347 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 belongs to the technical field of quartz sand preparation, and discloses high-purity quartz sand and a preparation method thereof. The method comprises the following steps: by taking water, mixed alkali and silicon powder as raw materials, uniformly stirring the silicon powder, the water and an additive to prepare silicon sludge, adding the rest raw materials into a reaction kettle, heating, then adding the silicon sludge into the reaction kettle in a frequency division manner, reacting to obtain a sodium silicate solution, removing anion and cation impurities, then adding an acid solution, heating to obtain silicic acid gel, and drying to obtain the silica gel. The silicic acid gel is subjected to freezing treatment, vacuum microwave drying and chloridizing roasting after unfreezing are conducted, and the high-purity quartz sand is obtained. According to the preparation method, the quartz sand with the purity higher than 99.9999% can be synthesized, the granularity of the quartz sand can be controlled according to the adding proportion of the acid solution, the content of gas-liquid inclusion in the quartz sand is remarkably reduced, and the quality of the quartz sand is improved.

The invention relates to the technical field of fluorine-containing sewage treatment, in particular to an adsorption type fluorine removal agent and a preparation method and application thereof.The preparation method comprises the following steps that 1, a sodium silicate solution is slowly added into a hydrochloric acid aqueous solution, and the pH is controlled to be 3-5; 2) adding a polyhydroxy high-molecular organic matter, stirring and dissolving, and reacting to obtain modified polysilicic acid; (3) adding a water-soluble dispersing agent into the modified polysilicic acid, gradually adding aluminum salt, magnesium salt and lanthanum salt, and uniformly stirring to obtain a modified polysilicate aluminum magnesium lanthanum mixed solution; 4) dropwise adding the modified polysilicate aluminum magnesium lanthanum mixed solution into a sodium carbonate solution, and soaking for 12-24 hours; and 5) leaching with pure water, draining water on the surface, pre-freezing, and then drying to obtain the adsorption type fluorine removal agent modified polysilicate aluminum magnesium lanthanum particles. The adsorption capacity of the adsorption type fluorine removal agent prepared by the method on fluorine ions reaches up to 480mg / g, the fluorine ion content of effluent can be as low as 0.1 mg / L or below, and meanwhile, the regeneration efficiency can reach 96% or above.

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 a method for manufacturing a high-wear-resistant composite swing hammer head, which comprises the following steps: washing and drying ceramic particles with an oxalic acid solution, uniformly mixing boron carbide ceramic powder and an alcohol adhesive in proportion into a slurry, and drying to remove the alcohol adhesive; then mixing the ceramic particles with NiCrBSi powder and a sodium silicate solution and filling the mixture into a honeycomb mold, taking the mixture out after microwave curing, thereby obtaining a honeycomb ceramic preform with high strength at room temperature, wherein a conical preformed hole is formed on the honeycomb ceramic preform, placing the honeycomb ceramic preform into a casting cavity of a swing hammer head metal mold, and then pouring molten high-chromium cast iron into a runner of the casting mold, wherein the high-chromium cast iron water infiltrates into gaps between ceramic preform particles under high pressure to form a reactive interface, thereby obtaining a high-wear-resistant composite swing hammer head. The method can manufacture a composite swing hammer head with a reactive interface and high wear resistance.

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 present invention relates to a multi-stage ion exchange resin tank control method and system, and a storage medium. The method comprises: H1, starting a production line, on the basis of a flow sensor on each stage of ion exchange resin tank, obtaining flow data information of a sodium silicate solution, and on the basis of a timer on each stage of ion exchange resin tank, obtaining filtering time data information of a current resin tank; H2, inputting, into a system identification model of silica sol liquid conductivity in a mixed ion exchange resin tank established by a neural network, the flow data information of the sodium silicate solution and the filtering time data information of the current resin tank for training and learning, and outputting conductivity data information of the current resin tank; and H3, inputting, into a proportional valve model, the conductivity data information of the current resin tank for simulation training. The present invention can not only achieve production of a high-quality desalted silica sol with conductivity lower than 20 μs / cm and a neutral pH value, but also improve the production efficiency of the silica sol.

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 gradient pore structure geopolymer asphalt mixture warm mixing agent which is composed of the following components in parts by weight: 65-85 parts of regenerated micro powder, 15-35 parts of rice hull ash, 15-20 parts of a sodium silicate solution, 5-10 parts of sodium hydroxide and 10-20 parts of deionized water. The invention also discloses a preparation method of the geopolymer asphalt mixture warm mixing agent. The geopolymer asphalt mixture warm-mixing agent has a gradient pore structure and has no closed pores or semi-closed pores, so that the water carrying capacity in the geopolymer asphalt mixture warm-mixing agent can be greatly improved, and the pore structure is arranged in a gradient manner (gradually released from large pores to small pores), so that the water release period of the warm-mixing agent can be effectively prolonged, and meanwhile, the water release rate can be uniform; compared with a hot-mixed asphalt mixture, the geopolymer asphalt warm-mixing agent with the gradient pore structure has the advantages that the mixing temperature of the asphalt mixture can be remarkably reduced, and meanwhile, the high and low temperature performance, the water damage resistance and the fatigue resistance of the asphalt mixture can be 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 dechlorinated and detoxified fly ash-waste glass powder-slag composite alkali-activated cementing material and a preparation method thereof. The alkali-activated cementing material takes hydrated calcium aluminosilicate gel and hydrated sodium aluminosilicate gel as main components, and comprises the following raw materials: dechlorinated and detoxified fly ash, waste glass powder, slag and an alkali activator, and the alkali activator is prepared from a sodium silicate solution and a sodium hydroxide solid; the raw materials are scientifically proportioned, so that efficient resource utilization is realized, and the performance of the alkali-activated cementing material is improved. The selected precursor is rich in active mineral components such as calcium, silicon and aluminum, an alkali activator prepared by adding a sodium silicate solution and a sodium hydroxide solid provides an ideal alkaline environment for a system, and the system can generate C-A-S-H gel and N-A-S-H gel at the same time due to complementary and synergistic effects of chemical components of all the components. Therefore, the material properties of high compressive strength, moderate setting time and reaction heat balance are realized, and meanwhile, good working performance and long-term durability are realized.

The invention relates to the technical field of flocculating agents, and discloses a flocculating agent for high-concentration azo printing and dyeing wastewater, which is prepared from the following components in parts by weight: 4 to 5 parts of hydroxypropyl chitosan derivative, 2 to 3 parts of sodium silicate solution, 0.5 to 1 part of sulfuric acid, 2 to 3 parts of ferric sulfate solution, 1 to 3 parts of zinc sulfate solution, and 4 to 5 parts of polyaluminum chloride solution and composite antibacterial agent. The preparation method comprises the following steps: preparing a sodium silicate solution, slowly dropwise adding the sodium silicate solution into sulfuric acid, and activating to obtain a polysilicic acid solution; sequentially adding a ferric sulfate solution, a zinc sulfate solution and a 50-500mg / L polyaluminum chloride solution, and standing and curing to obtain the polysilicate ferric zinc aluminum flocculant. The preparation method comprises the following steps: firstly, preparing a polysilicate ferric zinc aluminum flocculant, then slowly adding a melamine solution, carrying out ultrasonic action to obtain a carbonitrided polysilicate ferric zinc aluminum flocculant, and carrying out carbonitriding treatment on the polysilicate ferric zinc aluminum flocculant combined with metal ions to delay gelation of the polysilicate flocculant, so that the polysilicate flocculant can be stored for a longer time.

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 synthesis method and application of a Bi2SiO5 / g-C3N5 composite material, a sodium silicate solution is added into a bismuth salt solution, pH is adjusted to be alkaline, a hydrothermal reaction is performed, and after the hydrothermal reaction, filtering, washing, drying and stoving are performed to obtain Bi2SiO5; the preparation method comprises the following steps: carrying out thermal decomposition on 3-amino-1, 2, 4-triazole to prepare g-C3N5; the preparation method comprises the following steps: mixing Bi2SiO5, hexadecyl trimethyl ammonium bromide (CTAB), ethylene glycol and g-C3N5 to obtain a mixed solution, adding Bi2SiO5 into the mixed solution, uniformly stirring, and carrying out a hydrothermal reaction to obtain the Bi2SiO5 / g-C3N5 composite material catalyst. Bi2SiO5-g-C3N5 is prepared by using a hydrothermal method, an organic pollutant solution is degraded under light irradiation, and the degradation capability of the Bi2SiO5-g-C3N5 is tested. Results prove that the active sites, the absorption spectrum, the specific surface area and the catalytic ability of the composite material are all improved under the combined action of holes and heterojunctions.

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 provides a method for preparing high-purity silicon dioxide from laterite-nickel ore acid leaching residues. The method comprises the following steps: (1) dissolving the acid leaching residues and a soluble alkali solution for reaction to obtain a sodium silicate solution; (2) introducing CO2 gas into the sodium silicate solution, and carrying out secondary carbonization separation to obtain crude SiO2 precipitate; and (3) carrying out H2SO4 acid pickling, water washing and solid-liquid separation on the crude SiO2 precipitate, and drying and roasting the separated solid phase to obtain the high-purity silicon dioxide. The method for preparing the high-purity silicon dioxide from the laterite-nickel ore acid leaching residues is simple in technological process, low in raw material price, low in synthesis cost, simple and feasible in synthesis process in industry and low in energy consumption.

The invention relates to the technical field of fluorine-containing sewage treatment, in particular to an adsorption type fluorine removal agent and a preparation method and application thereof.The preparation method comprises the following steps that 1, a sodium silicate solution is slowly added into a hydrochloric acid aqueous solution, and the pH is controlled to be 3-5; 2) adding a polyhydroxy high-molecular organic matter, stirring and dissolving, and reacting to obtain modified polysilicic acid; (3) adding a water-soluble dispersing agent into the modified polysilicic acid, gradually adding aluminum salt, magnesium salt and lanthanum salt, and uniformly stirring to obtain a modified polysilicate aluminum magnesium lanthanum mixed solution; 4) dropwise adding the modified polysilicate aluminum magnesium lanthanum mixed solution into a sodium carbonate solution, and soaking for 12-24 hours; 5, pure water is used for leaching, surface moisture is drained, pre-freezing is conducted firstly, then drying is conducted, and the adsorption type fluorine removal agent modified polysilicate aluminum magnesium lanthanum particles are obtained.According to the adsorption type fluorine removal agent prepared through the method, the fluorine ion adsorption capacity reaches up to 480 mg / g, the fluorine ion content of outlet water can be as low as 0.1 mg / L or below, and meanwhile the regeneration efficiency can reach 96% or above.

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 of silicon dioxide for a powder coating, and belongs to the technical field of precipitation method silicon dioxide preparation, a sodium silicate solution with a specific modulus is selected to be prepared into a proper concentration, and a large amount of silicic acid is generated in the solution in combination with a specific proportion, temperature and early-stage rapid acid adding mode; a large number of uniform primary silicon dioxide particles can be quickly formed, the silicon dioxide particles with high specific surface area and high surface energy are finally separated out, and the growth and aggregation of the silicon dioxide particles are effectively controlled in a manner of slowly adding acid according to a specific proportion and temperature subsequently, so that the silicon dioxide aggregate with uniform particle size is formed; the water-soluble amino acid is added into the silicon dioxide slurry, so that the silicon dioxide particles are endowed with charge property, the finally dried silicon dioxide powder can be directly used in the powder coating, mechanical crushing is not needed again, the energy consumption is reduced, a surfactant is not needed, the influence on the environment in the production process can be avoided, and the method is energy-saving and environment-friendly.

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.;