7 results about "Fluorapatite" patented technology

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 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.

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 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.