4355results about "Solution crystallization" patented technology

The invention relates to the technical field of parameter adjustment, and discloses a low-temperature evaporative crystallization machine parameter adjustment method, device and equipment and a storage medium, and the method comprises the steps: collecting M groups of temperature sensor data and N groups of pressure sensor data of a low-temperature evaporative crystallization machine, calculating a first uncertainty representation of temperature parameter measurement and a second uncertainty representation of pressure parameter measurement; performing data fusion to obtain an optimal estimated value of a temperature state and an optimal estimated value of a pressure state; parallel prediction is carried out through the thermodynamic equilibrium model, the crystallization kinetic model and the system response model, and a crystallization process prediction result is obtained; according to the technical scheme of the invention, the interference of the feeding fluctuation, the environmental change and the like can be effectively handled, and the real-time updating of the control strategy and the accurate adjustment of the temperature and pressure parameters can be realized.

The invention relates to the technical field of grease production control, in particular to a grease product production control method and system based on intelligent digitization. The method comprises the following steps: monitoring temperature, viscosity and turbidity data in a grease crystallization process in real time, and generating grease crystallization state snapshot data; performing crystallization state prediction according to the grease crystallization state snapshot data, and performing reaction kettle cooling rate adjustment to obtain a target control cooling rate; performing real-time stirring rotating speed adjustment fuzzy reasoning on the grease crystallization state snapshot data to generate a corrected grease stirring speed; and performing control instruction conversion on the target control cooling rate and the corrected grease stirring speed, executing a production control instruction, and generating a grease crystallization process control report. By accurately controlling the cooling rate and the stirring speed, intelligent control over the grease crystallization process is achieved, and the quality and stability of grease products are remarkably improved.

The invention provides a sulfamic acid continuous crystallization production device and process, the sulfamic acid continuous crystallization production device comprises a filter box and a production box, the production box is fixedly connected to the upper surface of the filter box through bolts, the top end of the production box is provided with a feeding pipe, the middle part of the interior of the production box is provided with a partition plate, and the middle part of the partition plate is provided with a conveying pipe; a discharging pipe, a production reaction module and a filtering and cleaning module are arranged between the production box and the filtering box. According to the sulfamic acid continuous crystallization production device and the sulfamic acid continuous crystallization production process, in the sulfamic acid continuous crystallization production process, when sulfamic acid crystals are filtered out from mother liquor through the filter cartridge, purified water is sprayed into the filter cartridge through the spray head; and the sulfamic acid crystals can be quickly and uniformly washed to remove impurities through the filter cartridge which continuously shakes in a reciprocating manner in the rotating process, so that the continuous crystallization production efficiency of the sulfamic acid can be effectively improved.

The invention provides a continuous preparation system and method of pyroxasulfone. The continuous preparation system comprises a mixing device, a continuous oxidation reaction device, a continuous quenching device, a continuous devitrification device, a continuous solid-liquid separation device and a continuous drying device. Compared with intermittent preparation of pyroxasulfone, the continuous preparation system disclosed by the invention has the advantages that the reaction can be more stable, and the reaction temperature can be more accurately controlled, so that the problems of large heat release and high process risk in batch reaction can be effectively solved. Moreover, compared with a tank reactor, the continuous oxidation reaction device filled with the catalyst bed layer can improve the oxidation reaction rate, shorten the oxidation reaction time and improve the yield and selectivity of oxidation products.

The invention discloses a p-methyl benzyl chloride production process and a production system thereof, p-xylene side chains and chlorine are subjected to a gas phase substitution reaction under micro negative pressure and visible light catalysis to generate crude methyl benzyl chloride and hydrogen chloride, and 99.0% methyl benzyl chloride, a small amount of benzyl dichloride and 31% hydrochloric acid are respectively generated through rectification and absorption; the device consists of four working sections of chlorination, rectification, hydrochloric acid absorption and distillation. According to the method, the defects in the prior art are overcome, on one hand, chlorine is introduced, and an aromatic ring chlorination reaction is carried out under visible light catalysis; on one hand, a supported catalyst filler is arranged at the bottom of a chlorination tower, and a zeolite molecular sieve modified by long-chain alkylsilane and supported by metal salt is used as a catalyst to catalyze chloromethylation reaction, on the other hand, the hydrophobicity of the modified catalyst is obviously enhanced, and meanwhile, the density of acidic sites is not reduced; the contact opportunity of the catalyst and a reaction substrate is greatly increased, and the catalytic efficiency of the catalyst is improved.

The invention relates to a crystallization method of ammonium metavanadate crystals. The crystallization method comprises the following steps: cooling an ammonium metavanadate concentrated solution to obtain an ammonium metavanadate supersaturated solution; the cooling treatment process comprises the step of adding a crystallization regulating agent into the ammonium metavanadate concentrated solution; sequentially carrying out aging treatment and solid-liquid separation on the ammonium metavanadate supersaturated solution to obtain an ammonium metavanadate solid phase; by adding a crystallization regulating agent in the cooling treatment process, regulating the growth rate and growth direction of ammonium metavanadate crystals, matching with the steps of aging treatment and the like, the crystallization rate of the crystallization method is improved, preferably, the crystallization rate is up to 89.5% or above, and the high-purity ammonium metavanadate product with large grain size and regular morphology is obtained. Wherein the median particle size preferably reaches up to 86.5 microns or above, the purity reaches up to 99.97% or above, and the requirement for high-quality vanadium products at present is met.

The invention relates to the technical field of equipment management and control, in particular to an evaporative crystallization equipment operation management and control system and method based on multi-modal perception, and the system comprises a raw material characteristic analysis module, a temperature regulation and control module, a heating time adjustment module and an equipment maintenance management module. According to the method, the energy utilization efficiency and the raw material conversion rate are optimized by analyzing the characteristics of the raw materials and adjusting the heating temperature in the evaporative crystallization process, the energy utilization efficiency is improved by monitoring the time change of the quality of the raw materials, evaluating the evaporation rate of the raw materials and dynamically adjusting the heating time, and meanwhile, the energy consumption of equipment is reduced; by monitoring the power consumption, voltage and current data of equipment operation and combining the maintenance history of the equipment, the operation stability of the equipment can be accurately evaluated, the maintenance requirements of the equipment can be identified in time, faults can be prevented in advance, the long-term stable operation of the equipment is ensured, and the continuity and safety of the production process are ensured.

The invention provides a method for recovering a BHET monomer from a waste polyester textile alcoholysis solution, and is characterized in that the recovery method comprises the following steps: (1) filtering: mixing the waste polyester textile alcoholysis solution with water under a stirring condition, and filtering at 55-70 DEG C; and (2) cooling crystallization: under a stirring condition, carrying out primary cooling on the filtrate obtained by filtering in the step (1) from 55-70 DEG C to 45-55 DEG C, then adding a BHET seed crystal, then carrying out secondary cooling to 5-15 DEG C, and maintaining the temperature for 20-60 min to obtain the BHET monomer. The mixed solution cooling crystallization method is developed on the basis of complexity of components of the waste polyester textile fabric, the problems that in the conventional production process, a BHET crystal product is low in quality, prone to scaling, difficult to filter and dry and the like are solved, and the obtained BHET product is large in particle size, narrow in particle size distribution, high in purity, good in fluidity and high in stability.

The invention belongs to the technical field of freeze concentration, and relates to a freeze concentration device which comprises a dissolving assembly and a gas treatment assembly, a filtering element is arranged in the dissolving assembly and divides the dissolving assembly into an upper part and a lower part, the upper part of the dissolving assembly is used for loading crushed solids, and the lower part of the dissolving assembly is used for loading a solution obtained by dissolving; the gas treatment assembly comprises gas drying equipment, gas temperature adjusting equipment and a fan which are connected in sequence; a gas inlet is formed in the side wall or the top of the upper portion of the dissolving assembly and connected with a fan outlet, and a gas outlet is formed in the side wall of the lower portion of the dissolving assembly. Dry gas entering from the gas inlet serves as an energy medium, penetrates through broken solids on the upper portion of the dissolving assembly, conducts heat transfer and then is discharged from the gas outlet in the lower portion of the dissolving assembly, a dissolved solution enters the lower portion of the dissolving assembly through the filtering element, the solution is reserved in a segmented mode, and solutions with different concentrations are obtained. The freezing concentration of the dilute solution is realized.

The invention discloses a low-cost and environment-friendly process for producing 1, 4-bis (4-fluorobenzoyl) benzene, and belongs to the technical field of Friedel-Craft reaction, fluorobenzene and paraphthaloyl chloride react to generate 1, 4-bis (4-fluorobenzoyl) benzene, after reaction quenching, filtering is performed to obtain a crude product 1, 4-bis (4-fluorobenzoyl) benzene and filtrate, and the 1, 4-bis (4-fluorobenzoyl) benzene is purified in a sublimation crystallization mode; standing and layering the filtrate in an inclined plate layering device, respectively treating an oil layer and a water layer, dehydrating a fluorobenzene layer in a dehydrating tower, and returning fluorobenzene; the water phase is firstly subjected to organic matter removal treatment, the obtained organic matter enters a fluorobenzene recovery device to be sleeved back, and the obtained water phase is a byproduct of crystallized aluminum chloride in an evaporative crystallization device. According to the process, the 1, 4-bis (4-fluorobenzoyl) benzene is produced in a sublimation crystallization mode instead of a solution crystallization mode, no waste solvent is generated, the waste solvent does not need to be recycled, the cost is low, organic matter removal and evaporative crystallization treatment is carried out on wastewater, organic matter recycling is carried out, crystalline aluminum chloride is produced as a byproduct, and wastewater and waste salt are not discharged.

The invention discloses an evaporative crystallization device for high-purity anhydrous sodium sulphate, and relates to the technical field of anhydrous sodium sulphate processing, and the evaporative crystallization device is characterized by comprising an evaporation tank and a spraying and scraping mechanism, the spraying and scraping mechanism is arranged on the evaporation tank and comprises a spraying pipe, a spraying head, a vertical shaft, a cross arm, a scraping plate and a driving assembly, the spraying pipe is rotationally connected with the evaporation tank, the spraying head is installed at the end, located in the evaporation tank, of the spraying pipe, a spraying opening of the spraying head faces the inner side wall of the evaporation tank, and the spraying pipe is fixedly connected with the vertical shaft; the vertical shaft is fixedly connected with a plurality of cross arms, the cross arms are fixedly connected with a scraper blade, and the scraper blade is in friction contact with the inner wall of the evaporation tank; the driving assembly drives the spraying pipe and the spraying head to rotate, when a solution sprayed by the spraying head makes contact with the high-temperature inner side wall of the evaporation tank, water in the solution can be rapidly evaporated, and therefore separation of sodium sulfate crystals in the solution is accelerated, and the evaporation and crystallization efficiency is effectively improved.

The invention discloses a method for purifying p-dioxanone by coupling vacuum distillation with solution crystallization, which comprises the following steps of: firstly, removing light and heavy impurities from a p-dioxanone crude product in a vacuum distillation manner; and the rectified and purified p-dioxanone enters a crystallizer to be subjected to solution crystallization operation to obtain high-purity p-dioxanone, and crystallization mother liquor is returned to vacuum rectification after the solvent is removed.

The invention relates to a continuous oscillatory flow crystallization device with a V-shaped connecting pipe structure. According to the technical scheme, the device specifically comprises a tubular crystallizer assembly of a V-shaped connecting pipe structure, an oscillatory flow pump driving mechanism, a feeding mechanism, a discharging mechanism, a circulating cooling mechanism and an intelligent control system. Through the structural design of the V-shaped connecting pipe, periodic circulation can be formed in the chamber, the radial mixing strength is remarkably enhanced, the impact force of fluid on the wall surface is increased, and a heat transfer boundary layer is thinned, so that the technical bottleneck of non-uniform crystal suspension at a high solid-to-liquid ratio is effectively solved, and heat transfer and mass transfer in the continuous crystallization process can be enhanced; no stirring paddle or moving mechanical part is arranged inside, so that suspended crystal particles are effectively prevented from being broken and nucleated; and in the nucleation dominant area, through alternate cooling crystallization and heating dissolution operation, crystal scales on the pipe wall and fine grains in the mother liquor can be dissolved, and the number of crystal nucleuses in the crystallization mother liquor can be regulated and controlled, so that controllable production of expected particle size distribution of a crystallization product is realized, and the problem of scaling on the pipe wall is effectively solved.

The invention relates to the technical field of automatic control, in particular to a monitoring method and system for synthesizing ceramide based on alpha-hydroxy fatty acid, and the monitoring system for synthesizing ceramide based on alpha-hydroxy fatty acid comprises a raw material feeding module, a reaction control module, a quenching-crystallization joint control module and a data integration module; carrying out dynamic weighing monitoring on the raw materials based on the received synthesis instruction, and starting a reaction kettle according to weighing data; performing multi-dimensional data acquisition in real time according to the set reaction data, and performing dynamic feeding control according to the set reaction data; when the TLC detection substrate reaction is completed, the cooling process and the crystallization process are regulated and controlled in real time according to the reaction data until the end point judgment standard is met; according to a received synthesis completion instruction, product quality data is obtained, a monitoring data packet is generated, the synthesis instruction is marked and then stored, process control is accurately monitored and controlled, and the purity and crystal form of the product are ensured.

The invention provides a method and system for salt separation, evaporation and crystallization of printing and dyeing wastewater, and the method comprises the following steps: sequentially carrying out multi-stage synergistic pretreatment on textile printing and dyeing wastewater to remove suspended solids, degrade organic matters and reduce hardness; the pretreated wastewater is subjected to membrane salt separation treatment, and preliminary separation of salt is achieved through reverse osmosis pre-concentration and nanofiltration salt separation; and respectively carrying out evaporative crystallization treatment on the separated high-concentration salt solution to obtain high-purity sodium sulfate and sodium chloride products. According to the method, the salt recovery rate and the product purity are remarkably improved, the energy consumption and the operation cost are reduced, meanwhile, the problems that in traditional printing and dyeing wastewater treatment, salt is difficult to separate, and the crystallization purity is low are solved, and an innovative solution is provided for high-valued resource recovery of industrial wastewater.

The invention discloses a lithium hexafluorophosphate crystallization and separation device, and relates to the technical field of lithium hexafluorophosphate crystallization and separation, the lithium hexafluorophosphate crystallization and separation device comprises a fixed seat and support legs symmetrically fixed on the periphery of the bottom of the fixed seat, the interior of the fixed seat is fixedly connected with an outer box body, and the lithium hexafluorophosphate crystallization and separation device further comprises an air inlet, an air outlet and an air outlet, an air outlet is formed in the other side of the top of the outer box body; the liquid outlet is formed in the middle of the bottom of the outer box body; the outer barrel body is installed in the outer box body, an inner barrel body is connected to the interior of the outer barrel body in a clamped mode, and a cleaning brush is installed on the lower portion of the partition plate; the swing mechanism is arranged on one side of the outer barrel; and the cleaning mechanism is arranged below the partition plate, and the problems that a lithium hexafluorophosphate solution in the device is in direct contact with the barrel for a long time, so that the barrel is easily corroded and damaged, and large lithium hexafluorophosphate crystals are still possibly contained in the device during discharging, so that the subsequent smooth discharging of the lithium hexafluorophosphate crystals is inconvenient are solved.

The invention discloses a process and equipment for producing special melamine by a gas phase quenching method. The production process comprises the following steps: hot process gas from an outlet of a melamine reactor is in contact with cold process gas in a crystallizer, a generated solid A is discharged from the bottom of the crystallizer, and mixed gas enters a trap for gas-solid separation to obtain a solid B; the solid A is conveyed into a high-pressure collecting device A through high-pressure conveying gas A, it is ensured that the temperature of the high-pressure conveying gas A is higher than 120 DEG C in the conveying process, after gas-solid separation is conducted in the high-pressure collecting device A, the solid A is conveyed into a packaging device A through low-pressure conveying gas A, and it is ensured that the temperature of the solid A at the conveying tail end does not exceed 85 DEG C.

The utility model discloses a continuous cooling crystallization device for recovering and extracting sodium sulfate in waste battery electrolyte. The continuous cooling crystallization device comprises a crystallizer shell and a crystallizer jacket, the crystallizer jacket is fixedly arranged on the outer wall of the crystallizer shell in a sleeving manner; a circulating cooling medium is introduced into the crystallizer jacket, a coaxial sleeve-shaped guide cylinder is arranged in the crystallizer shell, two layers of stirring blades are arranged in the guide cylinder, and the stirring blade at the lower layer is flush with the lower edge of the guide cylinder; one end of a first channel serving as a feeding hole of the crystallizer is positioned on the side wall of the guide cylinder, and extends out of the outer wall of the crystallizer jacket after sequentially passing through a cylinder body of the crystallizer shell and the crystallizer jacket; one end of a second channel serving as a turbidimeter and thermometer port extends into the barrel of the crystallizer shell and extends out of the outer wall of the crystallizer jacket after passing through the crystallizer jacket, and one end of a first channel located on the side wall of the guide cylinder is located between the double-layer stirring blades.

The invention discloses a BOE waste liquid treatment method and device. The method comprises the following steps: replacing hydrogen fluoride in BOE waste liquid with sulfuric acid, evaporating, fractionating and recovering hydrofluoric acid, neutralizing evaporated residual liquid with ammonia to obtain a fluorine-containing ammonium sulfate solution, defluorinating with fluorgypsum slurry to obtain a low-fluorine ammonium sulfate solution, and concentrating and crystallizing to obtain an ammonium sulfate product. The BOE waste liquid is treated by adopting the scheme, the bottleneck of the market capacity of ammonium bifluoride is avoided, the hydrofluoric acid product and the ammonium sulfate product with huge market capacity are produced, the value orientation of turning waste into wealth, circular economy and environmental protection is really realized, and the method is suitable for industrial popularization and application.

The invention belongs to the technical field of reaction crystallization type solid-liquid separation, and particularly relates to filtering equipment with a reaction aging crystallization function. The device comprises a reaction kettle and a centrifugal filter disc which is located in the reaction kettle and can rotate and ascend and descend, and a reserved channel for materials to ascend and filter cakes to descend is formed between the disc edge of the centrifugal filter disc and the inner wall of the reaction kettle; the upper disc surface of the centrifugal filter disc is provided with a filter surface, a kettle cavity of the reaction kettle is communicated with a liquid accumulation cavity positioned in the centrifugal filter disc through the filter surface, the liquid accumulation cavity is communicated with a mother liquor outlet through a transition channel, and a slag outlet for discharging filter cakes is formed in the bottom of the reaction kettle. Through vertical reciprocating motion of the filter disc and multi-dimensional motion of rotation, rapid filtering and centrifugal discharging functions of materials needing reaction, aging and crystallization operation are achieved, smoothness of a filtering medium channel can be effectively guaranteed, and the effects of being simple in structure and compact in structure are achieved.

The utility model discloses a crystallization device which comprises a mother liquor tank, an oscillation temperature crystallization pipe and a crystallization tank, the oscillation temperature crystallization pipe comprises a plurality of low-temperature crystallization pipes and a plurality of high-temperature crystal dissolving pipes, the plurality of low-temperature crystallization pipes and the plurality of high-temperature crystal dissolving pipes are alternately connected, and the low-temperature crystallization pipes are arranged at the heads and the tails of the low-temperature crystallization pipes, and the mother liquor tank is connected with the first low-temperature crystallization pipe in the oscillation temperature crystallization pipe; and the crystallization tank is connected with the last low-temperature crystallization pipe in the oscillation temperature crystallization pipes. According to the crystallization device provided by the embodiment of the utility model, mother liquor to be crystallized is finally converged to the crystallization tank from the mother liquor tank through the oscillation temperature crystallization pipes of the low-temperature crystallization pipes and the high-temperature crystal dissolving pipes which are alternately arranged, and the mother liquor to be crystallized can be continuously and sequentially cooled and heated by utilizing the device, and is crystallized by utilizing the oscillation temperature; and crystalline substances can be rapidly obtained.

The utility model discloses a calcium pantothenate production and processing crystallization kettle with a wall sticking prevention function, which relates to the technical field of crystallization kettles and comprises a kettle body, a feed port is mounted at the upper part of the kettle body, a discharge port is mounted at the bottom of the kettle body, a stirring piece is mounted in the kettle body, and a cleaning piece is mounted on the stirring piece. According to the utility model, airflow is transmitted by starting the control valve and the air pump, and then is transmitted through the transmission pipe, so that the airflow is transmitted into the exhaust pipe and is exhausted through the exhaust hole, and residual materials scraped by the scraper blade can be removed, so that the residual materials on the inner wall of the kettle body can be removed more effectively; the motor is started to drive the rotating shaft to rotate, then the cleaning assembly fixedly connected with the connecting rod is driven to rotate, and then the cleaning assembly is driven to move leftwards through centrifugal force, so that the scraping plate is driven to move leftwards, the scraping plate is attached to the inner wall of the kettle body, and residual materials on the inner wall of the kettle body can be cleaned.

The invention belongs to the technical field of freeze concentration, and relates to a freeze concentration method, which comprises the following steps: freezing a dilute solution to obtain a solid or a solid-liquid mixture, crushing the solid or solid-liquid mixture obtained by freezing, or firstly separating the solid-liquid mixture and then crushing the solid, and adopting dry gas as an energy medium, and penetrating the crushed solid and transferring heat, and staged reserving the solution to realize freezing concentration of the dilute solution. The method improves the efficiency of freeze concentration and separation purification, is simple to operate, and can be conveniently applied to the fields of food, cosmetics, biological medicine, petrochemical industry, environment-friendly treatment and the like.

A method for increasing the yield of an artemisinin crude product belongs to the technical field of artemisinin extraction, and comprises the following steps: an extraction step: adding artemisia apiacea leaves into a petroleum ether solvent, and extracting by combining heating stirring, ultrasonic waves or microwaves; a separation step: carrying out liquid-solid separation by adopting a filtering or centrifuging mode to obtain an artemisinin extracting solution containing artemisinin; a concentration step: evaporating and concentrating the artemisinin extracting solution to obtain an artemisinin concentrated solution; a crystallization step: putting the artemisinin concentrated solution into a crystallization tank for crystallization, and filtering after crystallization to obtain a mother solution and an artemisinin crude product; the crystallizing tank is a cold and hot crystallizing tank provided with a refrigerant ring cavity and a heating medium ring cavity at the same time, the artemisinin extracting solution on the upper portion can be rapidly cooled, meanwhile, the artemisinin extracting solution on the lower portion is kept at the constant temperature, impurities attached to low-temperature crystals can be reduced, the crystallizing speed is increased, and the crystallizing recovery rate of the artemisinin crude product is increased.

The utility model provides a ferrous sulfate monohydrate preparation device which comprises a pulping tank, a crystal transformation tank, a first solid-liquid separator and an evaporator which are sequentially connected, and the pulping tank is provided with a ferrous sulfate heptahydrate solid feeding port, a high-temperature condensate water inlet, a crystal mush filtrate inlet and a ferrous sulfate solution discharging port. The crystal transformation tank comprises a first ferrous sulfate solution feed port and a ferrous sulfate crystal slurry discharge port, the pulping tank and / or the crystal transformation tank are / is provided with a secondary steam inlet, and the first ferrous sulfate solution feed port is connected with the ferrous sulfate solution discharge port; the first solid-liquid separator is used for carrying out solid-liquid separation on the ferrous sulfate crystal mush discharged from the first ferrous sulfate crystal mush outlet to obtain ferrous sulfate monohydrate solid and primary filtrate. According to the utility model, high-temperature condensate water and crystal mush produced in the evaporation process are used for dissolving ferrous sulfate heptahydrate to provide a heat source, so that the resource utilization rate is improved, energy is saved, consumption is reduced, and the sewage treatment cost is reduced.

The invention relates to a method for removing organic oligomers in a saturated ammonium sulfate liquid system discharged by an acrylonitrile ammonium sulfate device crystallizer, belongs to the field of chemical waste liquid resource recycling, and particularly relates to a method for removing organic oligomers in a saturated ammonium sulfate liquid system discharged by an acrylonitrile ammonium sulfate device crystallizer. The invention aims to solve the technical problem that the ammonium sulfate polymer waste liquid discharged by the crystallizer of the existing acrylonitrile ammonium sulfate device affects the stable operation of the incinerator of the environment-friendly device. After being treated by the method, the amount of the recyclable ammonium sulfate liquid is 80-90%, the amount of the separated oligomer liquid is 10-20%, the concentration of the oligomer in the separated oligomer liquid is 70-80%, and the amount of ammonium sulfate in the separated and incinerated oligomer liquid is only 1-4.5% of the amount of ammonium sulfate in the original incineration liquid, so that the influence of ammonium sulfate on an incinerator can be greatly relieved or eliminated; and long-term stable operation of the incinerator device is ensured.

The invention discloses a lithium hexafluorophosphate production control system and a method thereof, and relates to the technical field of lithium hexafluorophosphate production, and the method specifically comprises the following steps: obtaining crystallization dynamic information of each area in a reaction kettle in a lithium hexafluorophosphate crystallization process in real time, and analyzing after obtaining to obtain a crystallization dynamic result; respectively generating a crystal growth driving force coefficient and a particle uniform distribution index of each region; constructing a particle size distribution evaluation model for the generated crystal growth driving force coefficient and particle uniform distribution index of each region, generating a particle size distribution coefficient of each region, and performing comprehensive analysis after generation to generate an evaluation coefficient; and analyzing the generated evaluation coefficient, and evaluating the uniformity degree of particle size distribution in the reaction kettle in the lithium hexafluorophosphate crystallization process. The problem of uneven particle size distribution in the lithium hexafluorophosphate crystallization process is solved, and the effect of improving the particle size uniformity and the product quality stability is achieved.

The utility model relates to the technical field of fatty acid production equipment, and discloses a fatty acid crystallization device which comprises a main body assembly, a crystallization kettle, a stirring shaft, a driving disc and a stirring piece, the stirring shaft is rotatably connected in the crystallization kettle, the driving disc is fixed on the surface of the stirring shaft, and the stirring piece is arranged on the stirring shaft; the adjusting assembly is arranged on the stirring shaft and comprises an adjusting part, a positioning part and a driving part, the adjusting part is arranged in the stirring shaft, the positioning part is located on the surface of the adjusting part, and the driving part is arranged on the surface of the adjusting part; according to the utility model, the plurality of stirring pieces can be quickly and simultaneously disassembled and assembled by arranging the adjusting assembly, and the angles of the plurality of stirring pieces can be simultaneously adjusted, so that the working efficiency is greatly improved, and meanwhile, the angle of each stirring piece can be independently adjusted as required, and the use flexibility of the device is improved.

The invention provides an evaporative crystallization device and process for fluorine-containing high-salinity wastewater, and relates to the technical field of high-salinity wastewater treatment.The evaporative crystallization device for the fluorine-containing high-salinity wastewater comprises a support and an evaporation tank, and a first material opening used for communicating a stacking ring cavity with a material storage cavity is formed in an inner cylinder; a second material opening for communicating the material storage cavity with the material discharge cavity is formed in the first baffle plate; the heating assembly is in contact with and heats the wastewater to evaporate and discharge a wastewater solvent, a wastewater solute is gradually separated out to form crystals and moves towards the material stacking ring cavity, the first material opening is controlled to be opened, the second material opening is controlled to be closed, the crystals in the material stacking ring cavity enter the material storage cavity through the first material opening, and then the first material opening is controlled to be closed and the second material opening is controlled to be opened; the crystals in the material storage cavity enter the material discharging cavity through the second material opening, the crystals in the material discharging cavity are discharged through the first auger, the separated crystals can be continuously discharged without shutdown, meanwhile, the negative pressure environment in the evaporation tank is prevented from being damaged, and the working efficiency is improved.

The invention relates to the technical field of fertilizer processing, and provides a fluidized bed granulation device and a granulation method.The fluidized bed granulation device comprises a fluidized bed granulator, a cooler, a molten liquid conveying pump and a seed crystal making machine, and the molten liquid conveying pump is communicated with the fluidized bed granulator and the cooler through a first flow path; the molten liquid conveying pump is used for pumping molten liquid to the fluidized bed granulator and the cooler through the first flow path; the seed crystal making machine is respectively communicated with the fluidized bed granulator, the cooler and the molten liquid delivery pump through a second flow path, and is used for making the molten liquid pumped by the molten liquid delivery pump through the second flow path into seed crystals; and the seed crystal is conveyed to the fluidized bed granulator and the cooler through the second flow path. According to the invention, large-particle products with good roundness and good hardness can be produced without crushing of a crusher, and the product quality is improved.