76 results about "Pozzolana" patented technology

The invention relates to a multi-component composite modified geopolymer material and a preparation method thereof, and aims to solve the problems of high brittleness, easiness in cracking and poor durability of a traditional geopolymer. According to the material, industrial solid wastes (carbonized steel slag, volcanic ash and the like) are used as main matrixes, a macroscopic anti-cracking framework is constructed through red copper fibers, micropores are nanofilled with CVD silicon oxide substrate graphene, and polyamide resin flexibly buffers stress, so that a cross-scale reinforcing system is formed. The preparation method adopts a solid phase premixing-liquid phase excitation-gradient compounding process, and functional components are doped in sections, so that the dispersity and constructability are guaranteed. The technical effects are obvious: the breaking strength is reached, the splitting tensile strength is obviously improved, the mass loss rate is obviously reduced after freezing and thawing for 100 times, and the shrinkage crack self-limit is within 50 [mu] m. The carbon emission of the material is greatly reduced, the high-durability standard is met, and the material is suitable for severe environmental engineering.

The invention discloses an efficient consolidation agent for tailings in an underground mine filling mining method and a preparation method thereof, and relates to the technical field of consolidation agents, the consolidation agent is prepared from a gelling base material, a nano reinforcing agent, a chemical exciting agent and an organic fiber reinforcing agent according to a specific mass ratio; aiming at the problems of unstable volume, insufficient strength and the like of a traditional consolidation agent, through high-temperature calcination of the steel slag to eliminate harmful components, dealkalization treatment of the red mud, acid activation of the phosphogypsum and volcanic ash reaction of the fly ash, the volume stability and the gelling activity of a filling body are remarkably improved, and the consolidation agent is suitable for complex underground environment requirements; aiming at the pain points of low early strength, weak interface bonding and the like of the consolidation agent, the cohesion is improved by strong bonding of the surface-modified nano SiO2 and a gelling base material, a chemical exciting agent is added to cooperate with CO2 carbonization to generate nano crystal nucleuses, hydration sites are provided, a pore structure is optimized, bleeding is inhibited, the fluidity and stability of slurry can be effectively improved, and the consolidation effect is good. And the requirements of underground filling homogeneity and pumpability are met.

The invention provides a preparation method of a steel-polymer fiber continuous composite fiber reinforced alkali-activated pozzolanic concrete material, which comprises the following steps: carrying out gum dipping treatment on steel fibers, winding carbon fiber yarns on the gum-dipped steel fibers to obtain wound composite fibers, coating the surfaces of the composite fibers with a molten-state active porcelain glaze coating, drying, curing and cutting to obtain the steel-polymer fiber continuous composite fiber reinforced alkali-activated pozzolanic concrete material. The steel-polymer fiber continuous composite fiber is obtained; sequentially adding the coarse aggregate, the natural volcanic ash, the fine aggregate, the steel-polymer fiber continuous composite fiber, the water reducing agent and the exciting agent, and performing pouring, standard curing and specified testing. The material is good in tensile strength and crack resistance and effectively adapts to various severe and complex engineering environments, and the durability is improved. The concrete has good adhesion, can ensure that the load can be uniformly transmitted when the concrete is subjected to an external load, avoids the internal stress concentration and damage of the concrete, and greatly improves the compressive strength of the concrete and the integrity of a structural member.

The present disclosure provides methods and compositions of building materials for carbon sequestration. The compositions include magnesium oxide or magnesium hydroxide, a lime material comprising a calcium oxide and / or a calcium hydroxide; and a pozzolan comprising at least one material selected from the group consisting of ash (e.g., rice husk, coconut, ceramic), fly ash, vitrified calcium aluminio-silicate, blast furnace slag, ground granulated blast-furnace slag (GGBFS), zeolites, diatomaceous earth, silica fume, amorphous aluminosilicate, glass phase pozzolan, fume silica, metakaolin, calcinated diatomaceous earth, biochar, geopolymers, kaolinitic clays, volcanic ash, silica fume, pozzolanic lime, precipitated silica, carbon nanotubes, calcinated silicate pozzolan, synthetic pozzolan, pozzolan powders (e.g., glass, brick). The disclosure also provides methods for absorbing carbon dioxide using the disclosed building material.

The present disclosure is directed to a method for forming calcined pozzolan that includes: performing a gravity separation on coal refuse to separate an organic component from an inorganic component including crystalline shale; and converting the crystalline shale to a calcined pozzolan. The present disclosure also directed to a calcined pozzolan, concrete, a method of producing concrete, and a method for cleaning a landfill site.

It has been unexpectedly discovered that the addition of a natural or other pozzolan to non-spec coal ash significantly improves the properties of the non-spec coal ash to the extent it can be certified under ASTM C618 and AASHTO 295, as either a Class F or Class C coal ash. The natural pozzolan may be a volcanic ejecta, such as pumice or perlite. Other pozzolans may also be used for this beneficiation process. Many pozzolans are experimentally tested and may be used to beneficiate non-spec coal ash into certifiable Class F coal ash. Additionally, this disclosure provides a method of converting a Class C coal ash to a more valuable Class F coal ash. This discovery will extend diminishing Class F coal ash supplies and turn non-spec coal ash waste streams into valuable, certified coal ash pozzolan which will protect and enhance concrete, mortars and grouts.

It has been unexpectedly discovered that the addition of a natural or other pozzolan to non-spec coal ash significantly improves the properties of the non-spec coal ash to the extent it can be certified under ASTM C618 and AASHTO 295, as either a Class F or Class C coal ash. The natural pozzolan may be a volcanic ejecta, such as pumice or perlite. Other pozzolans may also be used for this beneficiation process. Many pozzolans are experimentally tested and may be used to beneficiate non-spec coal ash into certifiable Class F coal ash. Additionally, this disclosure provides a method of converting a Class C coal ash to a more valuable Class F coal ash. This discovery will extend diminishing Class F coal ash supplies and turn non-spec coal ash waste streams into valuable, certified coal ash pozzolan which will protect and enhance concrete, mortars and grouts.

A method of preparing an acid modified pozzolan may include: contacting a starting pozzolan with an acid to form a mixture of the starting pozzolan and the acid; reacting the mixture of starting pozzolan and the acid during an induction period to form reaction products; and recovering the acid modified pozzolan.

USE OF A MARL FOR THE PREPARATION OF A POZZOLANIC MATERIAL The present invention relates to the use of a marl comprising: more than 45% calcite; and at least 1% kaolinite; for the preparation of a pozzolanic material.

The invention belongs to the technical field of industrial solid waste recycling and filling materials, and particularly discloses a method for improving pozzolanic activity of water-quenched copper slag through synergistic modification of magnetic separation iron removal, which comprises the following steps: adding CaO into molten copper slag discharged in a copper smelting process, uniformly mixing, reacting in an oxygen-containing atmosphere, and then carrying out water quenching and quenching to obtain the pozzolanic activity of the water-quenched copper slag. Modified copper slag particles are obtained; the modified copper slag particles are subjected to wet grinding and drying, and modified copper slag powder is obtained; and the modified copper slag powder is subjected to magnetic separation, and magnetic iron ore concentrate and non-magnetic tailings are obtained. The prepared non-magnetic tailings replace part of cement to prepare the auxiliary cementing material with high pozzolanic activity. Through the synergistic effect of CaO modification and a magnetic separation iron removal process, the pozzolanic activity of the water-quenched copper slag is remarkably improved. The method is simple and convenient in process, the high value-added application way of the water-quenched copper slag is effectively widened, the resource utilization rate is increased, and the method has important significance on promoting comprehensive utilization of solid waste and environmental protection.

The application discloses a mine filling solidified material prepared from domestic waste incineration fly ash and a preparation method thereof, and relates to the technical field of waste recycling and reuse, and comprises the following raw materials in mass fractions: 25-35 parts of filling solidified agent, 18-24 parts of coarse tailings, 12-16 parts of fine tailings, 7-9 parts of deionized water and 0.3-0.6 parts of fly ash modifier. On the basis of fly ash harmless treatment, the performance and strength of the filling slurry are improved by adding the fly ash modifier, so that the fly ash can be effectively applied in mine filling, the fly ash landfill and secondary pollution problems are reduced, and under the complex solubilization effect, more calcium silicate hydrate is formed in the hydration process of the fly ash modifier in the filling solidified agent, and the hydration reaction of the mineral powder and the harmless fly ash is promoted. Through the volcanic ash activity excitation effect of nano silica ash and the micro aggregate filling effect of the floating beads, the compressive strength of the filling body is improved.

The invention provides a method for preparing a pozzolanic material. The method comprises the following steps: collecting waste glass; crushing the waste glass into waste glass particles with a preset size; and grinding the waste glass particles to obtain fine ground glass micro powder with a preset particle size and preset particle size distribution, and taking the fine ground glass micro powder as the pozzolanic material. The invention also provides a pozzolanic material prepared by the method, and a product manufactured by utilizing the pozzolanic material.

Fertiliser granules comprise a pozzolanic material and a biochar. Suitably, the pozzolanic material is poultry litter ash, meat and bonemeal ash, wood ash, rice husk ash, or olive stone ash. The bioch

The invention relates to the technical field of stirring and mixing, in particular to a mixing device for volcanic ash silty clay improved filler, which comprises a mixing box and a stirring mechanism arranged in the mixing box and used for mixing materials, the feeding opening is formed in one side of the top end of the mixing box and used for feeding, the discharging opening is formed in the bottom of the end, away from the feeding opening, of the mixing box, and the two ends of the stirring mechanism penetrate through the two ends of the side wall of the mixing box correspondingly; a driving assembly for driving the stirring mechanism to rotate and a bearing assembly for supporting the stirring mechanism are arranged at the two ends of the side wall of the mixing box respectively, one end of the stirring mechanism penetrates through the bearing assembly, and a reciprocating assembly is arranged at the end, penetrating through the bearing assembly, of the stirring mechanism; the stirring mechanism is composed of a first stirrer and a second stirrer, and the problems that due to the fact that an existing double-shaft stirrer is axially fixed, materials such as volcanic ash powder clay are locally stirred insufficiently, and then the mixing quality and the production efficiency are affected are solved.

The invention discloses a polymer bentonite composite anti-seepage material, relating to the technical field of anti-seepage materials, comprising the following raw materials by weight: 3-5 parts of bentonite, 0.2-0.4 parts of amphoteric organic ion salt monomers, 0.1-0.2 parts of a cross-linking agent, 0.05-0.1 parts of a cage-type silsesquioxane containing vinyl and epoxy groups, 0.06-0.12 parts of a reactive beta-cyclodextrin quaternary ammonium salt, 0.05-0.1 parts of an alkoxy-containing monomer, 0.5-0.8 parts of volcanic ash, 0.1-0.3 parts of nanofibers, 0.05-0.08 parts of sodium tripolyphosphate, 0.005-0.01 parts of an initiator, 0.01-0.03 parts of 2,3-quinolinedicarboxylic acid, and 10-20 parts of water. The material has significant anti-seepage effect, good resistance to dry-wet cycles, good acid, alkali, and salt resistance, sufficient performance stability, and long service life.

Described herein are processes for the activation of glass pozzolan as well as the activated product. Methods of using the activated product are also described.

The application discloses a color difference control method of a Mini LED PCB, which comprises a volcanic ash grinding plate consistency treatment and a printing consistency treatment, the volcanic ash grinding plate consistency treatment comprising: treating a PCB substrate by using a modified volcanic ash solution in combination with grinding and brushing, and the preparation method of the modified volcanic ash comprising: after the volcanic ash is finely ground, acidizing treatment is performed, then water washing, drying, immersion in a water-soluble cellulose ether water suspension, steaming after the immersion is completed, flushing off the surface material of the volcanic ash, and drying; the printing consistency treatment comprising: spraying a silane solution on the edge of a silk screen plate, and performing anti-solder silk screen printing after drying. The volcanic ash grinding plate consistency treatment can obtain a roughness with good uniformity on the surface of the substrate, and the water washing in combination with acetic acid cleaning can effectively remove impurities on the surface of the plate; then the printing consistency treatment can reduce the influence of ink accumulation on the edge of the silk screen plate on the uniformity of ink printing, and the above operation can comprehensively control the color difference of the PCB, and the process is simple.

The invention discloses a Ca / Mg / Si gel system-based micro-nano suspension for reinforcing earthen ruins and a preparation method thereof, and belongs to the technical field of building materials. The micro-nano suspension comprises the following components: calcium hydroxide, magnesium hydroxide, a siliceous volcanic ash material, a dispersing agent, a water reducing agent and water. According to the invention, a Ca / Mg / Si gelling system is constructed to form a bimodal distribution particle characteristic mainly comprising micro-nano particles, so that the particle stability and the storage timeliness of the suspension are remarkably improved. The suspension liquid generates nanoscale spherical hydrated magnesium silicate (M-S-H) gel through a hydration reaction, a permeation migration mechanism of'small-particle-size raw materials-nano products-spherical migration units' is established, deep permeation and diffusion in the earthen ruins are achieved, the surface hardness of the earthen ruins can be effectively improved, and the surface hardness of the earthen ruins is improved. And the capability of resisting a complex erosion environment is obviously enhanced.

The invention relates to a volcanic ash stratum diaphragm wall grooving construction method, and relates to the technical field of diaphragm wall construction. The construction method comprises the steps that a construction site is selected, a groove is excavated according to the preset guide wall depth, and after the groove is excavated, concrete is poured on the top face to form a guide wall; the preparation method comprises the following steps: determining the slurry ratio through experiments, stirring 8-12 parts by weight of bentonite, 0-0.05 part by weight of carboxymethyl cellulose and 0-0.5 part by weight of sodium carbonate at a high speed for 6-8 minutes by using a slurry stirrer, and storing for more than 24 hours to fully expand the bentonite; unit groove sections are divided, slurry is injected into the guide wall, and the underground diaphragm wall is excavated in a segmented mode to form grooves; and the reinforcement cage is assembled and formed at a time, and the reinforcement cage is hoisted and put into the groove. The construction stability of volcanic ash stratum diaphragm wall grooving can be guaranteed, and potential risks and influences are reduced.

To provide a suspension / solution simultaneous composite injection excellent in permeability, strength, water cut-off properties, etc.SOLUTION: By using an injection material composed of a suspension containing suspended particles composed of one or more kinds of silica particles of sintered silica and natural sintered silica having pozzolanic action and a silica solution, the separated silica solution separated from the suspension permeates into a region into which the suspended particles cannot permeate with permeability into the fine-grained soil and is then gelled. In the ground improvement method, silica particles are set to a prescribed Blaine value and a prescribed blending amount, the silica sol is set to silica colloid and / or prescribed water glass, the separated silica sol is set to a prescribed silica concentration, the separated silica sol has a self-supporting strength of a homogel and a sand gel, and the separated silica sol connects the solidified bodies of the suspended particles to form a solidified body having a high-concentration solidified region and a low-concentration solidified region from the center toward the outside.SELECTED DRAWING: None

The invention discloses a volcanic ash stratum large-diameter large-gradient ultra-shallow buried shield launching construction method which comprises the following steps: S1, construction preparation: checking tunnel buried depth H, underground water buried depth and gradient parameters; s2, building envelope construction is conducted, and plain concrete water stop piles and plain underground diaphragm walls are sequentially constructed; s3, stratum reinforcement is conducted, specifically, the stratum around the hole is reinforced through high-pressure jet grouting piles; s4, back pressure construction is conducted, and solidified soil is backfilled at the top of the shield; s5, tunnel portal sealing is conducted, specifically, double curtain cloth and a tunnel portal sealing device are installed, and grouting is conducted on a sealing cavity; and S6, shield launching is conducted, specifically, a shield is started, and ground surface settlement is monitored in real time. According to the technical scheme, the reliability of the volcanic ash stratum component when the large-diameter, large-gradient and shallow-buried tunnel is constructed is improved.

The invention provides a method for evaluating the volcanic ash activity of a silicon-aluminum material. The method comprises the following steps: determining the content of an amorphous phase in the silicon-aluminum material by adopting an X-ray diffraction method and a Rietveld full spectrum fitting method; the silicon-aluminum material and Ca (OH) 2 are mixed and stirred and then cured, after curing is finished, crushing is conducted, hydration is stopped, and a thermogravimetric or muffle furnace calcination method is adopted to obtain the consumption of Ca (OH) 2; when the content of the amorphous phase is greater than or equal to 25% and the consumption of the Ca (OH) 2 is greater than or equal to 60mg, the silicon-aluminum material has high pozzolanic activity. The method is beneficial to shortening the evaluation period of the volcanic ash activity of the silicon-aluminum material, is beneficial to understanding the mechanism of the reaction process of the silicon-aluminum solid waste, further finds out an adaptive building material utilization way, and solves the problems that the utilization way is unknown and the exploration process is difficult at the present stage.

The invention belongs to the technical field of building materials, and particularly relates to concrete with high light volcanic ash content and a preparation method of the concrete. According to the high-strength lightweight concrete provided by the invention, the balance of light weight and high strength is realized by adjusting the composition of the raw materials, and meanwhile, the high-strength lightweight concrete has excellent durability, workability and environmental protection performance. Capillary pores in the concrete can be further filled through the volcanic ash effect and the micro aggregate filling effect of the volcanic ash, and the microstructure of an interface transition area is improved, so that the compressive strength of the concrete is improved; the dextran-acrylic resin emulsion is added, so that the chloride ion penetration resistance of the concrete is improved, the durability of the concrete is enhanced, the flexibility and crack resistance of the concrete are improved, and cracks in the construction and use processes are reduced.

The present invention provides a method for preparing a pozzolanic material, which includes the following steps: collecting waste glass; crushing the waste glass into waste glass particles having a predetermined size; and grinding the waste glass particles to obtain finely ground glass powder having a predetermined particle size and a predetermined particle size distribution for serving as the pozzolanic material. The present invention further provides a pozzolanic material prepared by the method, as well as a product manufactured using the pozzolanic material.

Disclosed are a natural mineral-derived Lumilite ecological restoration agent, including 65-75 wt % of clinoptilolite, 5-15 wt % of kaolinite, 3-10 wt % of montmorillonite, 2 wt % of laumontite, 2 wt % of perlite, 0.1 wt % of light rare earth, 0.01 wt % of neodymium, 0.01 wt % of dysprosium, 1-2 wt % of quartz, 5-9 wt % of pozzolan, 2-3 wt % of elvan, and equal proportions, 0.002-0.0033 wt %, of freeze-dried Dioscorea polystachya, freeze-dried polyglutamic acid (PGA), and freeze-dried palm sap, and a method of manufacturing the same, making it possible to protect water resources by preventing a rapid pH decrease in target water bodies, removing heavy metal toxicity of aluminum that is a cause of dementia, and preventing economic losses and serious reductions in ecological resilience, and to restore and maintain clean and safe first-class water quality in natural water bodies such as rivers, lakes, drinking water supply dams, groundwater, and the like.

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.

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, steel 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.

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, steel 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 invention discloses a fireproof environment-friendly decorative plate containing an antibacterial coating, and relates to the technical field of decorative plates. (2) a multi-layer composite decorative layer; the core layer is formed by mixing magnesium oxide, magnesium chloride, volcanic ash, bentonite and a cellulose reinforcing agent in a dry mode, mixing the mixture with a magnesium chloride solution to form slurry, and conducting continuous rolling forming and high-temperature curing; the antibacterial coating is formed by mixing a waterborne polyurethane dispersion and a nano-hydroxyapatite-silver copper ion composite antibacterial agent according to the mass ratio of 100: 3 and carrying out low-temperature plasma surface activation and curing. Through the volcanic ash-MgO secondary hydration composite core layer, a compact C-S-H network is generated, the fire-resistant strength and toughness are improved, the problem that a magnesium oxide board is insufficient in strength and durability is solved, the bending strength and the impact toughness are improved, and the B1 fireproof grade is achieved.

The invention provides a preparation and proportioning optimization method of solid waste non-sintered ceramsite, and relates to the field of green building materials. Red mud, coal gangue and fly ash have a synergistic effect through a volcanic ash effect, so that the strength of the ceramsite is remarkably improved; the silica fume and the quick lime further enhance the activity of the raw materials and realize multi-component synergistic excitation; in the mix proportion design of the unfired ceramsite, a single-factor test is a basic link for determining the mixing amount range of each raw material, and a reasonable interval of key factors can be preliminarily identified by adjusting single variables one by one and testing performance indexes of the single variables; performing mix proportion optimization design in combination with a response surface method; the raw material mixing amount range is rapidly screened through factor tests, the multi-factor interaction effect is analyzed through a Box-Behnken response surface method, a quadratic regression model is established, and precise optimization of the ceramsite performance is achieved; by adopting an unfired process and a natural curing mode, high-temperature sintering is avoided, and energy consumption and carbon emission are remarkably reduced.