335 results about "Wet grinding" patented technology

The invention discloses a high-hardness tungsten carbide-cobalt hard alloy and a preparation method thereof. A production raw material formula comprises the following components in parts by mass: 100 parts of tungsten carbide powder, 6-20 parts of cobalt powder, 0.2-1.3 parts of a composite sintering aid, 0.5-4 parts of a wet grinding medium and 0.2-4 parts of a forming agent, the composite sintering aid is composed of rare earth oxide and cobalt phosphide according to the mass ratio of (1-5): 1. The method has the advantages that on the premise that the toughness of the tungsten carbide-cobalt hard alloy is slightly improved, the hardness and wear resistance of the alloy are remarkably improved, and the industrial problems that the hardness improvement of the tungsten carbide-cobalt hard alloy with a single sintering aid is limited and the toughness of the alloy is lost are solved.

The invention belongs to the technical field of laser cladding, and particularly relates to a TiC-Fe-Cr coating powder material for an automobile brake disc and a preparation method and application of the TiC-Fe-Cr coating powder material. The coating powder material is prepared from 60%-80% of TiC powder, 15%-30% of Fe powder, 4%-11% of Cr powder and 0.8%-2.2% of polyethylene glycol through mixing, wet grinding, spray drying, compression molding, sintering crushing and spherical densification treatment, and the coating powder material is attached to the surface of the brake disc in a laser cladding mode. By utilizing the arrangement, the invention provides a coating powder material which solves the problem of lack of a special laser cladding material for an aluminum alloy brake disc and overcomes the technical bottlenecks that a traditional grey cast iron brake disc is heavy in weight, quick in abrasion, capable of generating dust and easy to rust and an aluminum alloy brake disc is low in hardness and poor in abrasion resistance.

The invention discloses a three-dimensional wet grinding machine and method based on metal powder machining, and relates to the technical field of wet grinding machines, the three-dimensional wet grinding machine comprises a rack, a wet grinding tank is arranged at the top of the rack, two material ports are formed in the outer side of the wet grinding tank, the two connecting frames are both fixedly connected to the outer side of the wet grinding tank, and the two material ports are arranged in the wet grinding tank. The two connecting frames are rotationally connected with the rack, and a transmission device used for driving the connecting frames to rotate is arranged in the rack. After wet grinding is completed, powder slurry is discharged, then the traction piece drives the driving mechanism to ascend, a medium is forced to continuously penetrate through the driving mechanism, abraded grinding balls in the medium are discharged in batches through the screening piece, the abraded grinding balls in the wet grinding tank can be automatically screened out, and it is avoided that a large number of grinding balls need to be discharged; and after discharging, screening treatment is carried out, and the discharged materials are supplemented.

The invention discloses an efficient pollution-free treatment method for municipal waste incineration fly ash, and relates to the technical field of waste resource utilization and environmental protection. Comprising the following steps: S1, adding the garbage fly ash into a hydrochloric acid solution, carrying out wet grinding, and carrying out centrifugal separation to obtain heavy metal filtrate and heavy metal-removed fly ash; washing the heavy metal-removed fly ash with clear water to obtain a washing solution; mixing the washing liquid with the heavy metal filtrate to obtain a heavy metal solution; s2, adding a complexing agent into the heavy metal solution, stirring and mixing, standing overnight, performing centrifugal separation to obtain a heavy metal removal solution and a heavy metal complex, and adjusting the pH value of the heavy metal removal solution to be neutral to complete heavy metal removal treatment; s3, uniformly mixing the washed heavy metal-removed fly ash and a catalyst, performing low-temperature pyrolysis treatment, sieving and separating to obtain dioxin-removed fly ash, and completing dioxin removal treatment; and S4, the heavy metal removal solution and the heavy metal complex are treated, and garbage fly ash treatment is completed.

The invention discloses a method for preparing an underground cemented high-water-expansion filling material from negative carbon all-solid waste and application, the method comprises the following steps: raw material pretreatment: mixing magnesium slag, steel slag and a dispersion medium to prepare solid waste slurry, adding an inducer into the solid waste slurry, and carrying out wet ball milling treatment to obtain first slurry; wet grinding and carbonization: under the condition of continuously introducing CO2, carrying out wet ball-milling treatment on the first slurry to obtain second slurry; thickening and expansion regulation and control: adding a thickening agent and an expansion regulation and control agent into the second slurry, then carrying out wet ball milling treatment to obtain third slurry, mixing and molding, mixing the third slurry with a dispersion medium, gypsum and copper tailings, and carrying out vibration molding to obtain the underground cementing high-water-expansion filling material. The method takes industrial solid waste as a raw material, has double benefits of carbon sequestration and resource utilization, and is suitable for projects such as mine goaf filling and the like.

The invention discloses a preparation method of high-purity lithium sulfide based on a carbon reduction method, and belongs to the technical field of material preparation. Comprising the following steps: S1, mixing anhydrous lithium sulfate with a reducing agent, and adding absolute ethyl alcohol as a solvent, S2, drying a material subjected to wet grinding, removing the absolute ethyl alcohol solvent and water, and transferring the material into a tubular furnace or an atmosphere sintering furnace to obtain a dried material; s3, the environment temperature in the furnace is increased to 600-800 DEG C at the heating rate of 5-12 DEG C / min, heat preservation is conducted for 30-60 min, and a reduction reaction is conducted; s4, after a reduction reaction product is cooled to the room temperature, adding absolute ethyl alcohol, stirring until the absolute ethyl alcohol is fully dissolved, completing solid-liquid separation through a suction filtration device, collecting filtrate and distilling; and S5, drying the distilled product to obtain the high-purity lithium sulfide. By accurately controlling the raw material purity, the reaction parameters and the purification process, the product purity is greater than or equal to 99.5%, the yield is greater than or equal to 89%, and the high-performance application requirements of solid-state batteries and the like are completely met; the method is simple in process steps, moderate in equipment requirements and suitable for large-scale industrial production.

The invention discloses a method for preparing YAG transparent ceramic by two-step sintering, which comprises the following steps: 1) weighing yttrium oxide powder and aluminum oxide powder according to a stoichiometric ratio, mixing, and carrying out solid-phase reaction to synthesize YAG powder; 2) performing dry grinding and wet grinding on the obtained YAG powder to obtain mixed slurry; 3) drying the obtained mixed slurry to obtain powder, and performing compression molding and cold isostatic pressing to obtain a ceramic biscuit; and 4) pre-sintering the obtained ceramic biscuit in an oxygen-containing atmosphere, embedding the pre-sintered ceramic with oxide particles, and carrying out hot isostatic pressing sintering to prepare the YAG transparent ceramic. On the basis of obtaining the YAG transparent ceramic with high optical quality, a microstructure with a fine grain size can be obtained, and good mechanical properties are considered; the preparation method is simple, the equipment cost and energy consumption are low, the traditional annealing step can be omitted, and a new thought can be provided for preparation of the high-performance YAG transparent ceramic.

The invention relates to the technical field of hard alloys, and particularly discloses a ruthenium boride reinforced ultra-ultra coarse grain WC-Co hard alloy and a preparation method thereof in order to solve the problems of low strength and hardness and poor toughness of an ultra-ultra coarse grain alloy product caused by difficult control of grain size in an existing ultra-ultra coarse grain alloy preparation process. The ultra-coarse grain WC-Co hard alloy comprises the following raw materials: 0.5-5% of ruthenium-boron mixed powder, 5-10% of cobalt powder and the balance of tungsten carbide particles. Wherein the number ratio of ruthenium atoms to boron atoms in the ruthenium-boron mixed powder is 1: (0.5-1.5), and the carbon adjusting range of the total mass of tungsten and carbon in the tungsten carbide particles is 6.08-6.20 wt%. The problems that WC particles are excessively crushed and Co phases are non-uniformly distributed are solved by utilizing high-energy stirring dry mixing without adding a grinding body and combining a flexible wet grinding process with extremely short time and extremely low ball-to-material ratio, and Ru powder and B powder are introduced and combined with a special sintering process, so that the effects of high toughness, high hardness, high heat conductivity and the like of the ultra-coarse grain alloy are achieved.

The invention discloses a superfine grinding and cooling process for producing a kaolin raw material. The superfine grinding and cooling process comprises the following steps: (1) pulping; (2) front-section wet grinding; (3) cooling: pumping the slurry A in the step (2) into a cooling tower for cooling through a slurry pump at the flow rate of 30-70m < 3 > / h to obtain slurry B with the temperature of 30-45 DEG C and the mass concentration of 35-45%; and (4) carrying out rear-section wet grinding. The superfine grinding and cooling process for producing the kaolin raw material has the beneficial effects that the particle collision requirement of superfine grinding is met, the consumption of a dispersing agent is reduced due to low temperature, the total consumption of the dispersing agent is finally reduced, the use cost of the raw material is further reduced, the service life of rear-section wet grinding equipment is prolonged, the maintenance cost is reduced, and the service life of the kaolin raw material is prolonged. And the granularity D92 of the slurry is less than 2 microns, less impurities are introduced, and the qualified rate of the product is more than 95%.

The utility model provides a dual-purpose semi-automatic tool sharpener which comprises a frame, an abrasive belt grinding mechanism, a millstone grinding mechanism and a water tank are installed on the frame, a driving shaft and a tensioning shaft are arranged on the frame in parallel, a grinding abrasive belt is wound on the driving shaft and the tensioning shaft, one side of the driving shaft extends outwards and is provided with a driven chain wheel, and the other side of the driving shaft is provided with a driven chain wheel. A motor is installed on the frame, a driving chain wheel is installed on an output shaft of the motor, the driving chain wheel and a driven chain wheel are in transmission through a chain, the millstone polishing mechanism is installed on the side face of the frame, a sliding groove is fixedly formed in the position, on one side of the chain wheel, of the frame, and a sliding block is installed in the sliding groove and protrudes out of a strip-shaped hole to form a protruding shaft. An eccentric shaft is arranged on the outer side face of the driven chain wheel, and a driving rod is installed between the eccentric shaft and the protruding shaft. According to the dual-purpose semi-automatic tool sharpener, an abrasive belt grinding system and a grinding stone grinding system are integrated, the water tank is arranged in the dual-purpose semi-automatic tool sharpener to achieve wet grinding, the tool sharpening efficiency is remarkably improved, and a blade is protected.

The present application belongs to the technical field of aluminate binder production, and particularly relates to a preparation method of aluminate binder. Main raw materials of aluminum hydroxide, calcium chloride, calcium oxide and aluminum oxide are used, accurate and fine batching is carried out according to the corresponding chemical composition of the mineral phase composition, and wet grinding is carried out by using a ceramic grinding process, so that the super-micro powder raw material with extremely high fineness and extremely high homogenization degree can be obtained. After the powder is subjected to pressure filtration separation, the powder is subjected to drying treatment, and then the automatic forming equipment is used to press the raw material blank into the tunnel kiln for calcination. After the calcined blank is crushed and ground, the aluminate binder is finally prepared.

The invention belongs to the technical field of industrial solid waste recycling and filling materials, and particularly discloses a method for improving pozzolanic activity of water-quenched copper slag through synergistic modification of magnetic separation iron removal, which comprises the following steps: adding CaO into molten copper slag discharged in a copper smelting process, uniformly mixing, reacting in an oxygen-containing atmosphere, and then carrying out water quenching and quenching to obtain the pozzolanic activity of the water-quenched copper slag. Modified copper slag particles are obtained; the modified copper slag particles are subjected to wet grinding and drying, and modified copper slag powder is obtained; and the modified copper slag powder is subjected to magnetic separation, and magnetic iron ore concentrate and non-magnetic tailings are obtained. The prepared non-magnetic tailings replace part of cement to prepare the auxiliary cementing material with high pozzolanic activity. Through the synergistic effect of CaO modification and a magnetic separation iron removal process, the pozzolanic activity of the water-quenched copper slag is remarkably improved. The method is simple and convenient in process, the high value-added application way of the water-quenched copper slag is effectively widened, the resource utilization rate is increased, and the method has important significance on promoting comprehensive utilization of solid waste and environmental protection.

The invention discloses a magnetic separation, enrichment and recovery process for low-grade vanadium titano-magnetite, which belongs to the technical field of comprehensive utilization of vanadium titano-magnetite, adopts a combined mineral separation process of dry pre-enrichment and tailing discarding, wet grinding, concentration and refinement, combination of gravity and magnetism and middling retreatment, selects mature industrial equipment and optimizes the combination. High-efficiency dry pre-selection equipment, wet grinding equipment, a multi-section reselection and middling retreatment system and solid-liquid separation equipment are utilized, a large amount of tailings are discarded at the front end of a mine, iron and titanium are efficiently separated and comprehensively recycled in the middle main process, the recycling rate bottleneck is broken through through the middling retreatment technology, near-zero discharge of wastewater is achieved, and compared with a conventional process, water can be saved by 50-60%, and the economic benefit is high. According to the method, the grinding and separation cost is saved by 60-70%, the energy-saving effect is remarkable, the purposes of cost reduction, efficiency improvement, comprehensive utilization of resources and clean production are achieved, the production and technical problems of low-grade vanadium titano-magnetite mine enterprises in arid and water-deficient areas are effectively solved, and the method is suitable for large-scale production and application.

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 invention discloses a low-cost preparation method of an ardealite-ferronickel slag high-early-strength low-carbon cementing material. The method comprises the following steps: respectively carrying out wet grinding treatment on a mixture of ferronickel slag, ardealite and quick lime for 5-6 hours at the rotating speed of 400 rpm, and adding 1.5-2% of a water reducing agent, so as to obtain mixed ardealite slurry with median particle sizes D50 of 3.5-4.5 microns and D50 of 2-3 microns; and mixing and stirring 50% of nickel-iron slag slurry, 40% of phosphogypsum and quicklime co-wet-ground mixed slurry and 10% of ordinary Portland cement in a stirrer to obtain the high-early-strength and high-dosage phosphogypsum-nickel-iron slag-based cementing material. The ardealite-ferronickel slag high-early-strength low-carbon cementing material is prepared, a new building material is provided for the building material market, and a new way is found for solid waste resource utilization of ardealite and ferronickel slag.

The invention relates to the technical field of deep processing of natural products, in particular to water-soluble turmeric with low hygroscopicity and high stability and a preparation method and application thereof. The preparation method comprises the following steps: mixing and cross-linking a curcumin-ethanol solution and a chitosan-acetic acid solution, and drying to obtain curcumin-chitosan compound nanoparticles; and adding the nano-particles into a wall material solution containing starch sodium octenylsuccinate, maltodextrin, high-branched-chain cyclodextrine and hydroxypropyl starch, emulsifying, homogenizing at high pressure, performing wet grinding and drying to obtain the water-soluble turmeric with low hygroscopicity and high stability. The prepared product is good in water solubility, high in turmeric content, good in stability, not prone to moisture absorption and caking in the high-temperature and high-humidity environment and good in fluidity, solves the problems of moisture absorption, caking and the like of water-soluble powder turmeric products after being transported for a long time in the high-temperature and high-humidity environment, and is suitable for the fields of food, medicine, cosmetics and the like.

This invention discloses an additive with chloride-fixing and toughening functions, its preparation method, and its application. The additive uses tricalcium aluminate and sodium acrylate as main raw materials. Under alkaline conditions, a wet grinding process hydrates tricalcium aluminate to form a calcium-aluminum layered bimetallic hydroxide structure, allowing acrylate atoms to intercalate into the interlayer, forming a stable organic-inorganic composite structure. When applied to cement-based materials, the layered structure reacts with chloride ions to generate chloride-containing hydration products, achieving chloride ion solidification. Simultaneously, the organic components in the composite structure undergo polymerization under the action of an initiator, forming a polymer network in the cement matrix, thereby improving the material's toughness. When added to cement-based materials at 1-5% of the cementitious material mass, the 28-day flexural strength can be increased by 38%-113%, and the 28-day chloride ion solidification rate can be increased by 17%-23%, while maintaining good workability. This invention achieves the simultaneous introduction of chloride ion solidification and material toughening functions through a single additive, simplifying the material system. It is suitable for cement-based materials containing endogenous chloride ions and has good engineering application prospects.

The utility model relates to the field of precision automatic lathe, and discloses a guide sleeve for precision automatic lathe, which comprises a lower conductor, the top end of the outer wall of the lower conductor is fixedly connected with a connecting port, the top end of the outer wall of the connecting port is fixedly connected with a connecting sleeve, and the surfaces of the connecting sleeve and the connecting port are provided with open slots. A plurality of groups of annular grooves are formed in the inner side walls of the connecting port and the connecting sleeve, straight grooves are formed in the inner side walls of the connecting port and the connecting sleeve, and a high-temperature wet grinding stabilizing layer is fixedly connected to the top end of the outer wall of the medium-range antifriction anti-sticking layer. According to the utility model, a lubricant storage and flow system formed by the connecting port and the annular groove and the straight groove on the connecting sleeve can automatically seep and continuously supplement the lubricant according to the movement of the bar, so that the good lubrication state between the bar and the guide sleeve is always kept, the friction coefficient is effectively reduced, the abrasion and the energy loss are reduced, and the service life of the guide sleeve is prolonged. And the processing efficiency is improved.

The application belongs to the technical field of hard alloy and particularly relates to a preparation method for improving impact toughness of hard alloy and the hard alloy, and comprises the following steps: S1, obtaining tungsten powder, spherical cobalt powder and tantalum-niobium solid solution, and obtaining tungsten carbide blocks by high-temperature carbonization of the tungsten powder; S2, obtaining tungsten carbide powder by airflow crushing and airflow grading of the tungsten carbide blocks; S3, obtaining first slurry by first wet grinding of the spherical cobalt powder, adding the tungsten carbide powder and the tantalum-niobium solid solution into the first slurry to obtain second slurry by second wet grinding; and S4, obtaining the hard alloy by drying, pressing and sintering of the second slurry; the application adopts the high-temperature carbonization process, promotes complete development of the tungsten carbide, adopts the airflow crushing and airflow grading to effectively improve the uniformity of the tungsten carbide powder, adopts the spherical cobalt powder and pre-mixes and disperses the cobalt powder first to promote uniform distribution of the cobalt phase in the hard alloy sintering process, and thus effectively improves the impact resistance of the low-cobalt hard alloy.

The invention relates to the technical field of lithium ion positive electrode materials and preparation thereof, and discloses a ferromanganese phosphate precursor and a method for preparing a lithium ion battery positive electrode material from the ferromanganese phosphate precursor, a lithium ion battery positive electrode is prepared from the ferromanganese phosphate precursor, and the precursor, a lithium source, a phosphorus source and a carbon source are subjected to wet grinding to obtain uniform slurry; performing spray drying to obtain precursor microspheres; sintering at high temperature in an inert atmosphere to obtain a lithium manganese iron phosphate positive electrode material; and finally preparing the positive pole piece of the lithium ion battery. According to the method, the precursor is taken as a core, the problems of non-uniform distribution of iron and manganese elements and poor batch stability in a traditional process are solved, and the prepared positive electrode material has the advantages of high specific discharge capacity, good rate capability and long cycle life, and is suitable for large-scale production.

The invention relates to the technical field of ceramic materials, in particular to temperature-stable low-loss low-dielectric tetragonal lithium-based microwave dielectric ceramic and a preparation method thereof, the chemical formula of the microwave dielectric ceramic is LiScO2, and the preparation raw materials are Li2CO3 and Sc2O3. The preparation method comprises the following steps: weighing Li2CO3 powder and Sc2O3 powder according to a certain proportion, mixing, sequentially carrying out wet grinding and drying, pre-sintering for 4-8 hours in an air atmosphere at the temperature of 700 DEG C to obtain pre-sintered powder, carrying out secondary ball milling and drying on the pre-sintered powder, adding a binder, granulating, carrying out compression molding, and finally sintering for 4-8 hours in an air atmosphere at the temperature of 875-925 DEG C, so as to obtain the Li2CO3 / Sc2O3 composite material. The tetragonal lithium-based microwave dielectric ceramic can be obtained. The LiScO2 microwave dielectric ceramic prepared at the sintering temperature of 900 DEG C has a near-zero temperature coefficient of resonance frequency (-3.4 ppm / DEG C), can ensure the thermal stability of devices, and is widely used for manufacturing various dielectric antenna substrates, resonators, filters and other microwave devices.

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 belongs to the technical field of solid waste treatment, and provides a resourceful treatment method for solid waste of an electrolytic aluminum factory. According to the method, sodium hypochlorite is added in the wet grinding process, so that cyanide in the solid waste of the electrolytic aluminum factory is oxidized into CO2 and N2, environmental pollution and safety risks caused by the solid waste of the electrolytic aluminum factory are thoroughly eliminated, and harmlessness is achieved. The fluorine source is used as the leaching agent, so that the molecular ratio of the cryolite can be adjusted, and the quality of the regenerated cryolite is improved; hydrochloric acid is used as a leaching agent, so that strict requirements on sulfur content of recycled electrolyte in an electrolytic aluminum factory are met. And meanwhile, no waste gas is generated by the resourceful treatment method. According to the resourceful treatment method, energy consumption is low, no acid mist is released in the operation process, the lithium yield is high, the lithium content in the solid waste of the electrolytic aluminum factory can be reduced to 0.025% from 0.4-2%, cryolite and carbon powder are obtained after filter residues obtained after lithium extraction through leaching are rinsed, separated and dried, and comprehensive resourceful utilization is achieved.

This invention discloses a method for preparing high-purity, highly dispersed nano-silicon nitride powder. The method involves ball milling raw materials including silicon dioxide powder, fatty acids, and a wet grinding agent, followed by a hydrothermal reaction with a carbon source to obtain a precursor powder. The precursor powder is then subjected to reduction nitridation and decarbonization to obtain the final product. The mass ratio of silicon dioxide powder, fatty acids, and the wet grinding agent is 100:0.1–1:10–50. The carbon source comprises 50–80% of the silicon dioxide powder mass by weight of carbon. This method, through fatty acid modification of silicon dioxide, not only effectively avoids particle agglomeration but also alters the interfacial tension of silicon dioxide. During the hydrothermal process, the fatty acid layer coating the silicon dioxide surface acts as a carbonization active site, uniformly carbonizing with the carbon source on the silicon dioxide surface. This effectively solves the problem of uneven mixing of silicon dioxide and carbon, improves the purity of the silicon nitride product, and significantly reduces the content of impurities such as oxygen and carbon in the product.

The invention discloses a pecan vegetable protein beverage and a preparation method thereof, and belongs to the technical field of food processing. The preparation method of the pecan vegetable protein beverage comprises the following steps: performing physical peeling through a freeze-thaw method, performing low-temperature wet grinding to obtain a pecan oil body emulsion system with a complete structure, reinforcing an oil body interface through the thermal denaturation characteristic of soybean protein isolate, and finally constructing a stable network structure by using dendrobium officinale stem liquid to increase the viscosity of the system, so as to obtain the pecan vegetable protein beverage. The pecan protein beverage free of the artificially synthesized food stabilizer is prepared through the preparation method of the pecan protein beverage, and the pecan protein beverage is rich in natural flavor, high in system stability, free of floating oil and sediment after being stored for 6 months, and very good in storage stability.

The application relates to a recycling method of aluminum hydroxide coarse powder, and belongs to the technical field of aluminum hydroxide powder preparation. The method comprises the following steps: obtaining a sodium aluminate solution; adding aluminum hydroxide seeds into the sodium aluminate solution to perform first precipitation decomposition, so as to obtain a decomposition slurry; performing grading treatment on the decomposition slurry to obtain aluminum hydroxide coarse powder; mixing the aluminum hydroxide coarse powder with water according to a set solid content, and then performing wet grinding treatment, so that the particle size of the aluminum hydroxide coarse powder is reduced, and a wet grinding slurry is obtained; and mixing the wet grinding slurry with the decomposition slurry to perform second precipitation decomposition, so as to obtain fine powder aluminum hydroxide. The method converts the originally unusable aluminum hydroxide coarse powder into high-activity secondary seeds, realizes the closed loop circulation of "coarse powder -> wet grinding -> secondary seeds", directly uses the byproduct to replace the preparation process of the sodium aluminate solution in the traditional resolvent process, and reduces the production cost of the fine powder.

The invention discloses a method for preparing oxidized pellets by grinding hematite powder for sintering in the technical field of ferrous metallurgy. The method comprises the following steps: (1) mixing hematite powder for sintering with an additive, and carrying out wet ball milling pretreatment to obtain hematite ore pulp; the additive comprises limestone and calcium humate; (2) the hematite ore pulp is subjected to filter pressing dehydration, and a fine hematite filter cake is obtained; (3) the fine hematite filter cake, magnetite fine powder, a binder and water are mixed for pelletizing, and green pellets are obtained; and (4) drying, preheating, roasting, soaking and cooling the green pellets in sequence to obtain finished oxidized pellets. Limestone and calcium humate are added in the wet grinding process, ore pulp dehydration is remarkably improved, a low-water-content uniform filter cake is obtained, follow-up pelletizing and roasting performance is considered, and a foundation is laid for stable preparation of high-quality oxidized pellets.

The invention discloses a preparation method of a starch-based bacteriostatic microcapsule, which is characterized in that octenyl succinic acid modified starch is used as a wall material, sorbic acid is used as a core material, and the starch-based bacteriostatic microcapsule with high loading capacity and high embedding rate is prepared by combining rod pin type wet ball milling and spray drying embedding. The sorbic acid is subjected to wet grinding by adopting rod pin type ball milling, the sorbic acid is fully ground in a suspension environment, the particle size is reduced, composite embedding of starch and an active agent in the grinding process is provided, the microcapsule is prepared through spray drying treatment subsequently, the loading capacity of the microcapsule exceeds 10%, the embedding rate is higher than 90%, and the preparation method is simple and easy to operate. A new thought is explored in the field of starch-based microcapsule embedding, and meanwhile microcapsule products are effectively put into the manufacturing process of baked products.

The application provides a preparation method of a lithium iron phosphate material, and the method comprises the following steps: mixing first iron phosphate, lithium carbonate, a first carbon source and deionized water in a certain proportion to obtain a first mixed solution, stirring and dispersing, first wet grinding, spray drying, first sintering and first crushing to obtain a lithium iron phosphate intermediate; mixing the lithium iron phosphate intermediate, second iron phosphate, lithium carbonate, a second carbon source, a dopant and deionized water in a certain proportion to obtain a second mixed solution, stirring and dispersing, second wet grinding, spray drying, second sintering, second crushing to obtain the lithium iron phosphate material; wherein the average particle size of the lithium iron phosphate intermediate is larger than that of the lithium iron phosphate material. The process flow is simple, and the material has high compactness. The application further provides the lithium iron phosphate material and a lithium ion battery.

The invention discloses a method for preparing yellow phosphorus from refractory siliceous phosphorite, and solves the technical problem of how to improve the suitability of refractory siliceous phosphorite powder. Comprising the following steps: a) adding a pretreatment adhesive into refractory siliceous ground phosphate rock, then carrying out wet grinding pretreatment to obtain wet fine powder, and then carrying out first heating treatment on the wet fine powder to obtain dried pretreated mineral powder; b) mixing the pretreated mineral powder with a forming adhesive and water to obtain a mixed material, and then carrying out compression molding on the mixed material to obtain phosphate rock green pellets; c) carrying out second heating treatment on the green phosphorite pellets to obtain dried and solidified phosphorite pellets; d) the phosphorite pellets, a carbonaceous reducing agent and a siliceous flux are mixed and then fed into an electric furnace to be smelted, and furnace gas containing yellow phosphorus steam is generated; e) dedusting and purifying the furnace gas, and condensing the dedusted and purified furnace gas so as to recover yellow phosphorus and produce tail gas rich in carbon monoxide; wherein the pretreatment of the adhesive and the wet grinding pretreatment are cooperated.