7 results about "Calcium fluorophosphate" patented technology

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.

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.

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 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 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.