221 results about "SODIUM SILICATE SOLN" patented technology

The invention discloses a preparation process of a fireproof lightweight thermal-insulation cement-based mortar material, which comprises the following steps: (1) placing porous lightweight aggregate in a sodium silicate solution for standing, and drying the obtained aggregate to obtain pretreated thermal-insulation aggregate; (2) uniformly mixing silica fume, calcium silicate powder, calcium hydroxide powder and water to form slurry; mixing the pretreated thermal insulation aggregate with the slurry, separating, airing the aggregate, and curing to obtain the primary thermal insulation aggregate. And (3) spraying water on the primary thermal insulation aggregate for wetting, then spraying ethanol containing a silane coupling agent, and airing to obtain the modified thermal insulation aggregate. And (4) uniformly mixing Portland cement, the modified thermal insulation aggregate, basalt fiber and a water reducing agent as raw materials, adding water, and uniformly stirring to obtain the mortar material. According to the invention, the water absorption rate of the porous lightweight aggregate is reduced, so that the adverse effect of the high water absorption characteristic of the aggregate on the mechanical properties of the mortar material is effectively reduced.

The invention discloses surface hydroxylation modified mesoporous SiO2, a preparation method of the surface hydroxylation modified mesoporous SiO2 and a SiO2-based solid amine adsorbent. The preparation method comprises the following steps: dispersing waste glass powder into a first alkali solution, and reacting under a heating condition to obtain a sodium silicate solution; the concentration of the first alkali solution is 20-30 g / L; introducing carbon dioxide into the sodium silicate solution to obtain mesoporous SiO2; dispersing the mesoporous SiO2 into a second alkali solution, and carrying out heating treatment, so as to obtain surface hydroxylation modified mesoporous SiO2; and the concentration of the second alkali solution is 0.2-3 g / L. The glass powder is subjected to silicon extraction in an alkali dissolution mode to obtain the Na2SiO3 solution, the silicon recovery rate of 92% can be achieved, the prepared surface hydroxylation modified mesoporous SiO2 can be used as a carrier, PEI is loaded through a physical dipping method, the SiO2-based solid amine CO2 adsorbent is prepared, and on the basis of maintaining the high CO2 adsorption capacity, the CO2 adsorption capacity is greatly improved. The long-term stability of the solid amine adsorbent in an O2-containing environment can be maintained, and the service life and the long-term cyclic adsorption performance of the solid amine adsorbent are greatly improved.

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

The invention discloses a method for preparing precipitated silicon dioxide for a heavy truck, and belongs to the technical field of silicon dioxide preparation, the method comprises the following steps: S1, selecting solid sodium silicate with modulus of 3.3-3.5, preparing a sodium silicate solution with concentration of 30-35 wt%, in the preparation process, firstly putting the solid sodium silicate into a crusher for crushing, and then putting the crushed solid sodium silicate into a stirrer for stirring; then adding the crushed solid sodium silicate into deionized water, stirring, and heating in the stirring process; the specific surface area of the target product is high and reaches 200-240 m < 2 > / g, the dispersion grade reaches 9.8 or above, meanwhile, the mechanical strength is remarkably improved, the tensile strength reaches 25 MPa or above, the 300% stress at definite elongation reaches 7.0 MPa or above, a two-step seed crystal method preparation process is adopted, the regularity of the microstructure of the product is higher, and the product has the higher surface area and higher mechanical performance.

The invention provides lightweight non-sintered ceramsite prepared from machine-made sand tailing mud as well as a preparation method and application of the lightweight non-sintered ceramsite, and relates to the field of lightweight building materials. The preparation method comprises the following steps: weighing the following raw materials in parts by weight: 50-65 parts of machine-made sand tailing mud, 35-50 parts of fly ash, 10-25 parts of cement, 16-19 parts of quick lime, 1-4 parts of ammonium carbonate and 12-18 parts of water; the method comprises the following steps: dehydrating and crushing the machine-made sand tailing mud, and stirring and mixing the materials in a round pot granulator to obtain an unfired ceramsite mixture; spraying the sodium silicate solution into a granulator at a constant speed to obtain spherical particles; and curing to obtain the light non-sintered ceramsite. The quick lime is used for pretreating the machine-made sand tailing mud, the water content of the machine-made sand tailing mud can be reduced, the machine-made sand tailing mud is successfully granulated, the strength of the ceramsite can be effectively improved, meanwhile, the ceramsite is combined with sodium silicate for alkali excitation, ammonium carbonate is used for foaming, preparation is simple, energy consumption is low, the solid waste utilization rate is high, and economic benefits are remarkable.

The invention discloses a process method for preparing aerogel by using gasified slag through a wet process, which realizes high-valued resource utilization of solid wastes, reduces production energy consumption and production cost, and reduces the influence on the environment at the same time. According to the method, the activated silicon-rich waste residues are adopted as raw materials, original crystalline phase silicon in the activated silicon-rich waste residues is converted into active amorphous silicate, the active amorphous silicate can efficiently react with alkali liquor under the low-temperature and normal-pressure conditions to generate a sodium silicate solution, dependence on a high-energy-consumption roasting process is eliminated, energy consumption is reduced by 40% or above, meanwhile, a large number of impurities and metal ions do not exist, and the method is environmentally friendly. The preparation method comprises the following steps: performing alkaline leaching on activated silicon-rich waste residues to obtain a sodium silicate solution which does not need secondary concentration, performing sol-gel reaction, aging reaction, solvent exchange reaction and hydrophobic modification treatment, and finally performing washing and drying to synthesize the hydrophobic silicon dioxide aerogel with high additional value. And the silica aerogel with different densities and specific surface areas is prepared by adjusting parameters such as aging time, aging temperature, modifier concentration and the like.

The invention relates to the technical field of sodium silicate production, and particularly discloses a method for preparing sodium silicate by dissolving fluorine-containing silicon dioxide with alkali lye, which comprises the following steps: step 1, adding fluorine-containing silicon dioxide, sodium carbonate and water into a reaction kettle with a stirrer and a heating device to obtain a mixed material; 2, fully and uniformly stirring the mixed material obtained in the step 1, heating the mixed material by using a reaction kettle, and controlling the reaction temperature and the reaction time for reaction; and 3, filtering and separating the reaction product obtained in the step 2 to obtain a sodium fluoride filter cake and a sodium silicate solution. Sodium carbonate and sodium bicarbonate are used for dissolving silicon dioxide in a liquid phase reaction to prepare sodium silicate, the process is green and environment-friendly, sodium carbonate in chemical production can be effectively utilized, energy is saved, consumption is reduced, and the environment is protected. The technical problems that in the prior art, the temperature is high in the reaction process, a large amount of heat needs to be consumed, and energy consumption is high are solved.

The invention discloses a preparation method of flame-retardant recombined bamboos. The preparation method comprises the steps that bamboo chips are put into an alkaline solution to be treated; immersing the bamboo chips into a NaIOO solution for reaction, and then putting the bamboo chips into a NaClO solution for reaction; the bamboo chips are put into a nano-cellulose, montmorillonite and sodium silicate ternary composite solution to be subjected to vacuum impregnation and normal-pressure impregnation; the bamboo chips are put into phenolic resin to be subjected to normal-pressure impregnation and vacuum impregnation, and then low-temperature drying is conducted; and the bamboo chips are laid in a mold in parallel in the grain direction, cold press forming is conducted, then hot pressing is conducted, and finally pressure reduction and cooling are conducted in stages till demolding is conducted. Nano montmorillonite is uniformly dispersed in a sodium silicate solution by using carboxylated nano cellulose, and inorganic components of montmorillonite and sodium silicate can be uniformly and firmly constructed on the surface of a bamboo chip which is pretreated by an alkaline solution and oxidized by NaIOO and NaClO solutions by abundant carboxyl groups under the action of hydrogen bonds, covalent bonds and the like, so that a compact layered network structure is formed; and the flame retardant property of the recombined bamboo is effectively improved.

The invention relates to the technical field of preparation of novel bio-based materials, in particular to a preparation method for producing a rice hull-based high-purity high-modulus sodium silicate solution by taking rice hulls as raw materials. Rural solid waste rice hulls / grass are used as raw materials, combustion is carried out at the fixed low temperature of 700-750 DEG C, generated steam is used for supplying heat to the production or the park, and the combusted rice hull ash contains amorphous silicon dioxide gt; 90%; the method comprises the following steps: activating rice hull ash just out of a chamber and diluted hydrochloric acid (5-10%) to generate polyhydroxy surface modified silicon dioxide active seeds; the method comprises the following steps: dynamically mixing rice hull ash and a 25% NaOH solution according to a molar ratio of (3.25-4): 2, adding 3-7% of active seeds in batches at 105 + / -5 DEG C, and reacting for more than or equal to 3 hours; the high-purity sodium silicate solution with the modulus of 3.25-4.0 is finally obtained through pH segmented regulation (Mg < 2 + > is removed at the pH of gt and 12, and Ca < 2 + > is removed at the pH of 9.5-10) in combination with high-pressure refined filtration; the product is mainly used for preparing nano silicon dioxide, especially for preparing 5nm silicon dioxide dispersion liquid and high-purity electronic grade silicon dioxide as raw materials.

The present invention relates to a method for producing a composite adsorbent of ferrocyanide of a transition metal in the matrix of silica gel comprising the following steps: (i) preparing a first aqueous composition comprising at least the mixture of a sodium or potassium ferrocyanide with a sodium silicate solution so as to obtain the dissolution of salts; (ii) preparing a second composition comprising the mixture of at least: a transition metal salt chosen from one or more of the following compounds: nickel, copper, zinc, cobalt, and an inorganic acid; (iii) mixing the first aqueous composition with the second composition until a suspension is obtained; (iv) adding an inorganic acid or base so that the suspension obtained at the end of step (iii) has a pH ranging from 4 to 9;(v) demixing the suspension obtained at the end of step (iv) so as to obtain a precipitate within a liquid phase; (vi) separating said precipitate, rinsing and drying the precipitate, so as to obtain a solid precipitate, characterized in that the first aqueous composition comprises a soluble rubidium or cesium salt, and the second composition further comprises a soluble metal salt chosen from one or more of the following compounds: aluminum, titanium, zirconium.;

The invention discloses a preparation method of a nanocellulose reinforced and dispersed silicon flame retardant, which comprises the following steps: mixing calcium-based montmorillonite with deionized water to obtain a calcium-based montmorillonite suspension; taking a suspension formed by mixing carboxylated nanocellulose and deionized water as a dispersing agent, and mixing a calcium-based montmorillonite suspension and the dispersing agent to obtain a mixed solution; stirring the prepared mixed solution, then carrying out ultrasonic dispersion treatment, then carrying out centrifugal precipitation, and taking an upper-layer suspension to obtain a synergistic flame-retardant solution; mixing sodium silicate with deionized water to prepare a sodium silicate solution; and mixing the prepared synergistic flame-retardant solution with a sodium silicate solution, adding an alkali solution at the same time, carrying out an ion replacement reaction, uniformly stirring, cooling to room temperature, and carrying out sealed storage, so as to obtain the nano-cellulose reinforced and dispersed silicon-based flame retardant. The preparation method of the silicon-based flame retardant solves the technical problems of poor compatibility, low mechanical property and reduced flame retardance caused by increase of the addition amount of inorganic mineral substances in the silicon-based flame retardant in the prior art.

The invention relates to the technical field of stainless steel casting preparation, in particular to an anti-aging stainless steel material and a casting process thereof. Wherein the chemical components comprise, by weight, 0.01%-0.03% of C, 18%-22% of Cr, 8%-11% of Ni, 0.1%-0.8% of Mo, 0.5%-1.5% of Mn, 0.2%-1.0% of Si, 1.0%-3.6% of Cu, 0.2%-0.5% of Nb, 0.15%-0.25% of N and the balance Fe. The lime, the fluorite, the aluminum powder and the sodium silicate solution are precisely proportioned, a series of synergistic effects are achieved through a rigorous technological process, the physical and chemical properties of the smelting slag are optimized, and the high-alkalinity and high-fluidity smelting slag generated through the synergistic effect of the lime and the fluorite has the advantages that the smelting efficiency is improved; ideal thermodynamic and dynamic conditions are provided for desulfurization and dephosphorization reactions, harmful elements such as sulfur and phosphorus can be rapidly combined with CaO, stable compounds are generated and enter a slag phase to be removed, and the toughness and corrosion resistance of stainless steel are improved.

The invention discloses a preparation method and a preparation system of high-dispersion silicon dioxide for tires in winter, and the preparation method comprises the following steps: S1, putting solid sodium silicate into a static pressure kettle, adding steam to pressurize to 0.8-1.0 MPa, and maintaining the pressure for 2 hours to obtain concentrated water glass; s2, adding water into the concentrated water glass to prepare a sodium silicate solution with the silicon dioxide content of 20-25wt%, standing in a storage tank for more than 10 days, and filtering; and S3, adding sucrose fatty acid ester and concentrated sulfuric acid with the mass concentration of 98% into the sodium silicate solution, and reacting for later use. The special silicon dioxide for the winter tire is high in dispersity, uniform in particle and good in surface structure and can endow the winter tire with more excellent comprehensive performance, and sucrose fatty acid ester is added as a reaction regulator, so that the product has more excellent structural performance.

The application discloses a non-metallic mineral powder ball preparation method for loading plant nutrient factors, and comprises the following steps: kaolin is added into hydrochloric acid and stirred, washed with water, calcined at 400-460 DEG C for 1-2h, then added into water with gelatinized starch and stirred, added with silane coupling agent KH560 and continuously stirred, filtered, washed, dried, added with polyvinyl alcohol and pH regulator and stirred to obtain premix; fly ash and refined sugar are uniformly mixed and formed to obtain pretreated fly ash; potassium hydroxide is added into sodium silicate solution and stirred uniformly, then hydroxypropyl chitosan is added and stirred to obtain a precursor solution; the precursor solution is uniformly poured on the surface of the pretreated fly ash, and then placed, solidified, ultrasonic washed and dried to obtain a sponge-like carrier; field soil, organic fertilizer and plant fermented straw are added into a high-speed pulverizer and pulverized, and sieved to obtain granules; the premix and the sponge-like carrier are added and uniformly mixed, and then formed to obtain a seedling raising substrate.

The invention discloses a modified raw soil material based on copper tailings and a preparation method thereof, and belongs to the technical field of building materials. The performance of a traditional raw soil material is optimized by using an alkali activator solution (prepared from a sodium hydroxide solution and a sodium silicate solution), copper tailings, sodium carboxymethyl cellulose, ceramic fragments and the like, and the reasonable adding amounts of the materials are as follows: 10% of copper tailings, 2% of sodium hydroxide, 4% of sodium silicate, 4% of sodium carboxymethyl cellulose, 4% of ceramic fragments and 0.6% of straw. The mechanical property, the water resistance and the like of the modified immature soil material are obviously improved, the copper tailings can be subjected to reduction, recycling and harmless utilization, the immature soil material has better regeneration value and environmental benefits, and the prepared immature soil material can be effectively applied to the fields of immature soil building reinforcement, cultural relic and ancient building restoration, civil engineering and the like.

This invention relates to the field of casting technology for sand cores and sand shells, and particularly to a method for preparing high-precision casting sand cores and sand shell components based on a coated sand process. The method includes the following steps: rinsing quartz sand and reacting it with a sodium silicate solution to obtain coated quartz sand; adding 3-aminopropyltriethoxysilane and water to the coated quartz sand in a high-speed mixer; sequentially adding modified benzoxazine resin, calcium citrate, magnesium chloride, hyperbranched polyamide, and polycaprolactone-grafted starch to obtain finished coated sand; plasma-treated chromium-12 molybdenum-vanadium mold steel to obtain an amino-modified mold; sand-jetting the finished coated sand into left / right half-shells; shaping and pre-embedding chromite sand cores with chills to obtain left / right half-shell green blanks; milling the surfaces of the left / right half-shell green blanks, coating them with resin, butt-jointing, curing, and deburring to obtain the casting sand core and sand shell. This method solves the problems of poor mechanical strength, poor high-temperature stability, low production efficiency, and poor environmental performance in high-precision casting sand cores and sand shells.

The application discloses a method for preparing spherical large-pore volume silica gel based on secondary growth, and belongs to the technical field of inorganic non-metallic materials. First, spherical silica gel precursors are prepared through a coprecipitation method; then, 10-40% sodium silicate solution by mass fraction is added to the spherical silica gel precursors, and heating and stirring are conducted at 30-50 DEG C for 0.5-6 hours; liquid is discharged, dilute sulfuric acid by mass fraction is added to the silica gel, the pH value is controlled to be 3-7, and heating and stirring are conducted at 30-50 DEG C for 0.5-3 hours. Then, the temperature is increased to 80-95 DEG C, and heating and stirring are continuously conducted for 2-3 hours; liquid is discharged again, deionized water is added to stir and wash the silica gel, the washing water is filtered and discharged, and the silica gel is repeatedly washed with water until the conductivity of the washing water is less than 20 mu s / cm; and drying and calcination are conducted to obtain silica gel products. Through the reaction of sodium silicate and dilute sulfuric acid in the pre-prepared spherical silica gel, the silica gel skeleton formed is strengthened, the pore structure is prevented from collapsing in the drying process, and thus the large-pore volume silica gel is obtained.

The invention relates to the technical field of fiberboard modification, in particular to a fiberboard surface modification treatment method which comprises the following steps that 1, a modification solution is provided for the surface of a fiberboard, the modification solution comprises a sodium silicate solution, and the modulus of sodium silicate used for preparing the modification solution is 1.0-3.0; 2, the fiberboard is aired for 4 min to 6 min; and 3, hot pressing is conducted on the fiberboard. By applying the sodium silicate solution to the surface of the fiberboard, the surface hardness of the fiberboard can be improved, the flame retardant property of the fiberboard is improved, and the dimensional stability of the fiberboard is improved, so that the existing fiberboard can meet the performance requirements of the PCB hole arrangement processing base plate.

The application provides a fluorosilicon modified geopolymer oil-water repellent surface layer material, which comprises the following components in parts by weight: 80-115 parts of silico-aluminate mineral raw material, 15-25 parts of modified silicone-acrylic emulsion, 15-25 parts of fluorine-containing polymer, 55-70 parts of sodium silicate solution, 25-30 parts of solid caustic alkali, 10-20 parts of deionized water, 2-3 parts of organic fiber, 1.5-2 parts of grinding aid, 0.25-0.3 parts of water reducing agent and 0.1-0.2 parts of silane coupling agent. The application also provides a preparation method of the surface layer material, which comprises the preparation of an organic alkali activator, the preparation of geopolymer powder, the preparation of a fiber-alkali activator mixed solution, the preparation of fluorinated silicon dioxide, the preparation of geopolymer slurry and the curing of the geopolymer surface layer material. The surface layer material can not only effectively solve the problem of strong hydrophilicity and lipophilicity and easy water and oil intrusion, but also ensure the mechanical strength and good impact resistance of the structure, and can be applied to the fields of boat bridge pavement, surface protection of sea-crossing bridge, offshore oil platform and extreme environment building.

The application discloses an additive manufacturing method of a solid waste-based brick-mud structure composite material, which uses alkali-activated solid waste materials as bricks and thermosetting resin furan resin as mud; the alkali-activated solid waste materials comprise, in terms of weight fractions, 80-85 parts of granite powder, 27.4-30 parts of slag, 5-8 parts of silica fume, 1.5-3 parts of fly ash, 0.41-0.43 parts of basalt fiber with a length of 0.8-1.2 mm, 25-27 parts of water, 3.0-3.5 parts of sodium hydroxide and 6.0-7.0 parts of sodium silicate solution; the granite powder is prepared into the brick-mud structure composite material by using a paving type additive and a laser subtractive synergistic process according to a particle gradation weight fraction ratio of 100-120 mesh:200 mesh=1:(1-1.5). Rolling is performed after paving of the "brick" layer and the "mud" layer each time, pressure compaction in the printing process is realized, the combination of the "brick" and the "mud" is more compact, the synergistic effect of the two materials is better, the loss of the brick-mud structure compressive strength is effectively reduced, and the strength and toughness of the composite material are improved.

The application provides a sodium silicate silica gel cellulose membrane and a preparation method and application thereof, and belongs to the technical field of silica gel membranes. In the application, a sodium silicate solution with viscosity is immersed between plant fibers, part of the sodium silicate on the cellulose membrane reacts with carbon dioxide in the air to produce amorphous silicic acid gel, and the silicic acid gel is converted into silicon dioxide through natural dehydration and drying, so that the silica gel powder and the cellulose film are tightly connected together. The preparation method provided by the application is simple in operation and low in cost, can be used for production and application in ordinary laboratories with insufficient funds, the sodium silicate silica gel cellulose membrane prepared by the method has the characteristics of adsorbing nucleic acids, can replace silica gel membranes on the market to prepare relatively pure nucleic acid samples, and has a shorter operation time and a higher extraction efficiency than that of using only silicon dioxide particles, silica gel particles and calcium carbonate powder to adsorb nucleic acids in a nucleic acid extraction solution.

The application relates to a sodium silicate polymerization kinetics prediction method based on atomic dynamics Monte Carlo, and belongs to the technical field of material multi-scale simulation. The method aims at the problems that existing experimental means are difficult to track the microstructure evolution in the sodium silicate condensation process in real time, and that the full-atomic molecular dynamics calculation amount is too large, adopts an event-type atomic dynamics Monte Carlo algorithm, establishes a lattice model of a sodium silicate solution, and simulates the dynamic forming process of a Si-O-Si network by calculating the condensation reaction rate and steric hindrance effect under different moduli and temperatures. The method can output the average polymerization degree-time evolution curve, the final Q n distribution and the gel time in a time of seconds, wherein the Q 4 score can directly quantify the three-dimensional connectivity of the silicon-oxygen network. The application connects the micro polymerization reaction kinetics with meso / macroscale performance prediction, and provides an efficient cross-scale calculation tool for the curing process optimization and water resistance evaluation of a sodium silicate-based binder.

The invention belongs to the field of separation and purification, and particularly relates to a biomass reducing agent for preparing industrial silicon and a preparation method of the biomass reducing agent. Carrying out alkali treatment on the rice husk carbon precursor to prepare rice husk carbon containing sodium silicate, and separating to obtain the rice husk carbon and a sodium silicate solution; modifying the rice husk charcoal to convert residual sodium silicate into silicon dioxide, so as to obtain modified rice husk charcoal; performing hydroxylation modification on the straw carbon, then mixing with the modified rice husk carbon, putting into a sodium silicate solution, fully mixing, and forming, thereby obtaining the product. The strength of the biomass reducing agent disclosed by the invention is greatly improved, so that the biomass reducing agent can meet the production requirements of industrial silicon and can better replace charcoal, and resource utilization of agricultural and forestry wastes is realized.

The invention belongs to the technical field of road engineering construction, and particularly relates to a salinized soil salt-isolation roadbed structure and a construction method thereof.The method comprises the steps that lime is mixed into salinized soil with the salt content smaller than 3%, then a sodium silicate solution is sprayed to form a basic treatment layer, then a capillary impermeable layer is laid, and the capillary impermeable layer comprises a GCL bentonite blanket and an HDPE film; then silane coupling agent modified zeolite is laid and compacted to form an adsorption layer, compound aggregate is laid and compacted in a layered mode to form a salt fixation layer, the compound aggregate comprises graded broken stone and slag, and a plurality of inverted-V-shaped water permeable pipelines are arranged in the salt fixation layer at intervals; then, basalt fiber geogrids are laid firstly, then low-salt clay is laid and compacted in a layered mode to form a salt isolation layer, finally, cement stabilized macadam doped with silica fume is laid, a pavement base layer is formed after maintenance, and construction is completed. The salt-isolating roadbed structure integrating efficient seepage prevention, salt isolation, freeze thawing resistance and structure enhancement is constructed, and the road maintenance frequency caused by salt heaving and frost heaving can be remarkably reduced.

The application belongs to the technical field of soil improver, and particularly relates to a silicon-calcium-potassium-magnesium type soil improver and a preparation method thereof. The preparation method comprises the following steps: S1, adding quicklime into a sodium silicate solution to perform a reaction, separating, and drying to obtain calcium silicate with a water content of 0-80%; S2, uniformly mixing the calcium silicate, a magnesium salt / molecular sieve / modified cellulose, and a potassium salt / modified chitosan to obtain a mixture; and S3, spraying an alcohol solution containing alkyl quaternary ammonium salt modified palygorskite on the mixture, stirring, and drying to obtain the silicon-calcium-potassium-magnesium type soil improver. The silicon-calcium-potassium-magnesium type soil improver can meet the index requirements of the national standard GB / T 36207-2018 'Silicon-calcium-potassium-magnesium type fertilizer', and has good slow-release effect, storage stability, can improve the pH of acidic soil, and can increase the organic matter content of soil.

The invention provides a modified roadbed material based on a gneiss weathered material and a construction method of a roadbed. The modified roadbed material comprises the gneiss weathered material, a solid admixture, a sodium silicate solution, gneiss-based mullite whiskers and a carbon fiber net body, by adopting the modified roadbed material and cooperating with the roadbed construction method provided by the invention, the compressive strength, the water resistance, the erosion resistance and the structural compactness of the modified roadbed material are effectively and greatly enhanced, and the modified roadbed material can meet the core performance requirements of the roadbed material on high-strength bearing and excellent water stability; and meanwhile, the method has the remarkable characteristics of low cost, outstanding environmental protection property, simplicity and convenience in construction operation and the like, and finally creates an innovative technical path for traffic engineering construction in gneiss weathering distribution areas.

A preparation method of lawn bricks capable of solidifying and stabilizing lead-contaminated soil includes: preparing carbonized bagasse, grinding and mixing the carbonized bagasse and potassium carbonate in a mortar, heating the resulting mixture to 600-650° C., and maintaining for 2-3 hours; fully mixing the carbonized and treated bagasse, heavily-lead-contaminated soil, construction waste and fly ash; then adding a treated sodium silicate solution and stirring, and reacting under ultrasonic conditions; and performing grouting and compacting to obtain a homogeneous green brick, and curing same to obtain a lawn brick. The bagasse is taken as a raw material, and is carbonized and then mixed with the pre-treated heavily-Pb-contaminated soil, construction waste and fly ash, and under an action of alkali excitation and ultrasonic assistance, the resulting mixture is cured to form the lawn brick, such that Pb (II) in the Pb-contaminated soil is not migrated and converted any more.

The invention belongs to the technical field of composite material preparation, and particularly discloses a modification method of an alkali-activated cement-straw composite material. The method comprises the following steps: mixing straws with a sodium silicate solution with the mass concentration of 5%-10%, stirring until the solution is completely absorbed, flattening the treated straws, and curing under natural conditions to obtain pretreated straws; mixing with a sodium silicate solution with the mass concentration of 5%-10%, stirring until the solution is completely absorbed, adding the alkali-activated cement precursor material, and uniformly stirring to obtain a mixture; dissolving an exciting agent in water for mixing to form a solution, adding the solution into the stirrer, and uniformly stirring with the mixture to obtain a freshly stirred composite material; and after 24 hours, removing the mold and maintaining to obtain the hardened alkali-activated cement-straw composite material. The invention discloses a modification method of an alkali-activated cement-straw composite material, which can effectively prevent polysaccharide substances in straws from being dissolved out, and solves the problem of poor compatibility of alkali-activated cement and straws.

The application discloses high-entropy rare earth silicate ceramic nano powder and a preparation method and application thereof. The preparation method of the high-entropy rare earth silicate ceramic nano powder comprises the following steps: 1) dissolving rare earth oxide powder in an acid solution to prepare a rare earth salt solution; 2) mixing the rare earth salt solution and a sodium silicate solution, adding ammonia water to perform chemical co-precipitation, then performing standing and aging, and then taking the precipitate to perform drying to obtain a precursor powder; and 3) placing the precursor powder under the condition that the temperature is 1100 DEG C to 1200 DEG C to perform calcination. The high-entropy rare earth silicate ceramic nano powder has excellent characteristics such as small particle size, uniform element distribution, large component space and no impurity phase, and the preparation method has the advantages of low synthesis temperature, simple equipment, simple and controllable process, low industrialization cost and the like, is suitable for being used on a hot end part of an aerospace engine and has a very wide application prospect.

The invention relates to the technical field of geotechnical engineering reinforcing materials, in particular to a high-strength pumpable anchoring agent and a preparation method and application thereof. The anchoring agent is composed of a component A and a component B, wherein the component A comprises 60-80 parts of a first sodium silicate solution, 20-40 parts of a second sodium silicate solution, 2-8 parts of a catalyst, 5-20 parts of a chain extender, 1-5 parts of a thixotropic agent and 0.5-2 parts of a reinforcing agent; the component B comprises the following components in parts by weight: 90-110 parts of isocyanate substances, 10-30 parts of a plasticizer and 2-6 parts of polyether polyol. According to the preparation method, a one-step mechanical blending process is adopted, and the component A and the component B are respectively mixed, stirred and defoamed. Through synergistic compounding of specific components, a traditional complex pre-polymerization process is abandoned, and the obtained anchoring agent has the advantages of being simple in preparation process, controllable in curing time, high in compressive strength, good in pumpability, environmentally friendly, safe and the like, and is particularly suitable for rock-soil anchoring of underground engineering such as coal mines and tunnels.