200 results about "Oyster shells" patented technology

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 discloses a preparation method and permeation promotion application of a high-purity sponge bone needle, and belongs to the technical field of sponge bone needles. Comprising the following steps: cutting a natural sponge into pieces, soaking in deionized water, carrying out ultrasonic oscillation, filtering, and cleaning to obtain a pretreated sponge; carrying out enzymolysis on the pretreated sponge with alkaline protease to obtain a primary zymolyte; and carrying out enzymolysis with ginger protease to obtain a secondary enzymolysis product, and carrying out vacuum freeze drying to obtain the high-purity sponge spicule. The natural sponge is subjected to enzymolysis treatment through alkaline protease and ginger protease, and the high-purity sponge spicule is obtained; wheat oligopeptide is grafted on the surface of a sponge spicule, and giant salamander skin collagen, a pomegranate seed extract, a lonicerae flos extract, a centella asiatica extract, an early celery extract, an iris tectorum extract, an oyster shell extract and calcium chloride mixed treatment materials are loaded, so that the repairing effect on skin inflammation acne is improved.

The invention relates to the technical field of agriculture, provides a red soil hardening reduction conditioner based on modified straw adsorption carbon as well as a preparation method and application thereof, and solves the problems that an existing red soil hardening conditioner is poor in soil improvement effect and does not have a slow release function. Comprising the following steps: (1) preparing oyster shell-biochar composite powder; (2) loading functional components; (3) directional immobilization of microorganisms; (4) coating a slow-release layer; (5) activating treatment; the red soil hardening reduction conditioner is prepared from the following raw materials in parts by weight: 80 to 100 parts of oyster shell powder, 100 to 200 parts of modified straw adsorption carbon, 10 to 30 parts of rice hull powder, 30 to 50 parts of nano dihydrate gypsum, 100 to 200 parts of a polyglutamic acid solution, 10 to 50 parts of acid-resistant bacillus, 15 to 30 parts of sodium alginate, 30 to 60 parts of humic acid, 10 to 30 parts of carbide slag and 30 to 60 parts of attapulgite.

The invention relates to a high-carbon biological organic conditioner and application thereof in red soil peanut planting, the high-carbon biological organic conditioner comprises mineral powder, oyster shell powder, zeolite powder, potassium fulvic acid, decomposed cow dung, alanine and glycine according to a mass part ratio of 800: 200: 10: 50: 140: 0.7: 0.5, the content of organic matters in the high-carbon biological organic conditioner is not less than 45 wt.%, the content of humic acid is 20 wt.%, the content of potassium fulvic acid is 20 wt.%, and the content of potassium fulvic acid is 20 wt.%. And bacillus subtilis is contained. By applying the high-carbon biological organic conditioner, the soil quality of the red soil peanut planting area is rapidly improved, the peanut yield is remarkably increased, and an effective technical solution is provided for agricultural sustainable development of the red soil area.

Disclosed is a device and an associated method for promoting the formation of oyster reefs. The device includes a number of interconnected wire enclosures. The wire enclosures house non-living oyster shells. These oyster shells attract oyster larvae and promote reef formations. The enclosures are preferably interconnected to form a closed pen with the bottom of the pen formed by a biodegradable mesh netting. Additional non-living oyster shells can be positioned over top of the netting. The wire enclosures serve to protect larvae that attaches to the oyster shells. This, in turn, ensures that oyster reef formations are promoted.

The invention relates to the technical field of acid soil treatment and improvement, in particular to a soil conditioner suitable for acid yellow red soil and a soil improvement method. The soil conditioner provided by the invention is prepared from the following components in percentage by weight: 10 to 20 percent of humic acid loaded biochar, 40 to 50 percent of modified organic fertilizer, 15 to 25 percent of biogas residue, 8 to 12 percent of oyster shell powder, 3 to 5 percent of functional microbial agent and 2 to 3 percent of water-retaining agent. The soil conditioner disclosed by the invention can better improve acid soil, and meanwhile, compared with traditional lime, the soil conditioner disclosed by the invention has longer duration time.

The invention discloses an oyster shell modified walnut shell carbon core-shell composite microsphere adsorbent, a preparation method and application thereof in fluorine-containing wastewater treatment. The preparation method of the core-shell composite microsphere adsorbent comprises the following steps: (1) adding mixed powder of walnut shells and oyster shells in different mass ratios into deionized water for dipping, drying after dipping, pyrolyzing in an inert atmosphere, washing a product to be neutral after pyrolyzing, and drying to prepare oyster shell modified walnut shell carbon; and (2) slowly adding the oyster shell modified walnut shell carbon into a sodium alginate solution, uniformly stirring to obtain a mixture, dropwise adding the mixture into a calcium chloride solution for crosslinking, and washing and drying a product to obtain the oyster shell modified walnut shell carbon core-shell composite microsphere adsorbent. The oyster shell modified walnut shell carbon core-shell composite microspheres prepared by the preparation method disclosed by the invention have proper size, good mechanical strength and excellent adsorption performance.

The invention discloses a preparation method and application of a biochar-coated LDH-oyster shell-microbe composite material, and belongs to the technical field of soil remediation. The preparation method comprises the following steps: preparing a biochar-CaFe LDH composite material by a hydrothermal coprecipitation method, modifying an oyster shell passivation material, using the modified oyster shell passivation material as a bacillus subtilis immobilization carrier, and preparing the biochar-LDH-oyster shell-microorganism composite material. According to the method, a combined remediation technology is adopted, the excellent characteristics of the biochar are fully utilized, and more point locations are provided for microorganism loading by changing the properties of the oyster shells. The prepared composite material has a good passivation effect on different ion types of heavy metals such as cadmium, lead, arsenic and chromium in soil, the defects of a single remediation method or a remediation material are overcome, multiple heavy metals in the soil are treated at the same time, and the remediation efficiency is improved.

The invention discloses an acidified soil conditioner and a preparation method thereof. The preparation method of the conditioner comprises the following steps: preparing a nano composite material: drying and crushing oyster shells, sieving and calcining to obtain oyster shell powder, namely the nano composite material; the preparation method comprises the following steps: preparing composite biochar powder: drying and grinding cleaned agricultural waste rice straws into powder, and carrying out sieving and calcining treatment to obtain straw biochar; mixing alkaline phosphate, sulfide, hemi-ferrite, manganese salt, clay, a microbial agent and straw charcoal in proportion to obtain composite charcoal powder; and preparing the acidified soil conditioner: compounding the nano composite material and the composite charcoal powder in proportion, and carrying out molding treatment on the complexing agent powder to obtain the acidified soil conditioner. The method has the beneficial effects that the available heavy metals in the soil can be reduced, the cation exchange capacity of the soil is enhanced, the acidification is neutralized, the soil fertility is improved, and the heavy metal pollution of the acidified farmland is repaired.

The processing method comprises the following steps: (1) taking a dried radix astragali medicinal material, removing impurities, separating the radix astragali medicinal material according to different sizes, performing high-temperature steam treatment, slicing, and drying at the temperature of 60-70 DEG C to obtain radix astragali decoction pieces; (2) performing ultrasonic treatment in 60% ethanol for 60 minutes, and recovering ethanol to obtain clean astragalus tablets; (3) 25 parts of refined honey is taken and diluted with boiled water with the amount two times that of the refined honey, 3-7 parts of oyster shell powder is added, then 100 parts of clean radix astragali slices are added, the mixture is stirred to be uniform and braised thoroughly, the mixture is placed in a pot to be stir-fried to be deep yellow and not sticky to hands, the mixture is taken out and cooled, and the finished radix astragali roasted with honey is obtained.The honey can be prevented from being coked in the radix astragali processing process, more flavonoid components can be reserved, and the anti-oxidation and anti-inflammatory effects of the honey can be achieved; saponin and polysaccharide can be reserved, and the effects of tonifying qi, raising yang, invigorating the spleen and tonifying the lung are achieved.

The invention discloses an antibacterial PVC plate containing oyster shells and a preparation method of the antibacterial PVC plate, and relates to the technical field of PVC plates. The preparation method comprises the following steps: 1, sequentially loading zinc and silver on oyster shell powder to obtain an oyster shell antibacterial agent; step 2: (1) compounding the oyster shell antibacterial agent with molybdenum oxide to obtain a composite filler; (2) pretreating the composite filler with a coupling agent to obtain a modified composite filler; and 3, uniformly mixing polyvinyl chloride resin, maleic anhydride modified polyvinyl chloride, the modified composite filler, a heat stabilizer, a lubricant, a plasticizer, an initiator and a foaming agent, carrying out melt extrusion, and pressing into a plate, thereby obtaining the antibacterial PVC plate. The prepared antibacterial PVC board not only has excellent antibacterial property, but also has excellent mechanical property and flame retardance.

The invention provides a soil conditioner for heavy metal contaminated soil and a preparation process of the soil conditioner, and belongs to the technical field of soil remediation. The preparation process comprises the following steps: preparing Fe3O4 (at) ZnO; preparation of sulfonated humic acid-chitosan coated Fe3O4 (at) ZnO; preparing matured compost; and preparing the soil conditioner. The sulfonated humic acid-chitosan coated Fe3O4 (at) ZnO, the matured compost and the oyster shells are mixed with one another, so that the air permeability and the water permeability of the soil can be improved, the water and fertilizer retention capacity of the soil can be enhanced, heavy metals can be adsorbed and fixed by the sulfonated humic acid-chitosan coated Fe3O4 (at) ZnO, the bioavailability of the heavy metals can be reduced, and the soil fertility can be improved. The risk of migrating into the plant body is reduced, the quality safety of agricultural products is guaranteed, and meanwhile, the remediation and improvement of the soil environment are also facilitated.

The invention discloses a preparation method of a composite biological nitrogen and phosphorus removal filter material, and relates to the technical field of sewage treatment. The preparation method of the composite biological nitrogen and phosphorus removal filter material comprises the following steps: loading sulfur and pyrite with oyster shells to prepare an integrated composite biological carrier with a foaming structure; sulfur loaded in the oyster shells can provide electrons for the denitrification nitrogen removal process; pyrite in the structure is rich in iron element, and can also participate in auxiliary phosphorus removal while providing nitrogen removal electrons; meanwhile, the foamed porous structure of the novel filter material is also beneficial to improving the specific surface area of a carrier, and bacteria can be efficiently and rapidly enriched; according to the present invention, the oyster shell is adopted as the carrier of the filler, the organic matter component is adopted as the slow release carbon source to provide a part of electrons so as to achieve heterotrophic denitrification, and the calcium carbonate component in the oyster shell can provide alkalinity so as to make up the insufficient alkalinity problem during the autotrophic denitrification process;

The invention relates to the technical field of agricultural resources and environment, and particularly discloses a rapid fertilization improvement method for newly-reclaimed red soil dry land. The method systematically integrates the core steps of soil diagnosis aluminum toxicity passivation, composite conditioner deacidification, two-stage deep ploughing, organic and inorganic biological synergistic fertilization, soil moisture content regulation and control, earth surface covering, green manure planting and returning to the field and the like. The applied composition comprises a soil composite conditioner, a charcoal-based organic fertilizer and a specific functional microbial agent, wherein the soil composite conditioner comprises modified oyster shell powder, a calcium magnesium phosphate fertilizer, humic acid, polyglutamic acid and the like. The method relates to key processes such as temperature programming calcination modification of raw materials, co-pyrolysis and composite granulation of the materials and the like. The method can synchronously and quickly improve the chemical and biological properties of soil and optimize the physical structure of a plough layer, and has the advantages of high improvement targeting, synergistic interaction of all steps, high fertilizing speed and lasting effect; in addition, the method has the advantages of being coherent in process, high in resource utilization efficiency and easy to implement on a large scale.

The invention discloses an organic-inorganic composite acid soil conditioner with synergism of nitrogen element synergism and soil expansion and application, and belongs to the technical field of soil conditioners. The modifier prepared by the invention is prepared from an acid neutralizer, a structure modifier, a capacity expansion synergist and a nitrogen synergist and is prepared from the following components in parts by weight: 18 to 22 parts of dolomite powder, 6 to 10 parts of lime powder, 20 to 24 parts of oyster shell powder, 8 to 12 parts of humic acid, 4 to 8 parts of sargassum, 1 to 3 parts of sodium alginate, 7 to 11 parts of charcoal, 5 to 9 parts of sepiolite powder, 3 to 7 parts of bentonite, 6 to 10 parts of poly gamma-calcium glutamate and 3 to 7 parts of chitosan. The soil conditioner can regulate and control the soil acidity, buffer the soil capacity, improve the soil structure and balance soil nutrients, solves the problems of high re-acidification rate, soil hardening and nutrient imbalance of a traditional lime conditioner, and is suitable for pHlt; and 6.5, repairing the acid soil.

The invention discloses an oyster shell reinforced polyvinyl chloride plate and a processing technology thereof, and relates to the technical field of polyvinyl chloride. The preparation method specifically comprises the following steps: S1, preparing polyvinyl chloride, oyster shell powder, a heat stabilizer, a plasticizer, a lubricant and an antioxidant as raw materials for later use; s2, calcining and modifying the oyster shell powder to obtain enhanced oyster shell powder; s3, sequentially putting the enhanced oyster shell powder and other raw materials into a high-speed mixer, uniformly mixing, plasticizing and extruding through a double-screw extruder, pulling into sheets, putting into a mold, calendaring into a plate, and cutting to obtain an oyster shell enhanced polyvinyl chloride plate; the oyster shell reinforced polyvinyl chloride plate prepared by the invention has excellent impact strength and flame retardant property, and has good moisture and heat retention rate, antibacterial property and lower density.

The invention discloses oyster shell-starch sludge carbon quantum dots and application thereof as a pepper growth promoter, and belongs to the technical field of organic fertilizers, soil improvement and waste utilization. Comprising the following steps: crushing oyster shells, mixing the crushed oyster shells with starch sludge, performing hydrothermal reaction, centrifuging, taking supernate, dialyzing, freezing and drying. The promoter can be used for enhancing photosynthesis of pepper leaves, promoting growth and yield increase of pepper in saline-alkali soil, and can be used as a promoter for growth and yield increase of pepper in saline-alkali soil. The plant height, stem diameter, leaf length, leaf width and fresh weight of the pepper treated by the oyster shell starch sludge carbon quantum dots are obviously improved. The maximum quantum yield, the actual photosynthesis efficiency, the absolute electron conductivity and the non-photochemical quenching coefficient of pepper plants can be obviously improved. The plant height, stem diameter, leaf area and single plant yield of pepper plants can be obviously improved when the fertilizer is applied to the field. After the calcium-doped carbon quantum dots are treated, the growth and development of the saline-alkali soil peppers are promoted, the photosynthesis of the saline-alkali soil peppers is promoted, and the yield of the peppers is increased.

The invention relates to the technical field of improvement of coastal saline-alkali land, in particular to a soil conditioner for salt-control fertile soil of coastal fishery reclamation saline-alkali land and a preparation method of the soil conditioner. The invention relates to a soil conditioner for salt-control fertile soil of coastal fishery receding reclamation saline-alkali land. The soil conditioner comprises the following raw material components in parts by mass: 40-60 parts of urea, 25-45 parts of calcium superphosphate, 30-45 parts of potassium sulfate, 20-25 parts of modified oyster shell powder, 10-15 parts of humic acid, 3-5 parts of a compound microbial agent, 10-20 parts of desulfurized gypsum and 25-35 parts of a biochar composite material, the biochar composite material is prepared from the following raw material components in parts by mass: 1 to 2 parts of sodium alginate, 1 to 2 parts of chitosan, 3 to 8 parts of biochar, 1 to 5 parts of calcium chloride, 10 to 20 parts of tuff stone powder, 0.25 to 2 parts of acidified attapulgite, 0.01 to 0.08 part of graphene oxide, 1 to 5 parts of ferric nitrate, 0.6 to 3 parts of copper nitrate and 0.1 to 0.5 part of silane coupling agent. By adopting the soil conditioner prepared by the invention, the pH value of soil, the volume weight of the soil and the total amount of water-soluble salts can be remarkably reduced, meanwhile, the organic matters of the soil are increased, and the porosity of the soil is increased.

The invention belongs to the field of breeding, and particularly relates to a feed for breeding lumbricus and a preparation method of the feed. The corn straw, the decomposed cow dung and the pseudo-ginseng dregs are used as core raw materials, and functional additives such as the oyster shell powder and the beer yeast paste are used as auxiliary materials, so that the carbon nitrogen ratio and trace elements (such as selenium) are optimized, and the nutritional and medicinal values are ensured. Wherein after the pseudo-ginseng decoction dregs are mixed with the honey water for fermentation, other components in the feed are supplemented, so that the growth of the pheretima can be effectively promoted, and the medicinal value of the pheretima can be improved. The main raw materials are pretreated and then mixed with the auxiliary materials to build a pile for fermentation, temperature-controlled pile turning is performed, pH is adjusted, efficient degradation and sterilization are achieved, and the feed capable of promoting growth of the lumbricus and improving the medicinal value of the lumbricus is obtained.

The invention provides a preparation method of artificial oven subsoil. The preparation method comprises the following steps: firstly, mixing shrub ash, rice hull ash and wormwood ash in proportion to prepare plant ash, then mixing calcined and crushed oyster shells and plant ash, adding water, washing and removing impurities to prepare mortar, and then adding loess powder for injection molding; drying at the temperature of 250-350 DEG C, oxidizing at the temperature of 450-650 DEG C and reducing at the temperature of 750-850 DEG C to finally obtain the artificial oven subsoil. According to the method, the natural production process of traditional oven subsoil is simulated, the compound structure and effective component composition of the natural oven subsoil are successfully reproduced, the obtained product is stable in component and quality, the content of heavy metal and pesticide residues meets the safety standard, and the problems that natural resources are exhausted, and the quality of the oven subsoil all over the country is uneven are effectively solved.

The application relates to the technical field of soil remediation, and particularly discloses a composite soil remediation agent, a preparation method and application thereof.A composite soil remediation agent comprises modified calcined oyster shell, plant biomass carbon, bone charcoal, compost, microbial preparation and ferrous sulfide; the preparation of the modified calcined oyster shell comprises the following steps: crushing, calcining oyster shell, and then adding a modified solution prepared from urea, rhamnolipid, iminodisuccinic acid tetrasodium and sodium dodecylbenzenesulfonate to modify the calcined oyster shell, so that the modified calcined oyster shell is obtained.The composite soil remediation agent can effectively adsorb and fix heavy metals in slightly heavy metal contaminated soil, reduce the mobility and bioavailability of the heavy metals, and thus reduce the harm of the heavy metals to soil and crops.

The invention discloses a method for preparing isostearic acid by hydrogenation of a bio-based carrier catalyst, and relates to the technical field of oleochemical engineering and catalyst preparation, and the method comprises the following steps: S1, preparing a bio-based supported catalyst; s2, taking isomerized oleic acid as a raw material, and carrying out catalytic hydrogenation reaction under the action of a catalyst; s3, separating a product obtained after the hydrogenation reaction to obtain isostearic acid; according to the method for preparing isostearic acid by hydrogenation of the bio-based carrier catalyst, oyster shells are selected as a catalyst carrier, and specific pretreatment and high-temperature firing are performed, so that waste biomass resources are converted into a high-specific-surface-area calcium oxide carrier with a natural nanoscale sheet-shaped superposed three-dimensional space structure; high-value utilization of waste resources is achieved, so that the effects that the cost of raw materials of the catalyst is remarkably reduced and the carrier is environmentally friendly are achieved, and the high-activity non-noble metal hydrogenation catalyst is obtained by adopting copper nitrate solution impregnation and combining with a loading mode of subsequent hydrogen reduction.

The application relates to a horizontal subsurface flow constructed wetland system capable of adding agricultural biomass carbon sources, and belongs to the technical field of environmental protection and water treatment technology. The system comprises a water inlet collecting area, a carbon source adding unit arranged in the water inlet collecting area, a ceramsite type wetland unit connected with the water inlet collecting area, a brick slag type wetland unit connected with the ceramsite type wetland unit, a zeolite type wetland unit connected with the brick slag type wetland unit, an oyster shell type wetland unit connected with the zeolite type wetland unit, and a water outlet collecting area connected with the oyster shell type wetland unit. Plants are planted on the ceramsite type wetland unit, the brick slag type wetland unit, the zeolite type wetland unit and the oyster shell type wetland unit. Agricultural wastes are arranged in the carbon source adding unit. Water in the water inlet collecting area enters the ceramsite type wetland unit through the carbon source adding unit and a water passing assembly. The application has the effects of maintaining sufficient carbon sources in the wetland system, applying agricultural wastes to the water treatment wetland system, and improving the utilization rate of the agricultural wastes.

The present invention relates to a heating panel using a carbon fiber heating element and an SPC flooring material and a method for manufacturing the same. More specifically, the invention relates to a heating panel using an improved carbon fiber heating element and an SPC flooring material and a method for manufacturing the same, wherein the heat conduction efficiency is maximized by integrating a carbon fiber-based heating element inside an SPC (Stone Plastic Composite) flooring material, heat loss is minimized through a multi-layer structure including a functional layer based on oyster shells, electromagnetic waves and sparks are suppressed, and the construction process is drastically simplified.

The invention discloses a drinking water targeted sterilization and disinfection device based on an asymmetric vacancy catalytic material and application of the drinking water targeted sterilization and disinfection device to removal of pathogenic microorganism polluted water, and relates to the technical field of water treatment. The device comprises a raw water tank, a peristaltic pump, a filter column, an aeration pump, an aeration diffuser and a clean water tank, the filter column comprises a column body, an asymmetric vacancy catalytic material, a bearing plate, a gravel filler and an oyster shell filler, a bearing plate is arranged at the bottom of the column body, and a gravel filler, an oyster shell filler and an asymmetric vacancy catalytic material are sequentially arranged on the bearing plate from bottom to top. According to the invention, an asymmetric vacancy catalytic material is precisely constructed, an electron polarization effect is induced, and a filter column drinking water treatment device is combined, so that a novel RO / 1O2 synergistic oxidation disinfection technology which is efficient, targeted and low in byproduct generation is constructed. Safety guarantee is provided for rural distributed water supply, the safety and reliability of rural drinking water can be comprehensively improved, and sustainable development of rural drinking water safety engineering is promoted.

1. Name of this product design: Multifunctional Oyster Knife. 2. The intended use of this design is for prying open oyster shells, cutting snails, and opening bottle caps. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The present application relates to the field of agricultural technology, and provides a preparation method of a straw-derived organic calcium conditioner and application of the straw-derived organic calcium conditioner in red soil hardening repair, solves the problem that existing conditioners do not have a slow-release effect, and the effect of red soil hardening reduction, acid improvement and crop yield increase after application of the conditioner is poor, and comprises the following steps: S1, raw material pretreatment and compounding: pulverizing rice straw and mixing the rice straw with oyster shell powder to obtain mixed raw materials; S2, pyrolysis treatment is performed on the mixed raw materials, and volatile components generated in the pyrolysis process are recovered through a condensation system; S3, organic acid activation: the pyrolysis and carbonization products are mixed with an organic acid activation liquid to obtain activated carbonization products; S4, chimeric and mechanical activation: the activated carbonization products are mixed with polyethylene glycol and subjected to ball milling treatment; S5, polymer cross-linking reaction: polyvinyl alcohol and citric acid are added and mixed for reaction; and S6, shaping and granulation: shaping treatment is performed to obtain the straw-derived organic calcium conditioner.

The invention discloses a PVC fireproof plate prepared from oyster shells and a preparation method of the PVC fireproof plate, and relates to the technical field of PVC fireproof materials. The preparation method comprises the following steps: step 1, pretreating the oyster shell powder, and reacting quaternized chitosan with epoxidized soybean oil to obtain enhanced oyster shell powder; 2, the oyster shell powder is pretreated, benzophenone chitosan and epoxidized soybean oil are subjected to a reaction, and anti-ultraviolet oyster shell powder is obtained; and step 3, uniformly mixing the raw material components of the PVC fireproof plate according to the formula proportion, adding the mixture into a conical twin-screw extruder, and carrying out mixing extrusion, mold shaping, traction and cutting to obtain the PVC fireproof plate. The prepared PVC fireproof plate has excellent heat resistance, mechanical properties and ultraviolet resistance.

The invention discloses a method for preparing water-soluble oyster powder through enzyme-acid hydrolysis. The method comprises the following steps: step 1, cleaning and drying oyster shells, and grinding and sieving the oyster shells to prepare oyster shell powder; step 2, carrying out two times of enzymolysis on the oyster shell powder by using neutral protease to prepare enzymatic hydrolysate; 3, adding acetic acid into the enzymatic hydrolysate for reaction, and filtering to obtain filtrate; and 4, refrigerating the filtrate at an ultralow temperature, and performing freeze-drying treatment to obtain the water-soluble oyster powder. The water-soluble oyster powder is prepared by adopting a safe and efficient enzyme-acid hydrolysis method, so that the absorption rate and the bioavailability of calcium in oyster shells by a human body are effectively improved. Meanwhile, optimal preparation process parameters of the preparation method are obtained through a large number of experiments, the calcium content of the obtained water-soluble oyster powder solid powder reaches 90.12%, the amino nitrogen content is 20.0 mg / g, the solubility is improved to 42.56 g / 100 ml, and the preparation method has very important significance on further expanding resource utilization of waste oyster shells.

The invention relates to the technical field of bio-organic fertilizers, in particular to a bio-organic fertilizer and a preparation method thereof. The bio-organic fertilizer is prepared from the following raw materials in parts by weight: 60-80 parts of a base material, 20-30 parts of an auxiliary material, 10-20 parts of powder, 8-12 parts of a paste material and 1-3 parts of a complex microbial inoculant, the base material is a mixture of straws, coconut shells, peanut shells, bean dregs, distillers' grains and sawdust. According to the biological organic fertilizer disclosed by the invention, powder is added in the preparation process of the biological organic fertilizer, and a calcium carbonate component of oyster shells is utilized, so that rich calcium elements can be provided for plant root systems after the fertilizer is applied, and the stability of the plant root systems is facilitated; the boron element can influence the community structure and diversity of soil microorganisms, can help plant root systems to absorb nutrients, enhances the nutrient supply of the bio-organic fertilizer to plants, and effectively improves the use effect of the bio-organic fertilizer.