121 results about "SODIUM SILICATE SOLN" patented technology

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 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.

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 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 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 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.

The present application relates to the technical field of silica sol preparation, and particularly relates to a preparation method of non-spherical high-purity silica sol, and a product and application thereof. The preparation method comprises the following steps: obtaining an active silicic acid component by subjecting a high-purity sodium silicate solution to cation exchange resin; mixing an alkaline catalyst and the active silicic acid component in different feeding sequences, and obtaining non-spherical seeds by aging; heating the seed mother liquor to boiling, adding the active silicic acid component dropwise and controlling pH, and cooling after constant liquid level growth; and obtaining non-spherical high-purity silica sol by ultrafiltration concentration. By controlling the feeding sequence and key process parameters, the present application can prepare a silica sol product with controllable morphology (linear, spherical or potato-shaped), uniform particle size and high purity. When the obtained product is used as a CMP abrasive, the polishing removal rate is increased by more than 25% compared with spherical silica sol, the product is suitable for industrial production, and can be widely applied to the field of semiconductor polishing.

This invention relates to a method for remediating arsenic-contaminated farmland; the method includes the following steps: applying base fertilizer to the farmland and tilling it evenly, wherein the base fertilizer includes organic fertilizer, and the amount of organic fertilizer applied is 200-500 kg / mu; transplanting cotton seedlings into the farmland and managing water; irrigating the cotton seedlings with a prepared sodium silicate solution; managing fertilizer and planting during the cotton growth process, and applying an activator that promotes the translocation of heavy metals into the cotton plants; harvesting the cotton when it matures and cutting the straw. This remediation method, through planting cotton and using organic fertilizer, irrigation with sodium silicate solution, and application of an activator, can promote the absorption of the heavy metal arsenic by plants, thereby reducing the arsenic content in the soil while ensuring the economic benefits of the farmland. The planting technique is simple, highly operable, and can effectively solve the problem of planting in arsenic-contaminated farmland.

The application provides a gangue mineral dispersion inhibitor and a preparation method and application thereof, and relates to the field of mineral flotation. The preparation method of the gangue mineral dispersion inhibitor comprises the following steps: mixing phytic acid, oxalic acid and sodium silicate with water to obtain a sodium silicate solution; wherein the mass ratio of the phytic acid, the oxalic acid and the sodium silicate is 1:(1-2):(2-4). The gangue mineral dispersion inhibitor can be used in the process of recovering ilmenite from iron ore tailings. The phytic acid, the oxalic acid and the sodium silicate cooperate with each other, can effectively inhibit various gangue minerals, effectively improve the grade and recovery rate of ilmenite, and improve the problem that ilmenite in the iron ore tailings is difficult to be efficiently recovered.

The present application discloses a negative carbon geopolymer slurry, a negative carbon geopolymer and preparation methods thereof. After introducing a carbon dioxide gas into a hydroxide solution, the geopolymer slurry is prepared (sequentially mixed with a sodium silicate solution, fly ash and furnace stone powder are mixed) to form a negative carbon geopolymer slurry with carbon storage function. Moreover, the negative carbon geopolymer slurry formed by this preparation method not only has low preparation cost, but also the negative carbon geopolymer subsequently prepared has certain economic value.

The utility model relates to the technical field of silica gel cat litter production, in particular to a gel making surge tank for silica gel cat litter production, which comprises a base and a placing box arranged at the upper end of the base. And the discharging assembly comprises two sets of push plates which are inserted into the inner wall of the containing box and are symmetrical to each other, two sets of storage cylinders which are symmetrical to each other are arranged in the containing box, and push rods are inserted into the middle ends of the storage cylinders. Air is injected into the containing box through two air inlet pipes at the same time, the air pressure in the containing box is increased, the two push plates are pushed to move when the air pressure in the containing box is increased, and therefore solutions in the containing box can be pressed into the reaction tank at the same time for a reaction; the moving distances of the two push plates can be respectively controlled by controlling the air inflow of the two air inlet pipes and the air pressure in the placing box, so that the feeding contents of the sodium silicate solution and the sulfuric acid solution can be respectively controlled, namely the feeding proportion of the sodium silicate solution and the sulfuric acid solution can be controlled.

The invention provides a shield muck improvement method for a water-rich coarse-particle stratum, and relates to the technical field of shield muck improvement, and the method comprises the following steps: calculating the volume Vs of a soil body cut by a cutter head of a shield tunneling machine in unit time according to the excavation diameter D and the tunneling speed v of the shield tunneling machine and the loose coefficient K of the coarse-particle stratum; calculating the flow q of the calcium-based clay mineral-sodium silicate mixed slurry in unit time by combining Vs with the injection ratio KIR; according to the preset volume ratio M of the calcium-based clay mineral slurry to the sodium silicate solution and the number N and q of the mixing containers, the flow qK and qG of the two raw materials in the single mixing container in unit time are calculated; starting a shield tunneling machine, pumping the two raw materials into a mixing container according to qK and qG by a pumping device to prepare mixed slurry, and injecting the mixed slurry into a soil bin to be mixed with shield muck. The mixed slurry mixes the shield muck with underground water by virtue of good bonding capacity, improves the plastic flow state of the muck, reduces the permeability, and avoids spewing and stagnant discharge of the muck, so that the stability of a tunnel face is guaranteed.

This invention discloses an insulating coating method for ultrafine soft magnetic powder. First, a water glass mixed solution is prepared using sodium silicate solution and deionized water. Then, metal raw materials are weighed, mixed, and smelted / atomized. Finally, nitrogen gas is introduced for pressure filtration, and the powder is dried and sieved. The modulus of the sodium silicate solution is 2.3 or 3.3, and the sodium silicate concentration in the water glass mixed solution is 0.5-10%. This invention uses the water glass mixed solution prepared from sodium silicate and deionized water as the atomizing water, directly forming an insulating coating on the powder surface during the smelting / atomization process. The coating is more uniform, and the powder exhibits better magnetic properties, eliminating the need for subsequent additional insulating coating and reducing the risk of flammability and explosion during operation. Simultaneously, the reduced surface tension of the atomizing water significantly reduces crushing energy consumption. The increased internal water viscosity prevents the powder from colliding and agglomerating again, retaining a finer particle size.

The invention belongs to the technical field of shield under-pressure bin opening, and particularly provides a composite clay mixed solution and application thereof, and the composite clay mixed solution is prepared from bentonite slurry, methyl cellulose and slaked lime; the bentonite slurry is obtained by mixing a bentonite solution and a sodium silicate solution, and the bentonite solution is obtained by mixing water and sodium bentonite. According to the composite clay mixed solution provided by the invention, methyl cellulose and slaked lime are introduced to synergistically enhance a system; specifically, methyl cellulose (MC) is used as a non-ionic thickening agent, and methoxyl (-OCH3) on a molecular chain of the methyl cellulose (MC) improves the consistency of a system through hydrogen-bond interaction. MC with the viscosity of 4000 mPa.s is selected in an experiment, and the addition amount of the MC is 0.3%-0.5% of the mass of the bentonite; the slaked lime and SiO2 in the bentonite are subjected to a pozzolanic reaction, and the shear strength of the system can be increased to 2.8 kPa within 6 h through the reaction.

The invention relates to the technical field of engineering materials, in particular to a pumpable water-resistant anchoring agent as well as a preparation method and application thereof. The anchoring agent is a two-component system, wherein a component A comprises a first sodium silicate solution, a second sodium silicate solution, a catalyst, a chain extender, a nano inorganic filler and a super-hydrophobic coupling agent; and the component B comprises an isocyanate substance, a plasticizer, hydrophobic isocyanate and polyether polyol. Hydrophobic components are introduced into a polyurethane curing network in a chemical bonding mode, a chemical crosslinking type water-resistant mechanism is constructed, and the long-term bonding strength retention rate and the impermeability of the anchoring agent in the underwater environment are remarkably improved by cooperating with the double effects of physical hole plugging and chemical hydrophobicity of the nanofiller subjected to hydrophobic modification. Meanwhile, by optimizing the component proportion and viscosity, the product has excellent pumpability, and is especially suitable for anchoring construction in wet or underwater environments such as deep tunnels and water conservancy projects.

A premixing method of expandable polystyrene particles and sodium silicate solution, characterized in that a premixing device is provided above a drying stirrer and is connected with an expandable polystyrene particle bin and a sodium silicate solution bin respectively, when it is needed to premix expandable polystyrene particles and sodium silicate solution, expandable polystyrene particles are provided, and according to the volume ratio, 0.3-0.4 times of the volume of the expandable polystyrene particles of sodium silicate solution, while spraying industrial sodium silicate solution in the cylinder by starting the atomizing nozzle, the expandable polystyrene particles are carried by the pressurized gas and sprayed to the sprayed sodium silicate solution, and the premixing of the expandable polystyrene particles and the sodium silicate solution is completed in the cylinder of the premixing device. The method provided by the application can greatly reduce the input amount of sodium silicate solution.

This invention belongs to the field of wastewater treatment technology, specifically relating to a method for preparing a sponge iron-based ferrous silicate reducing agent for wastewater treatment. Sponge iron is activated in a dilute phosphoric acid solution to obtain activated sponge iron; the activated sponge iron is washed and then immersed in a ferrous solution, removed and washed, and then matured in a sodium silicate solution to obtain matured sponge iron; the matured sponge iron is washed and freeze-dried to obtain the sponge iron-based ferrous silicate reducing agent. The sponge iron-based ferrous silicate reducing agent prepared by this invention is easily separated from the effluent and has excellent and long-lasting reducing performance. It solves the problems of high reducing agent dosage, high salinity of the treated effluent, generation of large amounts of iron sludge, and the need for continuous addition of reducing agent in traditional reduction processes. Furthermore, the preparation method is simple, requiring no complex equipment or catalysts, and the raw material, sponge iron, is inexpensive and widely available, resulting in low production costs and suitability for large-scale preparation and engineering applications.

The invention is suitable for the technical field of desulfurization, and provides a desulfurization method for preparing clean coal. Comprising the following specific operation steps: S1, preparing raw materials: 10 parts of raw coal, 0.4-1.2 parts of calcium hydroxide, 0.1-0.2 part of calcium-based montmorillonite, 2-3 parts of a sodium chloride solution, 0.6-1.5 parts of a sodium silicate solution and 0.5-1.3 parts of diluted hydrochloric acid, wherein the raw materials comprise pulverized coal, calcium hydroxide, calcium-based montmorillonite, sodium chloride solution, sodium silicate solution and diluted hydrochloric acid; s2, mixing calcium-based montmorillonite with a sodium chloride solution, slowly adding diluted hydrochloric acid into the intercalated slurry, adjusting the pH value to 4-5, adding nano SiO as a supplementary silicon source, stirring for 2 hours, and carrying out ball milling on the mixture after stirring to promote dispersion of SiO and anchoring between montmorillonite layers; and S3, mixing the montmorillonite-SiO carrier with nano sodium bicarbonate, adding deionized water, and performing ultrasonic dispersion. According to the desulfurization method for preparing the clean coal, mechanical mixing is compatible with conventional combustion equipment, so that an existing production line does not need to be transformed, secondary pollution (such as VOCs emission) is avoided, the resource utilization rate of byproducts is high, and the method is suitable for industrial production. And the desulfurization of the clean coal is more efficient.

The application relates to the field of silica preparation, and particularly discloses a preparation method of precipitated silica with low hydroxyl content, wherein solid sodium silicate with a modulus of 3.0-3.5 is selected, a water glass solution with a concentration of 15-20 wt% is prepared, and sulfuric acid with a concentration of 18-25 wt% is prepared as an acidifying agent; SO2, calcium hydroxide is added into the prepared sodium silicate solution, impurity removal and purification treatment are carried out, and after standing and filtering, the purified sodium silicate solution which can be used for reaction is obtained. Through precise control of the reaction conditions, the parameters such as acid-base flow rate, reaction temperature and pH in different reaction stages are controlled, the surface hydroxyl content of the target product is significantly reduced, and before preparation, the impurity-removed water glass solution is obtained by taking calcium hydroxide as a sodium silicate purifying agent, so that the purity of the reaction product is higher, and when the reaction product is used for rubber mixing, the reaction product is not prone to agglomeration and thickening.

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

The application belongs to the technical field of sewage treatment, and particularly relates to a flocculant for sewage treatment and a preparation method thereof. The method comprises the following steps: S1, adding a sodium silicate solution to an aluminum salt and an iron salt to perform a polymerization reaction to obtain a polysilicate aluminum iron sol; S2, preparing a nano-cellulose graft copolymer emulsion; S3, mixing the polysilicate aluminum iron sol and the nano-cellulose graft copolymer emulsion to obtain a composite flocculation product; and S4, drying and crushing the obtained composite flocculation product to obtain the flocculant for sewage treatment. By means of cross-linking promoters, covalent bridges are constructed between inorganic components of the polysilicate aluminum iron and organic components of the nano-cellulose, and a stable inorganic-organic three-dimensional interpenetrating network is formed, so that the problem of easy phase separation and unstable performance of traditional physical compounded flocculants is fundamentally solved, and the uniformity and storage stability of the product are significantly improved.

The invention discloses a preparation method and application of a sulfydryl modified magnesium silicate passivator, and the preparation method comprises the following steps: adding a magnesium chloride hexahydrate solution into a sodium silicate pentahydrate solution, stirring, aging, washing and drying to obtain a magnesium silicate matrix; weighing a certain amount of the magnesium silicate matrix, and dispersing the magnesium silicate matrix in a container filled with a proper amount of an organic solvent; in an inert atmosphere, mercaptopropyltrimethoxysilane is added into the container, a heating reflux reaction is carried out, and the mass ratio of the magnesium silicate matrix to mercaptopropyltrimethoxysilane is 1: (0.2-6); after the reaction is finished, filtering, washing and drying a product to obtain the sulfydryl modified magnesium silicate. According to the invention, it is found that when the mass ratio of magnesium silicate to mercaptopropyltrimethoxysilane is 1: 3, the ratio is optimal, active sites on the surface of magnesium silicate are fully utilized under the ratio, mercaptopropyltrimethoxysilane is not subjected to over-amount self-polymerization and leaves unreacted hydroxyl groups in insufficient amount, mercapto groups are introduced to form stable Cd-S covalent bonds, and the cadmium fixing ability is improved.