280 results about "Perlite" patented technology

The invention discloses efficient sound-absorbing lightweight aggregate foam concrete as well as a preparation method and application thereof, and belongs to the field of inorganic non-metallic materials. The high-efficiency sound-absorbing lightweight aggregate foam concrete is prepared from the following components in parts by weight: 85 to 95 parts of a sulfur-aluminum-iron series low-carbon cementing material, 5 to 15 parts of an auxiliary cementing material, 0.6 to 1.5 parts of a functional additive, 20 to 60 parts of unfired lightweight aggregate, 0.35 to 0.45 part of water and 0.5 to 1.5 L of prefabricated foam, the baking-free lightweight aggregate comprises the following components in parts by weight: 40-50 parts of a sulfur-aluminum-iron series low-carbon cementing material, 50-60 parts of byproduct gypsum, 0.7-1.5 parts of a chemical foaming agent, 15-22 parts of water and 5-8 parts of expanded perlite. According to the invention, a multi-stage-multi-scale pore structure body with expanded perlite pores, hydrogen peroxide foaming pores and physical foaming pores is constructed, so that the balanced broadband sound absorption performance of the material is realized, the sound absorption frequency range is adjustable, the sound absorption and noise reduction coefficient (NRC) of the material is greater than or equal to 0.80, the volume weight is less than or equal to 500 kg / m < 3 >, and the breaking strength is greater than or equal to 1.5 MPa.

The invention relates to a geopolymer-based non-expansive building fireproof coating, and belongs to the field of building materials. A geopolymer prepared from fly ash, granulated blast furnace slag, coal gangue, oil shale waste residues and sodium silicate water glass is used as a binder, and expanded perlite is used as a heat insulation filler to prepare the inorganic building fireproof coating. Meanwhile, tailings and basalt fibers are added, so that the contractibility and integrity of the geopolymer-based fireproof coating are improved. Compared with an organic fireproof coating, the environment-friendly fireproof coating has high environment friendliness in the production and preparation process and the use and action process in the case of a fire disaster. Compared with a traditional Portland cement-based fireproof coating, the fireproof coating has more excellent performance in the aspects of high temperature resistance, corrosion resistance and the like. According to the invention, the way of resource utilization of solid wastes is widened, and the building fireproof coating with excellent performance is provided.

This hot-rolled steel sheet has a predetermined chemical composition, a microstructure includes 80% or more of tempered martensite by a volume percentage and a remainder consisting of one or more of ferrite, pearlite, bainite, fresh martensite, and residual austenite, the tempered martensite includes 5×109 pieces / mm3 or more of precipitates containing Ti and having an equivalent circle diameter of 5 nm or less per unit volume, in a surface layer region that is a range from a surface to a 1 / 10 position of a sheet thickness, a sum of an average pole density of a crystal orientation group consisting of {211}<111> to {111}<112> and a pole density in a crystal orientation of {110}<001> is 6.0 or less, and a tensile strength is 980 MPa or more.

The invention discloses a high heat storage density stable thermochemical adsorption composite heat storage material and a preparation method thereof, the high heat storage density stable thermochemical adsorption composite heat storage material comprises 54%-57% by mass of mixed salt and 43%-46% by mass of a porous material, the mixed salt comprises MgSO4 and MgCl2, the mass ratio of MgSO4 to MgCl2 is 9: 1-6: 4, and the porous material is expanded perlite modified by nano alumina or a silane coupling agent. The high-heat-storage-density stable thermochemical-adsorption composite heat storage material provided by the invention is simple in preparation method, and the modified expanded perlite is used as a carrier of the mixed hydrated salt; the obtained composite heat storage material has excellent performance: the salt-containing load rate is 114-121%, the water absorption rate is 1.2-1.28 g / g, the heat storage density is 1123.5-1208.6 kJ / kg, the heat storage temperature is 133.4-141.3 DEG C, the structural strength is 10.346-12.631 kPa, the structural stability is 99.27-99.53%, and the stability is 79.7-83.3% after circulation for 30 times, that is, the composite heat storage material is high in heat storage density, high in water absorption rate, low in heat storage temperature, high in strength and not easy to scatter and fall off, and the composite heat storage material is suitable for large-scale production. And the material also has relatively good cycling stability.

The present invention relates to the technical field of refractory materials, and specifically discloses a lightweight and high-strength refractory ceramic material and a preparation method thereof, comprising 30%-40% lightweight filler (expanded perlite or glass microspheres), 20%-30% corundum or mullite, 10%-15% silicon carbide, 10%-20% high bauxite and 1%-5% dispersant, an oven is used to dry the lightweight filler, a ball mill is used to crush the corundum or mullite and silicon carbide, and a vibrating screen is used to screen them. The present invention ensures that the final ceramic material has the advantages of light weight, high strength, good thermal shock resistance, excellent thermal insulation, high temperature resistance, corrosion resistance, etc., is suitable for structural materials or thermal insulation materials in high temperature environments, and the precise control of humidity, temperature and molding pressure during the preparation process improves the uniformity and performance stability of the material, ensuring an efficient production process.

The invention provides a lightening composition and a well cementation cement slurry containing the same. The lightening composition comprises crushed crude pearlite, micro-silicon and fly ash.

The invention relates to the technical field of building materials, in particular to a cementing material for a fabricated wall prepared from multi-element solid waste and a preparation method of the cementing material. The preparation method comprises the following steps: 25-55 parts of fly ash, 25-65 parts of blast furnace slag, 8-10 parts of lime, 1-5 parts of desulfurized gypsum, 3-6 parts of a first mixture, 2-5 parts of a second mixture and 5-8 parts of an alkali activator; the mass ratio of the metakaolin to the bentonite to the superfine calcium carbonate in the first mixture is 3: 2: 1; the mass ratio of the vermiculite to the expanded perlite to the glass beads in the second mixture is 2: 2: 1. Through the synergistic excitation effect of Ca < 2 + > and Na < + > and the addition of the first mixture and the second mixture, the cementing material forms a more stable microstructure. A hydration product SEM figure shows that C-S-H and C (N)-A-S-H gel are symbiotic to form a three-dimensional network, pores are filled with needle-like ettringite crystals, and in combination with the brucite phase anchoring effect, the mechanical properties, such as strength and durability, of the material are remarkably improved.

The invention relates to a novel sound barrier plate, and belongs to the field of buildings and engineering. The formula comprises a bottom layer material formula and a surface layer material formula, wherein the bottom layer material formula comprises the following components in percentage by mass: 38-50% of diatomite; 15-30% of blast furnace slag; 5-12% of calcite; 2-6% of calcined talc; 2-5% of potassium feldspar; 3-8% of kaolin; 5 to 13% of bentonite; 5-10% of quartz; 2-6% of iron oxide red; 0.2%-0.8% of a foaming agent; 0.1 to 0.4 percent of a water reducing agent; the formula of the surface layer material comprises the following components in percentage by mass: 32-55% of perlite micro powder; 15-27% of calcined talc; 17 to 27% of bentonite; 4-10% of kaolin; 0.1-0.3% of a foaming agent; 0.1 to 0.4 percent of a water reducing agent; the preparation method of the sound barrier plate adopts a secondary material distribution forming process. The foamed ceramic composite sound barrier plate is of a double-layer structure and is provided with the sound insulation back plate; and through high-temperature firing, layering and cracking are avoided in use. The bottom-layer material replaces a base plate, so that the process production cost is reduced; the surface of the bottom layer material is flat after foaming and firing, cutting is not needed, and material waste is reduced. According to the invention, blast furnace slag is used as a raw material, which is an effective way for turning blast furnace slag into wealth.

The invention relates to the technical field of green building materials, in particular to phase-change energy-storage thermal insulation mortar and a preparation method of the phase-change energy-storage thermal insulation mortar. 25 to 40 parts of methyl palmitate; 120 to 180 parts of hydrophobic perlite; 8 to 15 parts of expanded graphite; 3-6 parts of phosphorus sheet-shaped aluminum nitride; 180 to 250 parts of sulphoaluminate cement; 60 to 100 parts of volcanic rock micro powder; 0.3 to 0.8 part of hydroxypropyl methyl cellulose; 0.6 to 1.2 parts of a polycarboxylic acid water reducing agent; 2 to 4 parts of nano aluminum oxide; 0.8 to 1.5 parts of propyl gallate; and 1-2 parts of zinc borate. Through the proportion design of the antioxidant flame-retardant microcapsules and the lightweight composite aggregate, the problems of poor thermal conductivity and insufficient durability of a traditional phase change material are solved. Through phase change material loading, interface modification and multi-component cooperative regulation, the thermal insulation performance, energy storage efficiency and structural stability are remarkably improved, and the material is suitable for the fields of building energy saving, intelligent temperature control and the like.

The invention discloses a steel-wood composite heat insulation fireproof door, and relates to the technical field of fireproof doors. The steel-wood composite heat insulation fireproof door comprises a mounting frame structure, a fireproof door leaf structure is hinged to the inner side of the mounting frame structure, a protective observation window structure is arranged on the inner side of the fireproof door leaf structure, and a locking structure is arranged on the front side of the mounting frame structure. Through the arrangement of the fireproof door leaf structure and the combined design of the fireproof filling ceramsite layer, the fireproof perlite plate layer, the rock wool layer, the heat insulation cotton layer and the flame-retardant sealing layer in the fireproof door leaf structure, the strength and stability of the door body are enhanced, the heat insulation effect is remarkably improved, the fireproof filling ceramsite layer and the fireproof perlite plate layer serve as inner layer materials, and the fireproof filling ceramsite layer and the fireproof perlite plate layer serve as outer layer materials; the door body has excellent fire resistance and heat insulation performance, invasion of high-temperature flames and heat can be effectively blocked, the rock wool layer and the heat insulation cotton layer serve as middle layer materials, the heat insulation effect of the door body is further improved, and heat transfer is reduced.

The invention belongs to the technical field of water ecological filtering materials, and particularly relates to a bioactive porous ceramic material and a production method thereof. The bioactive porous ceramic material is prepared from the following components in parts by weight: 8 to 20 parts of aluminate cement binding material, 1.0 to 2.0 parts of bamboo fiber, 1 to 7 parts of aluminum dihydrogen phosphate, 1 to 2 parts of rubber powder, 0.1 to 0.5 part of starch ether, 0.1 to 0.5 part of nano titanium oxide, 60 to 80 parts of pearl sand, 5 to 10 parts of zeolite powder, 7 to 20 parts of expanded perlite micro powder and 18 to 22 parts of water. The production process comprises the steps of master batch preparation, batch production, molding, drying and firing, detection, packaging, warehousing and the like, the process is simple, the firing temperature is low, the period is short, and the production cost is low. The product soluble water is alkalescent, and under the irradiation of sunlight, lamplight or ultraviolet rays, the dissolved oxygen concentration of water can be improved, a healthy living environment is provided for nitrifying bacteria, and the nitrifying efficiency of the nitrifying bacteria is improved.

The invention relates to a heat insulation cup capable of improving heat insulation performance, which comprises a heat insulation cup liner, a heat insulation coating and a heat insulation cup shell, the heat insulation coating is obtained by coating the surface of the heat insulation cup liner with heat insulation paint; the thermal insulation coating comprises the following components in parts by mass: 48-56 parts of waterborne polyurethane, 26-32 parts of waterborne acrylic acid, 12-16 parts of a composite hollow glass bead component and 8-10 parts of an expanded perlite aerogel thermal insulation material; the composite hollow glass beads comprise hollow glass beads and modified graphene. The vacuum cup has the effect of improving the heat preservation performance of the vacuum cup.

The invention relates to the technical field of building materials, and discloses a preparation method of a phase change material composite building thermal insulation material based on a porous structure. 13 to 18 parts of modified diatomite; 9 to 13 parts of nano cellulose aerogel; 7 to 11 parts of food-grade palmitic acid; 8 to 13 parts of microcapsule bio-based PCM; 0.9 to 1.4 parts of modified graphene; 11 to 15 parts of environment-friendly polylactic acid; 7 to 10 parts of montmorillonite; 1-2 parts of nano silicon dioxide; by compounding the expanded perlite, the modified diatomite and the nanocellulose aerogel, a basic framework with high porosity and low heat conductivity is constructed, heat conduction is effectively blocked, by introducing food-grade palmitic acid and microcapsule bio-based PCM, the material is endowed with heat storage and temperature regulation functions, phase change latent heat is improved, and the thermal conductivity of the material is improved. By adding modified graphene and nano silicon dioxide, an efficient heat conduction network and a heat insulation structure are formed, and the heat conductivity coefficient of the composite building heat preservation material is further reduced.

The invention relates to the technical field of building ceramics, and particularly discloses a high-gloss light-weight glazed brick and a preparation method thereof.The preparation method comprises the steps that 1, composite high-aluminum mud, expanded perlite, nano-zirconia and graphene are mixed and subjected to ball milling, and green body powder is obtained; step 2, carrying out compression molding on the green body powder to form a green body, applying ground glaze on the green body, carrying out ink-jet printing, and carrying out shower coating of transition glaze and high-transmittance wear-resistant glaze to obtain a green brick; and step 3, drying the green brick prepared in the step 2, sintering, and carrying out composite polishing to obtain the high-gloss light glazed brick. The prepared high-gloss light-weight glazed brick not only has higher Moh's hardness, but also has the characteristic of remarkable light weight, so that the weight of the brick body is greatly reduced, the brick body also has higher wear-resistant grade and glossiness, scratches and wear in daily use can be effectively resisted, and the completeness and attractiveness of the surface can still be kept after the brick is used for a long time.

A hot rolled steel sheet having a composition comprising of the following elements,0.02 % ≤ Carbon ≤ 0.06 %, 1.1 % ≤ Manganese ≤ 1.60%,0.01% ≤ Aluminum ≤ 0.08 %, 0.01% ≤ Niobium ≤ 0.07%, 0.05 % ≤ Titanium ≤ 0.15%, 0.0005% ≤ Calcium ≤ 0.005%, 0% ≤ Phosphorus ≤ 0.03 %, 0 % ≤ Sulfur ≤ 0.015 %, 0 % ≤ Nitrogen ≤ 0.02%,and can contain one or more of the following optional elements 0.001% ≤ Silicon ≤ 0.09%, 0% ≤ Chromium ≤ 0.2%, 0 ≤ Copper ≤ 0.25%, 0% ≤ Nickel ≤ 0.2%,0% ≤ Vanadium ≤ 0.1%, 0 % ≤ Boron ≤ 0.003%, 0 % ≤ Magnesium ≤ 0.010%, 0% ≤ Cerium≤ 0.1%, 0% ≤ Zirconium ≤ 0.010%,the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet comprising in area fraction, 35% to 75% Bainite, 25% to 65% ferrite, from 0% to 2% Pearlite and Martensite­Residual Islands from 0% to 2% wherein said hot rolled steel sheet has an inclusion density of 200 inclusions per square micro­meter, the inclusions having size of 2 microns or more being 25% or less of the total number of inclusions.

The invention relates to the field of building materials, in particular to a template-free multi-layer composite structure self-heat-preservation sound-insulation light inner wall which comprises a light foam concrete layer, a heat-preservation sound-insulation layer, a waterproof layer and a decorative layer. The light foam concrete layer is composed of cement, fly ash, hydrogen peroxide, polyphenyl particles, glass fibers, crushed crude pearlite, vermiculite powder, calcium stearate, expanded graphite, magnesium aluminum hydroxide, magnesium calcium lignosulphonate, ammonium molybdate pentaerythritol ester and titanate melamine salt. According to the contrast test, the construction efficiency, the light weight effect, the heat preservation performance, the sound insulation performance, the waterproof performance and the like of the building interior wall are remarkably superior to those of a traditional interior wall technology, and the building interior wall has wide application prospects and market value.

The invention relates to the technical field of foamed ceramics, in particular to a foamed ceramic and a preparation method thereof. The foamed ceramic comprises the following raw materials in parts by weight: 30-50 parts of waste cathode carbon blocks, 15-30 parts of rice hull ash, 15-30 parts of fly ash, 3-10 parts of calcium carbonate, 3-10 parts of expanded perlite and 2-5 parts of basalt fibers. According to the invention, the waste cathode carbon block is pretreated to form a porous structure, the porous structure and gas decomposed by calcium carbonate are jointly used as a gas source at a high temperature to generate initial pores, and a glass phase formed after rice hull ash activation has certain fluidity during sintering, and can fill pores, adjust pore surface tension and promote uniform expansion of the pores; the basalt fibers are inserted into the matrix in a three-dimensional bracket form, and collapse of pores due to high-temperature shrinkage or gas escape is prevented through physical support, so that the stability and uniformity of the pore structure are ensured, and the heat insulation performance of the foamed ceramic is improved.

The utility model discloses an environment-friendly building prefabricated wallboard which comprises a wallboard body and exterior structures arranged on the two sides of the wallboard body, the wallboard body is provided with a gypsum wall core, perlite layers are arranged on the two sides of the gypsum wall core respectively, gypsum boards are arranged on the outer sides of the perlite layers, ceramsite layers are arranged on the outer sides of the gypsum boards, and the ceramsite layers are arranged on the outer sides of the gypsum boards. And a glass wool layer is arranged on the outer side of the ceramsite layer. The wallboard body adopts the gypsum wall core, the gypsum wall core is light in weight, non-toxic and pollution-free, the perlite layers are arranged on the two sides of the gypsum wall core, the heat preservation performance and the wall hardness of the wallboard body can be improved, and the ceramsite layer arranged outside the gypsum board has the functions of heat preservation, heat insulation and high temperature resistance. The glass wool layer is arranged on the outer side of the ceramsite layer, the good sound insulation effect is achieved, the glass wool layer is adopted for the exterior structure, and the glass wool layer, the ceramsite layer, the gypsum wall core and the perlite are all natural materials and are environmentally friendly.

The invention discloses a method for preparing a high-performance closed-cell perlite material by a chemical method, the prepared high-performance closed-cell perlite material is mainly used in the field of buildings, and the method comprises the following steps: S1, expanding; s2, film covering; s3, dispersing; s4, grading; according to the invention, a layer of silica sol film is formed on the surface of the closed-cell perlite, the film layer not only significantly reduces the volume shrinkage of the closed-cell perlite in the subsequent slurry stirring process, but also effectively hinders the expansion of cracks in the perlite and greatly reduces the cracking risk, and meanwhile, the heat conductivity coefficient of the material is also reduced by film coating treatment, so that the thermal conductivity of the material is improved. The thermal insulation performance is obviously improved; according to the drying furnace, through cooperative use of the drying mechanism and the adjusting mechanism, the air outlet pipe can be driven to swing up and down in a reciprocating mode, so that the air blowing angle of the air outlet pipe is adjusted according to use requirements, hot air can be blown to different areas in the furnace body, the air blowing range is widened, and the perlite drying effect is improved.

The invention discloses a lightweight high-strength ceramsite proppant based on composite coating and low-temperature densification and a preparation method thereof. The coating proppant comprises a ceramsite proppant and a coating layer coating the surface of the ceramsite proppant, relates to the technical field of petroleum and natural gas engineering fracturing. The ceramsite proppant comprises bauxite, perlite, a composite sintering aid, B2O3 and AlF3. The composite sintering aid comprises MnO2 and TiO2; wherein the weight part ratio of the bauxite to the perlite to the composite sintering aid to the B2O3 to the AlF3 is 80: 20: (2.5-7.5): (3-12): (3-12); the low-grade bauxite and high-silicon raw material system is adopted, and a proper amount of sintering aid is introduced, so that the sintering temperature is effectively reduced, and the energy consumption is reduced; meanwhile, the volume density of the ceramsite proppant is reduced, and a lightweight product is obtained.

Provided is a square steel pipe having a low yield ratio and excellent low-temperature toughness and ductility.　The square steel pipe according to the present invention has a prescribed steel component composition. The flat plate section of the pipe has, at the central area thereof in the plate thickness, a steel structure in which: ferrite is the main phase; the area ratio of a second phase, which is composed of one or more selected from perlite, pseudo-pearlite, and upper bainite, is 5-30%; and the average crystalline particle diameter is 10.0-30.0 μm. The steel structure includes at least 500 pieces, per mm2, of pearlite and pseudo-pearlite having an equivalent circle diameter of 2 μm to 20 μm. The yield strength of the flat plate section is 295 MPa or more, the tensile strength of the flat plate section is 400 MPa or more, the yield ratio of the flat plate section is 0.85 or less, the uniform elongation of the flat plate section is 8.0% or more, and the elongation at break of the flat plate section is 27.0 or more. The Charpy absorption energy at -10°C of a corner section is 80 J or more, and the ductile-to-brittle transition temperature of the corner section is -10°C or less.

The invention relates to modified closed-cell expanded perlite and a preparation method thereof, and the expanded perlite is prepared by the following steps: (1) preheating and drying: preheating and drying a perlite raw material at the temperature of 300-450 DEG C for 5-30 minutes to obtain the perlite raw material with the bound water content of 1.5-3%; (2) preliminary puffing: pre-puffing for 5-10 seconds at the temperature of 800-900 DEG C; (3) cooling the preliminarily-expanded expanded perlite to normal temperature, spraying a certain amount of water glass solution on the surface of the expanded perlite, then spraying an aluminum sulfate solution, and continuously stirring for a period of time; the continuous stirring time is 5-10 minutes; and (4) carrying out secondary puffing at 1100-1150 DEG C for 2-10 seconds to obtain the closed-cell expanded perlite.

The invention belongs to the technical field of ceramic heat accumulators, and relates to an RT0 combined honeycomb ceramic heat accumulator and a production process thereof. Comprising the following steps: mixing aluminum oxide powder, diatomite, expanded perlite, rare earth oxide, carbon nanofibers, kaolin, quartz sand, titanium dioxide, boron nitride powder, silicon carbide powder, zirconium oxide powder, aluminum oxide fibers, glass powder, yttrium-stabilized zirconium oxide, aluminum oxide hollow spheres and aluminum borate whiskers; drying the mixed material, finely grinding the dried material by using a ball mill, and screening by using a screen; the sieved mixture is put into mixing equipment, 2% of plasticizer and 1% of preservative are added for mixing, and mixed pug is obtained; and standing the mixed pug to obtain a blank. The service life of the heat accumulator is prolonged, and the heat exchange efficiency of the heat accumulator is improved.

It has been unexpectedly discovered that the addition of a natural or other pozzolan to non-spec coal ash significantly improves the properties of the non-spec coal ash to the extent it can be certified under ASTM C618 and AASHTO 295, as either a Class F or Class C coal ash. The natural pozzolan may be a volcanic ejecta, such as pumice or perlite. Other pozzolans may also be used for this beneficiation process. Many pozzolans are experimentally tested and may be used to beneficiate non-spec coal ash into certifiable Class F coal ash. Additionally, this disclosure provides a method of converting a Class C coal ash to a more valuable Class F coal ash. This discovery will extend diminishing Class F coal ash supplies and turn non-spec coal ash waste streams into valuable, certified coal ash pozzolan which will protect and enhance concrete, mortars and grouts.

It has been unexpectedly discovered that the addition of a natural or other pozzolan to non-spec coal ash significantly improves the properties of the non-spec coal ash to the extent it can be certified under ASTM C618 and AASHTO 295, as either a Class F or Class C coal ash. The natural pozzolan may be a volcanic ejecta, such as pumice or perlite. Other pozzolans may also be used for this beneficiation process. Many pozzolans are experimentally tested and may be used to beneficiate non-spec coal ash into certifiable Class F coal ash. Additionally, this disclosure provides a method of converting a Class C coal ash to a more valuable Class F coal ash. This discovery will extend diminishing Class F coal ash supplies and turn non-spec coal ash waste streams into valuable, certified coal ash pozzolan which will protect and enhance concrete, mortars and grouts.

This invention discloses a lightweight, high-strength ceramsite proppant based on composite coating and low-temperature densification, and its preparation method. The coated proppant includes a ceramsite proppant and a coating layer covering the surface of the ceramsite proppant. It relates to the field of fracturing technology in oil and gas engineering. The ceramsite proppant includes bauxite, perlite, a composite sintering aid, B2O3, and AlF3; the composite sintering aid includes MnO2 and TiO2; wherein the weight ratio of bauxite, perlite, composite sintering aid, B2O3, and AlF3 is 80:20:2.5-7.5:3-12:3-12. This invention uses a low-grade bauxite and high-silica raw material system, combined with the introduction of an appropriate amount of sintering aid, effectively reducing the sintering temperature and energy consumption; simultaneously reducing the bulk density of the ceramsite proppant, resulting in a lightweight product.

The utility model relates to the technical field of perlite processing, and discloses a perlite ore sand grading vibrating screen which comprises a screening cylinder. The sorting assembly comprises sieve plates, scraping plates, a vertical shaft, a poke rod, a protruding block and connecting rings, the sieve plates are fixedly installed on the inner wall of the screening barrel, the vertical shaft is rotationally connected with the screening barrel, a motor is arranged at the top of the screening barrel to drive the vertical shaft, the connecting rings are fixedly installed on the wall face of the vertical shaft, and the same scraping plates are fixedly installed on the side walls of the connecting rings; inclined poke rods continuously collide with all the protruding blocks, a sieve plate generates certain vibration, then vibration screening of the sieve plate is promoted, in the rotating process of a vertical shaft, the vertical shaft drives a connecting ring and a scraper to rotate, the scraper can scrape and drive material residues on the sieve plate and promote the material residues to be discharged from a residue discharging groove, motion interference between the scraper and the protruding blocks can be reduced, and the screening efficiency is improved. And operation stability is guaranteed, efficiency is high, and the effect is good.

The invention provides glassy shell expanded perlite as well as a preparation method and application thereof, and the preparation method comprises the following steps: pretreating perlite ore to obtain first perlite particles; proportioning the first perlite particles and a binder according to a mass ratio, and uniformly mixing the first perlite particles and the binder to obtain second perlite particles; proportioning the second perlite particles and the vitreous cladding powder according to a mass ratio, uniformly mixing and granulating to obtain third perlite particles; drying and preheating the third perlite particles to obtain fourth perlite particles; and carrying out high-temperature expansion treatment on the fourth perlite particles to obtain the vitreous shell expanded perlite. The expanded perlite prepared by the invention has the characteristics of high expansion time, small bulk density, high cylinder compressive strength, low heat conduction coefficient, small water absorption rate, acid and alkali corrosion resistance and the like; the material can be widely used for producing light materials, heat preservation and insulation materials, sound absorption and insulation materials, decorative materials and fireproof flame-retardant materials, and can be used as water surface floating heat preservation materials, sunscreen materials, reflective materials and the like.

The invention relates to the field of building materials, and discloses a coal cinder-based light thermal insulation castable and a preparation method thereof, and the coal cinder-based light thermal insulation castable is prepared from the following raw materials by mass: 50%-65% of industrial kiln coal cinder, 15%-20% of Portland cement, 8%-15% of perlite, 5%-10% of vermiculite, and 3%-5% of clay. And the application range of the temperature is 800-1000 DEG C. According to the coal cinder-based light thermal insulation castable prepared by taking the industrial kiln coal cinder and the Portland cement as main raw materials, the purchase cost of the raw materials is reduced, the effect of reducing the production cost can also be achieved, and the castable has the advantages of lower heat conductivity coefficient, low volume weight and high drying compressive strength, and is suitable for being used at the working condition temperature of 800-1000 DEG C.

The present invention provides a steel material that can suppress the occurrence of cracks during cold forging, even when cold forging is performed without spheroidizing annealing. [Solution] The steel material of this embodiment has a chemical composition in mass%, consisting of C: 0.30-0.60%, Si: 0.01-0.10%, Mn: 0.30-2.00%, P: less than 0.050%, S: 0.001-0.050%, Al: 0.001-0.200%, N: less than 0.020%, Cr: 0.01-0.40%, O: 0.0030% or less, and the remainder being Fe and impurities. The total area ratio of ferrite and perlite is 90% or more, the area ratio of perlite is 40% or more, the average particle size dP of perlite grains is 10.0 to 40.0 μm, the average particle size dP of perlite grains and the standard deviation σP of perlite grain size satisfy equation (1), the average particle size dF of ferrite grains is 25.0 μm or less, and the difference between the hardness of ferrite and the hardness of perlite is 140 HV or less. σP / dP<0.80 (1)