45 results about "Magnesite" patented technology

The application discloses a multi-channel shaft kiln for calcining magnesite, wherein a distributing vehicle and a discharging device are located at the top and bottom of a kiln body. The kiln body is provided with a preheating section, a calcining section and a roasting section from top to bottom, and square strip-shaped channels are arranged in the kiln. A combustion chamber is arranged in the furnace wall on both sides of the calcining section with a width of 40-80 cm, the combustion chamber is built by hollow integral combustion bricks, the combustion chamber is communicated with the calcining section by cross-distributed through holes, the through hole outlet is downwardly inclined, and an inclined convex block is arranged at the top. The lower part of the roasting section is provided with an upper collecting opening and a lower expanding opening structure, an air pressure pipe is arranged in the inclined brick of the upper collecting opening, the opening of the air pressure pipe is downwardly inclined and communicated with the roasting section, and the lower expanding opening is matched with the upper semicircular surface of the discharging device. The middle part of the upwardly inclined distributing main pipe of the distributing vehicle is communicated with the branch pipe which is inclined and changed in direction, and a change valve is arranged in the main branch pipe. The application provides a comprehensive solution of the shaft kiln with high calcining quality, energy saving, low investment and long service life for calcining magnesite, and can also be used for high-quality calcining of small-particle materials.

The application discloses a tundish slag line dry material, and relates to the technical field of tundish refractory materials. The mass percentage of each raw material component in the tundish slag line dry material is as follows: 26-30% of 3-1mm fused magnesite, 22-28% of 1-0mm fused magnesite, 20-27% of 200-mesh fused magnesite, 1.5-2% of trisodium phosphate hexahydrate, 2-2.5% of sodium metasilicate nonahydrate, 1-1.5% of adipic acid, 4-5% of calcium carbonate, 0.3-0.5% of vermiculite, and the rest of 5-3mm fused magnesite. The application adopts a new composite binder system, solves the environmental protection problem of a traditional phenolic resin binder, and significantly improves the medium-temperature and high-temperature strength, corrosion resistance, thermal shock resistance and heat insulation performance of the magnesia dry material through the synergistic effect among the components, so that the overall optimization of the material performance is realized.

This invention belongs to the field of refractory brick production technology, specifically a method for preparing electrofused magnesia-chrome bricks. Addressing the problems of high sintering temperatures leading to brick cracking and high energy consumption in existing technologies, the following solution is proposed, including the following steps: High-purity magnesia, electrofused magnesia with a large crystalline structure, electrofused magnesia-chrome sand, ultrafine powder, and rare earth sintering agent are added to a mixing mill for mixing; molding is then performed by feeding the mixed raw materials into a friction brick machine for molding; the molded brick blanks are then dried at a temperature set between 110-200℃ for 48 hours. This invention lowers the firing temperature of magnesia-chrome bricks by adding rare earth sintering agent and using ultrafine powder, achieving better firing results at a lower firing temperature and reducing energy consumption; by adding a certain amount of rare earth sintering agent, a certain amount of uniform micropores are generated during firing, improving the thermal shock resistance of the magnesia-chrome bricks.

The utility model relates to the technical field of mixing mill, concretely relates to a mixing mill for magnesium -carbon brick processing, including support frame, still including the mixing mill mechanism for mixing and grinding material, mixing mill mechanism is located above support frame, and is equipped with the mixing structure for mixing to material first crushing again between the main shaft and mixing bucket inner wall. Advantageous effects: through the mutual cooperation of mixing structure and mixing mill mechanism two's material realizes the multiple effects of rolling, circumferential shearing, radial rubbing, increases the area of material mixing and grinding, increases the crushing and rubbing force between materials, makes the mixing between multiple materials more uniform, thereby reduces the time of mixing and grinding, improves the quality and the efficiency of material mixing and grinding.

The application belongs to the technical field of brick embryo production and processing, and particularly relates to a production process of fused recoupling magnesite-chrome brick with excellent thermal shock stability. In view of the problem that batch firing cannot realize continuous production and cannot guarantee the drying quality of the brick embryo when the brick embryo is dried at present, the following scheme is proposed, which comprises a conveying assembly. The conveying assembly comprises a conveying machine box and a top machine box. An arrayed feeding assembly is further arranged on the top of the conveying machine box. A drying assembly is further arranged in the conveying machine box. A control module is further arranged on the side wall of the conveying machine box. The control module comprises a processor. The application realizes continuous drying of the brick embryo, replaces the traditional batch processing, greatly improves the production efficiency, accurately controls the drying degree through real-time weight and crack detection combined with dynamic gas adjustment, effectively avoids the problems of incomplete drying or excessive carbonization, significantly improves the drying qualified rate of the brick embryo, adjusts the gas consumption on demand, reduces energy waste, and reduces the production energy consumption.

The application discloses fine-grained steel SAW fluorine alkali type sintered flux and application, including barium fluoride 28-33%, aluminum ash powder 10-12%, dolomite 5-7%, pre-melted slag powder 25-27%, fluorocarbon cerium ore 2-3%, titanium boron iron 1.5-2.5%, kaolin 6-8%, magnesite 4-6%, silicon calcium aluminum powder 10-13% by weight percentage. The application can meet the submerged arc welding requirement of 65kg grade structural steel in most cases, has good welding process and mechanical properties of post-welding deposited metal, is widely applied in the construction, machinery and other industries, and greatly improves the production and life efficiency of people.

This invention belongs to the field of electrofused rebonded magnesia-chrome brick production technology, specifically a salt impregnation and drying process for electrofused rebonded magnesia-chrome bricks. The proposed solution includes the following steps: Step 1: Place the sintered brick blank with residual heat into the workstation, seal the workstation, and then perform vacuum treatment; Step 2: Inject a preheated salt solution into the vacuum-pretreated workstation, establish a directional circulating flow field for dynamic pressure impregnation, and simultaneously perform ultrasonic monitoring and fluid dynamic slip ring monitoring. Based on the fused data, process status assessment information is generated. This invention highly integrates vacuum pretreatment, dynamic pressure impregnation, intelligent drying, and controllable cooling into a single intelligent workstation, improving the filling efficiency for large and complex pores. Furthermore, by combining internal and external monitoring methods, it ensures the superiority and stability of the product, achieving simultaneous improvement in product quality, production efficiency, and energy efficiency.

The application discloses a kind of high thermal shock resistance magnesium carbon brick, which is made of the following raw materials by weight percentage: fused magnesite aggregate 60-75%, fused magnesite fine powder 10-20%, flake graphite 8-12%, thermosetting phenolic resin binder 3-4%, vitamin C 0.3-0.8%, and zirconium diboride 2.2-4.9%. The preparation process of the magnesium carbon brick disclosed in the application includes: dissolving VC in part of the phenolic resin to form an acid-based pretreatment solution; using the strategy of dry mixing aggregate with ZrB2 to make ZrB2 preferentially adhere to the surrounding of aggregate particles; then using a two-step wet mixing and material packing process of adding the VC pretreatment solution first and then adding the remaining resin, the functions of vitamin C and zirconium diboride are coordinated in resisting thermal shock, which fundamentally inhibits the structural spalling of the magnesium carbon brick in the ladle.

The utility model belongs to solid waste resource utilization technical field especially relates to a kind of production system for preparing high-purity magnesium sulfate with solid waste magnesite slurry, it is characterized in that, including solid waste pretreatment unit, reaction kettle, separation unit, drying unit and circulation unit, solid waste pretreatment unit includes crusher and bunker, reaction kettle is lined with enamel, with frequency conversion stirrer and temperature controller, reaction kettle is connected with high-position sulfuric acid tank outlet, high-position sulfuric acid tank is connected with sulfuric acid batching tank by pipeline, sulfuric acid pump, separation unit includes first stage electric centrifuge and second stage electric centrifuge, two-stage electric centrifuge between magnesium sulfate tank and crystallization tank are equipped, circulation unit includes PE mother liquor tank and mother liquor pump, final product is magnesium sulfate heptahydrate or anhydrous magnesium sulfate with water content≤0.5%.The utility model has the advantages that:low-activity solid waste magnesite slurry is converted into >99% purity magnesium sulfate, realizes solid waste high-value utilization conversion, and "zero" wastewater discharge is achieved in whole process.

The utility model discloses a kind of pre-pressurization feeding devices of ball press, belong to ball press technical field, including ball press box, pre-pressing mechanism is arranged on the ball press box, ball press mechanism is arranged on the ball press box, the top of the ball press box is fixed with feeding cylinder sleeve interface has.The utility model in the process of ball pressing to fused magnesite, put fused magnesite in the inner cavity of storage hopper, using first motor drives stirring rod, spiral feed rod and broken knife rotation, through broken knife to the fused magnesite in the inner cavity of storage hopper is broken, simultaneously using the rotation of spiral feed rod the fused magnesite in the inner cavity of storage hopper is conveyed from the inner cavity of feeding cylinder downward, so that fused magnesite is input between two pre-pressing rollers from feeding side pipe, realizes the function of fused magnesite feeding, additionally preliminary pressurization forming to fused magnesite in the process of pushing, prepare for subsequent ball pressing operation.

This invention relates to a method for synergistic calcium reduction and quality improvement of magnesite. The method first establishes the intrinsic relationship between each ore particle and the grade of various chemical components, including MgO, based on the differences in surface texture, luster, roughness, and color of the various minerals in the raw magnesite ore. Standard samples of magnesite concentrate, tailings, and intermediate products are then selected, thereby establishing an artificial intelligence (AI) pre-selection model. The AI ​​pre-selection model is used to intelligently pre-select and remove tailings from coarse-grained magnesite. The intermediate products obtained from the intelligent pre-selection undergo reverse flotation for desilication, forward flotation for calcium reduction, and magnetic separation for iron reduction to obtain magnesite concentrate and tailings. This method leverages the synergistic effect of intelligent pre-selection and traditional flotation for calcium reduction, overcoming the limitations of flotation for calcium reduction and significantly reducing the calcium content of the magnesite concentrate product. This method has the advantages of simple operation, low production cost, and high efficiency.

The application provides a composite flocculant suitable for alkali reduction wastewater treatment and a preparation method thereof, and relates to the technical field of wastewater treatment; the method comprises the following steps: mixing magnesite tailings and sintered red mud according to a mass ratio of 1:3 and grinding to 200 meshes, and performing ladder calcination under the protection of nitrogen to obtain a magnesite-red mud mixture; a sodium silicate solution is adjusted to a pH of 3.5 by sulfuric acid, and after stirring to form a sol, titanium tetrachloride is added to perform temperature curing to obtain a prepolymer; hydrochloric acid is added to the magnesite-red mud mixture to perform reaction, and then calcium aluminate powder, the prepolymer and konjac glucomannan phosphate are added in sequence to perform stirring reaction; calcium hydroxide suspension liquid is added to adjust the alkalinity of the system to 75-80%, and after static curing, the composite flocculant is obtained; through the multi-metal cooperation of aluminum, iron, magnesium, titanium and calcium, a four-dimensional flocculation mechanism of "electric neutralization-precipitation-net capture-bridging" is realized, and the problem of easy gelation instability of traditional polysilicate aluminum salt is solved.

The present application relates to the technical field of waste magnesite-carbon brick, and particularly relates to a waste magnesite-carbon brick regeneration process based on hydration technology, which comprises the following steps: crushing waste magnesite-carbon brick, carrying out hydration treatment, drying and screening to obtain recycled aggregate, mixing the recycled aggregate with fused magnesite, modified flaky graphite, metal aluminum powder and thermosetting phenolic resin, shaping and solidifying to obtain recycled magnesite-carbon brick. The present application solves the problem that the strong hydrophobicity and dense layered structure of large flaky graphite form a closed effect on water penetration and gas escape, so that CH4 gas generated by hydration of Al4C3 after secondary waste cannot be effectively released, thereby causing explosion.

This invention discloses a flotation reagent combination and method for simultaneous desilication and decalcification of magnesite. The reagent combination consists of a pH adjuster and magnesium inhibitor synergistic component, a calcium carbonate selective collector, a silicate collector and carrier component, and a frother in a specific mass ratio. These components synergistically achieve the separation effect of "suppressing magnesium, floating calcium, and carrying silicon." The flotation method employs a one-step process involving grinding and pulp conditioning, alkaline environment creation and magnesium suppression, synergistic impurity collection, and flotation separation. This process simultaneously removes silicate and calcium carbonate impurities from magnesite in a single flotation operation. This invention features a simplified process, high separation efficiency, low reagent cost, magnesite recovery exceeding 92%, excellent silicon and calcium removal rates, stable product quality, and environmental friendliness, making it highly valuable for industrial applications.

The present application relates to a kind of control method and sintering system of stable sintered ore magnesium oxide content, it is related to sintering production process technical field, it solves the problem that the existing sintered ore magnesium oxide content fluctuation is big, influence sintering quality, including the main source of magnesium oxide in sintered ore and its contribution ratio are analyzed, identify that born lime powder, steel slag fine powder in mixed ore and magnesite powder are as the key raw material of influence magnesium oxide content fluctuation;Upper limit standard of magnesium oxide content is set to the purchase of born lime powder;Magnesium oxide content lower limit and granularity standard are set to the purchase of magnesite powder;Steel slag fine powder is screened, control its granularity, and screened steel slag fine powder is involved in mixed uniform pile;Magnesite powder is screened, remove large block impurities therein;Batching process control and pre-adjustment;Equipment guarantee;With the qualified rate of magnesium oxide content is significantly improved, fluctuation range is stably in target interval, realize the effect of accurate, stable control to sintered ore magnesium oxide content.

The present application relates to the technical field of chemical production, and particularly relates to a magnesium oxide preparation method, comprising the following steps: step S1: obtaining a suspension slurry by calcining and digesting magnesite; step S2: obtaining a carbonized liquid by carbonizing the suspension slurry; step S3: mixing the carbonized liquid with alkali to perform a magnesium precipitation reaction, and obtaining magnesium carbonate precipitation and a magnesium precipitation liquid; and step S4: obtaining a magnesium oxide product by drying and calcining the magnesium carbonate precipitation. Compared with the prior art, the present application does not need high-temperature pyrolysis when precipitating magnesium, and can effectively reduce energy consumption and production cost.

This invention provides a CMA environmentally friendly de-icing agent prepared from magnesite tailings and waste acetic acid, along with its preparation method and application. Belonging to the field of industrial solid waste treatment and utilization technology, it includes the following raw materials in parts by weight: 50-60 parts magnesite tailings, 40-80 parts waste acetic acid, 5-10 parts glacial acetic acid, 20-50 parts calcium oxide, and 1-5 parts magnesium oxide. By co-utilizing two industrial wastes—difficult-to-treat magnesite tailings and industrial waste acetic acid—a high-performance, low-corrosion CMA de-icing agent is prepared without deep purification. This achieves low-cost resource utilization of industrial waste and produces a competitive, environmentally friendly de-icing agent product, simultaneously solving multiple industrial and environmental problems such as solid waste accumulation, waste acid disposal, and the high cost and pollution of de-icing agents.

The utility model discloses a long service life's high strength low carbon micropore magnesite carbon brick relates to low carbon micropore magnesite carbon brick technical field, including no. The no. The metal - ceramic composite coating is closely attached to the outer surface of base body, and the fiber braided net reinforced shell is closely coated outside the metal - ceramic composite coating, and the gradient gap buffer layer is closely coated outside the fiber braided net reinforced shell. The utility model discloses a base body is coated with metal - ceramic composite coating, fiber braided net reinforced shell and gradient gap buffer layer in proper order outside, and multilayer collaborative promotion magnesite carbon brick strength and life, and the coating metal - ceramic composite coating resists high temperature and is anti -erosion, and the fiber braided net reinforced shell increases mechanical property, and the gradient gap buffer layer adapts thermal expansion, and the internal stress is prevented from cracking.

The application relates to a preparation method of a magnesium-carbon refractory material with added titanium boride for enhancing resistance to acid high-titanium slag corrosion, and belongs to the field of refractory materials. The magnesium-carbon refractory material is prepared by taking magnesite and flake graphite as main raw materials and directly introducing titanium boride powder as a functional additive phase. The introduced titanium boride can effectively improve the matrix structure and interface state of the magnesium-carbon refractory material, improve the penetration resistance and chemical corrosion resistance of the material under the action of acid high-titanium slag, and also consider the oxidation resistance and high-temperature service stability of the material. After the magnesium-carbon refractory material is added, the microstructure and interface state of the material can be effectively improved, the penetration and chemical corrosion of the acid high-titanium slag on the material are slowed down; meanwhile, the titanium boride and the magnesium-carbon system synergistically act, which is helpful to improve the structural compactness, slag corrosion resistance and high-temperature service stability of the material, so that the obtained magnesium-carbon refractory material is more suitable for acid high-titanium slag working conditions such as a vanadium and titanium extraction smelting separation furnace, the process flow is simple, and the preparation cost is low.

This invention discloses a method for low-temperature roasting of magnesia from hydromagnesia, the resulting magnesium oxide, and its applications. The method includes: mixing a solution containing magnesia-chlorite with magnesia, drying and crushing the magnesia, followed by a one-step calcination to obtain magnesium oxide. The method provided by this invention ensures complete decomposition of magnesia while lowering the decomposition temperature, resulting in the production of magnesium oxide with higher activity and purity. It also effectively reduces energy consumption and CO2 emissions during the production process. Furthermore, the magnesium oxychloride cementitious material prepared using the aforementioned magnesium oxide exhibits superior mechanical properties.

The present application relates to a kind of refractory binders, especially a kind of preparation method and application of silica aerogel modified phenolic resin binder for magnesite-carbon brick.The preparation method of the silica aerogel modified phenolic resin binder for magnesite-carbon brick, by hydrophobic silica aerogel pretreatment, premix liquid preparation, in-situ modification composite, low-temperature pre-curing and other steps, nanometer hydrophobic silica aerogel is uniformly dispersed in thermosetting phenolic resin, interface compatibility is improved by silane coupling agent, and modified phenolic resin binder for magnesite-carbon brick is prepared.The present application solves the technical problems of poor high-temperature oxidation resistance, loose residual carbon structure and weak interfacial bonding force of traditional phenolic resin.The prepared binder is used for the preparation of magnesite-carbon brick for metallurgical electric furnace, converter, ladle and other furnace linings, which can improve the high-temperature strength, thermal shock resistance and oxidation resistance of the material;The preparation process is simple, the conditions are mild, can be adapted to existing production line, has broad market prospect and application value.

The utility model discloses a kind of plastic forming devices for magnesite-carbon brick processing, it is related to the field of magnesite-carbon brick processing, including mounting base, mounting base top is fixedly installed with guide rail, hoisting platform is erected in guide rail upper portion, installation frame is slidably installed in guide rail middle portion, plastic forming frame is embedded in installation frame interior, closed component is movably arranged in guide rail one side interior, multiple hydraulic cylinders are hoisted in hoisting platform bottom, lifting plate is fixedly installed in hydraulic cylinder bottom, plastic forming press plate is screw-mounted in lifting plate bottom, suction pump is fixedly installed in lifting plate top, discharge component is equipped in guide rail middle portion both sides;The utility model is a kind of plastic forming devices for magnesite-carbon brick processing with double-station alternate operation and suction exhaust function, can realize continuous efficient production.

This invention discloses a method for calcining magnesite using a solid heat carrier. The method employs magnesia as a specific solid heat carrier, and the process includes: magnesia pretreatment and heating, magnesite pretreatment, drying and preheating, calcination, separation of the solid heat carrier from the product, and waste heat recovery. The pretreated and heated magnesia is brought into full contact with the pretreated and preheated magnesite in the calcination reactor for heating. After calcination, the magnesia is separated from the product and recycled for further heating. Simultaneously, the waste heat from the recovered carbon dioxide and magnesium oxide is used to preheat the drying of the magnesite. This application proposes using a solid heat carrier for magnesite calcination, utilizing the homogeneity of magnesia and magnesium oxide to prevent the introduction of impurities, overcoming the limitations of conventional gaseous heat carriers with stringent airflow requirements, adapting to various types of reactors, and achieving a clean and efficient process through waste heat recovery.

This invention discloses a functional magnesite composite material and its preparation method, belonging to the field of building materials technology. This invention introduces specific functional groups onto the surface of magnesite powder through chemical modification, significantly improving the material's adsorption performance and stability. The method is simple, with mild reaction conditions, and the resulting composite material possesses high specific surface area, abundant active sites, and excellent chemical stability, making it widely applicable in wastewater treatment. Compared to magnesite composite materials, the composite material prepared by this invention has adjustable functions, low cost, and is easy to scale up, exhibiting significant technical and economic advantages.

The application discloses a low-leakage-current magnesium-aluminum composite electric heating insulating material and a preparation method thereof. The material is composed of aluminum oxide and magnesium oxide in a mass ratio of 3:7, and a magnesium-aluminum composite structure in an aluminum-rich state is formed through high-temperature melting. The leakage current of the material in a range of 300 DEG C to 700 DEG C is significantly lower than that of pure magnesium oxide material, and the breakdown voltage at 600 DEG C reaches 1500 V or above. The application obtains magnesium oxide through calcination of magnesite and spherical aluminum oxide through bauxite, and through mixing, high-temperature melting, natural cooling and post-processing processes, the thermal stability, insulating performance and breakdown resistance of the material are effectively improved without adding additional solid leakage-current-reducing agents.

The utility model relates to dust removal device technical field discloses a removable electric smelting magnesite stripping dust removal device, including a plurality of transportation support frame, dust removal box, two pusher, dust extraction device, workstation and electric box, electric box electricity is connected pusher and dust extraction device, and transportation support frame and dust removal box all slide connection workstation top surface, and the fixed end of pusher connects workstation top surface, and the pusher end of pusher is connected to the side wall of dust removal box, and dust extraction device is communicated with the inner chamber of dust removal box through pipeline, and dust removal box includes first box and second box, and one end surface of first box is in abutment with one end surface of second box, and the pusher end of one pusher is connected to the other end surface of first box, and the pusher end of one pusher is connected to the other end surface of second box. The utility model communicates with the inner chamber of dust removal box through pipeline, can inhale and handle the dust generated in the stripping process in time, effectively improves the working environment, and protects the health of operator.

This invention discloses a positioning device for magnesia-carbon brick masonry in ladle slag lines, specifically relating to the field of ladle slag line masonry technology. It includes a support ring located above the ladle, with a positioning and masonry assembly at the bottom of the support ring. The positioning and masonry assembly includes a first gear ring located at the bottom of the support ring, with a reinforcing ring fixedly connected to the bottom of the first gear ring. This invention uses a first motor to drive the gear ring, causing the reinforcing ring to rotate. Utilizing the sliding engagement of the inclined guide groove and the sliding column, all hinged blocks drive the masonry pressure plate to rotate synchronously and in the same direction. This allows the masonry pressure plate to apply synchronous circumferential pressure to the brick ring through the pressure arc plate, ensuring uniform pressure throughout the entire circumference of the brick ring. This solves the problem of uneven local pressure in manual masonry, laying a core foundation for a stable self-locking structure of the brick ring. Simultaneously, it mechanizes the pressure application operation, replacing manual pressure application and significantly reducing the labor intensity of foundation pressure application.

The application discloses a preparation process of special magnesium oxide and relates to the technical field of special magnesium oxide preparation, and comprises the following steps: crushing magnesite, processing the magnesite into a plurality of ore blocks, screening the ore blocks with high magnesium content for further crushing, setting the initial rotating speed of a converter, starting the converter and preheating, pouring the ore blocks into the converter, continuously heating the converter, when the temperature and heating time of the converter reach the requirements, stopping the heating and closing the converter, cooling the converter to the ambient temperature, completing the first-time burning of the magnesium oxide, resetting the rotating speed of the converter, starting the converter and heating, when the temperature and heating time of the converter reach the requirements, stopping the heating and closing the converter, cooling the converter to the ambient temperature, taking out the special magnesium oxide after repeated burning, mixing and bagging, and completing the preparation of the special magnesium oxide. The repeated calcination method is adopted, the prepared magnesium oxide has high catalytic performance, and thus the combustion performance of double-base propellant is improved.