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2398 results about "Coal gangue" patented technology

Gangue, also called coal gangue, is the solid waste discharged in coal mining process and coal washing process, black rock harder than coal. Its carbon content is low and exists along with coal seam. Gangue could be found in roof, bottom board, inter-layer, and it could be selected in washing process.

Method for preparing aluminum oxide from aluminiferous material

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.
Owner:NORTHEASTERN UNIV

Composite tailing non-fired and non-steamed building block brick and preparation method thereof

InactiveCN102093004AHigh waste rateSolve the problem of excessive dosageSolid waste managementBrickSlag
The invention discloses a composite tailing non-fired and non-steamed building block brick and a preparation method thereof. The brick comprises the following raw materials in parts by weight or volume: 50-300 parts of tailing and 3-30 parts of cement; and at least two components are selected from the active wastes such as fly ash, coal gangue, shale slag, alkaline residue, carbide slag, chemical gypsum and the waste residue of metallurgical industry to be mixed with the raw materials. The preparation method comprises the following steps: mixing to stir, compressing and shaping, performing natural curing or utilizing the solar heaing hydrating maintenance to prepare the composite tailing building block brick. By adopting the preparation method of the invention, the single performances of the tailings and slags can be changed, thus the product can have higher strength and quality owning to the interaction of materials; the technology does not adopt firing and steaming, the cost is low; different sizes of solid bricks, perforated bricks, hollow blocks, floor tiles, grass planting bricks, roadside bricks and artistic rails can be prepared by changing the mould; and various harmful slags such as tailings can become good, the Chinese development direction of the comprehensive utilization of resources is satisfied and the brick of the invention has development and application prospect.
Owner:郭东京 +2

Automatic separator of coal gangue

ActiveCN101637765ANo mutual interferenceSolve the technical problems of poor sorting effectSortingConveyor partsX-rayGamma ray
The invention relates to an automatic separator of coal gangue, which comprises a raw material feeding copper, a coal receiving copper, a gangue receiving copper, a conveying-belt conveyor, an identification and separation controlling mechanism and an executing mechanism, wherein the conveying-belt conveyer is arranged among the raw material feeding copper, the coal receiving copper and the gangue receiving copper; the identification and separation controlling mechanism comprises a single-energy gamma ray source, an X-ray sensor, a measure and control instrument and an ultrasonic transmitter-receiver; the single-energy gamma ray source is arranged below a conveying belt, the X-ray sensor is arranged above the conveying belt and corresponds to the single-energy gamma ray source, the measure and control instrument is electrically connected with the X-ray sensor, and the ultrasonic transmitter-receiver is arranged above the conveying belt and electrically connected with the measure and control instrument; the executing mechanism is a high-frequency air valve arranged above the coal receiving copper and the gangue receiving copper; and the valve port of the high-frequency air valve isarranged towards a throwing track of coal and gangue. As the single-energy gamma ray source is adopted, only one nuclear radiation material exists, and only one spectral line is radiated, the mutualinterference among a plurality of spectral lines can not be generated; and the invention has accurate measurement and good separation effect.
Owner:GREAT DRAGON RISING ELECTROMECHANICAL TECH BEIJING

Geopolymer gel material for rush repairs and rush constructions

The invention provides a geopolymer gel material for rush repairs and rush constructions, which is prepared by adding water to 13-17 percent by weight of exciting agent and 82-87 percent by weight of slag containing aluminosilicate. The slag comprises one or the combination of more of blast furnace slag, steel slag, coal ash and coal gangue, and the exciting agent comprises the following components in percentage by weight: 35-75 percent of SiO2, 0-55 percent of Na2O, 0-65 percent of K2O, 0-1 percent of CaO and 0-1 percent of SO3. The geopolymer gel material which has the characteristic of quick setting and hardening is prepared by using the industrial waste slag as a main raw material and matching the exciting agent, and the geopolymer gel material has excellent mechanical property and controllable setting time and can replace gel materials such as fast setting and hardening cement, and the like in the processes of rush repairs and rush constructions. The industrial solid wastes such as the blast furnace slag, the steel slag, the coal ash, the coal gangue, and the like containing the aluminosilicate series are used as main raw materials, metakaolin is not added and the raw materials do not need to be calcined, thus the invention has low energy consumption, less pollution, simple process, low cost, environmental protection and energy saving.
Owner:深圳市航天新材科技有限公司

Method for preparing foam ceramic self-insulation wall material by utilizing solid wastes

The invention relates to a method for preparing a foam ceramic self-insulation wall material by utilizing solid wastes. The wall material comprises a main material and an admixture. The main material is prepared from the following components in proportion: 25% to 35% of chromium slags, 19% to 27% of coal gangue, 20% to 26% of waste ceramic polishing residues, 17% to 25% of albite and 1% to 6% of bentonite. The method comprises the following steps of: adding 16 to 20g of the admixture into every 200g of the main material; evenly mixing and screening the mixture; putting the mixture into a die; molding the mixture in a pressing manner and drying; sintering the mixture under a strong reducing atmosphere at the temperature of 1120-1180 DEG C, thereby obtaining the foam ceramic self-insulation wall material. The carbon in the coal gangue can serve as a foaming agent or a reducing agent, so that hexavalent chromium is reduced into chromium sesquioxide at the high temperature and under the strong reducing atmosphere. Thus, the toxicity of the chromium slags is eliminated. The prepared foam ceramic self-insulation wall material is low in pyroconductivity, small in density and low in water absorption rate; the usage temperature can reach 900 DEG C. In addition, the foam ceramic self-insulation wall material is complete in fire resistance, high in strength and long in service life, and can be used for replacing the existing wall materials and flammable insulation materials. The wall material integrates protection and thermal insulation functions; an exterior wall insulating layer is not required. Thus, the construction cost is lowered.
Owner:HENAN COAL CHEM IND GROUP INST +1

Cooperative processing and recycling method for material containing iron and/or zinc, lead, copper and tin, and the like and molten steel slag

The invention discloses a process method for cooperatively and continuously processing waste containing iron and/or zinc, lead, copper and tin, and the like and molten steel slag on line, separating and recycling metal such as iron, zinc, lead, copper and tin as well as molten slag. The cooperative processing and recycling method is characterized in that pellets prepared from waste containing iron, zinc, lead, copper, tin and the like, particles, a blocky material containing iron, zinc, lead, copper, tin and the like and high-temperature molten steel slag are added into a reducing, volatilizing and smelting furnace, molten iron, which is obtained by air-blowing, adding of fuels such as coal gangues and flux such as high silicon and high aluminum, high-temperature reducing and volatilizingtreatment, is discharged from an iron outlet of the reducing, volatilizing and smelting furnace; volatilized substances such as zinc and lead and smoke gas are sucked into a dust collector for being collected and utilized; enriched metal such as gold, silver, copper, tin and lead is discharged from a discharge hole in the bottommost part of the reducing, volatilizing and smelting furnace for beingrecycled; and molten slag is discharged through a slag outlet, water slag and the like or the molten slag is returned into a converter for being recycled. Waste containing iron, zinc, lead, copper, tin and the like, molten steel slag and coal gangue waste slag and the like are cooperatively and continuously treated to separate and recycle useful metal, so that remarkable energy-saving environment-friendly social benefits and economic benefits are achieved.
Owner:湖南建鑫冶金科技有限公司

Method for comprehensive utilization of aluminum-containing material

The invention relates to a method for preparing aluminum oxide and other products by aluminum-containing materials of bauxite, alunite, nepheline, fly ash, kaolin, coal gangue and clay. The method comprises the following steps: (1) crushing and grinding an aluminum-containing material, carrying out mixing and baking for the treated aluminum-containing material and ammonium bisulfate; (2) carryingout dissolution and filtering for the baked clinker to obtain a crude ammonium aluminum sulfate solution and aluminum extracting residue; (3) carrying out an iron precipitating treatment for the ammonium aluminum sulfate solution with the concentration more than 1 g/L by adopting a jarosite method, then carrying out an iron precipitating treatment by a goethite method, carrying out an aluminum precipitating treatment for the resulting solution, carrying out calcination for the resulting aluminium hydroxide to prepare aluminum oxide; (4) carrying out an iron precipitating treatment for the ammonium aluminum sulfate solution with the concentration less than 1 g/L by adopting the goethite method, and carrying out an aluminum precipitating treatment to prepare aluminum oxide, or adopting a recrystallization method to carry out purification, adopting a reaction of the ammonium aluminum sulfate crystal and a ammonium carbonate solution to precipitate the aluminum to obtain ammonium aluminumcarbonate, carrying out calcination for the ammonium aluminum carbonate, and adopting a Bayer method to treat the calcined ammonium aluminum carbonate to prepare sandy aluminum oxide; (5) washing anddrying the aluminum extracting residue, wherein the dried aluminum extracting residue is adopted as the silicon dioxide product.
Owner:NORTHEASTERN UNIV

Coal gangue-fly ash-sludge substrate and mycorrhiza technology for restoring ecology of mining area

InactiveCN101920261AOvercome poor water holding capacityOvercoming low fertilityContaminated soil reclamationBiological sludge treatmentSurface layerSludge
The invention relates to a coal gangue-fly ash-sludge substrate and a mycorrhiza technology for restoring ecology of a mining area. The invention belongs to the technical field of environmental protection, and relates to an ecology restoring technology, in particular to a method for restoring the ecology of an abandoned coal mine area. The method for restoring the abandoned coal mine area by the mycorrhiza technology of the invention adopts a composite substrate prepared by mixing fly ash, coal gangue and sludge, and comprises the following steps: a, preparing an inoculant; b, preparing a basic plant material; c, carrying out inoculating mycorrhiza treatment on the plant by the inoculant obtained in the step a; d, analyzing the physicochemical property of the abandoned coal mine area, and carrying out mixed treatment to form the composite substrate; and e, sowing seeds on the composite substrate surface layer of the treated abandoned coal mine area. The method of the invention can improve the adaptability of plants to the complex adverse environment of the abandoned coal mine area, wherein the adaptability comprises stronger nutrient acquisition capability and cold resistance, thereby fully utilizing waste and sludge in the mining area, and solving the source problem of other soil for melioration in the mining area.
Owner:CHINA UNIV OF MINING & TECH

Efficient ecotype inorganic formaldehyde adsorbing material and preparation method thereof

The invention relates to an efficient ecotype inorganic formaldehyde adsorbing material which is obtained by mixing and curing 50%-75% of a solid raw material containing aluminosilicate, 10-40% of alkaline solution and 10%-15% of a complex reaction activator, wherein the solid raw material containing the aluminosilicate comprises at least one of the following raw materials: clay, kaolin, coal gangue, fly ash, waste incineration ash, slag, red mud and the like; alkali content of the alkaline solution is 3-12mol/L[OH-]; and the complex reaction activator comprises two components at mass ratio of 75-85% of a silicate substance and 15-25% of Al2O3 particle size of which is more than 1000 meshes. The inorganic adsorbing material is of a net porous gel structure, total pore volume is 0.17mL/g-0.36mL/g, specific surface area is 300-650m<2>/g, and pore distribution mainly adopt two modes of micropores (pore diameter is less than 2nm) and mesopores (pore diameter is 2-50nm), wherein the pore volume of the micropores (45%-60%) and the mesopores (25%-50%) accounts for 85%-95% of the total pore volume. The inorganic adsorbing material comprises 80-95% of an amorphous component and 5-20% of a crystal component based on the total mass of the material.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)
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