513 results about "Coarse particle" patented technology

The invention discloses a method for preparing an environment-friendly magnesium aluminate spinel raw material by utilizing industrial solid wastes, and relates to the technical field of magnesium aluminate spinel raw material production. The method comprises the following steps: a, raw material synergistic purification treatment: crushing magnesium slag into coarse particles, and mixing the coarse particles with aluminum ash raw powder which is not subjected to desalting treatment according to a mass ratio of (1-3): 1 to obtain a mixture; the mixture is subjected to first heat treatment at the temperature of 450-650 DEG C in a non-oxidizing atmosphere, and heat preservation is conducted for 1-3 h; according to the method, two industrial solid wastes, namely the magnesium slag and the aluminum ash, are subjected to direct synergistic heat treatment in a non-oxidizing atmosphere, and chloride impurities in the aluminum ash are used for synchronously removing free calcium oxide on the surface of the magnesium slag and removing part of soluble salt of the aluminum ash in the volatilization and migration process, so that coupling purification of treating wastes with wastes is realized; the problem that various solid wastes need to be subjected to complex pretreatment in a traditional process is solved, the process is simplified, the impurity removal efficiency is improved, and meanwhile the risk of environmental pollution caused by solid waste stockpiling or landfill is reduced.

The invention discloses a thickener dosing control method and system, and relates to mineral processing. The method comprises the following steps: acquiring concentration values measured by an ith concentration sensor at different depths at a moment t; obtaining the turbidity T of the overflow water, the effective viscosity of the overflow water or underflow, the volume fraction of fine particles and the volume fraction of coarse particles in the overflow water, the Zeta potential of the feeding end, the Zeta potential of the overflow end, the time derivative of the Zeta potential of the overflow end, the equivalent diameter d of the particles, the density of the particles, the density of the fluid and the viscosity of the fluid; calculating the effective settling velocity of the particle swarm; carrying out online correction on the effective settling velocity by utilizing a least square method or a Kalman filtering algorithm; performing time lag correction on the concentration values at different depths by using the corrected effective settling velocity; correcting the turbidity T of the overflow water according to the corrected concentration profile; respectively calculating a flocculant dosing rate and a coagulant dosing rate; according to the invention, accurate cooperative control of the dosing rate of the flocculating agent and the coagulant is improved through the artificial intelligence model.

The invention discloses a self-adaptive air pressure regulation and control system of quartz sand unpowered powder selecting equipment, and relates to the technical field of automatic control. According to the method, wind pressure and airflow disturbance signals are collected, a high-resolution map is generated through Hampel filtering and noise reduction, features are extracted through the convolutional neural network, key influence areas are identified, the problem of unstable wind pressure caused by airflow disturbance in a mountainous area is solved, and the particle separation precision is improved; a natural potential energy distribution matrix is constructed based on building floor height difference, velocity field reconstruction and airflow channel optimization are driven, technological parameters are adjusted in combination with a gradient descent algorithm, precise utilization of natural potential energy is achieved, energy consumption is reduced, uneven efficiency is improved, airflow distribution is simulated through a fluid dynamic model, and sedimentation behaviors are analyzed and predicted through particle trajectory. A support vector machine is used for classifying tracks and generating regulation and control instructions, PID control is used for stabilizing air pressure to form a closed loop, the problems that fine powder is mixed with coarse powder, coarse particles are left and the like are avoided, the equipment blockage risk is reduced, and the product purity stability is improved.

The utility model relates to the technical field of dry grinding and dry separation of iron ore and similar processes, and particularly discloses a dry grinding and dry separation system which comprises an incoming material conveying system, a roller mill, a dynamic powder concentrator, a dry classification cabin and a fine powder collecting and conveying system. A discharging hole of the supplied material conveying system is communicated with a feeding hole of the roller mill; a discharging hole of the roller mill is communicated with a feeding hole of the dynamic powder concentrator; a coarse particle material outlet of the dynamic powder concentrator is communicated with a material inlet of the dry type grading cabin; an oversize coarse particle discharging opening of the dry type grading cabin is communicated with a feeding opening of the roller mill; and a fine powder discharge hole of the dynamic powder concentrator is communicated with the fine powder collecting and conveying system. Finished product materials with various particle sizes can be provided, and the requirements of customers for different finished product particle sizes are met; fine powder screened by the dynamic powder concentrator is collected by a dust collector and then is directly conveyed to a tailing discarding procedure, so that the handling capacity of the dry classification cabin is reduced; the use condition of the dry-type grading cabin is optimized, and the system flow is simplified.

The invention relates to the technical field of direct-current combustors. The direct-current burner comprises a nozzle body arranged at the corresponding corner of a boiler hearth, a spray head arranged at an air outlet of the nozzle body and a blade window separation mechanism, an elbow is arranged in the middle of the nozzle body, primary inertial concentration is carried out when pulverized coal airflow passes through, and the concentration a of the fire-facing side is improved; the blade window separation mechanism is arranged in the spray head, and secondary adjustable concentration is carried out when pulverized coal airflow passes through the blade window separation mechanism. When the boiler is in a low-load operation state, the elbow can enable coarse particle pulverized coal with the particle size larger than 50 micrometers to be enriched in a wall-attached mode, high-concentration wall-attached flow with the thickness larger than or equal to 50 mm is formed, and the concentration is 80%-100% higher than that of main flow; the stable combustion of the boiler in a rated load range of 15%-100% can be realized through the adjustment of the control piece; and when the load is low (less than or equal to 30% of rated load), the smoke temperature at the outlet of the hearth is increased by 30-50 DEG C, the ignition condition is improved, the smoke temperature at the inlet of the SCR denitration system is maintained to be more than or equal to 300 DEG C, and the NOx emission concentration is controlled to be below 50mg / m.

A debris flow discharge channel, comprising: a main channel through which the debris flow passes; a separation screen detachably connected to the main channel, the separation screen separating the main channel into an upper discharge channel and a lower discharge channel; a first accumulation area in communication with the upper discharge channel; a buffer channel in communication with the lower discharge channel, the buffer channel being provided with transverse energy dissipation ridges and longitudinal flow guide ridges; and a second accumulation area provided behind the buffer channel. The separation screen separates coarse and fine particles, which, in terms of service life, prevents the downstream discharge channel from being damaged by the huge impact force of coarse particles or being blocked by the accumulation, effectively prolongs the service life of the discharge channel, and, in terms of later maintenance, the separation of coarse and fine particles facilitates the maintenance and repair of the downstream main channel, thereby effectively reducing the maintenance cost in the later period.

This invention discloses a method for preparing a high-adhesion flake-shaped zinc powder pigment, belonging to the field of functional pigment preparation technology. The preparation steps are as follows: spherical zinc powder is ball-milled using prismatic irregular grinding media to obtain micro-serrated flake-shaped zinc powder; purified phosphate coupling agent, methyl methacrylate, high-purity citric acid, and a self-made high-acid-value copolymer dispersant are mixed in proportion, and ultrasonically dispersed with ethanol to prepare a composite modification liquid; the flake-shaped zinc powder is added to the modification liquid according to the liquid-solid ratio, and after gradient heating reaction, centrifugation, gradient ethanol washing, and vacuum drying, modified zinc powder is obtained; after classification, fine, medium, and coarse particle sizes are mixed in proportion to obtain the target pigment. The high-acid-value dispersant in this invention inhibits agglomeration through strong adsorption and steric hindrance, synergistically with the coupling agent and monomers to construct an active graft layer, and combined with the serrated structure to strengthen physical anchoring and chemical bonding. It exhibits stable dispersion and excellent mechanical properties, meeting the high adhesion and high corrosion resistance requirements of industrial coatings.

A method for making an iron-based oxide magnetic powder includes adding raw material solution containing trivalent iron ions, or trivalent iron ions and ions of a metal element that partially substitutes Fe sites, and an alkaline aqueous solution for neutralizing the raw material solution to a reaction system to adjust the pH of the reaction system to 1.0 or higher and 3.0 or lower. Hydroxycarboxylic acid is added to the obtained reaction solution and thereafter the pH of the reaction system is neutralized to 7.0 or higher and 10.0 or lower. The obtained precipitate of a substituent metal element-containing iron oxyhydroxide is coated with silicon oxide and then heated, whereby an iron-based oxide magnetic powder is obtained with a reduced content of fine and coarse particles, a particle shape close to a perfect sphere, and particles of ε-iron oxide in which Fe sites are partially substituted by other metal elements.

A production device for producing modified magnesium hydroxide without coarse particles comprises a semi-finished product bin (1), a first spiral reamer (2), a modification main machine (3), a cooling machine (4), an airflow powder screening machine (5), a pulse cloth bag collector (6), an induced draft fan (7), a second spiral reamer (8), a packaging machine (9), a modifier feeding port (10), a base (11), a stirring blade (12), a dust removal cloth bag (13) and a discharging port switch (14). According to the device disclosed by the utility model, the modification main machine and the airflow powder screening machine are arranged in a matched manner, the modification main machine solves the problem of modification temperature, and the airflow powder screening machine solves the problem of powder screening; the modified superfine magnesium hydroxide finished product is good in dispersing performance, free of agglomeration and excellent in flame retardant property and mechanical property; and airflow powder screening is not prone to blockage, high in screening efficiency and large in yield. The device is suitable for producing modified magnesium hydroxide without coarse particles.

The application provides a preparation device and method of nanoscale superfine powder, and relates to the technical field of calcium particle preparation, and comprises a solid-gas mixing cylinder, a positive voltage cylinder, a negative voltage cylinder and a positive-negative ion impact tube; the solid-gas mixing cylinder is provided with a feeding port for inputting animal skeleton coarse particles and oxygen to form a solid-gas mixed gas flow; the solid-gas mixing cylinder is communicated with the positive voltage cylinder and the negative voltage cylinder; the positive voltage cylinder ionizes the oxygen in the solid-gas mixed gas flow into a positive ion state, and the negative voltage cylinder ionizes the oxygen in the solid-gas mixed gas flow into a negative ion state; the outlet of the positive voltage cylinder is communicated with the outlet of the negative voltage cylinder, the solid-gas mixed gas flow with the positive ion state and the solid-gas mixed gas flow with the negative ion state are combined at the outlet and enter the positive-negative ion impact tube, the solid-gas mixed gas flow with the positive ion state and the solid-gas mixed gas flow with the negative ion state in the positive-negative ion impact tube are strongly impacted, and a large amount of energy released when the positive ion and the negative ion combine crushes the animal skeleton coarse particles into superfine powder.

The utility model provides a device for feeding CDQ powder in blast furnace injection and a powder making system, which belong to the technical field of blast furnace injection powder making, and comprise a fine powder bin, a coarse powder bin and a powder making pipe group, the fine powder bin is used for storing fine CDQ powder; the coarse powder bin is used for storing coarse CDQ powder; the pulverizing pipe set comprises a coarse powder conveying branch pipe, a fine powder conveying branch pipe, a powder collecting box body and a coal mill, the fine powder conveying branch pipe and the coarse powder conveying branch pipe are both connected with the powder collecting box body, the coal mill is arranged on the coarse powder conveying branch pipe, and CDQ powder enters the powder collecting box body after being ground by the coal mill; wherein the number of the powder making pipe sets is at least two, switching assemblies are arranged between the fine powder bin and the powder making pipe sets and between the coarse powder bin and the powder making pipe sets, the fine powder bin and the coarse powder bin are connected with the powder making pipe sets through the switching assemblies respectively, and the switching assemblies are used for controlling connection and disconnection between the fine powder bin and the powder making pipe sets and between the coarse powder bin and the powder making pipe sets. In this way, the situations that fine CDQ powder which does not need to be ground enters the coal mill, energy is wasted, the coal mill is abraded and the like can be avoided.

The invention belongs to the technical field of coal treatment equipment, and particularly relates to a mining vertical grinding device which comprises a grinding mechanism and a powder selecting mechanism, the grinding mechanism comprises a shell, a grinding disc and a grinding roller, the grinding disc and the grinding roller are arranged in an inner cavity of the shell, the powder selecting mechanism comprises a connecting cylinder arranged on the shell and a grader arranged in the inner cavity of the shell, and the inner cavity of the shell is slidably connected with a telescopic cylinder. The telescopic cylinder is fixedly connected with the connecting cylinder, one side of the shell is fixedly connected with a hydraulic cylinder, and the output end of the hydraulic cylinder is fixedly connected with the telescopic cylinder. The technical means that the hydraulic cylinder is matched with the telescopic cylinder is adopted, when the equipment treats high-humidity coal briquettes, the telescopic cylinder ascends to enable the connecting cylinder and the grader arranged in the inner cavity of the connecting cylinder to ascend synchronously, and when hot airflow carries materials to ascend through ascending of the grader, coarse particles are settled and separated at a low position due to gravity and inertia; therefore, the probability that coarse particles impact the grader can be reduced, the grader can better process fine powder, and the overall separation efficiency of equipment can be improved conveniently.

The application provides a multi-scale fluid-structure coupling coarse-grained simulation method, which is applied to CFD-DEM numerical calculation of a particle-fluid system. The coarse-grained simulation method not only equivalently regards fine particles in the particle-fluid system as coarse particle agglomerates, reduces the number of calculated particles and improves the calculation efficiency, but also provides quantitative coupling relations among fine particles, coarse particle agglomerates and fluid grids of three scales in order to characterize the non-uniform distribution characteristics of the internal particles of the coarse particle agglomerates and the flow field, and adopts a kernel function to establish mapping relations and momentum exchange models of physical quantities such as mass, velocity and force between the coarse particle agglomerates and the fine particles, and between the coarse particles and the fluid grids. Therefore, the coarse-grained simulation method provided by the application not only improves the calculation efficiency, but also guarantees the numerical calculation accuracy of CFD-DEM in the particle-fluid system.

The application provides a reduction tail gas filtering system and a dust collecting device, and relates to the technical field of chemical production. The reduction tail gas filtering system comprises a sealing part, a first through hole is arranged at the top of the outer side of the sealing part, the sealing part is connected with a dust separation device through a first pipeline, the dust separation device is connected with a filtering device through a second pipeline, and the positions of the dust separation device and the filtering device are higher than the position of the sealing part; a dust bag is arranged in the sealing part, the dust bag comprises gas phase hot silane and silicon powder, the silicon powder comprises first type silicon powder, second type silicon powder and third type silicon powder; the dust separation device is used for separating the gas phase hot silane and the third type silicon powder in the first mixture from the first mixture and conveying them to the filtering device; and the filtering device is used for separating the gas phase hot silane and the third type silicon powder. The application can provide a closed reduction tail gas filtering system for the secondary collection stage of silicon powder and prevent coarse particle dust from accumulating.

The utility model relates to the technical field of solid waste treatment, in particular to a solid waste treatment device. The utility model provides a solid waste treatment device which comprises a supporting frame and further comprises a crushing mechanism, a smashing mechanism and a screening mechanism. The crushing mechanism comprises a crushing box; the crushing mechanism, the crushing mechanism and the screening mechanism are combined into the whole solid waste treatment equipment, large solid waste is poured into the crushing mechanism to be crushed, so that small blocks capable of being crushed by the crushing mechanism are generated, and the small blocks are ground and crushed by the crushing roller in the crushing mechanism to generate small particles with irregular sizes; the small particles enter the screening mechanism, are pushed by a feeding auger in the screening mechanism and are screened by a fine particle screening hole and a coarse particle screening hole, and finally, the particles which cannot be screened are discharged from a discharge port by the feeding auger, so that the integration of crushing, crushing and screening functions is realized, multiple treatment procedures are reduced, and the working efficiency is improved.

This invention discloses a wastewater treatment control device, belonging to the field of underground coal mine wastewater treatment technology. It includes a vibrating screen mechanism and a water tank. The vibrating screen mechanism is used for primary solid-liquid separation of coal slurry water. A rotating mechanism driven by a linear drive mechanism is provided between the vibrating screen mechanism and the water tank. This rotating mechanism includes a partition section for dividing the water tank into a turbid water zone and a clear water zone, and for secondary separation of fine coal slurry particles, enabling the discharge of coal slurry from the turbid water zone and the underground utilization of the water from the clear water zone. This invention utilizes a multi-stage treatment process consisting of vibrating screening and dynamic zoned sedimentation to complete the entire process from coarse particle separation to fine particle settling and clarification underground, achieving on-site reuse of clear water and significantly reducing hoisting costs and surface treatment load. The adjustable partition plate, as a secondary treatment unit, can dynamically adjust the volume of the clear and turbid water zones, ensuring water quality stability and system shock resistance. The stirring and scraping mechanism can automatically clean the water tank and screen, reducing the burden of subsequent manual sludge removal.

The invention discloses an improvement method for soluble salt in sandy soil, which comprises the following steps: S1, screening the soluble salt-containing sandy soil, separating and removing salt-containing fine particles with the particle size less than the preset particle size, and retaining coarse-particle aggregate; s2, mixing the aeolian sand with fly ash to form a composite modifier; s3, mixing the coarse particle aggregate with the composite modifier to form a uniform mixed soil body; and S4, the mixed soil body is compacted and maintained. Fine particle bodies enriched with soluble salts are removed through physical screening, then the obtained coarse particle aggregate is combined with the aeolian sand and the fly ash to react to generate a gelling substance, the aeolian sand and the coarse particle aggregate are firmly bonded, the fly ash can adsorb and fix a small amount of salt remaining on the surface of the coarse particle aggregate, and the salt content in the coarse particle aggregate is reduced. Salt migration, crystal expansion and corrosion to the structure are effectively inhibited; furthermore, the unconfined compressive strength, the shear strength and the integrity of the improved soil body are remarkably improved, so that the soil body meets the strength and stability requirements of projects such as roadbeds and base layers.

The application provides low-sodium sandy-shaped hydrogenated aluminum hydroxide and a preparation method thereof, and relates to the technical field of aluminum oxide production. The low-sodium sandy-shaped hydrogenated aluminum hydroxide is prepared by seed crystal decomposition under the synergistic effect of three factors, i.e. regulation of supersaturation, strengthening of the growth of gibbsite (001), (110) and (100) surfaces and promotion of the agglomeration of coarse particles. In the method, the seed crystal of aluminum hydroxide after the first classification or the second classification is transferred into a sodium aluminate solution for pretreatment, and then is introduced into a seed crystal decomposition first tank together with the remaining seed crystal and sodium aluminate concentrate for seed crystal decomposition. Active seed crystal is added in the middle stage of the seed crystal decomposition. The initial temperature of the seed crystal decomposition is controlled to be 65-80 DEG C, the final temperature is controlled to be 48-60 DEG C, the decomposition rate is more than 50% in 35-50 hours, and the low-sodium sandy-shaped hydrogenated aluminum hydroxide with Na2O less than 0.15% is obtained. The preparation method has the advantages of low investment, easy industrialization, high product quality and high decomposition rate, and is beneficial to the improvement of the competitiveness of the aluminum oxide production enterprises in China.

The invention discloses an oil and gas development favorable area prediction method based on Winsored particle size mean curve simulation, and the method comprises the following steps: based on laser particle size experiment data, employing a Winsored algorithm to process rock particle size data, removing abnormal interference values, and simulating a well hole particle size mean longitudinal curve through inputting logging response parameters by means of an XLSTM-Transform hybrid neural network model; selecting a shear modulus density and a longitudinal and transverse wave velocity ratio as sensitive attribute parameters of a granularity mean value in combination with seismic data, and forming two sets of three-dimensional attribute data volumes in combination with waveform structure inversion; according to the method, model training is carried out on the nonlinear relation between the particle size mean value and the seismic sensitive attribute parameters based on a machine learning method, and finally a Winsored particle size mean value inversion body is formed, so that the spatial distribution rule of a relatively large particle size reservoir can be defined, and effective prediction of a development favorable area is realized.

The invention relates to the technical field of coal slime treatment, and discloses a desliming grading device for flotation, which comprises a conical hopper main body and a slurry feeding pipe, and further comprises a fine silt floating area, a coarse particle settling area and a buffer shunting mechanism, the buffer shunting mechanism comprises a buffer cone arranged below the slurry feeding pipe, and the outer part of the buffer cone is fixedly connected with a buffer cylinder; slurry feeding openings are formed in the outer portion of the buffering cylinder at equal intervals, a connecting piece is arranged at the top of the buffering cylinder, and the water feeding mechanism is arranged at the junction of the fine silt floating area and the coarse particle settling area. Coal slurry fed through the slurry feeding pipe can fall on the buffer cone and is shunted along the conical surface, one part of the coal slurry shunted along the conical surface enters the buffer cylinder to be retarded, and the other part of the coal slurry is obliquely output into a fine silt floating area through the circumferential slurry feeding port, so that the coal slurry is discharged from the buffer cylinder to the fine silt floating area. The coal slurry entering after being buffered and shunted by the buffer cone and the buffer cylinder can reduce the impact on a coarse particle settling area and the damage to an ascending water flow field, so that the desliming and grading effects are improved.

The utility model discloses a square swinging screen feeding pre-screening device, which belongs to the technical field of screening equipment and comprises a lower end connecting seat used for being connected with a square swinging screen, the top of the lower end connecting seat is connected with a fine particle temporary storage barrel, and the periphery of the fine particle temporary storage barrel is communicated with a fine particle discharging pipe. The top of the fine particle temporary storage barrel communicates with a coarse particle temporary storage barrel, the periphery of the coarse particle temporary storage barrel communicates with a coarse particle discharging pipe, a transverse rod is welded to the vertical inner wall of the coarse particle temporary storage barrel, a motor is installed on the side face of the transverse rod, and an output shaft of the motor is connected with a driving fluted disc through a coupler; a conical limiting seat is installed on the inner bottom wall of the fine particle temporary storage barrel, a rotary air inlet pipe is rotationally connected into the conical limiting seat, and the square swinging screen feeding pre-screening device improves the net cleaning and anti-blocking capacity, the material flow speed is increased, the effective screening area is increased, and the overall screening efficiency is improved.

The application discloses a kind of based on bentonite-based mineral gel subgrade slope double-layer anti-seepage reinforcement method, belong to road engineering anti-seepage reinforcement technical field, including bottom coarse-grained anti-seepage layer, top fine-grained anti-seepage layer, slope anti-seepage layer, after mixing coarse-grained bentonite-based mineral gel particles with bottom coarse-grained soil particles, water curing, paving compaction forms bottom coarse-grained anti-seepage layer, after compaction, continue to fill in the slope anti-seepage layer near the slope of subgrade, layer by layer, finally, after mixing fine-grained bentonite-based mineral gel particles with top fine-grained soil particles, water curing, paving compaction forms top fine-grained anti-seepage layer.The application has the advantages of significant anti-seepage effect, strong freeze-thaw resistance and strong environmental adaptability using the above-mentioned based on bentonite-based mineral gel subgrade slope double-layer anti-seepage reinforcement method, effectively hinders groundwater rise, rain and snow water infiltration and slope seepage reinforcement effect, avoids cracking and collapse of subgrade in permafrost region during operation.

The invention belongs to the technical field of artificial diamond processing, and relates to a raw material pretreatment device and method applied to an artificial diamond synthesis process, and the method comprises the following steps: selecting graphite powder with the purity not lower than 99.9% as a carbon source main material, screening through a 100-mesh standard sieve, removing coarse particles with the particle size larger than 150 microns and impurities, and collecting screen underflow for later use; meanwhile, metal catalyst powder with the particle size of 5-10 microns is selected, the screened graphite powder is placed in plasma treatment equipment, inert gas is input to drive the graphite boat body to rotate in the furnace, it is ensured that all the surfaces of the biscuit can make continuous and uniform contact with the high-temperature inert gas, and therefore the sintering temperature of the biscuit is increased; the problem of uneven heating caused by the near-heat and far-cold effect in the static oven is fundamentally solved; and the biscuit is uniformly dehydrated and purified in all-dimensional hot air flow, so that insufficient pretreatment caused by local overheating or insufficient temperature is effectively avoided, and the quality stability of a final artificial diamond product is greatly improved.

The application relates to the technical field of powder production and processing equipment, in particular to a flow guide device for airflow mill pulverization and a pulverizer adopting the flow guide device, wherein the flow guide device for airflow mill pulverization comprises a device body, a flow guide area, a collection area and a drainage area are formed in the device body, and the collection area and the drainage area are distributed around the flow guide area; when the device body is matched with a pulverization cavity and the pulverization cavity is in a working state, airflow sprayed from a nozzle flows to the lower part of the collision area after collision in the middle of a pulverization area and then flows into the flow guide area and the drainage area in sequence; the collection area collects coarse particles sinking downwards, the collection area is formed with an opening, coarse particles in the collection area can flow out through the opening, the flowed-out coarse particles can flow into the drainage area together with airflow and flow out of the drainage area; the flowing direction of airflow flowing out of the drainage area is towards the top of the pulverization cavity. The flow guide device for airflow mill pulverization can improve powder preparation efficiency and improve the vortex state at the bottom of the pulverization cavity.

The invention belongs to the technical field of mineral separation, and particularly relates to a method for improving the tungsten recovery rate through ceramic ball regrinding and recleaning of coarse-grain table tailings. According to the method, coarse grain raw materials are subjected to ore grinding to obtain an ore grinding product, the coarse grain raw materials comprise coarse grain table tailings, ore grinding media used for ore grinding comprise steel balls and ceramic balls, the filling rate of the steel balls is 16-20%, and the filling rate of the ceramic balls is 22-25%; and the ore grinding products and the scavenging table middlings are screened and classified, undersize products and oversize products are obtained, the oversize products are returned for ore grinding, the undersize products are sequentially subjected to flotation and table roughing, and tungsten concentrate is obtained. According to the method, the argillization degree of the tungsten ore can be controlled from the source, the monomer dissociation degree of useful minerals can be improved, the adverse effect of iron pollution on the flotation desulfurization procedure is reduced, and the method has important significance in improving the comprehensive recovery rate of tungsten resources.

The present invention provides a method for producing an inorganic particle-containing slurry, by which the number of coarse particles can be sufficiently reduced. The present invention is a method for producing an inorganic particle-containing slurry, which comprises: a step of preparing an inorganic particle dispersion containing inorganic particles and a dispersing medium, and having a pH less than the isoelectric point of the inorganic particles; and a step of adding an alkaline compound to the inorganic particle dispersion in such a manner that the pH does not reach the isoelectric point of the inorganic particles.

This invention belongs to the field of crucible preparation technology, specifically relating to a method for preparing an alumina crucible, comprising the following steps: Step 1: preparing a mixed solution and placing it in a ball mill; Step 2: obtaining a composite alumina slurry in the ball mill; Step 3: preparing composite alumina powder from the composite alumina slurry; Step 4: adding a binder to the composite alumina powder to obtain an alumina mixture; Step 5: molding the alumina mixture using a mold to obtain a crucible blank, wherein the mold forming process is a double-sided suction process. Compared with the prior art, the advantages and positive effects of this invention are: the double-sided suction process adsorbs fine particles in the material onto the product surface, while coarse particles are located in the middle layer of the product, thereby greatly improving the surface roughness of the finished alumina crucible, making the size of the alumina crucible more controllable, eliminating the need for a wax removal process, and effectively reducing the risk of the surface of the finished alumina crucible peeling off during use.

The utility model belongs to the technical field of coal dressing, and particularly relates to coal dressing equipment with a dust collecting function, which comprises a base, and the top of the base is fixedly connected with a support rod; coal preparation equipment is fixedly connected to the end part of the supporting rod; motors are fixedly connected to the end parts of the coal preparation equipment and are symmetrically arranged; the output end of the motor is fixedly connected with a rotating rod, and the other end of the rotating rod is rotationally connected to the inner side wall of the coal dressing equipment. The end part of the rotating rod is fixedly connected with a crushing roller; then the cyclone dust collector is started, so that the cyclone dust collector generates suction force through the dust collecting pipe to suck the generated dust into the dust collecting pipe, and then the cyclone dust collector separates coarse particle dust in the airflow by utilizing centrifugal force, so that the treatment efficiency is improved; as primary pretreatment, the load of subsequent equipment is reduced, and collected coarse particles can be directly returned to a production process or used as low-value byproducts.

The application discloses a coal gangue treatment system and a treatment method. The coal gangue treatment system comprises a crushing assembly, a screening assembly and an air jigging assembly. The crushing assembly is used for crushing coal gangue. One end of the screening assembly is connected with one end of the crushing assembly, so that the crushed coal gangue flows into the screening assembly. The screening assembly is used for screening the crushed coal gangue into coarse particles, fine particles and target particles according to particle size. The other end of the screening assembly is connected with the other end of the crushing assembly, so that the coarse particles screened by the screening assembly flow into the crushing assembly. The air jigging assembly is communicated with the screening assembly, so that the target particles flowing out of the screening assembly flow into the air jigging assembly. The air jigging assembly is used for sorting according to the density of the target particles. The air jigging assembly is communicated with the crushing assembly, so that the light material flowing out of the air jigging assembly flows into the crushing assembly. The coal gangue treatment system has the advantages of high treatment efficiency and low cost.

The invention relates to a colorimetric method-based rapid detection device and method for organic matters in industrial byproduct gypsum. The colorimetric method-based rapid detection device comprises a sample introduction and pre-dispersion module, an extraction reaction module, a pneumatic cyclone separation and refined filtration module, a color development mixing module and a colorimetric detection module, the sample injection and pre-dispersion module realizes continuous quantitative conveying and mixing of samples, the extraction reaction module performs micro-cutting type enhanced extraction on particles by utilizing an acoustic streaming effect generated by high-frequency standing waves, and the pneumatic cyclone separation and fine filtration module realizes rapid and efficient solid-liquid separation through tangential gas injection enhanced cyclone and in cooperation with an air flotation effect. The developing and mixing module is used for automatically and quantitatively mixing reagents. According to the invention, automation and continuity of the whole process from coarse particle sample feeding to organic matter content result output are realized, the detection time is greatly reduced, and the method is especially suitable for rapid quality monitoring of production and application sites of industrial by-product gypsum such as ardealite and the like.