8 results about "Calcium Phosphate Crystals" patented technology

The invention discloses a grading reaction crystallization recovery process and system for semiconductor fluorine-containing and phosphorus-containing waste liquid, the fluorine-containing and phosphorus-containing waste liquid and a lime solution react in a fluorine recovery crystallization reactor under the condition that the pH is 3-4 to form calcium fluoride crystals, and the calcium fluoride crystals are dehydrated to obtain calcium fluoride particle crystal products; the effluent of the fluorine recovery crystallization reactor, the calcium fluoride crystal dehydration filtrate, the lime solution and the calcium chloride solution react in a secondary reaction tank under the condition that the pH is 5-6, and calcium fluoride, fluorapatite, silicon dioxide and silicon-aluminum precipitates are removed through coagulation, flocculation and precipitation; effluent of the second-stage reaction tank, the lime solution and the calcium chloride solution react in the phosphorus recovery crystallization reactor under the condition that the pH is 7-8 to generate hydroxyapatite crystals, and the hydroxyapatite crystals are dehydrated to obtain hydroxyl calcium phosphate particle crystal products. Meanwhile, a high-purity calcium fluoride crystal product and a hydroxyl calcium phosphate crystal product are produced, and fluorine and phosphorus are recycled.

A method for producing calcium phosphate crystals according to the present invention comprises a step (S11) for preparing a weakly basic phosphoric acid solution containing a complex comprising a rare earth element ion and a coordination compound having a ligand coordinated to the rare earth element ion and a step (S12) for adding a calcium-containing compound to the weakly basic phosphoric acid solution and hydrolyzing. Some of the plurality of calcium ions contained in the structure of the calcium phosphate crystals are substituted by the rare earth element ion.

The present disclosure relates to a calcium phosphate coating that includes a plurality of nanometer sized calcium phosphate crystals that form a single layer. The coating is on a surface of a conductive substrate and is about 1 to 1000 nanometers thick, and greater than 25 percent of the coated surface area comprises the single layer of the crystals.

The invention discloses a method and device for improving phosphorus recovery of CaP crystals in sewage by using microbubbles, and the method comprises the following steps: adjusting the pH value of phosphorus-containing sewage to be alkaline, mixing the phosphorus-containing sewage with calcium salt, entering a nucleation reaction zone to obtain sewage containing calcium phosphate microcrystals, and enabling the sewage to flow into an air flotation zone after passing through a flow guide zone; high-pressure dissolved air water in the pressure dissolved air tank is pumped into a perforated pipe at the bottom of the air flotation area, and the perforated pipe releases the high-pressure dissolved air water to generate microbubbles; calcium phosphate microcrystals and microbubbles in the sewage in the air floatation area are flocculated into clusters and float upwards into the scum area; the calcium phosphate microcrystals in the scum area are agglomerated and cured under the shearing action caused by stirring and breaking of the microbubbles to obtain calcium phosphate crystals with the target particle size, and the calcium phosphate crystals are scraped into a scum tank by a scum scraper to realize phosphorus recovery; residual sewage after phosphorus recovery is discharged through a water outlet in the bottom of the air flotation area. The recovery method is simple to operate, and the recovered calcium phosphate crystals are controllable in particle size and high in recovery rate.

The application provides a stent weaving method and a stent woven by the method, the bending performance of the stent is better by improving the weaving method of the existing stent, adopting a spiral downward weaving method, and only one row of cross points between two rows of hook points. The application also improves the performance of the nickel-titanium shape memory alloy, the surface of the nickel-titanium shape memory alloy is coated with a calcium phosphate crystal film, and then a composite coating is coated, the microcrystalline layer of the application is uniformly distributed, the composite coating has high compatibility, and through the synergistic effect, the mechanical stability and the heat insulation effect of the nickel-titanium shape memory alloy are improved. The comprehensive performance of the stent prepared by improving the weaving method and the weaving material is significantly improved.

This invention relates to the field of dental restoration technology, providing a glucose solution-stabilized calcium phosphate ion cluster, its preparation method, and its application. The invention utilizes a glucose solution to stabilize calcium phosphate ion clusters. In a high-concentration glucose aqueous solution, calcium ions and phosphate groups aggregate to form ion clusters. Upon contact with saliva, the glucose dissolves, releasing the calcium phosphate ion clusters, which then attach to the enamel prism structure of the tooth, triggering a mineralization reaction. This promotes the deposition and growth of calcium phosphate crystals along a specific orientation, restoring the original morphology of the tooth and improving the strength and hardness of the enamel. Furthermore, the glucose solution used in this invention stabilizes the calcium phosphate ion clusters, resulting in clusters with a size <2 nm, allowing them to penetrate nanoscale demineralization pores and easily penetrate enamel micropores. This results in high mineralization efficiency, high enamel restoration strength, and the mineralization process does not require high temperature, high pressure, or ultraviolet irradiation, exhibiting good biosafety and high clinical translation feasibility, thus possessing broad application prospects in the field of dental restoration.

The application relates to the technical field of tooth enamel repair, and discloses a tooth enamel remineralization repair gel based on bioactive glass, which comprises choline chloride, urea, anhydrous disodium hydrogen phosphate, anhydrous sodium citrate powder, 45S5 type bioactive glass, sodium alginate powder and urease freeze-dried powder. In preparation, the powder components are dispersed in anhydrous eutectic solvent synthesized by choline chloride and urea. The application cuts off the precipitation path of calcium ions in the storage period by using the anhydrous matrix, triggers in-situ crosslinking of sodium alginate and calcium ions to form a film after coating, and effectively resists fluid scouring. In the limited space formed by the gel, urea is catalyzed by urease to produce ammonia to promote nucleation, and meanwhile, the micronized citrate root preferentially dissolves and is adsorbed on the calcium phosphate crystal nucleus surface to guide directional crystallization. The application avoids disordered precipitation of calcium and phosphorus ions, and can reconstruct a dense biomimetic crystal column repair layer with excellent mechanical hardness on the demineralized tooth surface.

This invention discloses a calcium silicate-calcium phosphate crystalline phase composite material and its applications. The calcium silicate-calcium phosphate crystalline phase composite material is prepared by preparation method A or preparation method B. Preparation method A includes: obtaining a mixed system containing tetraethyl silicate, ethanol, and water; adjusting the pH of the mixed system to 1-2 with acid; adding calcium salt to obtain a first component; obtaining a mixed system containing phosphate, calcium salt, and water to obtain a second component; mixing the first and second components evenly, stirring at 50-80°C, drying at 110-130°C for 11-13 hours, sintering, cooling, mixing with ethanol, grinding, and sieving to obtain the calcium silicate-calcium phosphate crystalline phase composite material. This calcium silicate-calcium phosphate crystalline phase composite material is a milder active composition that can be applied in the fields of oral care, cosmetics, and skin and mucous membrane repair.