89 results about "Pulverised fuel ash" patented technology

The present application belongs to the technical field of building materials. More particularly, it relates to a composite mineral admixture for mass raft concrete and a preparation method thereof. The product prepared by the present application comprises fly ash and silica fume; wherein the mass ratio of the fly ash and the silica fume is 2.5:1-3.5:1; the D50 of the fly ash is 80-90 microns; the D50 of the silica fume is 0.15-0.25 times that of the fly ash; the surface of the fly ash comprises a carbon-coated layer; the carbon-coated layer accounts for 10-12% of the mass of the fly ash. In the silica fume, the content of Fe element is 0.010-0.015%; in addition, it also comprises 20-25% of the mass of the silica fume of blast furnace slag powder; the D50 of the blast furnace slag powder is 0.5-0.6 times that of the fly ash. The porosity of the blast furnace slag powder is 40-50%; the porosity of the fly ash is 55-65%; and the porosity of the silica fume is 10-15%.

This invention relates to the field of non-fired brick preparation technology, specifically disclosing a method for preparing non-fired bricks with recycled concrete aggregate for thermal insulation. The method includes the following steps: (1) Immersing the recycled concrete coarse aggregate in a saturated calcium bicarbonate solution, then removing and drying the coarse aggregate to obtain pretreated coarse aggregate. (2) Taking the following raw materials: 45-62 parts by weight of slag powder, 18-25 parts by weight of silicate cement, 6-10 parts by weight of fly ash cenospheres, 30-40 parts by weight of the pretreated coarse aggregate, 55-70 parts by weight of sand, and 1-2 parts by weight of water-reducing agent. The above raw materials are mixed evenly, and then mixing water is added according to a water-cement ratio of 0.18-0.22. After mixing, the resulting brick is pressed into a blank and naturally cured to obtain non-fired bricks. The method of this invention can effectively reduce the adverse effects of recycled concrete aggregate on the mechanical properties of non-fired bricks, and the non-fired bricks prepared by this invention also have good thermal insulation properties.

The application discloses a fly ash-based sand-fixing system, a sand-fixing method and application. The sand-fixing system comprises fly ash-based sand-fixing particles, a fly ash-based sand-fixing plate device and a fly ash-based sand-fixing agent; the fly ash-based sand-fixing particles are laid on a sand surface layer and used for slowing down wind speed and intercepting floating sand; the fly ash-based sand-fixing plate device comprises a plate body and a fixing member, the plate body is perpendicular to a main wind direction, and the fixing member is used for achieving detachable splicing of adjacent plate bodies, so as to form a three-dimensional grid protection structure and block wind sand migration; and the fly ash-based sand-fixing agent is applied to the sand surface layer to form a consolidated layer and consolidate the surface sand body. The fly ash-based sand-fixing particles, the fly ash-based sand-fixing plate device and the fly ash-based sand-fixing agent are cooperated to form an initial stable layer, a physical barrier and a consolidated layer, and the sand-fixing system has the advantages of high strength, environmental protection, long-term effect and economy and is suitable for rapid treatment of desertification land.

This invention discloses an early-strength, high-stability road grouting repair material and its preparation, belonging to the field of solid waste utilization and road grouting reinforcement technology. The raw materials of the early-strength, high-stability road grouting repair material of this invention include multi-source solid waste aggregates and a water-reducing agent; the multi-source solid waste aggregates, by mass percentage, include: 6.6 wt% fly ash, 5-15 wt% rapid-hardening sulfoaluminate cement, 64-74 wt% mineral powder, 13.4 wt% desulfurized gypsum, and 1% carbide slag. This invention constructs a quaternary solid waste system of fly ash-desulfurized gypsum-mineral powder-carbide slag, synergistically forming a slurry composite system with rapid-hardening sulfoaluminate cement and a water-reducing agent, and precisely controls the concentration of raw materials. During hydration, this system can generate supporting crystals, which not only provide high early-stage stone strength for the road grouting material, but also, due to its good stability, ensure high stone strength stability in the later stages.

This utility model discloses a cyclone scraper dust collector for a coal conveying system, including a settling tank with an outer cylinder on its upper side. An inner cylinder is fixedly connected inside the outer cylinder. The system also includes a dust removal mechanism. The dust removal mechanism includes cyclone vanes, a demister, a sludge collection hopper, a filter screen, and a wastewater collection tank. The wastewater collection tank is fixedly connected to the upper end of the settling tank. The lower end of the outer cylinder is fixedly connected to the upper end of the wastewater collection tank. A cyclone vane is rotatably connected to the upper inside of the inner cylinder. A demister is fixedly connected to the upper inside of the outer cylinder. A sludge collection hopper is fixedly connected to the lower end of the outer cylinder, extending into the wastewater collection tank. A filter screen is fixedly connected to the lower inside of the wastewater collection tank. A control switch assembly is installed outside the settling tank, with its input terminal electrically connected to an external power source. This cyclone scraper dust collector for a coal conveying system effectively collects and filters fly ash in stages, achieving good dust removal results.

This invention discloses a method for co-filling coal-fired power plant solid waste, comprising the following steps: uniformly mixing solid waste generated from thermal power plants with sodium aluminate and magnesium bicarbonate to obtain a cementitious material; uniformly mixing solid waste generated from coal mines with the cementitious material, water, and a polymer solution to obtain a filling slurry; and transporting the filling slurry to the target goaf for filling, followed by curing under natural conditions. This invention achieves for the first time the integrated and comprehensive utilization of low-value coal-fired power plant solid waste such as fly ash, desulfurization gypsum, slag, and coal gangue generated by thermal power plants and coal mines. It can effectively and safely fill goaf areas such as mine pits and shafts formed by mining, and effectively solve the problem of sustainable and comprehensive disposal of the aforementioned coal-fired power plant solid waste.

This invention discloses a high-elasticity modulus concrete and its preparation method. The high-elasticity modulus concrete comprises, by weight, cementitious materials: volcanic rock: river sand: water: water-reducing agent in a ratio of 575:990:755:115:(20-22). The cementitious materials, by weight, comprise: cement: fly ash: silica fume in a ratio of (375-435):85:55. This invention utilizes volcanic rock as coarse aggregate to construct a rigid skeleton, and incorporates cementitious materials to leverage their synergistic physical filling and volcanic ash effect, optimizing the matrix density and interfacial transition zone structure. Combined with ultrasonic-assisted mixing, it achieves uniform dispersion and efficient hydration of fine materials. This concrete exhibits high compressive strength and high elastic modulus, demonstrates low shrinkage and creep characteristics, good volume stability, and excellent durability. It is suitable for high-rise and super high-rise buildings and large-span structural engineering, significantly improving structural stiffness, saving building materials, and increasing usable space utilization.

The application relates to the technical field of green coal mining, and provides a filling slurry, an underground mining and filling synergic process and system.The filling slurry comprises: coal gangue particles, 50wt%-85wt%; an additive, 0-0.05wt%, which is used for adjusting the bleeding rate and / or the fluidity of the filling slurry; and a solvent, the balance; wherein the particle size of the coal gangue particles is less than or equal to 5 mm.The filling slurry provided by the application takes coal gangue as the main aggregate, does not need to use cement or fly ash and other cementitious materials, improves the consumption proportion of the coal gangue, reduces the filling cost, has suitable rheological properties, can be stably transported in a long-distance pipeline, and gradually solidifies in a goaf to form a filling body with certain bearing capacity.The application adopts an interval type mining and filling synergic mode, realizes effective filling of the goaf without obviously reducing the fully-mechanized mining productivity, enhances the roof stability, and has good industrial application prospect and popularization value.

The application discloses a kind of flame-retardant energy-absorbing composite material and its preparation method and application, belong to engineering protection material technical field.The flame-retardant energy-absorbing composite material includes thermoplastic elastomer SEBS 100 parts by weight and surface modified fly ash microsphere 30~150 mass parts, fly ash microsphere particle size is 5~30 μm and wherein the sum of the content of silicon dioxide and aluminum oxide is not less than 70%, under the condition of fire or flame burning, continuous dense ceramic heat insulation layer can be formed on the material surface.The application realizes the synergy of excellent flame-retardant performance and high energy-absorbing capacity by the self-flame-retardant mechanism of ceramicization of fly ash microsphere, without sacrificing the high elasticity of SEBS matrix;Meanwhile, using industrial solid waste fly ash, carbon emissions is reduced.The flame-retardant energy-absorbing composite material can be used for preparing offshore wind turbine anti-collision buffer, with the advantages of high flame-retardant grade, good energy-absorbing performance, strong marine weather resistance and green environmental protection.

This application discloses a micro-expansion low-heat silicate cement-based concrete material, its preparation method, and its application, belonging to the field of concrete engineering technology. Each cubic meter of micro-expansion low-heat silicate cement-based concrete material comprises 78-92 kg of water, 82-161 kg of micro-expansion low-heat silicate cement, 28-105 kg of fly ash, 476-608 kg of sand, and 1286-1696 kg of aggregate. The dosage of naphthalene-based water-reducing agent is 0.4 wt%-0.6 wt%, and the dosage of air-entraining agent is 0.014 wt%-0.018 wt%. The air content of the concrete material in the mixed state is 4%-5%, and the slump is 35-50 mm. Through the synergistic proportioning of water, micro-expansion low-heat silicate cement, fly ash, sand, and aggregate, the low heat of hydration and micro-expansion characteristics of micro-expansion low-heat silicate cement are fully utilized.

The application relates to the technical field of building materials, and particularly discloses a high-performance concrete composition for repairing tunnel cracks and a preparation method thereof, and the high-performance concrete composition for repairing tunnel cracks comprises the following raw materials in parts by weight: 200-220 parts of Portland cement, 40-50 parts of fly ash, 60-70 parts of mineral powder, 640-660 parts of quartz sand, 700-720 parts of gravel, 6-9 parts of a waterproof agent and 120-130 parts of water; the waterproof agent is composed of microcapsules, nano silicon dioxide and water in a mass ratio of 10-15:3-5:85-90. The high-performance concrete composition provided by the application can repair tunnel cracks and has excellent impermeability.

This invention discloses a calcined slag-fly ash based polymer mortar and its preparation method, belonging to the field of green building materials technology. The mortar is made from calcined slag, fly ash, quartz sand, a composite alkali activator, and water. The calcined slag is obtained by calcining and activating construction waste at 730-770℃, with a specific surface area ≥400 m² / kg. The mass ratio of calcined slag to fly ash is (55%-65%):(35%-45%). The composite alkali activator solution has a modulus of 1.0-1.5 and an alkali content of 9%-11% of the total mass of the cementitious materials. The preparation method includes raw material pretreatment, dry material mixing, wet mixing molding, and standard curing. This invention achieves highly efficient resource utilization of over 50% of construction waste through "dual solid waste coordination + low-alkali activation" technology, significantly reducing alkali usage (to only about 10%). The resulting mortar exhibits rapid early strength development (7-day compressive strength ≥30 MPa), high late-stage strength (28-day compressive strength ≥60 MPa), and excellent workability (flowability 160-280 mm). It can be widely used in masonry, repair, and 3D printing building materials, demonstrating significant environmental benefits and economic value.

This invention discloses a method for optimizing and controlling the heat of hydration in cast-in-place concrete for large-volume ship lock structures, comprising the following steps: adding a heat of hydration inhibitor along with the concrete and mixing it, for use in the production and preparation of heat-optimized large-volume ship lock concrete. The heat-optimized large-volume ship lock concrete, based on the mix proportion, includes 200-350 kg / m³ of cement as raw material. 3 50~80 kg / m³ of fly ash 3 Sand 800~850 kg / m³ 3 Crushed stone 900~1100 kg / m³ 3 Hydration heat inhibitor 3~5 kg / m 3 Water-reducing agent 5~9 kg / m 3 Ice-water mixture 140~180 kg / m 3 This invention optimizes the heat of hydration of concrete by incorporating a heat inhibitor into the cementitious material of the large-volume concrete of the lock, thus slowing down the heat release during hydration. This approach aims to suppress crack formation, ensure the integrity of the lock's concrete structure, and improve its durability and service life.

The present application relates to the technical field of resource utilization, and discloses a method for preparing alkali-activated concrete by using modified sulfur-containing copper tailings, which comprises the following steps: (1) pre-wetting the sulfur-containing copper tailings according to a water-to-sulfur-containing copper tailing mass ratio of 1:(4-15), and performing accelerated oxidation treatment to obtain oxidized sulfur-containing copper tailings; (2) mixing the oxidized sulfur-containing copper tailings with a slaked lime solution according to a mass ratio of 1g:(5-60ml), performing ultrasonic treatment for 1-3 hours, performing accelerated carbonization treatment after centrifugation, and drying to obtain carbonized sulfur-containing copper tailings; (3) performing ball milling on the carbonized sulfur-containing copper tailings to a size of less than 100 mesh to obtain modified sulfur-containing copper tailings; and (4) mixing raw materials according to mass parts, wherein the raw materials comprise the following components: 240-600 parts of slag, 50-100 parts of fly ash, 100-260 parts of modified sulfur-containing copper tailings, 100-300 parts of an activator, 1000-1500 parts of sand, 1000-1500 parts of stone, 10-60 parts of fiber, and 20-50 parts of water reducing agent. The present application modifies the sulfur-containing copper tailings, maximally utilizes the material properties of the sulfur-containing copper tailings, and improves the utilization rate of the sulfur-containing copper tailings.

The application discloses a geopolymer / sludge extract-based high-salt-content fly ash curing agent and a curing method. The basic principle is to utilize the synergistic hydration reaction of the geopolymer waste and cement to form more cementitious structure hydration products, promote the microstructure of the curing body to be more compact, fix heavy metals and reduce salt leaching. The curing agent comprises the following substances: cement 2-3 parts, blast furnace slag 0.5-1 part, fly ash 0.2-0.5 part and sludge extract 0.1-0.2 part. The curing method comprises the following steps: (1) mixing the curing agent with the fly ash according to the mass, adding water and stirring until uniform to obtain a mixture; (2) transferring the mixture to a mold for molding, and standard curing for 5-10 days to fully cure. The application utilizes various industrial solid wastes, the material is easy to obtain, the cost is low, the heavy metal and salt dissolution are lower than the safety landfill limit value specified by the state, and the application has good environmental benefits and engineering application value.

The application discloses a kind of based on retired wind power blade glass fiber reinforced alkali-activated zero cement solid waste heat-resistant concrete and preparation method thereof.The concrete includes slag powder, fly ash, carbonized steel slag powder, natural coarse aggregate, carbonized steel slag coarse aggregate, river sand, carbonized steel slag fine aggregate, water, alkali-activator, modified retired wind power blade glass fiber, water reducing agent and retarder;The modified retired wind power blade glass fiber is obtained by cutting, chopping, milling and screening the waste wind power blade in sequence, and then modified by NaOH solution and aminopropyl triethoxysilane solution.The application uses slag powder, fly ash, full particle size gradation carbonized steel slag and modified retired wind power blade glass fiber as raw materials, which can realize high-value recycling of solid waste, significantly reduce the cost of material preparation and reduce environmental pollution.The carbonized steel slag can enhance the radiation protection effect of the concrete through electric conduction loss and interface reflection after being mixed.

The application discloses fly ash and cement based aggregate-free high-strength concrete and a preparation method thereof, and belongs to the technical field of building materials. The concrete is made of the following raw materials in parts by mass: 50-70 parts of 42.5 grade and above Portland cement, 15-25 parts of fly ash, 15-25 parts of silica ash, 0.5-3.0 parts of high-performance composite foaming agent, and the total water-binder ratio is 0.25-0.40. The preparation method comprises the following steps: uniformly dry mixing the cementitious material and admixture, then adding water and stirring to form a slurry; uniformly mixing stable foam prepared by physically foaming the foaming agent into the slurry; and pouring and performing combined curing of standard curing and steam curing. The application controls the dry density of the concrete at 800-1600 kg / m3, and the 28-day compressive strength is stabilized at more than 10 MPa under the condition of no traditional sand aggregate, by optimizing the ratio of the ternary cementitious system of cement-fly ash-silica ash, using high-performance foam stabilizer and strictly controlling the low water-binder ratio, so that the problems of low strength and poor durability of the existing aggregate-free concrete are solved.

Non-hydraulically reactive blended particulate compositions for use in making low carbon blended cement or low carbon concrete include a pozzolanic component having a first D90 and a mineral filler component having a second D90 greater than the first D90 dry blended without intergrinding, wherein the composition is free of hydraulic cement. The pozzolanic component can have a D90 less about 45 μm and the mineral filler can have a D90 greater than about 45 μm. The pozzolanic material can be fly ash, bottom ash, metallurgical slag, silica fume, metakaolin, volcanic ash, natural pozzolan, calcined shale, calcined clay, and / or ground glass. The mineral filler component can be aggregate fines, quarry fines, limestone powder, granite fines, stone dust, rock dust, marble dust, mine tailings, pulverized bottom ash, pulverized metallurgical slag, ground recycled concrete, pulverized shale from shale oil extraction, or pulverized sand from tar sand extraction.

The present application relates to wastewater treatment technical field, especially a kind of mine underground sludge processing device, including compost bed, rack and water pump, rack is located in the side of compost bed: the inner side upper end of the rack is provided with screw rod structure, the one side of the conical barrel is fixed with support frame, the inner side of the support frame is fixed with containing box, fly ash slurry is contained in containing box, the inner side upper end of the push plate is provided with the flow channel of L type, the flow channel is communicated with containing box interior by conveying pipe, and electric control valve is provided on conveying pipe. The present application injects sludge into compost bed, after standing, the liquid in upper layer is extracted, and the extracted water is preliminarily treated, then, fly ash slurry is slowly introduced into the sludge in lower layer, so as to reduce the viscosity of sludge, in the process of aeration heating, the particles of transition layer are successfully floated to the surface of sludge for collection by virtue of micro-bubble adsorption, and the preliminary treatment of underground collected sludge is completed.

This invention relates to the field of mine backfilling applications, specifically to a CO2-solidified industrial solid waste-based slurry for mine backfilling, comprising the following raw materials in parts by weight: 85-105 parts solidifying agent, 15-22 parts sludge, 3-5 parts construction waste particles, 5-10 parts amine-functionalized porous material, 1.2-2.4 parts municipal solid waste particles, 0.5-2.5 parts rheology modifier, 0.1-0.5 parts setting regulator, and 0.1-0.5 parts defoamer; the solidifying agent, by weight percentage, includes 25-35 parts ettringite, 2-12 parts yellow phosphorus slag, 3-8 parts phosphogypsum, 4-16 parts modified fly ash, 3-10 parts desulfurized gypsum, 2-5 parts steel slag, and 3-5 parts tailings. By optimizing the solid waste combination and activation process, the slurry can actively adsorb / mineralize CO2 during the backfilling and solidification process, achieving the dual goals of increasing the strength of the backfill and reducing carbon emissions.

The application discloses a method for constructing an internal dumping site based on a fly ash-based cementing material carbon dioxide storage, and utilizes the cementing properties of fly ash of a pit mouth coal-fired power plant to prepare a fly ash-based cementing material with super high content, and utilizes the high-strength fly ash-based cementing material to construct a carbon dioxide storage, and utilizes a cement-free low-strength fly ash-based cementing material to backfill an open-pit mine pit, so that the resource utilization and efficient collaborative disposal of fly ash solid waste are realized; the carbon dioxide storage is constructed in the internal dumping site space, the open-pit mining space is effectively utilized, and the problem of insufficient material for land reclamation backfilling in the late mining stage is solved; the carbon dioxide storage reinforced by the anchor rod prestress has high strength and large internal space, the mine pit bottom plate impermeable layer and the overlying clay cover layer increase the airtightness, and the safe and efficient large-scale storage of critical state carbon dioxide is realized; the fly ash-based cementing material can mineralize carbon dioxide in a humid environment, increases the carbon dioxide storage amount, and improves the carbon dioxide storage strength and airtightness.

This invention proposes a high-performance concrete with copper slag and its preparation method, belonging to the technical field of concrete materials, to solve the technical problems of copper slag accumulation, low solid waste utilization rate, and high carbon emissions and costs in the cement industry. The high-performance concrete with copper slag of this invention comprises the following raw materials in parts by weight: 250-450 parts cement, 170-190 parts water, 750-800 parts sand, 930-950 parts aggregate, 45-150 parts copper slag, 15-100 parts mineral admixtures, and 1.5-5 parts activity activator. This concrete uses copper slag combined with other mineral admixtures. By controlling the amount and specific surface area of ​​copper slag, and introducing sodium sulfate as a copper slag activity activator, the early hydration reaction rate of copper slag and the mechanical properties of the concrete are effectively improved. Its compressive strength reaches 44-45 MPa and its splitting tensile strength reaches 4.1-4.5 MPa after 28 days of standard curing. This invention significantly reduces cement usage and production costs, and substantially reduces carbon emissions, while ensuring excellent mechanical properties of concrete. It provides a new approach for the high-value-added resource utilization of industrial solid wastes such as copper slag and fly ash. Moreover, the preparation process is simple and suitable for large-scale promotion and application.

This invention discloses a series-parallel hoisting system for multi-compartment pumps in a dust collector, belonging to the field of ash conveying technology for dust collectors in thermal power plants. It includes an ash conveying header and several sets of ash conveying units. Each set of ash conveying units is connected to the header and used to transport fly ash from the other sets of units to the header, where it is collected and discharged. Each ash conveying unit includes an ash conveying pipe and several sets of ash conveying devices. The ash conveying devices are connected in series via the ash conveying pipe. Each ash conveying device includes a receiving component and a conveying component. Compensation components are provided between the receiving component and the conveying component, or between the conveying component and the conveying pipe, to absorb thermal displacement. This multi-compartment pump series-parallel hoisting system effectively solves the problems in existing technologies where multiple compartment pumps are connected in series via ash conveying pipes, resulting in different thermal displacements in different ash hoppers, leading to deformation or even damage to the conveying pipes or pumps; and also addresses the low ash conveying efficiency.

This invention discloses a high-friction, low-thermal-conductivity prestressed concrete pipe pile processing device, belonging to the field of concrete pipe pile processing technology. The device includes a mold, a drive unit, and a connecting shaft. It also includes a mixing mechanism comprising a mixing paddle and a telescopic mechanism. The telescopic mechanism drives the mixing paddle to move radially along the mold, and the mixing paddle mixes the concrete raw materials inside the reinforcing cage. A moisture content meter detects the real-time moisture content of the concrete raw materials. When the real-time moisture content is less than a threshold value, the controller controls the telescopic mechanism to contract, so that the distance from the sidewall of the mixing paddle to the axis of the connecting shaft is equal to the designed inner diameter of the pre-processed pipe pile, and the length direction of the mixing paddle is parallel to the axial direction of the mold. This high-friction, low-thermal-conductivity prestressed concrete pipe pile processing device can suppress the segregation of fly ash hollow microspheres, avoid powder shedding from the inner wall, and increase the friction of the processed pipe pile.

The application discloses a yellow flood area soil solidifying agent and a use method thereof, and the yellow flood area soil solidifying agent comprises the following raw materials in parts by weight: 40-70 parts of blast furnace slag, 5-20 parts of fly ash, 10-20 parts of lime, 10-20 parts of ordinary Portland cement, 10-20 parts of dust removal ash, 0.5-2 parts of fatty alcohol polyoxyethylene ether and 0.5-2 parts of nano silicon dioxide. The soil solidifying agent is low in price, has a remarkable reinforcing effect on the yellow flood area soil body, can effectively solve the problem of reduction and utilization of a large amount of solid waste, can reduce the cost of solidifying the yellow flood area silt, and has remarkable economic benefits and environmental protection benefits.