321 results about "Magnesite" patented technology

The invention relates to the field of furnace lining materials, in particular to a rapid repairing material for a tapping hole and a furnace lining of an intermediate frequency furnace. The rapid repairing material comprises the following components in parts by weight: 50-70 parts of tabular corundum, 10-20 parts of fused magnesite, 8-15 parts of alumina micro powder, 3-8 parts of nano zirconia, 5-12 parts of silicon carbide, 10-15 parts of silica sol and 2-5 parts of a reinforcing agent. Wherein the reinforcing agent is titanium calcium aluminate coated with chromium nickel boride. The tabular corundum is mainly used as an integral framework; the fused magnesite is matched with the alumina micro powder to form magnesium aluminate spinel with a high melting point; the nano zirconium oxide can fill pores and is excellent in toughness; the silicon carbide has the advantages of high hardness, high thermal conductivity and high melting point; the reinforcing agent is titanium calcium aluminate coated with chromium nickel boride, although the adding amount is small, the high-temperature strength, toughness and thermal shock resistance of the repairing material can be remarkably improved, and especially the long-term corrosion resistance can be remarkably improved.

The invention relates to the field of refractory materials, in particular to a dry ramming mass for an intermediate frequency furnace and a preparation method thereof.The dry ramming mass is prepared from, by weight, 45-55 parts of fused corundum, 8-12 parts of fused magnesia, 15-20 parts of tabular corundum, 3-5 parts of fused spinel, 3-4 parts of activated aluminum oxide, 1-2 parts of silicon carbide, 1-2 parts of silica sol and 0.5-1 part of boric acid. 3.5-4.5 parts of a binding agent and 3-5 parts of an anti-penetrating agent; wherein the anti-penetrating agent is chromium oxide coated nickel aluminate microspheres. The invention solves the two major problems of easy penetration and thermal shock peeling of the traditional furnace lining, is especially suitable for harsh smelting environments of high manganese steel, stainless steel and the like, and has long service life and convenience in construction.

The invention discloses a sulfur iron oxide composite denitrification filler, a preparation method and application, and relates to the technical field of sewage treatment, the sulfur iron oxide composite denitrification filler comprises sulfur powder, siderite, magnesite, magnesium oxide, metal manganese, metal aluminum, nano iron, boric sludge, magnetite and a binder; wherein the sum of the addition amounts of the metal manganese, the metal aluminum and the nano iron accounts for 8-16% of the mass of the sulfur-iron oxide composite denitrification filler. The technical problems that in the prior art, strength and abrasion resistance are insufficient, and denitrification efficiency is low are solved.

The invention relates to the technical field of refractory materials, in particular to an antioxidant and application thereof in steel ladle slag line bricks, and the antioxidant comprises a Si / SiC multiphase material, modified nano Al2O3 and CaF2; the ladle slag line brick comprises an antioxidant, fused magnesite, crystalline flake graphite and phenolic resin. Si-SiC compound waste is subjected to magnetic separation and acid pickling, then a SiO2 passivation layer is formed through pre-oxidation, moisture and air in the storage period are isolated, and a titanate coupling agent is introduced to improve the wettability and compatibility with phenolic resin. P2O5 released by phosphate on the surface of the modified nano Al2O3 at a high temperature reacts with alkali (earth) metal migrated to a SiO2 oxide layer to prevent the alkali (earth) metal from forming a low-melting-point eutectic substance, CaF2 reacts with SiO2 along with temperature rise, a passivation layer is broken, internal Si and SiC are directly exposed, and boron oxide of the modified nano Al2O3 remarkably reduces activation energy and a temperature threshold value of the reaction of CaF2 and SiO2.

The invention belongs to the technical field of coatings, and particularly relates to an aerogel modified reflective insulation MPC coating and a preparation method thereof. The aerogel modified reflective thermal insulation MPC coating provided by the invention is prepared from the following raw materials in parts by weight: 60 to 74 parts of magnesia, 45 to 55 parts of phosphate, 6 to 8 parts of retarder, 31 to 92 parts of thermal insulation filler, 1 to 3 parts of functional additive, 1 to 5 parts of aerogel and 48 to 84 parts of water. The aerogel modified reflective heat insulation MPC coating has excellent reflective heat insulation performance, and also has good constructability and durability.

The invention relates to the technical field of refractory materials, in particular to a method for producing magnesia carbon bricks from low-carbon reduced magnesia. The method comprises the following steps: respectively weighing 80-90 parts by weight of magnesia, 3-5 parts by weight of a function enhancer, 1-3 parts by weight of aluminum powder, 0.3-1 part by weight of aluminum nitride, 2-3 parts by weight of carbon black, 3-5 parts by weight of crystalline flake graphite and 3-5 parts by weight of phenolic resin for later use; mixing the magnesite except the fine magnesite with phenolic resin, uniformly mixing, adding the rest raw materials, uniformly stirring at a low speed, adding the fine magnesite, and uniformly stirring at a high speed to obtain mixed slurry; and injecting the mixed slurry into a prepared mold, and sequentially carrying out compression molding and heat treatment to obtain the magnesia carbon brick. The magnesia carbon brick produced by the invention not only has excellent mechanical properties, but also has excellent thermal shock resistance stability and oxidation resistance; the quality of the produced magnesia carbon brick is effectively guaranteed, and meanwhile the service life of the magnesia carbon brick is prolonged to a certain degree.

The invention provides a refractory ceramic-based material for a smelting furnace lining and a preparation method of the refractory ceramic-based material, and belongs to the technical field of ceramic refractory materials. The material comprises coated modified fused magnesite main aggregate, ceramic sand main aggregate, surface coated magnesium oxide fine powder, gamma-phase aluminum oxide micro powder, an aluminum dihydrogen phosphate solution, alkaline silica sol, a pre-reaction spinel precursor and zirconium boride micro powder. The coated modified fused magnesite main aggregate is prepared by mixing and sintering fused magnesite, silicon carbide composite powder, chromium sesquioxide powder and phenolic resin powder. And mixing the silicon carbide powder and the magnesium oxide powder, and depositing a silicon nitride layer on the particle surface to prepare the silicon carbide composite powder. The surface-coated magnesium oxide fine powder is formed by coating the surfaces of magnesium oxide fine powder particles with aluminum oxide. The pre-reaction spinel precursor is prepared by the following steps: preparing a mixed salt solution from magnesium nitrate hexahydrate and aluminum nitrate nonahydrate by using deionized water, reacting, aging and carrying out heat treatment. And the ceramic sand main aggregate is made of zirconium oxide. And all the layers are matched for use to realize balanced improvement of performance.

The invention discloses a steel ladle slag line magnesia carbon brick masonry positioning device, and particularly relates to the technical field of steel ladle slag line masonry, the steel ladle slag line magnesia carbon brick masonry positioning device comprises a supporting ring located above a steel ladle, a positioning masonry assembly is arranged at the bottom of the supporting ring, and the positioning masonry assembly comprises a first gear ring arranged at the bottom of the supporting ring; and the bottom of the first gear ring is fixedly connected with a reinforcing ring. A first motor drives a gear ring to transmit and drives a reinforcing ring to rotate, all hinge blocks drive a masonry pressing plate to deflect synchronously in the same direction by means of sliding fit of an inclined guide groove and a sliding column, the masonry pressing plate forms circumferential synchronous pressurization on a brick ring through an abutting arc plate, it is ensured that the brick ring bears uniform pressure in the whole circumferential direction, and the construction efficiency is improved. The problem that local pressure is not uniform in manual masonry is solved, a core foundation is laid for forming a stable self-locking structure for the brick ring, meanwhile, mechanization of pressurization operation is achieved, manual pressurization is replaced, and the labor intensity of foundation pressurization is greatly reduced.

The utility model relates to the technical field of magnesite flotation, in particular to a magnesite flotation tailing defoaming device, which is characterized in that a feed port and a discharge port are respectively arranged at the upper end and the lower end of a defoaming tank in a penetrating manner; the top end of the rotating rod is rotationally connected into the defoaming tank through a bearing, the motor is fixedly arranged on the top surface of the defoaming tank, the output end of the motor is connected with the end part of the rotating rod, the motor is connected with an external power supply, and defoaming paddles are fixedly arranged at the bottom end of the rotating rod; a plurality of drainage blades are fixedly arranged on the rotating rod at equal angles and are positioned above the defoaming paddles; the drainage tube is arranged on the rotating rod in a sleeving mode through a plurality of supporting rods, and the drainage blades are located in the drainage tube. The drainage assembly is arranged at the bottom end of the drainage pipe, and the defoaming paddle is located in the drainage assembly; according to the defoaming device, foam liquid is drained to the defoaming blades through the matching effect of the drainage blades and the drainage pipes, and foam can be effectively broken through special design in cooperation with the shapes and the materials of the blades, so that the defoaming efficiency is improved.

The invention discloses a multi-component magnesium refractory aggregate using copper slag flotation tailings as raw materials and a preparation method thereof, the multi-component magnesium refractory aggregate is obtained by using copper slag flotation tailings powder, light-burned MgO powder, magnesite powder and alpha-Al2O3 powder as raw materials through compression molding and calcination. The preparation method comprises the following steps: mixing the copper slag flotation tailing powder, the light-burned MgO powder, the magnesite powder and the alpha-Al2O3 powder in a mixer to obtain mixed powder; adding a binding agent solution into the mixed powder, and performing mechanical pressing to obtain a green body; and heating the formed green body to 950-1150 DEG C, preserving heat for 4-6 hours, finally heating to 1480-1580 DEG C, preserving heat for 4-6 hours, cooling, crushing, and screening to obtain the multi-component magnesium refractory aggregate. According to the method, the copper slag flotation tailing powder is used as the raw material, resource utilization of the copper slag flotation tailings is achieved, and the obtained multi-component magnesium refractory aggregate is suitable for a cement rotary kiln.

The invention discloses a method for improving hydrogen-based reduction-electric furnace melt separation efficiency of vanadium titano-magnetite, which comprises the following steps: (1) mixing the vanadium titano-magnetite with slaked lime, magnesite, bentonite and water to obtain a mixture, and pelletizing to obtain green pellets; the addition amount of the slaked lime and the magnesite is controlled to enable the binary alkalinity of the mixture to be 0.4-0.6 and the quaternary alkalinity to be 0.6-0.8; (2) the green pellets are dried and roasted, and oxidizing pellets are prepared; (3) the oxidizing pellets are subjected to hydrogen group reduction, and DRI containing vanadium and titanium is obtained; and (4) adding the DRI into an electric furnace, and then adding carbon for melt separation to obtain vanadium-containing molten iron and titanium-containing slag. According to the method, calcium and magnesium are added into the pellets, the ore phase structure of the vanadium-titanium ore pellets is changed, the reducibility of the vanadium-titanium magnetite pellets is improved, the vanadium-titanium DRI metallization ratio is increased, additional flux does not need to be added in the DRI melt separation process, the vanadium-titanium yield is larger than 92%, and the method has good application prospects.

The invention discloses a modified phenolic resin combined steel ladle brick and a preparation method thereof, and relates to the technical field of tundish refractory materials, the steel ladle brick comprises the following raw materials: 90-93 wt% of main aggregate, the main aggregate comprises fused magnesite, tabular corundum and recycled corundum, and the main aggregate comprises magnesium oxide, magnesium oxide and aluminum oxide; wherein the content of the fused magnesite is 75-85%, the content of the tabular corundum is 1-6%, the content of the recycled corundum is 5-9%, the content of the crystalline flake graphite is 8-10%, the content of the composite binding agent is 3-5%, the composite binding agent is composed of 80% of modified phenolic resin liquid and 20% of common phenolic resin, the antioxidant is 1-2%, the auxiliary binding agent is 1%, and the auxiliary binding agent is calcium lignosulphonate. By adopting the modified phenolic resin, adding the crystalline flake graphite, introducing the recycled corundum and mixing step by step, the oxidation resistance, the thermal shock stability, the erosion resistance and the high-temperature stability of the ladle brick are improved, the cost is reduced, and the service life is prolonged.

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 kind of mixed mineral materials and methods for promoting long-term storage of sediment organic carbon, the material is composed of a certain proportion of serpentine and magnesite, steps are: 1) select mineral material serpentine and magnesite as raw material;2) serpentine and magnesite are pretreated;3) the serpentine and magnesite after pretreatment are mixed according to certain proportion;4) the mixed mineral material is spread to sediment surface with certain thickness;5) through the reaction of mixed mineral material and sediment organic carbon to generate stable magnesium carbonate mineral, realize long-term storage of sediment organic carbon in situ.The mineral material in the application has the characteristics of environmental friendly, reasonable formula, convenient to use, ecological environmental protection and the like.The application realizes long-term storage of sediment organic carbon in situ by the reaction of mixed mineral material and organic carbon, provides new ideas for water ecological restoration engineering to help carbon neutralization and realize sediment in situ carbon storage.

The utility model relates to the technical field of calcining furnaces, in particular to a microwave heating high-temperature circulating flash calcining furnace, which comprises a cylindrical furnace body, a strong wave-transparent layer arranged on the inner wall of the cylindrical furnace body, a fire-resistant furnace lining arranged on the inner wall of the strong wave-transparent layer, a microwave generator arranged on the periphery of the cylindrical furnace body, and a preheater connected with the upper end of the cylindrical furnace body, a dust removal assembly is arranged above the preheater, and a discharging machine is arranged at the lower end of the cylindrical furnace body and connected with a cooling machine. According to the utility model, the microwave generator is used for calcining magnesite, dolomite, limestone, kaolin, clay, illite and the like, can be used for calcining in a reduction furnace or a vacuum reduction furnace, and is also suitable for high-temperature and ultrahigh-temperature flash sintering high-grade refractory materials; the device has the advantages of low investment cost, small occupied area, high resource utilization rate and the like.

A high-toughness magnesium-calcium binder mortar material from multi-component high-salinity solid waste and a preparation method thereof are provided. Raw materials of the high-toughness magnesium-calcium binder mortar material from multi-component high-salinity solid waste include a dry powder mortar material, a shrinkage reducing agent, a water reducing agent and fibers, where an addition amount of the fibers is 1.0-2.0% of a mass of the dry powder mortar material; where in parts by weight, the dry powder mortar material includes: 28-40 parts of aging mixture, 10-15 parts of industrial solid waste gypsum, 5-8 parts of light burned magnesium oxide, 2-5 parts of high alumina cement, 3-8 parts of rubber powder and 30-40 parts of artificial fine sand; and where in parts by weight, the aging mixture includes 50-70 parts of municipal solid waste incineration (MSWI) fly ash and 30-50 parts of magnesite, as well as aluminum dihydrogen phosphate solution and phosphogypsum leachate.

The utility model discloses a conical magnesite calcination dust fall device which comprises a working box, second motors are fixedly installed on the two sides of the bottom of an inner cavity of the working box, threaded rods are fixedly installed at the output ends of the second motors, and threaded sleeves are installed on the front surfaces of the threaded rods in a threaded mode. Connecting plates are fixedly mounted at the ends, close to each other, of the threaded sleeves, damping springs are fixedly mounted at the tops of the connecting plates, and supporting plates are fixedly mounted at the tops of the damping springs. Through the arrangement of a second motor, the effect of rotating a threaded rod is achieved, through the arrangement of the threaded rod, the effect of adjusting the height of a threaded sleeve through a sliding rail and a sliding rod is achieved, through the arrangement of the threaded sleeve, the effect of adjusting the height of a connecting plate is achieved, and through the arrangement of the connecting plate, the height of the connecting plate is adjusted. And the supporting plate can be driven to adjust the height, and the connecting rod can be driven to adjust the height through the supporting plate.

This invention provides a self-trophic denitrification filter media with anti-scaling function and its preparation method. The filter media uses sulfur, magnesite, and a microporous carrier as its main components, supplemented with soluble salts for continuous pore formation, forming a highly efficient self-trophic denitrification filter media with anti-scaling function. This filter media overcomes the problem of scale formation and reduced efficiency when treating high-concentration nitrate wastewater, which is often caused by conventional methods using calcium carbonate as a neutralizing agent. It also overcomes the problems of slow reaction rates and poor filter media activity caused by the inability of filter media prepared using magnesite or siderite to neutralize the generated acid in a timely manner.

The application relates to the technical field of functional materials, in particular to a vinyl-modified magnesium-based flame retardant as well as a preparation method and application thereof, which comprises the following steps: adding water-magnesite into an ethanol solution to stir into a slurry, adding a modification aid, heating to 50-80 DEG C, constant-temperature stirring for 10-20 min, then filtering, drying, and obtaining the vinyl-modified magnesium-based flame retardant; the mass ratio of the water-magnesite to the modification aid is 1:(0.001-0.005). The vinyl-modified magnesium-based flame retardant does not contain halogen, has high-efficiency flame retardation, has good compatibility with high-molecular materials, and can improve the mechanical properties of high-molecular polymer materials when used.

The utility model relates to a magnesite calcining system, which comprises a feeding device, a vertical preheater, a rotary kiln, a cylindrical cooler, a dust remover and a fan, the discharge end of the feeding device is positioned above the inlet of the vertical preheater, the outlet of the vertical preheater is connected with the rotary kiln, a burner is arranged at the kiln head of the rotary kiln, and the cylindrical cooler is connected with the rotary kiln. An outlet of the rotary kiln is connected with an inlet of the cylindrical cooler, an inlet of the dust remover is communicated with a smoke port of the vertical preheater, an outlet of the dust remover is connected with an inlet of the fan, and an outlet of the fan is connected with the chimney. According to the utility model, the vertical preheater is adopted, the pressure loss is low, and the air distribution is uniform, so that the preheating efficiency is high, the power consumption of the system is low, the decomposition rate of preheated magnesite raw materials entering a kiln is high, the small-particle-size magnesite raw materials of 10-50mm can be calcined, proper pressure and stroke of the hydraulic push rod can be determined according to different feeding particle sizes of the magnesite raw materials, the material pushing balance is ensured, and the energy consumption is low. The resource utilization rate is improved; and a cylindrical cooler is selected, so that the cooling effect is better.

A method for desilication of magnesite flotation by using a collector SAA belongs to the technical field of magnesite beneficiation and purification process, and steps are as follows: high-silicon low-grade magnesite is crushed, and ball-milled to obtain magnesite powder; at room temperature, the magnesite powder is placed in a flotation device, and deionized water is added to carry out slurry preparation; then, HCl solution is added to adjust the pH value, and stirring is carried out to obtain magnesite slurry; the collector SAA is added to the magnesite slurry, and stirring is uniformly carried out, and then one-roughing one-cleaning one-scavenging reverse flotation purification is carried out to obtain low-silicon magnesite concentrate. The application of a new collector SAA is developed, because the collector SAA has strong selective collecting property for silicon-containing minerals, the desilication process is shortened and simplified, the flotation process operation is more stable, the operation is more simple, and the collector SAA has more environmental protection compared with other chemical collectors. The ore treated by the method has low grade, and the content of SiO2 in the crude ore is high; the obtained magnesite concentrate can reach the special-grade standard of metallurgical industry.

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.

The invention discloses an ultralow-carbon unfired magnesia carbon brick for a stainless steel AOD converter. The ultralow-carbon unfired magnesia carbon brick comprises the following raw materials in parts by weight: 95-98 parts of dicalcium fused magnesite, 1-3 parts of graphite, 1-3 parts of resin, 1-3 parts of a metal additive, 3-5 parts of an antioxidant, 1-2 parts of titanium, 1-2 parts of chromium and 1-2 parts of zirconium. Wherein the antioxidant is a mixture of modified nano vanadium pentoxide and rare earth oxide. The invention aims to solve the technical problem of poor oxidation resistance of magnesia carbon bricks.

The invention discloses an LF refining furnace plastic refractory and a production method thereof, and relates to the technical field of plastic manufacturing. The LF refining furnace plastic refractory is prepared from the following components in parts by weight: 60-75 parts of seawater magnesia particles, 5-8 parts of seawater magnesia ultrafine powder, 5-8 parts of an aluminum sulfate solution, 4-8 parts of acetylated castor oil, 5-8 parts of east mud, 1-3 parts of spodumene, 2.5-3.5 parts of ammonium magnesium phosphate whiskers, 1-2 parts of liquid raw molasses, 2-4 parts of silica fume, 1-2 parts of amino phenolic resin powder, 1-1.5 parts of sodium hexametaphosphate and 0.5-1 part of British glue. According to the plastic refractory for the LF refining furnace, the seawater magnesia particles with specific particle size distribution serve as aggregate, close packing and basic fire resistance of the material are ensured, the seawater magnesia ultrafine powder and the ammonium magnesium phosphate whiskers are matched, the high-temperature breaking strength and toughness of the material are improved, and the final product has excellent plasticity.

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 invention relates to the technical field of thermal insulation materials, and provides a glass wool thermal insulation material and a preparation process thereof, the glass wool thermal insulation material comprises the following raw materials: glass fibers and an adhesive; the glass fiber is prepared from, by mass, 100 parts of waste glass, 6-8 parts of borax, 4-6 parts of quartz sand, 3-4 parts of limestone, 4-6 parts of kaolin, 4-6 parts of flint clay and 1-2 parts of aluminum oxide whiskers. The ratio of the total mass of the quartz sand, the kaolin and the flint clay to the mass of the aluminum oxide whiskers is (7.25-15.5): 1. According to the technical scheme, the problem of low glass fiber strength in a glass wool thermal insulation material in related technologies is solved.

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 invention relates to the technical field of fused magnesite raw materials, in particular to fused magnesite raw material automatic crushing, screening and impurity sorting integrated equipment which comprises a crushing mechanism, a discharging mechanism is fixedly connected to the top of the crushing mechanism, a screening mechanism is fixedly connected to the top of the discharging mechanism, and the discharging mechanism comprises a bottom plate. The device comprises a bottom plate, a connecting table is fixedly connected to the rear side of the top of the bottom plate, side plates are fixedly connected to the left side and the right side of the top of the connecting table, L-shaped connecting plates are fixedly connected to the tops of the two side plates, and a collecting frame is fixedly connected to the front side of the top of the bottom plate. According to the invention, the automatic crushing and screening and impurity sorting process of the fused magnesia raw material is realized, the working efficiency is improved, the purity of the raw material is ensured, and through the elaborately designed crushing mechanism, blanking mechanism and screening mechanism, the fused magnesia raw material can be accurately controlled and treated.

The invention relates to the field of refractory materials, and discloses a gunning mix for an RH insert tube, a composition of the gunning mix and a preparation method of the gunning mix. Wherein the dry material comprises the following components in percentage by mass: 30-40% of a waste magnesite brick reclaimed material with the particle size of 0-3mm and the MgO content of 82-87%, 30-40% of sintered magnesia with the particle size of 0-3mm, 20-25% of medium-grade magnesia with the particle size of less than 0.088 mm, 1-5% of silica fume and 2-6% of a binding agent; the mass of the water is 15-21% of the mass of the dry material. The bonding performance and the slag resistance of the gunning material can be improved.

The utility model discloses a punch forming mechanism for magnesite cupel processing, which comprises a workbench provided with a plurality of corresponding forming holes; the piston rod end of the downward pressing oil cylinder is fixedly connected with a plurality of forming downward pressing pieces downwards; the forming fixing pieces are movably installed in the forming holes respectively, the bottoms of the forming fixing pieces are fixedly connected to the corresponding upward pushing oil cylinders through spiral springs, and ultrasonic transducers arranged in the corresponding spiral springs in a sleeved mode are fixedly connected to the bottoms of the forming fixing pieces respectively; the set of fixing lug plates are fixedly connected to the portions, on the two sides of the forming fixing piece, of the bottom of the workbench, the bottom side of the workbench is fixedly connected with a horizontal driving air cylinder, and the piston rod end of the horizontal driving air cylinder is fixedly connected with a fixing shaft which is connected into an inserting hole of the fixing lug plates and a positioning hole of the forming fixing piece in a penetrating and penetrating mode. According to the utility model, the blanking uniformity and accuracy of materials in the plurality of forming holes can be effectively ensured, so that the quality of products is effectively ensured.