249results about "Magnesium silicates" patented technology

Crystalline magnesium silicates are synthesized from silica-containing brines, preferably spent geothermal brines, by mixing the brine with a magnesium-containing compound, adjusting the pH of the resultant mixture between 8.0 and 14, and crystallizing the magnesium silicate from the mixture at a temperature between 50° C. and 200° C. Kerolite is preferably synthesized from brine by adjusting the pH in a range between 9.5 and 10.5 and heating the mixture to between 100° C. and 170° C. to precipitate the crystalline kerolite. The brine remaining after the crystallization step is depleted in silica and can be further processed without significant problems caused by silica scaling.

A method of manufacturing a colloidal silica dispersion, by dissolving a fumed silica in an aqueous solvent having an alkali metal hydroxide to produce an alkaline silicate solution; removing the alkali metal via ion exchange to produce a silicic acid solution; adjusting the temperature, concentration and pH of the silicic acid solution to values sufficient to initiate nucleation and particle growth at elevated temperatures; and cooling the silicic acid solution at a rate sufficient to produce the colloidal silica dispersion. The colloidal silica particles in the colloidal silica dispersion have a mean particle size about 2 nm to about 100 nm. Also provided is a method of chemical mechanical polishing a surface of a substrate by contacting the substrate and a composition having a plurality of colloidal silica particles according to the present invention and a medium for suspending the particles. The contacting is carried out at a temperature and for a period of time sufficient to planarize the substrate.

The invention discloses a method for synthesizing high-purity forsterite by using magnesite tailings and talc tailings, which effectively utilizes tailings resources and can be used to produce high-density refractory materials used under high-temperature conditions above 1600°C. The present invention uses magnesite tailings and talc tailings as the main raw materials, adds additives and binders, and manufactures high-purity forsterite refractory raw materials through batching, mixing, molding, drying, high-temperature synthesis and crushing. The weight percent content of each component is as follows: 60-70% of fine magnesite tailings powder; 25-35% of talc tailings powder; 2-8% of additives; 5-10% of external binder. Using magnesite tailings and talc tailings to synthesize high-purity forsterite refractory raw materials, the use temperature is high (above 1600 ℃), the bulk density is high (greater than 2.55g/cm3), and the combined content of olivine and periclase is greater than 97%. The utility model has wide application field, comprehensive utilization of waste, and low production cost.

The invention provides a preparation method of micro-nano hydroxyl magnesium silicate. The method is capable of producing high-quality micro-nano hydroxyl magnesium silicate powder products in large scale. The method comprises the following steps: preparing sodium hydroxide into a 0.001-2mol/L solution; mixing nanometer magnesia and nanosilicon dioxide in a container according to a mole ratio of 1 to (0.5-2), adding the prepared sodium hydroxide solution into the container, transferring the solution to a reaction kettle, and reacting for 24-96 hours under the condition at the temperature of 170-300 DEG C; filtering the reacted mixture solution by pure water and drying the filter cake after filtering under the condition at the temperature of 50-100 DEG C to obtain the micro-nano hydroxyl magnesium silicate powder. According to the method, by virtue of precursor nanometer magnesia and nanosilicon dioxide, the micro-nano hydroxyl magnesium silicate is synthesized by a high-temperature hydrothermal method under the condition of a strong base; the thickness of hydroxyl magnesium silicate powder pieces is between 60 nanometers and 20 microns.

The invention discloses a method for recovering Ti, V, Mo and Si in a SCR (selective catalytic reduction) waste catalyst by combination of activation calcination and acid leaching. The method comprises the following steps: (1) performing pretreatment on the SCR waste catalyst; (2) performing high-temperature calcination for activation; (3) performing acid leaching to obtain white TiO2 powder; (4) performing evaporation and concentration on a leaching solution to obtain a white precipitate, namely H2MoO4; (5) adding NH3.H2O into the leaching solution to regulate pH to 8.0-9.0 to obtain a NH4VO3 precipitate; (6) adding ammonia water into the leaching solution to regulate the pH to 8.0-9.0, further adding MgCl2 to obtain MgSiO3 and enabling filtrate to enter a waste water recovery system. By the process disclosed by the invention, H2MoO4, NH4VO3, TiO2 and MgSiO3 are obtained by recovery. The method disclosed by the invention has the advantages of no discharge of harmful secondary pollutants, simple process, low recovery cost, very high economic and social benefits and feasibility of implementation.

The invention relates to a preparation method of a silicate nano hollow structure material, which comprises the following steps: (1) orderly adding 0.2 mol/L nitrate solution and 0.2 mol/L sodium silicate solution into mixed liquor of ethanol and polyethylene glycol to form a mixed solution, wherein the mixed solution respectively comprises 20-30 parts of ethanol, 2-3 parts of polyethylene glycol, 1 part of nitrate solution and 1-2 parts of sodium silicate solution in parts by volume; (2) adding NaOH solution into the mixed solution obtained in step (1), wherein the volume ratio of NaOH solution to nitrate solution is 1:0.03-0.2; and after conducting magnetic stirring, transferring the mixed solution to a hydrothermal kettle, reacting under the hydrothermal condition of 100-200 DEG C, filtering and drying to obtain the silicate nano hollow structure material. The obtained silicate hollow material can be used for heavy metal ion absorption, and can also be used in the fields of catalysis, medicines, environmental pollution treatment and the like.

A fluorescent substance contains M¹ (M¹ is: barium; barium and strontium; or barium and calcium), europium, magnesium, manganese, and silicon as essential components. The amount of the europium is 0.14 mol or smaller per mol of the silicon, and the amount of the manganese is 0.07 mol or smaller per mol of the silicon. The main crystals are a solid solution of europium and manganese in M¹₃MgSi₂O₈. When X-ray diffraction intensities for the M¹₃MgSi₂O₈ crystals, M¹₂MgSi₂O₇ crystals, M¹₂SiO₄ crystals, and M¹MgSiO₄ crystals are expressed by A, B, C, and D, respectively, then B/(A+B+C+D) is 0.1 or less, C/(A+B+C+D) is 0.1 or less, and D/(A+B+C+D) is 0.26 or less.

The invention discloses a recycling method of magnesium in the heavy magnesium water solution, which comprises the following steps: aerating air in the heat decomposing reactor bottom under indoor temperature; reducing partial pressure of carbon dioxide through extracting into vacuum; transmitting 80-90% magnesium bicarbonate in the heavy magnesium solution into the sediment of basic magnesium carbonate sediment; filtering; drying to obtain the basic magnesium carbonate; adding sodium silicate in the filtrate; reacting residual 10-20% magnesium bicarbonate and sodium silicate to obtain magnesium silicate; recycling magnesium in the heavy magnesium solution completely.

The invention discloses an alkaline aluminum extraction and dealkalized red mud obtaining method, which comprises the following steps: (1) raw materials including an aluminiferous raw material, a sodium oxide precursor, a magnesium oxide precursor and an optional calcium oxide precursor are prepared according to a raw material formula; (2) the raw materials are roasted at 800-1300 DEG C to obtain a sintered clinker; (3) the sintered clinker undergoes dissolution and solid-liquid separation to obtain red mud and a digested liquor; (4) the digested liquor undergoes desilicication and carbonating disintergration so as to obtain aluminium hydroxide; and (5) the red mud is dealkalized to obtain the dealkalized red mud containing magnesium silicate, wherein the raw material formula satisfies that molar ratio of the components oxides ([MgO]+[CaO])/([SiO2]+[TiO2]) is 0.9-1.1. The invention also discloses dealkalized red mud obtained by the above method and an application of the dealkalized red mud. By the method provided by the invention, high standard dissolution rate of aluminium oxide can be maintained, and added value of aluminum extraction is high.

The invention discloses a method for preparing highly pure magnesium hydroxide and magnesium hexa-silicate by using olivine tailing mine, which comprises the following steps: step one. olivine tailing mine and muriatic acid are blended, leached and reacts; step two. pickle liquor leached by acid is added into an enamel reactor and oxidized by adding oxidant hydrogen peroxide; step three. the component of a solid product after reaction is a ferric oxide which is washed and dried after solid-liquid separation to be iron oxide red; step four. filtrate after solid-liquid separation is continously added with ammonia water; step five. sizing agent containing magnesium hydroxide stays in reactant, aged, washed, dried and ground to obtain highly pure magnesium hydroxide; step six. solid leached by muriatic acid reacts with caustic soda to produce serous fluid containing sodium silicate; and step seven. reaction product which reacts with caustic soda solution is filtered and washed to obtain magnesium hexa-silicate. The method causes magnesium oxide to be fully recycled. The method ensures complete circulation of ammonia, increases yield of magnesium oxide in mineral, reduces the cost of magnesium hydroxide, and simultaneously ensures the purity of the magnesium hydroxide which reaches more than 99%.

The invention provides high surface area talc compositions by a novel hybrid milling method or soaking method. The hybrid milling method comprises dry milling talc powder followed by mixing with water and wet milling to provide a nano-talc slurry with high surface area, also of the invention. The soaking method comprises dry milling talc powder followed by mixing with water and soaking to provide high surface area nano-talc slurry. The slurry may be dewatered and dried to provide dry nano-talc powder. The nano-talc powder provided by the invention is a novel hydrophilic talc composition. Further embodiments of the invention include organic solvent dispersed nano-talc slurries and methods for providing the same. These slurries can be used to provide polymer nano-talc composites in the form of coatings, sealing and gasketing materials, foams, extruded thermoplastic and thermoset sheets and films, thermoplastic pellets, thermoplastic and thermoset molded polymer composite articles. Another embodiment is a polyurethane nano-talc composite article derived from the organic solvent dispersed slurries.

The invention relates to a magnesium silicate fiber blanket belonging to the technical field of fire-proof heat preservation and insulation materials. The magnesium silicate fiber blanket is characterized by comprising the following materials with oxides in percentage by weight: 40%-85% of SiO2, 3%-40% of MgO, 2%-30% of CaO, and the balance of one or the any combination of B2O3, Al2O3, Fe2O3, Na2O and K2O, wherein the total amount of the SiO2, the MgO and the CaO is more than or equal to 85%. The magnesium silicate fiber blanket is processed through the procedures of material melt, centrifugal thread throwing or blowing fiber forming, cotton collection, pinprick, heat treatment, cutting, and the like. The magnesium silicate fiber blanket has functions of non-inflammation, heat insulation, sound absorption and fire prevention and is a fire-resistant heat-preserving heat-insulating fire-proof material which is widely suitable for various heat engineering equipment and pipelines.

There is disclosed a ceramic structure which comprises a material having a controlled pore distribution and including cordierite as the main crystal phase. In the pore distribution, the volume of pores having pore diameters smaller than 20 μm accounts for 15% or less of the total pore volume, and the volume of pores having pore diameters of 20 to 100 μm accounts for 70% or more of the total pore volume. This ceramic structure is suitable for realizing a ceramic catalyst body which has excellent purification efficiency, is reduced in pressure loss, and is mountable even in a limited space.

The invention discloses a process for preparing ultra-fine calcinated talcum powder, wherein talcum is subject to calcinations, grinding, collection, drying and granulating. The grain size of the powder is between 3000-10000 meshes.

The invention discloses a method for purifying low-grade sepiolite. The method comprises the following steps: adding water and a dispersing agent into raw ore of sepiolite, and pulping under coactions of mechanical stirring, ultrasonic assistance and dispersion of the dispersing agent; obtaining sepiolite-enriched ore pulp through gravity settling; dehydrating, drying and grinding by using a vacuum filter, thereby obtaining a product. The method mainly aims to rapidly purify a sepiolite product under coactions of ultrasonic assistance and dispersion of the dispersing agent on the basis of a settling method. The method is simple in process, relatively short in preparation flow and preparation cycle, no other aids are needed except a small amount of the dispersing agent, ore pulp pollution is avoided, and later fine processing or secondary purification can be facilitated.

The invention relates to a method for preparing a composition, that is a talcose composition, comprising synthetic mineral particles which contain silicon, germanium and metal, have a crystalline and lamellar structure, and are of formula (SixGe1-x)4 M3O10(OH)2, wherein M is at least one divalent metal and is of formula Mgy(1)Coy(2)Zny(3)Cuy(4)Mny(5) Fey(6)Niy(7)Cry(8), and x is a real number of the interval [0; 1]. According to said method, a gel containing silicon, germanium and metal, of formula - (SixGe1-x)4M3O11, n'H2O -, in the liquid state, is subjected to a hydrothermal treatment over a defined period of time and at a temperature of between 300 DEG C and 600 DEG C, said time and temperature being selected according to the desired particle size and structural stability for the mineral particules containing silicon, germanium and metal, to be prepared.

Provided are solid-state electrolyte structures. The solid-state electrolyte structures are ion-conducting materials. The solid-state electrolyte structures may be formed by 3-D printing using 3-D printable compositions. 3-D printable compositions may include ion-conducting materials and at least one dispersant, a binder, a plasticizer, or a solvent or any combination of one or more dispersant, binder, plasticizer, or solvent. The solid-state electrolyte structures can be used in electrochemical devices.

The invention discloses a fibrous nano silicate concrete admixture. The fibrous nano silicate concrete admixture is a compound prepared by magnesium silicate and calcium silicate in a high molecular polymer dispersing agent water solution, wherein the magnesium silicate is prepared by soluble magnesium salt and soluble silicate according to the mole ratio of 1: 1.2 to 1: 1.6, the calcium silicate is prepared from soluble calcium salt and soluble silicate according to the mole ratio of 1: 1 to 1: 1.5, the soluble calcium salt is magnesium nitrate, the soluble calcium salt is calcium nitrate, the soluble silicate is sodium silicate, a high molecular polymer dispersing agent is shown by a formula shown in the description. The fibrous nano silicate concrete admixture can remarkably improve the early strength of concrete. In addition, the concrete toughness has an obvious improving effect, early hydration of cement can be accelerated, and improvement of bending resistance and tension resistance capability of a cement-based material is promoted.