5 results about "Silica Hydrate" patented technology

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.

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 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.