782 results about "Rice hulls" patented technology

The invention discloses high-toughness ultra-high performance concrete and a preparation method thereof, and relates to the technical field of polymer modified materials thereof. The concrete is composed of a cementitious material composite system, a fiber-reinforced system and a polymer modifier, the cementitious material comprises Portland cement, nano-silica, a rice hull ash-based auxiliary cementitious material and gradient grading quartz powder, and the fiber system adopts steel fiber / basalt fiber / polypropylene fiber multi-scale composite reinforcement. And a polyurethane emulsion interface modifier is matched. During preparation, a dry mixing-fiber dispersion-wet mixing three-stage process is combined with a microfluidization emulsification and segmented polymerization technology, so that uniform dispersion of fibers and matrix-fiber interface reinforcement are realized. The scheme has high strength, high toughness and industrial feasibility, and is suitable for harsh engineering scenes such as bridge joints and explosion-proof structures.

According to the mullite castable preparation method based on comprehensive utilization of the secondary aluminum ash nonferrous smelting slag, components are regulated and controlled by controlling the molar ratio of Al2O3 to SiO2, so that porous light mullite stably falls into a mullite phase region, and generation of excessive corundum phases is avoided. PMMA microspheres, corn flour, carbonized rice husks and SiO2 coated calcium carbonate composite pore-forming agent systems are adopted, and a layered slurry formula, gradient slip casting and segmented sintering processes are combined, so that the porosity and strength distribution are accurately regulated and controlled, and low-temperature sintering and amorphous phase change control are realized. By optimizing the grading of the porous light mullite aggregate and adding the homologous fine powder, the bonding strength and compressive strength of the castable are improved. And finally, the surface of the castable is coated with a compact mullite coating, so that the porosity is reduced, and the erosion resistance, corrosion resistance and stripping resistance are remarkably improved. The obtained castable has the advantages of light weight, high temperature resistance, high strength, low cost and excellent thermal stability and erosion resistance.

The invention belongs to the technical field of fuel cell electrode material preparation, and particularly relates to a carbon electrode material for a polypyrrole modified bio-based fuel cell and a preparation method of the carbon electrode material. Comprising the following steps: modifying rice hull low-temperature carbonized powder by sequentially adopting POSS (Polyhedral Oligomeric Silsesquioxane) containing unipolar functional groups and POSS containing polypolar functional groups to obtain modified low-temperature carbonized powder; and carrying out in-situ polymerization on a pyrrole monomer on the surface of the modified low-temperature carbonized powder, and carrying out high-temperature carbonization and hydrofluoric acid corrosion to obtain the polypyrrole modified bio-based fuel cell carbon electrode material. The polypolar functional group POSS not only is beneficial to the in-situ polymerization reaction of pyrrole, but also can form a continuous macromolecular chain, and a net structure is formed on the surface of the whole material. The effect of the unipolar functional group POSS is to improve the stability of the low-temperature carbonized powder in the high-temperature carbonization process, and more importantly, the unipolar functional group POSS is to provide a channel for subsequent hydrofluoric acid corrosion, etch away non-conductive substances and improve the conductivity and specific surface area of the carbon electrode material.

The invention discloses a road cementing material based on bulk solid wastes and a preparation method thereof, and belongs to the field of geopolymer cementing materials. The material is prepared from 35-38 parts of fly ash, 15-18 parts of acid-washed red mud, 22-25 parts of carbide slag, 20-23 parts of phosphogypsum, 5-8 parts of rice hull ash, 6-9 parts of a water reducing agent and water, and the water-binder ratio is (0.4-0.5): 1. Wherein the pickling red mud is treated by 5-6% dilute sulphuric acid (pH is 8-9, and heavy metal is reduced by 30%), and the rice hull ash (SiO2 is greater than or equal to 85%) and the nano silicon dioxide (10-30nm) synergistically optimize the microstructure. The 28-day compressive strength of the material is larger than or equal to 35 MPa, the load cycle strength loss rate is smaller than or equal to 5%, the CO2 emission amount is 62 kg / t, the heavy metal leaching concentration is lower than the national standard by 50%, and the cost is only 31.6% of that of traditional cement. According to the invention, efficient synergistic utilization of four solid wastes of fly ash, red mud, carbide slag and ardealite is realized, and the concrete has the characteristics of high strength, low pollution, salt corrosion resistance and the like, is suitable for heavy-duty road base and severe cold area engineering, and has remarkable environmental protection and economic values.

The invention relates to a mine solid waste-based composite saline-alkali soil modifier as well as a preparation method and application thereof, and belongs to the technical field of soil remediation and solid waste recycling. The modifier is prepared from volcanic rock solid waste, rice husk and mussel shell as raw materials through oxalic acid activation, microbial fermentation carbonization and humic acid chelation, and comprises 50-70 parts of activated stone powder-containing porous particles, 20-30 parts of rice husk-based charcoal, 10-20 parts of humic acid chelated magnesium-calcium powder and 3-5 parts of a composite binder. The preparation method comprises the following steps: ultrasonically activating the stone powder oxalic acid, and puffing and granulating with the binder; inoculating the rice hulls with salt-tolerant bacillus and actinomycetes for aerobic fermentation and carbonization; and the shell is activated by oxalic acid and then is loaded with a humic acid calcium magnesium compound. The modifier is applied according to 50-200kg / mu, so that the nutritional ingredients and the air permeability can be improved. According to the method, solid waste recycling, solid waste consumption and landfill cost and CO2 emission reduction are achieved, and the method is suitable for ecological restoration of the coastal saline-alkali soil and has both environmental protection and economic benefits.

The invention discloses a geopolymer loess curing agent formula based on multi-element bulk solid waste and a preparation method thereof, and relates to the technical field of bulk solid waste geopolymer loess curing agents, the geopolymer loess curing agent formula comprises the following components: 50-70 parts of a curing material component, 10-30 parts of a reinforcing component, and 5-25 parts of an excitation component; the curing material component is fly ash, and the particle size of the curing material component is smaller than 300 microns; the reinforcing component is rice hull ash (the main component is SiO2); the single-component geopolymer curing agent is prepared by taking the rice hull ash and bulk solid waste as main raw materials, the use amount of solid waste exceeds 80%, on one hand, various solid waste can be effectively treated through the method, and on the other hand, the use amount of the solid waste is reduced; on the one hand, the solid waste can be converted into a product with a high additional value, full utilization of resources is achieved, on the other hand, the stacking cost of the solid waste can be reduced, the negative influence of the solid waste on the environment is reduced, and meanwhile a large number of resources are saved.

The invention discloses a tricholoma matsutake culture medium using litchi branches as a matrix and a cultivation method thereof. The tricholoma matsutake culture medium is prepared from the following components in percentage by weight: 30-50% of litchi sawdust, 30-50% of cottonseed hulls, 3-8% of bran, 3-8% of corncobs, 3-8% of rice husks, 1-5% of corn flour and 1-5% of lime. The method is characterized in that the litchi branches are added into the stock liquid culture medium for making the branch seeds for the first time, on one hand, the tricholoma matsutake strains can be trained to generate extracellular enzymes capable of utilizing litchi wood chips, macromolecules of the litchi branches can be rapidly decomposed, and on the other hand, nutrient elements contained in the litchi branches can promote growth of tricholoma matsutake hyphae more rapidly, and the growth rate of the tricholoma matsutake hyphae is increased. The branch seeds are large in inoculation area and high in hybrid resistance, the growth time of mycelium of the cultivation material can be shortened, and the fruiting rate is increased. The invention not only provides a solution for innocent treatment of the litchi branches, but also finds a new culture medium for red tricholoma matsutake culture.

The invention relates to the technical field of grease processing, in particular to a preparation method for extracting refined vegetable oil fatty acid. A preparation method for refined vegetable oil fatty acid extraction comprises the following steps: vegetable oil refining treatment and refined vegetable oil fatty acid separation and extraction. In the vegetable oil refining treatment process, the degummed vegetable oil is subjected to deacidification and decolorization treatment by using the modified rice hull-based porous carbon, so that pigments, free fatty acids and heavy metal components in the vegetable oil can be efficiently adsorbed, the effects of adsorption, deacidification and decolorization are achieved at the same time, and the vegetable oil refining efficiency is effectively improved; vegetable oil refining quality is improved, so that the extraction effect of refined vegetable oil fatty acid is improved; in the separation and extraction process of fatty acid in the refined vegetable oil, the contact between urea and saturated fatty acid in the refined vegetable oil can be promoted by adding the crystallization inclusion additive, and a stably-clathrated composite crystal is quickly formed, so that the extraction purity of unsaturated fatty acid is improved.

The invention relates to the technical field of preparation of phase-change materials, in particular to a steel slag-based porous ceramic composite phase-change material and a preparation method thereof.According to the preparation process, a sacrificial template method and a foaming agent pore-forming method are combined, waste polyurethane foam and waste wood pulp sponge are used as templates, industrial solid wastes (steel slag, fly ash and rice hull ash) are used as raw materials, and the steel slag-based porous ceramic composite phase-change material is prepared. The steel slag-based porous ceramic is prepared. The steel slag-based porous ceramic composite phase change material is prepared by using the prepared steel slag-based porous ceramic as a carrier vacuum adsorption phase change material. According to the invention, resource utilization of wastes is promoted, and environmental pollution caused by industrial solid wastes, biomass wastes and plastic wastes is reduced. The steel slag-based porous ceramic with abundant pore structures and the steel slag-based porous ceramic composite phase change material with good thermal performance and thermal cycle performance are prepared by adjusting the proportion of the raw materials, the porosity of the porous template and the impregnation vacuum degree. The preparation method is simple and suitable for large-scale production.

The invention belongs to the technical field of concrete, and particularly relates to high-water-permeability recycled concrete. The concrete is prepared from 170 to 190 parts of water, 300 to 320 parts of cement, 90 to 120 parts of fly ash, 80 to 120 parts of silica fume, 90 to 110 parts of rice hull ash, 580 to 620 parts of medium sand, 430 to 470 parts of recycled fine aggregate, 1000 to 1100 parts of recycled coarse aggregate, 70 to 100 parts of ceramsite, 6 to 8 parts of a water reducing agent, 2 to 4 parts of an air entraining agent, 1 to 3 parts of a retarder, 110 to 130 parts of fly ash hollow microspheres, 70 to 90 parts of steel slag powder, 30 to 40 parts of silica sol, 20 to 30 parts of cellulosic fibers and 40 to 50 parts of an alkaline activator. 50-60 parts of an organic porous waste material; the composite material has abundant pore structures, strong water permeability, moderate strength, high resource utilization rate, outstanding environmental protection property and the like, improves the utilization rate of rainwater resources, and promotes continuous improvement of ecological environment.

The invention discloses a gradient pore structure geopolymer asphalt mixture warm mixing agent which is composed of the following components in parts by weight: 65-85 parts of regenerated micro powder, 15-35 parts of rice hull ash, 15-20 parts of a sodium silicate solution, 5-10 parts of sodium hydroxide and 10-20 parts of deionized water. The invention also discloses a preparation method of the geopolymer asphalt mixture warm mixing agent. The geopolymer asphalt mixture warm-mixing agent has a gradient pore structure and has no closed pores or semi-closed pores, so that the water carrying capacity in the geopolymer asphalt mixture warm-mixing agent can be greatly improved, and the pore structure is arranged in a gradient manner (gradually released from large pores to small pores), so that the water release period of the warm-mixing agent can be effectively prolonged, and meanwhile, the water release rate can be uniform; compared with a hot-mixed asphalt mixture, the geopolymer asphalt warm-mixing agent with the gradient pore structure has the advantages that the mixing temperature of the asphalt mixture can be remarkably reduced, and meanwhile, the high and low temperature performance, the water damage resistance and the fatigue resistance of the asphalt mixture can be improved.

The invention discloses lightweight low-carbon thermal insulation mortar, which is characterized by being prepared from the following ingredients in parts by weight: 100 to 160 parts of quick lime, 250 to 350 parts of phosphogypsum, 300 to 450 parts of mineral powder, 350 to 550 parts of coal gangue pottery sand, 60 to 100 parts of polystyrene foam particles, 70 to 110 parts of rice hulls, 180 to 260 parts of coffee grounds, 10 to 20 parts of polypropylene fibers, 2 to 4 parts of dispersing agents, 1 to 2 parts of air entraining agents and 600 to 700 parts of water. An alkali-activated cementing material composed of quicklime, ardealite and slag powder is adopted to replace a traditional cement-based cementing material, coal gangue pottery sand is adopted to replace common sand, and rice husks and coffee grounds are introduced as light filling materials, so that the light low-carbon thermal insulation mortar is successfully prepared and has good thermal insulation performance and mechanical performance, and the thermal insulation performance of the light low-carbon thermal insulation mortar is greatly improved. The carbon emission of buildings can be effectively reduced, and the strategic requirements of green buildings and sustainable development are met.

The invention discloses a method for preparing high-modulus sodium silicate and co-producing white carbon black from rice hull ash. The method comprises the following steps: crushing the rice hull ash, and acidizing to obtain purified rice hull ash powder; reacting the purified rice hull ash powder with 5wt%-15wt% of caustic soda generated by bipolar membrane electrolysis to prepare a sodium silicate solution; carrying out neutralization reaction on the sodium silicate solution and 1-15 wt% of sulfuric acid solution under the assistance of ultrasonic waves, and filtering to obtain silicon dioxide silica gel and filtrate; washing and drying the silicon dioxide silica gel to obtain a white carbon black product; and carrying out electrolytic treatment on the filtrate through a bipolar membrane electrodialysis system, and respectively recycling the recovered alkali liquor and acid liquor. According to the method, resource utilization of the rice hull ash and cyclic regeneration of the reaction medium are realized, and a green production process is formed.

The invention belongs to the field of soil solidification, and particularly relates to a method for reinforcing a loess foundation through cooperation of EICP and rice husks. Comprising the following steps: 1, compounding long and short rice hull fibers, and sequentially carrying out alkali treatment activation, coupling agent modification and hydroxypropyl methyl cellulose reinforcement treatment; 2, calcining rice hulls, and grinding to obtain rice hull ash; 3, mixing a composite reinforcing agent obtained by compounding the modified and reinforced rice hull fibers and rice hull ash with loess to be reinforced; 4, mixing the urease extracting solution with a reinforcing solution containing urea and calcium ions, and adjusting the pH value to weak acidity to obtain mixed slurry; and 5, the mixed slurry is sprayed into the to-be-reinforced loess mixed with the composite reinforcing agent, and after grouting is finished, the surface of the soil body is covered with a film and subjected to water spraying maintenance. Through synergistic cooperation of the rice hull fibers and the rice hull ash, the common problems of non-uniform cementation and poor deep reinforcement effect during loess reinforcement by an EICP technology are effectively solved.

The invention discloses a biological soil conditioner containing mineral powder and a preparation method thereof, and belongs to the technical field of microbial soil conditioners. The conditioner is prepared from the following raw materials in parts by weight: 20 to 40 parts of compound microorganism bacterium liquid, 10 to 20 parts of mineral powder and 15 to 20 parts of auxiliary material carrier. According to the invention, two high-acid-resistance growth-promoting bacterial fungal microorganisms are screened, compounded and loaded into the high-activity rice hull biochar, and all the raw materials are matched with one another, so that the aluminum pollution of the acid-aluminum soil can be improved, the soil fertility can be improved, the growth of plants can be promoted, the microbial community structure of the soil can be enriched, and the application prospect is great.

The invention discloses a porous carbon preparation method and a continuous fluidized bed system.The porous carbon preparation method comprises the steps that rice husks and bamboo fibers are mixed and smashed, the smashed rice husks and bamboo fibers are dried and then mixed with a composite activating agent solution to be steeped, and a pretreated material is formed; feeding the pretreated material into a first-stage fluidized bed, and carbonizing the pretreated product in a nitrogen atmosphere to obtain a carbonized product; feeding the carbonized product into a second-stage fluidized bed, introducing saturated steam and CO2 gas into the second-stage fluidized bed in stages, and activating the carbonized product to obtain an activated product; feeding the activated product into a third-stage fluidized bed, introducing methane gas into the third-stage fluidized bed in an inert gas atmosphere, and performing micropore surface modification on the activated product to obtain a modified product; and washing the modified product with a hydrochloric acid solution and deionized water in sequence, and carrying out vacuum drying to obtain a porous carbon product. According to the preparation method of the porous carbon, the micropore development efficiency is improved, and continuous production of the porous carbon with high specific surface area and high micropore proportion is realized.

The utility model discloses a rice hull crushing and processing device. A crushing tank; one end of the rotating shaft is rotationally connected with the lower end face in the crushing tank, and the other end of the rotating shaft penetrates through the upper wall of the crushing tank; the outer surface of the rotating shaft is sleeved with the rotating pipe, and the upper end of the rotating pipe rotationally penetrates through the upper wall of the crushing tank; the first crushing cutter is fixedly mounted on the outer surface, located in the crushing tank, of the rotating shaft; the second crushing cutter is fixedly mounted on the outer surface, located in the crushing tank, of the rotating pipe; and the conveying mechanism is arranged on one side of the crushing tank and communicates with the crushing tank, and under the action of a rotating shaft and a rotating pipe, the rotating directions of a first crushing cutter and a second crushing cutter can be opposite, so that the rice husks can be crushed more thoroughly, the crushing quality is improved, and convenience is brought to people.

The invention discloses core-shell type solid waste-based functional granules as well as a preparation method and application thereof. The core-shell type solid waste-based functional granules comprise a core material and a shell material coating the surface of the core material, wherein the core material comprises 20-90 parts of river sludge, 1-15 parts of hydrogen peroxide, 10-50 parts of rice hull ash, 1-12 parts of sodium hydroxide and 5-40 parts of desulfurized gypsum; the shell material comprises 10-100 parts of steel slag, 5-40 parts of mineral slag, 5-30 parts of desulfurized gypsum and 2-13 parts of polyvinyl alcohol. According to the invention, comprehensive treatment and application of the river sludge and the steel slag are realized.

The invention discloses a method for preparing a catalyst from a lithium iron phosphate battery positive electrode. An iron solution is recovered from a lithium iron phosphate battery positive electrode material; adding the obtained iron solution into a gelatin solution to obtain a catalyst precursor; absorbing the precursor by using rice hull-based white carbon black; and drying, heating and carbonizing to obtain the granular catalyst. The Fe-coated NC catalyst is prepared in situ, and solid waste of a lithium iron phosphate type lithium ion battery positive electrode material is recycled. And through secondary loading, the recoverability of the catalyst is improved.

The invention discloses a white carbon black preparation method based on rice husk resource utilization, which comprises the following steps: carbonization: drying rice husks, carrying out anoxic carbonization at 550-600 DEG C for 3-4 hours, crushing and sieving; alkali dissolution: mixing the carbonized rice husks with a 2mol / L NaOH solution according to a mass ratio of 1: (5-7), reacting in a water bath at 95 DEG C for 3-4 hours, and filtering to obtain a sodium silicate solution; acid leaching: slowly adding a 9-10% H2SO4 solution into the filtrate, firstly adjusting the pH value to 11-12, aging for 1 hour, then adjusting the pH value to 9-10, and aging for 2-3 hours at 80 DEG C; post-treatment: washing to be neutral, and drying to obtain a white carbon black product. The specific surface area of the product is larger than or equal to 200 m < 2 > / g, the SiO2 purity is larger than or equal to 95%, efficient comprehensive utilization of rice hull resources is achieved, and the white carbon black production cost is reduced; a staged pH regulation and control process is developed, and the amorphous state purity of the white carbon black is improved; and a carbonization-alkali dissolution-acid leaching whole-flow process system is constructed, so that the environmental pollution is reduced.

The invention discloses medium and low temperature porous wave-absorbing iron-based composite ceramic and a preparation method thereof. The medium and low temperature porous wave-absorbing iron-based composite ceramic is prepared from the following raw materials in percentage by weight: 10 to 50 weight percent of wave-absorbing functional phase, 20 to 40 weight percent of ceramic matrix, 5 to 15 weight percent of pore forming agent, 5 to 10 weight percent of dielectric loss phase, 0.5 to 1 weight percent of stearic acid, 0.2 to 0.5 weight percent of silane coupling agent and 30 to 34.5 weight percent of binding phase. According to the preparation method, a low-temperature sintering process is adopted for optimization, and the activity of the magnetic loss phase is protected. The iron-based composite ceramic with a gradient porous structure is obtained by adopting a freezing injection molding method, and broadband efficient wave absorption can be realized. The magnetic-dielectric cooperative loss is enhanced, and the limitation of a single mechanism is broken through. Starch or rice hull ash microspheres are used as a degradable pore-forming agent, so that green process and short-process design are realized. The mechanical property and the stability of the iron-based composite ceramic structure are improved, the application scene is expanded, and the cost advantage is achieved.

The invention belongs to the technical field of building materials, and particularly discloses UHPC (Ultra High Performance Concrete) without shrinkage to micro-expansion deformation. The UHPC belongs to a scheme of reducing from a cement-active admixture-inert admixture-aggregate-fiber full scale, the problem of large self-constriction of traditional UHPC is solved, and non-constriction and even micro-expansion of the UHPC can be realized. The 28d compressive strength of the UHPC standard curing is greater than 130MPa, the 28d ultimate flexural tensile strength is greater than 20MPa, the 28d ultimate tensile strength is greater than 8MPa, and both high mechanical property and high volume stability are realized. The use amount of the cement is low, and a large amount of industrial waste residues and regenerated construction waste products are used, so that the brick is more environment-friendly; the method has the advantages of simple process, low cost, no use of silica fume, superfine mineral powder, rice hull ash and other superfine powder in conventional UHPC, reduction of energy consumption and cost, convenience in production and use, great improvement of the construction efficiency, and extremely high large-scale application value.

The invention discloses a preparation method and application of an iron-manganese modified biochar material for remediation of cadmium and arsenic contaminated soil, and relates to the field of new materials.According to the material, rice hull biochar serves as a carrier, and the specific surface area and surface active sites are increased through programmed intermittent ball milling; and the Fe-O / Mn-O bonding modification complex is formed through gradient loading of iron and manganese oxides. The maximum adsorption capacity of the material to Cd < 2 + > and As (V) reaches 71.54 mg.g <-1 > and 49.30 mg.g <-1 > and is 1.65 / 2.53 times that of original biochar, the content of available Cd and As in soil is reduced by 8.98% and 25.2% under the condition that the addition amount is 0.4%, and the passivation efficiency is improved by 1.05 times (Cd) and 9.08 times (As) compared with that of non-ball-milled iron-manganese modified biochar; the material prepared by the method is applied to cadmium and arsenic polluted soil, pollution can be controlled by waste, and the soil can be effectively repaired.

The invention discloses a rice hull fiber environment-friendly material and a preparation method thereof, and belongs to the technical field of polypropylene plastics. The preparation method is used for solving the technical problems that a plastic product prepared from polypropylene plastic in the prior art is difficult to degrade, and the mechanical property of the polypropylene plastic can be damaged by doping degradable organic components. The rice hull fiber environment-friendly material comprises rice hull fiber composite microspheres, a chlorinated polypropylene graft copolymer and related auxiliaries. The rice hull fiber composite microspheres are prepared by blending acylated rice hull fiber powder and a melt as a core material, wherein the melt is obtained by mixing rosin, silver nitrate and polylactic acid and heating; the chlorinated polypropylene grafted copolymer is obtained by taking chlorinated polypropylene as a main body and initiating grafting of methyl methacrylate and triallyl cyanurate. The rice hull fiber environment-friendly material prepared by the invention has the advantages of good mechanical property, bacteriostasis, flame retardance and degradability.

The invention discloses a high organic matter sludge-based ecological restoration spray-seeding base material preparation and vegetation method, the spray-seeding base material is prepared by mixing 60%-75% of dehydrated sludge, 5%-10% of an ecological curing agent, 3%-5% of pretreated straw fiber, 3%-8% of broken rice husk and 10%-15% of a solid waste conditioner by dry mass, a certain amount of water is added to adjust the slump of the base material to 170-180mm, and the spray-seeding base material has the characteristic of early strength. The planting construction is performed by three times of spray-seeding, the spray-seeding thickness of each time is 5-7cm, the interval time is not less than 3h, grass seeds are mixed during spray-seeding of the last layer, and the surface is covered with a degradable fiber net. The prepared base material has good fluidity, mechanical strength and vegetation performance and can be applied to various slope ecological restoration and greening planting projects, and large-scale collaborative ecological utilization of river and lake bottom mud and other industrial solid waste materials is achieved.

The utility model provides a rice husk-based silicon dioxide aerogel normal pressure drying device, which belongs to the technical field of aerogel drying and comprises a containing table, a water containing tank is fixedly connected onto the containing table, a drying box is arranged at the upper end of the containing table, a rotating component is arranged on the drying box, stirring blades are fixedly connected onto the rotating component, and the stirring blades are fixedly connected onto the water containing tank. And the stirring blades are positioned in the drying box. The rice hull-based silicon dioxide aerogel normal-pressure drying device solves the problems that an existing rice hull-based silicon dioxide aerogel normal-pressure drying device cannot conveniently dry silicon dioxide aerogel raw materials of different specifications at the same time, the drying efficiency of the silicon dioxide aerogel raw materials is reduced, and practicability is greatly reduced.

The utility model relates to a bag-breaking-free rice hull bale breaker which comprises a mechanical arm, a mechanical arm grabbing mechanism, a rice hull suction stripping device and a collecting hopper, the mechanical arm is connected with the mechanical arm grabbing mechanism, and the mechanical arm grabbing mechanism is provided with spike teeth and a negative pressure suction cup. The spike teeth can be inserted into the bottom of a rice hull bag, the rice hull bag is grabbed upwards through extrusion friction force between rice hulls and transferred to the position above the rice hull suction and stripping device, and the collecting hopper is arranged below the rice hull suction and stripping device. When the rice husks are taken out from the rice husk bag, the original package is not damaged, the operation cost is reduced, and the subsequent deep processing of the rice husks is not influenced.

The invention provides a cattle fermentation bed composite padding based on bacterium-enzyme synergistic effect and a preparation method thereof, and relates to the technical field of livestock and poultry breeding, the cattle fermentation bed composite padding comprises a rice hull layer located at the top, a slow release layer located in the middle and a fermentation layer located at the bottom, the rice hull layer comprises hydrophobic modified rice hulls, the slow release layer comprises PLA melt-blown cloth, and the fermentation layer comprises PLA melt-blown cloth. The PLA melt-blown cloth is compounded with microspheres through hot pressing, and the fermentation layer comprises the following components in parts by mass: 0.5-2 parts of aspergillus niger spores, 8-15 parts of bran and 90-110 parts of bagasse. The method has the beneficial effects that turning-free, self-oxygen-adjusting and long-acting fermentation can be realized, and efficient fermentation and long-term stable operation are realized by adopting a three-layer sandwich structure and combining hydrophobic modification, gas slow release and bacterium-enzyme synergistic degradation technologies.

The invention belongs to the technical field of nutritional aggregates, and particularly relates to a core-shell type slow-release water-retention nutritional aggregate as well as a preparation method and application thereof. The method comprises the following steps: 1) mixing a nutrition base material and rice hull powder to obtain first coating layer powder; 2) adding ceramsite and a cementing material into a ball forming mill, and premixing to obtain ceramsite coated with the cementing material; (3) adding a binder and the first coating layer powder obtained in the step (1) into the ball forming mill, continuously premixing, and forming a second coating layer on the surface of the ceramsite coated with the cementing material to obtain a core-shell material; (4) curing the core-shell material; and 5) drying and screening the core-shell material to obtain the core-shell type slow-release water-retention nutritional aggregate. The comprehensive improvement of mechanical properties, water retention, slow release and environmental adaptability is realized.

The invention relates to the technical field of foamed ceramics, in particular to a foamed ceramic and a preparation method thereof. The foamed ceramic comprises the following raw materials in parts by weight: 30-50 parts of waste cathode carbon blocks, 15-30 parts of rice hull ash, 15-30 parts of fly ash, 3-10 parts of calcium carbonate, 3-10 parts of expanded perlite and 2-5 parts of basalt fibers. According to the invention, the waste cathode carbon block is pretreated to form a porous structure, the porous structure and gas decomposed by calcium carbonate are jointly used as a gas source at a high temperature to generate initial pores, and a glass phase formed after rice hull ash activation has certain fluidity during sintering, and can fill pores, adjust pore surface tension and promote uniform expansion of the pores; the basalt fibers are inserted into the matrix in a three-dimensional bracket form, and collapse of pores due to high-temperature shrinkage or gas escape is prevented through physical support, so that the stability and uniformity of the pore structure are ensured, and the heat insulation performance of the foamed ceramic is improved.