821 results about "Coarse particle" patented technology

The invention relates to the technical field of chemical raw material processing, and discloses a petroleum coke particle size grading and batching system which comprises a raw material pretreatment module, a multi-stage dynamic screening module, a particle size real-time monitoring module, an intelligent batching decision module and a closed-loop control execution module. The classification definiteness of materials with different particle sizes is ensured; meanwhile, through a particle size monitoring feedback mechanism, the particle size distribution abnormal state in the screening process is recognized in real time, the material purity within the target particle size range is guaranteed, the particle size grading accuracy is improved, a closed-loop matching decision module is arranged, particle matching weight parameters are dynamically optimized in combination with the electrolytic aluminum process requirement, and the particle size grading accuracy is improved. The deviation degree between the ingredient proportion and the target performance can be judged in real time; the speed ratio of the conveying belt and the opening degree of the stock bin are automatically corrected through the executing mechanism, it is guaranteed that the mixing proportion of coarse particles, medium particles and fine particles is always in the optimal interval matched with electrolytic aluminum anode production, and the quality stability of anode carbon blocks is improved.

The invention relates to the technical field of ore particle screening, and discloses high-recovery-rate micro-fine-particle magnetite ore dressing equipment which comprises a mounting frame, a protective shell is fixedly mounted on the mounting frame, a screening assembly is arranged on the protective shell, and the screening assembly comprises a three-way pipe. In order to enable the high-recovery-rate micro-fine-particle magnetic iron ore preparation equipment to be suitable for efficient separation of high-added-value micro-fine-particle iron ore, the screening assembly is arranged, the screening assembly is matched with a power motor to drive a large belt wheel through a small belt wheel and a transmission belt, an output shaft drives an auger rod to push ore in a three-way pipe, feeding blockage is avoided, and the high-recovery-rate micro-fine-particle magnetic iron ore preparation equipment is suitable for efficient separation of high-added-value micro-fine-particle iron ore. And meanwhile, a centrifugal motor drives a trilateral frame to drive a centrifugal screen drum to rotate at a high speed, fine particles fall into a discharging hopper through screen holes by utilizing centrifugal force, and coarse particles are discharged from a first discharging pipe through a mounting drum. And the stirring paddle rotates synchronously to prevent the fine particles from accumulating in the funnel.

The invention discloses a method for preparing a low-clinker composite mortar material from granite weathered construction engineering residue soil and mortar. The method comprises the following steps: settling and screening engineering residue soil, and respectively carrying out biomimetic mineralization modification, particle size allocation and proportioning on powdery clayey soil and coarse particles to form mixed mortar; according to the mixed mortar, granite weathering type constructional engineering muck solid waste can be fully utilized, the recycling rate reaches 96%, the performance of the mortar is improved by introducing a biomimetic mineralization modification technology, conditions are mild, no harmful by-products exist, and the mechanical performance of the composite mortar is excellent. Through a biomimetic mineralization modification technology, after the prepared mortar is cured for 28 days, the highest compressive strength can reach 65.45 MPa, and the compressive strength is superior to that of traditional OPC mortar, fly ash composite mortar and untreated muck mortar.

The invention discloses a grading grinding vertical mill and a using method thereof, and relates to the technical field of vertical mills.The grading grinding vertical mill comprises a mill shell, a millstone grading rotor and an eddy current restraining flow guide cover assembly, the grading rotor is fixedly installed on the upper portion of the inner wall of the mill shell, and a millstone is fixed below the grading rotor; and a vortex suppression flow guide cover assembly is fixedly mounted on the inner wall of the mill shell and located on the periphery of the grading rotor, and the vortex suppression flow guide cover assembly is used for guiding airflow to uniformly and stably flow to a blade area of the grading rotor. According to the invention, the eddy current suppression flow guide cover assembly is mounted, so that active suppression of three-dimensional turbulence in a classification area is realized, the problems of over-grinding of fine powder and running of coarse particles caused by airflow turbulence induced by a high-speed rotor are solved, the classification precision is improved, and the classification power consumption is reduced.

The invention discloses a shield muck heavy metal pollution intelligent sorting system and method based on multi-parameter online detection, and relates to the field of shield muck sorting, the shield muck heavy metal pollution intelligent sorting system comprises a muck sample pretreatment module, an online detection module, a pollution evaluation analysis module, a sorting execution module and a linkage control feedback module; the muck sample pretreatment module is used for separating coarse particles with the particle size larger than 50 mm and impurities in shield muck through a vibrating screen. According to the method, the initial value of the fine-grained soil content is detected in real time, data is automatically corrected based on a preset intelligent densimeter and a traditional densimeter difference correction model, rapid measurement is achieved, the detection efficiency is improved, a dynamic correlation model of fine-grained soil component changes is constructed by combining auxiliary parameters such as the muck weight, the water content and coarse grain grading, and the detection accuracy is improved. And the working condition adaptation module is linked to automatically improve the fine-grained soil detection frequency when the stratum mutation is identified by the shield PLC parameters, so that the data is ensured to closely follow the stratum change.

The invention belongs to the technical field of polyether refining, and particularly relates to a methyl-terminated polyether refining treatment method. Comprising the following steps: adding water into a to-be-refined methyl-terminated polyether sample, stirring, dissolving salt in water, layering, adding water into a polyether layer again after separation, stirring, layering, and separating to obtain a primary sample; taking a methyl-terminated polyether sample to be refined again, heating, adding water, adjusting the pH with acid, and stirring to obtain a sample A; adding the preliminary sample into the sample A, and stirring to obtain a sample B; and adding acid into the sample B to adjust the pH value, continuously stirring, crystallizing the metal salt into large particles, settling, separating out solids, deacidifying and decolorizing, dehydrating in vacuum, and filtering to obtain qualified methyl-terminated polyether products, and intercepting part of qualified products as preliminary samples for continuous production. By adding the methyl-terminated polyether primary finished product, the crystallization process of the metal salt can be effectively improved, so that the metal salt tends to generate coarse particles easy to filter, the filtering resistance is reduced, and the filtering period is shortened.

This invention proposes a method for screening vein quartz raw materials to prepare high-purity quartz sand with low gas-liquid inclusions. The screening method includes the following steps: selective crushing and dissociation—scrubbing and washing—dehydration and classification—atomized chemical application—surface modification—polishing and homogenization—machine vision-based sorting of coarse particles for pre-selection and tailing—screening of low-gas-liquid inclusion particles based on transparency differences—gradation and utilization of raw material particles of different grades. This invention achieves the screening of high-purity quartz raw materials with low gas-liquid inclusion content and the grading and utilization of high-purity quartz raw materials with different transparency levels by controlling the particle size, surface modification, and transparency optimization of quartz raw materials, and by sorting according to differences in particle transparency. This effectively reduces the contamination of high-gas-liquid inclusion impurities on high-quality quartz sand products after sand making.

The utility model relates to the field of dust removal, and particularly discloses a centralized dust removal device for a lithium battery cell production workshop, which comprises a one-way anti-explosion valve, a dust removal device body, a filter and a cooler, the dust removal device body comprises a filter box body, an air outlet is formed in one side of the top of the filter box body, an air outlet grating is connected in the air outlet, a filter cylinder is fixedly connected in the filter box body and located below the air outlet, and flow disturbing is conducted on entering gas through a baffle, so that the moving speed of the entering gas can be reduced, and the dust removal effect is improved. When the filter element is cleaned, the moving speed of the dust is slowed down, at the moment, due to the gravity settling effect, coarse particle dust in the gas directly falls into the dust collecting box, so that the pre-dust-removing effect is achieved, excessive dust can be prevented from being attached to the filter element, the frequency of cleaning the filter element is reduced, and the working efficiency is improved.

The invention provides a supergravity dust removal device integrating rotary atomization and filling. The supergravity dust removal device comprises a shell, a first motor, a demisting module, a filling layer, a liquid distributor and a second motor, the shell is provided with a gas outlet, a liquid inlet, a gas inlet and a liquid outlet, and the gas inlet is used for introducing coal gas; the filler layer is arranged in the shell, is connected with the output end of the second motor and is used for improving the gas-liquid mixing effect and the dust trapping efficiency in a rotating state; the liquid distributor is communicated with the liquid inlet, a plurality of atomizing nozzles are arranged on the liquid distributor, and liquid is atomized and then sprayed to the filler layer; the demisting module is arranged above the liquid distributor, the demisting module and the liquid distributor are jointly connected with an output shaft of the first motor, and the demisting module and the liquid distributor are used for separating liquid drops and particles in the gas in a rotating state. According to the dust removal device, inertial sedimentation of coarse particles and supergravity separation of fine particles can be integrated, and graded dust removal and liquid removal are achieved.

The invention provides a mechanical stirring type coarse particle fluidized bed flotation device and method.The groove body structure of a flotation groove comprises an inner groove body and an outer groove body, the inner groove body is arranged in the outer groove body, and a circulation channel is formed between the inner groove body and the outer groove body; the ore feeding distribution device is arranged at an ore feeding inlet in the upper part of the flotation tank body; the stirring device comprises a stator and an impeller which are arranged in the flotation tank body; the flow guide hole grid plate is arranged in the inner groove body and located above the stator and the impeller. Stable rising water flow is generated through the suction effect of the impeller and the circulation channel, the fluidization flotation process can be achieved without adding extra clear water, and the problem that a fluidization flotation column is large in water consumption is solved. The flow guide hole grid plate is arranged in the inner tank body, so that disordered fluid coming out of an impeller stirring area is converted into uniform and stable rising fluid, and the stability of a bed layer and mineralized bubbles is improved. The problems that a traditional flotation machine is poor in coarse particle recovery effect, and a fluidization flotation column is large in water consumption and poor in fine particle selectivity are solved.

Equipment for crushing and grading magnesium oxide comprises a composite grading machine, a striking crushing and stripping machine, a spiral feeding machine, a circulating fan, a cyclone separator, a bag-type dust collector and an air compressor, and is characterized in that a crushing and grading unit is upgraded and grafted on the magnesium oxide crushing and grading equipment by utilizing the air flow advantage of closed-loop circulating air; on the basis of ensuring that the content of MgO is not reduced due to the influence of moisture and CO2 in air in the crushing and grading process, heavy MgCO3 fine powder and coarse MgO powder in raw powder are separated and graded to the maximum extent, and a low-grade magnesium oxide product containing a small amount of MgCO3 is obtained through an outlet of a 1 # air-lock valve of a composite grading machine; a high-grade magnesium oxide fine powder main product is obtained through an outlet of a second air-lock valve of the cyclone separator, and a high-grade magnesium oxide superfine powder product is obtained through an outlet of a third air-lock valve of the bag-type dust collector. By adopting a simple mode of coarse particle stripping shell shrinkage crushing instead of coarse particle grinding, the non-calcined magnesite powder is prevented from entering the fine powder, and the amount of the magnesium oxide fine powder is also increased. Operation is simple and easy to control, productivity efficiency is high, production is safe and environmentally friendly, and market application prospects are wide.

A steel material of the present disclosure has the chemical composition described in the specification, Fn defined by formula (1) is 0.45 to 1.05, at a depth of 0.08R from a surface of the steel material (R is a radius), a number density of fine Bi particles, which are Bi particles having an equivalent circular diameter of 0.1 to 1.0 μm, is 15.00 pieces / mm2 or more and a number density of coarse Bi particles, which are Bi particles having an equivalent circular diameter of 10.0 μm or more, is 0.25 pieces / mm2 or less, and at a depth of 0.65R from the surface of the steel material, the number density of the fine Bi particles is less than 15.00 pieces / mm2 and the number density of the coarse Bi particles is more than 0.25 pieces / mm2.

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 production process of spherical alumina powder with high purity and low uranium content, which comprises the following steps: by taking angular alumina with the uranium content of 50-100ppb as a raw material, sequentially carrying out flame melting spheroidization, gradient pickling, hydrothermal strengthening uranium removal, wet grading coarse grain removal, low-temperature drying and airflow depolymerization to finally obtain the finished product spherical alumina powder with the uranium content of less than 30ppb. Through a multi-stage uranium removal system including incoming material management and control, gradient pickling, hydrothermal coupling and particle size optimization, the traditional single pickling efficiency bottleneck is broken through, and deep dissolution of lattice uranium and effective removal of coarse-grain uranium enrichment nuclei are achieved; the morphology and the specific surface are locked through whole-process low-temperature hydrothermal and low-shear drying, so that the powder is ensured to be used as a filler in resin sealing materials of high-integration integrated circuits, large-scale integrated circuits and super-large-scale integrated circuits, and the powder has the comprehensive performance of high filling, low thermal resistance and zero alpha-ray soft errors; and the limit requirements of node packaging materials of 3nm and below are met.

The invention relates to a resourceful treatment method for a bauxite ore washing tail mud reservoir, which comprises the following specific steps: 1, carrying out cyclone classification on tail mud in the tail mud reservoir, and separating out coarse particles with A / S greater than or equal to Y and A / Slt; and Y fine particles. And 2, carrying out flotation treatment on the coarse particles. And potassium carbonate is added as a dispersing agent and a pH value adjusting agent, the pH value of the ore pulp is adjusted to 8.0-10.5, then sodium oleate is added as a collecting agent, and finally bauxite concentrate and flotation tailings are obtained. And 3, dehydrating the fine particles to obtain dehydrated tail mud with the water content of less than or equal to 20%. And 4, adding the flotation tailings and the dehydrated tail mud into a curing agent or a soil conditioner to form cultivable soil which is used for ecological restoration of the stony desertification area. Potassium carbonate is used for replacing sodium carbonate to reinforce flotation, so that tailings can be used as potassium-rich cultivation soil; the dam break risk can be eliminated after the tail mud is dehydrated; tailings and fine particles are compounded to form cultivation soil to treat stony desertification, silicon fertilizer is synchronously produced, the annual income is larger than or equal to 0.3 million yuan, and safe, resource and ecological cooperative treatment is achieved.

The invention discloses graphite battery negative electrode material testing and sampling equipment, and particularly relates to the technical field of battery negative electrode material reaction treatment, the graphite battery negative electrode material testing and sampling equipment comprises a base, a crushing and shunting assembly is arranged on the base, and the crushing and shunting assembly comprises a reaction kettle body arranged at the top of the base. Through a stepped crushing structure of the spiral crushing belt and the twisting ring, and a centrifugal force field eddy current effect formed by rotation of the inclined grinding block, three-stage treatment of materials is realized. Wherein the spiral lead angle design of the spiral crushing belt can ensure that blocky materials are uniformly stressed in the axial direction, and local over-crushing is avoided; the gap between the twisting ring and the base plate is adjustable and can adapt to test scenes with different particle size requirements; the powder can be automatically graded according to the particle size through the eddy current effect generated by rotation of the inclined grinding block, qualified particles are accurately filtered and deposited through the filter screen cover, coarse particles flow back to the crushing cavity through the guide cylinder to be continuously treated, and the problem that particles are not evenly distributed in an existing quartering method sampling process is effectively solved.

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 invention relates to the technical field of dust removal equipment, and discloses a dust falling and removing device for metal powder processing, which comprises a dust removal tank, an air supply pipe and a water drainage pipe are respectively arranged at the upper end and the lower end of the dust removal tank, and the air supply pipe is connected with the outlet end of dust suction equipment; and the sprayer is arranged above the air supply pipe and is connected with water supply equipment through a water supply pipe. The sprayer adopts the combination of concentric annular pipes and branch pipes, atomizing nozzles are uniformly distributed on the lower end face to form a three-dimensional spraying area which covers the cross section of the whole dust removal tank, the upper end of a spiral blade of a spiral auger extends to an air outlet of an air supply pipe, large-particle dust in air flow is preliminarily intercepted during rotation, and the large-particle dust in the air flow is uniformly sprayed in cooperation with water mist sprayed above. And the inclined plane design at the upper end of the guide cylinder guides airflow to gather towards the center, so that the contact density of water drops and dust is further improved, effective sedimentation of micron-sized dust is ensured, and meanwhile, the energy loss is reduced.

The invention relates to the field of diamond saw blades, and discloses a diamond saw blade and a preparation method thereof.The saw blade comprises a cutter body and a cutter bit, and the cutter bit is prepared from, by mass, 10-25 parts of diamond particles; 18 to 25 parts of cobalt powder; 15 to 28 parts of tungsten powder; 8 to 14 parts of nickel powder; 15 to 22 parts of copper powder; 8 to 14 parts of iron powder; 8 to 12 parts of copper-tin alloy; 2-5 parts of manganese powder; and 0.5-2 parts of a heat-resistant phase. The diamond particles are subjected to multi-particle-size grading matching, so that coarse particles guide cutting, fine particles fill gaps of the coarse particles, a compact structure is formed, and the effect of improving the density of the tool bit and the cutting stability is achieved. Compared with a formula only using single-particle-size diamond particles in the prior art, the problems of loose particle accumulation, stress concentration and easy cracking are solved.

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 present invention relates to a method for preparing a polycrystalline diamond composite sheet. The method comprises the following steps: soaking diamond particles of primary and secondary sizes in strong acid and alkali, and repeatedly washing with pure water; sandblasting a cemented carbide substrate; mixing the primary and secondary diamond particles in a mixer; placing the mixed diamond particles and cemented carbide substrate in a high-temperature resistant metal cup; placing a composite block in the metal cup, and placing the metal cup in a six-sided top press; and performing three-stage high-pressure and two-stage high-temperature sintering. The first stage is high-pressure, cold pressurization to 6.5-8.2 GPa, maintained for 30-60 seconds; the second stage is high-pressure and simultaneous heating, sintering at a pressure of 6-8 GPa, a temperature of 1490-1580°C, maintained for 300-600 seconds; and the third stage is high-pressure and simultaneous heating, pressure of 5.0-6.0 GPa, a temperature of 1150-1250°C, maintained for 150-200 seconds. The pressure and temperature are then reduced to normal pressure and room temperature to obtain a polycrystalline diamond composite sheet blank. After sintering, fine particles are evenly distributed around coarse particles.

The invention relates to the technical field of industrial detection, and discloses a high-precision petroleum coke moisture content analysis system, which comprises a petroleum coke multispectral characteristic processing module, a moisture analysis algorithm matching module and a moisture content execution module, petroleum coke is finely divided into three independent analysis levels of fine powder, medium particles and coarse particles according to particle sizes, detection weights are dynamically distributed based on mass proportions of all the particle sizes, when the proportion of the fine powder exceeds a critical threshold value, the system automatically improves the detection weights of the fine powder, the high water absorption characteristic of the fine powder caused by sharp increase of the specific surface area is captured, and the detection accuracy is improved. Aiming at the capillary moisture adsorption phenomenon caused by fine powder enrichment, the system generates a compensation coefficient positively correlated with the fine powder concentration in real time, the structural deviation caused by neglecting the particle size-moisture relevance in a traditional method is eliminated, the detection precision of a high-fine powder sample reaches a new height, a three-dimensional moisture distribution diagram is constructed through a distributed sensor network, and the detection precision of the high-fine powder sample is improved. The inherent defect that materials are regarded as a static homogeneous system in a traditional method is overcome.

A process for producing a supplementary cementitious material (SCM) 114, comprising the steps; providing a calciferous feedstock 101, determining, before and / or after size reduction, the free lime content of the calciferous feedstock, subjecting the calciferous feedstock to size reduction 102 under phase transition conditions effective to produce a first crude particulate material, and thereby reducing the free lime content of the calciferous feedstock, and if the free lime content determined prior to size reduction is greater than about 4 wt.%, optionally reacting the first crude particulate material to produce a second crude particulate material with a reduced free lime content of below about 4 wt.%, or if the free lime content determined after size reduction is greater than about 1 wt.%, optionally reacting the first crude particulate material to produce a second crude particulate material with a reduced free lime content of below about 1 wt.%, and processing the first and / or second crude particulate material to give the supplementary cementitious material 114, wherein the calciferous feedstock 101 comprises slag. The size reduction may be achieved by atomisation or granulation. Further processes, as well as systems and products thereof, are also defined.

The invention discloses graded metal powder for cold metal fusion additive manufacturing, which is characterized in that metal powder with different particle sizes is graded to form multimodal particle size distribution powder, and the metal powder with different particle sizes is compounded in a gap filling manner; multi-peak particle size distribution powder obtained by grading metal powder of various particle sizes balances the fluidity and the stacking density, the metal powder of different particle sizes can be subjected to gap filling, for example, coarse particle powder dominates the fluidity, the CMF powder laying uniformity is ensured, gaps of the coarse particle powder are filled with medium particle powder, and the CMF powder laying uniformity is ensured. And then superfine particle powder is adopted to fill the remaining gaps, the superfine particle powder provides a high specific surface area, and the sintering driving force is improved. Compared with single powder, the tap density obtained through powder grading is increased by more than 10%. And the CMF process can be well adapted through the graded metal powder, the thickness of a powder laying layer can be better matched, and interlayer dislocation is avoided.

The utility model discloses an energy-saving variable-frequency speed regulation ball mill for realizing narrow-fraction ore grinding, and belongs to the technical field of ball mills. The output end of the cylinder body is provided with an ore discharge chute, the surface of the ore discharge chute is provided with a grading chute, the bottom of the grading chute is provided with a demagnetizing elbow, the output end of the demagnetizing elbow is provided with a fine-fraction electronic scale, and one side of the fine-fraction electronic scale is provided with a coarse-fraction electronic scale; and recovery chutes are arranged at the output ends of the coarse-fraction electronic scale and the fine-fraction electronic scale. According to the utility model, after the ore discharge chute and the grading chute are used for sampling at regular time and the demagnetizing elbow is used for eliminating residual magnetism of ore discharge products, coarse and fine fuzzy grading is completed on the electronic scale by utilizing the high flow rate of ore pulp and the inertia and sedimentation characteristics of minerals with different size fractions; and only the proportions of the coarse and fine fractions of the ore grinding products in different time periods are compared, so that the ore grinding effects in different time periods are judged, and other parameters are adjusted to stabilize production.

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.

The invention discloses a gastrodia elata planting method with coco coir as a matrix. The gastrodia elata planting method aims at solving the problems that in traditional soil planting, the weight is large, hardening is prone to occurring, moisture preservation and air permeability are poor, and efficiency is low. The method comprises the following steps: selecting commercial coco coir of which the particle size is 0.05-5mm, the coarse particle size is less than or equal to 30% and the fine particle size is more than or equal to 40%, and pre-treating for more than or equal to 2 hours by steam sterilization at The method comprises the following steps: planting according to the proportion of 0.3 cubic meter of coconut coir, 80 jin of fungus materials or artificial fungus sticks for replacing the fungus materials and 1 jin of hemp seeds per square meter, and controlling the initial moisture content to be 50-60% and the growth period to be 40-45%. Experiments show that the water-holding capacity of the coco coir is 350-380%, the air permeability porosity is 29-33.2%, the yield per mu reaches 1600-2800kg in 2023-2024, compared with soil planting, the yield is obviously increased, the rotten hemp rate is reduced to 3-7%, and the labor efficiency is improved by about 50%.

The invention relates to the technical field of mineral resource mining and mineral separation, and discloses a barite ore open-pit mining harmless mineral separation novel process which comprises the following steps: S1, adopting an open-pit mining mode, stripping surface coverings, and collecting barite raw ore; s2, raw ore primary washing and separation, specifically, the collected raw ore is washed with water, barite rough ore and primary tailings are separated out, and the primary tailings comprise ore washing muddy water and slag; s3, the ore washing muddy water generated in S2 is separated into coarse particle materials and fine muddy water in a physical separation mode, the coarse particle materials and the fine muddy water are 50 meshes or above, according to the novel barite ore open-pit mining harmless beneficiation technology, through all-component separation and resource utilization of tailings, a traditional tailing treatment mode is thoroughly changed, the ore washing muddy water generated by primary washing of raw ore is recycled, and the ore washing muddy water generated by secondary washing of the raw ore is recycled. Through physical separation, reselection and solid-liquid separation processes, fine sand products, soil backfill materials and process reuse water can be obtained through conversion, and no slurry waste residues exist.

The application relates to the technical field of aluminum hydroxide, in particular to a preparation method of coarse-grained aluminum hydroxide; the preparation method comprises the following steps: continuously decomposing sodium aluminate solution through carbonation to obtain coarse-grained aluminum hydroxide slurry; drying the coarse-grained aluminum hydroxide slurry, and then performing multi-stage continuous screening and multi-stage air separation to obtain high-quality coarse-grained aluminum hydroxide products; the continuous decomposition through carbonation comprises continuously decomposing in a gradient-decreasing manner of aluminum oxide concentration; the particle size of the coarse-grained aluminum hydroxide products meets the requirements of D10>=145 mu m, D50>=220 mu m and D90>=300 mu m; the existing sodium aluminate decomposition stage is introduced with continuous carbonation decomposition, the continuous decomposition process is controlled in a gradient-decreasing manner of aluminum oxide concentration, and then the particle size of the dried aluminum hydroxide is accurately graded through multi-stage continuous screening and multi-stage air separation, so that the high-quality coarse-grained aluminum hydroxide products with concentrated particle size distribution are obtained.