335 results about "Vermiculite" patented technology

The invention discloses a preparation process of a soil conditioner and application of the soil conditioner in soil improvement, and the preparation process comprises the following steps: S1, preparation of pretreated biomass; s2, preparation of composite biochar; s3, preparation of sulfhydrylated biochar; s4, preparing the modified composite biochar; and S5, uniformly mixing the modified composite charcoal, kaolin, humic acid, fly ash, slaked lime and vermiculite to obtain the soil conditioner. According to the soil conditioner, modified composite biochar prepared through specific functionalization is blended with kaolin, humic acid, fly ash, slaked lime and vermiculite according to a certain proportion, and the prepared soil conditioner has unique advantages in the aspects of improving soil organic matter, fixing carbon, providing microelements and especially regulating and controlling the activity of soil microorganisms; advanced complementation and synergistic interaction of all the components are achieved, and the comprehensive treatment requirement of complex degraded soil can be better met.

The invention provides a salt-tolerant plant constructed wetland system for treating eutrophicated mariculture wastewater, which specifically comprises a lower filler formed by mineral materials, and a middle filler formed by modified zeolite, sodium alginate coated vermiculite, rice husk charcoal, oyster shell, coral sand and diatomite, the surface filler is composed of intertidal zone bottom mud, intertidal zone raw water, coastal saline-alkali soil and composite algae powder, and the three fillers are combined with salt-tolerant plant breeding, bow-shaped water flow optimization and layered collaborative design; the core problems of poor salt tolerance, low adsorption efficiency, easiness in blockage, high maintenance cost and the like of the traditional constructed wetland during treatment of the mariculture wastewater are systematically solved.

The invention relates to the technical field of soilless culture substrates, in particular to a soilless culture substrate based on biochar and mushroom dreg resource utilization and a preparation method and application of the soilless culture substrate. The soilless culture substrate comprises the following raw materials in parts by mass: 30-50 parts of mushroom dregs, 20-30 parts of charcoal, 10-15 parts of vermiculite, 8-12 parts of perlite, 5-10 parts of humic acid and 2-5 parts of trace elements. The soilless culture substrate can effectively utilize biochar and mushroom dreg resources, provides a good physical environment and sufficient nutrient supply for plant growth, improves the stress resistance and yield quality of plants, reduces dependence on traditional non-renewable substrate resources, and reduces the pressure of agricultural wastes on the environment.

The invention provides a special cow dung organic fertilizer for saline-alkali soil and a preparation method thereof, and the preparation method specifically comprises the following steps: 1, carrying out mixed fermentation on a cow dung substrate and compound bacterial powder, 2, adding modified charcoal and salt-tolerant bacterial powder, mixing and decomposing, 3, mixing and granulating with desulfurized gypsum-vermiculite-quartz sand micro-powder, humus soil and trace elements, and 4, carrying out granulation on the granules to obtain the special cow dung organic fertilizer for saline-alkali soil. The special cow dung organic fertilizer for saline-alkali soil is obtained; through a multi-strain synergistic fermentation process, modified functional material compounding and stage temperature-controlled decomposition, the defects of an existing saline-alkali soil modifier in the aspects of microbial activity, nutrient release efficiency, soil structure remediation and the like are overcome.

The invention belongs to the technical field of PVC auxiliaries, and particularly relates to a compounding method of a PVC environment-friendly stabilizer, which comprises the following steps: cleaning expanded vermiculite, sequentially depositing titanium dioxide and calcium-zinc ions, then obtaining calcium-zinc stearate modified expanded vermiculite through a spraying reaction of sodium stearate, and finally mixing with an antioxidant, a lubricant, an auxiliary stabilizer and an ultraviolet absorbent to obtain the PVC environment-friendly stabilizer. The PVC environment-friendly stabilizer is obtained. The defects of an existing stabilizer are overcome, the porous structure of expanded vermiculite is used as a frame, zinc stearate and calcium stearate are fixed to the surface in an in-situ fixing mode, and the zinc stearate and calcium stearate composite stabilizer has the advantages of being not prone to precipitation and good in stabilizing effect.

The invention relates to the technical field of soil remediation and fertilizer preparation, and discloses a soil remediation fertilizer and a preparation method thereof.The soil remediation fertilizer is formed by compounding a pre-fermented organic matrix and a function activation component, and the organic matrix comprises chicken manure, corn straw, fermented sesame cake powder and traditional Chinese medicine residue powder; a stable organic fertilizer matrix is obtained through high-temperature composting fermentation; the function activation component comprises freeze-dried saccharomyces cerevisiae embedded by chitosan-baking soda, a pineapple peel crude extract, polyglutamic acid, yeast cell walls, fulvic acid, trace mineral substances, microporous vermiculite and the like. After the fertilizer is applied into soil, the embedded flora and the slow-release carbon source are activated through soil moisture and an acid-base environment, the rhizosphere in-situ re-fermentation process is triggered, and the synergistic remediation function of continuous nutrient release, micro-ecological regulation and soil structure improvement is achieved. The product provided by the invention has the advantages of composite structure, synergistic function, controllable activation condition, good ecological adaptability and popularization value.

The invention relates to the technical field of building materials, in particular to a cementing material for a fabricated wall prepared from multi-element solid waste and a preparation method of the cementing material. The preparation method comprises the following steps: 25-55 parts of fly ash, 25-65 parts of blast furnace slag, 8-10 parts of lime, 1-5 parts of desulfurized gypsum, 3-6 parts of a first mixture, 2-5 parts of a second mixture and 5-8 parts of an alkali activator; the mass ratio of the metakaolin to the bentonite to the superfine calcium carbonate in the first mixture is 3: 2: 1; the mass ratio of the vermiculite to the expanded perlite to the glass beads in the second mixture is 2: 2: 1. Through the synergistic excitation effect of Ca < 2 + > and Na < + > and the addition of the first mixture and the second mixture, the cementing material forms a more stable microstructure. A hydration product SEM figure shows that C-S-H and C (N)-A-S-H gel are symbiotic to form a three-dimensional network, pores are filled with needle-like ettringite crystals, and in combination with the brucite phase anchoring effect, the mechanical properties, such as strength and durability, of the material are remarkably improved.

The invention discloses organic nutrient soil and a manufacturing method thereof.The organic nutrient soil is prepared from, by weight, 25-30 parts of leaf mold, 20-25 parts of peat soil, 12-15 parts of perlite, 10-12 parts of vermiculite, 20-25 parts of organic fertilizer and 3-5 parts of biological inoculant.The organic nutrient soil contains abundant organic matter, nitrogen, phosphorus, potassium and other macroelements and multiple medium trace elements, the biological inoculants are added at the same time, and the organic nutrient soil has the advantages that the organic nutrient soil is rich in organic matter, nitrogen, phosphorus, potassium and other macroelements; the nutrient requirements of different plant growth stages can be met, healthy and strong growth of plants is promoted, and the stress resistance and quality of the plants are improved; by reasonably matching the raw materials such as the leaf mold, the peat soil, the perlite and the vermiculite, the nutrient soil has good air permeability, water drainage, water retention and looseness, soil hardening is effectively prevented, and a suitable growth environment is provided for plant roots; the manufacturing method is simple, is simple in process, is convenient to operate, does not need complex equipment and technologies, and is easy for large-scale production, popularization and application.

The invention relates to the technical field of vermiculite board production, in particular to full-automatic high-pressure vermiculite board forming equipment and a production method. The full-automatic high-pressure vermiculite board forming equipment comprises a hydraulic machine provided with a workbench, a middle lifting frame and a lifting seat, and further comprises a mold, the lower die base is installed on the upper table top of the workbench, the die frame is installed on the inner side of the middle lifting frame, and the upper die base is installed on the bottom face of the lifting base. The feeding and discharging device is provided with a supporting table with supporting legs, a feeding box with openings in the upper portion and the lower portion, a pushing frame and a driving mechanism, and the feeding box is located on the upper table top of the supporting table; the driving mechanism comprises two groups of elastic telescopic push rods correspondingly connected with the feeding box and the pushing frame respectively, and linear driving equipment for synchronously applying force to the two groups of elastic telescopic push rods; by means of the feeding and discharging device, full-automatic operation from raw material filling to finished product taking is achieved, the requirement for manual intervention is greatly reduced, the production period is shortened, and the operation efficiency of the whole production line is improved.

The invention discloses an air purification composition capable of generating negative oxygen ions. The air purification composition is prepared from the following raw materials in parts by weight: 800 to 1000 parts of pine needle extract powder, 87 to 107 parts of cacumen biotae extract powder, 58 to 68 parts of perilla frutescens extract powder, 58 to 68 parts of lucky tree extract powder, 58 to 68 parts of cactus extract powder, 58 to 68 parts of ampelopsis grossedentata leaf extract powder, 25 to 40 parts of biotite powder and 170 to 230 parts of expanded vermiculite powder. The attapulgite-sepiolite-rectorite composite material is prepared from the following components in parts by weight: 170 to 230 parts of attapulgite powder, 170 to 230 parts of sepiolite powder, 170 to 230 parts of rectorite powder and 30 to 40 parts of vinasse powder; the negative oxygen ion generator can effectively release negative oxygen ions, has the advantages of being environmentally friendly, safe, healthy and the like, can decompose indoor pollutants such as formaldehyde and ammonia, and plays an important role in purifying the indoor environment and reducing pollution.

The invention provides a biological organic fertilizer and a preparation method thereof. The biological organic fertilizer is prepared from the following raw materials in parts by weight: 10 to 15 parts of rice husk, 8 to 12 parts of peanut shell, 10 to 15 parts of bagasse, 15 to 20 parts of straw, 20 to 25 parts of livestock manure, 5 to 10 parts of pond sludge, 3 to 5 parts of plant ash, 5 to 10 parts of oil meal, 5 to 10 parts of ammonium phosphate, 2 to 5 parts of low-temperature complex microbial inoculants, 3 to 6 parts of seaweed oligosaccharide, 5 to 10 parts of modified vermiculite powder and 10 to 20 parts of photothermal conversion microspheres. According to the invention, waste is taken as a basic raw material and is matched with ammonium phosphate to rapidly supplement available nutrients, and meanwhile, the low-temperature complex microbial inoculant, the modified vermiculite powder and the photothermal conversion microspheres are introduced to form a synergistic interaction system. Vermiculite powder is modified, so that the nutrient adsorption and slow release capability is improved, a carbon source and low-temperature protection are provided for microorganisms, and the cell membrane stability is enhanced. The photothermal conversion microspheres efficiently absorb sunlight and convert the sunlight into heat energy, a local and mild heat island effect is formed around the fungicide, the microenvironment temperature is increased, breeding of the fungicide is remarkably accelerated, and therefore organic matter decomposition and nitrogen conversion are accelerated.

This invention proposes a near-earth-colored soil matrix based on coal gangue and its preparation method. The preparation method comprises the following steps: crushing the coal gangue, soil, matrix quality improvement material, red soil, vermiculite, and red clay, sieving them, and uniformly mixing them according to a mass ratio. Biochemical potassium fulvic acid is then added in a proportional amount, mixed evenly, and color confirmed to obtain a near-earth-colored soil matrix. This invention improves the near-earth-colored surface characteristics of the coal gangue-containing soil matrix, making the color of the coal gangue-containing soil matrix more similar to that of local soil. This method effectively supports the market application of coal gangue soil utilization technology and increases market acceptance.

The invention discloses a preparation method of an organic expanded vermiculite / full-biodegradable composite material, and belongs to the field of environment-friendly biodegradable materials. The composite material comprises the following raw materials in parts by weight: 5-30 parts of organic expanded vermiculite, 5-60 parts of polylactic acid, a degradable toughening agent and an auxiliary agent, and the vermiculite raw material in the organic expanded vermiculite is soaked in maleic anhydride or a silane coupling agent and is subjected to microwave expansion treatment. Compared with the prior art, degradation residues of the prepared composite material are mainly expanded vermiculite powder, and the composite material is environmentally friendly and free of pollution, has the effect of improving soil and can be applied to the fields of disposable knives, forks, spoons, straws, film bags and the like through formula adjustment of polylactic acid and the full-biodegradable flexibilizer.

The invention discloses a composite activator based on phosphogypsum as well as a preparation method and application thereof. The composite activator comprises the following raw materials in parts by weight: 50-70 parts of phosphogypsum, 5-15 parts of an alkaline activator, 10-20 parts of fly ash, 5-10 parts of slag powder, 0.5-1 part of a retarder, 0.5-1 part of a water reducer, 0.3-0.7 part of an organic silicon additive and 1-3 parts of expanded vermiculite. The preparation method has the advantage of high efficiency, and solves the problems that the automation degree is low in the preparation process of an existing phosphogypsum composite exciting agent, the steps of raw material weighing, mixing, water adding, filtering, forming and the like need to depend on manual operation, operation delay or unsmooth flow linkage is likely to occur, and the overall production period is prolonged.

The invention discloses an anti-dusting ablation-resistant silicon dioxide aerogel composite material based on multi-phase synergistic reinforcement and a preparation method of the anti-dusting ablation-resistant silicon dioxide aerogel composite material. The inorganic vermiculite powder reinforcement is introduced into the aerogel in situ, the particle size of vermiculite is controlled to realize anchoring-bridging dual effects, a three-dimensional interpenetrating network is formed by co-gelling with the organosilicon precursor solution and the fibrofelt, and the powder falling rate of the finally prepared silicon dioxide aerogel composite material is 1t; mg and Fe elements contained in the vermiculite can promote generation of a glass phase at a high temperature, and cooperate with the fiber felt to resist 1200 DEG C ablation. The density of the product can be controlled to be 200-350kg / m < 3 >, the heat conductivity coefficient is 0.025-0.040 W / (m.K), and the product is suitable for the field of aerospace thermal protection.

The invention discloses an electric hot tray and a cooking utensil, and relates to the field of electric heating. An electric heating disc comprises an electric heating film body, a metal cover plate and a buckle, and filling powder or a thermal expansion plate is arranged between the metal cover plate and the buckle. The filling powder can be placed at any position, and the thermal expansion plate is generally placed between the electrothermal film body and the buckle. The filling powder is graphite, magnesium oxide, aluminum oxide, vermiculite powder, sandy soil and other materials, and the thermal expansion plate is a material with the thermal expansion coefficient larger than that of a connecting material of the metal cover plate and the buckle. By using the filling powder, the powder can be moved through pressure and vibration to fill gaps in the electric heating plate, so that the electrothermal film main body is tightly attached to the metal cover plate, the electrothermal film main body can better dissipate heat, and the thermal power density of the electric heating plate is improved. The thermal expansion plate expands at high temperature, and the similar effect can also be achieved. The cooking utensil comprises any electric hot tray, the product is lower in height and smaller in size, and more cost is saved.

The invention relates to a vermiculite nanosheet film-based three-dimensional moisture generator and a preparation method thereof, the vermiculite nanosheet film-based three-dimensional moisture generator comprises a support, a bottom positive electrode, a functional layer, a bottom negative electrode and a solution pool, the support is successively coated with a positive electrode slurry and a functional mixture, the functional mixture comprises a vermiculite slurry and an adhesive, and a part of the functional layer is wiped to expose the bottom positive electrode. A middle interlayer positive electrode and a middle interlayer negative electrode are embedded into the solution tank, and a moisture absorption mixture is injected into the solution tank and comprises a polymer electrolyte and a fixing agent; the electrode extends out of the solution tank, the bottom positive electrode is close to the middle interlayer positive electrode, the bottom negative electrode is close to the middle interlayer negative electrode, the bottom positive electrode and the bottom negative electrode are oppositely arranged, and the middle interlayer positive electrode and the middle interlayer negative electrode intersect with the bottom positive electrode and the bottom negative electrode. Compared with the prior art, the non-flowing stable moisture absorption layer is formed, and use is more convenient; energy can be fully used, the mutual charging and discharging process is completed, and the recovery speed is increased.

The invention relates to the technical field of preparation of rice seedling raising substrates, in particular to a preparation method and application of a rice seedling raising substrate based on rapid fermentation of reed foam, and the rice seedling raising substrate comprises the following components in parts by weight: 35-50 parts of reed residue, 15-22 parts of cow dung, 8-15 parts of carbonized rice husk, 10-20 parts of turf, 13-22 parts of modified bacterium-loaded vermiculite and 3-8 parts of a nutritional composition, the modified bacterium-loaded vermiculite comprises nitrogen-fixing bacteria and a vermiculite carrier subjected to functional modification. According to the invention, humic acid and other active substances generated in the composting fermentation process of reed residues and cow dung can chelate metal ions in the nutritional composition, the bioavailability of the nutritional composition is improved, and carbonized rice husks, turf and bacterium-loaded vermiculite construct a composite substrate system with excellent physical properties and strong biological functions. Organic unification of nutrition supply, physical support and biological regulation is realized, and an ideal growth medium is provided for cultivating robust rice seedlings suitable for mechanical transplanting.

The utility model relates to the technical field of processing equipment, and provides processing equipment based on vermiculite insulation board production, which comprises a processing table, a protective cover, a cutting knife, a placing frame, a clamping plate, a cleaning plate, a chip discharging screen plate and a collecting cylinder, an inner cavity is arranged in the processing table, the protective cover is fixedly connected to the top end of the processing table, a feeding port is arranged on one side of the protective cover, and a discharging port is arranged on the other side of the protective cover. The cutting knife is lifted through the driving assembly and rotationally installed in the protective cover, the containing frame is slidably arranged on one side of the feeding port through the pushing seat, the two clamping plates are oppositely slidably arranged in the containing frame through the clamping assembly, two limiting openings used for sliding of the clamping plates are formed in the containing frame, and a scrap discharging opening is formed in one side of the machining table. The collecting barrel is located on the lower side of the scrap discharging net plate, and the lower side of the scrap discharging opening is detachably connected with a collecting box. By means of the technical scheme, the problem that in the prior art, chippings generated during machining can hinder the feeding process of the vermiculite insulation board to a certain extent is solved.

The present invention belongs to the fields of catalysts and petrochemicals, and specifically relates to a catalyst, its preparation method, and its application. The catalyst comprises a composite support and an active metal Ni supported on the composite support. The composite support is composed of a modifier and a natural mineral compound, wherein the modifier comprises zirconium and a rare earth metal. The natural mineral is selected from one or more of diatomaceous earth, sepiolite, halloysite, attapulgite, vermiculite, and molybdenite. The rare earth metal is selected from one or more of yttrium, lanthanum, cerium, neodymium, samarium, europium, gadolinium, and ytterbium. The catalyst of the present invention has good structural stability and exhibits high activity and selectivity in the catalytic production of DMS. The catalyst of the present invention exhibits excellent performance in the hydrogenation of DMM to produce DMS, effectively improving DMS selectivity and reducing the production of GBL, BDO, and THF.

The invention discloses a fireproof and antiknock integrated coating for plugging a transformer substation / converter station and a preparation method of the fireproof and antiknock integrated coating, and relates to the field of coatings. The coating paint comprises the following components in parts by weight: 5-8 parts of polyurea resin; 0.5 to 3 parts of a graphene tube; 0.5 to 5 parts of nano tin antimony oxide; 20 to 30 parts of nano silicon dioxide; 30 to 50 parts of vermiculite powder; and 20 to 40 parts of water glass. In order to solve the problems that an organic coating is not fireproof and an inorganic coating is easy to crack and is not explosion-proof at present, an organic-inorganic bi-component curing system is adopted to give consideration to improvement of fireproof and explosion-proof functions, nano-scale particles can reduce heat solid conduction of the material and improve the fireproof grade, vermiculite powder has a cavity structure, solid heat conduction is relatively weak, and the fireproof performance of the material is improved. And the coating is used for a plugging system of a converter station, and can effectively solve the problems of high construction and maintenance difficulty and long period of the plugging system.

[Problem] The present invention provides a friction pair having excellent low-speed performance stability, comprising a disc brake pad having a friction material composed of a friction material composition and a stainless steel disc rotor. The friction material composition comprises a binder, a fiber base material, and a friction modifier, and is free of copper and iron-based metal fibers. [Solution] The present invention utilizes a friction material composition containing 20-30% by weight of a titanate as an inorganic friction modifier relative to the total weight of the friction material composition, and is free of mica and vermiculite. The titanate is preferably lithium potassium titanate having a layered crystal structure.

The present invention provides a high-temperature resistant thermal insulation coating for a kiln, and its preparation method and application. The thermal insulation coating includes a primer and a topcoat. By mass, the A component of the primer mainly consists of sodium silicate with a modulus of 2.0, and the B component mainly consists of metakaolin, mineral powder, 200-mesh quartz sand, 80-120-mesh quartz sand, and 40-80-mesh quartz sand; the A component of the topcoat mainly consists of sodium silicate with a modulus of 2.0, and the B component mainly consists of metakaolin, mineral powder, expanded vermiculite, expanded perlite, diatomite zeolite mixed modifier, air-entraining agent, and basalt fiber. Among them, sodium silicate, metakaolin, and mineral powder are used as film-forming substances, which have a strong binding force with metals. At the same time, the raw materials in each formula of the primer and the topcoat cooperate with each other, and the primer and the topcoat cooperate with each other and act synergistically, so that when the above thermal insulation coating is applied to the metal shell of a kiln, etc., it has the characteristics of high bonding strength, good thermal insulation performance, and good freeze-thaw resistance.

This invention discloses a composite transparent film and its preparation method, relating to the technical field of polymer materials. The preparation method of the composite transparent film includes the following steps: (1) melting and blending vermiculite and fluororubber to obtain fluorinated vermiculite; then mixing the fluorinated vermiculite and mica evenly to obtain composite clay; (2) mixing polyvinyl alcohol solution, composite clay, and SESC lignin evenly to obtain a precursor solution, wherein the mass ratio of polyvinyl alcohol, composite clay, and SESC lignin is 45:45:(8-12); then spreading and drying the precursor solution on a substrate by casting, followed by heat treatment to obtain the composite transparent film. The composite transparent film of this invention possesses excellent water vapor barrier properties, ultraviolet absorption capacity, good transparency, high mechanical strength, and weather resistance.

The invention relates to the technical field of solid waste treatment, in particular to a method and a device for converting oily sludge pyrolysis residues into soil. Comprising the following steps: raw material preparation: mixing 40-50 parts by weight of oily sludge pyrolysis residues, 35-40 parts by weight of mushroom dregs, 4-10 parts by weight of vermiculite, 9-15 parts by weight of straws and 1-3 parts by weight of humic acid; performing fermentation treatment: performing composting fermentation on the prepared raw materials, controlling the fermentation temperature to be 30-60 DEG C, the water content of the materials to be 55-65% and the fermentation time to be 20-90 days, and performing intermittent stirring and ventilation in the fermentation process; according to the method for converting the oily sludge pyrolysis residues into the soil, the oily sludge pyrolysis residues can be converted into the soil improvement product with a good physical structure, rich nutritional ingredients and active microbial communities, and resource utilization of waste is achieved.

The invention belongs to the field of refractory materials, and provides a light heat-insulating refractory brick and a preparation method thereof. The light heat-insulating refractory brick comprises particles, mixed powder and an additional binding agent, the particles comprise, by weight, 10-15 parts of expanded vermiculite and 30-45 parts of closed cell perlite, and the mixed powder comprises, by weight, 15-25 parts of spherical quartz powder and 5-15 parts of perlite dust collecting powder. The raw materials comprise, by weight, 5-10 parts of waste silica brick powder, 5-10 parts of siliceous pyrophyllite powder, 10-15 parts of Jiaozhou white clay, 5-15 parts of sodium montmorillonite powder and 5-15 parts of limonite powder; the additional binding agent comprises the following raw materials in parts by weight: 3-5 parts of binding slurry and 3-5 parts of pre-gelatinized starch. The refractory brick disclosed by the invention is a light heat-insulating refractory brick which is small in volume density, small in heat conductivity coefficient and capable of meeting the requirement of heat insulation in a high-temperature kiln at 900-1000 DEG C in normal-temperature compressive strength.

The invention relates to the technical field of dispersion liquid preparation, and discloses a vermiculite aqueous dispersion liquid, a preparation method and application, the preparation method comprises the following steps: preparing raw materials, mixing vermiculite and a pretreatment agent, adding a hydrogen peroxide aqueous solution, stirring, controlling the temperature, adding a pH regulator and a functional auxiliary agent, and stirring, the raw materials comprise vermiculite, a pretreating agent, a hydrogen peroxide aqueous solution, a pH regulator and a functional additive; the mass content of hydrogen peroxide in the hydrogen peroxide aqueous solution is not less than 20% High-concentration hydrogen peroxide is matched with a pretreatment agent, the reaction is rapid and complete, additional heating is not needed, the product dispersion stability is good, the storage life is long, the product is environmentally friendly, the formula can be flexibly adjusted to adapt to different scenes, and the product is suitable for high-temperature environment surface treatment, fire resistance and fire prevention / fire extinguishment (such as lithium batteries and steel structures), electricity / catalysis industry functional carriers and the like.

The utility model belongs to the technical field of ecological breeding equipment, and particularly relates to an in-water circulation ecological breeding barrel which is detachably arranged in a breeding pond, a plurality of breeding holes are circumferentially formed in the bottom of the breeding barrel, water permeable holes are circumferentially formed in the top of the breeding barrel, and a multi-layer composite substrate layer sequentially comprises a first soil layer, a second soil layer and a third soil layer from bottom to top, the first soil layer comprises soil and earthworm soil, and the earthworm soil contains active earthworm groups; the second soil layer comprises coco coir, perlite and vermiculite; the third soil layer comprises peat, perlite and vermiculite; the fourth soil layer comprises peat and vermiculite, and the biological-physical synergistic purification system has the beneficial effects that biological-physical synergistic purification is achieved, and the self-purification capacity of the system is improved.

The invention discloses a preparation method of an ultra-light ablation-resistant composite material with a gradient structure, and belongs to the technical field of composite material preparation. In order to solve the technical problem that a traditional material is difficult to consider low density, heat insulation property and ablation resistance at the same time, vermiculite nanosheets and water-soluble phenolic resin are compounded in a solution state, a three-dimensional porous matrix is constructed by adopting directional freeze drying, the surface of the matrix is coated with a ceramic precursor, and then high-temperature cracking is performed to form a compact ceramic layer; and gradient transition from the internal porous structure to the outer ceramic layer is realized. The ablation-resistant composite material with the gradient structure, which is low in density, excellent in heat insulation performance, enhanced in ablation resistance and high in interface bonding strength, can be obtained.

The invention relates to the technical field of engineering simulation experiments, in particular to a surrounding rock similar material for simulating an active fault crossing tunnel experiment and a preparation method, and the surrounding rock similar material is prepared from the following raw materials in parts by weight: 50-90 parts of cement, 130-1400 parts of yellow sand, 75-85 parts of bryozoatum, 75-85 parts of vermiculite, 50-90 parts of gypsum and 130-150 parts of water. Glass fibers accounting for 0.3% of the total volume of the raw materials and a water reducing agent accounting for 0.5% of the total mass of the raw materials are further doped into the raw materials of the similar material, cement, gypsum, yellow sand, bryozoatum, vermiculite, the glass fibers and water are adopted as the raw materials for preparing the rock surrounding rock material for simulating the active fault crossing tunnel, the raw materials are easy to obtain, cost is low, and the similar material is suitable for large-scale production. Meanwhile, compared with other existing similar surrounding rock materials, the rock surrounding rock material prepared by the preparation method disclosed by the invention can better simulate the damage and cracking effects of the rock surrounding rock.