18 results about "Calcium fluorophosphate" patented technology

The invention provides a method for softening sewage and synchronously removing fluorine, which comprises the following steps: detecting the concentration of calcium ions and the concentration of fluorine ions in high-calcium and high-fluorine wastewater, and adjusting the pH value of the high-calcium and high-fluorine wastewater to 6.5-8.0; adjusting the temperature of the high-calcium high-fluorine wastewater to 25-35 DEG C; dihydric phosphate is added into the mixture; wherein the molar weight ratio of PO4 < 3-> to calcium ions is 3: 5; meanwhile, the molar weight ratio of PO4 < 3-> to fluorine ions is 3: 1. According to the method for softening sewage and synchronously removing fluorine, a chemical precipitation method is adopted, a dihydric phosphate agent is accurately added into high-calcium and high-fluorine wastewater, and calcium fluorophosphate precipitate is generated through a chemical reaction, so that the aim of synchronously removing calcium ions and fluorine ions is achieved, and the dual effects of softening sewage and removing fluorine are achieved.

A method for full-chain integrated recovery of iron-aluminum slag produced during battery recycling. The method comprises the following steps: (1) mixing iron-aluminum slag with water, carrying out pressurized leaching with water, so as to obtain water leaching residues and a water leachate, and using water to wash the water leaching residues, so as to obtain a lithium-rich solution; (2) evaporating and concentrating the lithium-rich solution, then carrying out low-temperature crystallization, performing solid-liquid separation to obtain sodium sulfate crystals and a lithium precipitation mother liquor, mixing the lithium precipitation mother liquor with sodium carbonate and performing solid-liquid separation to obtain lithium carbonate; (3) mixing the water leaching residues with the mother liquor, carrying out pressurized alkali leaching and performing solid-liquid separation to obtain alkali-leaching residues and a leachate of alkali leaching; and (4) mixing the leachate of alkali leaching with an impurity remover, and performing solid-liquid separation to obtain calcium fluorophosphate impurity precipitate and an impurity-removed purified solution, and crystallizing the impurity-removed purified solution, so as to obtain aluminum hydroxide crystals and a mother liquor for recycling. Pressurized leaching of iron-aluminum slag generated during battery recycling achieves comprehensive resource utilization of the hazardous solid waste iron-aluminum slag.

The invention belongs to the technical field of sewage treatment, and particularly relates to a method for softening sewage through co-crystallization. The method for softening the sewage through co-crystallization comprises the following steps: adding a medicament into the sewage to be softened to enable substances to be removed in the sewage to be in a supersaturated state, then adding seed crystals into the sewage, and mixing and filtering. The method for softening the sewage through co-crystallization has the beneficial effects that according to the method for softening the sewage through co-crystallization, the removal object is in a supersaturated state by adding the agent, calcium fluoride or calcium fluorophosphate crystals are generated on the surface of the seed crystal in a heterogeneous crystallization mode under the action of external power, and the purpose of removing the fluorine ion concentration in the water is achieved.

The application relates to the technical field of sensors, and particularly discloses a magnesium-based metal ceramic sensitive element for a breathing pump and a preparation method thereof. The sensitive element is prepared by sintering a magnesium-based metal ceramic composition, and the raw materials include a magnesium-zinc-calcium medical magnesium alloy matrix phase, a dual-phase ceramic functional phase compounded by fluorophosphate calcium and magnesium boride, a low-temperature sintering fluxing compatible phase compounded by lithium fluoride and calcium fluoride, a potassium fluozirconate interface bridging modification component and a high-purity indium conductive stabilization component. The sensitive element is prepared through inert atmosphere raw material mixing, drying, powder pre-activation, cold isostatic pressing, double sealing and protection, stepwise low-temperature pulse discharge sintering, forming processing, surface passivation and working condition pre-stabilization treatment. The sensitive element is suitable for medical breathing pump sensing, has good conductivity, creep resistance and biocompatibility, and is suitable for high-frequency alternating working conditions; the preparation method is controllable, can realize low-temperature densification sintering, and guarantees the stability of the element structure and performance.

The application belongs to the field of industrial wastewater, and particularly relates to a double-layer filler calcium fluorophosphate crystallization deep fluorine removal system and a method thereof. The mixing distribution area of the fluidized bed system is provided with a water inlet pipe, the water inlet pipe is respectively provided with a first dosing pipe and a second dosing pipe, and the dosing pipes are connected with the water inlet pipe through a pipeline mixer. The first dosing pipe adds phosphates and inorganic acid, and the second dosing pipe adds calcium salt. Industrial fluorine-containing wastewater enters the mixing distribution area, the reagent in the first dosing pipe makes the pH value of the wastewater acidic, avoiding pipeline blockage; then the wastewater enters the pH adjusting area and contacts with the first layer of filler, the pH value of the wastewater changes to neutral to alkaline; then the wastewater enters the induced crystallization area, the fluorine ions in the wastewater generate calcium fluorophosphate crystals with the phosphates and the calcium salt on the surface of the filler, realizing efficient fluorine removal. Through the principle of acidic pH in the mixing distribution area and neutral to alkaline pH in the induced crystallization area, the application guarantees smooth water inlet and deep fluorine removal of the wastewater.

The present invention relates to improved phosphopeptide stabilised amorphous calcium phosphate and / or amorphous calcium fluoride phosphate complexes and compositions containing those complexes. Methods of making the complexes of the invention and of treating or preventing oral conditions are also provided. In one aspect, the present invention provides a composition comprising equal to or greater than about 8% w / v stannous associated phosphopeptide (PP) stabilized amorphous calcium phosphate (ACP) or amorphous calcium fluoride phosphate (ACFP) complexes wherein the complexes have a stannous ion content of equal to, or greater than, 1 mole of stannous per mole of PP but less than 4 moles of stannous per mole of PP.

The application provides a method for electrically strengthening recovery of phosphorus and fluorine in phosphogypsum, and belongs to the technical field of harmless treatment of phosphogypsum. In the method, the phosphogypsum is placed in a self-made electric treatment device, and strong acid salt or weak acid salt or water is used as an electrolyte; under the action of a low-voltage direct current electric field, phosphate ions and fluorine ions migrate into an anode chamber, and heavy metal cations migrate into a cathode chamber. The phosphorus and fluorine in the phosphogypsum are converted and directionally moved in the electric process, and then are enriched and recovered. Through the electric strengthening treatment of the phosphogypsum, the phosphorus and fluorine resources in the phosphogypsum are enriched and recovered, high-value calcium fluoride, calcium fluorophosphate and other products are obtained, high-value utilization of the phosphorus and fluorine is realized; meanwhile, the content of impurities such as Ti, Sr, P, Fe, Cr, Ba, Al and F in the phosphogypsum is reduced, and the harmless production of the phosphogypsum is realized.

According to the invention, a preparation is described which contains at least one calcium compound selected from the group consisting of calcium phosphates, calcium fluorides and calcium fluorophosphates and hydroxyl derivatives and carbonate derivatives of these calcium salts, calcium hydroxides and calcium oxides precipitated using at least one protein component selected from proteins and protein hydrolysates, and at least one crosslinking agent for the protein component and / or non-set cement.

The invention discloses a method for coating a nickel cobalt lithium manganate positive electrode material with calcium fluorophosphate, and belongs to the technical field of lithium batteries. According to the technical scheme, the method comprises the following steps: (1) providing a nickel cobalt lithium manganate positive electrode material, (2) stirring a lanthanum source and a titanium source in an alcohol solvent to form sol, then adding the nickel cobalt lithium manganate positive electrode material into the sol system, stirring for 1-8 hours at room temperature, then carrying out evaporation and vacuum drying, and then carrying out heat treatment for 1-6 hours at 300-600 DEG C in a muffle furnace to obtain the lithium ion battery positive electrode material. And finally obtaining the lanthanum-titanium composite oxide coated nickel cobalt lithium manganate positive electrode material. The lithium vanadium phosphate can provide good ion transmission performance, the carbon material can provide good electron transmission performance, the ionic conductivity and the electron conductivity of the single-crystal-morphology lithium nickel cobalt manganese oxide material can be effectively improved through organic combination of the lithium vanadium phosphate and the carbon material, and the chemical activity of the material is improved; therefore, the gram volume and the rate capability of the single-crystal nickel cobalt lithium manganate positive electrode material are greatly improved.

The invention belongs to the field of industrial wastewater, and particularly relates to a double-layer filler calcium fluorophosphate crystallization deep defluorination system and a method thereof.The mixing distribution area of a fluidized bed system is provided with a water inlet pipe, the water inlet pipe is provided with a first dosing pipe and a second dosing pipe, and the dosing pipes are connected with the water inlet pipe through a pipeline mixer; phosphate and inorganic acid are added into the first dosing pipe, and calcium salt is added into the second dosing pipe. The industrial fluorine-containing wastewater enters the mixing distribution area, and the pH value of the wastewater is acidic by virtue of an agent in the first dosing pipe, so that pipeline blockage is avoided; then the wastewater enters a pH adjusting area to be in contact with the first layer of filler, and the pH value of the wastewater is changed into neutral to alkaline; then the wastewater enters an induced crystallization area, fluorine ions in the wastewater, phosphate and calcium salt generate calcium fluorophosphate crystals on the surface of the filler, and efficient fluorine removal is achieved. According to the principle that the pH of the mixing distribution area is acidic and the pH of the induced crystallization area is neutral to alkaline, water inflow is smooth and not prone to blockage, and deep fluorine removal of wastewater is achieved.

A method for recovering iron-aluminum slag generated in battery recycling, the method comprising the following steps: (1) mixing the iron-aluminum slag with water, obtaining water leaching residue and water leaching solution by pressurized water leaching, and washing the water leaching residue with water to obtain a lithium-rich solution; (2) low-temperature crystallization after evaporation and concentration of the lithium-rich solution, and solid-liquid separation to obtain sodium sulfate crystals and lithium precipitation mother liquor, mixing the lithium precipitation mother liquor with sodium carbonate, and solid-liquid separation to obtain lithium carbonate; (3) mixing the water leaching residue with the mother liquor, and obtaining alkali leaching residue and alkali leaching solution by pressurized alkali leaching and solid-liquid separation; (4) mixing the alkali leaching solution with a decontamination agent, and obtaining calcium fluorophosphate impurity precipitate and decontamination liquor by solid-liquid separation, and obtaining aluminum hydroxide crystals and circulating mother liquor by crystallization treatment of the decontamination liquor. The iron-aluminum slag generated in the battery recycling process is treated by pressurized leaching, realizing the comprehensive utilization of hazardous solid waste iron-aluminum slag.

The invention belongs to the technical field of sewage treatment, and particularly relates to a method for removing calcium ions in sewage through multistage crystallization. The method for removing calcium ions in sewage through multi-stage crystallization comprises the following steps: sequentially adding calcium sulfate seed crystals, calcium fluorophosphate seed crystals and sodium carbonate seed crystals into sewage, and carrying out induced crystallization and precipitation. The method for removing the calcium ions in the sewage through multistage crystallization has the beneficial effects that the calcium sulfate seed crystal, the calcium fluorophosphate seed crystal and the sodium carbonate seed crystal are sequentially added into the sewage to achieve the purpose of removing the calcium ions in the water, and the removal rate of the calcium ions can reach 98% or above; and the content of fluorine ions and sulfate ions in water can be reduced at the same time. The method is simple in process and low in cost.

The invention provides a high-fluorine sewage treatment method and application, and relates to the technical field of crossing of sewage treatment and waste recycling. Specifically, low-concentration waste acid water generated in titanium dioxide production through a sulfuric acid method is used as an acidic medium, phosphorite is used as a calcium and phosphorus source, an acidic reaction solution containing soluble phosphate is prepared through a dissolution reaction, then the acidic reaction solution is mixed with high-fluorine sewage, then two-stage pH regulation and control are carried out to realize re-precipitation of calcium fluorophosphate, and the calcium fluorophosphate is obtained. And finally, high-fluorine sewage removal and waste acid water resource utilization are completed. According to the method, the circular economy target of treating waste with waste is achieved through calcium fluorophosphate dissolution-reprecipitation balance and accurate control over technological parameters, the fluorine removal efficiency is stabilized to be 94% or above, the concentration of fluorine in effluent is smaller than or equal to 10 mg / L, remarkable economic and environmental benefits are achieved, and the method is suitable for large-scale industrial application.

The present application belongs to the technical field of fluorine-containing water treatment, and relates to a regulation method and a regulation system for defluorination of fluorine-containing underground water. The regulation method comprises the following steps: obtaining the fluorine ion concentration, alkalinity and magnesium ion concentration of the actual fluorine-containing underground water; preparing simulated fluorine-containing underground water and a phosphoric acid solution, first making the fluorine concentration of the simulated fluorine-containing water same as the fluorine ion concentration of the actual fluorine-containing underground water; then continuously increasing the alkalinity of the simulated fluorine-containing water until the alkalinity of the simulated fluorine-containing water is same as the alkalinity of the actual fluorine-containing underground water, and adding an acid agent into the phosphoric acid solution; on the basis of the alkalinity reaching the alkalinity of the actual fluorine-containing underground water, adding magnesium salt into the simulated fluorine-containing water so that the magnesium ion concentration of the simulated fluorine-containing water is same as the magnesium ion concentration of the actual fluorine-containing underground water; then, replacing the simulated fluorine-containing water with the actual fluorine-containing water, so that the fluorine concentration of the effluent can be reduced to below 1.0 mg / L. The problem that the fluorine calcium phosphate precipitation reaction is invalid when the fluorine calcium phosphate precipitation method is used to treat the actual fluorine-containing underground water is solved.

The application patent belongs to the technical field of water treatment, and particularly relates to an integrated fluorine removal method and system based on a fluidized bed. The method comprises the following steps: delivering fluorine-containing wastewater to an inner fluidized bed bed body provided with fluorite seeds, and inputting a composite calcium salt crystallization agent in the inner fluidized bed bed body to induce crystallization to generate fluorite and perform primary fluorine removal; delivering the wastewater after the primary fluorine removal to an outer fluidized bed bed body provided with fluorapatite modified calcite seeds, and inputting di-potassium hydrogen phosphate and sodium hydroxide in the outer fluidized bed bed body to perform secondary fluorine removal; delivering the wastewater after the secondary fluorine removal to a water outlet collection tank after being treated by a porous adsorption filler, and the water outlet collection tank is communicated with a hydrochloric acid storage tank. The fluorine removal method and system combine high-concentration fluorine-containing wastewater fluorine removal and deep fluorine removal into integration, and can effectively improve the wastewater treatment effect.

The invention discloses a wastewater fluorine removal method which comprises the following steps: step 1, adjusting the pH value of fluorine-containing wastewater to be 5.0-6.5, adding polyaluminum chloride into the fluorine-containing wastewater for coagulation, and removing suspended solids and part of fluorine ions in the fluorine-containing wastewater to obtain pretreated fluorine-containing wastewater; step 2, performing graded adsorption treatment on the pretreated fluorine-containing wastewater in an adsorption tower by adopting a composite adsorbent of nano aluminum oxide and oxide-modified hydroxyapatite to obtain the fluorine-containing wastewater subjected to multi-stage adsorption; step 3, adding calcium chloride and sodium phosphate into the fluorine-containing wastewater subjected to multi-stage adsorption to generate calcium fluorophosphate precipitate, so as to obtain the precipitated fluorine-containing wastewater; and step 4, treating the precipitated fluorine-containing wastewater through an ultrafiltration membrane, wherein the fluorine concentration of the effluent is lower than 1.0 mg / L. The high-efficiency wastewater defluorination method provided by the invention can effectively improve the defluorination efficiency and reduce the dosage of chemicals, is low in treatment cost, and can be well suitable for high-efficiency and economic treatment of industrial fluorine-containing wastewater.

The various embodiments of the present invention provide a system and method for extraction of lithium from active materials of lithium iron phosphate battery. The method involves extraction of materials from spent battery and heating a mixture of the battery's black mass with suitable reagents at specific temperature in a predetermined ratio, to initiate a chemical reaction that efficiently produces lithium chloride, which is then extracted through water leaching. This method eliminates the need for harmful acids and solvents, operates at lower temperatures, and directly produces lithium chloride in a form that is both pure and economically valuable. Furthermore, the process is environmentally friendly, reduces operational costs, and enhances lithium recovery rates. By-products such as calcium fluorophosphate and iron oxide are also repurposed, supporting sustainability and reducing waste. This system offers a significant improvement over traditional methods, providing a safer, more sustainable, and cost-effective solution for recycling Lithium ion batteries.

The invention belongs to the technical field of fluorine-containing water treatment, and relates to a regulation and control method and a regulation and control system for fluorine removal of fluorine-containing underground water. The regulation and control method comprises the following steps: acquiring the fluorine ion concentration, alkalinity and magnesium ion concentration of actual fluorine-containing underground water; preparing simulated fluorine-containing groundwater and a phosphoric acid solution, and enabling the fluorine concentration of the simulated fluorine-containing groundwater to be the same as the fluorine ion concentration of the actual fluorine-containing groundwater; continuously increasing the alkalinity of the simulated fluorine-containing water until the alkalinity of the simulated fluorine-containing water is the same as the alkalinity of the actual fluorine-containing underground water, and adding an acid agent into the phosphoric acid solution; on the basis that the alkalinity reaches the alkalinity of the actual fluorine-containing underground water, magnesium salt is added into the simulated fluorine-containing water, so that the magnesium ion concentration of the simulated fluorine-containing water is the same as that of the actual fluorine-containing underground water; afterwards, the simulated fluorine-containing water is replaced by the actual fluorine-containing water, so that the fluorine concentration of the effluent can be reduced to 1.0 mg / L or below. The problem that the calcium fluophosphate precipitation reaction fails when the actual fluorine-containing underground water is treated by a calcium fluophosphate precipitation method is solved.