556results about How to "Extensive sources of raw materials" patented technology

The invention relates to high-strength ultra-high-toughness concrete and a preparation method thereof. The concrete is prepared from, by weight, 400-800 parts of cement, 100-250 parts of silica fume, 200-500 parts of slag powder, 200-500 parts of fly ash, 200-500 parts of quartz powder, 800-1,000 parts of quartz sand, 20-40 parts of a water reducing agent, 180-250 parts of water and 15-25 parts of polyethylene fibers. When the concrete is prepared, the cement, the silica fume, the slag powder, the fly ash, the quartz powder and the quartz sand are added into a stirrer by weight, and the dry powder is stirred for 2-3 min and fully mixed to be uniform; after stirring is finished, the mixed dry powder is transferred into a mold, vibrating is conducted for 1-2 min for molding, curing and demolding are conducted, and then the high-strength ultra-high-toughness concrete is prepared. Compared with the prior art, the concrete has the advantages that the compressive strength reaches 120-150 MPa, the breaking strength reaches 30-50 MPa, the tensile strength reaches 15-22 MPa, and the tensile elongation reaches 4%-8% and has the very good application prospect.

The invention relates to a preparation method for carbon microspheres with high specific surface area. The preparation method includes the following steps: a carbon material, an alkaline activator, a binder and a solvent are mixed and stirred to obtain slurry, or the alkaline activator, the binder and the solvent are mixed and stirred to obtain slurry; all the materials are granulated to obtain primary carbon microspheres; the primary carbon microspheres go through activation, pickling, washing and drying to obtain the carbon microspheres with the high specific surface area. The preparation method provided by the invention adopts low-value carbonaceous waste materials or amorphous carbonaceous raw powders to prepare the microsphere carbon material with the high specific surface area, so as to meet the use requirements of multiple fields; the preparation technique is simple, the operation is convenient, and large-scale production is facilitated; the prepared carbon microspheres with the high specific surface area have an excellent spherical structure, a high degree of sphericity and a controllable particle size, and barely contain metal impurities.

The invention relates to a hydrothermal synthesis method for preparing iron phosphate lithium as an anode material of lithium ion battery, which belongs to the technical field of new energy materials. The hydrothermal synthesis method comprises the following steps of: mixing an iron source with phosphate, adding a lithium source, and after uniform agitation, putting the mixture into a high-pressure reaction kettle; then, adding a reducing agent, and maintaining the temperature at 180-200 DEG C for 8-12 h to produce spherical iron phosphate lithium, wherein the mol ratio of the lithium source to the iron source to the phosphate is 3:1:1. The invention provides a simple and one-step method for directly preparing iron phosphate lithium. The technological parameters of the method used for preparation are easily controlled; compared with a process using ferric iron as a raw material, the resource of ferrous iron as the raw material is wider; the prepared iron phosphate lithium powder particles have small mean particle diameter which is about 3-5 mu m, the particles are evenly distributed, the tap density can reach 2.0-2.5 g/cm<3>, the battery performance is high, and the specific capacity for the first charge and discharge cycle is 140-160 mAh/g.

The invention discloses a lignin-based transition metal/nitrogen doped carbon material, and preparation and application thereof, belonging to the technical field of carbon materials. A preparation method comprises the following steps: (1) uniformly mixing a transition metal salt with lignin in water to obtain a lignin/transition metal salt mixed liquid; (2) subjecting the lignin/transition metal salt mixed liquid to hydrothermal pre-carbonization so as to obtain a hydrothermal pre-carbonization product; and (3) mixing the hydrothermal pre-carbonization product with a nitrogen source, carryingout high-temperature carbonization in a protective atmosphere, and carrying out subsequent treatment so as to obtain the lignin-based transition metal/nitrogen doped carbon material. The lignin-basedtransition metal/nitrogen doped carbon material of the invention has excellent electrochemical performance; and the preparation process of the material is simple, raw materials are widely available and cheap, and an effective way is provided for the high-value utilization of biomass. The carbon material of the invention is applied to fields of fuel cells, supercapacitors, adsorbent materials, and/or water electrolysis.

The invention provides a preparation method for graphene reinforced polymer porous sponge fiber. The preparation method is characterized in that: the graphene reinforced polymer porous sponge fiber is prepared by subjecting an oxidized graphene solution having a certain concentration to ultrasonic processing to obtain a uniformly dispersed oxidized graphene solution; dissolving a polymer in a solvent to obtain a polymer solution with a certain concentration; adding the dispersed graphene solution into the polymer solution under stirring to obtain a graphene-polymer blend spinning solution; spraying the graphene-polymer blend spinning solution through a spinning nozzle into a coagulating bath to form fiber by utilization of a wet-method spinning device; washing with water, reducing, and washing with water again; and quickly subjecting the wet fiber to freeze drying or supercritical drying to obtain the graphene reinforced polymer porous sponge fiber. The preparation method is simple in technology and low in cost, and is suitable for large-scale production. The fiber has advantages of high strength, good antistatic performance, good elasticity, small density, large specific surface area, and the like. The fiber can be used for preparing heat insulating fabrics in the weaving field, and can be used for water treatment in the environment protection field, and the like.

The utility model discloses an improved soda lime sintering method for processing aluminum-containing raw material, and relates to the technical field of aluminum oxide production with a sintering method. The aluminum-containing raw material, limestone and soda ash are evenly mixed in a ball-milling manner according to a raw meal formula of the improved soda lime sintering method, thereby acquiring qualified raw meal; the raw meal is sintered at a high temperature, thereby acquiring sintered clinker; the sintered clinker is dissolved out, desiliconized, resolved and roasted; and an aluminum oxide product can be finally acquired. The raw meal formula of the improved soda lime sintering method is that the sum of the amount of Al2O3, the amount of Fe2O3 and the amount of SiO2 divided by the sum of the amount of Na2O and the amount of K2O is equal to 1.0 plus or minus 0.1 (a molar ratio), and the sum of the amount of SiO2 and the amount of TiO2 divided by CaO is equal to 1.0 plus or minus0.1 (the molar ratio). Compared with the prior art, the improved soda lime sintering method disclosed by the invention has great adaptability to aluminum-containing raw material in various grades, and has the advantages that the addition quantity of burdening lime stone is small, the resource utilization efficiency is high, the sintering temperature is low, the firing energy consumption is low, the firing temperature range is wide, and the industrialization is easy to implement.

The invention relates to a two-stage gasification method and a gasification device for a fuel with wide size distribution. The two-stage gasification method for the fuel with wide size distribution comprises the steps of 1) adding the fuel to a fluidized bed pyrolyzer by a feeding device; adding a gasifying agent to the fluidized bed pyrolyzer; drying/pyrolyzing or partly gasifying the fuel under semicoking of the pyrolyzer and heating of the gasifying agent; and 2) sending the solid and gas generated in the step 1) to a fluidized bed gasification furnace, adding the gasifying agent to the fluidized bed gasification furnace, finishing complete gasification of semicoke; removing tar by high-temperature pyrolysis, part oxidization and semicoke catalytic reforming in the fluidized bed so as to produce clean gas. With the adoption of the method, the traditional fuel gasification process is divided into a material pyrolysis stage and a semicoke gasification stage, which are performed in an upper fluidized bed pyrolyzer and a lower fluidized bed gasification furnace.

The present invention discloses antistatic reinforced polyphenyl thioether composite material and its preparation process. The composite material consists of polyphenyl thioether 30-80 weight portions, glass fiber 20-60 weight portions, inorganic mineral filler 0-40 weight portions, hydrophilic polymer 3-10 weight portions, alkali metal salt 0.2-3 weight portions, interface modifier 2-10 weight portions, coupling agent 0.1-2 weight portions, antioxidant 0.1-1 weight portion, and processing aid 0.1-1 weight portion. The antistatic reinforced polyphenyl thioether composite material has excellent mechanism performance, excellent antistatic performance and high durability, and may be used in coal mine machine, business machine, fixed disk driver, etc.

The invention discloses a method for preparing organic montmorillonite by using solid phase modified Ca-montmorillonite, specifically, the Ca-montmorillonite and a modifier or a mixed modifier are stirred for reaction at high temperature and modified to obtain the organic montmorillonite in solid phase powered state. The obtained organic montmorillonite can be directly applied to a plurality of polymer materials and can realize the intercalation of rubber macromolecule chains in mixing and vulcanizing process. Verified by mechanical property, properties of the obtained composite material, such as tensile strength, modulus, elongation at break and the like, are boosted and excellent. The method has the advantages of wide source of raw materials, handiness and feasibility, low production cost, no need of water or solvent and no environment pollution, with wide industrial application prospect.

The invention discloses a method for preparing a nitrogen-doped modified porous carbon with high specific surface area. The method comprises the following steps: drying and crushing biomass raw materials to obtain granules, and performing high-temperature ammoniation on the granules under an ammonia atmosphere to obtain a nitrogen-containing carbide; then dispersing the nitrogen-containing carbide into an activating agent solution, stirring and drying to obtain an activating agent/carbon mixture; and performing high-temperature activation on the activating agent/carbon mixture under a nitrogen atmosphere, washing, filtering, drying, thus obtaining the nitrogen-doped modified porous carbon material with a high specific surface area. The specific surface area of the prepared carbon material is 2,000-3,500m<2>/g, the pore size of the material is 0.4-8nm, and the nitrogen content is 0.5-5%. The method is simple, effective and easy to operate, facilitates large-scale batch production, and is applicable to industrial production.

The invention relates to a polymer dispersed liquid crystal (PDLC) material which is low in voltage and wide in temperature mode, wherein the material consists of a liquid crystal material, an aliphatic polyurethane acrylate oligomer, an acrylate monomer, a photoinitiator and interstitials. The invention further provides a polymer dispersed liquid crystal display apparatus prepared by using the polymer dispersed liquid crystal material and a preparation method thereof. The polymer dispersed liquid crystal material provided by the invention has the advantages of wide raw material source and simple and convenient preparation process. The PDLC display apparatus prepared from the PDLC material has the advantages of low driving voltage, wide range of working temperature, no shrinkage and deformation and good adhesive force. The preparation method of the PDLC display apparatus is simple and convenient, the thickness of the display apparatus can be adjusted according to size of the interstitials added, and the display apparatus obtained is good in adhesive force and not easy to shrink and deform, so that the PDLC display apparatus with a large area can be probably prepared.

The invention relates to a multifunctional nano composite material of a core-shell structure and in particular relates to a carbon quantum dot magnetic fluorescent difunctional nano material and a preparation method thereof. Magnetic particle Fe3O is taken as a core, chitosan and polyanionic-based cellulose are taken as shell material, a carbon quantum dot is taken as a fluorescent material, and the carbon quantum dot magnetic fluorescent difunctional nano material is obtained by adopting a layer-by-layer self-assembly method; the carbon quantum dot is coated by adopting a natural polymer material, so that no free carbon quantum dot is formed, and stability is improved; magnetic property and fluorescence strength can be regulated and controlled by virtue of number of layers of the shell material and the addition amount of the carbon quantum dot; the obtained magnetic fluorescent difunctional nano material has a broad application prospect in the biological medicine fields of cell marking and absorption, bioimaging, medicine detection and disease diagnosis, medicine carrying and the like.

The invention relates to a preparation method of a petroleum asphalt-based carbon quantum dot. The preparation method comprises the following steps: (1) adding concentrated nitric acid and concentrated sulfuric acid into petroleum asphalt and carrying out ultrasonic treatment to obtain a dispersion liquid of the petroleum asphalt; (2) heating the dispersion liquid of the petroleum asphalt obtained in the step (1) in an oil bath to reflux, cooling to room temperature, regulating to neutral by using alkali and distilled water to obtain a coarse product; and (3) separating and refining the coarse product obtained in the step (2) to obtain the petroleum asphalt-based carbon quantum dot. According to the preparation method provided by the invention, the carbon quantum dot is prepared by taking common petroleum asphalt as a carbon source. The petroleum asphalt is rich in polycyclic aromatic rings and has graphene-like condensed ring structures. After chemical oxidization, besides oxygen-containing functional groups at the edge, a petroleum asphalt nanosheet further has carbine-like zigzag structure and carbine-like armchairs structures.

The invention discloses a high-efficiency flocculant which is composed of the following components in parts by weight: 15-25 parts of polyaluminum silicate sulfate-aluminum potassium sulfate mixture, 5-10 parts of ferric citrate, 3-5 parts of potassium ferrate, 2-5 parts of polyferric chloride phosphate, 5-10 parts of polyferric phosphate, 5-10 parts of polyaluminum chloride, 10-15 parts of soluble coating and 3-5 parts of flocculant activating component. The flocculant activating component is selected from one or combination of expanded perlite micropowder and fly ash micropowder, wherein the weight ratio of the expanded perlite micropowder to the fly ash micropowder is 3:2-5:3. The flocculant disclosed by the invention has the advantages of wide raw material sources, low production cost, low material input, favorable flocculation activating effect and low flocculation processing cost.

The invention discloses a method for preparing a high-content nitrogen-doped porous carbon material. The method includes the following steps: drying and crushing a biomass raw material to obtain granules, performing a high temperature carbonization treatment in a nitrogen atmosphere, and then performing a high temperature ammoniation treatment in an ammonia atmosphere to obtain the high-content nitrogen-doped porous carbon material. The method disclosed by the invention is simple and effective, easy to operate, convenient for large-scale volume production and is suitable for application in industrial production; in a material preparation process, pore forming and nitrogen doping are performed at the same time and are finished in one step, and therefore the method is simple and effective.

The invention discloses a preparation method of an adsorbent for removing phosphorus and heavy metal anions in water as well as an application method, and belongs to the fields of adsorbent technology and environmental pollution remediation. The adsorbent is magnetic water hyacinth biochar, and is prepared by the following steps: water hyacinth is dried and pulverized into powder; a proper amount of the water hyacinth powder and a mixed solution containing Fe2+ and Fe3+ are mixed with continuous stirring, and sodium hydroxide is added dropwisely till the pH value is about 10; after filtering, anaerobic pyrolysis is carried out at 250 DEG C or 450 DEG C, and washing, pumping filtration and drying are carried out in order to obtain the magnetic water hyacinth biochar. The application method is as follows: the biochar is added into waste water containing phosphor, arsenic, antimony and chromium, the initial concentration is 0.05-0.5mM, the dosage is 5g/l, a reaction is carried out for 24 hours at 25 DEG C, and the oscillation rate is 150r/min. The adsorbent is advantageous in that the adsorbent has a large capacity for adsorbing phosphor and heavy metal anions in water, the adsorbent is not easy to agglomerate, and after adsorption, the adsorbent is easy to separate and recycle.

The invention relates to an external traditional Chinese medicine for treating skin diseases. The medicine provided by the invention is composed of paste and tincture, wherein the paste is composed of radix sophorae flavescentis, Chinese violet, coptis, phellodendron bark, rhubarb, cortex dictamni, lithospermum, manyleaf paris rhizome, fructus cnidii, herba patriniae, ampelopsis japonica, fructus kochiae, cynanchum paniculatum, dahurian angelica root, angelica, myrrh, arborvitae tops, pseudo-ginseng, nidus vespae, borax, calamine, vaseline, lanolin and octadecanol; and the tincture is composed of stemona, desmodium, polygonum cuspidatum, phryma leptostachya, garden burnet, golden larch bark, nepal dock root, gallnut, cynanchum paniculatum, felwort, benzoic acid, salicylic acid and 75% ethanol. The external traditional Chinese medicine provided by the invention has the functions of clearing away heat and toxic materials, cooling blood, prompting blood flow, removing beverage, dispersing blood stasis, dispelling wind, eliminating dampness, restraining and sterilizing bacteria, eliminating swelling, relieving itching, dispelling the wind, moistening dryness and killing pests, and the external traditional Chinese medicine has good curative effect on such skin diseases as psoriasis, eczema, dermatitis, tinea corporis, tinea pedis, tinea versicolor and scabies.

The invention discloses a sodium alginate-chitosan double-layer edible membrane as well as a preparation method and an application thereof. The sodium alginate-chitosan double-layer edible membrane isprepared from a sodium alginate membrane and a chitosan membrane through cross-linking compounding. The sodium alginate-chitosan double-layer edible membrane is prepared from a safe and non-toxic material, wide in raw material source, low in production cost and good in membrane forming property, the eating security of an edible inner packaging membrane is improved, through synergetic promotion ofthe components, the air permeability of the membrane is remarkably degraded, the oxygen permeation rate of the membrane is remarkably reduced, the tension property and the transparency of the membrane are remarkably improved, and the membrane is easy to degrade; due to addition of a natural antibacterial agent, microorganism pollution can be very well prevented; the thickness of the membrane canbe controlled by changing the proportioning of the sodium alginate to the chitosan, and then the mechanical properties, the dissolution degree and the antibacterial agent release speed of the membraneare controlled; and the membrane is simple in preparation step, and by adopting the preservative membrane made from the membrane disclosed by the invention, moisture loss and microorganism pollutionin the transportation, storage and processing process of fruits and vegetables can be reduced.

The invention relates to a preparation method and application of a TiO2-loaded biochar composite material.The composite material takes biochar as a base body, and the surface of the base body is loaded with calcined TiO2.The preparation method specifically comprises the steps that biomass powder is firstly immersed into an aqueous tetra-n-butyl titanate and absolute ethyl alcohol solution, then gel containing biomass is prepared, and finally the gel is pyrolyzed through a tubular atmosphere furnace in a N2 atmosphere to obtain the product.In the preparation process of the TiO2-loaded biochar composite material, pyrolysis of the biomass and calcination of the TiO2 are performed in the same heat treatment process, therefore, the preparation cost is reduced, and the preparation time is shortened.The product has the good degrading effect on dyes in wastewater.

The invention provides a special composite oil phase for an emulsion explosive and a preparation method thereof, which belong to the technical field of explosive composition. The composite oil phase comprises Span-80, soybean lecithin, vaseline, a microcrystalline wax, a paraffin wax and a composite wax, wherein during producing the emulsion explosive, an emulsion and a blending wax are melted after being mixed or mixed after being melted according to a mass ratio of 1:2 so as to obtain the special composite oil phase for the emulsion explosive. By using the composite oil phase provided by the invention, the problems of low performance, over-quickness for damping detonation capacity as well as short storage period of the traditional emulsion explosive are solved; and the special composite oil phase for the emulsion explosive, provided by the invention, can be used for producing the special composite oil phase materials for the emulsion explosive.

The invention discloses a natural plant material hollow cigarette filter rod as well as a preparation method and application thereof. The hollow cigarette filter rod is prepared by the following steps: uniformly mixing a natural plant particle material with a binder; squeezing into a cake by moulding equipment; mechanically cutting and grinding the obtained cake into a cylinder; and further perforating the cylinder along a central axis. The preparation method has the advantages of low equipment requirements, simplicity in operation, cheap raw materials and low production cost; and the prepared hollow cigarette filter rod has high safety performance, is environment-friendly, has the adsorption interception function of a common acetate fiber hollow filter rod, and can realize an aroma enhancement effect.

The invention relates to a method for preparing cobalt-free black ceramic pigment by using copper ore tailings and a product manufactured by using the same. The method adopts the following industrial chemical raw materials and industrial waste slag copper tailings in percentage by weight: 10-20 percent of copper tailings, 25-35 percent of iron oxide, 26.9-30 percent of chromic oxide, 7-10 percent of nickel oxide and 15-25 percent of copper oxide. The product is obtained by mixing, calcining, pulverizing, washing, drying, pulverizing and drying, wherein the calcining temperature is 1,180-1,250 DEG C, and the temperature is kept for 60 minutes. Spinel particles which are CuCr2O4, Fe3O4 and Cr2NiO4 formed by solid phase reaction and black iron-nickel olivine sosoloid completely absorb visible light in the wavelength range of 380-780nm, thereby obtaining the black ceramic pigment product with stable color and pure chroma. The product can be widely applied to decorate various daily and architectural ceramics and is significant for the resource utilization of copper tailing waste slag materials.

This invention discloses a process for producing concocted fuel oil that can replace petrochemical diesel oil for application in automobiles, boilers, air conditioners and electricity generators. The concocted fuel oil is composed of: standard diesel oil 50-70 wt. %, additives 0.05-0.3 wt. %, and acidified oil or fatty acid or a composition of acidified oil and methanol. The additives comprise: cetane number improver (isooctyl nitrate) 60-70 wt. %, and cleaning agent (fatty acid succinimide or cyclohexylamine) 30-40 wt. %. The process comprises: mixing standard diesel oil and additives to prepare mother diesel oil, and mixing with acidified oil or fatty acid or a composition of acidified oil and methanol to obtain concocted diesel oil. The concocted diesel oil has such advantages as abundant raw materials, simple formula and low cost, and is a high-quality substitute for petrochemical diesel oil.

The invention discloses a simple vanadium nitride production method, which comprises the following steps of: (1) fully mixing vanadium pentoxide (V2O5) powder and graphite powder in a weight ratio of 4:1 on a dry mixer; (2) adding 4 percent of polyvinyl alcohol aqueous solution into mixed powder in a weight ratio of 100 to 15, and mixing the polyvinyl alcohol aqueous solution and the mixed powderin a wet mixer for 10 minutes; (3) carrying out ball pressing on the wet-mixed mixed powder; (4) drying wet balls of the mixed powder; (5) loading the dried balls of the mixed powder into a charging vehicle in a layered mode and then into a furnace, and sealing a furnace door; (6) vacuumizing until a pressure is equal to -0.02 megapascal (MPa); (7) introducing nitrogen until the pressure is equalto 0.04 MPa; (8) heating to 800 DEG C, and carrying out pre-reduction for about 5 hours at the temperature; (9) then keeping heating to 1,350 DEG C, continuing deep reduction and carbonization for atleast 6 hours, and continuously introducing the nitrogen with the purity of over 99.99 percent in process; and (10) carrying out nitridation sintering for 6 to 10 hours after the temperature rises to1,600 DEG C, controlling the pressure to 0.02 MPa in the process, cutting off power for cooling, and taking vanadium nitride out of the furnace until the temperature is equal to 150 DEG C.

The invention relates to a red mud soilification repairing agent and an application method thereof, and belongs to the technical field of ecological restoration of a red mud yard. Main raw materials of the repairing agent are industrial and municipal solid wastes and agricultural waste biomass powder, and raw materials are wide in sources and low in prices. By evenly ploughing the repairing agentand red mud, and then watering and ripening, the red mud soilification improvement can be realized in a short time, so that the red mud has resistant crop growth conditions and the natural ecologicalenvironment of the red mud yard and its surroundings can be improved. The technique has the advantages of simple application method, small engineering quantity and low cost.

The invention provides a full recycling method for producing methane and biogas residue activated carbon by utilizing medicine herb residue, and belongs to the technical field of biomass waste resource utilization. The method comprises the steps of smashing the medicine herb residue, performing alkaline pretreatment, inoculating anaerobic sludge naturalized for a long time, then performing anaerobic methane fermentation, wherein the inoculation ratio is 1 to 1 (TS ratio). The methane-fermented solid residue is prepared into the biogas residue activated carbon by two-step-method pyrolysis under a high temperature pipe furnace nitrogen atmosphere. The method explored by the invention is a method for medicine herb residue gradient utilization; the biogas residue activated carbon is prepared by utilizing biogas residue difficult to degrade after the methane fermentation, so that full resource utilization of herb residue of lignocellulose is realized, not only is the cost of producing methane and the activated carbon saved, but also the discharge of the biogas residue is reduced, and good economic benefit and environmental benefit are obtained.

The invention discloses a method of assembling an MOF (Metal-Organic Framework)/nitrogen-doped active carbon asymmetric supercapacitor device. The method of assembling an MOF/nitrogen-doped active carbon asymmetric supercapacitor device is characterized in that taking an MOF structure as a precursor to prepare metal oxide so as to take the metal oxide as the anode material of a supercapacitor; taking conductive hydrogel as a precursor to prepare porous nitrogen-doped porous active carbon as the cathode material of the supercapacitor; taking PP paper as a diaphragm and using aqueous electrolyte; and according to a cell shell/ anode material/diaphragm/cathode material/cell sandwich structure, assembling the above materials into a button type asymmetric supercapacitor device. The method of assembling an MOF/nitrogen-doped active carbon asymmetric supercapacitor device has the advantages of being simple, environmentally-friendly and reliable in the preparation process, being wide in the source of raw materials, and being low in the cost of the raw materials. Besides, the assembled supercapacitor device is wide in the potential window and is high in the cycle performance; and the aqueous electrolyte is safe and has no danger of liquid leakage, inflammability and vulnerability to pollution. Therefore, the supercapacitor device is an ideal environmentally-friendly supercapacitor device, and is specifically suitable for industrial production.

The invention discloses an artificial light fiber plate and a preparation method thereof, consisting of cottonwood, willow, platane wood (wood material), fruit trees, locusts, benfite, phenolic-resin glue, wax, aluminum sulphate, whitener and reinforcer. The preparation method comprises the steps of (1) selection and slicing of wood; (2) stewing and hot grinding; (3) material mixing and pulp preparation; (4) forming of slab; (5) secondary dehydration; (6) baking and shaping; (7) coating protection layer on the plate surface (8) grinding and thickness fixing; (9) spraying the protection layer on the back surface of the plate; (10) obtaining a finished light fiber plate through trimming and packaging. The compounded raw material of the invention is easy to be obtained; trees and branches can be taken as main raw material wood; the invention has the advantages of low price, wide source of raw material, low cost of product, having superiority of market competitiveness, reaching the performance level of abroad similar product, simple process of the preparation method, draining no polluted water, no environmental pollution in the whole process, being the improvement of wet-method plate preparation and meeting corresponding requirement of environmental protection.

The invention belongs to the technical field of natural product preparation and especially relates to a method for adsorbing and recovering heavy metals of lead and copper by a persimmon tannin-containing metal adsorbent. The method can be widely used for adsorbing and removing lead and copper ions in waste water and has the advantages of low cost, large adsorption capacity, good environmental benefits and convenient operation. The method is characterized by comprising the following steps of 1, respectively adding a persimmon tannin-containing metal adsorbent and a lead or copper-containing mixed solution having a pH value of 4 to 6 into a reaction vessel according to a ratio of persimmon tannin-containing metal adsorbent mass (by mg) to lead or copper-containing mixed solution volume (by mL) of 1: (3 to 5), wherein the volume of the used lead or copper-containing mixed solution is less than or equal to half of the volume of the reaction vessel, 2, putting the reaction vessel into a shaking table, 3, carrying out shaking adsorption at a shaking-table rotation rate of 100 to 200rpm at a temperature of 10 to 50 DEG C for 12 to 24h, and 4, carrying out filtration so that the lead or copper ions can be reduced into metals and retained in the persimmon tannin-containing metal adsorbent. The method also can be used for adsorbing or recovering lead and copper in waste water by a chromatographic column.

The invention discloses a method for preparing chitin nano filaments, relates to the method for preparing the nano filaments and solves the problems that the chitin nano filaments prepared by the conventional method for preparing the chitin nano filaments are short and cannot meet the market demand. The method for preparing the chitin nano filaments comprises the following steps of: 1, pretreating biological raw materials; 2, partially deproteinizing; 3, removing mineral salt; 4, further deproteinizing; 5, degreasing; 6, removing pigments; 7, preparing nano filament dispersion liquid; and 8, preparing the chitin nano filaments. A product prepared by the method for preparing the chitin nano filaments can be applied to the fields of biological medicine, tissue engineering, optical devices and nano templates.