67results about How to "Good sand fixing effect" patented technology

The invention discloses a clay-based compound sand consolidating material and belongs to the technical field of sand prevention and consolidation. The clay-based compound sand consolidating material is made of clay, sodium silicate, lewis acid, organic polymer and the like according to a certain ratio. The material is added with water to form solution at certain concentration by adding water, andthe solution is sprayed onto the surface of sand and naturally dries in an open environment to form a consolidated skin; or the clay and sand are uniformly mixed according to a certain ratio and pilled in grids, then solution prepared from the sodium silicate, lewis acid, organic polymer and water is sprayed onto the surface of the grids and naturally dries in an open environment to form consolidated skin, and thus, sand preventing and consolidating clay grids are formed. The consolidated skin of the sand consolidating material disclosed by the invention has high pressure strength, high waterpermeability, high weather resistance, and good sand consolidating effect; and the raw materials are readily available, the sand consolidation process is simple, the cost is low and the clay-based compound sand consolidating material is suitable to be promoted in a large area in desert regions.

An eco-friendly sand stabilization dust depressor is dark-brown milky liquid prepared by biomass materials, surfactants, water-soluble polymers, moisturizers, preservatives and water through mixing. The viscosity of the dust depressor is 50-80 centipoise at the normal temperature. The biomass materials are solid cake-like residues of plant seeds after a squeezing and oil pressing process or solvent digestion; the water-soluble polymers are carboxymethylcellulose and polyvinyl alcohol; and the moisturizers are magnesium chloride, calcium chloride, sodium sulfate, sodium silicate and the like. The obtained sand stabilization dust depressor is eco-friendly; and the preparation process is simple, short in process and easy to operate. The eco-friendly sand stabilization dust depressor has the advantages of being environment-friendly, non-toxic and free of pollution; and capable of effectively controlling soil wind erosion and land desertification, reducing dust weather, playing roles in sand stabilization, dust proofing and depression, and being widely used in severe wind erosive areas such as suburban farmlands, wastelands, degraded grasslands and deserts.

The present invention relates to an open-pit mine excavation process, in particular, it relates to an open-pit mining process capable of quickly discharging earth to protect bank and making ecological restoration. It is characterized by that in one end of open-pit mine or its middle said invention adopts a conventional method, if the stripping and mining operation of initial stripping working face is completed, on the deposit mining direction the mining working face can be divided into left side zone, medium zone and right side zone, then they are further divided into several smaller subsections, every subsection can be used as an unit, on every subsection the processes of stripping, mining, backfilling and banking, cultivating-greening or covering with concrete are progressively adopted so as to implement the invented open-pit mining process.

The invention relates to the field of sandstorm prevention and control, in particular to a gridding sand stabilizing device. The gridding sand stabilizing device comprises sand stabilizing units connected in sequence; each sand stabilizing unit includes a sand stabilizing plate, a connecting device and a fixed pile; bolt holes are formed in the geometric center positions of the connecting devices; four sand stabilizing plate slots communicated up and down are uniformly distributed in the outer side walls of the connecting devices; the end parts of the sand stabilizing plates are fixedly connected with the sand stabilizing plate slots in an insertion manner; the fixed piles and the bolt holes are connected in an insertion manner below the ground by 15-20 cm; and the other end parts of the sand stabilizing plates are fixedly connected with the sand stabilizing plate slots of the connecting devices of the adjacent sand stabilizing units in an insertion manner. The gridding sand stabilizing device is excellent in sand stabilizing effect, and can be applied to the sand damage treatment of highways and railways in the desert regions. The gridding sand stabilizing device is simple in structure, and is more convenient and quicker in assembly and pavement; and the connecting devices and the sand stabilizing plates cannot move to generate the falling phenomenon due to gale invasion, so that the sand stabilizing effect is guaranteed. The sand stabilizing plates and the connecting devices can be manufactured by concrete materials or sand stabilizing materials, so that the cost is saved, the service life is long, and the recycling is achieved.

The invention is a quicksand slope depth-type sand fixing method, comprising the steps of: adopting the flower pipe-micro root pile depth-type sand fixing method to carry out quicksand slope depth-type sand fixing design, i.e. drilling vertically the ground to the sand slope depth on a sand slope necessary to fix sand, inserting micro flow pipe into the hole and injecting high pressure clay, soil powder / cement and fine sand pulp into the flower pipe, so that the pulp is ejected through pores around the flower pipe to form rootlike pulp veins, which tightly hold the sand by their bonding and absorbing actions, so as to achieve the sand fixing purpose. And it can effectively fix the quicksand slope.

The invention relates to the technical field of oil field oil production engineering, and particularly belongs to an alkali-resistant film-coating propping agent suitable for ASP compound flooding. The propping agent mainly solves the problems that an existing coating film propping agent is not resistant to alkali, the propping agent is transferred in the ASP compound flooding process, accordinglyfracturing cracks are closed, and fracturing measures fail. The propping agent comprises, by weight, 90-93% of quartz sand, 2.5-5% of alkali-resistant resin, 1.3-3.6% of a curing agent, 0.07% of a silane coupling agent, 1.5% of a diluent and 0.5% of a lubricant. The alkali resistance of the film-coating propping agent is improved, so that the film-coating propping agent still has relatively highcompressive strength under a strong alkali system of ASP compound flooding, and requirements of the ASP compound flooding oil-water well fracturing measures are met.

The invention provides a biological environment-friendly adhesion agent which is mainly prepared from Suaeda glauca Bge seedcake, matched with a surfactant, a thickener and an adhesive. The adhesion agent is applicable to the adhesion of soil sand grains to form a consolidation layer to prevent storms and dust. In addition, the adhesion agent is also can be used for adhering cartons, paper, plywood and the like. The invention also provides a preparation method of the adhesion agent. The sources of Suaeda glauca Bge seedcake which is the raw material of the adhesion agent are wide and the prepared adhesion agent is nontoxic, harmless, green and environment-friendly and has significant economic and social benefits.

The present invention relates to a kind of chemical sand fixing material and its preparation process. The chemical sand fixing material consists of starch adhesive 0.5-10 wt%, inorganic adhesive 0.1-5 wt%, active stuffing 0-2 wt%, chemical fertilizer 0-0.5 wt%, assistant 0.01-1 wt% and water 89-99 wt%. The starch adhesive may be raw starch adhesive, denatured starch adhesive, high molecular grafted starch adhesive or their arbitrary mixture; the inorganic adhesive is sodium silicate and / or potassium silicate; and the assistant is preservative, wetting dispersant or defoaming agent. The present invention has good sand fixing effect, can provide plant with micro growth environment, and has the features of low cost and environment friendship.

The invention discloses a clay-based thermal phase transition multifunctional sand fixing material, and belongs to the technical field of sand preventing and sand fixing. The material is prepared by a method which comprises the following steps: crushing biomass waste into crushed slag; mixing a biomass degradable raw material and the biomass waste slag in a certain proportion at a high speed; then, performing vacuum immersion treatment to obtain a thermal phase transition energy storage additive; finally, uniformly mixing the thermal phase transition energy storage additive and clay in a certain proportion, paving and spreading the mixture on the surface of a moving dune, and spraying water on the mixture to enable the water to penetrate into the surface and crusts. A heat energy storage phase transition material and a water retaining material which are relatively low in cost are introduced by adding a chemical sand fixing idea on the basis of a clay-based sand fixing material; the prepared energy storage thermal phase transition multifunctional clay-based sand fixing material has the advantages of physical sand fixing, chemical sand fixing and plant sand fixing; the sand fixing effect is good; the cost is low; meanwhile, the problems in pure physical sand fixing and chemical sand fixing are solved, and the difficult points of the plant sand fixing is also solved, so that the clay sand fixing can be popularized and applied more comprehensively.

The invention provides a cation fenugreek-humic acid sand curing agent which is prepared by coating humic acid by hydrophobic association cation fenugreek, specifically, by taking cation fenugreek anda hydrophobing agent as reaction monomers, dissolving into a solvent, carrying out a grafting reaction under the action of an alkali catalyst, synthesizing a hydrophobing association cation fenugreeksolution, putting a humate solution into the hydrophobing association cation fenugreek, carrying out a reaction so as to obtain a coating, drying, and crushing, thereby obtaining the sand curing agent, wherein the hydrophobing agent is a long-chain organic matter which can be reacted with hydroxyl under an alkali condition. Due to an electrostatic function of cation of the sand curing agent and anion on the surfaces of sand grains, the purpose of fixing sand is achieved; the cation fenugreek has certain hydrophilicity and water retention properties, in addition, the humic acid self is rich inhydrophilic functional groups, and thus the sand curing agent has a water retention property; in addition, the humic acid self can be used as a soil conditioning agent, is capable of improving fertility of soil and thus is applicable to sand curing application.

The invention provides a chemical sand fixing agent which is prepared from the following components in percentage by mass: 40-60% of water glass of which the modulus is 2.8-3.3, 0.08-0.12% of sorbitol, 1.2-1.8% of lithium carbonate, 0.1% of polyacrylamide and 0.2% of sodium carboxymethyl cellulose. The preparation method comprises the following steps: carrying out chemical modification on the water glass, and reasonably compounding the water glass with organic high-molecular materials. Compared with the traditional water glass sand fixing agent, the chemical sand fixing agent provided by the invention has the characteristics of favorable sand fixing effect, no environment pollution, high ageing resistance and the like, and is easy to prepare and convenient for construction. The sand mold sample test result indicates that the sand fixing agent has favorable ageing resistance, freeze thawing resistance and wind erosion resistance, and the unconfined compressive strength is greater than or equal to 0.2 megapascal. The invention has a popularization value in the field of control of desertification.

The invention discloses a method for utilizing solar energy for fixing sand. The method utilizes a convex lens for focusing solar radiation and generates high temperature at a focus point for meltingsand particles for producing block-shaped sand bricks. The large-area coverage of the block-shaped sand bricks on a sand dune can thoroughly prevent desert from flowing and prevent dust storm. The method comprises the following steps: producing a special tool and utilizing optical materials for producing the convex lens with a support which can adjust direction. The convex lens is arranged on thesupport, and the direction of the support is adjusted, thereby melting the sand particles at the focus point of the convex lens for forming the big sand bricks. The large-area coverage of the sand bricks on the surface of the sand dune can achieve the purpose of fixing the sand.

The invention discloses a method for transforming desert through planting crops. The method for transforming the desert through planting crops includes steps that S10, seeding crop seeds on the desert according to suitable spacing; S20, using the mixture of animal excrement and crushed waste plant material to cover the desert seeded with the crop seeds. According to the method for transforming the desert through planting crops, through using the mixture of animal excrement and crushed waste plant material to cover the desert to transform the desert, the desert can become into a fertile farmland, and moreover, through planting crops on the desert, the sand can be effectively fixed, and desert dust is avoided. The method for transforming the desert through planting crops is capable of effectively using the crushed waste plant material especially plant straw, the plant straw incineration treatment amount is reduced, and therefore, the environment pollution due to straw incineration is reduced. The method for transforming the desert through planting crops has high environmental benefit and economical benefit.

The invention relates to the technical field of soil remediation environment engineering, in particular to a degradable self-repairing water-retaining sand-fixing agent and a preparation method thereof. The self-repairing water-retaining sand-fixing agent comprises the following components in parts by weight: 20-30 parts of hydrogel, 5-10 parts of a microcapsule and 3-5 parts of inorganic powder,wherein the hydrogel is xanthan gum / acrylic acid / acrylamide ternary hydrogel; a core material of the microcapsule is waterborne polyurethane powder, and a wall material of the microcapsule is gelatinized starch. The preparation method comprises the following steps: dissolving and preparing the hydrogel; mixing the waterborne polyurethane powder with the gelatinized starch liquid and spray-drying to obtain the microcapsule; and mixing the hydrogel, the microcapsule and the inorganic powder to obtain the sand-fixing agent. The invention solves the problem that a chemical sand fixing agent itselfis difficult to degrade and causes pollution to desert areas in the prior art, and the degradable self-repairing water-retaining sand-fixing agent provided by the invention has the advantages of being degradable, repairable, good in sand-fixing effect and wide in application range.

The invention provides a self-associating cationic polymer coated humic acid sand-fixing sustained-release agent and a preparation method thereof. The self-associating cationic polymer coated humic acid sand-fixing sustained-release agent is obtained by coating humic acid with a cationic polyacrylamide having a three-dimensional network structure, and the preparation method specifically comprisesthe following steps: taking acrylamide, methacryloyloxyethyl trimethyl ammonium chloride and butyl acrylate as monomers, adding a crosslinking agent and an initiator, and obtaining three-dimensional network-like cationic polyacrylamide with a micellar polymerization method; adding a humate solution into the cationic polyacrylamide to obtain a coated substance, and drying and pulverizing to obtainthe sand-fixing sustained-release agent. According to the invention, cations contained in the sand-fixing sustained-release agent form an electrostatic interaction with anions on the surface of sand,thereby achieving the purpose of sand fixation; cationic polyacrylamide self is of a three-dimensional network structure, and has hydrophilicity and water retention properties; humic acid has a hydrophilic functional group, and also has a water retention effect; and humic acid further has the capability of increasing soil nutrients and improving soil.

The invention provides a low-cost environment-friendly sand fixing agent and a preparation method thereof. The sand fixing agent adopts residual gum waste liquid of bast fiber microbial degumming. Thepreparation method comprises the following steps: microbial degumming of bast fiber, auxiliary treatment after microbial degumming, concentration and filling of residual gum waste, inoculation of anaerobic bacteria into concentrated residual gum waste liquid, mixing of residual gum or residual gum concentrated liquid, dilution and atomization spraying. The sand fixing agent product is developed by utilizing the characteristics that polysaccharide substances in the bast fiber residual gum absorb water, retain water, have strong adhesive force to sand grains, are easy to obtain and environmentally friendly, not only has the characteristics of good sand fixing effect, low cost and no pollution, but also can improve the physical and chemical properties of flowing sand soil. On the premise that no chemical reagent is used, the hardness of the sand bonded crust layer can reach 1.8-2.7 Kg / cm<2> after the scheme is implemented, the water retention rate of sand land is increased by 15 times, and the sand lifting air speed exceeds 20 m / s; the contents of organic carbon and total nitrogen in the sand soil are respectively increased by 580% and 470% or above, and the vegetation coverage reaches 28-33% one year after the sand fixing agent is sprayed.

The invention discloses a freeze resistant sand fixing agent, and belongs to the technical field of sand fixing. A prepared water absorbing additive can improve the swelling performance and swelling dynamics of a composite material; absorbed water is stored in the channels, introduced carboxyl groups have a hydrophilic property, water contacting performance is enhanced, the water absorbing and water retaining performance of the sand fixing agent are improved; a microbial additive absorbs Ca<2+> from a surrounding sandy environment, then Ca<2+> combines with carbonate ions to generate mineral precipitates, as the stacking of the minerals, the density of the sandy layer is increased, the permeability is reduced, the absorbed water is sealed and stored, the cementing of sand is promoted, thesand is continuously fixed and protected; a freeze resistant additive can effectively reduce the size of pores, the transpiration rate is reduced, the water utilization rate is increased, water loss is reduced, water can be absorbed and utilized by plants, and the sand quality can be adjusted. The problems that in the prior art, the freeze resistant performance of a conventional sand fixing agentis bad and the sand fixing efficiency is bad are solved.

The invention provides a sand-fixation agent of humic acid wrapped with a degradable natural macromolecular compound, and a preparation method thereof. The sand-fixation agent is obtained in a mode ofcoating the humic acid with hydrophobic association cationic starch, specifically, cationic starch and a water repellent agent are used as reactive monomers, dissolved in a solvent and conduct a grafting reaction under the action of a basic catalyst to synthesize the hydrophobic association cationic starch, a humic acid salt solution is added into the hydrophobic association cationic starch to obtain coated matter, the coated matter is dried and smashed, and the sand-fixation agent is obtained, wherein the water repellent agent is long-chain organic matter capable of reacting with hydroxyl groups under the basic condition. Cations of the sand-fixation agent and anions of the surfaces of sand grains have electrostatic interaction so that the purpose of sand fixation can be achieved; the cationic starch has the hydrophilic property and the water retention property, and the humic acid also has some hydrophilic functional groups, so that the sand-fixation has the water retention effect; besides, the humic acid further has the capability of improving soil.

The invention relates to an iron tailing pond greening afforestation method. In the method, field soil, turf, decomposed chicken manure, three-nutrient composite fertilizer, water-retaining agent and rooting agent are mixed according to a certain proportion and then filled into a nursery pot; then mulberry seedlings and sea-buckthorn seedlings are transplanted to the nursery pot and cultured for two to three months; then the nursery pot is transplanted into a pit formed in a dam body surface; two lines of mulberry seedlings and four lines of sea-buckthorn seedlings are crossed-planted; alfalfa is planted between pits; water and seeds are regularly supplied; fertilizers are dressed in spring and summer; and the mulberry seedlings and the sea-buckthorn seedlings are trimmed in the next spring and afforestation can be finished. By the use of the method, soil use amount can be greatly reduced and high survival rate of mulberry trees and sea-buckthorn trees can be achieved; and the roots extend into the tailing sand, so great sand solidification effect can be achieved.

The invention relates to a method for achieving sand stabilization of a high-cold region through carex brunnescens. The method comprises the steps that in a first stage, first carex brunnescens living sand barrier queues are planted with the spacing of 10-20 m in the lower middle portions of the two sides of a moving longitudinal dune in the direction perpendicular to prevailing wind; in a second stage, after the longitudinal dune is leveled off through wind erosion, second carex brunnescens living sand barrier queues are planted on a large scale with the spacing of 0.5-1.0 m on a wind erosion flat ground located in the middle, living sand barriers at the left and right sides are integrally connected through the second carex brunnescens living sand barrier queues, and then stable sand stabilization surfaces can be formed. According to the method, a technique of utilizing carex brunnescens for sand stabilization is provided for achieving ecological management and sand stabilization practice of desertified grassland in the high-cold region, the cost for sand prevention and control is reduced, the sand stabilization period is shortened, the sand control effect is improved, a solid foundation is laid for better utilizing resource plants carex brunnescens in the future, and a new research prospect is opened up for ecological restoration of the desertified grassland in the high-cold region.

The invention belongs to the technical field of plant asexual propagation, and discloses a tissue culture propagation method of an endangered rare plant tetraena mongolica. Tissue culture is intensively embodied in collection and pretreatment of an explant of the tetraaceae mongolian and the completion part of each treatment stage of the tetraaceae mongolian. A tissue culture technology is applied, and annual tetraena mongolica plants are directly induced to root for propagation. The annual new branches are taken as explants, and washing with running water is conducted to remove attachments such as dust and the like on the surfaces of the explants; and a cleaning agent is adopted to disinfect and sterilize the surface of the explants. The sterilizing agent is used for disinfecting and sterilizing the explants, the sterile environment of the treated explants is guaranteed through secondary flushing of sterile water, and the sterilizing agent is matched with the optimal culture medium to complete tissue culture of the tetraena mongolica. According to the culture mode, the technical bottleneck of artificial breeding and cultivation of the tetraena mongolica is broken through, and artificial rapid breeding and large-scale production and application of endangered desert plants are achieved. A large number of tetraena mongolica plants are obtained through a tissue culture asexual propagation means, artificial propagation of tetraena mongolica is achieved, and basic conditions are provided for continuation and expansion of populations.

The invention belongs to the field of environmental treatment and provides a carbon-based sandy soil modifying agent and application thereof. The carbon-based sandy soil modifying agent is prepared from charcoal and solution containing a sand fixing agent by mixing and drying, wherein a mass ratio of the charcoal to the sand fixing agent is 75:0.5-2.5, and the sand fixing agent comprises at leastone of polyvinyl alcohol and sodium carboxymethyl cellulose. The carbon-based sandy soil modifying agent contains the charcoal and the sand fixing agent, and the charcoal intrinsically contains a great quantity of organic carbons and a certain quantity of minerals and is capable of improving sand nutrition and improving water absorptivity of sand; due to characteristics of high porosity and largesurface area of the charcoal, a protective effect on the sand fixing agent can be achieved, and denaturation of the sand fixing agent in a natural environment is prevented. The carbon-based sandy soilmodifying agent is excellent in sand fixing effect, great in water retentivity and applicable to desertification control and has a promising application prospect.

Embodiments of the invention provide a sand fixing agent capable of preventing exposed soil from dust-raising and preventing sand from drifting, and a preparation method and an application thereof. The sand fixing agent comprises the following components in parts by mass: 0.01 to 15 parts of macromolecular polymers, 0.01 to 15 parts of alkalis, 0.01 to 15 parts of esters and a proper amount of water. The preparation method comprises the following steps: uniformly mixing the macromolecular polymers, the esters, the alkalis and the water under stirring so as to form the sand fixing agent. The sand fixing agent provided by the embodiments of the invention can be applied to the aspects of preventing exposed soil from dust-raising and preventing sand from drifting, and is specifically applicable to desert control. Through preparation into an aqueous solution by combining the macromolecular polymers, the esters and the alkalis in a certain proportion, and application to the surface of soil,the sand fixing agent bonds soil particles into a large aggregate structure, and can realize a relatively-stable surface layer insusceptible to wind erosion and water erosion when the content reachesa certain number, thereby reaching the effect of fixing sand and obtaining a pioneering significance.

The invention discloses a fish scale type sand stabilization mulching film and a using method thereof. The fish scale type sand stabilization mulching film comprises a mulching film body, wherein a plurality of pockets are arranged on the mulching film body, and the pockets are arranged in a fish scale mode. The using method of the fish scale type sand stabilization mulching film comprises the steps that the fish scale type sand stabilization mulching film is laid on a desert, evaporation of water can be prevented, and the mulching film plays a role in water retention; local materials are utilized, sand is fed into the pockets arranged on the mulching film body in the fish scale mode to press the mulching film and to prevent the mulching film from being blown away by air, and the effects of wind prevention and sand fixation are achieved. Trickle irrigation facilities can be laid under the mulching film, and holes are formed in the mulching film to be used for planting plants. The fish scale type sand stabilization mulching film is simple in structure, low in laying cost, good in water retention and sand stabilization effects, and beneficial to desert greening.

The invention relates to a preparation method for a greening brick from casting wastes and the obtained greening brick. The greening brick is prepared from the following raw materials in parts by weight: 10-20 parts of waste residues, 20-40 parts of waste sand, 10-30 parts of waste dust, 20-30 parts of water glass, 5-10 parts of cement, 3-5 parts of a plasticizer, 3-10 parts of a binder, 2-5 partsof a water reducer and 10-30 parts of water. The preparation method includes the processes of waste collection, material preparation and blank preparation, curing and maintenance. The casting wastesare used as main raw materials, not only are the resources saved, but also the environmental pollution caused by accumulation of the casting wastes is avoided; during the curing process, an amorphoussilicic acid gel is formed by the reaction of water glass and aluminum chloride, and the crosslinking is formed between the casting wastes, the adhesive force between the casting wastes is enhanced, and the strength of the greening brick is improved; and the prepared greening brick has good air permeability and water absorption and water retention performance.

The invention provides a preparation method of a desert alga-type attapulgite-based polymer sand stabilization material. The preparation method comprises the following steps: pretreatment and expanding propagation of desert alga crusts, pretreatment of attapulgite and preparation of attapulgite-based super absorbent resin; and preparation of the desert alga-type attapulgite-based polymer sand stabilization material, wherein the desert alga crusts are compounded with the attapulgite-based super absorbent resin to obtain the desert alga-type attapulgite-based polymer sand stabilization material.According to the preparation method, artificially cultured desert algae and the synthetic polymer material are combined to be applied to desertification control, the advantages of fast effectivenessand good sand stabilization effect of a chemical sand stabilization material are kept, and the characteristics of strong vitality, high adaptability to the environment in desert areas, capability of improving soil fertility, and the like of the wild lower plant-desert algae in the desert area are also utilized, so that a positive effect is exerted in subsequent vegetation recovery and ecological succession in the areas. Therefore, the problems of vegetation in desertification land and restoration of production capacity are solved.

The invention discloses a method for arranging a sand-barrier in a moving dune. The method includes the following steps: pits are dug in the moving dune in spring, wherein the bottom of the pits reaches a wet sand layer; tubers of Jerusalem artichoke are sowed in the pits; the tubers of the Jerusalem artichoke are covered with sand; and living sand-barriers of the Jerusalem artichoke are formed after the Jerusalem artichoke grows. Through utilization of the technical scheme of the method, the method is rapid in construction and simple and easy to operate, and the living sand-barriers can playthe role of sand fixation, can achieve the effect of replacing wheat straw square sand-barriers that are previously arranged, and have the advantages of environmental protection and conservation.

The invention relates to bacillus for soil microbial film sand stabilization, a microbial agent containing the bacillus and application of the bacillus. The microbial agent is prepared by screening strains which survive in local aeolian sandy soil and are high in exopolysaccharide yield and optional auxiliary strains and matching with proper culture media and adsorbents. After the microbial agent is applied to soil needing sand stabilization treatment, the bacillus secretes exopolysaccharides, so that bacterial colonies are continuously adhered together to form a stable microbial film, a relatively stable special space structure is formed between the microbial film and soil particles, soil agglomeration is promoted, and a remarkable sand stabilization effect can be achieved. The method can effectively improve the characteristics and moisture characteristics of the aeolian sandy soil, has a good promotion effect on the growth and development of psammophyte, has great application potential and application value in the improvement of the aeolian sandy soil, is simple to operate and low in cost, and can provide a new way for the prevention and treatment of land desertification.

The invention discloses a preparation method of a biochar and microcoleus vaginatus combined desert crusting agent. The preparation method comprises the steps: inoculating a culture medium with microcoleus vaginatus, placing the culture medium inoculated with microcoleus vaginatus into a culture box, and carrying out light culture and dark culture every day to obtain algae seeds; carbonizing ricehusks in a top combustion type carbonization furnace; carrying out high-pressure steam treatment on sand, then, uniformly mixing the treated sand and biochar according to a certain ratio to obtain sand-biochar, then, spreading the sand-biochar in a plastic plate, dissolving dried microcoleus vaginatus powder into deionized water, and uniformly spraying the solution on the surface of the sand-biochar; and placing an opening of the plastic plate in a ventilated and illuminated culture box, carrying out light culture and dark culture every day, and replenishing running water to the plastic plateevery day within first several days of culture to finally obtain the desert crusting agent. The preparation method has the beneficial effects that the formation of desert crusts under a drought condition is promoted remarkably, the sand stabilization effect is good, and the biochar and microcoleus vaginatus combined desert crusting agent is an ideal desert crusting agent.

The invention relates to the technical field of sand-fixing soil-repairing agents, in particular to a wind erosion-resistant modified polyurethane sand-fixing soil-repairing agent and a preparation method. The sand-fixing soil-repairing agent is composed of a component A comprising diatomite modified lignin nitrate and a component B comprising a linear polyurethane pre-polymer. The component A isprepared by taking water and polyethylene glycol according to the weight percentage, adding polyethylene glycol into water, performing even stirring to obtain a lignin derivative solvent, dispersing diatomite into the lignin derivative solvent, adding lignin nitrate, and performing stirring at room temperature for 1-2 h. The component B is prepared by adding an oligomer diol into diisocyanate, performing even stirring and mixing, introducing an inert gas, and adding a hydrophilic chain extender and a non-hydrophilic chain extender for carrying out a reaction. When the sand-fixing soil-repairing agent is used, the two components A and B are thoroughly mixed and sprayed onto a flowing sand surface to carry out a reaction, and thus a polyurethane material for sand-fixing and repairing with high strength and high toughness is formed.