190 results about "Dry grinding" patented technology

The invention relates to the field of tungsten carbide, and provides a preparation method of wear-resistant tungsten carbide powder in order to solve the problem that it is difficult for existing tungsten carbide to ensure high compactness while ensuring high wear resistance of a coating, and the preparation method comprises the steps that S100, by weight, tungsten carbide, cobalt powder, polyethylene glycol and alcohol are put into a ball mill to be subjected to ball milling, and slurry is obtained; s200, granulating the slurry through an atomization drying tower to obtain mixed powder; s300, sintering the mixed powder to obtain a powder block; s400, the powder blocks are made into wear-resistant tungsten carbide powder through a dry grinding machine; the tungsten carbide comprises 25 wt%-35 wt% of a first component, 28 wt%-32 wt% of a second component and the balance of a third component. The average particle size of the first component is 0.4-0.6 [mu] m, the average particle size of the second component is 0.9-1.2 [mu] m, and the average particle size of the third component is 2.5-2.8 [mu] m; the polyethylene glycol comprises a polymer of which the molecular weight distribution is 2000-20000, and the polymer of which the molecular weight distribution is 15000-20000 accounts for 50%-60%. Through grading of the tungsten carbide raw material, after the prepared tungsten carbide powder forms a coating, the coating has the characteristics of wear resistance and high compactness.

The invention discloses an architectural ceramic wetting and powdering production system, which relates to the technical field of ceramic production systems, and comprises two main process links of dry grinding and fine powder wetting, and wet ball milling and fine powder wetting. Wherein dry grinding comprises a raw material storing and batching device, raw materials in the raw material storing and batching device are classified through dry and wet raw materials, hard stone raw materials are fed into a column crusher to be crushed, and a vertical mill or a dry ball mill is selected according to the comprehensive moisture difference of the raw materials in the formula; a feeding machine in the wet ball milling is communicated with a wet ball mill, the wet ball mill is communicated with a slurry tank, and powder in the slurry tank is treated to obtain dry fine powder; fine powder wetting comprises a wetting tower, powder of the wetting tower is fed into a drum screen, and the drum screen feeds the powder into a self-flowing type powder waking bin. According to the invention, the selection of the vertical mill or the dry ball mill can be determined according to the water content in the raw material formula, and the dry fine powder is wetted by the wetting tower, so that compared with a traditional wetting mode, the wetting tower can more uniformly wet the dry fine powder.

The invention discloses a hydrogen storage alloy and a preparation method thereof, relates to the technical field of metal functional materials, and solves the problems of high reaction temperature and low hydrogen absorption and dehydrogenation rate of a magnesium-based hydrogen storage material in the prior art. The prepared hydrogen storage alloy comprises the following alloy components in parts by mass: 5-15 parts of nickel, 2-8 parts of yttrium, 2-8 parts of ytterbium, 68.8-91 parts of magnesium and 0-0.2 part of impurities. A magnesium ingot, a magnesium-yttrium alloy and a magnesium-ytterbium alloy are melted, then magnesium-nickel alloy is added, stirring is conducted till the magnesium-nickel alloy is melted, standing is conducted, and casting is conducted to obtain a hydrogen storage magnesium alloy cast ingot; the method comprises the following steps: crushing a hydrogen storage magnesium alloy cast ingot, loading into a stainless steel ball milling tank for dry milling, and adding a solvent into the tank body for wet milling after the dry milling is finished; and drying to obtain the magnesium alloy flaky powder. According to the invention, multiphase cooperation, structure regulation and interface optimization of multiple elements are utilized, so that the hydrogen absorption and desorption performance of the hydrogen storage material is obviously enhanced.

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 discloses a magnetic suspension compressor energy feedback method and system, a compressor, a medium and a program product, and relates to the technical field of compressors, the magnetic suspension compressor energy feedback method comprises the following steps: collecting the real-time bus voltage of the compressor, and when the real-time bus voltage is lower than a preset cut-in voltage threshold, controlling the compressor to enter an energy feedback mode, in the energy feedback mode, a motor of the compressor is controlled to provide electric energy for a preset voltage controller; and inputting a preset bus reference voltage and the real-time bus voltage into a voltage controller, and controlling the voltage controller to output a motor quadrature-axis current to a bus capacitor of the compressor so as to supply power to a bearing controller. The bearing controller cannot be powered off after the magnetic suspension compressor is powered off, the dry grinding condition is avoided, and the operation stability of the compressor is kept.

The invention relates to the technical field of phosphorus chemical industry solid waste resource utilization, and particularly discloses a liquid triisopropanolamine feeding device for phosphorus slag micro powder dry grinding production, which comprises a liquid storage assembly, a metering conveying mechanism, a preheating mixing mechanism, a dry grinding machine butt joint assembly and an intelligent regulation and control module. The liquid storage assembly stores materials under the protection of nitrogen and at a constant temperature; the metering conveying mechanism achieves constant-temperature and accurate metering conveying of materials through a variable-frequency plunger pump, an electromagnetic flowmeter and a pipeline with a heat preservation heat tracing function. The preheating mixing mechanism atomizes liquid triisopropanolamine through an atomizing nozzle, and the liquid triisopropanolamine and phosphorus slag raw materials are forcibly mixed to be uniform in a heating cavity through a stirring assembly. The dry mill butt-joint assembly realizes sealed conveying of the mixed materials to the dry mill; and the intelligent regulation and control module is connected with and cooperatively controls each component. The problems of large metering error, high volatilization loss, non-uniform mixing and easy blockage in the prior art are solved, and the phosphorus slag grinding efficiency, the product quality and the system operation continuity are remarkably improved.

The invention relates to a high-temperature alloy-Ti (C, N) composite metal ceramic material and a preparation method thereof, and belongs to the technical field of metallurgy. The preparation method comprises the following steps that S1, high-temperature alloy powder and Ti (C, N) ceramic powder are subjected to dry grinding, ultrasonic dispersion, wet grinding and drying, and metal ceramic powder is obtained; and S2, the metal ceramic powder is subjected to two-way pressing, vacuum sintering and cooling, and the high-temperature alloy-Ti (C, N) composite metal ceramic material is obtained. The high-temperature alloy-Ti (C, N) composite metal ceramic material prepared by the method has excellent high hardness, obdurability and high-temperature resistance, has outstanding room-temperature and high-temperature mechanical properties, and can meet the strict requirements of extreme working conditions and high-speed cutting on the comprehensive properties of the material.

The present application relates to a kind of engine pre-oiling system and method, including main oil tank and auxiliary oil tank, main oil tank is sequentially connected with main oil passage by pipeline by oil pump;Auxiliary oil tank is connected with the outlet of oil pump by corresponding pipeline with main oil passage respectively, and the pipeline connected with the outlet of oil pump is equipped with first pre-oiling pump, and the pipeline connected with main oil passage is equipped with second pre-oiling pump, and heating device is equipped on auxiliary oil tank.By increasing auxiliary oil tank and the pipeline and oil pump matched, the oil passage pressure fluctuation when engine is started first or normally is used to inject lubricating oil into auxiliary oil tank, so that when the viscosity of engine oil is increased in low temperature environment, the lubricating oil in auxiliary oil tank can be heated by heating device and sent into main oil passage, to avoid the problem of dry grinding, lubrication and damage caused by the influence of oil viscosity in bearing region.

The utility model discloses a mechanical shaft seal self-flushing circulating cooling structure and a compressor comprising the mechanical shaft seal self-flushing circulating cooling structure, the mechanical shaft seal self-flushing circulating cooling structure comprises an oil separator, a cooling pipeline, an adapter, a mechanical seal sealing cavity and a U-shaped pipeline, the adapter is located at the top of the mechanical seal sealing cavity, and the U-shaped pipeline is located at the bottom of the mechanical seal sealing cavity. The two ends of the cooling pipeline are connected to the oil distributor and the adapter respectively and communicate with the oil distributor and the adapter, and the two ends of the U-shaped pipeline are connected to the adapter and the bottom of the mechanical seal sealing cavity respectively and communicate with the adapter and the mechanical seal sealing cavity. According to the sealing structure, solid particles can be prevented from being accumulated on the sealing surface, cooling liquid stays in the sealing cavity through self weight under the condition that the whole system is stopped, timely lubrication is brought to next starting, and a sealing material is prevented from being degraded due to dry grinding and overheating; and meanwhile, the operation flexibility is improved, and the cost is reduced.

1. Name of the designed product: automatic grinder (dry grinding type). 2. Use of the designed product: grinding of blades. 3. Design points of the designed product: in shape. 4. Picture or photo that best shows the design points: perspective view. 5. The bottom surface of the designed product is the part that is not easy to see or cannot be seen during use, and the top view is omitted.

The invention provides a fault identification and processing method and control system for a high-pressure pump, and the method comprises the steps: a sensor assembly obtains the operation information of the high-pressure pump, and transmits the operation information to an MCU; the MCU determines the operation state of the high-pressure pump according to the operation information; wherein the operation state comprises a normal state, a no-load state, a bubble state and a blocking state; the MCU sends a normal instruction or a control instruction to the ECU according to the running state; and the ECU limits the operation of the high-pressure pump or controls the high-pressure pump to stop according to the control instruction. Dry grinding and high heat of the motor in a liquid-free cooling state are avoided, the temperature rise of the motor is effectively controlled, insulation aging or coil burning is avoided, and the service life of the motor is remarkably prolonged.

This invention provides a method for producing fine polyolefin powder in micrometer units, characterized by uniform particle shape, average particle size, and particle size distribution. [Solution] This invention relates to a method for producing polyolefin ultrafine powder and the polyolefin ultrafine powder produced thereby. Specifically, the method involves mixing and heating a polyolefin resin with a xylene mixed solvent to produce a polyolefin molten liquid, then cooling and crystallizing it, and then ultrafine grinding the crystallized reactant through a vacuum wet grinding step and a dry grinding step, in which wet grinding and drying are performed simultaneously with the solvent, thereby providing an ultrafine polyolefin powder with an average particle size of approximately 30 μm or less. A xylene mixed solvent is used as the mixed solvent for melting the polyolefin resin, and the ultrafine polyolefin powder produced thereby can be applied to general-purpose material fields such as construction, civil engineering, and chemical products, and has physical properties that are particularly advantageous for the manufacture of secondary battery electrodes.

The invention discloses a nitrogen-doped carbon catalyst based on weathered coal humic acid as well as a preparation method and application of the nitrogen-doped carbon catalyst. According to the method, weathered coal humic acid is used as a carbon precursor, the carbon precursor and a specific nitrogen source are mechanically ground and mixed according to the equal nitrogen proportion, and the nitrogen-doped carbon catalyst is prepared after high-temperature calcination and acid pickling. The catalyst is used for activating peroxymonosulfate (PMS) to degrade tetracycline, and under the conditions that the dosage of the catalyst is 0.2 g / L and the concentration of the PMS is 1.0 mM, the degradation rate of 20mg / L tetracycline in 30 minutes exceeds 85%. The synergistic effect of inherent trace iron in humic acid and an external nitrogen source is utilized, and high-activity sites are formed in situ in the pyrolysis process; dry grinding is adopted in the process, additional metal sources and solvents are not needed, low-cost and environment-friendly preparation of the efficient heterogeneous catalyst from waste resources is achieved, and a new material is provided for degradation of organic pollutants.

The present application relates to a kind of centrifugal compressor, including shell, rotor, inner magnetic ring and outer magnetic ring, the rotor is arranged in the shell, the inner magnetic ring is arranged on the rotor, the outer magnetic ring is arranged on the shell, the outer magnetic ring is sleeved on the inner magnetic ring and with the inner magnetic ring in the radial direction of the rotor with gap, the inner circumferential surface of the outer magnetic ring and the outer circumferential surface of the inner magnetic ring on pole opposite.The centrifugal compressor of the present application, when the rotor bears external axial force, the axial force received by the rotor is balanced by the magnetic attraction force between the inner magnetic ring and the outer magnetic ring, at least part of the axial force acting on the rotor is cancelled, to avoid dry grinding of the gas floating thrust bearing on the rotor, reduce the heating condition of the gas floating thrust bearing, ensure the stability of the rotor under different working conditions of centrifugal compressor.

The invention discloses a dry grinding preparation process of a battery positive electrode material. The dry grinding preparation process comprises the following steps: S1, temporary storage of raw materials: unpacking various solid raw materials required for preparing the positive electrode material and independently and temporarily storing the solid raw materials; s2, metering: weighing the temporarily stored raw materials according to the stoichiometric ratio of the raw materials; s3, dry grinding: conveying all the metered raw materials into dry grinding equipment, and mixing and grinding the raw materials under the action of a grinding medium and a stirring shaft arranged in the dry grinding equipment to obtain a homogeneous premixed ground material; s4, coating treatment: feeding the pre-mixed ground material and a carbon-containing coating agent into mixing equipment, and carrying out uniform coating treatment on the pre-mixed ground material and the carbon-containing coating agent; and S5, high-temperature sintering: carrying out high-temperature sintering on the coated material to prepare the positive electrode material. The invention also comprises another dry grinding preparation process of the battery positive electrode material. According to the invention, a plurality of procedures such as a stirring tank, a sand mill and spray drying in the traditional wet process are effectively reduced, the public and auxiliary energy consumption is obviously reduced, the occupied area of a plant is reduced, and the cost is reduced.

1. Name of the designed product: Dry grinder. 2. Use of the designed product: Appliance for grinding. 3. Design points of the designed product: Combination of shape and color. 4. Picture or photograph best indicating the design points: Perspective view. 5. The designed product contains color.

The invention discloses a copper slag-derived ferrotitanium piezoelectric material which is prepared by the following steps: calcining copper slag at 500-700 DEG C, crushing and sieving the calcined product, mixing with titanium dioxide and starch, performing dry grinding on the mixture for 1-3 hours, and calcining at 500-700 DEG C in an inert atmosphere, thereby obtaining the copper slag-derived ferrotitanium piezoelectric material, the ferrotitanium piezoelectric material prepared by the method has the advantages of high specific surface area, multiple reaction active sites, good catalytic performance, stable structure and the like, can be used for activating persulfate to degrade tetracycline hydrochloride, is remarkable in catalyst removal effect, and has good application value and application prospect.

The invention discloses a ceramic metallization paste, an activating agent, a preparation method and application, and belongs to the technical field of application of ceramic metallization materials.alpha-Al2O3, CaCO3, BaSO4, ZrO4, TiO2, Suzhou clay, talcum powder, water, a dispersing agent and aluminum oxide ceramic balls are mixed and subjected to ball milling, and mixed slurry is obtained; adding a binder, a lubricant and a defoaming agent, mixing and grinding; after spray granulation treatment, pressing into a ceramic blank; and carrying out high-temperature sintering, secondary ball milling and drying to obtain the activating agent for the ceramic metallization paste. The preparation method comprises the following steps: mixing molybdenum powder, manganese powder and an activating agent for the ceramic metallization paste, performing dry grinding to obtain a mixed dry material, adding a binder and grinding balls, and performing ball milling and sieving to obtain the ceramic metallization paste. By adding the activating agent, the uniform and fine ceramic metallization paste is prepared, the binding force of a metallization layer and a ceramic matrix material is improved, the sealing strength reaches 300 MPa or above, the air tightness meets the requirements of a vacuum arc extinguish chamber, and the ceramic metallization paste is suitable for industrial application.

The invention discloses high-strength, high-hardness and corrosion-resistant 304 stainless steel and a preparation method thereof, and belongs to the technical field of metal material preparation. The method comprises the following steps: carrying out ball milling on ZrC powder and 304 stainless steel powder in different shape proportions in a planetary ball mill; according to the sequence of first dry grinding and then wet grinding, ball-milling is carried out in a specific time and in a ball-to-material ratio range according to the proportion of large balls to medium balls being 4: 3: 3 and the proportion of 3: 3: 4 respectively, and fine and evenly-mixed alloy powder is obtained; and reducing initial thermal stress by adopting a spark plasma sintering technology and a multi-temperature gradient and pressure rising strategy, and subsequently completing rapid densification and inhibiting interface reaction to prepare the ZrC-304 stainless steel powder. Compared with the prior art, the 304 stainless steel has the beneficial effects that the mechanical property of the 304 stainless steel is remarkably improved, the highest tensile strength can reach 880 Mpa, the highest Rockwell hardness can reach 35.8 HRC, and the corrosion resistance is improved; after ZrC is added, grains and a second phase of the 304 stainless steel are obviously refined, and the second phase is uniformly distributed.

The invention relates to a dry grinding composite structure grinding wheel, and belongs to the field of dry grinding wheels. Comprising a plurality of elastic grinding teeth and a grinding wheel base body, and the elastic grinding teeth are wound in the circumferential direction of the grinding wheel base body to form a grinding ring; each elastic grinding tooth comprises an installation section, an elastic transition section and a working section, the installation sections and the working sections are fixedly arranged at the two ends of the elastic transition sections in a one-to-one correspondence mode, the installation sections are fixedly arranged on the end face of one end of the grinding wheel base body, and air circulation slits are formed between the elastic transition sections and the working sections of every two adjacent elastic grinding teeth. A plurality of grinding strips which are prone to generating circumferential elastic displacement when being stressed during grinding are arranged in the working section in the radial direction at intervals, each grinding strip comprises a foil base plate which is not plastically deformed when being stressed during grinding and a diamond grinding layer, the foil base plate is fixedly connected with the working section, and the diamond grinding layer is fixedly connected to the side wall in front of the rotating direction of a grinding wheel of the foil base plate. According to the grinding wheel, the phenomenon of edge bursting easily generated when the grinding wheel grinds fragile materials is eliminated, and chip removal is optimized.

The invention relates to the technical field of coal gangue recycling, in particular to a coal gangue-based sulfydryl functional material as well as a preparation method and application thereof. The coal gangue-based sulfydryl functional material is prepared by adopting a calcining alkali fusion activation and mechanochemical grafting method. A dry grinding method is adopted for modification, solution participation is not needed in the whole process, waste liquid pollution generated by traditional wet modification (such as alkali fusion and acid leaching) is avoided, the green chemical principle is met, and the environmental risk is reduced. The coal gangue is used as a raw material, high-value utilization of solid waste is achieved, meanwhile, the preparation process is simple, the cost is low, and environmental benefits and economic benefits are achieved. The prepared modified coal gangue adsorbent shows good application potential in heavy metal wastewater treatment and heavy metal contaminated soil passivation remediation, and a feasible scheme is provided for a pollution treatment strategy of treating waste with waste.

The invention discloses a sample grinding scrap iron rapid recovery processing device and method for spectrum detection sample preparation, and belongs to the technical field of belt type grinding and dry grinding, and the sample grinding scrap iron rapid recovery processing device comprises a scrap suction cover arranged in a contact area of an abrasive belt and a workpiece; an inlet of the flow guide pipeline is communicated with an outlet of the scrap suction cover; an inlet of the grading and separating unit is communicated with an outlet of the flow guide pipeline, and the grading and separating unit is used for carrying out primary separation and particle size grading on the mixture flow to obtain a coarse particle component mainly containing scrap iron and a fine particle component mainly containing dust / abrasive particles; an inlet of the high-gradient magnetic separation unit is communicated with a coarse grain component outlet of the grading separation unit to obtain iron scrap enrichment and non-magnetic or weakly magnetic tailings, and the iron scrap enrichment and the non-magnetic or weakly magnetic tailings are subjected to bin separation closed collection; an inlet of the light impurity removing unit is communicated with a fine particle component outlet of the grading and separating unit, light impurities and dust / abrasive particle impurities are separated, and the light impurities and the dust / abrasive particle impurities are collected in a separated-bin closed mode.

The invention discloses a system and method for reducing the circulating load capacity of a refractory iron ore dry-method pulverizing system, and belongs to the technical field of mineral processing engineering. In order to solve the problems that in the dry-method powder making process of refractory iron ore, due to circulation accumulation of refractory minerals in the system, the load is increased, and a dynamic powder concentrator is prone to swelling, a parallel auxiliary powder grinding subsystem is additionally arranged on the basis of an original system. According to the system, an electric bar valve and a branch pipe are additionally arranged on a coarse-fraction discharge pipe of a dynamic powder concentrator, sorted coarse-fraction materials (0-5 mm) difficult to grind are shunted to a second surge bin, and then are specially ground by second powder making equipment until the qualified fineness that the content of-74 microns is 50% + / -5% is achieved. After being collected by a second cyclone separator, the ground product is conveyed back to the main system by a second air cushion type conveyor; the dusty gas is recycled through the second circulating fan part, and the rest of the dusty gas is connected into the original dust removal system. When the circulation load of the main system exceeds a set threshold value (such as 80% of a design value), the shunt grinding process is started, and when the load is recovered to a normal range (such as below 50% of the design value), the original process is switched back. The circulating load of the system is effectively reduced, the hidden danger of material accumulation of equipment is avoided, and the operation stability of the system and the adaptability to complex ore are improved.

The utility model provides a device for preventing a pump from dry grinding, which relates to the technical field of pump structures and comprises a pump shaft, a pump shell arranged on the outer surface of the pump shaft, an impeller fixedly connected to the outer surface of the pump shaft through a convex block, and a mechanical seal arranged between the pump shaft and the pump shell. A heat dissipation mechanism for cooling and a lubricating mechanism for preventing dry grinding are respectively arranged in the mechanical seal; the heat dissipation mechanism comprises a water pump, the output end of the water pump fixedly communicates with a liquid inlet pipe, and the liquid inlet pipe penetrates through the interior of the shell and fixedly communicates with a heat dissipation copper pipe. According to the device for preventing the pump from dry grinding, through matched arrangement of the heat dissipation mechanism and the lubricating mechanism, heat generated in a mechanical seal when the pump idles can be dissipated, lubricating oil can be dripped between a movable seal ring and a pump shaft, friction heat is effectively reduced, the trouble of manually disassembling the mechanical seal is omitted, time and labor are saved, and normal operation of the pump is guaranteed.

The utility model discloses a limestone dry type grinding and pulverizing device, and relates to the technical field of limestone processing. The crushing device comprises a crushing box, two crushing rollers which are used in a matched mode rotationally penetrate through the interior of the crushing box, first gears are fixedly arranged at one ends of the two crushing rollers, the two first gears are connected in a meshed mode, a conveying belt is arranged in the crushing box, a discharging plate is fixedly installed on one side of the inner wall of the crushing box, and a discharging groove is formed in the inner wall of the conveying belt. A rotating shaft is fixedly installed on the lower surface of the inner wall of the smashing box, a rotating disc is fixedly installed at the top end of the rotating shaft, a second gear is fixedly arranged at the bottom of the rotating shaft, a third gear is connected to the outer side of the second gear in an engaged mode, and a rotating rod is fixedly arranged in the middle of the third gear; a rotating rod is rotationally mounted on the lower surface of the inner wall of the crushing box; according to the raw material crushing device, the rotating disc can be evenly paved with raw materials, then the large-particle raw materials in the rotating disc can be crushed through the pressing rollers, and the crushing efficiency is improved.

The invention relates to the technical field of spherical surface grinding, and particularly discloses a spherical surface grinding machine tool for an aluminum alloy flange. The device comprises a machine table, a frame assembly arranged on the peripheral side of the top of the machine table, a composite grinding unit for grinding the inner peripheral face and the outer peripheral face of the aluminum alloy flange, and a spherical surface grinding unit for grinding the spherical surface of the aluminum alloy flange. Firstly, an oil film on a machined surface is broken through the pre-cleaning assembly, loose impurities are removed, and the surface of a base material reaches a clean state; then, the grinding preparation is converted into a continuous grinding material thin film which is controlled in thickness and uniform in distribution from point-shaped or local supply through a spreading assembly; on the basis, the composite grinding assembly removes materials under the compound track of planet rotation and revolution, at the moment, the grinding materials play a cutting and removing role under the stable contact condition, the surface roughness of the workpiece tends to be uniform, and dry grinding, local accumulation or overcutting are reduced.

The invention provides a magnetic red-mud-based catalytic material, a preparation method thereof and application of the magnetic red-mud-based catalytic material in a slow-release system for activating persulfate, and belongs to the technical field of water organic pollution remediation. The preparation method comprises the following steps: drying, crushing and sieving red mud, adding zinc oxide, sequentially carrying out dry grinding, wet grinding and roasting to obtain a black granular substance, and cooling to obtain the red mud-based catalytic material with certain magnetism. The red mud-based catalytic material and sodium persulfate are prepared into a paraffin slow-release system, and the paraffin slow-release system is added into the polycyclic aromatic hydrocarbon polluted water, so that the release and oxidation rate of persulfate can be controlled, and the polycyclic aromatic hydrocarbon in the water body can be degraded for a long time.

To provide a carbon nanofiber group having a large aspect ratio and with size and distribution specified, and a carbon nanofiber-containing composition in which the carbon nanofibers are contained in a base resin with good dispersibility, and provide a composition in which the carbon nanofibers are dispersed well in a base material at a higher concentration than conventional products, or a molded article or coating material having the composition.SOLUTION: Provided is a method for producing a carbon nanofiber-containing composition, wherein the base material contains a group of carbon nanofibers obtained by using pitch-based carbon fibers as a raw material, subjecting the raw material to dry grinding followed by wet grinding, the group of carbon nanofibers having a diameter in the range of 30 nm or more and 1000 nm or less, and a length in the range of 0.2 μm or more and 70 μm or less, with 50% or more of the total number distributed within said ranges, the method being characterized in that the content of a sizing agent in the group of carbon nanofibers is 0.1 mass% or less.SELECTED DRAWING: Figure 7

The invention discloses an intelligent sensing visual multi-structure lining plate wet and dry dual-purpose ore grinding experiment device and method, and belongs to the technical field of mineral processing, the intelligent sensing visual multi-structure lining plate wet and dry dual-purpose ore grinding experiment device comprises a mill, a motor, a speed reducer, an intelligent monitoring module, a supporting device and a material receiving device, the mill comprises a cylinder, a lining plate supporting seat and a detachable lining plate are arranged in the cylinder and are in wedged connection through a T-shaped groove rail, and the material receiving device is arranged in the cylinder; triangular, corrugated and square lining plates can be replaced; a wet grinding ore pulp inlet and outlet is formed in the surface of the barrel, is in threaded connection with a sealing cover and a filter disc, and is compatible with a dry-wet grinding experiment process; the end cover is provided with a high-strength transparent glass observation window, the motor and the speed reducer are matched with the high-speed camera and the intelligent monitoring module, and the ore grinding state is monitored in real time. The device has the advantages of parameter adjustment, dry and wet grinding, easy replacement of the lining plate, simple structure, reliable operation, compact whole system, high grinding efficiency, low energy consumption, uniform grinding granularity and simple operation.

The invention provides a perlite powder premixing catalysis hydrophobic modification integrated granulation method and application thereof, and belongs to the technical field of inorganic non-metallic material modification. According to the method, efficient hydrophobic modification of perlite particles is achieved through a four-step integrated process of raw material premixing, paste preparation, extrusion granulation and high-temperature catalytic roasting, and the core innovation of the method is that in the high-temperature roasting stage, hydrophobic groups are released through the pyrolysis effect of a catalyst in the particles, a monomolecular hydrophobic membrane is formed from inside to outside, and the hydrophobic performance of the perlite particles is improved. Directional release and uniform distribution of hydrophobic groups are realized, and the hydrophobic groups are tightly combined with internal structures of perlite particles, so that the cost is reduced, and the operation process is simplified; in addition, uniform composite powder is formed through dry grinding, compared with a traditional distribution modification method, intermediate links are reduced through integrated premixing, the modification efficiency is improved, and the method is suitable for direct engineering application in oil-water separation, hazardous chemical substance leakage adsorption, soil remediation or VOCs tail end treatment.