14 results about "Apatite" patented technology

This invention relates to a method for preparing copper-modified lead apatite. The method includes: sequentially subjecting precursor materials to a first hydrothermal process and a second hydrothermal process, followed by calcination to obtain copper-modified lead apatite; the precursor materials include liquid-phase precursor materials or solid-phase precursor materials; the liquid-phase precursor material is obtained by mixing lead salt, copper salt, phosphorus source, pH adjuster, chelating agent, and solvent; the solid-phase precursor material is obtained by mixing copper compound and lead compound; the temperature of the first hydrothermal process is lower than the temperature of the second hydrothermal process. The preparation method provided by this invention, by treating rationally designed raw materials using a specific hydrothermal process, can obtain copper-modified lead apatite with extremely low impurity content, which is beneficial for broadening the application fields of copper-modified lead apatite and improving its performance.

This invention relates to the field of soil remediation and improvement technology, specifically disclosing a soil remediation and improvement agent for contaminated soil and its preparation method. The remediation and improvement agent comprises the following raw materials in parts by weight: modified remediation masterbatch, hydroxyapatite, sodium bentonite, mineral-derived potassium humate, and polyaspartic acid. The preparation method includes: firstly, using lignin to disperse and fix an iron source on biochar and zeolite to obtain a modified carrier; then, using a colloid formed from sodium alginate and silane, adhering modified lithium titanate and modified bismuth tungstate to the carrier surface, and then applying a low-temperature compound bacterial agent to obtain the modified remediation masterbatch; finally, mixing the masterbatch with other raw materials and granulating. The improver prepared by this invention utilizes the synergistic effect of multiple materials to simultaneously adsorb heavy metals and degrade organic pollutants, and the process is controllable, making it suitable for agricultural applications.

A method for recovery of rare earth elements from apatite mineral comprises dissolving (S10) of apatite mineral of magmatic origin in an acid comprising hydrochloric acid. The dissolving results in a first liquid solution comprising phosphate, calcium and chloride ions, rare earth elements, arsenic and iron. The arsenic and any ferric iron are removed. The first liquid solution is treated (S20) into a second liquid solution by extracting (S22) of a major part of the phosphate ions with an organic solvent. The treating of the first liquid solution into the second liquid solution further comprises partially neutralizing (S75) a raffinate resulting from the extracting of a major part of the phosphate to a pH > 1.5, causing precipitation of phosphates of rare earth elements, and filtering (S76) the precipitated phosphates of rare earth elements from the raffinate.

This invention discloses a flotation process for recovering apatite from iron ore tailings, belonging to the field of mineral processing technology. It includes the following steps: 1. High-gradient magnetic separation is applied to the iron ore tailings to recover and remove magnetic iron-bearing minerals. The removed iron-bearing minerals are returned to the main iron ore processing flow. The tailings enter a sluice to remove large gangue minerals, and then enter a thickener for concentration. 2. The underflow product from the thickener is subjected to sulfide mineral flotation and gypsum flotation to remove easily interfering impurities, followed by apatite collecting direct flotation to obtain apatite concentrate. 3. The apatite concentrate is subjected to ultrafine grinding for liberation and selective mudification of impurities, followed by closed-circuit apatite cleaning to obtain a qualified apatite concentrate product. This invention can achieve good recovery and utilization of apatite from iron ore tailings and has great economic feasibility.

The application provides a preparation method and application of a nanoscale porous hydroxyapatite material, and belongs to the field of inorganic material synthesis. The hydroxyapatite material with high crystallinity, nanoscale, microspherical morphology and multi-level pore structure of microporous and mesoporous is obtained through one reaction of a calcium source suspension liquid containing calcium acetylacetonate and a phosphorus solution containing a trisalt of phosphoric acid through a microchannel reactor, and then secondary crystallization through high-temperature calcination. The material particle size is 30-90nm, the pore size range is 0.5-50nm, heavy metal ion adsorption can be realized, the adsorption rate reaches more than 93.0% when the heavy metal ion concentration is 100-500mg / L, is 1.21 times of the adsorption rate of a hydroxyapatite material prepared by a simple chemical precipitation method, and has a wide application prospect in the field of heavy metal ion adsorption.

This invention discloses a method for predicting hydrocarbon charging based on the superposition of ancient and modern structures, comprising the following steps: Step 1: Outputting a current structural contour map and an uncertainty thermogram that combine spatial accuracy and uncertainty quantification; Step 2: Constructing a structural change index to quantify the destruction / preservation weights of each phase on the trap; Step 3: Integrating apatite fission track and (U-Th) / He thermochronological data to output a paleostructural contour map with error distribution and a paleoriver probability field; Step 4: Generating a three-dimensional volume of sand body probability distribution, coupling a digital core pore network model to simulate the critical threshold for hydrocarbon charging, and generating a sand body connectivity index map to constrain the distribution of high-quality reservoirs; Step 5: Superimposing multiple parameters in the superposition area of ​​ancient and modern structural high points, applying the SHAP algorithm to analyze the contribution of reservoir-controlling elements to focus on the main controlling factors and lock in favorable target areas for hydrocarbon enrichment; Step 6: Generating a three-dimensional probability volume of favorable target areas and combining it with an economic evaluation module to generate an exploration priority ranking.

The application discloses a method for synthesizing yttrium-containing carbonate apatite (Ca 5‑x Y x )[(PO4) 3‑x (CO3) 2x ]F at high temperature and high pressure. Analytically pure calcium phosphate Ca3(PO4)2 and analytically pure nano calcium fluoride CaF2 are mixed at a molar ratio of 3:1, uniformly ground and uniformly mixed, and a precursor undoped apatite Ca5(PO4)3F powder is obtained at high temperature. The undoped apatite, analytically pure calcium carbonate, analytically pure yttrium phosphate YPO4 and nano calcium fluoride are mixed according to a molar ratio of a reaction equation to prepare a sample, and a reaction is carried out at high temperature and high pressure, wherein a synthesis pressure is 3 GPa, a temperature is 1050-1100 DEG C, and a reaction time is 2 h. A white yttrium-containing carbonate apatite powder is obtained, no other impurities are contained, a crystal structure is monoclinic P63 / m, and with an increase of a doping amount x of yttrium, a crystal lattice parameter linearly increases, and the doping amount x of yttrium ranges from 0

This invention relates to the fields of oral medicine and nanomaterials, and particularly to a magneto-optical dual-response material, its preparation method, and its applications. The magneto-optical dual-response material comprises a magnetic response core, a biomimetic mineralization layer modified on the surface of the magnetic response core, and a photoresponsive outer layer modified on the surface of the biomimetic mineralization layer. The magnetic response core comprises superparamagnetic magnetite dendrites; the biomimetic mineralization layer comprises a hydroxyapatite nanocrystal array; and the photoresponsive outer layer comprises nanoenzymes. The magneto-optical dual-response material provided by this invention integrates magnetic targeting and mechanical removal of biofilms, near-infrared light synergistic sterilization, and biomimetic remineralization functions, aiming to overcome the passivity and limitations of existing technologies and achieve proactive, precise, and integrated prevention and treatment of early pit and fissure caries.

An inorganic material in a form of open-porosity particles, each of the particles comprising a lead vanadate or phosphovanadate of formula Pb3-xXx(VO4)2-2y(PO4)2y, wherein x=0 or x>0 but ≤0.33; y=0 or y>0 but <1; X=Ba2+, Ca2+, Sr2+ or Cd2+; and metallic lead or a lead salt. A method for preparing the material, a method for capturing iodine present in a gaseous effluent as well as a method for conditioning iodine present in a gaseous effluent in a form of an iodoapatite.

The present application belongs to the technical field of chemical electron probe testing, and particularly relates to an electron probe quantitative analysis method for testing apatite with a small beam spot. The method comprises sample pretreatment, determination of elements, line series and a spectrometer crystal, determination of standard samples, determination of acceleration voltage, determination of an analysis beam current and a beam spot, determination of peak position counting time, monitoring of sample testing, and apatite sample testing. The present application can effectively analyze apatites of small particles such as broken apatite particles in meteorites and apatite particles in mineral inclusions. The present application compares test results under different acceleration voltages and analysis beam currents to ensure that the sample is not damaged during testing, and the optimal test conditions are obtained to ensure the correctness of the test results.