125results about How to "Strong resistance to slag erosion" patented technology

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 a micro closed-cell light-weight corundum refractory aggregate and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: by using 45-65 wt% of gamma-Al2O3 fine powder, 30-50 wt% of alpha-Al2O3 micropowder and 1-10 wt% of nano aluminum oxide micropowder as raw materials, adding water accounting for 40-80 wt% of the raw materials, and carrying out wet milling with a planet ball mill for 0.5-3 hours; putting the slurry subjected to wet milling in a mold, standing at room temperature for 12-24 hours, and stripping; and drying at 110-200 DEG C for 12-36 hours, and keeping the temperature at 1750-1900 DEG C for 1-8 hours to obtain the micro closed-cell light-weight corundum refractory aggregate. The micro closed-cell light-weight corundum refractory aggregate has the characteristics of low apparent porosity, high closed porosity, low volume density, small average pore size, lower heat conductivity and high molten slag erosion resistance.

The invention belongs to the technical field of a high-grade refractory matter for metallurgy, coloring, glass and cement kilns, and preparation thereof, and particularly relates to a modified high-purity magnesium aluminate spinel composite brick and a preparation method thereof. Aggregate is prepared from the following raw materials in parts by weight: 65 to 80 parts of high-purity magnesia and 15 to 35 parts of high-purity magnesium aluminate spinel; powder materials are prepared from the following raw materials in parts by weight: 1 to 5 parts of fused magnesia powder, 1 to 5 parts of fused magnesia-alumina spinel, 1 to 3 parts of fused magnesia-alumina spinel micro powder, 1 to 3 parts of desilicication zirconia, 1 to 3 parts of titanium oxide, 0.1 to 0.5 part of sintering agents, 1 to 3 parts of active aluminum oxide micro powder and 3 to 4 parts of combining agents. The modified high-purity magnesium aluminate spinel composite brick has the advantages that the purity is high; the density is great; the strength is high; the high-temperature thermal shock stability is good; the corrosion resistant performance is high; the molten metal resistant and antioxidation capability is high; no harmful gas is exhausted; green refractory material standards are conformed. The preparation method is simple; the cost is low; no carbon and no chrome are discharged; no pollution occurs; practical applicability is realized.

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 high-density ultrahigh-purity magnesia-calcium brick and a preparation method thereof. The high-density ultrahigh-purity magnesia-calcium brick is prepared from 9 to 16% of magnesia-calcium sand having particle sizes of 5-7mm, 9 to 16% of magnesia-calcium sand having particle sizes of 3-5mm, 9 to 16% of magnesia-calcium sand having particle sizes of 1-3mm, 13 to 32% of magnesia-calcium sand having particle sizes of 0.5-1mm, 5 to 25% of magnesia-calcium sand having particle sizes less than or equal to 0.5mm, 5 to 10% of high-purity magnesia sand fine powder having particle sizes less than or equal to 0.044mm, 2 to 5% of tar resin or paraffin, and 2 to 5% of fused zirconia. The preparation method comprises the following steps of raw material proportioning, raw material blending, mixing, molding, sintering, waxing and vacuum aluminium foil package. The high-density ultrahigh-purity magnesia-calcium brick has a high product compact degree and excellent hydration resistance. The high-density ultrahigh-purity magnesia-calcium brick has high purity and thus high slag corrosion resistance and high flushing resistance are obtained. Compared with other like products, the high-density ultrahigh-purity magnesia-calcium brick has better thermal shock resistance. The high-density ultrahigh-purity magnesia-calcium brick contains a large amount of dissociative CaO and thus the high-density ultrahigh-purity magnesia-calcium brick has excellent molten steel cleaning performances and is especially suitable for production of high cleanliness steel such as stainless steel.

The invention relates to ladle kerb casting material and a ladle kerb preparation method by the ladle kerb casting material. The casting material comprises the following components in weight percentage: 60-82% of ladle lining waste having a grain size of 1-8mm, 10-20% of bauxite grain size of 0.044-1mm, 2-10% of silicon dioxide superfine(less than or equal to 0.02mum), 5-10% of magnesium oxide fine powder grain size of 0.044-0.088 and 0.01-1% of sodium polyphosphate. The preparation method comprises ladle kerb lining waste selecting, crushing, mixing evenly and adding water while stirring, casting, maintaining, baking and the like. The waste ladle kerb casting material is recycled by the preparation method so that the production cost of the fireproof materials and the steel-making cost can be obviously reduced, the economic benefit is improved and the social meaning of protecting environment and saving energy can be realized; the ladle kerb prepared by the ladle kerb casting material has the advantages of good high-temperature volume stability, enough common/ medium/ high temperature strength, strong anti-slag corrosion and anti erosion-corrosion, thus satisfying the requirements for maintaining the normal running of the ladles.

The invention relates to a refractory matter, and particularly relates to an alumina-spinel-carbon brick containing aluminachrome slag and a preparation method of thee alumina-spinel-carbon brick. The alumina-spinel-carbon brick is prepared from the following raw materials in parts by weight: 50-65 parts of brown fused alumina particles with the particle sizes of smaller than or equal to 5mm, 5-20 parts of aluminachrome slag particles with the particle sizes of smaller than or equal to 3mm, 5-15 parts of 180-220meshbrown aluminum oxide powder, 5-10 parts of 180-220mesh aluminachrome slag powder, 6-15 parts of 180-220mesh fused magnesite powder, 0.3-1.0 part of 300-340mesh metal aluminum powder, 6-12 parts of graphite and 2-4 parts of a binding agent. The alumina-spinel-carbon brick provided by the invention is high in strength, stable in chemical property, and excellent in slag corrosion resistance; and the aluminachrome slag component is added, and reacts with magnesia powder at a high temperature, so as to form a spinel structure, so that the anti-erosion properties and slag resistance of the alumina-spinel-carbon brick are enhanced.

A rotor of rotary impeller of compositing graphite and ceramic belongs to the field of the purification treatment of aluminum melt. The invention comprises a graphite nozzle and a graphite-ceramic composite nozzle. The graphite nozzle is connected with the graphite-ceramic composite nozzle. The graphite-ceramic composite nozzle comprises two parts, and the internal part is a graphite tube which is covered with a ceramic bushing. The internal part of the graphite-ceramic composite nozzle is a through hole which is a gas channel. The graphite nozzle is equipped with a jet orifice for gas ejection. The ceramic material is silicon nitride bonded silicon carbide material, and the component and the weight percent are: 45 to 70 percent of silicon nitride and 30 to 55 percent of silicon powder. The ceramic material of the invention has the advantages of the good high temperature oxidation resistance, the good thermal shock resistance, the strong slag corrosion resistance, the high strength and the wear resistant, preventing from the erosion and oxidation of the graphite tube from aluminum liquid and air, thereby achieving the longer service life of the rotor of rotary impeller of compositing graphite and ceramic than that of the original rotor of rotary impeller with full graphite material.

The invention belongs to the technical fields of advanced fireproof materials for electric furnaces, converter linings and steel ladle linings and preparation thereof, and relates to an unfired alumina-magnesite carbon brick and a preparation method thereof. The unfired alumina-magnesite carbon brick is prepared from aggregate, powder, an additive and a binding agent in parts by weight: 60 to 70 parts of brown aluminum oxide and/or special alumina; 1 to 3 parts of magnesium aluminate spinel, 9 to 11 parts of high-purity magnesia, and 11 to 13 parts of sub-white corundum; 2 to 4 parts of the additive; 5 to 7 parts of graphite, 1 to 3 parts of high-temperature pitch, 0.2 to 0.5 part of rare earth oxide, 3 to 5 parts of a ceramic binding agent, 3 to 4 parts of a complexing magnalium grouting agent and 1 to 3 parts of water. The unfired alumina-magnesite carbon brick has the advantages that the preparation method is simple and safe, the cost is low, high-temperature firing is not needed, the density is large and the strength is high.

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.

The invention provides a production method of a chrome corundum-titanium brick. The production method comprises the steps of mixing chrome corundum materials with grain sizes of 5-3mm, 3-1mm, 1-0mm, 180 meshes and 325 meshes, adding phosphoric acid, stirring the materials uniformly, and putting the materials for not less than 24 hours; adding titanium dioxide or high titanium slag to the chrome corundum mixture subjected to ageing to be mixed, then adding lime and mixing the materials uniformly, thus obtaining a mixture; then adding aluminium dihydrogen phosphate to carry out mulling; carrying out compression molding and high-temperature firing, thus obtaining the chrome corundum-titanium brick. The production method has the advantages that the production method is simple in process, is low in cost, can improve the thermal shock stability of the product, and ensures a good slag corrosion resistance effect; calcium titanate is generated by adopting titanium oxide and calcium oxide at high temperature, the melting point is as high as 1850 DEG C, and the slag corrosion resistance capacity is strong; the thermal shock stability of the produced chrome corundum-titanium brick is not less than seven times, so that the chrome corundum-titanium brick can meet the using requirements of special parts of non-ferrous metallurgical furnaces.

The invention relates to a light-weight composite corundum refractory aggregate, and a preparation method for the light-weight composite corundum refractory aggregate. According to the technical scheme, the preparation method comprises the following steps: taking 80-95 wt% of gamma-Al2O3 fine powder, 1-10 wt% of Al(OH)3 micro powder, 1-10 wt% of a glycopolymer and 0.1-5 wt% of an antifreeze protein as raw materials, adding 20-60 wt% of water, and conducting wet grinding; pelleting slurry obtained after wet grinding into particles with the grain sizes being 1-2.5 mm through a disk, freezing, drying, and keeping the temperature for 3-6 h at the temperature of 300-800 DEG C to obtain porous corundum particles; then taking 80-97 wt% of alpha-Al2O3 micro powder, 2-10 wt% of nanometer aluminium oxide sol, and 1-5 wt% of MgO micro powder as mixtures, adding 30-50 wt% of organic alcohol, and conducting mixed grinding; pelleting the slurry obtained through mixed grinding and the porous corundum particles into particles of which the grain sizes are 3-10 mm, drying, and sintering for 1-5 h at the temperature of 1,700-1,900 DEG C, so as to obtain the light-weight composite corundum refractory aggregate. The light-weight composite corundum refractory aggregate product prepared by the invention is low in volume density, high in closed porosity, and high in slagging corrosion resistance.

The invention belongs to the technical field of refractory materials, and provides a composite lining material. After Al2O3-ZrO2 composite powder is added into the composite lining material, Al2O3 reacts with MgO in the low-carbon magnesium-carbon material to generate spinel. Spinel has the advantages of good slag corrosion resistance, thermal shock resistance, high high-temperature strength and the like, and is beneficial to improving the performance of the low-carbon magnesium-carbon material. The invention also provides application of the composite lining material in preparation of a refractory material. According to the composite material, the dependence on raw materials is reduced while the comprehensive performance of the refractory product is improved, the refractory material with excellent performance can be obtained through fewer raw materials, mineral resources are saved, and the energy consumption is reduced.

A jointing material for Mg-C bricks and Al-Mg-C bricks is prepared from solid powder which is the mixture of Mg sand, flaky graphite, solid resin, SiC, high-temp asphalt and metallic Si, and the liquid adhesive which is the mixture of furan resin, alcohol and washing oil through proportional mixing and stirring.

The invention provides a patching material for intermediate frequency electric furnace lining and a use method thereof. The invention is characterized in that the patching material is prepared by mixing the following raw materials according to percentage by weight: 1%-7% of waste glass powder, 25%-55% of electroquartz, 15%-35% of electroquartz micro powder, 17.5%-27.5% of chromic oxide micro powder, 5%-10% of zirconium oxide micro powder, and 0.5%-1.5% of boric anhydride. The use method is spraying on the furnace wall with a conventional spray gun at a temperature between 1000 DEG C and 1200 DEG C in the furnace to patch the furnace lining. The material of the invention can realize fast spraying and fast sintering, and can extensively prolong the service life of the furnace lining.

The invention relates to a fabricated part for a coal water slurry pressurization gasification furnace and a production method thereof. The technical scheme is as follows: the production method comprises the following steps of: by utilizing 40-70wt% of electric melting chromium oxide particles, 10-25wt% of fused zirconia alumina particles, 5-20wt% of electric melting chromium oxide fine powder, 2-10wt% of alumina micro powder, 3-10wt% of monoclinic zirconium oxide micro powder and 1-10wt% of chromium oxide green micro powder as raw materials, mixing the raw materials, and then, adding 0.5-3wt% of pure calcium aluminate cement, 0.1-0.8wt% of isobutylene polymer, 0.1-0.2wt% of a gather carboxylate water-reducing agent and 2-6wt% of water; and uniformly stirring, vibrating to form, curing at 20-50 DEG C for 1-2 days, demoulding, drying and sintering at 1400-1600 DEG C in the air. The preparation method is simple and low in production cost; and the fabricated part for the coal water slurry pressurization gasification furnace produced by the method has a long service life, high strength and excellent thermal shock resistance and corrosion resistance.

The invention relates to a corundum-spinel refractory brick and a preparation method thereof. The corundum-spinel refractory brick comprises 55 to 60% by weight of brown fused alumina particles as aggregates, 20 to 25% by weight of aluminum-magnesium spinel fine powder as a base material, 15 to 20% by weight of caustic calcined magnesite powder as a base material, 1 to 2% by weight of aluminum powder as a base material and 1 to 4% by weight of iron powder as a base material. The preparation method comprises uniformly mixing the base materials, adding the aggregates into the base materials, mixing the mixture for 5 to 8 minutes, adding 3 to 6 wt% of thermosetting phenolic resin into the base materials and aggregates, mixing the mixture for 10 to 15 minutes, carrying out mechanical pressing molding, carrying out maintenance at a temperature of 200-250 DEG C for 12 to 18 hours, putting the molded material into a muffle furnace, carrying out heating to 1500-1600 DEG C under nitrogen atmosphere conditions, carrying out thermal insulation for 2 to 3 hours, and carrying out furnace cooling to obtain the corundum-spinel refractory brick. The preparation method has the characteristics of low cost and simple processes. The corundum-spinel refractory brick has high sintered density, large high temperature flexural strength and strong anti-slag erosion resistance.