3273 results about "Bauxite" patented technology

Sintered, spherical composite pellets or particles comprising alumina fines, at least one of clay and bauxite and optionally a sintering aid, are described, along with a process for their manufacture. The use of such pellets in hydraulic fracturing of subterranean formations and in grinding is also described.

The invention provides a method for preparing aluminum oxide and other products from aluminiferous materials such as bauxite, high iron bauxite, alunite, kaoline, alumina, fly ash, coal gangue, aluminum ash, nepheline, clay and the like. The method comprises the following steps: (1) crushing, grinding and mixing the aluminiferous materials with ammonium sulfate and then roasting; (2) dissolving the roasted product (clinker aggregate) in water, and filtering to obtain aluminum ammonium sulfate solution and filter residues; (3) carrying out deferrization, aluminum deposition or recrystallization on the aluminium ammonum sulfate solution with ammonia to prepare aluminum oxide, and meanwhile, recycling the ammonium sulfate; (4) preparing silicon dioxide from the filter residues, and taking the remaining residues containing ferrum as the raw material for ironmaking. The method is suitable for treating various aluminiferous materials, has the advantages of simple technical process, simple equipment, no emission of solid, liquid and gas wastes, and no secondary pollution, and realizes the high-added-value green complex utilization of the aluminiferous materials such as bauxite, high ironbauxite, alunite, kaoline, alumina, fly ash, coal gangue, aluminum ash, nepheline, clay and the like.

The invention relate to a method of extracting scandium from red mud, the method utilize the red mud that come from the process of producing aluminum oxide from alumyte, in accordance with specific characteristics of red mud, applying hydrochloric acid leach, P204 abstraction, acid-washing edulcoration, sodium-hydroxide back extraction, ammonia modifier hydrolytic decomposition zirconium and titanate in hydrochloric acid solution, oxalic acid precipitating scandium and medium temperature calcining technique, the purity of final production Sc2O3 is 99.9%. Extracting scandium from red mud change refuse into available material, save mineral resources, benefiting environmental conservation. The invention also fills up the study vacant of isolation technique in high-strength zirconium titanate and scandium.

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.

A porous particulate material for treating a fluid containing a contaminant is disclosed. The particulate material comprises a cementitious matrix or binder and treated bauxite refinery residue or red mud. At least a portion of the pores in the particulate material is open cell or interconnected pores. The invention also relates to the use of a reactive permeable barrier comprising porous material, for treating a contaminated fluid. Also disclosed is a method for producing porous particulate material for treating a contaminated fluid and a method for treating a contaminated fluid, in which the porous material is used. The invention furthermore relates to a cementitious composition comprising partially neutralised red mud and cement, wherein the partially neutralised red mud has been pre-treated by contacting it with water having a total hardness supplied by calcium, magnesium or a combination thereof, of at least 3.5 millimoles per litre calcium carbonate equivalent. The cementitious composition is useful as a building and construction material.

A sintered rod-shaped proppant and anti-flowback agent possesses high strength and high conductivity. The sintered rods comprise between about 0.2% by weight and about 4% by weight aluminum titanate. In some embodiments, the sintered rods are made by mixing bauxitic and non-bauxitic sources of alumina that may also contain several so-called impurities (such as TiO₂), extruding the mixture, and sintering it. The starting material may optionally be milled to achieve better compacity and crush resistance in the final sintered rod. A fracturing fluid may comprise the sintered rods alone or in combination with a proppant, preferably a proppant of a different shape.

The present invention relates to dry refractory compositions having excellent thermal insulation values. The dry refractory composition also has excellent resistance to molten metal and slag. The composition comprises a lightweight filler material selected from the group consisting of perlite, vermiculite, expanded shale, expanded fire clay, expanded silica-alumina hollow spheres, vesicular alumina, sintered porous alumina, alumina spinel Stone insulating aggregate, ettringite insulating aggregate, expanded mullite, cordierite and anorthite, and a matrix material selected from the group consisting of calcined alumina, fused alumina, sintered magnesia, fused magnesia, Silicon fume, fused silica, corundum, boron carbide, titanium diboride, zirconium boride, boron nitride, aluminum nitride, silicon nitride, sialonite, titanium dioxide, barium sulfate, zircon, sillimanite Group of minerals, pyrophyllite, fire clay, carbon and calcium fluoride. The composition may also contain dense refractory aggregates selected from the group consisting of calcined clay, calcined clinker, minerals of the sillimanite group, calcined bauxite, pyrophyllite, silica, zircon, baddeleyite, cordierite , corundum, sintered alumina, fused alumina, fused quartz, sintered mullite, fused mullite, fused zirconia, sintered zirconia mullite, fused zirconia mullite, sintered magnesia, Fused magnesia, sintered spinel and fused spinel refractory clinker. The composition also contains a heat activated binder and a dust suppressant.

The invention relates to the field that biquaternary ammonium compounds are applied in silicate mineral flotation, and discloses a collector which applies the biquaternary ammonium compound with the constitutional formula shown as the formula I in bauxite or ironstone reverse flotation desiliconization. In the formula I, R<1> and R<2> are alkyls with 6-18 carbon atoms; R<3>, R<4>, R<5> and R<6> are respectively methyl, ethyl, -(CH2CH2O)nH, or -(CH(CH3)CH2O)nH, wherein, n is equal to 1-6; R<7> is alkylene with 2-6 carbon atoms; and X is Cl, Br or I. The collector of the invention has strong ability to collect quartz, kaolinite, illite and pyrophyllite, and is applicable to the silicate mineral separation from the bauxite or ironstone by reverse flotation, the suitable pH range of the flotation pulp is 5-13, and the dosage is equal to 50-500 g/t according to the content change of the silicate mineral in ores.

The invention belongs to the technical field of coatings for lost foam, in particular to a coating for lost foam cast iron. The invention provides the coating for the lost foam cast iron, which comprises the following components (calculated as the weight): 70 portions of bauxite, 30 portions of quartz powder, 2 to 5 portions of bentonite, 0.5 to 2 portions of white latex, 0.5 to 1.0 portion of sodium carboxymethyl cellulose, 2 to 3 portions of water soluble phenolic resin, 0.5 to 2 portions of attapulgite, 2 to 5 portions of spodumene powder, 0.01 to 0.03 portion of surfactant, and 0.01 to 0.02 portion of defoaming agent. The coating has thin and even coatings and good air permeability; the surfaces of castings are smooth, clean, and level and easy to peel off, and black defects are eliminated; and the castings have level surfaces and high surface quality.

The invention provides a harmless and comprehensive utilization method of secondary aluminum dross and relates to a harmless and comprehensive utilization method of secondary aluminum dross produced in an aluminum dross treating process. The harmless and comprehensive utilization method is characterized in that slurry is prepared from the secondary aluminum dross produced in the aluminum dross treating process and water, a stirring deamination reaction is performed, and ammonia gas formed through the reaction is condensed or absorbed by water; slurry after the reaction is subjected to liquid-solid separation, separated liquid phase is subjected to evaporative crystallization, and a chlorate and fluoride salt mixture is obtained; separated solid phase is used for producing a calcium aluminate material. With adoption of the method, the aluminum dross can be treated harmlessly, useful components in the aluminum dross are recovered efficiently, the harmless secondary aluminum dross can replace high-alumina bauxite for preparing a calcium aluminate product, production cost is reduced greatly, zero-release utilization of the aluminum dross is realized, the process is simple, the operation is convenient, the cost is low, environmental protection is realized, and the method has wide applicability.

The invention relates to a complex combination alumina-carborundum-(carbon) series amorphous fire proof material, and the formula comprises: 36 to 32 percent of 8-3mm corundum or bauxite, 18 to 26 percent of 3-1mm corundum or bauxite, 10 to 22 percent of 1-0.0088mm corundum or bauxite, 0 to 15 percent of 1-0.088mm carborundum, 0 to 3 percent of 1-0.0088 spherical asphalt, 0 to 20 percent of d90 less than 0.088mm corundum or bauxite, 0 to 20 percent of d90 less than 0.088 carborundum, 0 to 3 percent of d90 less than 0.088mm high-carbon materials, 0 to 5 percent of alpha alumina micro powder, 1 to 8 percent of alumina hydrate, 1 to 6 percent of silicon ash, 0 to 2 percent of calcium aluminate cement, 0.05 to 0.4 percent of plus super-plasticizer (polycarboxylic acids+sulfonated naphthalene formaldehyde polymer+sulfonated melamine polymer), 1 to 6 percent of plus polypropylene acid series latex and 1 to 6 percent of plus water. Compared with low-cement aluminum carborundum carbon material, the material has good anti-corrosion performance. Therefore, the service life of a kilneye of a cement kiln and a main groove slag line of a blast furnace can be prolonged when a product is combined by the complex combination alumina-carborundum-(carbon) series amorphous fire proof material instead of the cement.

A sintered rod-shaped proppant and anti-flowback agent possesses high strength and high conductivity. The sintered rods comprise between about 0.2% by weight and about 4% by weight aluminum titanate. In some embodiments, the sintered rods are made by mixing bauxitic and non-bauxitic sources of alumina that may also contain several so-called impurities (such as TiO₂), extruding the mixture, and sintering it. A fracturing fluid may comprise the sintered rods alone or in combination with a proppant, preferably a proppant of a different shape.

The invention discloses wear corrosion resistant castable prepared from a bauxite-based homogenous material and a preparation method thereof, which belong to the technical field of castable refractory. In the invention, by using the characteristics of the bauxite-based homogenous material, such as homogeneous chemical components and structure, stable performance, mulite main crystal phase, small linear change, high high-temperature strength and certain flexibility due to mutual insertion of micro crystals and the like, the shortcomings of low middle-temperature strength and poor wear resistance and alkali corrosion resistance of the conventional high-aluminum bauxite castable are overcome, and the problems of low middle-temperature strength, poor wear resistance and poor alkali, chloride and sulphur corrosion resistance of the conventional high-aluminum and corundum castable are effectively solved. The wear and corrosion resistant castable with high middle-temperature performance is prepared. The wear corrosion resistant castable and the preparation method thereof have the advantages of small fluctuation of water adding amount in construction, stable usability, reduction rate of partial corrosion, prolonged service life and wide application to a kiln hood, a grate cooler, a tertiary air duct and a decomposing furnace of a dry process cement kiln and relative parts of other ceramic and petrified thermo-technical kilns and the like.

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 discloses a titanium-containing calcium aluminate-high alumina bauxite modified refractory material, as well as a preparation method and application thereof, belongs to the field of refractory materials, and adopts the technical scheme that the modified refractory material comprises 25 to 40 wt% of high alumina bauxite, 25 to 40 wt% of titanium-containing calcium aluminate, and 30 to 35 wt% of co-ground powder, and a phenolic resin binding agent which accounts for 3 to 6 wt% of the total mass of the raw materials is additionally added, wherein the co-ground powder is formed by uniformly mixing titanium-containing calcium aluminate fine powder, alpha-Al2O3 micro-powder, graphite powder, silicon carbide fine powder, graphite powder, silicon carbide fine powder, metal aluminum powder and high-temperature asphalt powder; titanium-containing calcium aluminate comprises the following ingredients by ratio: 76.21% of Al2O3, 10.6% of TiO2, 10.16% of CaO, 0.6% of Fe2O3, 1.82% of MgO, and 0.62% of SiO2. According to the invention, titanium-containing calcium aluminate being industrial slag of steelmaking is effectively recycled, so as to greatly reduce the production and manufacture cost; as titanium-containing calcium aluminate is a solid solution of calcium hexaluminate, calcium dialuminate, aluminum titanate, calcium titanate and rutile, the modified refractory material is favorable in thermal shock resistance and heat-insulating property.

The invention discloses a low-density oil fracturing propping agent. The low-density oil fracturing propping agent comprises the following components in parts by weight: 40 to 90 parts of bauxite, 5 to 30 parts of clay and 1 to 30 parts of auxiliary additive, wherein the mass percentage of Al2O3 in the bauxite is 30 to 75 percent. The oil fracturing propping agent is prepared by blending the bauxite, the clay and the auxiliary additive in special proportion, and performing a pulverizing process, a pelletizing process and a sintering process on the mixture. Detection on the propping agent shows that the propping agent has the characteristics of wide raw material resource, low production cost and the like; the yield and mass of powder are improved, and the production cost is reduced; and the problems of large fracturing and propping volume density and visual density, large abrasion of fracturing to equipment, high construction cost and the like in exploitation of shale oil and shale gas, and shallow shaft fracturing construction of an oil well and a natural gas well in the prior art are solved. A preparation method of the low-density oil fracturing propping agent is simple in process, easy to operate and very suitable for industrial production.

The invention provides geopolymeric compositions, which have controllable thickening and setting times for a wide range of temperatures and a large range of geopolymer slurry densities. The geopolymer slurry compositions have good mixability and pumpability, whilst the set materials develop good compressive strength and permeability. The invention discloses a method for preparing geopolymer for oilfield cementing applications. The geopolymeric compositions according to the invention comprises a suspension made of an aluminosilicate source, a carrier fluid, an activator taken from the list constituted by: a metal silicate, a metal aluminate, an alkali activator, or a combination thereof, and an aluminum containing compound taken in the list constituted of bauxite, aluminum oxide and aluminum salt and the suspension is a pumpable composition in oilfield industry and the suspension is able to set under well downhole conditions.

The invention relates to a method for preparing a film-coated ceramisite proppant by using oil shale wastes. The method for preparing the film-coated ceramisite proppant by using the oil shale wastes is characterized by comprising the following steps of: 1) selecting raw materials which comprise the following raw materials in part by mass: 50 parts of the oil shale wastes, 50 parts of bauxite, and 1 to 4 parts of caking agent; 2) uniformly mixing the raw materials to obtain a mixture; 3) putting the mixture into a pan-type pelletizer for pelletizing to obtain raw material balls; 4) sintering the raw material balls to obtain a ceramisite aggregate; and 5) heating the ceramisite aggregate to the temperature of between 100 and 240 DEG C, adding a resin into the heated ceramisite aggregate and stirring the mixture uniformly first to ensure that the resin forms a film on the surface of the ceramisite aggregate, then adding a curing agent and other auxiliary agents, stirring the mixture uniformly, adding a lubricating agent, stirring the mixture uniformly, cooling to obtain a new mixture, crushing the new mixture and screening the crushed mixture through a 20/40-mesh sieve to obtain thefilm-coated ceramisite proppant. The method can extensively use the oil shale wastes and can solve the problem that the oil shale wastes harm the environment.

A structural formula of a 6-aliphatic hydrocarbon amido hexyl hydroximic acid collecting agent is represented by a formula (I), wherein R represents C2-C18 aliphatic hydrocarbon group. The preparation method comprises the steps as follows: caprolactam and hydroxylamine hydrochloride or hydroxylamine sulphate are taken as raw materials, methylbenzene is taken as a solvent, the reaction temperature ranges from 80 DEG C to 110 DEG C, the reaction lasts for 1-4 hours, and 6-amino hexyl hydroximic acid is generated; 6-amino hexyl hydroximic acid reacts with C2-C18 fat carboxylic acid at the reaction temperature ranging from 100 DEG C to 160 DEG C for 1-4 hours to generate 6-aliphatic hydrocarbon amido hexyl hydroximic acid, and the product yield can be higher than 91%; and 6-aliphatic hydrocarbon amido hexyl hydroximic acid used in flotation of scheelite, wolframite, tombarthite ore, tin ore, bauxite, titanic iron ore or fluorite ore is taken as the collecting agent, so that the flotation recovery rate can be increased by 3%-10%.

The invention relates to a centrifugal casting roller coating and a preparation method thereof. The centrifugal casting roller coating is characterized by comprising the following compositions in percentage by mass: 12 to 15 percent of zircon powder, 8 to 10 percent of quartz powder, 8 to 10 percent of bauxite, 0.3 to 0.6 percent of silica sol, 0.1 to 0.4 percent of sodium carboxymethyl cellulose, 0.15 to 0.35 percent of alkyl benzene sodium sulfonate, 0.15 to 0.35 percent of sodium sulfate, 0 to 0.02 percent of n-butyl alcohol, 0 to 0.02 percent of n-octyl alcohol, 0.10 to 0.18 percent of fatty alcohol polyethenoxy ether, and the balance being water, wherein the mass percentage of the zircon powder + the quartz powder + the bauxite is more than or equal to 30 percent and less than or equal to 35 percent, the mass percentage of the alkyl benzene sodium sulfonate + the sodium sulfate is more than or equal to 0.35 percent and less than or equal to 0.55 percent, and the mass percentage of the n-butyl alcohol + the n-octyl alcohol is more than or equal to 0.02 percent and less than or equal to 0.03 percent. The coating is used for centrifugal casting roller production after stirring, grinding and sieving, and has good use effect.

The invention relates to a mill run desiliconizing method for the mixed alumyte, in particular to a mill run desiliconizing method for the mixed alumyte with the gibbsite. The invention is characterized in that: smashing the mixed alumyte, adding the water to make slurry and make the ore smash, abstracting the coarse fraction mineral and the fine fraction mineral in the products by means of a screen separation craft or a grade craft, fine grinding the coarse fraction mineral which is abstracted, then mixing the milling grinding products and the fine fraction mineral which is abstracted by means of the screen separation craft or the grade craft, and carrying through a floatation. After the invention is carried into execution, the mill run desiliconization of the mixed alumyte with the gibbsite in middle or low grade is realized; the invention has a higher coefficient of recovery under the condition of guaranteeing A/S ratio of the ore concentrate. The invention has the advantages of simple and steady technological process, strong operability, capability of enlarging the resource supply of alumyte and providing a technical support for economy when the alumyte resources are needed, and important economic meaning and a social meaning for the sustainable development of the alumina industry.

The present invention relates to amorphous refractory material, and is especially one kind of no-water stemming material for blast furnace taphole and its preparation process. The no-water stemming material is prepared with coke powder 15-25 wt%, clay 10-20 wt%, bauxite corundum 20-36 wt%, silicon carbide 10-20 wt%, asphalt 8-16 wt%, sericite 5-9 wt%, additive 1-5 wt% and binding agent 12-22 wt%, and through crushing, sieving, pre-mixing, rolling, kneading and extruding. The no-water stemming material has excellent plasticity and sintering performance, high strength at high and middle temperature and high slag and molten iron flush resistance, and can meet the requirement of high strength smelting in blast furnace.

The invention discloses a method for the comprehensive utilization of high-iron bauxite. The method comprises the following steps: uniformly mixing finely ground high iron bauxite and additives, carrying out reduction roasting by using coal as a reducing agent, and carrying out ore grinding and magnetic separation after reduction to obtain directly reduced iron powder (magnetic product) and aluminum-enriched slag (non-magnetic product); carrying out agitation leaching on the aluminum-enriched slag with leaching agent to dissolve aluminum and silicon in the solution; adsorbing the silicon in the leach solution by using porous adsorbent, and further separating the adsorbed silicon to prepare white carbon black, molecular sieves and other silicon-based products; and extracting chemical products, such as aluminum oxide, aluminum sulfate or the like, from the solution after silicon separation. When high-iron bauxite is processed by using the method, aluminum, iron and silicon can be separated, and simultaneously, valuable elements can be processed into products for different purposes so as to realize value-added processing. Besides, the method has the characteristics of short flow, low energy consumption, high comprehensive utilization rate of resources and the like, thereby having wide application prospects.