9 results about "Silica Hydrate" patented technology

The present invention relates to the technical field of highly dispersed hydrated silica for silicone rubber, and in particular to a method for preparing hydrated silica that prevents particle agglomeration. During the reaction process, the present invention uses a silane hydrolyzate to effectively disperse and modify newly generated silica particles, effectively preventing particle agglomeration and greatly reducing the content of surface hydroxyl groups. At the same time, a high-speed stirring method is adopted to effectively solve the "local over-concentration" phenomenon of the reaction materials and greatly reduce the generation of gel. The step-by-step acidification technology makes the particle distribution more uniform. The addition of a dispersion modifier with specific components and proportions in the pulping process effectively reduces particle agglomeration during the drying process. Through the above technical means, the product indicators of the present invention are effectively reduced in DET / CTAB, surface hydroxyl content, ignition loss, DBP absorption value, particle size distribution width, etc. compared with existing hydrated silica products for silicone rubber, thereby greatly improving the dispersibility of the product in silicone rubber.

This invention relates to a silicon tetrafluoride gas absorption device for the production of hydrofluoric acid from fluorosilicic acid. The device includes a housing, within which is an absorption cylinder extending horizontally along its axis. One end of the absorption cylinder is fixedly connected to an inlet pipe, and the other end is rotatably mounted to a liquid inlet pipe via a bearing. The housing is equipped with a drive motor for rotating the inlet pipe and an inlet structure for introducing silicon tetrafluoride gas into the inlet pipe. The end of the liquid inlet pipe away from the absorption cylinder extends out of the housing and is sealed and fixedly connected to it. A suction pipe is located inside the liquid inlet pipe, with its inner end extending to the lower side of the absorption cylinder. The outer wall of the absorption cylinder has several filter holes, each hinged with a sealing cap. A torsion spring on the hinge shaft of the sealing cap keeps it sealed to the filter holes. The housing also includes a gas supply pipe and a gas extraction pipe. Compared to existing technologies, this invention offers better absorption of silicon tetrafluoride and better separation of silica hydrates.

Cement compositions including ordinary Portland cement, a secondary cementitious material (SCM) including one or more of pozzolan, metakaolin, limestone, or gypsum in an amount of up to approximately 70% of a replacement level of ordinary Portland cement, and between approximately 0.05% by weight of cement (bwoc) and 2% bwoc of aggregates of mesoporous carbon nanoparticles (3DG) carbons. The cement compositions regulate nucleation and time-lapsed growth of calcium silica hydrates during initial hydration. The 3DG carbons include aggregates of mesoporous carbon nanoparticles, which include one or more interconnected bundles of electrically conductive graphene layers. The 3DG carbons include oxygen containing functional groups disposed on one or more of the surfaces of the 3DG carbons or within the 3DG carbons.

The invention relates to a resource utilization and alkali liquor regeneration cycle method for silicon-rich alkali liquor in a two-step alkali-process aluminum extraction process of high-alumina fly ash. The method comprises the following steps: firstly, introducing a gas containing carbon dioxide into the silicon-rich alkali liquor, enabling silicate in the silicon-rich alkali liquor to react to generate a hydrated silicon dioxide precipitate, and then carrying out solid-liquid separation to obtain a hydrated silicon dioxide product and a sodium carbonate solution; adding calcium-based alkali into the sodium carbonate solution for reaction to generate a sodium hydroxide solution and calcium carbonate precipitate, and then performing solid-liquid separation to obtain a regenerated sodium hydroxide solution; and finally, returning the obtained regenerated sodium hydroxide solution for the pre-desilicication process of the high-alumina fly ash. According to the method, waste silicon resources are converted into high-value products, closed-loop circulation of the alkali liquor is achieved, the silicon recovery rate can reach 98% or above, the alkali regeneration efficiency exceeds 90%, the consumption of fresh alkali and discharge of alkali wastewater are remarkably reduced, and the overall economic benefits and environmental friendliness of the technology for extracting aluminum from high-alumina fly ash are improved.

A water-based thermal-insulation coating material includes a water-based resin, a film forming auxiliary agent, and a thermal insulation agent. The water-based resin is at least one material selected from a group consisting of: acrylic resins, polyurethane resins, epoxy resins, and combinations thereof. The water-based resin has a minimum film-forming temperature of not less than 5° C. The film forming auxiliary agent is at least one material selected from a group consisting of: plasticizers, alcohol-ether solvents, alcohol-ester solvents, a mixed solvent of ethylene glycol mono-butyl ether and di-propylene glycol butyl ether, aprotic solvents, and combinations thereof. The thermal insulation agent is hydrated silicon dioxide.

The invention discloses a resource recycling method of tailings of a quartz vein type lead-zinc mine, which comprises the following steps: grinding the tailings to-0.074 mm, putting the tailings, water and sodium hydroxide into a reaction kettle for heating and leaching at the leaching temperature of 220 DEG C, the reaction time of 120 minutes, the alkali residue mass ratio of 2: 1 and the liquid-solid ratio of 5: 1, carrying out solid-liquid separation to obtain leached residues and leached liquid, and recycling the leached residues and the leached liquid to obtain the quartz vein type lead-zinc mine tailings. And adding a certain amount of electrolyte sodium sulfate into the leachate, dropwise adding a prepared sulfuric acid solution at a certain stirring rate, controlling the pH value of the reaction endpoint, aging for a period of time at a constant temperature after the reaction is completed, filtering and repeatedly washing after the aging is completed, and finally drying a filter cake to obtain hydrated silicon dioxide, namely a white carbon black product. The product can meet the product requirements of the highest class A in the national standard GB / T10722. The technology of heating alkaline leaching and sulfuric acid precipitation is adopted, the technological process is short, the leaching rate of silicon dioxide is high, and a high-quality white carbon black product is obtained, so that recycling and reduction of a lead-zinc mine are achieved, and the development direction is pointed out for processing and utilization of high-silicon solid waste.

The present invention addresses the problem of providing a patch that has excellent skin permeability and good adhesiveness. [Solution] A patch provided with a support and an adhesive layer laminated on the support, the adhesive layer containing loxoprofen sodium hydrate, hydrated silica, polyisobutylene, glycerol ester of hydrogenated rosin, a styrene-isoprene-styrene block copolymer, and phosphoric acid. Based on the total mass of the adhesive layer, the content of the silicon dioxide hydrate is preferably 0.3%-1% by mass, the content of the polyisobutene is preferably 5%-15% by mass, the content of the glycerol ester of the hydrogenated rosin is preferably 10%-20% by mass, the content of the styrene-isoprene-styrene block copolymer is preferably 17%-27.5% by mass, and the content of the phosphoric acid is preferably 0.1%-1.5% by mass.

The invention discloses a non-toxic polyether defoaming agent and a preparation method thereof, and belongs to the technical field of polyether defoaming agent preparation. Mainly comprises the following raw materials in parts by mass: 70-80 parts of a polyether modified organosilicon surfactant, 15-25 parts of simethicone, 4-6 parts of hydrophobic fumed silica, 3-10 parts of an emulsifier, 2-6 parts of a thickener, 1-2 parts of an auxiliary agent and 60-80 parts of deionized water. The surface tension of an aqueous solution of an alkyl-modified organosilicon surfactant is lower, then hydrophobic-treated hydrated silicon dioxide, simethicone and a self-made organosilicon-modified polyether surfactant are compounded to prepare silicon paste, and then the silicon paste is mixed with an emulsifier, deionized water and a thickener to prepare the defoaming agent. Results of thermal stability, centrifugal stability, water dispersibility and practical application evaluation experiments of the defoaming agent show that the defoaming agent has good defoaming and foam inhibition performance, and hydrophobic groups in the defoaming agent can be increased due to the introduction of alkyl in the hydrogen-containing silicone oil.

The invention belongs to the technical field of silicon dioxide, and relates to high-viscosity hydrated silicon dioxide as well as a preparation method and application thereof. According to the method for improving the dynamic viscosity of the hydrated silicon dioxide by introducing a small amount of oily substances into the intergranular gaps of the silicon dioxide solid particles, due to the interaction with the surface, the oily substances obtain the properties of quasi-solid substances, and the intergranular interaction of the silicon dioxide in the field of low mechanical load is increased. In the process, the viscosity is increased by 2-3 orders of magnitude. As the mechanical load increases, the dynamic viscosity decreases due to partial disruption of the solid phase of the oil, which process occurs concurrently with internal recombination of the silica agglomerates and formation of a more compact heterogeneous system including the silica solid phase, water, oil and air adsorbed at the interphase boundaries.