155results about How to "Improve slag erosion resistance" patented technology

The invention relates to an Al2O3-SiC-C castable material for a slag line of a main trough of a large blast furnace and a preparation method thereof. The castable material comprises an aggregate, a matrix, a bonding agent, an antioxidant and an admixture; wherein, the aggregate comprises corundum grains and carborundum grains; the matrix comprises ball pitch, flake graphite, corundum fine powder, a-Al2O3 ultrafine powder, silicon powder and carborundum ultrafine powder; the bonding agent is aluminate cement; the antioxidant is a compound of aluminium powder and silicon powder; the admixture comprises a water reducing agent and a detonation suppressor. The castable material is prepared by the steps of mixing various raw materials evenly, adding water, stirring, casting molding, maintaining and drying. The castable material has strong anti-slag corrosion and anti-scour capabilities, good high temperature resistance, abrasion resistance and thermal shock resistance, slight reheating change and long service life.

The invention relates to a magnesium-zirconium brick with high erosion resistance and thermal shock resistance for an RH furnace and a production technology thereof. The brick comprises the following components by weight percent: 76-90% of MgO and 5-21% of ZrO2; and the firing temperature of the brick is 1680-1840 DEG C. The production technology comprises the following steps: pretreating magnesia and zirconia, synthesizing the magnesia and zirconia into magnesium-zirconium sand; crushing synthesized magnesium-zirconium sand and fused magnesia to 5-3mm, 3-1mm and 1-0mm particles; homogenizing under strong force and mixing the granular materials, 150-200 mesh magnesia and magnesium-zirconium sand powder, 200-250 mesh zirconia powder, additives CaO and Y2O3 and binder paper pulp water liquid and performing compression moulding; baking at 120 DEG C for 24-72 hours; and heating to 1680-1840 DEG C and maintaining the temperature for 3-5 hours. The linear change of the finished brick is within the range of +/-0.5%; and after being baked, the brick has no surface chap defect caused by the phase change of zirconia and has excellent refinery cinder erosion resistance and thermal shock resistance.

The invention relates to an amorphous refractory; especially to an erosion resistance concast intermedium finish-go-home work sark. It uses magnetite as main raw material and the light-burned magnesium oxide, boric acid, silicon powder and aluminum powder as accelerator and the resin, starch gum and so on as insurance contract. It adds one or some kinds of chrome green, compound chrome-magnesite brick, magnesite-chrome brick. The raw material is that (wt%): the magnesite 5-1mm is 10-35%, 1-0.2mm is 10-35%, <=0.074mm is 20-40%, <=0.088mm admixture is 5-20%, <=0.088mm accelerator is 1-5%, starch gum is 5-12%. Each raw material has a certain quality technology index.

A lining material of tundish for conticasting contains magnesium sand (80-95 wt.%), alumina (1-10 wt.%), soft clay (1-5 wt.%) and thermoplastic organic compound (2-15 wt.%). Its advantages are high strnegth, anticorrosion power, and high conticasting productivity.

The refractory sialon corundum brick material for blast furnace is prepared with corundum grain and powder 60-75 wt%, metal silicon powder 5-12 wt%, metal aluminum powder 10-15 wt%, titania powder 1-8 wt%, alumina powder 3-9 wt%, silica powder 0-2 wt%, clay 0-2 wt% temporary paper pulp or phnolic resin binding agent 2-5 wt%, and through mixing, forming, drying, sintering at nitrogen atmosphere. The refractory sialon corundum brick material has excellent alkali resistance, excellent slag resistance, high heat shock stability, high wear resistance and excellent molten iron fuse loss resistance. The refractory sialon corundum brick material may be used widely for large and medium sized blast furnaces.

The invention provides a slag-corrosion-resistant magnesite-spinel brick and a preparation method thereof and relates to a slag-corrosion-resistant magnesite-spinel brick. The slag-corrosion-resistant magnesite-spinel brick is prepared from, by mass, 61-81% of fused magnesite particles and fine powder, 0-8% of magnesium aluminate spinel particles, 3-10% of magnesium aluminate spinel fine powder, 2-8% of aluminum powder, 0.5-3% of titanium dioxide, 0.5-10% of zirconium oxide fine powder and 0.1-0.5% of yttrium oxide powder. The slag-corrosion-resistant magnesite-spinel brick is obtained through the steps of material preparation, premixing of materials, mixing of the materials and forming. Slag corrosion resistance, high-temperature oxidation resistance and compactness of the magnesite-spinel brick are improved, and accordingly the aim of prolonging the service life of the magnesite-spinel brick is achieved.

The invention discloses a continuous casting monolithic stopper and a method of manufacture thereof.The monolithic stopper comprises a stopper body, a steel core inserted into the stopper body and a head connected to the lower end of the stopper body, the surface of the steel core is provided with an anchor, the surface of the monolithic stopper is coated with Al2O3 coating; the stopper body is made by casting castables comprising mullite, the head is made by casting castables comprising corundum and sintered mullite, and the monolithic stopper is manufactured by monolithic casting.The stopper obtained herein is good in monolithicity, is free of brick joint and head shedding problems of sleeve brick stoppers, has good thermal shock resistance, high strength and good resistance to molten steel scour erosion, is simple to manufacture and low in cost, and is suitable for stopping a tundish nozzle under low continuous casting, high-oxygen steel continuous casting and skid flow control.

A spinel refractory pouring material containing a poor cement quality function is one kind of refractory. According to the invention, the material contains spinel 40-65%, white corundum 15-40%, activated alumina 3-15%, crystal materials of magnesium and zirconium 0.5-8%, cement 2-5%, adjunct 0.01~4.7%,water 3-7%. There is no Cr in such kind of pouring material, so it can not cause any environmental pollution problem. The material also has a favorable anti-heating and shocking performance due to the use of the eutectic material of magnesium and zirconium.

The invention relates to a nanometer composite oxide ceramics binding aluminium-spinel fireproof casting material and a manufacturing method thereof. The composition of ingredients thereof is that various grades of special-class bauxite clinker, brown fused alumina, secondary white fused alumina, white fused alumina and aluminum-magnesium spinel are adopted as skeletal material; and the base material comprises plate-shaped corundum powder, calcinatory alpha-Al2O3 powder, active Al2O3 powder, aluminum-magnesium spinel powder, pure calcium aluminate cement, nanometer Al2O3-MgO composite ceramics binding agent hydrate colloid suspension bonding agent as well as various addition agents. The ingredients are mixed and stirred for making the nanometer Al2O3-MgO composite ceramics binding aluminium-spinel fireproof casting material. The fireproof casting material of the invention has excellent microstructure and mechanics performance, and also has the performances such as special slag corrosion resistance, stability of high temperature structure and high temperature resistance, and the like, is used in the entirely casting LF finery, and the service life thereof is prolonged obviously, and the development demands for effective operation of secondary refining equipment, thus providing the best service for the steal industry.

The invention discloses a magnesia-carbon brick for a steelmaking converter and a steel ladle and a production method of the magnesia-carbon brick. The magnesia-carbon brick is prepared from the raw materials in percentage by weight: 72-83 percent of sintered magnesia, 3-15 percent of graphite grain, 1-15 percent of antioxidant and 2-5 percent of binder. The preparation method comprises the steps: (1) carrying out mechanical crushing on massive magnesia, then sending the crushed massive magnesia into a ball mill, and carrying out fine grinding on the crushed massive magnesia to prepare the magnesia in five specifications; and (2) carrying out burdening according to the required weight percentage, sending the burdened materials into a mixer to carry out mulling, adding coarse-grained magnesia, a thermosetting phenol-formaldehyde resin binder, the graphite grains and a mixed powder of fine-grained magnesia and the antioxidant into the mixer sequentially, carrying out material mixing for more than 25 minutes, and carrying out processing forming finally. According to the magnesia-carbon brick and the production method disclosed by the invention, as the graphite grains are adopted to replace crystalline flake graphite, the material yield is increased, and the spalling resistance and the structure spalling resistance of the materials are improved.

The invention relates to a magnesia carbon brick and a preparation method thereof. The magnesia carbon brick is prepared from, by weight, 60%-75% of fused magnesite particles, 10%-30% of fused magnesite fine powder, 5%-10% of carbon, 1%-5% of an antioxidant, 1%-3% of a binding agent and 0.4%-1% of furfural waste liquid. In the preparation process, the fused magnesite particles are placed in a mixing mill to be dry-mixed for 2-15 min, then phenolic resin and the furfural waste liquid are added to continue to be mixed for 5-15 min, then carbon is added to the mixture, mixing is carried out for 5-15 min, finally the fused magnesite fine powder and the antioxidant are added to continue to be mixed for 8-15 min, pug is formed, the rotating speed of the mixing mill is set to range from 950 r/min to 1,000 r/min, mixing time ranges from 10 min to 60 min, and the magnesia carbon brick is prepared after compression moulding and drying solidification. The preparation method is simple, the steps are easy to operate, the uniformity of mixed materials of the magnesia carbon brick is improved, the quality of the mixed materials of the magnesia carbon brick is improved, the labor intensity of workers is lowered, the use amount of phenolic resin is reduced, and due to the addition of the furfural waste liquid, the material mixing process is more even, and phenolic resin is prevented from being caked.

The invention discloses a storage iron runner castbale produced by adopting a waste iron runner material. The storage iron runner castable comprises the following components in parts by mass: 15-20 parts of waste iron runner material, 20-30 parts of brown fused alumina particles, 3-5 parts of brown fused alumina fine powder, 5-10 parts of electric smelting compact corundum particles, 2-5 parts of electric smelting compact corundum fine powder, 3-5 parts of magnesia-alumina spinel, 10-20 parts of silicon carbide, 2-5 parts of silicon powder, 1-2 parts of activated aluminum oxide micro powder, 4-6 parts of crystalline flake graphite, 0.5-1 part of a silane coupling agent, 3-8 parts of aluminate cement, 1-4 parts of a compound water reducer, 1-2 parts of a compound antidetonant, and 1-2 parts of an antioxidant. The storage iron runner castable makes full use of the waste material, thus greatly lowering comprehensive cost; due to the materials of the different particle sizes, the construction efficiency is improved; for the addition of the crystalline flake graphite and magnesia-alumina spinel powder, the molding density of the castable is improved, the castable is promoted in sintering, and the density, strength, volume stability and residue resistance of the castable are improved.

The invention relates to a carbon-free unburned brick and a production method thereof, belonging to the field of inorganic materials. The invention aims to provide the carbon-free unburned brick with longer service life. The carbon-free unburned brick is prepared by the following raw materials in parts by weight: 60-80 parts of refractory aggregates, 13-32 parts of refractory powder, 7-15 parts of active alpha-Al2O3 powder and a proper quantity of bonding agents, wherein the refractory aggregates are corundum; the refractory powder is the mixture of 3-7 parts of magnesia powder and 10-25 parts of corundum powder; and the bonding agents are MgCl2 solution. Compared with the existing products, the carbon-free unburned brick has higher compression strength and bulk density, reduces the porosity and improves the integral use stability and corrosion resistance to slag of the products, thereby prolonging the service lives of the products.

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 preparation method of a dispersion type gas permeable brick for ladle, and belongs to the technical field of refractory materials. The preparation method comprises the following steps: mixing a corundum mixture with zirconia powder, adding an additive, a dispersant, and water, stirring and mixing to obtain a mixture; transferring the mixture to a mould, carrying out vibration moulding to obtain a blank; curing the blank at a constant temperature in the absence of light, removing the mould, burning the blank in a calcining furnace, cooling the blank to a room temperature, transferring the blank to a sintering furnace, sintering the blank under the protection of argon, cooling to a room temperature, performing discharging to obtain a primarily sintered gas permeablebrick; processing the primarily sintered gas permeable brick by a processing liquid, delivering the primarily sintered gas permeable brick to a sintering furnace, carrying out low temperature carbonization under the protection of nitrogen, then performing high temperature sintering to obtain secondarily sintered gas permeable brick; mixing the secondarily sintered gas permeable brick with water,introducing carbon dioxide into water, soaking, filtering, and drying to obtain the dispersion type gas permeable brick for ladle. The prepared gas permeable brick has an excellent performance on resisting slag corrosion and thermal shock, and the breathability and mechanical properties are also very good.

The invention discloses anti-erosion magnesia-carbon bricks. The magnesia-carbon bricks are prepared from the following ingredients in parts by weight: 65-70 parts of magnesia, 3-5 parts of basalt granules, 0.25-0.5 part of nano zirconium boride, 1-3 parts of nickel citrate, 1-3 parts of copper sulfate pentahydrate, 0.3-0.5 part of hexamethylene tetramine, 15-18 parts of graphite, 3-5 parts of ceramic granules Al4SiC4 and 3-5 parts of binder. According to the anti-erosion magnesia-carbon bricks, the proportioning of the magnesia-carbon bricks is subjected to optimization and improvement, particularly, the basalt granules, the nano zirconium boride, the nickel citrate, the copper sulfate pentahydrate and the ceramic granules Al4SiC4 are added, and all the ingredients are synergistic mutually, so that the quality of the bricks is high, the carbon loss can be greatly lowered, the spalling of the bricks is avoided, the slag erosion resistance of the magnesia-carbon bricks is improved obviously, and the service lives of the magnesia-carbon bricks are prolonged. The invention further discloses a preparation method for the anti-erosion magnesia-carbon bricks. The preparation method is simple in processing steps and high in operability, has low requirements on equipment and is applicable to large-batch industrial production.

The invention discloses a magnesia-zirconia eutectic side hole material for a submersed nozzle. The magnesia-zirconia eutectic side hole material is prepared from the raw materials of magnesia-zirconia powder, graphite powder, fused silica powder, monatomic silicon powder, silicon carbide powder, boron carbide powder, powdered resin and liquid resin, wherein the granularity of the magnesia-zirconia powder is not greater than 1mm; the magnesia-zirconia powder is prepared from 94 to 98 percent of MgO and 2 to 6 percent of ZrO2; the granularity of the graphite powder is not greater than 100 meshes. The magnesia-zirconia eutectic side hole material provided by the invention has relatively high resistance to oxidation, high thermal shock resistance, high anti-erosion property and resistance to slag corrosion; the submersed nozzle made of the magnesia-zirconia eutectic side hole material has high mechanical strength, the service life of the submersed nozzle can be prolonged greatly, and the continuous steel casting operation efficiency is increased; meanwhile, a tire cord steel billet is prevented from being broken easily in a wire drawing process of a produced tire cord steel billet, and the phenomena of impurity adhesion and blockage on the inner wall of the submersed nozzle can be prevented effectively.

The invention relates to a dry material and a preparation method and application thereof. The dry material is mainly prepared from, by weight, 60-75 parts of waste magnesium-carbon particles, 15-30 magnesium sand, 3-6 parts of carbohydrate binding agent, 1-2 parts of sintering aids, 2-5 parts of Al4SiC4 powder and 0-1 part of other antioxidant. The dry material has the advantages of resisting oxidation and erosion and being low in cost and environmentally friendly. According to the preparation method, the dry material can be obtained through simple mixing processes, and therefore the method has the advantages of being simple to operate and providing more convenience for large-scale production. By applying the dry material, the service life of tundishes can be effectively prolonged, waste and costs are reduced, and meanwhile no pollution is caused to environment, and therefore the dry material has significant economic benefits and environmental protection benefits.

The invention discloses a boron nitride reinforced iron runner material. The iron runner material with good properties is prepared from raw materials such as brown alumina, silicon carbide, silica micropowder, hexagonal boron nitride, Si micropowder and graphite. According to the iron runner material, after boron nitride is added, under high-temperature circumstances, boron nitride has a graphitoid layered structure, and layers are bonded by relatively weak molecular bonds, so that the interface bonding of boron nitride and SiC is relatively weak, the thermal expansion coefficient of the material is relatively small, the deformation of the material under high-temperature conditions is lowered, and the thermal shock resistance of the material is improved; and on the other hand, hexagonal boron nitride has non-wetting property to slag melt and is oxidated at the temperature of 900 DEG C so as to produce boron oxide, boron oxide reacts with alumina in the material so as to produce aluminum borate, aluminum borate is subjected to volume expansion and forms a dense layer, protective oxidation occurs, and the slag erosion resistance of the material is enhanced. According to the boron nitride reinforced iron runner material, the slag erosion resistance and thermal shock resistance of the iron runner material can be remarkably improved, the chemical erosion resistance is high, the thermal shock stability is good, and the service life is long.

The invention discloses a continuous-casting flow-control refractory material and application thereof. The continuous-casting flow-control refractory material comprises the following components in parts by weight: 24-30 parts of white alundum, 29-35 parts of brown fused alumina, 9-11 parts of electrofused zirconium mullite, 18-22 parts of zirconium dioxide, 3-5 parts of active aluminum oxide, 4-6 parts of flake graphite, 0.5-1.5 parts of silicon carbide and 5-7 parts of binder. The high strength, high-temperature erosion resistance, high-temperature wear resistance, peel resistance and other requirements of the continuous-casting flow-control refractory material are ensured, and the flow control time can be further prolonged. The continuous-casting flow-control refractory material is especially suitable to be used as continuous-casting flow-control functional components of long nozzles and bowl parts thereof, brick cups and bowl parts thereof, and the like.

The invention relates to a rare earth reinforced corundum silicon carbide castable and a preparation method thereof. The rare earth reinforced corundum silicon carbide castable comprises, by weight, 55-75% of corundum aggregates, 10-15% of silicon carbide, 2-5% of rare earth oxides, 1-5% of metallic silicon, 6-12% of binder and 5-7% of an additive; and the rare earth oxides include La2O3 and Y2O3. The rare earth oxides containing La2O3 and Y2O have a strong bonding performance to form microstructure welding, have a synchronous enhancement function, have good thermal shock stability and oxidation resistance, and react at a high temperature to generate LaOF, so the slag erosion resistance is improved; and the rare earth oxides have good acid and alkali resistance, and strong erosion resistance, so the service life is prolonged. Compared with the prior art adopting chromium oxide, the preparation method adopting the rare earth oxides has the advantages of prolongation of the service life, and avoiding of secondary pollution.

The invention provides a light-weight refractory castable for a blast furnace swing chute. The light-weight refractory castable comprises the following components in parts by weight: 50-65 parts of microporous corundum particles, 10-15 parts of corundum particles, 10-15 parts of silicon carbide, 1-3 parts of cement, 1-3 parts of silica powder, 1-3 parts of carbon black, 6-10 parts of activated alumina micro powder, 1-3 parts of an antioxidant, 1-3 parts of a composite anti-explosion agent and 0.1-0.3 parts of a water reducing agent. The microporous corundum particles, the corundum particles, the silicon carbide, the cement, the silica powder, the carbon black, the activated alumina micro powder, the antioxidant, the composite anti-explosion agent and the water reducing agent are put into a stirrer and stirred for 10-15 min, and the light-weight refractory castable for the blast furnace swing chute is obtained after uniform mixing. The obtained light-weight refractory castable product for the blast furnace swing chute is small in volume density, low in apparent porosity, high in closed porosity, small in heat conductivity coefficient and high in slag erosion resistance.

The invention discloses a slag anti-adhesion coating for a hot metal ladle. The slag anti-adhesion coating consists of the following components in percentages by weight: 35-70wt% of carbonaceous fireproof waste brick A-level materials, 10-35wt% of waste high-aluminum brick materials, 5-30wt% of black silicon carbide, 3-8wt% of aluminous cement, 3-8wt% of Guangxi white clay, 0.1-2wt% of carboxymethyl cellulose sodium, 0.1-1wt% of sodium tripolyphosphate, 0.1-1wt% of organic explosion-proof fibers, and 0.01-1wt% of quick lime. According to the slag anti-adhesion coating for the hot metal ladle disclosed by the invention, the preparation process is simple; besides, in the construction project of slag anti-adhesion treatment for the hot metal ladle, the slag anti-adhesion coating has the characteristics of being simple in construction, excellent in slag anti-adhesion property, high in sintering intensity, low in cost and the like, and is obvious in economic benefit and social benefit.

The invention relates to a copper smelting converter tuyere brick and a preparation method thereof. According to the technical scheme, 60-65wt% of fused magnesite chrome particles serve as aggregate, and 15-20wt% of fused magnesite fine powder, 11-16wt% of Cr7C3 fine powder, 4-7wt% of zirconia micro powder and 1-3wt% of yttria micro powder serve as matrix materials; the matrix materials are evenly mixed according to the contents of the aggregate and the matrix materials and then added into the aggregate, and the matrix materials and the aggregate are evenly mixed; then, zirconia sol accounting for 8-10wt% of the sum of the matrix materials and the aggregate is added and evenly mixed, forming is carried out, and the mixture is cured for 12-24 h at 25-30 DEG C and dried for 12-18 h at 110-120 DEG C; finally, the mixture is put into a muffle and heated to 1550-1580 DEG C at the heating rate of 4-5 DEG C/min, heat preservation is carried out for 2-3 h, furnace cooling is carried out, and the copper smelting converter tuyere brick is obtained. The process is simple; the prepared copper smelting converter tuyere brick is large in strength, high in slag corrosion resistance, excellent in thermal shock resistance and good in volume stability.