61results about How to "Good resistance to slag erosion" patented technology

The invention belongs to the technical field of low carbon magnesium carbon brick fire proof materials, in particular to a low carbon magnesium carbon brick containing B4C-C composite powder and nanometer TiC powder and a preparation method thereof. The adopted technical proposal comprises: mixing 60-75wt percent magnesia particles, 15-30wt percent magnesia fine powder, 1-5wt percent coarse-grained squama graphite, 1-5wt percent thin-grained squama graphite, 0.5-1.5wt percent carbon soot, 1-3wt percent metal aluminium powder, 1-3wt percent metal silicon powder, 0.1-1.0wt percent B4C-C composite powder and 0.05-0.4wt percent nanometer TiC powder, additionally adding 3-5wt percent organic bond, press forming after calendaring, and heat treatment 24 hours under the condition of 180 DEG C to 240 DEG C. The carbon content of prepared carbon magnesium carbon brick is less than 6 percent, and the carbon magnesium carbon brick has the characteristics of obvious antioxidant effect, strong high temperature strength, good thermal shock resistance, strong anti-slag corrosion and low cost.

The invention discloses a composite spinel-zirconium refractory material for smelting colored heavy metal. The technical scheme is as follows: the material comprises 30-45 parts of 5mm-0mm emery, 10-30 parts of 5mm-0mm magnesia chromite clinker,15-25 parts of 3mm-1mm magnalium spinel clinker, 7-20 parts of 3mm-0mm magnesite clinker, 1-5 parts of chrome green less than or equal to 0.045mm and 2-8 parts of zirconium dioxide less than or equal to 0.045mm by weight part and a bonding agent is aluminium dihydrogen phosphate liquid the adding amount of which is 3-15% of the total weight of the emery, the magnesia chromite clinker, the magnalium spinel clinker, the magnesite clinker, the chrome green and the zirconium dioxide. A hydraulic press is adopted for molding and the composite spinel-zirconium refractory material is sintered by a hyperthermia tunnel kiln. The content of Cr2O3 of the composite spinel-zirconium refractory material is less than 10%, so that the composite spinel-zirconium refractory material not only is environment-friendly, but also has better slag erosion resistance, high-temperature melt washing resistance, metal melt permeation resistance and thermal shock stability performance.

The invention discloses an unfired magnesia-alumina spinel brick. The unfired magnesia-alumina spinel brick comprises the following chemical components by mass: 80 to 90% of fused magnesia, 5 to 15% of magnesium-rich magnesia-alumina spinel, 1 to 3% of micro alumina powder, 1 to 3% of aluminum-silicon alloy powder and 0.2 to 0.6% of B4C. The chemical components are bonded together by using 3.5 to 5 wt% of an added binder. The content of magnesium oxide in the fused magnesia is greater than 98 wt%, and the content of magnesium oxide in the magnesium-rich magnesia-alumina spinel is greater than 30 wt%. The unfired magnesia-alumina spinel brick provided by the invention has excellent slag reaction resistance, slag penetration resistance, anti-stripping performance, anti-scouring performance, resistance to oxidation and a long service life, does not include the harmful element--chromium, avoids pollution and harm to human beings and the environment, needs low production cost and has a wide application scope.

The invention discloses a novel slide plate brick for an automatic slag-retaining slide gate of a converter and a preparation method of the slide plate brick. The slide plate brick is characterized by containing the following components in percentage by weight: 58%-68% of tabular corundum, 6%-8% of 98 magnesia, 8%-11% of electrically-fused spinel, 3%-5% of graphite, 4%-7% of a-aluminum oxide powder, 1%-2% of sintering agent, 2%-7% of aluminum-silicon alloy powder and 4%-5% of resin. The slide plate brick can be prepared from the components through the processes of mixing, shaping, drying, sintering, oil immersing, roasting, and machining. By virtue of adjustment on the formula of the slide gate brick and simplification on the production technology of the slide gate brick, the comprehensive performance of the slide gate brick is enhanced, the direct benefit of slag-free tapping with the slide plate brick is high, and beneficial conditions are provided for development of good-quality steel grades, so that the slide plate brick and the preparation method of the brick have a very wide application prospect and remarkable economic and social benefits.

The invention discloses a method for preparing a tabular corundum brick for a working lining of a carbon-free steel ladle. The method comprises the steps of uniformly mixing the raw materials of the tabular corundum brick, and sequentially carrying out compression molding pressing and low-temperature baking to obtain the tabular corundum brick, wherein the tabular corundum brick comprise the following raw materials in parts by weight: 76-91 parts of tabular corundum, 0.5-9 parts of magnesia, 0.5-20 parts of magnesium-aluminum spinel, 1-9 parts of activated aluminum oxide ultrafine powder, 0.1-2 parts of activated silicon oxide ultrafine powder, 1.5-5 parts of a magnesium-aluminum cementing agent and 1.5-2.5 parts of water. The method for preparing the tabular corundum brick for the working lining of the carbon-free steel ladle is simple, the service life of the tabular corundum brick is long and free of carbon, and the tubular corundum brick can satisfy the demands on clean steelmaking.

The invention discloses a special casting material for a main iron runner of an iron-making blast furnace. The special casting material is prepared from brown fused alumina granules, white alundum granules, white alundum powder, plate corundum micro powder, chromium concentrate, silicon carbide granules, silicon carbide powder, spherical asphalt, activated aluminum oxide, silica powder, pure calcium aluminate cement, metal silicon powder, metal aluminum powder, additives, anti-explosion fiber, carbon composite micro powder and the like according to a certain ratio. The special casting material has the advantages that aiming at problems that a main iron runner casting material of the blast furnace is generally poor in furnace slag corrosion resistance, slag lines are easy to deteriorate, the operation and the yield of the blast furnace can be affected, and the like, a refractory material which is good in slag corrosion resistance and good in abrasion and flushing resistance is compounded. According to the scheme, co-ground composite micro powder which is not easy to infiltrate by molten iron and slag is introduced, the silicon carbide granules, powder materials, plate corundum micro powder and chromium concentrate are introduced to improve the abrasion and flushing resistance, and by optimizing a binding agent and the additives, the comprehensive high temperature properties of the casting material for the main iron runner is ensured.

The invention discloses a flexible composite spinel tin refractory material for pyrometallurgical noble metal smelting and a preparation method of the flexible composite spinel tin refractory material. According to the flexible composite spinel tin refractory material for the pyrometallurgical noble metal smelting and the preparation method of the flexible composite spinel tin refractory material, eutectic aluminum chromium, magnesium chromium spinel and magnesium aluminum spinel are used as a main crystal phase; electric-melting zirconium oxide is introduced into a substrate part; the thermal shock resistance of a product is improved by producing micro-cracks by converting a crystal form of the zirconium oxide during a firing process, and meanwhile, the crystal lattice structure is changed by forming magnesium tin spinel by introducing tin oxide, so that the flexibility and the performance of resisting noble metal smelting slag erosion of a product are improved. The flexible composite spinel tin refractory material for the pyrometallurgical noble metal smelting and the preparation method of the flexible composite spinel tin refractory material have great significance on solving the problems about thermal spalling and structural spalling damage of a noble metal smelting furnace refractory lining material during a using process, and the overall service life of the noble metal smelting furnace refractory lining material is prolonged.

The invention discloses an in-situ formed beta-Sialon combined corundum prefabricated member and a production method thereof. The prefabricated member is formed by adopting the following steps of: with elemental silicon powder, corundum particles and fine powder as raw materials and with hydrated alumina, activated alumina micropowder and silicon dioxide micropowder as binding agents, adding metal aluminum powder treated by adopting a sol-gel process; adding water, vibrating, pouring and forming; demoulding, curing and drying; and reacting and sintering in the nitrogen gas atmosphere to obtain the prefabricated member. The prefabricated member comprises the following components in parts by weight: 70-80 parts of corundum particles, 3-12 parts of alumina micropowder, 0-5 parts of silicon dioxide micropowder, 0.5-5 parts of hydrated alumina, 3-15 parts of elemental silicon powder, 0.3-2 parts of metal aluminum powder subjected to surface treatment and 0.05-0.30 part of organic water reducing agent as a dispersing agent, based on the total weight percentage of the raw materials. According to the invention, the defects of poor thermal shock resistance, poor stripping resistance, high temperature and low strength in the currently-general corundum-based castable are overcome; and the in-situ formed beta-Sialon combined corundum prefabricated member can be expected to be applied to ceramic cups of blast furnaces, ladle liners, permeable bricks for ladles, chemical industries and the like as well as has the characteristics of high strength, favorable stripping resistance and the like.

The invention relates to a high-aluminum insulating refractory raw material with titanium-iron slag as a main material and a preparation method thereof. The preparation method comprises the following steps: immersing crushed titanium-iron slag in water of 90-95 DEG C for 1-2 h, filtering, drying, and screening; adding a hydrochloric acid solution into the screened titanium-iron slag particles, stirring, washing and carrying out suction filtration, and wet-grinding to obtain wet-ground titanium-iron slag powder; adding the wet-ground titanium-iron slag powder and aluminum powder into a mixer, and mixing to obtain a mixture; Adding a phosphoric acid solution into the mixture, uniformly mixing, vibrating for moulding, and maintaining; finally placing the product into a muffle furnace, heating to 1355-1420 DEG C at the heating rate of 3-5 DEG C/min, carrying out thermal insulation, cooling with the furnace to room temperature, and crushing to obtain the high-aluminum insulating refractory raw material with titanium-iron slag as the main material. The method of the invention has characteristics of simple process, low production cost and no special requirements on equipment. The prepared high-aluminum insulating refractory raw material with titanium-iron slag as the main material has small heat conductivity coefficient, high cylinder compressive strength and good resistance to corrosion of slag.

The invention discloses a microporous corundum preparation method, which comprises: mixing and grinding multiple raw materials into powder with a certain fineness, preparing a billet, and sintering the billet at a temperature of 1700-1950 DEG C to obtain the microporous corundum, wherein the raw materials comprise, by mass, 60-100% of industrial aluminum oxide, 0-20% of alpha-aluminum oxide, 0-30%of gamma-aluminum oxide, 0-10% of aluminum hydroxide, and 0-3% of polyvinyl alcohol. According to the present invention, the preparation method is simple, and is suitable for industrial production; and the product is mainly characterized in that the corundum crystal contains a large number of sub-micron and nano-scale closed gas pores, and have characteristics of low thermal conductivity, good thermal shock resistance, good slag corrosion resistance, energy saving, thermal insulation and high refractoriness, and can replace sintered corundum.

The invention discloses a ramming material for an iron notch of a smelting reduction furnace; the ramming material is Al2O3-SiC-Si3N4 ramming ramming material, and comprises the following chemical components by mass: 10-18% of bauxite; 10-32% of electricly-fused corundum; 6-16% of andalusite; 21-30% of silicon carbide powder; 3-10% of silicon nitride powder; 4-10% of alumina micro powder; 3-8% of bentonite; and 1-3% of boron carbide powder; and the chemical components are boned together by an externally added anhydrous binder. The ramming material for the iron notch of the smelting reduction furnace has high density, high strength, good resistance to high temperature melting slag, molten iron scouring resistance, resistance to slag corrosion, oxidation resistance and the like, is good in plasticity and construction performance, and can improve the smelting reduction furnace service life, improve safe production of the smelting reduction furnace, reduce the repair and downtime of the smelting reduction furnace, and avoid reducing of the iron and steel production.

The invention relates to a high-quality dolomite-periclase-calcium zirconate composite fireproof material suitable for smelting stainless steel, special steel AOD furnace and refining ladles. The adopted raw materials mainly comprise, by weight, 8-10% of magnesium calcium sand with a particle size of 5-8 mm, 9-18% of magnesium calcium sand with a particle size of 3-5 mm, 10-22% of magnesium calcium sand with a particle size of 1-3 mm, 5-10% of calcium zirconate with a particle size of 0.5-1 mm, 5-10% of magnesia with a particle size of 0.5-1 mm, 3-10% of 600 mesh electric melting calcium zirconate, 15-24% of magnesia with a particle size of less than or equal to 0.5 mm, 3-10% of 400 mesh 98 large crystal magnesia, 1-3% of a binding agent, and 1-2% of a sintering agent, wherein the raw materials are subjected to mixing, molding, sintering, finished product inspection, package and other steps to prepare the material.

The invention relates to the technical field of amorphous refractory materials and specifically to an environment-friendly magnesia carbon gunning material for an RH furnace and a preparation method thereof. According to the gunning mix, a post-sintering regenerated magnesia carbon material and magnesia are used as main raw materials; high-grade aluminum oxide and magnesium oxide are added as basic raw materials; and a self-made aluminum-magnesium binding agent fully calcined at a high temperature and the like are utilized to prepare the environment-friendly magnesia carbon gunning mix for theRH furnace. After trial of the obtained gunning material, the gunning service life of the RH furnace is prolonged to 2-4 times from the original 1-2 times, and anti-scouring resistance and bonding strength are obviously improved. The magnesium carbon gunning material produced by adopting a scheme in the invention has the advantages that the capital is saved by 800 yuan per ton compared with original magnesium gunning materials, greater economic benefits can be brought to enterprises every year, and the purposes of reducing cost, increasing efficiency and recycling wastes are achieved.

The invention belongs to the technical field of high-duty refractory for electric furnace and converter linings and ladle linings and in particular relates to an unburned magnesia-carbon brick and a preparation method thereof. The unburned magnesia-carbon brick is characterized by comprising the following components in parts by weight: 80-90 parts of fused magnesite (more than or equal to 97% of MgO, the granularity of 0.1-5mm and the moisture content of less than or equal to 4%), 12-16 parts of graphite (more than or equal to 98% of C, the granularity of less than or equal to 400 meshes, and the moisture content of less than or equal to 0.15%), 0.5-1.5 parts of metal aluminum powder (more than or equal to 98% of Al and the granularity of less than or equal to 400 meshes), 1-3 parts of an aluminum magnesium alloy (more than or equal to 98% of Al+Mg and the granularity of less than or equal to 400 meshes), 0.2-0.8 part of boron carbide (more than or equal to 99% of BC4 and the granularity of 200-325 meshes), 1-2.5 parts of high temperature pitch (softening temperature of more than or equal to 150 DEG C, more than or equal to 50% of residual carbon and the granularity of 100-200 meshes), 0.2-0.5 part of a rare earth oxide (the granularity of 300-350 meshes), 3-5 parts of ceramic bond, 3-4 parts of a complex magnesium-aluminum cementing agent and 1-3 parts of water. The unburned magnesia-carbon brick disclosed by the invention has the advantages of simple and safe preparation method, low cost, no need of high-temperature firing, high density, high strength, high corrosion resistance, molten metal resistance, high oxidation resistance, energy conservation and emission reduction and the like.

The invention relates to a low-carbon magnesia carbon brick and a preparation method thereof. The technical scheme is as follows: 78-93 wt% of magnesia particles, 0.1-2 wt% of organic additives and 5-20 wt% of absolute ethyl alcohol are placed in a stirrer, stirred for 2-6 hours at a rotating speed of 300-600 rpm, dried at 80-110 deg c for 12-24 hours, and sieved to obtain pretreated magnesia particles with a particle size of 1-5 mm. Then, 63-75 wt% of the pretreated magnesia particles, 20-32 wt% of magnesia fine powder, 2-5 wt% of flake graphite, 1-3 wt% of an antioxidant and 2-5 wt% of thermosetting phenolic resin are used as raw materials to be uniformly mixed, pressed and molded at 150-200 MPa, and then cured at 180-240 deg c for 18-24 hours to prepare the low-carbon magnesia carbon brick. The invention has the characteristics of low production cost, simple process and easy industrial production, and the prepared low-carbon magnesia carbon brick has high thermal shock stability, high high-temperature bending strength and good slag erosion resistance.

The invention discloses a corrosion-resistant magnesium-aluminum honeycomb ceramic heat accumulator and a preparation method thereof, and the corrosion-resistant magnesium-aluminum honeycomb ceramic heat accumulator characterized by being prepared mainly from the following components: 20-30 parts of silica, 20-30 parts of titanium dioxide, 10 to 20 parts of dense fused corundum fine powder, 5 to 10 parts of iron oxide, 5 to 15 parts of chrome oxide green micro powder, 5 to 15 parts of chrome ore powder of 0.1 to 1 mm, 2 to 4 parts of aluminate cement, 1 to 3 parts of silicon micropowder, 3 to6 parts of chlorinated polyethylene, 3 to 5 parts of maleic acid-acrylic acid copolymer, 10 to 12 parts of hydroxypropyl methylcellulose, 2 to 3 parts of phthalic acid ester, 2 to 3 parts of monoethanolamine and 1-3 parts of stearic acid by stirring, casting molding, drying and calcining. The corrosion-resistant magnesium-aluminum honeycomb ceramic heat accumulator has a large viscosity coefficient and extrusion pressure lower than that of other mud systems, and has little wear on equipment. At the same time, the corrosion-resistant magnesium-aluminum honeycomb ceramic heat accumulator has good drying properties and does not crack in the air for two hours.

The invention discloses a refractory castable for a converter sublance. The refractory castable comprises the following components in percentage by mass: 50-55wt% of mullite particles; 17 to 22 wt% ofcordierite particles; 17 to 22 weight percent of mullite fine powder; 3-7 wt% of calcium aluminate cement; 1-3 wt% of elemental Si powder; 7 to 10 weight percent of alpha-Al2O3 micro powder; and water accounting for 4.5-5.5 wt% of said components. The invention has the characteristics of low cost and simple process; the prepared refractory castable for the converter sublance is high in volume density, high in normal-temperature strength, excellent in thermal shock resistance and good in slag corrosion resistance.

The invention discloses microcrystalline graphite powder for a carbonic refractory material and a preparing method of the microcrystalline graphite powder. The preparing method comprises the preparing steps that firstly, 5-35wt% of phenolic resin is dissolved into 10-35wt% of alcohol, 40-80wt% of microcrystalline graphite is added, magnetic stirring is conducted for 2-10 minutes, and paste is obtained; secondly, the paste is put into an oven to be processed for 8-24 hours at the medium and low temperature, and a cured product is obtained after cooling; thirdly, the cured product is subjected to ball milling and then passes through a 325-mesh screen, and ball-milled powder is obtained; fourthly, the ball-milled powder is subjected to high-temperature carbonization for 1-4 hours under the condition of isolated air, and the microcrystalline graphite powder for the carbonic refractory material is obtained after cooling. The microcrystalline graphite powder is simple in technology and low in cost, the utilization rate of the microcrystalline graphite is increased, the added value of the product is increased, and the dilemma of resource exhaustion of crystalline flake graphite is relieved; in addition, the carbonic refractory material produced through the microcrystalline graphite powder prepared through the method has the good thermal shock stability and slag corrosion resisting performance, and can meet the use requirement.