282 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 a selective desiliconization method for alkaline vanadium liquid. According to the process, magnesium-aluminum hydrotalcite prepared in advance is introduced into the alkaline vanadium liquid, the pH does not need to be regulated and controlled, silicon can be selectively adsorbed, desilicication slag is desorbed and then recycled as a desilicication agent, and a sodium silicate-containing solution can be used for preparing a water glass product. According to the method for deeply adsorbing silicon in the alkaline vanadium liquid by adopting the magnesium-aluminum hydrotalcite, various conditions of an existing process are not greatly changed, disturbance to existing industrial production is small, meanwhile, the problems that the desilicication limit of the alkaline vanadium liquid is insufficient and vanadium loss is high at present can be solved, silicon in the alkaline vanadium liquid can be reduced to 30 mg / L or below, and the requirements of vanadium products are met.

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 provides an anti-aging medium and low voltage polyvinyl chloride cable, which comprises an outer layer insulation skin, sealing rubber sleeves are glued on two sides of the outer layer insulation skin, a protection assembly is arranged on the inner wall of the outer layer insulation skin, the protection assembly comprises a separation rubber sheet, the separation rubber sheet is arranged on the inner wall of the outer layer insulation skin, and the separation rubber sheet is arranged on the inner wall of the outer layer insulation skin. A liquid bin is reserved between the two sets of separation films, the liquid bin is filled with a sodium silicate solution, a separation sleeve is arranged on the inner wall of the outer layer insulation skin, a liquid layer is embedded in the separation sleeve, and a repairing assembly is embedded in the liquid layer. When the outer insulating layer is damaged by external force, the isolation triggering protective layer is accurately broken to release aluminum oxide powder and a sodium silicate solution, the aluminum oxide powder and the sodium silicate solution are mixed and then rapidly react to generate a high-insulation and high-strength aluminosilicate hardened body, and sealing and leaking stoppage, structural reinforcement and flame retardance enhancement of a damaged part are synchronously achieved; and self-repairing can be completed without manual intervention.

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 discloses a white carbon black preparation method based on rice husk resource utilization, which comprises the following steps: carbonization: drying rice husks, carrying out anoxic carbonization at 550-600 DEG C for 3-4 hours, crushing and sieving; alkali dissolution: mixing the carbonized rice husks with a 2mol / L NaOH solution according to a mass ratio of 1: (5-7), reacting in a water bath at 95 DEG C for 3-4 hours, and filtering to obtain a sodium silicate solution; acid leaching: slowly adding a 9-10% H2SO4 solution into the filtrate, firstly adjusting the pH value to 11-12, aging for 1 hour, then adjusting the pH value to 9-10, and aging for 2-3 hours at 80 DEG C; post-treatment: washing to be neutral, and drying to obtain a white carbon black product. The specific surface area of the product is larger than or equal to 200 m < 2 > / g, the SiO2 purity is larger than or equal to 95%, efficient comprehensive utilization of rice hull resources is achieved, and the white carbon black production cost is reduced; a staged pH regulation and control process is developed, and the amorphous state purity of the white carbon black is improved; and a carbonization-alkali dissolution-acid leaching whole-flow process system is constructed, so that the environmental pollution is reduced.

The invention relates to the technical field of metallurgy, in particular to a high-aluminum coal gangue desiliconization method which comprises the following steps: crushing and grinding high-aluminum coal gangue to obtain pretreated high-aluminum coal gangue; roasting and cooling the pretreated high-aluminum coal gangue to obtain activated coal gangue; mixing a sodium hydroxide solution with the activated coal gangue for reaction to obtain desiliconized slurry; filtering the desiliconized slurry, wherein a liquid phase is a sodium silicate solution; and washing the solid phase with water, and drying to obtain the desiliconized fly ash. The coal gangue selected by the invention is high-aluminum coal gangue, the aluminum content of the raw ore is 35-38%, the aluminum-silicon ratio of the raw ore is 0.8-0.9, the aluminum-silicon ratio after roasting activation reaches 0.85-0.95, and the aluminum-silicon ratio after one-step desiliconization can reach 5-8. Compared with the existing desiliconization technology, the technology not only can greatly improve the aluminum-silicon specific speed, but also can replace bauxite to be used as a raw material for preparing aluminum oxide by a Bayer process, so that the production cost is greatly reduced, and the utilization rate of resources is improved.

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 silica sol and a preparation method thereof, and belongs to the technical field of silica sol preparation, the silica sol comprises sodium silicate solution, cation exchange resin, anion exchange resin, stabilizer, sodium hydroxide solution, deionized water and hydrochloric acid dilute solution, the sodium silicate solution contains SiO2 (20%) and Na2O (0.15%), the cation exchange resin is 5-10 parts, the anion exchange resin is 5-10 parts, the stabilizer is 5-10 parts, the sodium hydroxide solution is 5-10 parts, the deionized water is 5-10 parts, and the hydrochloric acid dilute solution is 5-10 parts. The sodium silicate solution is prepared from 4-9 parts of cation exchange resin and 4-9 parts of anion exchange resin, the cation exchange resin is used for removing sodium ions in the sodium silicate solution, the anion exchange resin is used for further removing anion impurities in the polysilicic acid solution, and the stabilizer is 2-5% of the mole number of SiO2. The used ion exchange resin has good regeneration performance and can be reused through the regeneration process, the production cost is reduced, and the ion exchange method does not need to use a large amount of organic solvents.

The invention belongs to the technical field of electrothermal materials, and particularly relates to an early-strength and high-electrothermal geopolymer which is at least prepared from three materials, namely metakaolin, carbon fibers and an alkali activator, and a preparation method of the early-strength and high-electrothermal geopolymer comprises the following steps: step 1, adding sodium hydroxide into a sodium silicate solution, stirring the mixture to obtain the alkali activator, and standing at normal temperature for 24 hours; step 2, pouring metakaolin powder and carbon fibers into a crusher, and then quickly stirring to obtain mixed powder; step 3, adding alumina fiber and polyacrylamide into the alkali activator, and stirring and mixing; 4, the mixed powder obtained in the step 2 is added into the prepared alkali activator, slow stirring is conducted firstly, then rapid stirring is conducted, then slurry is poured into a silica gel mold, and bubbles in the slurry are removed through vibration; step 5, maintaining and curing the sample at 60 DEG C; and 6, placing the cured test piece at the temperature of 400 DEG C for 15 minutes. The geopolymer obtained by the invention has the characteristics of early strength and high electric heating.

The invention discloses a preparation method and application of a polymeric lanthanum silicate efficient coagulant, and the preparation method comprises the following steps: adding an acid solution into an obtained sodium silicate solution, continuously stirring, controlling the pH value of a mixed solution in the reaction process, standing and curing to obtain a polysilicic acid solution; adding a lanthanum chloride solution into the obtained polysilicic acid solution, controlling the temperature and stirring at a high speed to obtain the high-efficiency polysilicate lanthanum coagulant. The invention provides a poly-lanthanum silicate coagulant system for algae control for the first time, La < 3 + > ions are introduced into a poly-silicic acid structure in a complexing form to form a composite coagulant meeting the requirement of efficient flocculation of algae, and the composite coagulant is different from a traditional single metal salt or polymer-based coagulant, can be applied to removal of high-concentration floating algae in a water body, and has the advantages of simple preparation process and low cost. The algae removal coagulant has the characteristics of low dosage, large generated floc, fast sedimentation and no dependence on additional coagulant aids or pH regulators, effectively solves the problem of large dosage of the existing algae removal coagulant, and aims to realize efficient removal of floating algae in water.

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 present invention discloses a mine fire prevention and extinguishing gel based on temperature-controlled release and its preparation method, belonging to the technical field of fire prevention and extinguishing materials. The mine fire prevention and extinguishing gel includes a sodium silicate solution and microcapsules. The microcapsules include a core composed of an acidic reagent and a capsule wall coated outside the core. The core is an acidic reagent, and the capsule wall is a copolymer of gelatin and polysaccharide. When the mine fire prevention and extinguishing gel flows through a suspected high-temperature area, if the gel encounters a real high-temperature area, the microcapsule wall material in the mine fire prevention and extinguishing gel melts, and the acidic substance wrapped by the wall material undergoes a phase change with the sodium silicate solution to generate a silicate gel. The formed silicate gel increases in viscosity, weakens in fluidity, and accumulates at the high-temperature location, completing the identification and residence of the real high-temperature area. It solves the problems of the traditional temperature-sensitive phase change gel having too high an initial viscosity before phase change, losing too much water during phase change, and slow gel formation, realizes the targeted identification and residence of high-temperature points in the fire area, and the material is non-toxic and has a low cost, with broad application prospects.

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 invention belongs to the technical field of soil conditioners, and particularly relates to a silicon-calcium-potassium-magnesium type soil conditioner and a preparation method thereof. The preparation method comprises the following steps: S1, adding quick lime into a sodium silicate solution to react, separating and drying to obtain calcium silicate with the water content of 0-80%; s2, uniformly mixing calcium silicate, magnesium salt / molecular sieve / modified cellulose and potassium salt / modified chitosan to obtain a mixture; and S3, spraying an alcoholic solution containing alkyl quaternary ammonium salt modified palygorskite on the mixture, stirring, and drying to obtain the product. The silicon-calcium-potassium-magnesium type soil conditioner disclosed by the invention can meet the index requirements of the national standard GB / T 36207-2018 'Silicon-calcium-potassium-magnesium Fertilizer', has good slow release effect and storage stability, improves the pH value of acid soil, and increases the content of organic matters in the soil.

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 relates to the technical field of environmental protection, and discloses a sewage treatment material and a preparation method and application thereof.The preparation method comprises the steps that a sodium silicate solution, aluminum oxide, titanium oxide and carbon nanotubes are mixed, gelatinized and dried, and carbon nanotube reinforced aerogel is prepared; a modification material is introduced to the surface of the aerogel through a chemical vapor deposition method, and modified aerogel is obtained; depositing a metal organic framework material on the surface of the modified aerogel by using a solvothermal method to prepare composite aerogel; the polytetrafluoroethylene film and the nanoscale composite metal material film are combined through a hot pressing method to form a double-layer net-shaped filter screen; finally, the composite aerogel is combined with a double-layer net-shaped filter screen, and the sewage treatment material is formed. The sewage treatment material and the method thereof provided by the invention have multiple advantages of high efficiency, rapidness, environmental protection, economy and the like, can effectively solve the problems of low efficiency, high cost, secondary pollution and the like in the existing sewage treatment technology, and have wide application prospects and popularization values.

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 relates to the technical field of white carbon black, and provides a production method of high-specific-surface-area high-dispersion white carbon black, which comprises the following steps: S1, adding an acid solution into a sodium silicate solution with the mass of 30-40% to adjust the pH value to 6-7, carrying out a first reaction, and aging to obtain a mixture A; s2, adding 20-30% by mass of a sodium silicate solution into the mixture A, adding an acid solution to adjust the pH value to 7.5-8.5, and carrying out a second reaction to obtain a mixture B; s3, adding the residual mass of the sodium silicate solution into the mixture B, adding an acid solution to adjust the pH value to 3.5-4.5, carrying out a third reaction, and carrying out post-treatment to obtain the white carbon black. According to the technical scheme, the problem that the specific surface area of the white carbon black in the related technology is relatively low is solved.

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 invention discloses a red mud-based geopolymer inorganic reflective coating and a preparation method thereof. The coating is prepared from Bayer process red mud, a sodium silicate solution, solid sodium hydroxide, styrene-acrylic emulsion, titanium dioxide, talcum powder, a defoaming agent, a flatting agent, a dispersing agent, an anti-settling agent, color paste, 240-mesh glass beads and 300-mesh glass beads. The red mud-based geopolymer inorganic reflective coating prepared by the invention has good adhesive force with a base layer, good mechanical property of a paint film, high pencil hardness and high reflection coefficient. The coating is used for tunnel hole interior decoration and mine hole brightening coating, the reflectivity of the tunnel coating can be effectively enhanced, the tunnel lighting effect is improved, and driving safety is guaranteed. The red mud and the alkali activator are used as geopolymer materials, so that the recycling of solid waste resources is realized, organic substance components in the coating are effectively reduced, and the fireproof performance is excellent.

Embodiments relate to methods for producing a high purity sodium silicate. The present application relates to a distinct pattern in elemental removal of various sodium silicate solutions, as sodium silicate solutions prepared at high SiO2 to Na2O mass ratios display better elemental removal than sodium silicate solutions prepared at low SiO2 to Na2O mass ratios. Methods therefore include at least (a) providing a biogenic silica; (b) adding the biogenic silica to a first solution (e.g., sodium silicate solution or caustic soda solution); (c) separating undissolved silica form the solution via dissolution to obtain an intermediate solution; and (d) conducting ultrafiltration on the intermediate solution to obtain the high purity sodium silicate.

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.