163results about How to "Raise the grade" patented technology

The utility model discloses a high-precision airflow classifier, and relates to the technical field of sorting. The high-precision airflow classifier comprises an airflow classifier shell and a classification device, the classification device comprises a feeding port, the feeding port is fixedly connected to the upper end of the airflow classifier shell and extends into the airflow classifier shell, the upper end of the feeding port is fixedly connected with a driving motor, and the output end of the driving motor is fixedly connected with a rotating shaft; the lower end of the rotating shaft is fixedly connected with a dispersing disc, the surface of the dispersing disc is fixedly connected with baffles, the surface of the dispersing disc is rotationally connected with blades, and resin raw material particles collide with the baffles and the blades through the centrifugal effect of rotation of the dispersing disc, so that the resin raw materials are scattered, and the resin raw materials are evenly distributed in the airflow classifier shell; the uniform distribution ensures that the resin raw materials can be subjected to uniform airflow and centrifugal force, so that the stability and precision of the grading process are improved, and the grading efficiency of the device is improved.

The invention discloses a beneficiation method for efficiently recovering barite from heat treatment drilling waste. The beneficiation method comprises the following steps that (1) the drilling waste containing the barite is subjected to wet screening classification; (2) performing magnetic separation on the undersize product to obtain a magnetic product and a non-magnetic product; (3) carrying out primary roughing and primary concentration on the non-magnetic product to obtain a barite powder product 1; and (4) the roughing tailings are subjected to scavenging for three times, scavenged concentrates are combined and then subjected to fine selection for two times, and a barite powder product 2 is obtained. According to the method, barite in the heat treatment drilling waste is efficiently recycled by adopting a beneficiation method, two different grades of barite powder products are obtained and can serve as drilling fluid raw materials to be recycled, resource utilization of the waste is achieved, and meanwhile environmental hazards are reduced.

The invention provides a beneficiation and enrichment method for high-molybdenum oxide ore, which comprises the following steps of: performing fraction magnetic separation on a product after ore grinding, regrinding magnetic separation coarse particle tailings, mixing the reground product with magnetic separation fine fraction tailings to perform low-potential sulphide ore flotation, performing oxidized ore flotation on sulphide ore flotation tailings, and the like. And finally, the molybdenum concentrate with the high recovery rate and grade is obtained, the molybdenum ore separation and enrichment effect is achieved, and the fine disseminated-particle-size refractory molybdenum oxide ore resources in the high-oxidation-type molybdenum ore are effectively and comprehensively recycled. In order to quickly optimize and obtain the optimal condition of oxidized ore flotation, the flotation inhibitor with the good inhibition effect is determined through the pure ore flotation test, the flotation collecting agent with the high selectivity is selected through the molecular simulation calculation method, and the flotation efficiency and selectivity are improved. The method provided by the invention can be widely applied to the fields of development of high-oxidation molybdenum ore mines and recycling of fine-fraction refractory molybdenum oxide ore resources in tailings after sulfuration flotation.

The invention discloses a knowledge graph ontology constrained vegetation remote sensing classification method. The method comprises the steps of data acquisition and data preprocessing, deep learning model selection and fusion of a knowledge graph ontology and a deep learning model. According to the method, the knowledge graph ontology and the FCN8s-ResNet 50 model are fused in the two stages of model training and classification post-processing. The result shows that 1) the classification accuracy of the deep learning model can be remarkably improved by fusing the mountain vegetation knowledge graph ontology in the two stages of deep learning model training and classification post-processing: the accuracy of the deep learning model constrained by the knowledge graph ontology is improved by 10%, and the overall classification accuracy of vegetation types reaches 89.2%; and 2) the deep learning model constrained by the mountain vegetation mapping knowledge domain ontology not only obtains excellent results in fine classification of vegetation types, but also improves the universality and interpretability of the model, so that powerful support is provided for wide-range remote sensing vegetation classification and application of the deep learning model.

The invention provides a copper slag magnetic separation iron extraction method and application thereof.The copper slag magnetic separation iron extraction method comprises the steps that copper slag and a calcium oxide-based additive are mixed to obtain mixed copper slag, the calcium oxide-based additive comprises calcium oxide and / or a calcium oxide raw material, the calcium oxide raw material can generate calcium oxide through heating, and the calcium oxide raw material can generate calcium oxide through heating; the adding amount of the calcium oxide-based additive meets the condition that the total mass of the primary calcium oxide and / or the generated calcium oxide is 29%-47% of the mass of fayalite in the copper slag; the calcium oxide raw material comprises calcium carbonate and / or calcium sulfate; after the mixed copper slag is heated to 1250-1800 DEG C, heat preservation is conducted for 30-120 min, and modified copper slag is obtained; and the modified copper slag is sequentially subjected to slow cooling, crushing and magnetic separation, and iron is obtained. According to the method, the iron element is enriched in a liquid phase, and the recovery rate of iron resources in the copper slag is substantially increased from the source.

The invention discloses a beneficiation method of refractory iron ore with symbiotic hematite, limonite and siderite, which comprises the following steps of: crushing weakly magnetic refractory iron ore to below 100mm in a closed circuit, then sequentially carrying out three times of dry screening to obtain four particle fractions of 0-6mm, 6-15mm, 15-40mm and 40-100mm, pre-selecting the particle fractions of 6-15mm by adopting a dry high-intensity magnetic separator, pre-selecting the particle fractions of 15-40mm by adopting a chunk jigger, pre-selecting the particle fractions of 40-100mm by adopting a photoelectric intelligent separator, and pre-selecting the particle fractions of 40-100mm by adopting a high-intensity magnetic separator; photoelectric intelligent pre-selected concentrate is crushed to 0-40 mm through a fine crushing closed circuit, then jigging pre-selected concentrate is combined, then the photoelectric intelligent pre-selected concentrate is crushed to 0-6 mm through an ultra-fine crushing closed circuit, an ultra-fine crushing product is combined with the 0-6 mm fraction, then wet type strong magnetic pre-selection is conducted through a coarse grain wet type strong magnetic separator, the pre-selected concentrate is subjected to ore grinding-fine grain wet type strong magnetic one-coarse one-scavenging one-coarse one-scavenging one-fine one-scavenging reverse flotation, and the final concentrate is obtained. And final concentrate is obtained. The invention has the advantages of large raw ore selection granularity, large tailing discarding amount, low energy consumption, good separation effect and the like.

The invention discloses a concrete member crack measurement method based on a convolutional neural network, and relates to the field of concrete crack detection, and the method comprises the steps: carrying out the marking, size clustering, image enhancement, coordinate transformation and other preprocessing operations of a concrete member image, and constructing a detection model architecture; wherein the backbone network adopts a pre-trained ResNet-50 network to extract multi-scale features of the image; the box neck and the box head are used for generating local crack box output; the grid neck and the grid head are used to generate a global fracture grid output. In a model training process, local box output and global grid output are optimized by adopting a joint loss function, and prior category information of crack size clustering is introduced to guide learning of a detection model. In the reasoning stage, an image to be detected is input into the trained detection model, box output and grid output are obtained, and a final crack detection result is obtained through post-processing such as non-maximum suppression. And aiming at low crack detection precision under a complex background, the detection precision is improved.

The invention discloses a flotation method, particularly discloses a flotation method for vanadium titano-magnetite ilmenite, and belongs to the technical field of mineral separation processes in metallurgical production. The flotation method for the vanadium titano-magnetite ilmenite can effectively improve the titanium concentrate recovery rate and the titanium concentrate grade and reduce the reagent use cost. The flotation method comprises ilmenite direct flotation, and according to the flotation method, titanium concentrate obtained through ilmenite direct flotation serves as a working object to be sequentially subjected to at least one time of rotational flow classification desliming and at least one time of rotational flow concentration desliming. And finally, ilmenite direct flotation is conducted on the coarse grain part in the fine-grain low-grade titanium concentrate obtained through rotational flow concentration and desliming, fine-grain high-grade titanium concentrate is obtained, and beneficiation work of flotation of the titanium concentrate is completed, the working object of the rotational flow concentration desliming is the fine-fraction gangue-containing mineral overproof low-grade titanium concentrate discharged by the rotational flow classification equipment in an overflowing manner during each rotational flow classification desliming.

This invention discloses a method for enhancing the recovery of fine-grained titanium ore, belonging to the field of fine-grained titanium ore beneficiation technology. The steps include: (1) pre-enrichment; (2) preparation of modified collectors; (3) desulfurization; (4) multi-dimensional interface-controlled flotation; and (5) deep quality improvement. This invention, by adding a highly efficient activator, interacts with the surface of ilmenite to oxidize more ferrous ions to ferric ions, thereby increasing the number of active adsorption sites of the collector. Simultaneously, it modifies existing unsaturated fatty acid collectors, thereby increasing their dispersion, dissolution, and adsorption capabilities. Under the combined effect of these two factors, the flotation grade and recovery rate of fine-grained ilmenite are significantly improved, achieving the goal of enhancing the recovery of fine-grained titanium ore. The fine-grained titanium ore recovery method provided by this invention not only obtains qualified titanium concentrate, but also features flexible process implementation, low cost, small wastewater treatment volume, and no secondary pollution.

The invention relates to the technical field of ore separation, and provides a split type dry magnetic separator based on a CTX magnetic roller, which comprises a magnetic separation mechanism which is fixed at a first ore outlet of an ore separation mechanism and comprises an electric roller, the CTX magnetic roller and a first conveying rubber belt, and the first conveying rubber belt is wound outside the electric roller and the CTX magnetic roller; the first conveying rubber belt is used for conveying fine-crushed ore flowing out of the first ore outlet to the CTX magnetic roller, the CTX magnetic roller is used for treating the fine-crushed ore to obtain magnetic concentrate and magnetic tailings, the structure of an original ore dressing mechanism does not need to be adjusted, and the situation that the original ore dressing mechanism cannot adapt to installation of the CTX magnetic roller is avoided; the transformation cost of the mineral separation mechanism is effectively reduced; a large amount of tailings are discarded in advance through the CTX magnetic roller, the amount of ore entering a mill is reduced, and energy conservation and consumption reduction are achieved; the grade of the ground iron ore is greatly improved, the ore grading process is optimized, and the grading cost is reduced.

The present invention discloses a method for extracting titanium and removing impurities from low-quality titanium-containing waste, and belongs to the technical field of solid waste resource treatment. The method is to sequentially subject low-quality titanium-containing waste to magnetic separation for iron removal, grinding I, and cascade electrostatic enrichment to obtain a pre-enriched material; the pre-enriched material is placed at a temperature of 800-1000°C for oxidative roasting to obtain a roasted slag containing rutile titanium dioxide; the roasted slag is subjected to grinding II and pickling for impurity removal to obtain a high-grade titanium-rich material product. The method directly obtains a high-grade titanium-rich material product by upgrading and removing impurities from low-quality titanium-containing waste, thereby realizing the high-value utilization of low-quality titanium-containing waste, and the technical route is simple to operate, low in cost, and has high economic value.

The utility model discloses an atmosphere lamp control system in an automobile, an atmosphere lamp and an atmosphere lamp controller are arranged in the automobile, the atmosphere lamp controller is connected with the atmosphere lamp and outputs a control signal to the atmosphere lamp, the atmosphere lamp controller comprises an MCU and a vehicle network transceiver connected with a communication port of the MCU, and the vehicle network transceiver is connected with a communication port of the MCU. And the MCU accesses an automobile communication network through the automobile network transceiver to obtain automobile working condition information. According to the atmosphere lamp controller, different effects of the atmosphere lamp can be achieved in different working scenes, the grade of interior trim is improved, and especially at night, the space in a vehicle can be more visually attractive.

This invention discloses a high-temperature molten slag granulation system coupled with cyclone heat exchange and water mist, including a granulation chamber, a high-temperature molten slag transition device disposed at the top of the granulation chamber, a granulation disc disposed inside the granulation chamber and below the high-temperature molten slag transition device, and a transmission shaft and motor for driving the rotation of the granulation disc. A slag outlet is provided at the bottom of the granulation chamber, and multiple spray nozzles are evenly arranged circumferentially on the upper part of the inner side wall of the granulation chamber. At least four tangential high-pressure air inlets are provided circumferentially below the spray nozzles on the side wall of the granulation chamber, each high-pressure air inlet being connected to a high-pressure blower. An arc-shaped guide baffle is provided on the inner side of each high-pressure air inlet. The system of this invention has a compact structure and no additional moving parts. It can adapt to different working conditions such as blast furnace slag and steel slag by only adjusting the air pressure and water volume, and has broad industrial application value.

The utility model provides an efficient energy-saving system for outputting green steam through coupling of shallow geothermal energy and a high-temperature heat pump, and belongs to the technical field of energy systems. The problem that an existing steam supply system cannot generate green steam energy is solved. Comprising a shallow ground source heat pump system and a high-temperature heat pump system which are connected in series, the shallow ground source heat pump system comprises a buried pipe heat exchange system, a ground source side automatic make-up pump, a water collector, a ground source side circulating water pump, a water segregator and a ground source heat pump host, and the buried pipe heat exchange system is connected with the water collector and the water segregator; the high-temperature heat pump system comprises a heat source side circulating water pump, an evaporator, a compressor, an electronic expansion valve, a condenser, a flash evaporator, a high-temperature hot water circulating pump, a preheater and a high-temperature heat pump automatic make-up pump; according to the utility model, renewable geothermal energy and certain electric energy are utilized for assistance, high-temperature steam is output, the production load requirement of the park is met, carbon emission is avoided, carbon sink is increased, and the economic benefit is high.

The invention discloses a multi-stage impact type rotational flow grading and sorting device, which belongs to the technical field of fine mineral grading and sorting process strengthening and comprises a cylinder, a feeding pipe is arranged on the side wall of the cylinder, a central overflow pipe is arranged at the top of the cylinder, and a conical barrel is arranged below the cylinder. A first impact pipe set, a second impact pipe set and a third impact pipe set are sequentially arranged on the side wall of the conical barrel from top to bottom, and an underflow opening is formed in the bottom of the conical barrel. The cyclone bottom concentration can be diluted, materials at the bottom of the cyclone can be loosened, secondary cyclone classification and separation can be carried out on fine minerals, and therefore the classification and separation efficiency of the cyclone is improved.

The invention discloses an assistant teaching method and system based on an artificial intelligence large model, and the method comprises the steps: collecting the learning behavior data of a student, building a student learning condition model based on the learning behavior data, and carrying out the real-time diagnosis and analysis of a learning state; a knowledge graph covering teaching contents is established, so that the relation and reasoning between concepts can be conveniently searched; a hidden knowledge structure is found by using a graph neural network technology, and the organizability of teaching contents is improved; teaching content and steps are dynamically adjusted according to the learning condition and progress of the student, and personalized learning experience is provided; teaching content suitable for the learning characteristics of the target student is generated for each student; a virtual experiment environment simulating a real situation is constructed, so that students can perform practical operation; teaching strategies are adjusted in real time according to feedback of students, and high learning participation degree is kept; learning condition analysis and improvement suggestions are provided for teachers, and continuous improvement of teaching quality is promoted. The learning effect is improved, the learning experience is enhanced, and the teaching management is optimized.

The embodiments of the present application provide a method, device, computer-readable storage medium and electronic device for writing data to a storage system, the method comprising: obtaining historical data writing conditions of multiple logical address segments of the storage system; determining the writing heat of the multiple logical address segments respectively according to the historical data writing conditions of the multiple logical address segments; and performing heat grading on the data to be written according to the writing heat of the multiple logical address segments to determine the heat level of each data to be written. The data to be written with the same heat level are written into the same physical address segment of the storage system. The data to be written with the same heat level are written into the same physical address segment, so that the data is written according to the classification of heat level. Since the heat of the data in the physical address segment is relatively consistent, when the data is recovered, since the data of different heat levels have been classified, the invalid data can be recovered more effectively, the amount of data migration is reduced, and the recovery efficiency is improved.

The invention discloses a lower limb rehabilitation device and method for children with cerebral palsy, and relates to the technical field of medical treatment. Comprising a seat and a pedal mechanism arranged at the front end of the seat, the pedal mechanism comprises a permanent magnet motor, a first pedal and a second pedal, and the first pedal and the second pedal are correspondingly arranged on the two sides of the permanent magnet motor; the system further comprises a host, VR glasses, an upper computer, a permanent magnet motor driver and a detection unit of a pedal mechanism. The detection unit is arranged on the pedal mechanism and is in communication connection with the host; the VR glasses and the upper computer are in communication connection with the host; and the permanent magnet motor driver is arranged on the permanent magnet motor and is connected with the upper computer. Games presented by the VR glasses add fun to rehabilitation, multi-sensory stimulation of the VR glasses promotes plasticity of brain nerves, training time can be effectively prolonged, training frequency and intensity can be improved, a new way is developed for rehabilitation treatment of children with cerebral palsy, and the rehabilitation process of the children with cerebral palsy is powerfully promoted; the structure is simple and easy to realize, and the experience of cerebral palsy children is improved.

The invention belongs to the technical field of copper ore beneficiation, and particularly relates to a method for improving the flotation separation efficiency of micro-fine particle malachite. The method for improving the flotation separation efficiency of the micro-fine particle malachite comprises the following steps that quartz ore powder, malachite ore powder and water are mixed according to the mass ratio of 5: 1: (15-40), and first ore pulp is obtained; and a collecting agent is added into the first ore pulp, the final concentration of the collecting agent is made to range from 50 mg / L to 240 mg / L, and second ore pulp is obtained. Inorganic acid is added into the second ore pulp, flotation is conducted, and copper concentrate is obtained. Wherein the collecting agent is obtained by mixing a mixture of fatty acid, fatty alcohol-polyoxyethylene ether and polyethylene glycol according to the mass ratio of (70-82): (2-10): (8-28). The inorganic acid is selected from any one of sulfuric acid, hydrochloric acid and nitric acid. The mass concentration of the inorganic acid is 5%-25%, and 0.1 mL-0. 7mL of the inorganic acid is added into each liter of ore pulp. According to the method, the separation efficiency of the micro-fine particle malachite and the quartz is remarkably improved, and the copper recovery rate of the copper concentrate reaches 85.14%-86.6%.

The invention relates to a method for separating and recycling manganese and lead in electrolytic manganese anode slime, and belongs to the technical field of electrolytic manganese metal. Adding sulfuric acid and glucose into the electrolytic manganese anolyte, uniformly stirring, and heating to 90-95 DEG C to obtain an organic acid leaching solution; the electrolytic manganese anode slime is added into the organic acid leaching solution, leaching is conducted for 2 h at the temperature of 90-95 DEG C at the speed of 300 rpm, and then filtering is conducted to obtain a first-stage leaching solution; electrolytic manganese anode slime is added into the first-section leaching solution according to the liquid-solid ratio of 6.5-7: 1 m < 3 > / t, and a leaching solution and first-section leaching residues are obtained; adding the first-stage leaching residues into an organic acid leaching solution to obtain a second-stage leaching solution and leaching residues; activated carbon is added into a leaching solution obtained after first-stage leaching, stirring is conducted for 30 min at the normal temperature at the speed of 300 rpm, and residual organic matter in the leaching solution is adsorbed and removed; and leaching residues obtained after second-stage leaching are washed with water and dried, and lead concentrate with the lead grade ranging from 40 wt% to 50 wt% is obtained. The method has the advantages of low acid consumption, high manganese leaching rate, low treatment cost and the like.

The present application belongs to the field of non-ferrous metal dressing process, and relates to a grinding-flotation short process separation method for processing fine molybdenite. The process uses a high-pressure roller mill and a tower mill crushing and grinding process to replace the fine crushing and two-stage continuous ball milling operation in the traditional crushing and grinding process, and uses a flotation column to replace a flotation machine for flotation operation, thereby simplifying the production process flow of molybdenite. The present application has the advantages that the high-pressure roller mill and the tower mill change the crushing and grinding mode of the ore, significantly reduce the crushing and grinding energy consumption, and more effectively protect the flaky structure of molybdenite. The particle size distribution of the grinding product is reasonable, and the amount of fine and micro-fine particles (-20 μm) is reduced, thereby creating good conditions for the flotation operation. The flotation column is used for flotation, compared with the flotation machine, the recycling of middling slurry is reduced, the fine molybdenite that has been dissociated is fully recovered, and the recovery rate of molybdenite is improved. In addition, the flotation column flotation is beneficial to obtaining high-grade concentrate product, and improves the separation index and economic benefits of molybdenite.

The utility model relates to the technical field of polyester-cotton blending length grading, and discloses a polyester-cotton blending raw material fiber length grading device which comprises a measuring scale, the left end and the right end of the measuring scale are fixedly connected with limiting supporting plates, and the tops of the limiting supporting plates are connected with distance measuring sliding blocks in a sliding mode. According to the utility model, the positioning insertion plates are inserted into the distance adjusting sliding plates, and the distance adjusting sliding plates and the positioning insertion plates are two in number and are symmetrically distributed left and right by taking the measuring ruler as the center, so that the distance adjusting sliding plates can be positioned after being adjusted to proper positions and are prevented from sliding; the fixed plate is fixedly connected with the bottom of the distance adjusting sliding plate, the distance adjusting screw rod is in threaded connection with the interior of the distance adjusting sliding plate, and the distance adjusting screw rod is located at the bottom of the distance adjusting sliding plate, penetrates through the fixed plate and extends into the fixed vertical plate. The whole device can be flexibly adjusted according to different measurement requirements due to the multi-level adjusting structure.

A sealing ring is arranged at the joint between an upper shell and a lower shell, a closed containing cavity is formed, two bosses are arranged on the surface of the upper shell, a water inlet and a water outlet are formed in the top face of each boss, and a water outlet is formed in the top face of each boss. A positioning ring is arranged at the lower end of the soft rubber eyeshade cup, and a horn mouth is formed in the upper end of the soft rubber eyeshade cup; when the two eyes are placed in the soft rubber eyeshade cups, eye washing liquid sprayed by the water outlets in the soft rubber eyeshade cups conducts water flow washing on the two eyes at the same time, the washing efficiency is effectively improved, after the soft rubber eyeshade cups are detached, a user can wash, clean and store the eyeshade cups conveniently, the sealed containing cavity can effectively prevent water from entering the containing cavity, and the waterproof effect is good; the service life of the product is prolonged, the product grade is increased, and therefore the actual use requirements of users are greatly met.

The present application provides a battery integration system based on geothermal energy, including: a heat storage layer; a heat extraction device, which is placed in the heat storage layer, and the heat extraction device is provided with a working fluid inlet and a heat source outlet, and the working fluid inlet is suitable for passing the working fluid to exchange heat with the heat extraction device and generate a constant temperature difference; an in-situ power generation subsystem, which is arranged on the heat extraction device to generate electricity using the constant temperature difference; at least one level of ground power generation subsystem, which is provided with a heat energy inlet and a heat energy outlet, and the heat energy inlet is connected to the heat extraction device to obtain the heat source of the heat extraction device and generate electricity, and the ground power generation subsystem is placed in a cold source environment, and the heat energy outlet of the ground power generation subsystem is connected to the working fluid inlet so that the working fluid with a reduced temperature after power generation returns to the heat extraction device. By setting the in-situ power generation subsystem in the constant temperature gradient layer of the heat storage layer, and using the phase change of the working fluid to reduce the temperature to form a constant temperature difference, an enhanced geothermal battery can be obtained, which improves the utilization efficiency and power generation efficiency of geothermal energy.

The present invention discloses a safety coating and its application, an electrode sheet and a lithium-ion battery, and relates to the technical field of secondary battery materials. By limiting the particle size of inorganic fillers in the safety coating, the grading of large and small particles is achieved, which can make the safety coating have a denser structure, thereby reducing the probability of contact between the positive and negative electrodes, thereby improving the safety performance of the battery core. At the same time, the amount of binder in the safety coating is optimized to promote the absorption of electrolyte by the safety coating, which can improve the rate performance, low-temperature discharge performance and cycle performance of the battery core. Finally, the present invention can improve the rate performance, low-temperature discharge performance and cycle performance of the battery core while improving the safety performance of the battery core by limiting the particle size of inorganic fillers and selecting binders.

The utility model relates to the technical field of fiber plastic wood processing device, disclose a kind of fiber plastic wood production and processing device, including fixed frame, the inside lower side of the fixed frame is rotatably connected with lower press roll, the inside upper side of the fixed frame is provided with roller, the outside of the roller is equipped with embossed pattern, the left and right sides of roller are both provided with installation adjusting assembly, the left and right sides surface of roller is both fixedly connected with connecting cylinder, the inside fixed connection of connecting cylinder is equipped with sealed bearing, the side fixed connection of sealed bearing away from roller is equipped with connecting pipe. In the utility model, the cooperation of the connecting cylinder, the sealed bearing, the connecting pipe, the fixed cylinder, the partition, the deflector, the fixed plate and the communication pipe that are arranged, the temperature on the surface of the roller can be distributed in gradient, and the gradient interval can be changed continuously, so that the embossed depth changes randomly, the natural texture formed by the difference of growth environment of wood is simulated, the natural wood grain without repeated rule is realized, and the product grade is significantly improved.

The invention discloses a fuel ethanol distillation method and device using secondary steam of a superheated steam fluidized bed dryer as a partial heat source, and the device comprises a negative pressure mash tower I, a negative pressure mash tower II, a low-pressure fine tower, a high-pressure fine tower, a molecular sieve adsorber group and a superheated steam fluidized bed dryer. The fermented mature mash enters the degassing section, a part of the fermented mash with gas removed enters the negative pressure mash tower I, and the other part enters the negative pressure mash tower II, and is heated by steam to obtain crude alcohol. The crude alcohol enters the low-pressure fine tower for further distillation after acid removal and dealdehyde removal in the acid removal section, and the light alcohol at the bottom of the tower and the alcohol after distillation enter the middle and lower part and the top of the high-pressure fine tower respectively. After distillation and concentration in the high-pressure fine tower, the light alcohol enters the molecular sieve attachment group together with the concentrated alcohol sent into the low-pressure fine tower for dehydration to obtain fuel ethanol. The negative pressure mash tower II in the device of the invention directly uses the secondary steam of the superheated steam fluidized bed dryer as a heat source, thereby saving steam consumption.

The invention provides a method for discarding tailings before separation of low-grade molybdenum ore. The method comprises a coarse crushing separation process and a fine crushing process, the intermediate ore is conveyed to an intelligent sorting machine to be sorted, rough concentrate and rough tailings are obtained, the rough tailings are subjected to secondary grading through a multi-layer screen, and dry separation tailings with different particle sizes are obtained; a wet-type tailing discarding procedure: performing primary slurry making on the rough concentrate and the undersize ore, conveying the slurry into a ball mill for ore grinding, performing secondary slurry making on an ore grinding product, and performing third-time grading through a cyclone to obtain fine-grain overflow slurry and coarse-grain underflow; a collecting agent is added into the coarse-grain underflow, coarse-grain flotation is conducted, coarse-grain concentrate and coarse-grain tailings are obtained, the coarse-grain concentrate returns to the ball mill, and coarse sand and tailings are obtained after the coarse-grain tailings are classified for the fourth time; and carrying out molybdenum flotation by taking the fine particle overflow pulp as flotation feed ore to obtain molybdenum concentrate. According to the method, efficient pre-separation tailing discarding of the low-grade molybdenum ore is achieved, the solid waste amount is greatly reduced, and the resource utilization rate of the molybdenum ore is increased.

The utility model relates to the technical field of lead zinc ore beneficiation, in particular to a lead zinc ore dense medium grading selection-flotation combined separation system which comprises a dense medium separation system and a flotation system, and the dense medium separation system comprises a crushing and screening unit, a dense medium coarse fraction separation unit, a dense medium fine fraction separation unit and a fine ore water treatment unit. An outlet of the crushing and screening unit is divided into a coarse fraction outlet, a fine fraction outlet and a fine ore outlet, the coarse fraction outlet is connected with the dense medium coarse fraction separation unit, the fine fraction outlet is connected with the dense medium fine fraction separation system, and the fine ore outlet is connected with the fine ore water treatment unit. A coarse-fraction gravity concentrate outlet of the dense-medium coarse-fraction separation unit, a fine-fraction gravity concentrate outlet of the dense-medium fine-fraction separation unit and a concentrated fine ore outlet of the fine ore water treatment unit are respectively connected with the flotation system, so that the flotation system has the advantages of high economic benefit, low production cost, energy conservation, environmental protection and the like; and the lead-zinc ore beneficiation efficiency and the metal recovery rate are effectively improved.

The present application provides an opening and closing structure and a watch, the opening and closing structure comprising: a mounting plate, a meshing mechanism, a plurality of blades, a swinging member and an elastic member, the mounting plate being arranged on the movement of the watch, a through hole being arranged at the center of the mounting plate, a cam being arranged at the through hole, the cam being fixedly connected to the hour wheel on the movement and rotating synchronously with the hour wheel, the swinging member being in contact with the outer peripheral surface of the cam through the elastic member and swinging with the rotation of the cam, the swinging member being meshingly connected with the meshing mechanism, the meshing mechanism driving each blade to rotate so that the plurality of blades gather or disperse with each other. When the blades rotate clockwise, the blades disperse, and when the blades rotate counterclockwise, the blades gather, and each blade presents different patterns in the process of gathering and dispersing, and the surface of the blades can also be designed with different patterns, so that the opening and closing structure can display different patterns, ensure the aesthetics of the watch, and improve the grade of the watch.