1246 results about "Calcium aluminates" patented technology

Disclosed are a high-performance expansion cement clinker, a manufacturing method of the cement clinker, a series concrete expansion agent and a manufacturing method of the concrete expansion agent. The high-performance expansion cement clinker is made as follows: firstly, 50-90 wt% of limestone, 1-20 wt% of bauxite, 5-30 wt% of gypsum and 1-5 wt% of iron powder are grinded together into raw meal, then the raw meal is calcined at 1250-1400 DEG C in a rotary kiln, a tunnel kiln or a roller kiln to get the cement clinker. The cement clinker is milled alone or in combination with sulfur calcium aluminate cement clinker, calcium aluminate cement clinker, anhydrite, calcined gangue, alunite, calcined kaolin and hydration heat inhibiting additives until the specific surface area reaches 200-400m2/kg, so as to get the series concrete expansion agent. The high-performance expansion cement clinker disclosed in the invention is calcium hydroxide-hydrated calcium aluminate sulfate double-expansion source expansion clinker, which is fast in expansion rate and high in expansion efficiency and uses less bauxite of scarce resources; besides, the calcination temperature is low to avoid calcium oxide dead burning, so the preparation is safe and reliable.

The invention relates to an organic-inorganic composite combined advanced monolithic refractory which has the formula of 40 to 56 percent of 5-1mm corundum or bauxite, 12 to 30 percent of 1-0.0088mm corundum or bauxite, 16 to 25 percent of corundum or bauxite with d90 less than 0.088mm, 0 to 5 percent of alpha alumina micropowder, 1 to 8 percent of hydratable alumina, 1 to 6 percent of siliceous dust, 0 to 2 percent of calcium aluminate cement, 0.05 to 0.4 percent of external efficient water reducing agents (polycarboxylic acid plus sulfonation naphthaldehyde polymer plus sulfonation melamine polymer), 1 to 6 percent of latex of the system of external polyacrylic acid, 1 to 6 percent of external water and 0 to 3 percent of external heat-resistant steel fiber. Casting materials of the invention have excellent performances of condensation, hardening, demoulding, drying and heating and are suitable for high-temperature furnace projects with changeful field conditions.

The invention relates to corundum and spinel castable and a preparation method thereof. According to the scheme, the method comprises the following steps of: blending 1 to 10 weight percent of magnesia-alumina spinel fine powder, 5 to 10 weight percent of white fused corundum fine powder, 5 to 10 weight percent of alpha-Al2O3 micro powder, 2 to 8 weight percent of pure calcium aluminate cement, 0.06 to 0.2 weight percent of poly carboxylic acid water reducing agent, and 0.01 to 0.1 weight percent of organic fiber, and precasting mixed powder; performing dry-blending on 6 to 18 weight percent of partially stable zirconia particles or calcium zirconate particles, 45 to 70 weight percent of tabular corundum particles and 1 to 10 weight percent of magnesia-alumina spinel particles which are used as aggregate for 4 to 6 minutes, adding the mixed powder, and milling for 15 to 30 minutes; and adding water in an amount which is 3 to 6 percent based on the weight of the mixed powder and aggregate, milling for 3 to 5 minutes, vibrating and performing casting moulding, curing for 20 to 26 hours, demoulding, drying at the temperature of between 100 and 120 DEG C for 20 to 26 hours, raising temperature to 1,450 to 1,750 DEG C, and preserving heat for 2 to 4 hours. The prepared corundum and spinel castable is high in thermal shock resistance, high-temperature strength, and strength retention rate after thermal shock, and long in service life.

A method for comprehensive utilization of red mud, phosphogypsum and coal gangue comprises the following steps: red mud, phosphogypsum and coal gangue are used as main original burning materials, a correction material is taken as a secondary original burning material, a homogeneous moisture material is prepared through two-stage batching process and is shaped or dried and crushed, and then a clinker product including main ingredients of dicalcium silicate, calcium sulphoaluminate and calcium sulphoferrite is prepared through calcination. The clinker produced by the method can be not only directly sold as a product but also further processed into a cementing material or product for sale by utilizing the prior art. The method provided by the invention is simple in process and low in investment, the production scale can be either big or small, a rapid hardening early strength clinker produced by the method is wide in use and relatively higher in value, not only are lots of clay resources and non-renewable burning coal saved, but also environmental pollution caused by waste pollutants are effectively reduced, secondary disasters is prevented, and high industrial competitiveness and favorable investment economical efficiency are realized.

The invention relates to the technical field of building material, in particular to a maritime work concrete corrosion-proof additive. The maritime work concrete corrosion-proof additive consists of a calcium sulphoaluminate expansion agent, a methyl naphthalene sulphonic acid water reducing agent, organosilicon hydrophobic powder, neopentylene glycol, milled slag powder, polypropylene fibers, silicon ash, superfine fly ash and arenaceous quartz. The maritime work concrete corrosion-proof additive can reduce the water consumption for mixing concrete, improve the water retention and cohesiveness, and improve the resistance of the concrete to seawater erosion and the durability.

The invention relates to a light-weight Al2O3-SiC-C refractory casting material and a preparation method thereof. The light-weight Al2O3-SiC-C refractory casting material comprises the following raw materials: 40-55 wt% of porous corundum particle, 8-12 wt% of corundum particle, 6-12 wt% of SiC particle, 6-10 wt% of SiC fine powder, 5-8 wt% of corundum fine powder, 8-12 wt% of active aluminum oxide micropowder, 3-5 wt% of calcium aluminate cement, 2-4 wt% of silicon oxide micropowder, 2-4 wt% of ball asphalt, 1.5-2.0 wt% of silicon powder, 0.1-0.3 wt% of aluminum powder and 0.1-0.3 wt% of boron carbide powder. The preparation method comprises the following steps: mixing the raw materials with 8-15 wt% of water, 0.2-0.6 wt% of water reducing agent and 0.02-0.04 wt% of organic explosion-proof fiber, stirring, casting, molding, and naturally drying at 110 DEG C for 12-48 hours to obtain the light-weight Al2O3-SiC-C refractory casting material. According to the invention, the process is simple; and the prepared product has the characteristics of high strength, excellent thermal shock stability, low heat conductivity and high medium erosion resistance, and also has the advantage that the apparent porosity and pore size can be controlled.

The invention discloses a lightweight reformed main iron runner pouring material. The pouring material comprises alumina, brown aluminum oxide, SiC, SiO2 micropowder, alpha-Al2O3 micropowder, spherical asphalt, aluminum oxide hollow sphere, explosion-proof fiber, metal silicon powder, andalusite fine ore powder, calcium aluminate cement and sodium tripolyphosphate. In the invention, lightweight reformation is carried out on the traditional heavy refractory material iron runner material by introducing the aluminum oxide hollow sphere into a main iron runner material; and due to the popularization and application of the lightweight reformed main iron runner pouring material, the consumption of the refractory material can be reduced for a user, the heat preservation and energy saving of high-temperature equipment are favorably promoted. By adding the aluminum oxide hollow sphere, the volume density of the product is reduced, the heat conduction coefficient is reduced, and the heat preserving effect on the main iron runner pouring material is achieved.

The invention discloses a processing method for recycling aluminum dross, which comprises the following steps: adding crushed limestone and catalyst to aluminum dross, thoroughly homogenizing and mixing the three materials, carrying out catalyzed calcination on the thoroughly homogenized and mixed materials in a calcination reaction furnace, and directly grinding the calcined products or grinding the calcined products after cooling, thus obtaining the calcium aluminate powder product. The processing method has a simple operational process, and can not cause new environmental pollution, thereby according with the policy for industry development. The invention recycles the aluminum dross, simultaneously reduces environmental pollution caused by the aluminum dross, improves the environmental management on surrounding areas, and also provides a reasonable and effective way to recycle waste aluminum dross. Thus, the invention has obvious economic benefits and social benefits.

The invention discloses an ultra-pure steel corrosion-free type covering agent and a production method thereof. The covering agent comprises the following components in percentage by weight: not more than 6 percent of SiO2, 40 to 45 percent of CaO, 7 to 11 percent of MgO, not more than 1.5 percent of Fe2O3, 29 to 35 percent of Al2O3, not more than 1 percent of Na2O, not more than 1 percent of F and not more than 1 percent of fixed carbon. The invention has the advantages that: premelting type refining slag, premelting type aluminum-calcium slag, calcium aluminate cement and light-roasted dolomite carbon-free low-silicon high-alkalinity materials are used as raw materials, the materials are reasonably matched with one another, and a covering slag atomization granulation production process is used for production, so that the covering agent has the advantages of high spreadability, no incrustation and no silicon addition, is easy and convenient to operate and use, improves the quality ofpurified molten steel during use, is granular, does not have dust pollution, and the like.

The invention belongs to a building material and particularly relates to an algae calcium compound material, a decorative panel and a production method. Kieselguhr and a calcium-containing inorganic building material substrate are hydrated, gelled and compounded, thereby forming the algae calcium compound material, wherein the calcium-containing inorganic building material substrate is selected from one or more of hemihydrate calcium sulfate, calcium phosphate and calcium aluminate; preferably, the components are mixed at a weight ratio of the calcium-containing inorganic building material substrate to kieselguhr to enhanced fiber chopped strand to water-based gel solution to chemical auxiliaries being 100:(10-50): (1.2-2.0): (50-65): (5-10); and the raw materials are subjected to raw material pretreatment, mixing and stirring, filling and molding, maintaining and drying, and surface treatment, thereby forming a decorative material product. The excellent plasticity and environmental friendliness of the novel compound material are fully excited while the microporosity of the kieselguhr is utilized to endow the material with excellent functions of humidifying and absorbing harmful gas, such as, formaldehyde, and the like, and the environmental protecting functions, such as sterilization, and the like.

A bonding agent comprises a flux containing either calcium aluminate or calcium oxide and aluminum oxide and containing less than 5 wt % rare-earth elements; and aluminum nitride powder.

The invention discloses a lightweight calcium hexaluminate-magnesia alumina spinel composite microporous refractory aggregate for lightweight refractory castables and a preparation method thereof. The lightweight calcium hexaluminate-magnesia alumina spinel composite microporous refractory aggregate is obtained by taking 3 to 7 weight percent of lime, 12 to 18 weight percent of magnesite and 75 to 85 weight percent of industrial aluminum hydroxide as initiative materials, adding a binding agent in an amount which is 3 to 6 percent of the total weight of the initial materials, performing wet co-grinding and machine molding, drying a green body and then calcining the green body, and crushing a product obtained after calcination. The lightweight microporous aggregate has the advantages of high stability in reducing atmosphere and alkaline environment, excellent thermal shock resistance and thermal insulation property and the like, so that the service life of the material is prolonged andthe loss of energy consumption is reduced.

The invention particularly relates to an Al2O3-SiC-C iron runner casting material and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: carrying out uniform dry mixing on raw materials 50-60 wt% of electrofused brown corundum granules, 8-12 wt% of electrofused brown corundum fine powder, 3-10 wt% of silicon carbide granules, 6-11 wt% of silicon carbide fine powder, 3-7 wt% of alpha-Al2O3 micropowder, 2-4 wt% of pelleted pitch, 2-4 wt% of silicon dioxide micropowder, 2-4 wt% of calcium aluminate cement, 2-4 wt% of metal antioxidant and 0.1-0.3 wt% of dispersant together with catalyst accounting for 0.1-3 wt% of the raw materials to obtain the Al2O3-SiC-C iron runner casting material. The invention has the advantage of low preparation cost; and the prepared Al2O3-SiC-C iron runner casting material has the advantages of low water addition amount, high flow value, favorable high-temperature service performance and high thermal shock stability, and so that the blast furnace iron runner has high iron flux and low refractory material consumption.

The invention relates to a micropore high-strength corundum-calcium hexaluminate composite refractory raw material and a preparation method of the material. The technical scheme adopted by the invention is as follows: 94-98wt% of aluminum oxide fine powder or aluminium hydroxide fine powder is taken as an aluminium source; 1-6wt% of calcium carbonate fine powder or calcium hydroxide fine powder is taken as a calcium source; water is added into the raw materials, and the quantity of the water is 30-60wt% of the total quantity of the raw materials; the raw materials are mixed in the water; wet grinding is carried out on the mixture by virtue of a ball grinding mill for 0.5-2 hours; after being solidified, the slurry processed by wet grinding is subjected to heat preservation for 12-48 hours at the temperature of 110-200 DEG C; then, heat preservation is carried out at 1750-1900 DEG C for 3-5 hours; and finally, after the product is burnt and crushed, the micropore high-strength corundum-calcium hexaluminate composite refractory raw material can be obtained. The micropore high-strength corundum-calcium hexaluminate composite refractory raw material prepared by the method has the characteristics of being high in slag resistance, excellent in thermal shock resistance and heat-insulating property and the like, and can be used at the parts such as a steel ladle and the like contacted with molten steel and used for replacing corundum in other refractory material taking the corundum as a raw material, so that the service life of the material is prolonged, and the energy consumption is reduced.

The invention discloses calcium aluminate cement-combined corundum castable and a preparation method thereof. With calcium aluminate cement as a binding agent, tabular corundum and activated aluminum oxide as main components, and titanium dioxide/calcium carbonate/magnesium oxide micro-powder as a compound additive, the high-strength calcium aluminate cement-combined corundum castable is prepared. By combining with the characteristics of accelerating sintering by virtue of titanium dioxide and forming spinel and calcium carbonate to convert into high-activity calcium oxide at a high temperature by reaction of magnesium oxide and corundum, the strength of the corundum castable is greatly improved. The prepared high-strength calcium aluminate cement-combined corundum castable has excellent performance, and can be applicable to the industries such as building materials, metallurgy and petrifaction; and the service life of equipment such as a cement kiln opening, a coal-injection duct, an induction furnace lining and a high-temperature wear-resisting lining is effectively prolonged.

The invention relates to a method of utilizing wasted aluminum ash to produce calcium aluminate. The method comprises the steps as follows: wasted aluminum ash and calcium oxide are adopted as the raw materials; coke as the reducing agent and scrap iron as the settling agent are added, and smelted under high temperature in an electric arc furnace; the calcium aluminate produced after the melting is poured and cooled, and mulled and sieved, and utilized as the desulfurizer in making steel. The invention of simple technique does not require to process the wasted aluminum ash, which can instead bauxite to produce high-purity calcium aluminate, so that the invention reduces the production cost of the calcium aluminate, recycles the wasted aluminum ash which causes environmental pollution easily, and brings about remarkable comprehensive benefits socially and economically.

To provide a spraying material having an excellent quick-setting property and excellent adherability, a small alkali amount and excellent initial strength development, and a spraying method using it. The spraying material comprises a liquid quick-setting admixture containing an aluminum source, a sulfur source and a fluorine source, one or more quick-setting aids selected from the group consisting of calcium aluminate, calcium sulfoaluminate, calcium aluminosilicate, an alkali metal-containing substance, calcium hydroxide and aluminum hydroxide, and a cement concrete, and the method is to spray this spraying material.

The present invention provides for a refractory aggregate composition comprising an improved calcium aluminate clinker having the formula C_nA_x wherein C is calcium oxide and A is aluminum oxide, wherein n is an integer from about 1 to about 12, wherein x is an integer from about 1 to about 24, and wherein said clinker has less less than about fifty weight percent C₁₂A₇. Analogs, derivatives and hydrates of the improved calcium aluminate clinker are provided. A refractory composition and a sprayable refractory composition are disclosed comprising the improved calcium aluminate clinker.