1486 results about "Refractory" patented technology

The invention provides titanium-containing anhydrous stemming for a blast furnace and a preparation method of the titanium-containing anhydrous stemming, and belongs to the technical field of refractory materials for the blast furnace. The titanium-containing anhydrous stemming for the blast furnace comprises the following raw materials: 40-60 parts of titanium corundum, 5-15 parts of silicon carbide, 10-20 parts of ferro-silicon nitride fine powder, 5-15 parts of titanium dioxide fine powder, 5-15 parts of vanadium-titanium slag fine powder, 5-10 parts of coke fine powder, 1-5 parts of monatomic silicon fine powder, 1-5 parts of ball clay micro powder, 1-5 parts of aluminum nitrate micro powder and 1-2 parts of magnesium alon micro powder. Gas-phase substances of Si (g), Al (g) and Mg (g) can be formed in the stemming at high temperature by the monatomic silicon fine powder and the MgAlON micro powder in the raw materials and react with CO and N2 in the environment to generate ceramic whiskers such as SiC, Si3N4, AlN and MgAl2O4, and the generated ceramic whiskers are distributed in a staggered manner and are filled in pores of the stemming, so that the high-temperature strength and the volume stability of the stemming are remarkably improved.

The invention relates to the technical field of refractory materials, in particular to a waste magnesia-calcium brick-containing refractory material and a preparation method thereof, and the waste magnesia-calcium brick-containing refractory material comprises the following components: composite aggregate, calcium aluminate cement, urea resin-aluminum dihydrogen phosphate, active alpha-Al2O3 micro powder, silica micro powder and sodium tripolyphosphate. In the room-temperature spraying maintenance and low-temperature working stage, hydration of free CaO in the waste magnesia-calcium bricks and erosion of OH <-> are prevented through the hydrophobic effect of fluorinated polyphosphazene and modified zirconium oxide sol, and the compatibility and wettability of the composite aggregate and cement paste are improved through carboxylic acid groups of carboxyethyl silanetriol and polyethylene glycol monomethyl ether. According to the present invention, with the temperature rising, the aluminum dihydrogen phosphate forms the viscous liquid phase to wrap the aggregate so as to provide the temporary protection, the temperature continues to rise, the zirconium oxide and the nanometer Al2O3 react with the CaO and the MgO to generate the CaZrO3 and the MgAl2O3, the aluminum dihydrogen phosphate reacts with the nanometer Al2O3 in the system to generate the AlPO4, and the CaZrO3, the MgAl2O3 and the AlPO4 form the multi-phase fire-resistant structure so as to further improve the fire resistance of the fire-resistant material;

The invention provides a hot-state repairing material and a preparation method thereof, and belongs to the technical field of refractory materials. The hot-state repairing material provided by the invention is prepared from the following raw materials in percentage by mass: 87 to 98 percent of waste bricks, 0.5 to 4.5 percent of magnesium mineral micro powder, 0.5 to 5.0 percent of slag powder, 0.5 to 2.0 percent of dispersing agent, 0.2 to 1.5 percent of organic fiber and 0.1 to 0.5 percent of binding agent. According to the invention, waste bricks are used as aggregates, contain tiny pores, provide channels for reaction gas for heating the hot-state repairing material, and can be rapidly sintered with a furnace lining; the slag powder can be matched with the binder to improve the thermal adhesion rate of the thermal repairing material; the magnesium mineral micro powder can improve the reaction activity, and the dispersing agent assists the combination effect of the slag powder, so that the repairing material can be sintered through rapid reaction, and the compression strength and the erosion resistance are improved; and the organic fibers can form good filling among particles and fine powder, so that the compression strength and the erosion resistance are 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 an environment-friendly tundish magnesium-calcium dry material for thin-strip cast-rolling short-process steelmaking, and belongs to the technical field of refractory materials. The invention discloses an environment-friendly tundish magnesium-calcium dry material for thin-strip cast-rolling short-process steelmaking. The tundish magnesium-calcium dry material is prepared from the following raw materials in percentage by mass: 44-62.5% of magnesia aggregate, 22.5-24% of dolomite aggregate, 11-28% of magnesia fine powder and 3-5% of a binding agent, the binding agent is silica sol modified by a phosphate esterification aluminic acid ester coupling agent. The preparation method comprises the following specific steps: putting magnesia fine powder, a binding agent, magnesia aggregate and dolomite aggregate into a V-shaped mixing mill, uniformly stirring for 5 minutes, putting the stirred mixture into a mold, ramming, vibrating and molding to obtain a molded green body, curing at room temperature for 24 hours, demolding, drying at 200 DEG C for 24 hours, and carrying out heat treatment in an air atmosphere to obtain a dry material sample. According to the invention, the binding agent with good compatibility with a matrix is prepared by improving the binding agent, so that the binding agent can play a reinforcing role.

The invention discloses jaw crushing equipment for refractory material raw material processing, which belongs to the field of jaw crushers, and is characterized in that an upper crankshaft, a lower crankshaft, a reinforcing piston and an impact part are arranged on a fixed jaw plate mechanism by simulating the principle of an impact drill, so that the upper crankshaft and the lower crankshaft can be driven to rotate when a belt pulley I rotates; the reinforcing piston is promoted to reciprocate in the piston stroke channel, the impact pile section of the impact piece at the corresponding position in the piston stroke channel is continuously impacted in a reciprocating mode, the impact piece is driven to continuously reciprocate on the fixed jaw plate body, and finally the end of the impact rod continuously impacts the interior of a crushing cavity of the jaw crusher box body; and materials in the middle section position in the crushing cavity are impacted, and the crushing efficiency of the materials is improved.

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 discloses a moisture-proof and heat-insulating refractory material and a preparation method thereof, and relates to the technical field of refractory materials, and the moisture-proof and heat-insulating refractory material comprises dolomite, nano silicon dioxide, silica, an anhydrous binder and a moisture-proof agent. The synthesized moisture-proof agent is obtained by modifying asphalt through modified SBS obtained by grafting SBS and a monomer product containing terminal carbon-carbon double bonds, phosphate and a phthalonitrile structure, and has excellent flame retardance, high temperature resistance and waterproofness. And by using the nano silicon dioxide, the heat insulation performance of the refractory material can meet the requirements. The refractory material disclosed by the invention is excellent in refractoriness and moisture resistance and worthy of popularization and application.

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 discloses a CO2 mineralized solid waste-based cementing material for a refractory material, the CO2 mineralized solid waste-based cementing material comprises aluminate cement and a solid waste material subjected to CO2 mineralization treatment, and the solid waste material contains components capable of being subjected to mineralization reaction with carbon dioxide. According to the invention, the mineralizable solid waste material is mineralized by using carbon dioxide, and then the mineralized solid waste material is mixed with aluminate cement to obtain the cementing material, so that components such as free calcium oxide in the solid waste material are effectively stabilized, and unstable factors in the solid waste material are solved; in addition, the solid waste material subjected to CO2 mineralization treatment can promote generation of C2ASH8, so that crystal phase transformation of CAH10 and C2AH8 in the aluminate cement is inhibited, the problem that the later strength of the aluminate cement is reduced can be effectively solved, and the performance of the cement can be improved.

The invention provides a method for detecting the furnace temperature uniformity of a roller hearth type heat treatment furnace. The method is applied to a roller hearth type heat treatment furnace system comprising a furnace body, a heating device, a temperature sensor array and a medical service big data management system. The method comprises the steps that a temperature sensor array containing 14 measuring points is arranged at a specific position of a furnace body, and a furnace temperature data recording black box is fixed to the lower right corner of the furnace body; controlling the heating device to heat to a target process temperature of 920 DEG C and keeping the temperature constant for 30 minutes; the temperature data of the whole furnace area is collected every five minutes; and calculating a reference temperature and an absolute deviation value set of each measurement point through a medical service big data system, and evaluating the temperature field uniformity of the furnace body. And when the deviation exceeds a threshold value, the system generates a correction parameter group containing a heating zone power compensation coefficient and a refractory material density gradient value, and executes power redistribution or thermal insulation layer enhancement operation. High-precision detection and dynamic optimization of the temperature field uniformity of the roller hearth type heat treatment furnace can be realized, and the stability of a heat treatment process and the consistency of product quality are improved.

The application belongs to the technical field of refractory materials, and particularly relates to a corundum castable special for a circulating fluidized bed boiler and a preparation method thereof. The raw materials of the castable include 20-50 parts of white corundum particles with a size of 3-5 mm, 5-10 parts of alpha-alumina micropowder, 2-5 parts of microsilica, 1-5 parts of a binder, 0.5-1 part of a water reducing agent, and 1-5 parts of SiC-ZrB2 / chitosan quaternary ammonium salt modified graphene composite material. The castable has the properties of low apparent porosity, good mechanical properties, strong corrosion resistance and the like.

The invention belongs to the technical field of refractory materials, and particularly relates to a mullite refractory material with high mechanical property and a preparation method thereof. The mullite refractory material is prepared by taking coal gangue, bauxite and fly ash as raw materials, and the three industrial solid wastes are converted into the refractory material with high additional value, so that the concept of circular economy is met. According to the invention, coal gangue, bauxite and fly ash are used as raw materials, CaF2, V2O5 and lanthanide rare earth oxide are used as sintering aids, the problems of insufficient mechanical properties and overhigh sintering temperature of the mullite refractory material prepared by purely using coal gangue, bauxite and fly ash as raw materials are solved, and the performance of the mullite refractory material can be greatly improved. CaF2 and V2O5 promote substance transport and grain growth, and rare earth oxide inhibits excessive growth of grains. The balance of'promotion 'and'inhibition' is favorable for forming a compact, fine, uniform and interlaced mullite crystal network, and meanwhile, the mullite crystal network has high strength and good toughness.

The invention relates to the field of ultra-high-temperature smelting furnace temperature control systems, and discloses an ultra-high-temperature smelting furnace temperature control system based on a modular thermal field, which comprises a smelting furnace body used for accommodating raw materials and providing an ultra-high-temperature reaction environment of 1800-2200 DEG C; the modularized thermal field unit is fixed on the inner side of the smelting furnace body and comprises a plurality of standardized and interchangeable thermal field modules, and a lining of each thermal field module is made of a gradient composite ultra-high-temperature ceramic refractory material; the intelligent temperature control system comprises high temperature sensor modules which are arranged in all thermotechnical areas and used for collecting temperature, current and furnace charge data in real time; a data acquisition and preprocessing module, a machine learning control module and an execution module; a fail-safe module; and a man-machine interaction module. Compared with the prior art, the system has the advantages that through combination of modular thermal field design, gradient composite refractory materials, machine learning intelligent control and multi-physical field simulation, accurate, stable, efficient and safe control over the high-temperature smelting process is achieved.

The invention belongs to the technical field of refractory materials, and particularly relates to a carbon-containing refractory material based on a boron-based antioxidant and a preparation method of the carbon-containing refractory material. The carbon-containing refractory material based on the boron-based antioxidant comprises the following substances in parts by weight: 60-70 parts of magnesia particles, 10-15 parts of graphite, 5-10 parts of the boron-based antioxidant, 1-2 parts of silicon powder and 5-8 parts of a binding agent. The preparation method comprises the following steps: S21, raw material pretreatment: screening magnesia particles, and drying graphite; s22, proportioning: putting the magnesia particles, the graphite, the boron-based antioxidant, the silicon powder and the binding agent into a mixer, and mixing for 30-60 minutes; s23, molding: molding the mixed material under the pressure of 100 to 200 MPa; and S24, heat treatment: drying the molded green body, and sintering at 800-1600 DEG C for 3-5 hours to obtain the carbon-containing refractory material based on the boron-based antioxidant. The prepared product has good compression strength, strength retention rate after thermal shock, oxidation weight loss rate at 1800 DEG C and slag erosion resistance.

The present application relates to the field of nonferrous metallurgy, and particularly relates to a method for extracting molybdenum from refractory molybdenum ore by mechanical activation. The method comprises the following steps: step S1: mechanically crushing colloidal sulfur molybdenum ore to below 2 mm; step S2: adding an activation agent and water in a predetermined ratio to the molybdenum ore particles with a particle size of 2 mm or less after crushing, and ball-milling and activating to obtain activated ore; step S3: adding a leaching solution to the activated ore according to a solid-liquid ratio, controlling the leaching temperature at 20-100 DEG C, and leaching for 1-12 hours; and step S4: after leaching, separating the solid and liquid to recover molybdenum in the leaching solution. The present application can efficiently leach molybdenum in colloidal sulfur molybdenum ore into a solution, and the process is simple, environmentally friendly, and can realize efficient utilization of refractory colloidal sulfur molybdenum ore and associated minerals.

The invention belongs to the technical field of refractory materials, and particularly discloses a preparation method of an aerogel modified silicon mullite brick with high strength and low heat-conducting property. Comprising 5-15 parts of silicon carbide particles, 50-70 parts of bauxite A, 19-29 parts of bauxite B, 5-10 parts of bauxite fine powder, 1-2 parts of unmodified aerogel powder, 1 part of a solvent and 3-6 parts of alcohol. The preparation method comprises the following steps: 1, mechanically stirring and mixing silicon carbide particles, bauxite A, bauxite B, bauxite fine powder and a solvent to obtain a mixed raw material; 2, adding the aerogel powder into the mixed raw material, and continuously stirring and mixing to form aggregate; step 3, processing the aggregate through a brick press to obtain a green brick; and 4, placing the green brick in a tunnel kiln, carrying out gradient heating sintering, and discharging the green brick out of the kiln to obtain the aerogel modified silicon mullite brick. The refractory material has low heat conductivity, high strength and good fire resistance, and has remarkable economic benefits and environmental protection values.

The application relates to a bauxite-based corundum mullite hollow sphere with a gradient structure and a preparation method thereof, and belongs to the field of heat-insulating refractory materials. The preparation method comprises the following steps: firstly, high-alumina bauxite is beneficiated and classified and homogenized, then, according to a certain mass percentage, III-grade high-alumina bauxite, silica, mixed additives and an organic binder are uniformly mixed and granulated; taking spherical particles as cores, II-grade high-alumina bauxite and I-grade high-alumina bauxite are sequentially wrapped under the rotation of a granulator to obtain a non-homogeneous spherical particle blank body with a SiO2-rich interior; and finally, the corundum mullite hollow sphere with the gradient structure is obtained through high-temperature calcination. The refractory hollow sphere is designed with the gradient structure through the combined process of high-alumina bauxite classification and homogenization, coating forming and high-temperature calcination in-situ pore forming, the phase performance characteristics of corundum and mullite are fully utilized, and the refractory hollow sphere with the low thermal conductivity, the good corrosion resistance, the high use temperature and the excellent thermal shock resistance is developed.

According to the Ta-based refractory alloy reinforced by the silicide phase eutectic structure and the preparation method of the Ta-based refractory alloy reinforced by the silicide phase eutectic structure, nanoscale HfSi2 powder is introduced, and the alloy reinforced by the silicide phase eutectic structure is formed in the Ta-based alloy. According to the alloy, particles or powder of refractory metal elements such as Ta serves as a matrix raw material, nanoscale HfSi2 powder is introduced into the matrix raw material, an alloy ingot is prepared through a smelting process, and the alloy material is subjected to sufficient deformation recovery and homogenization through multiple times of pressure processing and high-temperature vacuum annealing treatment. A multi-level spherical eutectic structure exists in the alloy prepared through the method, the silicide phase serves as a strengthening phase, dislocation movement can be effectively inhibited, and the room-temperature mechanical property of the alloy is remarkably enhanced. The room temperature tensile elongation is about 30%, the yield strength is about 600 MPa, the tensile strength is about 700 MPa, and compared with a traditional Ta-based alloy, the tensile strength is obviously improved. The alloy of the system can be widely applied to structural parts by means of plastic deformation processing, heat treatment and the like.

The invention discloses a simple and practical slide sieve, and relates to the technical field of refractory material manufacturing. The simple and practical slide sieve comprises a slide carriage shell, a sieving assembly is arranged in the slide carriage shell, an overhauling assembly is arranged on one side of the slide carriage shell, the sieving assembly comprises a sieve arranged in the slide carriage shell, and lifting lugs are fixedly installed on the two sides of the sieve. The screening problem is solved by the self-gravity of the arranged screening assembly in the using process, only the low-power bin wall vibrator is periodically used for vibration, the cost is remarkably saved, the size is small, the weight is light, installation and maintenance are convenient, the structure is simple, multiple inspection holes are formed in the top of the slide sieve, the sieve net is convenient to overhaul and replace, and sampling and testing are convenient; the vibrating screen device replaces traditional vibrating screen equipment, is obvious in using effect especially in occasions for treating and screening lime or making sand and other fine powder materials, meanwhile, is small in installation space occupied area and light in weight, and can still achieve the screening function under the condition that the space layout is compact.

The invention discloses equipment and a method for laser auxiliary heating, magnetic control arc combination and static magnetic field coupling, and relates to the technical field of refractory and high-melting-point metal and metal-based composite materials. The problems of difficulty in melting and non-uniform components in the prior art are solved. The equipment comprises a vacuum melting furnace, a split water-cooled crucible, a laser auxiliary heating device, an electric arc generating device, a magnetic control device, a static magnetic field generating device and a central control cabinet. The method comprises the steps of charging and vacuumizing, laser preheating, starting arc and double-magnetic-field coupling smelting, and coordinately regulating and controlling multiple parameters through a control cabinet so as to realize accurate control on flowing and solidification structures of a molten pool. Through multi-energy field time sequence coupling and space cooperation of laser, magnetic control electric arc and static magnetic field, active intervention on the molten pool dynamics and solidification process is achieved, component homogenization is promoted, the solidification structure is refined, and the method is used for preparing high-temperature alloy and refractory and active metal material cast ingots with uniform components and excellent structure performance.

The invention relates to the technical field of refractory materials, in particular to a magnesia carbon brick for the bottom of a stainless steel smelting ladle and a preparation method of the magnesia carbon brick. The method comprises the following steps: immersing graphite into an ethanol solution added with a silane coupling agent to obtain silane-coated graphite; magnesium oxide and an aluminum nitrate solution are subjected to ball milling and then mixed, the mixture is roasted, and magnesium oxide particles with the surfaces coated with MgAl2O4 are obtained; sequentially carrying out cold press molding on the inner layer material, the middle layer material and the outer layer material to obtain a raw material blank; and sintering the raw material blank at high temperature in stages, spraying silica sol to the surface of a sintered body, and curing at high temperature. Through the gradient structure, the outer spinel shell layer and the pre-activated glass cooperate to block slag permeation, the gradient pressing density of the middle layer is combined to buffer thermal stress, the high graphite and the carbon fibers of the inner layer are combined to enhance thermal shock resistance, the breakthrough of dynamic slag resistance is achieved, and a high-stability and low-cost refractory material solution is provided for high-temperature industry; and intensive and sustainable development of equipment is promoted.

The invention relates to the technical field of rotary kiln incinerator multi-parameter control, in particular to a rotary kiln incinerator multi-parameter collaborative optimization control system which comprises a temperature monitoring module, a spraying control module, an ash monitoring module, a coking analysis module and a regulation and control feedback module. According to the method, the corresponding hazardous waste incineration stages in all the areas in the rotary kiln incinerator are monitored in real time, due to the fact that the incineration areas are extremely prone to melting to form viscous melts, the melts adhere to the inner wall of the rotary kiln to cause coking of the rotary kiln, flowing of materials is hindered along with thickening of the coking materials, and therefore the hazardous waste incineration efficiency is improved. As the refractory material is extremely easy to damage and fall off, the service life of the refractory material is prolonged by analyzing the ash, identifying the wall-hanging high-risk period and the formation cause of the coking product, timely regulating and controlling each operating parameter in the rotary kiln incinerator, identifying the coking caused by refractory material degradation through the damage early warning model, and timely responding to the shutdown of the rotary kiln. And effective coking control of the rotary kiln incinerator is realized.

The invention relates to the technical field of alumina functional material preparation, in particular to an alumina refractory material gradient sintering process based on critical temperature control, which comprises the following steps: mixing various additives such as alpha-Al2O3 powder, nano ZrO2, Yb2O3 and the like to prepare a suspension, and carrying out spray granulation and isostatic compaction; organic matters are removed through a low-temperature section, solid solution is promoted through a medium-temperature section, a strengthening phase reaction is initiated through a high-temperature section, and sintering is performed at different heating rates in a segmented manner; hCl gas is introduced into the high-temperature section, ultrasonic vibration is applied, CO2 is introduced during gradient cooling, and pressure is applied; and finally, through segmented nitriding treatment, a gradient structure from the surface layer to the interior is formed, and the material performance is improved. According to the process, a gradient structure is formed in the material through multi-stage temperature control, additive compounding, ultrasonic treatment and other treatments; the corrosion resistance, the thermal shock resistance and the mechanical property of the refractory material can be remarkably improved, the high-temperature industrial requirement is met, the application prospect is wide, and the benefit is high.

The invention relates to the technical field of thermal-shock-resistant refractory materials, and discloses a thermal-shock-resistant refractory material for a melting furnace and a preparation method of the thermal-shock-resistant refractory material. Comprising the following operation steps: step 1, uniformly mixing fused cast fused alumina zirconia, white corundum, aluminum oxide, chromic oxide and modified iron oxide, adding a modified polycarbosilane binder, heating to 250-300 DEG C, and mixing for 20-40 minutes to obtain a mixed material; 2, the mixed material is subjected to hot pressing treatment for 3-4 hours, and a blank is prepared; and sintering at 1600-2000 DEG C for 20-30 hours to obtain the thermal shock resistant refractory material.

The invention provides a dumping type scouring-resistant furnace nozzle device which comprises a furnace nozzle body, a bent flow guide groove is formed in the rear end of the upper portion of the furnace nozzle body, a discharging groove communicated with the bent flow guide groove is formed in the front end of the upper portion of the furnace nozzle body, first baffles are integrally formed at the left end and the right end of the upper portion of the furnace nozzle body correspondingly, and a first slope block is fixedly connected to the front end of the lower portion of the furnace nozzle body. The front end of the lower portion of the first slope block is fixedly connected with a second slope block, the front end of the lower portion of the second slope block is fixedly connected with a third slope block, the outer side of the furnace nozzle body is coated with a refractory material layer, the outer side of the refractory material layer is coated with a heat insulation layer, and the outer side of the heat insulation layer is coated with a steel structure layer. By means of the design, the problems that a traditional furnace nozzle is prone to scouring erosion, short in service life and high in replacement and maintenance cost when high-temperature molten metal is poured for a long time are solved, the structure is reasonable, practicability is good, the scouring resistance is improved through the multi-layer composite structure, meanwhile, molten metal turbulence can be reduced through the bent design of the flow guide grooves, scouring force is reduced, and the service life is prolonged.

The utility model relates to a double-saw-blade cutting machine for preparing a shaped refractory product sample. The double-saw-blade cutting machine comprises a saw blade, a saw blade transmission system, a spraying device, a sample carrying table and a track, the device further comprises a rack, a water collecting tank and a multi-sample clamp; the saw blade adopts a diamond saw blade, a needle bearing group is arranged between the saw blade transmission shaft and the bearing seat, and the track adopts a linear slide rail; the multi-sample clamp is provided with a V-shaped seat and a pressing plate, a sample is arranged in a V-shaped groove in the top of the V-shaped seat, and the top of the sample is fixed through the pressing plate. The problems that a guide rail of a refractory material cutting machine is prone to corrosion, stability is poor during saw blade cutting, cutting efficiency is low and the like are solved, a saw blade transmission shaft adopts a needle bearing, the radial size is small, load is high, movement is stable, the service life is long, a cutting machine track adopts a linear sliding rail, precision is high, corrosion is not prone to occurring, and maintenance is convenient; by adopting the multi-sample clamp, a plurality of samples can be fixed at multiple angles at one time, the operation is simple, and the sample preparation efficiency is greatly improved.

This thermally-expandable refractory material is provided with a base material on at least one side of an expansion layer containing a binder resin and thermally expandable graphite, wherein, when the thermally-expandable refractory material is heated at 185°C for 30 minutes, the rate of change in the thickness of the thermally-expandable refractory material is 20% or less, and the rate of change thereof in the TD and MD directions is 2% or less.

A method is provided for life cycle wear monitoring of a consumable refractory in an electric induction furnace used for heating and melting materials by accumulating laser imaging data of the refractory's inner surface periodically over the refractory's life cycle while the furnace is utilized in a foundry environment and processing the accumulated imaging data for comparative analysis with previous laser imaging data of the refractory's inner surface.

The dust recovery device for the refractory material crushing equipment comprises a crushing box, supporting legs are symmetrically and fixedly connected to the two sides of the bottom of the crushing box, discharging pipes are symmetrically inlaid in the lower inner portion of the crushing box, and sealing blocks are connected to the inner sides of the bottoms of the discharging pipes in an inserted mode; a recycling mechanism is arranged on one side of the bottom of the smashing box, and a sealing assembly is arranged in the recycling mechanism. Wherein the recycling mechanism comprises a recycling box arranged on one side of the bottom of the crushing box, and an annular plate is fixedly connected to the bottom of the crushing box, so that dust generated during discharging of the refractory material can be quickly sucked, and the effect of effectively purifying the air quality of a working area can be achieved; and therefore, the problem that workers suck dust by mistake and hurt the body can be effectively avoided, the refractory material crushing and recycling efficiency is greatly improved, and convenience is brought to the workers during use.