13 results about "Fluorapatite" patented technology

The invention discloses a process and equipment for synthesizing fluorapatite from wastewater, the equipment comprises a blending tank, a dispensing tank, a crystallization fluidized bed reactor, a reaction tank, a coagulation tank, a flocculation tank, a sedimentation tank, a pH detection device, a lift pump and a control system, fluorine-containing sewage and phosphorus-containing sewage are mixed in the blending tank, so that the molar ratio of fluorine to phosphorus is 0.34-0.4; the method comprises the following steps: adding fluorapatite into a reaction tank, adjusting the pH value to 7.5-8.5, pumping the fluorapatite and lime slurry into a crystallization fluidized bed reactor according to a calcium-phosphorus molar ratio of (3-3.5): 1, carrying out a crystallization reaction, naturally airing the generated fluorapatite crystals, carrying out a reaction on crystallization treatment water and the lime slurry in the reaction tank to remove fluorine and phosphorus, carrying out coagulation, flocculation and precipitation treatment, and discharging the effluent after reaching the standard. The high-quality fluorapatite product is prepared from the fluorine-containing sewage and the phosphorus-containing sewage, so that the preparation cost is low, and resourceful treatment of the fluorine-containing sewage and the phosphorus-containing sewage is realized.

The application belongs to the technical field of phosphogypsum resource utilization, and particularly relates to a method for directionally recovering fluorapatite from phosphogypsum leaching solution. The method comprises the following steps: performing rough filtration and flocculation pretreatment on the phosphogypsum leaching solution to remove suspended solid matters; then adding an alkaline precipitant to adjust the pH to 6-12 to remove precipitates; then adding a Ca source according to a Ca:P:F molar ratio of (4.8-5.2):(2.8-3.2):(0.8-1.2), or simultaneously adding the Ca source and a P or F source, adjusting the pH to a favorable crystallization interval of 7-9, introducing fluorapatite crystal seeds to stir and crystallize or to stir and crystallize by cooling, and performing solid-liquid separation, so that the obtained solid phase is Ca5(PO4)3F. Through specific synergistic regulation, conditioning, adjustment and induced crystallization process, the method can directionally recover high-purity fluorapatite from the phosphogypsum leaching solution.

The application provides a fluorapatite phosphate ore reverse flotation magnesium removal collector and application thereof, which comprises basic substances and water, and the basic substances are mixed according to the mass ratio, wherein the ratio of fatty acid soap, surfactant and additive is 11:3:2; the fatty acid soap is one or a mixture of two of sodium oleate, oxidized paraffin soap; the surfactant is one or any ratio of sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, sodium citrate, sodium acetate and sodium benzoate; and the additive is sodium naphthenate. The fluorapatite phosphate ore reverse flotation magnesium removal collector provided by the application can effectively separate apatite and dolomite, significantly improve the collecting capacity and selectivity by adding surfactants and additives, and the surfactant composition weakens the influence of Fe 3+ on the flotation system.

The invention belongs to the technical field of ardealite resource utilization, and particularly relates to a method for recycling fluorapatite from ardealite leacheate through ion activity control. The method comprises the following steps: carrying out on-line detection on a fluorapatite saturation index on a phosphogypsum leacheate stock solution, and adjusting the supplementing amount of a Ca source / a P source / an F source in real time to keep a system supersaturated; adding background electrolyte, a complexing agent and a crystal face regulating agent into the treated solution to obtain a crystal precursor solution; controlling the temperature to be 50-90 DEG C, adjusting the pH value of the system to be 6.4-6.9, supplementing Ca < 2 + >, adding FA seed crystal, and uniformly stirring and mixing; the temperature is increased to 70-95 DEG C, the pH is increased to 6.8-7.8, a surface rearrangement accelerant is added for directional crystallization and solid-liquid separation, a solid product is washed and dried, and fluorapatite is obtained. FA crystal nucleation is controlled and regulated through ion activity, so that the yield and the purity of a target product are remarkably improved.

This invention provides a dental enamel veneer restorative material and its preparation method, belonging to the technical field of ceramic molding products. To further improve the adhesion of dental veneer materials, reduce the amount of tooth structure removed, and decrease the risk of chipping and detachment, this invention uses zirconium oxide, alumina, hydroxyapatite, dimethylsilylated silica, silicon dioxide, fluorapatite, magnesium oxide, thermosetting acrylic resin, aluminum hydroxide gel, silane coupling agent, polyvinyl alcohol, and sodium inositol hexaphosphate as raw materials. These components are combined in specific proportions, and a special process is used to prepare the dental veneers. While ensuring good biocompatibility, high hardness, and wear resistance, this invention further improves adhesion, reduces the amount of tooth structure removed, decreases the risk of chipping and detachment, extends service life, and provides a better user experience.

The invention discloses a tooth whitening strip and a preparation method, and relates to the technical field of oral care. According to the invention, the two key components, namely the adhesive and the desensitization protective agent, of the tooth paste are respectively designed and the synergistic effect of the adhesive and the desensitization protective agent is fully exerted, so that on one hand, the adhesion of the gel layer of the wet tooth paste on the tooth surface and the toughness of the tooth paste are improved, and the gel layer is not easy to fall off or break or remain on the tooth surface; on the other hand, calcium ions, phosphate ions and fluorine ions released by the desensitization protective agent promote generation of acid-resistant fluorapatite and induce remineralization on the enamel surface, and microscopic damage is repaired; and a cross-linked network formed by the adhesive in a gel layer matrix is beneficial to enriching the ions and leading the ions to a to-be-repaired part quickly. The tooth whitening paste can better protect and repair the tooth surface while playing a whitening role, and better oral care experience is provided for a user.

The application discloses europium-doped apatite-based red fluorescent powder and a preparation method thereof, and relates to the technical field of luminescent materials. 10‑x (PO4)6F2:xEu 3+ ; wherein x is Eu 3+ doping substitution Ca 2+ , and the molar ratio of Eu 3+ is 0.02<=x<=0.2. The preparation method mainly uses a calcium source, a fluorine source, a phosphate, and an Eu 3+ containing compound as raw materials, and the fluorescent powder can be obtained through hydrothermal heating at a temperature of 150-250 DEG C, cleaning and drying. The prepared fluorescent powder shows strong narrow-band red emission under excitation of ultraviolet light of 390 nm, the emission wavelength ranges from 579 nm to 696 nm, and the main peak is at 618 nm; the color temperature is 2138.74 K, and the color coordinates are about (0.5896, 0.3385), so the prepared fluorescent powder can be used as a red fluorescent powder with relatively good thermal stability. The preparation process is simple, green and environmentally friendly, and is convenient for large-scale production.

This invention relates to the field of ceramic materials technology, and discloses an impact-resistant composite ceramic material, its preparation method, and its application. The preparation method of the impact-resistant composite ceramic material includes the following steps: mixing potassium feldspar, quartz, kaolin, wollastonite, bentonite, calcium silicate, talc, alumina, and reduced-treated composite modified zirconium oxide powder to obtain a green body material; mixing potassium feldspar, sodium feldspar, quartz sand, calcite, dolomite, kaolin, talc, fluorapatite, alumina, zinc powder, and silicon carbide whiskers to obtain a mixture, which is then ball-milled and sieved to obtain a glaze slurry; forming the green body material into a ceramic green body matrix; applying the glaze slurry onto the ceramic green body matrix, and sintering in stages to obtain the impact-resistant composite ceramic material. The impact-resistant composite ceramic material of this invention has excellent gloss and aesthetics, and also exhibits excellent impact resistance and thermal shock resistance.

The invention relates to the technical field of ceramics, in particular to a light-variable antique glazed tile and a preparation process thereof, and aims to solve the problems that an existing antique glazed tile is uneven in aging effect, raw material tradition and practicability are difficult to balance, and blank glaze matching is poor. The glazed tile comprises a green body and a composite glaze layer covering the surface of the green body, wherein the composite glaze layer is of a double-layer structure of base glaze and dark fringe functional glaze; the base glaze is based on porcelain clay, potassium feldspar and modified quartz, and mixed plant ash and the like are added; the dark fringe functional glaze takes tungsten oxide and fluorapatite as cores, and wollastonite short fibers and the like are added. The preparation process comprises the steps of green body pretreatment, composite glaze preparation, gradient glazing and segmented temperature control sintering. Natural aging can be achieved in a short time, the warm and moist feeling of a traditional glaze surface is reserved, the blank glaze matching performance and the glaze layer durability are improved, cost is reduced, and the method is suitable for ancient building repair and pseudo-classic buildings.

The application belongs to the technical field of phosphogypsum resource utilization, and particularly relates to a method for recovering fluorapatite from phosphogypsum leaching solution by ion activity control. The method comprises the following steps: on-line detection of fluorapatite saturation index of phosphogypsum leaching solution original solution, real-time adjustment of Ca source / P source / F source supplementing amount to keep the system supersaturated; addition of background electrolyte, complexing agent and crystal face control agent in the above-processed solution to obtain a crystallization precursor solution; control of temperature to 50-90 DEG C, adjustment of system pH to 6.4-6.9, supplementing of Ca 2+ and addition of FA crystal seeds to stir and mix uniformly; increase of temperature to 70-95 DEG C and increase of pH to 6.8-7.8, addition of surface rearrangement promoter for directional crystallization, solid-liquid separation, washing and drying of the solid product to obtain fluorapatite. The application controls and regulates FA crystal nucleation through ion activity control, thereby significantly improving the yield and purity of the target product.

The application discloses a tooth appliance with a surface-modified antibacterial composite coating and a preparation method thereof. The tooth appliance with the surface-modified antibacterial composite coating is prepared by the following steps: preheating a Tris·HCl solution, adding minocycline hydrochloride into the solution, adjusting the pH of the solution, adding dopamine hydrochloride into the solution to obtain a mixed solution, immersing a pretreated tooth appliance in the mixed solution under stirring, taking out the tooth appliance, washing and drying the tooth appliance, and obtaining the tooth appliance with a polydopamine coating loaded with minocycline. The tooth appliance is placed in 1.5 times of a simulated body fluid with fluorine ions, immersed in a constant-temperature shaking table, washed with deionized water, and dried to obtain the tooth appliance with a composite coating composed of polydopamine and fluorapatite and loaded with minocycline. The tooth appliance with the modified coating has excellent antibacterial performance in a simulated oral environment, and can reduce the adhesion amount of bacterial biofilm and inhibit the proliferation of bacterial biofilm.

The invention discloses a treatment method of high-fluorine silicon-containing waste acid, and belongs to the technical field of industrial wastewater treatment and resource recovery. According to the method, aluminum salt is preferentially added to precipitate silicon under the condition that the pH value is 2.5-4.0, calcium salt and phosphate are added to co-precipitate fluorine under the condition that the pH value is 6-8, fluorapatite is generated, deep purification can be further combined with an adsorption column, the removal efficiency of fluorine and silicon is remarkably improved, the sedimentation and separation performance of precipitates is improved, and the method is suitable for industrial production. Meanwhile, resource recycling of silicon and fluorine in the form of aluminosilicate and fluorapatite is achieved, and the comprehensive advantages of being simple in process, thorough in treatment and high in recycling value are achieved.

Efficiently reduces fluorine in fluorine-containing wastewater. [Solution] A method for treating wastewater containing fluorine, comprising the steps of: adjusting the pH of the wastewater containing fluorine to 10-11; adding a phosphate-based agent to the wastewater whose pH has been adjusted; and adjusting the pH of the wastewater to which the phosphate-based agent has been added to 10-11 and removing the fluorine in the wastewater as fluoroapatite.