51results about "Fusion" patented technology

The invention belongs to the technical field of semiconductor material preparation, and particularly relates to a crucible assembly for synthesizing silicon carbide powder and a synthesis method of the crucible assembly. The crucible assembly comprises an outer crucible, a charging crucible and a supporting ring. The outer crucible is made of isostatic graphite, the side wall of the inner cavity is provided with a gas guide groove, and the bottom and top crucible covers are provided with vent holes; the charging crucible is made of porous graphite and is accommodated in the outer crucible; the support ring is arranged between the two, and the support surface is provided with a groove. Through the synergistic effect of the bottom vent hole, the supporting ring groove, the outer crucible side wall gas guide groove and the top vent hole, a gas channel of bottom gas inlet, side wall flow guide and top gas exhaust is formed. Impurities such as nitrogen adsorbed by the raw materials can be forcibly discharged, and the nitrogen content of the powder is effectively reduced; and meanwhile, excessive heat on the side wall and the bottom of the crucible is taken away through gas flow, the uniformity of a synthetic thermal field is remarkably improved, local excessive carbonization of the powder is avoided, and therefore the purity and consistency of the silicon carbide powder are synchronously improved.

The invention relates to the technical field of manufacturing of fusible polytetrafluoroethylene resin, in particular to a method for treating an unstable terminal group of fusible polytetrafluoroethylene, which is used for solving the problem that the unstable terminal group cannot be thoroughly treated in the prior art. The method comprises the following steps: heating fusible polytetrafluoroethylene resin to a molten state, after self-reaction, introducing high-purity fluorine-nitrogen mixed gas to carry out fluoridation reaction, and extracting impurities generated by the reaction to obtain unstable soluble polytetrafluoroethylene resin with a treated terminal group; according to the method, soluble polytetrafluoroethylene resin is heated to a molten state, and unstable terminal groups are thoroughly treated through self-reaction and fluorination reaction.

The application discloses a high-boiling halogenated hydrocarbon dechlorination device in the technical field of waste lubricating oil treatment, which comprises a reaction tank, an oil inlet pipe and a reaction agent feeding pipe are connected to the reaction tank, a water washing mechanism is connected to the discharge port of the reaction tank, and a flash tower is connected to the water washing mechanism; a heating plate is arranged in the reaction agent feeding pipe; a through hole is formed in the heating plate; a guide rod is slidably arranged on the reaction tank; a blocking plate is arranged on the inner side end of the guide rod; an installation box is arranged on the reaction tank; the outer side end of the guide rod extends into the installation box and is connected with a pressing piece; a touch switch is arranged in the installation box; and the controller is electrically connected with the heating plate. In the application, when the dechlorination agent solidifies, the speed of the dechlorination agent entering the reaction tank is reduced, the blocking plate moves with the pressing piece to press the touch switch, the controller is driven to control the heating plate to work in the power-on mode, the temperature of the dechlorination agent is increased, and the dechlorination agent can fully contact with the distillate oil.

The embodiment of the invention relates to the field of general methods or devices for granulating raw materials, in particular to material pretreatment equipment suitable for being used in a glove box. According to the material pretreatment equipment suitable for the interior of the glove box, provided by the embodiment of the invention, a powdery material is converted into a molten state through the material transfer device, and the material in the molten state is transferred to the granulation device, so that the material in the molten state is converted into a solid flaky material by the granulation device; the materials are converted from powder to a sheet shape, and transportation and follow-up treatment are facilitated; the powdery materials are exposed in the air in the feeding device, the stirring device and the material transferring device, and the granulating device and the transferring device are arranged in the glove box, so that the finally produced flaky materials can be prevented from being directly exposed in the air, and the materials can be conveniently isolated from operators; and the transfer device is arranged to communicate with the material outlet, so that an operator can conveniently collect and transfer the flaky materials.

The invention relates to a method for adding oil-free zinc stearate in polystyrene, which is applied to the field of polystyrene production, the oil-free zinc stearate is melted in a closed and oxygen-free state, so that the zinc stearate can be effectively prevented from being oxidized and decomposed by heating, and the chemical property stability of the zinc stearate can be ensured, thereby being beneficial to maintaining the consistency of the performance of a terminal product. The oil-free zinc stearate is added in a liquid form after being heated and melted, so that the zinc stearate can be better dispersed in the polystyrene, the polystyrene and the oil-free zinc stearate are more uniformly mixed, and the utilization efficiency of the oil-free zinc stearate is improved; according to the oil-free zinc stearate adding device, quantitative, controllable and continuous feeding of oil-free zinc stearate adding can be achieved, automatic control and process accuracy are facilitated, compared with adding of powdery oil-free zinc stearate, the oil-free zinc stearate can be prevented from being attached to equipment or a container wall, and the oil-free zinc stearate adding accuracy is further improved.

The application discloses a kind of high uniformity medical grade absorbable polyester, preparation method and production system, production system includes kettle type closed stirrer, auxiliary tank, three-way valve and closed kettle type reactor;Three-way valve is communicated with kettle type closed stirrer by melt metering pump;It is communicated with auxiliary tank by micro-injection pump;It is communicated with closed kettle type reactor by static mixer;The side inside of three-way valve and micro-injection pump communication side is designed funnel shape, including funnel neck and funnel mouth, the side surface and bottom surface of funnel neck are equipped with uniform small hole.The application discloses a kind of system specially used for preparing high uniformity medical grade absorbable polyester and the preparation method matched therewith, by using special production system again cooperation specific process parameter can successfully prepare with medical grade absorbable polyester, especially suitable for the preparation of poly-l-lactide and polyglycolide with higher viscosity, more difficult to produce, the product obtained has high uniformity, high molecular weight and low monomer residue.

The tailing pond system in the cold region comprises a tailing dam, a dry beach area, a clarification area, a first ore drawing pipeline and a heat dissipation pipeline, and valves are arranged at the inlet ends of the first ore drawing pipeline and the heat dissipation pipeline; the heat dissipation pipeline comprises a second ore drawing pipeline, a connecting pipeline, a pre-buried pipeline, a first anti-blocking pipeline and a second anti-blocking pipeline which are communicated in sequence; a first ore drawing pipeline and a second ore drawing pipeline are alternately arranged on the tailing dam, and a pre-buried pipeline is laid in the dry beach area; and an outlet of the second anti-blocking pipeline is higher than the level of tailing slurry discharged in the dry beach area. The invention further discloses an ore drawing method of the tailing pond system. The heat generated when the tailing slurry is discharged is used for eliminating a tailing pond freezing layer lenticular body in a cold region, it is guaranteed that the dam body infiltration line is not lifted, and the dam body safety is guaranteed.

The embodiment of the invention relates to the field of general methods or devices for granulating raw materials, in particular to a material treatment method. The method is carried out through preset equipment, the preset equipment comprises a material transfer device, a granulation device, a stirring device, a feeding device and a transfer device, and the method comprises the following steps that S10, different kinds of powdery materials are mixed through the stirring device to obtain a mixed material; s20, the mixed material is transferred to a feeding device; s30, the mixed materials are conveyed to a material transferring device through a feeding device; s40, converting the mixed material into a material in a molten state by utilizing a material transfer device; s50, after the mixed material is converted into a material in a molten state, a granulation device is started; s60, the materials in the molten state are conveyed to a granulation device through a material transfer device; s70, the materials in the molten state are converted into flaky materials through a granulation device; and S80, the flaky materials are transferred through a transfer device. According to the method, material components can be fused, and subsequent transportation and utilization are facilitated.

The phase change heat storage particle preparation device comprises a coating tower, a heating furnace, a liquid heat exchange assembly and a gas heat exchange assembly, wherein the liquid heat exchange assembly and the gas heat exchange assembly are connected with the coating tower and the heating furnace. The coating tower is used for coating an organic material on the surface of the phase change core to form an organic coating layer; the interior of the heating furnace is divided into a preheating area and a melting area in the particle conveying direction, and the heating furnace is used for heating particle green bodies coated with ceramic shell layers in a partitioned mode. The liquid heat exchange assembly conveys the molten organic material in the heating furnace to the coating tower for cyclic utilization; and the gas heat exchange assembly feeds low-temperature gas discharged by the heating furnace into the bottom of the coating tower for cooling a coating layer, and introduces high-temperature gas discharged by the coating tower into the top of the heating furnace for supplementary heating. The method solves the problem of ceramic shell cracking caused by thermal stress concentration in the traditional process, obviously improves the product yield, realizes cyclic utilization of organic materials and heat energy, reduces energy consumption and production cost, and is suitable for industrial continuous production.

The invention relates to the related technical field of glycoside-containing compound fertilizer production, and discloses an energy-saving multi-stage melting device for glycoside-containing compound fertilizer production, which is characterized in that a gas collecting device and a stirring device are arranged in a stirring tank device, and the gas collecting device is arranged above the stirring device; a mixing and stirring device is fixedly connected to the lower part of the stirring device, and the stirring device and the mixing and stirring device are used for stirring chemical fertilizer particles; through the collaborative linkage design of the stirring device and the mixing and stirring device, the multi-layer stirring structure of the middle stirring blade, the bottom scraping plate and the two-layer scraping plate is combined, the convective circulation layout of the side feeding opening and the upper discharging opening in the upper end of the stirring box is matched, and meanwhile the wall hanging prevention combination of sawteeth on the side wall of the stirring box and the vertical scraping plate is utilized; therefore, all-directional and dead-corner-free multi-stage stirring of the fertilizer particles is realized. In the stirring process, the vertical scraping plate is tightly attached to the inner wall of the inner cylinder for continuous scraping, and the sawteeth crush potential caking materials.

The invention relates to a rain drip-proof device in a pot of an explosive melting and mixing system, which comprises a pneumatic ball valve and a transparent water storage pipeline, the upper end of the water storage pipeline is open, and the lower end of the water storage pipeline is closed; a water outlet of the pneumatic ball valve is communicated with a flow guide pipe section extending downwards, the lower end of the flow guide pipe section is communicated with the upper end of the water storage pipeline, and the side portion of the flow guide pipe section is communicated with the interior of the pot through a first flow guide pipeline. If the pneumatic ball valve of the fire-fighting deluge switch has abnormal leakage, a small amount of leaked fire-fighting deluge water does not leak into the pot but enters the water storage pipeline, so that workers can conveniently inspect, find and process the fire-fighting deluge water, and the production quality and safety problems are avoided.

This invention discloses an automated control device and method for a sulfur melting kettle, comprising a sulfur melting kettle, a sulfur foam control system, a clear liquid control system, a steam control system, a liquid sulfur control system, and a condensate control system, all connected to the kettle. A slag discharge mechanism is installed inside the kettle. The sulfur foam control system, clear liquid control system, steam control system, liquid sulfur control system, condensate control system, and slag discharge mechanism are all connected to a DCS / PLC. The slag discharge mechanism includes a shell rotatably connected to the kettle body at one end, a covering assembly rotatably connected to the other end of the shell, and a balancing assembly disposed within the shell. A slag discharge channel is provided inside the shell. The automated control device and method for a sulfur melting kettle provided by this invention features automated and remote production operation, automatic slag discharge, ensuring continuous production, improving production efficiency, and protecting the safety and health of operators.

This invention provides a heating melting tank for producing mupirocin ointment, relating to the field of mupirocin ointment production technology. The heating melting tank for producing mupirocin ointment includes a tank body, a stirring shaft, stirring blades, a scraper, and a limiting assembly. The scraper is parallel to the stirring shaft and movably disposed on one side of the stirring shaft. The scraper has a first position and a second position. In the first position, the scraper abuts against the inner wall of the tank; in the second position, the scraper has a gap with the inner wall of the tank. The limiting assembly is disposed on the stirring shaft and connected to the scraper, used to limit and fix the scraper in the first and second positions. This invention has the effect of scraping off the mupirocin ointment adhering to the inner wall of the tank after discharge, thereby reducing waste.

The invention relates to the technical field of waste PET recovery, and discloses a trapping method and system for recovering DMT in waste PET through a chemical method, and the method comprises the following steps: (1) carrying out rectification and tower top condensation on crude DMT obtained by recovering waste PET through the chemical method to obtain uncondensed gas-phase DMT; (2) the gas-phase DMT is introduced into a cold trap trap for trapping, a plurality of layers of coil pipes which are spirally and upwards arranged are arranged in the cold trap trap, and the coil pipes are finned pipes; and in the cold trap, cooling circulating water is firstly introduced to desublimate the gas-phase DMT to obtain solid-phase DMT, and then circulating steam is introduced to melt the solid-phase DMT and recover the solid-phase DMT to obtain liquid-phase DMT. By optimizing relevant parameters of cold trap trapping, DMT can be more efficiently trapped and recovered, the loss rate of DMT is reduced, and meanwhile, the situation that excessive DMT gas phase enters a vacuum system, a vacuum pipeline is blocked, and consequently the vacuum degree of DMT vacuum distillation is affected is avoided.

The invention relates to the technical field of waste rubber recovery, in particular to automatic refining equipment for vulcanized rubber forming blanks. The cracking furnace is arranged in a rack and is used for heating rubber powder into a molten state, a hopper is arranged at the top of the cracking furnace, a shell is arranged below the cracking furnace, and a feeding hole for communicating the cracking furnace with the shell is formed between the cracking furnace and the shell; and when the paving seat reciprocating along with the paving seat is blocked by the metal wires clamped into the filter holes, the paving seat passes through the metal wires through the lower press filter plate. And the distance between the short support arms of the limiting L-shaped plate and the sealing L-shaped plate is enlarged. And after the paving seat crosses the clamped metal wire, the filter plate loses the downward pressure and resets under the action of the restoring force of the spring. In the process that the suction block reciprocates along with the paving seat, when the collecting tank moves to the position above the metal wires, suction force generated by the suction block enables the metal wires to leave the surface of the filter plate, and the metal wires are adsorbed and collected in the collecting tank.

The application discloses an automatic temperature control grease preparation and conveying circulating equipment, wherein the grease sequentially passes through an oil tank, an emulsifying tank, an oil storage tank and a grease conveying pipeline, and is returned to the oil tank or the oil storage tank through a grease return pipeline; the oil tank, the emulsifying tank and the oil storage tank are all provided with a sandwich structure; the grease conveying pipeline passes through a plate heat exchanger and is provided with an oil outlet branch pipe; the grease conveying pipeline and the grease return pipeline are both provided with a temperature control pipeline on the circumferential surface; a hot water tank is connected to the sandwich of the emulsifying tank and the oil storage tank, the output end of the plate heat exchanger and the temperature control pipeline; a steam pipeline is connected to the oil tank and the hot water tank; a cold water pipeline is connected to the sandwich of the emulsifying tank and the oil storage tank and the input end of the plate heat exchanger; temperature sensor probes are arranged at positions corresponding to the pipelines, temperature display tables are arranged on the tank bodies, the temperature sensor probes are connected to the corresponding temperature display tables and are connected to a PLC temperature control system. The application guarantees the grease circulating flow efficiency and avoids the blockage of the pipeline caused by the grease solidification.

The invention discloses a novel sulfur melting kettle and a control method thereof, and relates to the technical field of sulfur melting kettles.The novel sulfur melting kettle comprises a skirt and a kettle body, the kettle body is arranged on the upper portion of the skirt, a feeding port is formed in the upper portion of the kettle body, the feeding port is connected with a feeding pump, the feeding pump is connected with a hopper, a sulfur discharging port is formed in the lower portion of the kettle body, and the sulfur discharging port is connected with the kettle body. A steam inlet and a slag tap are formed in the side end of the kettle body. According to the novel sulfur melting kettle and the control method thereof, by adjusting relevant parameters, it is guaranteed that equipment is controlled to operate in the optimal state, discharged separation liquid is clearer, more converted crystal sulfur is obtained, energy consumption is lower, and efficiency is higher. And sulfur and slag can be automatically discharged, so that the labor intensity is reduced, and the contact between people and a severe environment is reduced.

The invention discloses a liquid drop generator. The liquid drop generator comprises a liquid storage barrel used for storing a working substance; the heating device is connected to the outer surface of the liquid storage barrel in a sleeving mode and used for heating the working substance in the liquid storage barrel so that the working substance can be molten into liquid; the needle connector is connected with the bottom of the liquid storage barrel and used for enabling liquid in the liquid storage barrel to flow out; the ultrasonic vibration device is used for applying disturbance to the liquid in the liquid storage barrel, so that the liquid in the liquid storage barrel forms a liquid drop sequence at the needle connector; the first end of the cooling cylinder is connected with the ultrasonic vibration device through a flange structure, the second end of the cooling cylinder is connected with the liquid storage barrel through a flange structure, and the cooling cylinder is used for reducing the temperature of the ultrasonic vibration device. Performance degradation and depolarization failure of the ultrasonic vibration device caused by high temperature are avoided, the reliability of the liquid drop generator is improved, and the service life of the liquid drop generator is prolonged. Meanwhile, independent disassembly and replacement of all the modules are achieved, and maintenance can be completed under the condition that other modules are not affected.

This invention discloses a material preparation system for preventing hot gas backflow, comprising a first material preparation tank with an internal stirring device, a feeding mechanism connected to the first material preparation tank, and a first heating mechanism. A heat-insulating connection mechanism is provided between the feeding mechanism and the first material preparation tank. The heat-insulating connection mechanism includes a feed valve, a heat insulation pipe, and an air blowing device that prevents hot gas from entering the feeding mechanism, connected in sequence. The feed valve is located at the feed inlet of the first material preparation tank, and the feeding mechanism is connected to the air blowing device. This material preparation system has advantages such as the ability to feed materials while operating, improved production efficiency, and reduced production costs.

The present invention relates to an apparatus (8) for melting a gas (2) in a solid state, the apparatus comprising a closed loop (12) in which the same gas as the gas in the solid state (2) circulates in a liquid state (6) in the closed loop, the closed loop (12) comprising at least one inlet (14) for introducing the gas in the solid state (2) and an outlet (16) through which the gas in the liquid state (6) leaves the closed loop (12), the melting apparatus (8) comprising at least one heat exchanger (18) for exchanging heat between the gas in the liquid state (6) circulating in the closed loop (12) and another fluid.

The invention discloses a sulfur melting kettle, a sulfur foam thickening sulfur melting device and a thickening sulfur melting method, and belongs to the technical field of coal gas purification in the coking industry. The thickening and sulfur melting method comprises the following steps: 1) filtering low-concentration sulfur foam with the sulfur content of 15-25% by mass, and separating to obtain sulfur paste and desulfurization clear liquid; (2) blending the obtained sulfur paste into high-concentration sulfur foam with the sulfur content of 75-85% by mass, and uniformly stirring to a thick emulsified state; 3) conveying the high-concentration sulfur foams in the thick emulsified state into the sulfur melting kettle for melting. Through filtering and blending, the concentration of the sulfur foams is improved, steam for producing unit sulfur is reduced, the energy-saving effect is improved, the total amount of materials entering the sulfur melting kettle is reduced, the time required for melting is greatly shortened, and the production efficiency is improved.

The invention discloses an automatic powder production line and relates to the technical field of automatic production lines. A weighing sensor is fixedly connected to the surface of the bottom end of a feeding hopper, a display panel is fixedly connected to the front surface of the weighing sensor, and a small vibrating feeder is fixedly connected between the bottom face of the feeding hopper and a heating smelting furnace; a discharging port of the flow guide plate is located at the feeding end of the extrusion roller, the spiral blade is fixedly connected with the fixing rod, and the fixing rod is located in the extrusion roller and fixedly connected with the extrusion roller. The device has the advantages that data in the feeding process are displayed and recorded in real time, the temperature in the heating and melting stage is accurately controlled, the heat transfer efficiency of the extrusion roller is effectively improved, the temperature control stability of the roller is ensured, the pollution of an overflowing solution to the environment is remarkably reduced, meanwhile, a high-pressure spray gun is used for cooling the crushing roller and blowing off particles, and the production efficiency is improved. And accumulated materials and abrasion are reduced, and the process stability, cleanliness and production efficiency are improved.

The invention discloses high-purity silicon powder production equipment and a using method thereof.The high-purity silicon powder production equipment comprises a vacuum furnace chamber, a transmission system, a material loading system, a laser heating system, a cooling system and a powder collecting system.The right upper portion of the vacuum furnace chamber is provided with a laser connecting port, and the laser connecting port is fixedly connected with the laser heating system; a transmission system is fixedly installed on the lower end face of the vacuum furnace chamber, the output end of the transmission system extends into the vacuum furnace chamber, the transmission system is fixedly connected with a material loading system, a discharging port is fixedly formed in the side wall of the vacuum furnace chamber and fixedly connected with a cooling system, and the other end of the cooling system is fixedly connected with a powder collecting system. Silicon liquid evaporation is carried out in a direct laser heating mode, the positions of laser and the liquid level are maintained through the transmission system, meanwhile, the transmission system drives the silicon liquid to rotate so that the temperature in the silicon liquid can be uniform, gaseous silicon is condensed through the cooling system, follow-up recovery is facilitated, and the preparation efficiency of high-purity silicon powder is improved.

The invention relates to the technical field of metal ingot production, in particular to a suspension lifting type stirring device and method for metal ingot production, and the suspension lifting type stirring device comprises a melting barrel, feeding equipment and a discharging mechanism, and further comprises a stirring assembly; the stirring assembly comprises a shielding sealing cover, a stirring rotating cover, a rotating cover driving mechanism, two mounting pieces, an overturning receiving table, a reciprocating steering component and a stirring component, the shielding sealing cover is arranged at the top of the melting barrel, the stirring rotating cover is rotatably mounted on the shielding sealing cover, the rotating cover driving mechanism is mounted on the shielding sealing cover, and the two mounting pieces are fixedly mounted on the two sides of the stirring rotating cover correspondingly; the bottom of each mounting part is rotationally provided with an overturning receiving table, the reciprocating steering component is connected with the mounting parts, each overturning receiving table is provided with a stirring component, and the contact time of the corresponding stirring main body and a metal melt can be greatly shortened through the arranged mechanical stirring mechanism under the condition that the normal stirring effect is not affected; therefore, the service life of the corresponding stirring main body is prolonged.

The application discloses a device for preparing coated asphalt from oil sand asphalt and a process thereof, and belongs to the field of asphalt processing. The device comprises a processing box, four grounding feet are arranged at the bottom end of the processing box, an arch bridge is arranged at the top end of the processing box, a counter stirring mechanism is arranged below the arch bridge, a detachable plugging disc is arranged at the bottom end of the processing box, a heating mechanism is arranged on the plugging disc, and a discharge pump is arranged on the side wall of the processing box. First, the oil sand material is sent into the processing box, then hot vegetable oil is connected to the butt joint pipe, the heat of the vegetable oil is transferred to the heating column, the heat of the heating column is transferred to the oil sand material, and then the temperature of the oil sand approaches 200 DEG C, the asphalt material in the oil sand is liquefied, at the same time, the sand particles and the soil are not melted, the sand particles and the soil are larger in density than the asphalt and are deposited at the bottom end of the processing box, and the heating mode is relatively high in safety.

The present application relates to oxygen production technical field, disclose a kind of liquid silver oxygen production device, including double chamber furnace, heating assembly, vacuum suction mechanism, water cooling mechanism and stirring mechanism;The double chamber furnace is set as runway shape cylinder structure, including furnace shell and the double chamber crucible being set in furnace shell, the double chamber crucible is divided into oxygen production cavity and oxygen dissolving cavity, hole is opened between oxygen production cavity and oxygen dissolving cavity, so that two chambers are communicated, the top of the furnace shell is provided with furnace cover.The present application utilizes the physical properties of liquid silver from air selective oxygen dissolving and pressure release to produce high-purity oxygen, oxygen production cavity and oxygen dissolving cavity are separated, are communicated by liquid silver, adopt vacuum mechanism, and oxygen dissolved in liquid silver is released by pressure reduction;Adopt stirring mechanism, guide liquid silver directional circulation flow between oxygen dissolving cavity and oxygen production cavity, form the working condition of oxygen dissolving on one side and oxygen production on the other side, accelerate the collection of oxygen in oxygen production cavity.

The invention relates to the technical field of powder production, and discloses a powder coating continuous production device based on twin-screw extrusion, the powder coating continuous production device comprises an extrusion box, a pair of extrusion screws are rotatably connected in the extrusion box, output gears are fixedly connected to the outer walls of shaft rods of the extrusion screws, and teeth of the two output gears are engaged with each other; a servo motor is fixedly installed on one side of the extrusion box, an output shaft of the servo motor is fixedly connected with a shaft rod of one extrusion screw, the upper portion of the extrusion box fixedly communicates with a feeding bin, the lower portion of the extrusion box fixedly communicates with a discharging port, and an impurity discharging assembly is arranged above the feeding bin. When particle impurities intercepted on the upper surface of the first filter screen are accumulated to a certain degree, the impurity discharging assembly drives the first filter screen to rotate, the intercepted particle impurities are discharged out, collection treatment of the particle impurities is completed, the particle impurities with high hardness are effectively prevented from entering the extrusion box, and the extrusion efficiency is improved. The particles are prevented from colliding with the surface of the screw in the material conveying process of the screw, and the surface of the screw is protected.

The invention discloses a urea low-temperature melting method, and relates to the field of urea processing, the urea low-temperature melting method comprises the following steps: S1, raw material pretreatment: crushing solid urea until the particle size is 20-80 meshes to obtain urea fine powder for later use; s2, low-temperature dispersion: obtaining a urea suspension; s3, gradient temperature control hydrotropy is conducted, and a urea initial solution is obtained; and S4, constant-temperature stabilization: adjusting the temperature in the melting kettle to 35-40 DEG C, and stirring for 10-15 minutes at a constant temperature to obtain a uniform and stable urea melting solution. According to the urea low-temperature melting method, the melting temperature does not exceed 60 DEG C in the whole process, compared with a traditional high-temperature melting process, heat energy consumption is greatly reduced, the production cost is reduced, meanwhile, urea high-temperature decomposition is fundamentally avoided in the low-temperature environment, generation of by-products such as biuret and triuret is eradicated, and the production cost is reduced. The purity and the effective content of the urea melt are ensured, the urea product is improved, and a better use prospect is brought.

The invention discloses a high-purity gallium oxide synthesis device, and belongs to the technical field of gallium oxide synthesis. Pure water and gallium raw materials in a raw material tank I or a raw material tank II are stirred by arranging a connecting rod, a glass gas-guide tube, a rotating motor, a transmission belt, a wind wheel and a wind guide motor, so that the pure water and the gallium raw materials are uniformly heated; starting a wind guide motor to control a wind wheel to rotate until pure water in the raw material tank I is evaporated to form water vapor and the gallium raw material in the raw material tank II is gradually heated and melted into a liquid state, guiding the water vapor in the raw material tank I to a glass gas-guide tube, and introducing the water vapor into the liquid gallium raw material in the raw material tank II from the glass gas-guide tube; meanwhile, the stirring rod stirs in the raw material tank I and the raw material tank II, so that the water vapor and the liquid gallium fully react to generate gallium oxide and hydrogen, the gallium oxide synthesis efficiency is improved, and uniform heating during gallium oxide synthesis is ensured.

The invention relates to a molten salt system safety evaluation method based on HAZOP-grey clustering analysis. The method comprises the following steps: collecting real-time operation data of each component of a molten salt system; the real-time operation data are input into a back-propagation neural network BP, the security level of each component of the molten salt system is output, the back-propagation neural network BP is optimized through a GA genetic algorithm and is obtained through training based on a training set, and the training set comprises historical operation data and the corresponding historical security level; and performing grey clustering analysis on the safety level of each component of the molten salt system to obtain the comprehensive safety level of the molten salt system. The method can effectively identify the potential risk, improves the safety of the molten salt system, and has an important practical value.