prothioconazole oxidation synthesis component phase tank, mixed liquor regulating valve, light component regulating valve, heavy component regulating valve, flowmeter, mixed liquor regulating valve, light component regulating valve, heavy component regulating valve, flowmeter are all set to prothioconazole oxidation synthesis component phase tank, prothioconazole oxidation synthesis component phase tank is provided with mixed liquor feed inlet, light phase outlet, heavy phase outlet, blow-off, the utility model, optimization tank body structure realizes unpowered high-efficiency separation, reduce equipment cost, improve separation precision and product purity, by phase tank stratification structure optimization, light / heavy phase outlet height difference design and valve control, to effectively reduce entrainment rate, interface height and flow are monitored in real time, dynamically regulate valve opening, when heavy component proportion increases, automatically increase heavy component valve opening, to effectively reduce artificial dependence.

The utility model belongs to the technical field of automobile part casting molds, and provides an integrated semi-solid magnesium alloy high-pressure casting mold for a new energy automobile, which comprises a movable mold assembly, a fixed mold assembly, a sliding block mechanism, a sealing assembly, an exhaust assembly and a pouring system, the sealing assembly is arranged between the movable mold assembly and the fixed mold assembly, a sealing cavity is formed between the movable mold assembly and the fixed mold assembly, a product cavity is further formed between the movable mold assembly and the fixed mold assembly, and the product cavity comprises three cavities used for forming a first main body part, a second main body part and a third main body part respectively; the sliding block mechanism is arranged on the movable mold assembly; the exhaust assembly comprises an exhaust part; the pouring system comprises a pouring gate. Compared with the prior art, the pouring gates are asymmetrically distributed along the product cavity, semi-solid magnesium alloy slurry can be guided to be filled in a stable laminar flow state, air entrapment, turbulent flow and impact are reduced, the defects of cold shut and shrinkage porosity of products are reduced, and the forming precision and mechanical property of the integrated vehicle-mounted decoration plate are improved.

The application provides a directional separation method of aluminum in anodic oxidation linear polishing liquid, and belongs to the technical field of wastewater treatment. The directional separation method of aluminum in anodic oxidation linear polishing liquid is a phosphoric acid-based polishing liquid, and comprises the following steps: S1. pumping the anodic oxidation linear polishing liquid containing aluminum ions into a reaction kettle, heating and maintaining the system temperature at 50-70 DEG C; S2. slowly adding a solid sodium salt precipitant to the polishing liquid under stirring, and the molar ratio of sodium ions in the sodium salt precipitant to aluminum ions in the polishing liquid is controlled to be 1.05-1.20; S3. maintaining the temperature and stirring state to react for 1-2 hours, then cooling the reaction kettle, reducing the system temperature to 15-25 DEG C, and standing and aging for 2-4 hours, so that aluminum ions are precipitated in the form of sodium-containing aluminum phosphate precipitate; and S4. performing pressure filtration solid-liquid separation on the mixed solid-liquid system after reaction, and the intercepted filter cake is the separated sodium-containing aluminum phosphate precipitate, and the obtained filtrate is a de-aluminum polishing regeneration liquid.

This invention belongs to the field of lithium-ion battery electrolyte material preparation technology, and provides a solid lithium hexafluorophosphate with low fine crystal content and its preparation method. The preparation method involves adding lithium fluoride to anhydrous hydrogen fluoride to form anhydrous hydrogen fluoride slurry. A portion of the anhydrous hydrogen fluoride slurry and phosphorus pentafluoride gas are fed into a primary continuous reaction crystallizer. The resulting slurry is subjected to low-temperature fractionation to form a first stream and a second stream. The second stream enters a secondary continuous growth crystallizer and continues to react with phosphorus pentafluoride gas, followed by solid-liquid separation to obtain a solid wet product and mother liquor. The first stream, another portion of the anhydrous hydrogen fluoride slurry, and a portion of the mother liquor enter a pre-conditioning section, and the resulting pre-conditioned stream is returned to the feed end of the primary continuous reaction crystallizer. The solid wet product is then subjected to low-temperature washing and programmed vacuum drying to obtain the final product. This method, through the combination of fractional reflux, mother liquor participation in pre-conditioning, and continuous growth processes, reduces fine crystal entrainment and improves particle size distribution stability.

The application discloses a method for extracting sodium glycolate from pesticide wastewater and belongs to the wastewater treatment field. After 2,4-D production wastewater is stirred after pH is adjusted to 3.0, the filtrate is collected by filtration, the pH of the filtrate is adjusted to 8.0, and the concentrated solution is obtained by concentration under reduced pressure. The concentrated solution, modified cyclodextrin and modified cellulose are mixed according to the weight ratio of 100:0.8-1.2:0.1-0.3, the first mixing and stirring are performed, the second mixing and stirring are performed after cooling, the third mixing and stirring are performed after cooling again, and the filter cake is collected. After the filter cake and deionized water are mixed and stirred, the filtrate is collected by filtration, and the sodium glycolate is obtained by vacuum drying of the filtrate. The application solves the problem of co-crystallization of sodium glycolate and sodium chloride, and improves the purity and yield of sodium glycolate.

This invention discloses a method for the continuous preparation of biodegradable copolyester PBST. The method includes: (1) esterifying terephthalic acid and 1,4-butanediol in a stirred vertical esterification reactor; (2) introducing the product of step (1), succinic anhydride, and 1,4-butanediol into the stirred vertical esterification reactor for further esterification; (3) introducing the product of step (2) into a pre-polymerization reactor for pre-polymerization; (4) introducing the product from the pre-polymerization reactor into a final polymerization reactor for final polymerization; and (5) introducing the product from the final polymerization reactor into a melt thickening reactor for melt thickening, so that the melt index of the reaction product reaches 1-20. According to the scheme of this invention, not only can high molecular weight aliphatic aromatic copolyesters be continuously prepared, but the tensile mechanical properties of the prepared PBST are also significantly better.

The invention provides a multi-kettle series continuous polymerization system and a production method, and relates to the technical field of chemical production equipment. The system comprises a plurality of polymerization kettles which are connected in series, the polymerization kettles are sequentially connected in series through overflow pipes, and at least one overflow pipe is arranged in each polymerization kettle; the overflow pipe extends downwards from the inside of the polymerization kettle and is led out from the bottom or the side wall of the lower part of the polymerization kettle, the overflow pipe of the previous-stage polymerization kettle is led to a feeding hole of the next-stage polymerization kettle, and the overflow pipe of the last-stage polymerization kettle is led to a post-treatment system; a potential difference exists between the adjacent polymerization kettles; and the overflow pipe forms an inclined angle between a part or all of the micro-branched pipe sections of the main body section in the polymerization kettle and a plumb line. Stable liquid level control and stable material transmission are achieved through a pure mechanical overflow pipe structure, an interstage pump and a complex detection control instrument are not needed, and equipment investment, maintenance cost and energy consumption are reduced; the material flows downwards naturally, gas-liquid entrainment is reduced, the pressure fluctuation resistance is high, and operation is stable and reliable.

This invention relates to the field of ore flotation technology, specifically a low-consumption, high-efficiency flotation reagent for high-calcium, fine-muddy fluorite ore, its application, and a flotation method. The flotation reagent includes a modifier, a compound depressant, a compound collector, and a frother. The modifier includes sodium carbonate; the compound depressant includes water glass, carboxymethyl starch, sodium hexametaphosphate, and sodium lignosulfonate; the compound collector includes oleic acid, oxidized paraffin soap, sodium dodecyl sulfonate, and benzoyl hydroxamic acid; and the frother includes pine oil. Through the complementary functions of the compound depressant and the compound collector, highly efficient selective inhibition of high-calcium gangue and highly selective collection of fluorite are achieved, effectively dispersing fine mud, reducing froth entrainment, and ultimately obtaining a fluorite concentrate with a stable grade ≥97.0%, meeting the quality requirements of metallurgical and acid-grade fluorite products. This reduces the negative impact of fine nuclei on flotation, stabilizes the fluorite recovery rate, and increases the fluorite recovery rate by 3-6%, achieving dual stability in grade and recovery rate.

The utility model relates to air conditioning technical field discloses a device for fluorine system comfort air conditioner air outlet temperature rise, including the organism, the bottom equidistance of organism installs a plurality of silencing mechanism, the silencing mechanism is used for reducing the noise of air outlet, the bottom equidistance of organism installs a plurality of cover mechanism, the cover mechanism is used for the size of the size of the area of covering, the silencing mechanism includes the long hollow board, the long hollow board equidistance is installed in the bottom of organism, the bottom fixed connection of long hollow board has the supporting plate, the outer wall adjacent side fixed connection of supporting plate has the long rod. In the utility model, through piston rod reciprocating movement, compressed air and slowly discharge, reduce the noise frequency, thereby avoided the problem that the air conditioning air outlet wind force will produce bigger noise when blowing, the personnel body in the air conditioning surrounding area for a long time will produce the problem of discomfort.

The utility model relates to the field of refrigerator waste gas treatment, in particular to a heat storage type incinerator system for refrigerator broken waste gas treatment, which comprises a bag-type dust collector, a heat storage combustion furnace and an absorption tower, the bag-type dust collector is connected to the bottom of the heat storage combustion furnace through a waste gas guide pipe, and a liquid guide pipe is arranged at the bottom of the heat storage combustion furnace; the liquid conduit is connected to the absorption tower, the bag-type dust remover comprises a dust removal chamber and a dust removal barrel, the dust removal chamber is provided with dust removal cloth, the dust removal barrel is mounted at the bottom of the dust removal chamber, the waste gas conduit is connected to the top of the dust removal barrel, waste gas is fed into the heat storage combustion furnace through the blower, and the heat storage combustion furnace is connected to the bottom of the absorption tower through the gas conduit; the absorption tower is provided with a filling layer which is provided with a plurality of filling holes; a liquid sprayer is arranged at the top of the filling layer and is used for spraying a sodium hydroxide solution; the top of the absorption tower is connected with an exhaust chimney through an exhaust conduit. The device has the effect of reducing equipment corrosion caused by waste gas.

The invention discloses a graded absorption and purity improvement coupling system for ester exchange reaction ethylene glycol extraction liquid, and relates to the technical field of separation and purification of biological medicine chemical raw materials. Comprising an extraction liquid pretreatment module, a countercurrent grading absorption module, a purity improvement coupling module, a solvent recycling module and an environment-friendly terminal treatment module which are sequentially connected along the material flow direction, and an intelligent cooperative control module for monitoring and optimizing the whole system. In the invention, in the aspect of separation and purification, the system adopts a light-to-heavy gradient absorption strategy and a rectification-membrane separation coupling process, so that the thermodynamic limitation of a traditional single separation means is broken through, and high-precision purification of a carboxylic ester product and efficient selective recovery of ethylene glycol can be synchronously realized; therefore, the final purity of the target product is greatly improved, the target product can meet the harsh standard in the high-end application field, and the volatilization loss of light components and the entrainment of ethylene glycol are remarkably reduced by optimizing the mass transfer process.

The present application relates to a kind of vane and impeller with the vane, vane includes vane body, the front end of the vane body is vane leading edge, rear end is vane trailing edge;The thickness of the vane body is gradually increased thick gradually decreasing from vane leading edge to vane trailing edge, and form a smooth vane body;The maximum camber position of the cross section of the vane body is located at 25%-75% of vane chord length.The vane of the present application can effectively save material and reduce noise by changing the maximum camber position of vane cross section and using front bending and rear sweep form.

The application relates to the technical field of wastewater treatment, and particularly discloses a high-efficiency recovery and biochemical carbon source method for sodium acetate in acephate wastewater. The high-efficiency recovery and biochemical carbon source method for sodium acetate in acephate wastewater comprises the following steps: solvent recovery, high-temperature hydrolysis, methanol recovery and evaporation concentration are performed on acephate wastewater to obtain a salt-containing concentrated mother liquor and condensate water A; the salt-containing concentrated mother liquor is subjected to centrifugal separation to separate out a mixed salt containing sodium sulfate and sodium phosphate, and a salt-separated mother liquor is obtained; the salt-separated mother liquor is continuously cooled and crystallized to obtain a crystal slurry containing sodium acetate crystals; the crystal slurry containing the sodium acetate crystals is subjected to centrifugal separation to obtain a sodium acetate product and a crystallization mother liquor; part of the crystallization mother liquor is returned to a sodium acetate crystallization system to adjust the solid content of the crystal slurry, and the other part is subjected to drying treatment to obtain a mixed salt and condensate water B; the condensate water A and the condensate water B are sent to a biochemical system for treatment, and treated water is obtained.

This utility model relates to the field of esterification reaction technology, and more particularly to a reactive distillation column for esterification. The technical solution includes a column body with multiple inspection ports on the front for subsequent maintenance. Each inspection port has a closure door on its front. The column body contains multiple trays for providing a gas-liquid interface. Each tray has multiple gas riser holes on its surface. The top of each tray has multiple trapezoidal protrusions to increase the mass transfer area. Above the trays are multiple sets of arc-shaped baffles to reduce mist entrainment. Each set of trapezoidal protrusions has gas-phase injection holes inclined at 45 degrees on both sides. This utility model, through the arrangement of trapezoidal protrusions, gas-phase injection holes, and arc-shaped baffles, can force intense turbulence between the gas and liquid phases within the gaps between the protrusions, increasing the mass transfer area and improving separation efficiency. Simultaneously, it can utilize the principle of inertial collision to capture the liquid phase in the gas phase, reducing mist entrainment and improving product purity.

The utility model discloses a flue gas dedusting and desulfurizing device which comprises a tank body, a rotational flow plate assembly, a rotary packing assembly and a fixed packing assembly are sequentially arranged in the tank body from bottom to top, a rotating shaft is rotatably arranged in the tank body, the rotational flow plate assembly and the rotary packing assembly are both fixedly connected to the rotating shaft, and the bottom end of the rotating shaft penetrates through the inside and the outside of the tank body. The side wall of the bottom of the tank body is communicated with an air inlet pipe, the top of the tank body is communicated with an exhaust pipe, a flow guide assembly is arranged between the rotational flow plate assembly and the rotary filler assembly, a first liquid distributor is arranged in the center of the rotary filler assembly, and a second liquid distributor is arranged above the fixed filler assembly. The first liquid distributor and the second liquid distributor are connected with the liquid storage tank through a circulating pipe, and a circulating pump is arranged on the circulating pipe. After the rotational flow plate assembly, the rotary filler assembly and the fixed filler assembly are arranged in the tank body for three-stage collaborative desulfurization, the desulfurization efficiency can be effectively improved, and the occupied area is reduced.

The invention relates to a spraying system for removing sediments in a pre-condenser in naphthalene-process phthalic anhydride production, and relates to the technical field of naphthalene-process phthalic anhydride production, the spraying system comprises a pre-condenser body, a gas-liquid separation device, a crude phthalic anhydride intermediate tank and a switching condenser, the surface of the pre-condenser body is provided with a first conveying pipe, and the first conveying pipe is provided with a second conveying pipe; a filtering assembly is arranged on the surface of the first conveying pipe, a connecting pipe is arranged at the other end of the first conveying pipe, the other end of the connecting pipe is arranged on the surface of the gas-liquid separation device, and a liquid phase pipe and a gas phase pipe are arranged on the surface of the gas-liquid separation device; by integrating the pre-condenser body, the gas-liquid separation device, the crude phthalic anhydride intermediate tank and the switching condenser, a complete gas-liquid separation and circulating spraying system is constructed, the efficiency and stability of the crude phthalic anhydride condensation process can be remarkably improved through the synergistic effect of all the components, and gas and liquid can be efficiently separated and impurities can be intercepted through the combination of the gas-liquid separation device and the filtering assembly.

The utility model relates to a kind of energy storage box-type substation, including box, top of box is provided with top cover, fan is provided in top cover, top cover is opened with air outlet, first air inlet is opened on the side plate of box, dustproof box is located in the first air inlet side and is attached to the dustproof box inside wall in box is provided, vertical baffle is provided in dustproof box, baffle will dustproof box internal space be divided to form with first air guide cavity and second air guide cavity, the lower part of the side plate of dustproof box close to the inner wall of box is opened with second air inlet, so that first air guide cavity is communicated with first air inlet, third air inlet is opened in the upper portion of baffle, which is communicated with first air guide cavity and second air guide cavity, the lower part of the side plate of dustproof box away from the inner wall of box is opened with fourth air inlet, so that second air guide cavity is communicated with the inside of box. This energy storage box-type substation reduces the accumulation of dust in the box by the dustproof effect of dustproof box, ensures the long-term normal operation of the power distribution equipment in the box, and the dustproof structure has low cost and does not need maintenance.

The present application relates to a kind of collector for spodumene and its preparation method and flotation method, specifically to the field of flotation reagent technology, the collector includes: castor oil acid salt, potassium lauryl polyether phosphate, laurylimino diacetic acid disodium, phosphate betaine, alcohol ether, caustic alkali and solvent.The collector provided in the present application, by the synergistic adsorption of carboxylate of castor oil acid salt and phosphate ester group of potassium lauryl polyether phosphate and phosphate betaine to activated spodumene realizes strong collection, and by imino diacetate and phosphate betaine structure regulation selectivity, dispersibility and foam property, so as to improve the flotation separation effect of spodumene and quartz, feldspar, mica and other gangue minerals.

The invention relates to the technical field of mine beneficiation, and discloses an optimization method and system for a precious metal ore beneficiation process, according to the method, in the primary beneficiation link of precious metal ore, a combined process of a jaw crusher, a vibrating screen, a jigger, an auxiliary screening device and an intelligent regulation and control system is adopted to improve the recovery rate of fine-fraction minerals, the jaw crusher completes coarse crushing, the vibrating screen achieves size fraction grading, the jigger separates target minerals and gangue based on gravity difference, the basic separation requirements of small and medium-sized mines are jointly met, the optimized technology is used for auxiliary screening and secondary recovery of a shaking table, an intelligent regulation and control system replaces manual experience, and the working efficiency is improved. The stability and continuity of sorting can be effectively guaranteed; by means of the refined screening process design, the overall screening precision and the quality of qualified materials are improved, and on the basis that original process equipment is simple, energy consumption is low and investment cost is controllable, the screening precision is optimized by adjusting intelligent sorting parameters in a self-adaptive mode, and meanwhile the system stability is maintained.

The utility model discloses a rice husk grain extractor for grain processing, which relates to the technical field of grain processing equipment and comprises a shell, a feed hopper connected onto the shell and a rice husk feed auger rotationally connected into the shell, a multi-stage separation component used for separating rice husks from inferior grains is arranged below the rice husk feed auger, and the rice husk and inferior grains are separated by the multi-stage separation component. The multi-stage separation assembly comprises a first shedding plate which is rotationally connected into the shell and used for loosening rice husks for the first time, and a second shedding plate is rotationally connected into the shell and located below the first shedding plate; after rice husks enter equipment through the feeding hopper, the rice husk feeding auger is matched with the frequency converter, the rotating speed can be flexibly adjusted according to actual requirements, and the rice husks are evenly distributed. By means of the design, the problem that a feeding layer is not uniform is effectively avoided, unstable air speed caused by non-uniform feeding is avoided, and then the phenomenon that inferior grains are lost or entrained is reduced.

The invention discloses a method for recovering lithium from industrial-grade lithium carbonate mother liquor, and aims to provide a method for recovering lithium from industrial-grade lithium carbonate mother liquor, the method not only can recover lithium, but also can obtain by-product daily chemical-grade sodium sulfate, and in the recovery process, reagents such as an extracting agent, an adsorbent and phosphate are not used, so that the method is environment-friendly and energy-saving. Therefore, the resource and energy consumption is reduced in the production process; the lithium precipitation mother liquor used in the technical scheme is the lithium precipitation mother liquor of industrial-grade lithium carbonate, the concentration of the concentrated lithium liquor is improved and anhydrous sodium sulfate is produced by adjusting acid and alkali to remove carbon and evaporating and concentrating, and the quality of the byproduct daily chemical-grade anhydrous sodium sulfate is ensured by washing and drying; the concentrated lithium liquid is cooled again to separate out residual sodium sulfate decahydrate, so that the lithium concentration in the lithium liquid is improved, then sodium carbonate is added to precipitate lithium carbonate, and industrial-grade lithium carbonate is obtained after washing and drying; belongs to the technical field of waste liquid recovery.

The utility model discloses a novel tray for rectification, including tray mechanism, the top of tray mechanism is provided with shunt mechanism and overflow weir, and shunt mechanism and overflow weir are located at both sides of tray mechanism respectively, and the below of tray mechanism is provided with the liquid fall guide plate at the one side of overflow weir. The utility model discloses through the sieve hole in tray mechanism adopts the center hole diameter less than the edge hole diameter and with the center twist five degrees, cooperation twist pipe structure, can balance the gas velocity of different area of tray, reduce local turbulence excessive concentration, reduce the entrainment phenomenon of mist, thereby promote the contact evenness and mass transfer efficiency of gas liquid two -phase, in addition, through the eccentric wheel drive push liquid plate reciprocating motion of the poking subassembly in shunt mechanism, make the directional disturbance of liquid layer on the top of tray, increase gas liquid contact probability.

The utility model provides an anti-coking device for a settler, which belongs to the technical field of settler plates and comprises an overflow hopper arranged at the lower part of a coarse spinning dipleg and positioned at the inner bottom of the settler; an upper overflow opening is formed in the top end of the overflow hopper, a lower overflow opening is formed in the bottom end of the overflow hopper, and the lower portion of the rough spinning leg extends into the overflow hopper through the upper overflow opening; a superheated steam fluidization ring pipe is arranged at the inner bottom of the overflow hopper, and a nozzle is arranged on the superheated steam fluidization ring pipe; the superheated steam fluidization loop pipe is connected with a steam pipeline, one end of the steam pipeline is connected with the superheated steam fluidization loop pipe, and the other end of the steam pipeline penetrates through the overflow hopper and then is connected with a fluidization steam inlet formed in the upper portion of the settler. Through the measures of reasonable structural design, accurate flow control, wear resistance, condensation prevention and the like, oil gas entrainment can be effectively reduced, catalyst accumulation and coking are prevented, the separation efficiency is improved, the structural strength is high, maintenance is convenient and fast, and the operation cost is reduced.

This application relates to the field of phosphoric acid preparation technology, and more particularly to a method for preparing industrial-grade phosphoric acid based on hydrochloric acid decomposition of phosphate rock. The method includes: pulping phosphate rock to obtain a phosphate rock slurry; acidifying the phosphate rock slurry with hydrochloric acid to obtain an acid-hydrolyzed slurry; filtering the acid-hydrolyzed slurry to obtain an intermediate filter material; extracting the intermediate filter material using a composite extractant to obtain calcium chloride product and a supported organic phase; and reverse-extracting the supported organic phase with water to obtain dicalcium phosphate product and industrial-grade phosphoric acid. The extraction is performed in a rotary microchannel device. The composite extractant comprises a mixed organic phase of trioctylamine, tributyl phosphate, and triethylamine in decreasing mass concentrations. This method, through the synergistic effect of multi-stage gradient impurity removal throughout the entire process and deep purification by a core innovative unit, improves the purity and yield of phosphoric acid produced by wet acid hydrolysis from three dimensions: pre-removal of impurities at the source, selective separation of core soluble impurities, and precise interception of trace impurities at the terminal stage, while achieving full recovery of phosphate rock.

This invention discloses a high-pressure gas-liquid separation and return device, comprising a first high-pressure tank and a second high-pressure tank. The first high-pressure tank has an inlet pipe at its top, extending to its bottom. Inside the first high-pressure tank, from top to bottom, are arranged a three-stage gradient sintered filter element, a baffle plate, and a flow deflector. The upper part of the first high-pressure tank is connected to the second high-pressure tank via a gas pipe. The second high-pressure tank has a fiber filter surface, an outlet at its top, and a liquid return port at its bottom. This device has a compact structure, can operate efficiently under high pressure, exhibits excellent separation efficiency, significantly reduces liquid entrainment, and meets the high-pressure gas-liquid separation requirements of many fields such as chemical engineering and energy.

The application relates to a low-temperature concentration method for reducing crystallization entrainment. The low-temperature concentration method for reducing crystallization entrainment described in the application introduces small-molecule gas to form hydrate crystal nuclei or small crystals to serve as the crystal seeds of the freeze concentration before the stage of the freeze concentration crystallization phase change, can reduce the freeze concentration crystallization supercooling degree, and promotes the freeze concentration to occur. In the stage of the freeze concentration phase change, the gas is continuously introduced to enhance the heat transfer, increase the nucleation points, promote the crystallization to occur, form more small ice crystals, effectively reduce the generation of large ice crystals, and reduce the entrainment rate. Compared with single freeze concentration, the low-temperature concentration method for reducing crystallization entrainment adopting the embodiment of the application saves time by more than 10%, reduces the ice crystal entrainment rate by more than 10%, and improves the quality by more than 15%.

The invention relates to a method for preparing potassium sulfate and sodium sulfate by fully utilizing lithium extraction residual liquid. The method comprises the following steps: (1) performing first evaporation concentration crystallization on the lithium extraction residual liquid to obtain an anhydrous sodium sulfate product and first crystallization filtrate; (2) cooling and crystallizing the first crystallization filtrate obtained in the step (1) to obtain mirabilite and a second crystallization filtrate; (3) carrying out second evaporation concentration crystallization on the second crystallization filtrate obtained in the step (2) to obtain a crude potassium sulfate product and a third crystallization filtrate; (4) mixing the crude potassium sulfate product obtained in the step (3), a calcium additive and water, and carrying out precipitation reaction to obtain double salt precipitate and post-precipitation liquid; and (5) mixing the double salt precipitate obtained in the step (4) with water, carrying out a dissolution reaction, filtering after the reaction to obtain a filtrate and a calcium precipitate, and carrying out third evaporation, concentration and crystallization on the filtrate to obtain a high-purity potassium sulfate product. According to the method, full-quantitative recovery of sodium and potassium in the lithium extraction residual liquid and preparation of high-value products are realized, and the economic value is good.

The application discloses a disc separator system and a deslagging method based on digital twinning, and relates to the technical field of disc separator control. The method comprises the following steps: in response to receiving solid content distribution data of a physical disc separator mapped in a virtual space, generating an initial deslagging trigger signal according to a solid phase accumulation area and a rotating drum speed; extracting a fluid velocity gradient field from a separator dynamic model and performing boundary erosion processing on the solid content distribution data according to the initial deslagging trigger signal to obtain a dynamic solid content boundary layer; determining deslagging port selection parameters and locking a target deslagging port according to a thickness change rate of the dynamic solid content boundary layer and a real-time fluctuation value of the rotating drum speed; and generating a staged deslagging timing instruction according to a pressure accumulation curve and issuing the instruction to an executing mechanism. The application realizes accurate triggering of a deslagging process, adaptive selection of a deslagging port and fine control of a deslagging timing through digital twinning technology.