120results about How to "Good slag resistance" patented technology

The invention relates to waterless stemming and a preparation method thereof. The waterless stemming is a fireproof, corrosion-resistant, washing-resistant and wear-resistant material for blocking an iron notch and filling iron notch gaps and cracks having various shapes. The waterless stemming has the advantages that 1, the waterless stemming does not yellow, does not produce black smoke, reduces benzpyrene content to a value less than 0.01% and has good filling performances, contractibility and sintering properties, 2, strength is high and stable blast furnace conditions are kept, 3, iron is produced stably, the iron notch can be opened easily, the pore is not broadened, melt iron flow and flow velocity can be effectively controlled, and strong slag resistance, erosion resistance and washing resistance are obtained, 4, the hearth is protected, crack is not produced in fast heating and high bonding strength of novel and old stemming is high, 5, opening performances are good and a boring process can be carried out easily by a tapping machine drill bit, 6, plasticity is good and clay gun operation and iron notch mud drum formation are convenient, and 7, a certain micro-expansion performance is obtained at a high temperature, gas permeability is good, strength is high and molten iron seepage caused by stemming contraction is avoided.

The invention discloses an aluminum/zinc composite ultralow-carbon alumina-magnesite carbon brick for a ladle lining. The aluminum/zinc composite ultralow-carbon alumina-magnesite carbon brick is made by the following steps of: mixing raw materials, aging, molding, carrying out heat treatment at 180-250 DEG C and curing for 16-36 hours. The aluminum/zinc composite ultralow-carbon alumina-magnesite carbon brick comprises the following raw materials in percentage by weight: 40-60% of magnesite granule, 5-15% of magnesia alumina spinel granule, 25-35% of magnesite fine powder, 3-8% of aluminum/zinc metallic composite powder, 0-1% of crystalline flake graphite, 0.5-2% of boracic antioxidant and 3-4% of organic bond. The volume density of the aluminum/zinc composite ultralow-carbon alumina-magnesite carbon brick is greater than or equal to 3.0g/cm<3>, the apparent porosity is not more than 5%, the cold compressive strength is not lower than 45 MPa, the carbon-embedded high-temperature folding strength at 1400 DEG C is not lower than 25MPa, the content of MgO is not less than 75%, and the carbon content is not more than 2%.

The invention provides a magnesia carbon brick and a preparation method thereof, belonging to the field of refractory materials. The raw materials of the magnesia carbon brick include 30-80 parts of waste magnesia carbon brick grains, 3-40 parts of magnesia grains, 6-12 parts of graphite, 5-15 parts of magnesia powder, 3-15 parts of micro powder additives, 2.2-3.5 parts of organic bonds by weight. The preparation method is characterized by sorting, hydrating, drying and grinding the waste magnesia carbon bricks from the steel mills and then mulling the waste magnesia carbon brick grains with other raw materials, forming and carrying out heat treatment to prepare the magnesia carbon brick. The energy-saving and environment-friendly aluminium-magnesia carbon brick prepared by the invention has high compression strength, low porosity, good resistance to molten steel corrosion and service life reaching or exceeding the service lives of the traditional aluminium-magnesia carbon bricks. In the invention, the waste aluminium-magnesia carbon bricks are rationally utilized and consumption of the mineral resources is reduced.

The invention relates to a recycled magnesia carbon coating material with strong slag-corrosion resistance and an application thereof. The coating material is composed of the following materials by weight percentage: 10-15% of waste magnesia carbon brick regenerated granule material with the granularity of not less than 3mm and not more than 5 mm, 25-30% of waste magnesia carbon brick regenerated granule material with the granularity of not less than 1 and not more than 3 mm, 30-35% of magnesite clinker with the granularity of not less than 0.083 mm and not more than 1 mm, 10-12% of fused magnesite micro powder with the granularity of less than or equal to 0.047mm, 3-5% of alpha-Al2O3 micro powder with the granularity of less than or equal to 0.047 mm, 3.5-5% of alumina-magnesia spinel micro powder with the granularity of less than or equal to 0.047 mm, 3.5-4.0% of soft clay, 1.5-2.5% of silica powder, 0.2-0.5% of sodium tripolyphosphate, 0.5-1.0% of metal silicon powder with the granularity of less than or equal to 0.074 mm, 0.7-1.2% of silicon carbide powder with the granularity of less than or equal to 0.074 mm, and 0.1-0.3% of refractory fiber. The recycled magnesia carbon coating material with strong slag-corrosion resistance, provided by the invention, is good in slag-corrosion resistance and long in service life, the problems of penetration of steel in the recycled magnesia carbon coating material, the penetration of steel between the upper nozzle and the brick cup, the high cladding temperature of the tundish and the bad disassembly performance are solved, the single packet pouring time is increased by 6h or above and the cladding temperature of the tundish is reduced by 60 DEG C or above.

The invention belongs to the technical field of refractory materials, in particular to a high-alumina refractory castable and a preparation method thereof. The high-alumina refractory castable is prepared from the following raw materials in parts by weight: 50-70 parts of high bauxite, 8-13 parts of andalusite, 11-23 parts of floating bead, 15-20 parts of silicon carbide, 10-15 parts of silicon nitride, 7-12 parts of alpha-Al2O3 micro powder, 3-9 parts of silica-alumina colloid powder, 1-5 parts of attapulgite clay, 10-25 parts of calcium aluminate cement, water reducer and aluminium silicatefiber, wherein the water reducer occupies 0.1-0.3% of total mass of the above raw materials, and the aluminium silicate fiber occupies 0.05-0.12% of total mass of the above raw materials. The high-alumina refractory castable has the advantages of high Al2O3 content, light weight, low heat conductivity and high castable strength.

The present invention relates to one kind of slide board refractory containing titanium carbonitride and its preparation process. The slide board refractory is prepared with alumina 75-90 wt%, magnesia 0-10 wt%, zirconium oxide 0-15 wt%, titanium carbonitride 0.5-30 wt%, boron carbide 0- 5 wt%, silicon carbide 0-5 wt%, metal aluminum 0-6 wt%, metal silicon 0-6 wt%, graphite 4-10 wt%, and organic binding agent 2-6 wt%, and through mixing, forming, and heat treatment at 100-300 deg.C or sintering at 1100-1500 deg.C. The slide board refractory of the present invention has the features of high antioxidant effect, high strength at high temperature, high slagging resistance and high heat shock resistance.

The invention discloses a lining patching material of the iron-smelting blast furnace. The lining patching material is prepared from the following raw materials by weight percent: 50-70% of aluminum oxide powder with the purity of 88%, 2-5% of aluminum oxide powder with the purity of 95%, 15-25% of silicon carbide powder, 3-13% of mullite powder, 2-4% of activated alpha-A12O3 powder, 3-6% of purecalcium aluminate cement and 3-5% of silica micropowder. When used, the patching material is weighted according to the area and part of the lining to be parched, water is added to mix, and a spray-repair device is used to perform hot spray-repair to the lining of the blast furnace. The lining patching material of the invention has the advantage that mullite powder, silicon carbide powder, aluminum oxide powder and alpha-A12O3 powder are used as the aggregate and base material of the hot patching material of the blast furnace and pure calcium aluminate cement and silica micropowder are used asthe bonding agents, thus ensuring that the patching material has good fire resistance and slag resistance when the operating temperature is above 1400 DEG C; and the cost of the patching material andthe construction cost can be reduced, thus greatly reducing the maintenance cost of smelting enterprises for patching the blast furnace.

Refractory compositions and methods of forming articles therefrom are provided that include a plurality of aggregate particles and a binder intermixed with the aggregate particles. The binder composition includes sintered crystalline chromium metaphosphate or chromium-aluminum metaphosphate, or combinations of the two distributed in the binder. The provided compositions are free of chromium oxide yet exhibit excellent slag resistance and are easily disposed of.

The invention discloses an energy-saving rotary kiln and furnace lining fireproof brick building slurry. The energy-saving rotary kiln consists of a cylindrical steel body kiln shell, a plurality of high-temperature fireproof brick steel plate dies, and steel plate die supporting columns, high-temperature fireproof bricks and fireproof brick building slurry which are welded together, wherein the fireproof brick building slurry is high in filling property, contractibility and sintering performance. The intensity is high, and the furnace condition of a blast furnace can be kept stable (the depth of an iron notch, the fluctuation of the smelting time and the full-blast plugging rate), so that the yield of the blast furnace is increased; the slag resistance performance is high, and the energy-saving rotary kiln can resist corrosion and scouring; no crack is generated during quick heating, so that the combination strength is high; the energy-saving rotary kiln has certain contractibility under high temperature and is high in ventilation property and high in intensity, so that the phenomenon that the fireproof bricks are broken due to expansion in a high-temperature environment is avoided.

The invention relates to a refractory material, and in particular relates to a corundum-magnesium aluminate spinel refractory material which is prepared from raw materials, including corundum, magnesium aluminate spinel, fused magnesite and alpha-Al2O3 micro powder. The corundum-magnesium aluminate spinel refractory material is relatively high in refractoriness and strength, good in anti-erosion property, anti-stripping property and anti-slag property, good in thermal vibration stability and long in service life, thereby being a corundum-magnesium aluminate spinel refractory material with excellent quality.

The invention discloses a refractory brick of a ladle slag line. The refractory brick is prepared from the following raw materials in parts by weight: 24-26 parts of waste magnesia brick, 46-48 parts of fused magnesite, 1-2 parts of -20mesh graphite powder, 3-5 parts of -100mesh silicon carbide, 15-17 parts of -100mesh zirconium oxide, 6-8 parts of -150mesh fused millite, 8-10 parts of magnesite powder, 2-3 parts of asbestos fibers, 4-6 parts of Suzhou bentonite, 10-12 parts of zirconium boride, 1.5-2.5 parts of -200mesh boron nitride, 2.5-3.5 parts of -200mesh cerium oxide, 2-3 parts of asphalt powder, 1-2 parts of phenolic resin, 3-5 parts of sodium hexametaphosphate and 16-18 parts of water, wherein the waste magnesia brick of which the granularity is -20 mesh to +40 meshes accounts for 50%; the waste magnesia brick of which the granularity is -40 mesh to +100 meshes accounts for 25%; the waste magnesia brick of which the granularity is -100 mesh to +200 meshes accounts for 25%; the fused magnesite of which the granularity is -5 mesh to +18 meshes accounts for 35%; the fused magnesite of which the granularity is -18 mesh to +80 meshes accounts for 35%; and the fused magnesite of which the granularity is -80 mesh to +150 meshes accounts for 30%.

The invention relates to an anti-slag-adhesion spray coating, which comprises the following raw materials in weight percent: 10%-13% of bauxite granules in grain size of 0-1mm, 20%-24% of bauxite powder in grain size of 325-800 meshes, 13%-18% of silica powder in grain size of 280-325 meshes, 35%-45% of silica powder in grain size of 600-1000 meshes, 1.5%-2.5% of metal silicon powder in grain size of 180-260 meshes, 0.5%-3% of zirconium oxide in grain size of 325-400 meshes, 2%-5% of silicon carbide in grain size of 180-280 meshes, 1.5%-3% of silica powder, 0.2%-0.5% of sodium tripolyphosphate, 0.3%-0.5% of sodium hexametaphosphate and 35%-40% of water. The anti-slag-adhesion spray coating has an excellent anti-slag-adhesion effect, a slag pot and a slag ladle are free from slag adhesion and the service life of the slag pot and the slag ladle is greatly prolonged.

The invention discloses a light tundish working lining and a method for preparing the same. Ingredients for the light tundish working lining comprise waste magnesia-carbon bricks, magnesite tailing, aluminum oxide, fibers, compound bonding agents and additives. The method for preparing the light tundish working lining includes dry vibration forming or wet smearing forming. The light tundish working lining and the method have the advantages that the light tundish working lining prepared by the aid of the method is low in volume density, erosion rate, cost and consumption and long in service life, energy can be saved, and the like. Besides, the problem of excessive consumption of resources of existing refractory raw materials (including waste magnesia-carbon brick reclaimed materials and thelike), the problems in the aspects of energy conservation and heat preservation and the like can be solved by the aid of the light tundish working lining and the method.

The invention discloses a preparation method of a slag line magnesia carbon brick for a steel ladle. The preparation method comprises the following steps: (1) placing 28-32 parts of 5-20-mesh low-silicon fused magnesia, 22-26 parts of 20-50-mesh low-silicon fused magnesia, 8-12 parts of 50-200-mesh low-silicon fused magnesia and 1-3 parts of -200-mesh low-silicon fused magnesia into a mixing machine to mix for 30-40min; (2) then, adding 0.8-1.2 parts of -20-mesh graphite powder, 1-2 parts of -100-mesh zinc powder, 1-2 parts of -100-mesh aluminum powder, 0.5-1 part of -200-mesh borne nitride, 0.5-1 part of -200-mesh boron carbide, 1-2 parts of -200-mesh cerium oxide and 0.5-1.5 parts of asphalt powder to mix for 60-90min; (3) next, adding 3.5-4.5 parts of phenolic resin to remix for 60-90min; (4) forming by using a press and drying a green brick at the temperature of 200 DEG C for 24h.

The invention belongs to the field of refractory materials for smelting reduction iron smelting and provides an Al2O3-Cr2O3 refractory material for a smelting reduction iron smelting furnace. The Al2O3-Cr2O3 refractory material for the smelting reduction iron smelting furnace comprises the following raw material components in percentage by mass: 60-70% of aggregate and 30-40% of matrix; content of Cr2O3 in the Al2O3-Cr2O3 refractory material is 30-55%; the aggregate comprises alumina-chrome particles and a zirconium-containing raw material; the zirconium-containing raw material is one of zirconium mullite particles and zirconite particles or combination of the two particles; addition amount of zirconium mullite and zirconite is 2-15% of the total mass of the raw material; the matrix is fine powder and micro powder, the fine powder comprises chromium oxide green and alumina-chrome fine powder; and the micro powder is zirconia micro powder and sintered alumina micro powder or activated alumina micro powder. The Al2O3-Cr2O3 refractory material for the smelting reduction iron smelting furnace has the advantages that thermal shock resistance of the material is effectively improved while guaranteeing excellent sintering effect and slag resistance of the material and operation cost is saved.

The invention provides a furnace bottom structure for a rotary hearth furnace. The furnace bottom structure comprises a heat preserving layer, a heating layer and an anti-slag-corrosion heat transfer layer in sequence from bottom to top, wherein the heat preserving layer and the heating layer are fixed; the anti-slag-corrosion heat transfer layer can rotate relative to the heat preserving layer and the heating layer; resistance wires are buried in the heating layer; the inside of the rotary hearth furnace is partitioned into a plurality of regions; the quantity of the resistance wires in the heating layer correspondsing to each region is set in advance; a layer of second steel plate is fixed on the upper part of the heating layer; a layer of first steel plate is fixed on the lower part of the anti-slag-corrosion heat transfer layer; a certain gap is kept between the first steel plate and the second steel plate, so that radiation heat transfer can be realized, and friction is prevented. By adopting the furnace bottom structure for the rotary hearth furnace provided by the invention, effective heat transfer and rapid reduction of a deep bed in a reduction process can be realized.

The invention relates to a magnesium-silicon hydrate binding agent based on salt lake brine and a preparation method of the magnesium-silicon hydrate binding agent. The binding agent adopts a technical scheme as follows: firstly, a silicate solution in a molar concentration ratio of magnesium ion to silicon ion being (0.6-2.0):1 is added to the salt lake brine and stirred uniformly, and a mixed solution is obtained; then, the mixed solution is left to stand for 10-91 hours at 25-90 DEG C, washed and subjected to suction filtration, and a solid product and a filtrate are obtained respectively;next, the solid product is dried at 45-120 DEG C and ground, and the magnesium-silicon hydrate binding agent based on the salt lake brine is prepared. The filtrate is evaporated and crystallized, andone or two by-products of potassium chloride, sodium chloride and lithium carbonate is or are obtained. The method has the characteristics of being simple in process, high in yield, safe, environmentally friendly and short in period; the prepared magnesium-silicon hydrate binding agent based on the salt lake brine has high purity, excellent thermal stability and good use effect, and can be widelyused in the fields of magnesium refractory castables, environment-friendly concrete building materials and the like.

The invention relates to a preparation method of a MgO-C castable, comprising the following steps of: using granulation flake graphite as a carbon source, adding an appropriate additive, uniformly dispersing graphite in a castable, and unconspicuously increasing the amount of water for stirring the castable to finally obtain the MgO-C castable with high carbon content (3.0-7.3 wt%), high strength, uniform and compact structure and excellent slag resistance. The raw materials used contain: by weight, a fused magnesia aggregate consisting of 14-22 parts of an aggregate 5-3mm, 10-20 parts of an aggregate 3-1mm and 12-16 parts of an aggregate 1-0.088mm; 29-33 parts of a fused magnesia fine powder with its particle size being less than 0.088mm; 10-18 parts of granulation graphite; 2-5 parts ofsilicon ash; and an additional additive consisting of 0.7-2.0 parts of an antioxidant, 0.1-0.7 part of a wetting agent and 0.1-0.3 part of a dispersant.