262 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 discloses a slow-release phosphorus removal material and a preparation method and application thereof, and belongs to the technical field of sewage treatment, the slow-release phosphorus removal material comprises the following components by mass: 40-55 parts of calcium peroxide, 25-35 parts of a binder, 2-5 parts of bentonite, 5-20 parts of calcined oyster shell powder, and 10-25 parts of iron-loaded modified red soil; the binder is prepared from Portland cement, polyacrylic acid and hydroxypropyl methyl cellulose ether according to the mass ratio of 1: (0.2 to 1): (0.1 to 0.8). Under the synergistic effect of the calcium peroxide, the binder, the bentonite, the calcined oyster shell powder and the iron-loaded modified red soil, the filter material can be used as a phosphorus removal filter material, can be directly used as a filter material of a filter tank, a wetland and the like independently or in combination with quartz sand, gravel and other filter bed filter materials, can permanently remove phosphorus in surface water, can also be directly put into rivers, lakes and ponds, and can be used as a filter material of a filter tank, a wetland and the like. In addition, the preparation cost is low, and wide application prospects are achieved.

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 discloses a preparation method, a use method and application of a composite soil conditioner, and relates to the technical field of soil remediation. Compared with the prior art, the composite soil conditioner is prepared by uniformly mixing calcined oyster shells and limestone with biochar, organic activated carbon and mineral source humic acid; the composite soil conditioner is simply applied to arsenic-polluted soil, and can improve the soil structure, improve the composition of organic matters in the soil, increase the Eh value of crop rhizosphere soil and increase the biomass of crops, so that the soil quality is improved. The biological availability and toxicity of arsenic are remarkably reduced through multiple effects of soil in-situ passivation, iron-arsenic precipitation forming, iron film / titanium film forming and the like, the content of arsenic absorbed and accumulated at edible parts of stems and leaves of crops is reduced, arsenic is intercepted at unedible root parts, solid waste resource utilization is achieved, and the method is low in cost and environmentally friendly.

The invention discloses a method for promoting phytoremediation of heavy metal contaminated soil by combining modified charcoal with microorganisms, and relates to the technical field of heavy metal contaminated soil remediation. The repairing agent is prepared and comprises an inner layer, a middle layer and an outer layer, envelopes are arranged among the layers, the outer layer is further coated with an outer envelope, the inner layer comprises modified biochar and a first microbial agent, the middle layer comprises modified biochar and a second microbial agent, and the outer layer comprises dolomite powder and oyster shell powder. According to the invention, the remediation agent is combined with the heavy metal enrichment plants to carry out synergistic remediation on the contaminated soil, so that the enrichment plants can grow well under the high-acid high-concentration heavy metal environment condition, the problem of low biomass of the enrichment plants is solved, and finally, the efficient remediation of the contaminated soil is realized.

The invention relates to the field of soil pollution treatment, and discloses a preparation method and application of a composite soil conditioner capable of improving the carbon sequestration effect, and the preparation method of the soil conditioner comprises the following steps: step A, preparing biochar; step B, preparing biochar microalgae particles; step C, preparation of oyster shell powder; d, coating particles to obtain an inner-layer soil conditioner and an outer-layer soil conditioner; the soil conditioner comprises an inner layer and an outer layer which are formed by adhesion of auxiliary materials, the inner layer comprises microalgae particles enriched and recycled by charcoal and can improve acid soil for a long time and provide organic matter and nitrogen and phosphorus nutrition, and the outer layer comprises roasted oyster shell powder and is rapid in soil acidity adjustment and capable of providing calcium salt. The composite soil conditioner has a synergistic effect of various materials, can be rapidly and slowly combined, can effectively improve acid soil, passivate soil heavy metals, provide organic matters, calcium, nitrogen, phosphorus and other nutritive salts for a relatively long time, improve the nutritional quality of vegetables and improve the carbon sequestration effect of soil, and has relatively good comprehensive benefits.

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 belongs to the technical field of degradable materials, and particularly relates to an HDPE (high-density polyethylene) resin composition for a degradable packaging bottle and a preparation method of the HDPE resin composition. The degradable HDPE resin composition for the packaging bottle, provided by the invention, is prepared from 40 to 50 parts of modified HDPE, 20 to 30 parts of modified starch, 10 to 15 parts of a degradation aid, 5 to 8 parts of an antioxidant, 8 to 12 parts of nano silicon dioxide and 5 to 8 parts of oleamide. According to the invention, naringin and N-(2-aminoethyl)-3-aminopropyl methyl diethoxy silane are adopted to carry out composite modification on corn starch, so that the tensile strength and elongation at break of a starch film are effectively improved, and the modified starch is blended with glycerol, so that the technical problem of poor water resistance of starch-based biodegradable resin is effectively solved; high-temperature calcined oyster shell powder and a silane coupling agent are adopted to modify high-density polyethylene, so that the mechanical property of the high-density polyethylene material is effectively improved, meanwhile, microbial channels are provided for degradation of the high-density polyethylene material, and the degradation rate is increased.

The invention discloses a compound cadmium-reducing conditioner based on radix puerariae residue and wormcast and an application method. The cadmium-reducing conditioner comprises the following components in parts by mass: 35-40 parts of oyster shell powder, 30-45 parts of radix puerariae residue and wormcast, 3-5 parts of zinc fulvic acid, 8-10 parts of sodium sulfide and 3-5 parts of manganese sulfate. The cadmium-reducing conditioner is applied to soil before plowing of rice, plowing is performed after standing, and then the rice is transplanted; the earthworm cast is used for activating organic matter components in the radix puerariae residues, the earthworms are used for removing cadmium in the radix puerariae residues, active components in the radix puerariae residues and the earthworm cast and active components such as amino acid in the oyster shell powder act together with zinc fulvic acid, manganese fertilizer and sodium sulfide, and the oyster shell powder and the radix puerariae residues and the earthworm cast are adsorbed and degraded, so that the cadmium-rich organic fertilizer is obtained. The content of cadmium in the brown rice can be synergistically reduced to about 0.1 mg / kg; the operation is simple, and the raw materials are solid wastes and are easily available.

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 easily degradable modified agricultural mulching film and a preparation method thereof, and relates to the field of high polymer materials. When the easily degradable modified agricultural mulching film is prepared, oyster shell powder sequentially reacts with 3-bromopropyltrimethoxysilane, 4-methylpyridine, 5-(7-bromobenzo [C] [1, 2, 5] thiadiazole-4-yl) thiophene-2-formaldehyde and 4-(diphenylamine) phenylboronic acid pinacol ester, and functionalized oyster shell powder is prepared; and reacting urea with formaldehyde, reacting with monopotassium phosphate and chitosan, mixing with the functionalized oyster shell powder, performing injection molding, and drying to obtain the easily degradable modified agricultural mulching film. The easily-degradable modified agricultural mulching film prepared by the invention has good mechanical properties and capabilities of resisting bacteria, performing photocatalytic degradation, adjusting the pH value of soil and degrading the soil into fertilizers.

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 present invention relates to an acidic soil conditioner and a preparation method and application thereof. The acidic soil conditioner includes a carbon-based acid conditioner, a mineral source conditioner and a microbial preparation. The preparation method of the acidic soil conditioner includes: calcining and grinding oyster shells to obtain oyster shell powder; mixing oyster shell powder, modified biochar and quicklime to obtain a carbon-based acid conditioner; crushing and sieving at least one of attapulgite, montmorillonite and dolomite to obtain a mineral source conditioner; mixing Bacillus subtilis, Bacillus licheniformis and Trichoderma harzianum in proportion to obtain a microbial preparation; the preparation of the acidic soil conditioner: uniformly mixing the prepared carbon-based acid conditioner, mineral source conditioner and microbial preparation, and then coating to obtain a coated acidic soil conditioner. The present invention also provides an application of an acidic soil conditioner for conditioning, improving and repairing degraded acidic soil. The present invention solves the problems of soil acidification and nutrient deficiency at the same time.

The invention discloses oyster shell powder processing and crushing equipment and a crushing method thereof. The crushing equipment comprises a machine shell, a crushing device and a crushing device, wherein the machine shell is provided with a crushing cavity; the crushing mechanism comprises a group of crushing rollers rotationally mounted in the crushing cavity, the outer side walls of the group of crushing rollers are fixedly connected with crushing convex blocks respectively, and the crushing convex blocks on different crushing rollers are arranged in a staggered manner respectively; the crushed material reinforcing mechanism comprises a fixed supporting piece, the fixed supporting piece is inwards and fixedly connected with an arc-shaped limiting plate, and the arc-shaped limiting plate is fixedly connected with a corresponding ultrasonic transducer; the material crushing protruding blocks are arranged in a hollow mode and fixedly provided with corresponding abutting pieces, and the inner ends of the abutting pieces make contact with the arc-shaped limiting plates when rotating to pass through the arc-shaped limiting plates. According to the oyster shell crushing device, vibration energy can be effectively applied to the crushing convex blocks which rotationally pass through the opposite sides of the group of crushing rollers, so that the crushing effect and the crushing efficiency of oyster shell materials are effectively improved.

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 belongs to the technical field of production methods of oyster shells, and particularly relates to a production method for organizing inorganic calcium in oyster shells, which comprises the following steps: firstly, pretreating the oyster shells; then, carrying out two-step enzymolysis treatment on the pretreated oyster shell powder through an enzyme-assisted acidolysis method, and adding diluted hydrochloric acid for acidolysis to obtain an oyster shell acidolysis solution; adding protein as a substrate for combining calcium ions to generate a protein-calcium compound; and finally, preparing the piglet feed. According to the invention, inorganic calcium in the oyster shells is converted into organic calcium which is more easily absorbed and utilized by organisms, so that not only is the effective utilization of oyster shell resources realized, but also the bioavailability of calcium is improved.

The invention discloses a high-strength and high-conductivity cement-based composite material and a preparation method thereof. The cement-based composite material is characterized by being prepared from the following raw materials in parts by weight: 300 to 550 parts of calcium aluminate cement powder, 600 to 1600 parts of silica sand, 45 to 160 parts of oyster shell particles, 45 to 160 parts of iron-based amorphous alloy powder, 5 to 15 parts of conductive basalt fiber and 120 to 80 parts of water. Wherein the combined action of the oyster shell particles and the iron-based amorphous alloy inhibits the alkali efflorescence phenomenon of the cement-based composite material, and the synergistic action of the iron-based amorphous alloy and the conductive basalt fiber greatly improves the electrical and thermal conductivity of the cement-based composite material; the silica sand, the oyster shell particles and the iron-based amorphous alloy particles are used as the continuous grading fine aggregate to synergistically improve the compactness and compressive strength of the cement-based composite material, and the prepared cement-based composite material is good in thermal conductivity and electrical conductivity, high in strength and free of the alkali efflorescence phenomenon.

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.