14 results about "Calcium hydroxyphosphate" patented technology

The invention discloses a grading reaction crystallization recovery process and system for semiconductor fluorine-containing and phosphorus-containing waste liquid, the fluorine-containing and phosphorus-containing waste liquid and a lime solution react in a fluorine recovery crystallization reactor under the condition that the pH is 3-4 to form calcium fluoride crystals, and the calcium fluoride crystals are dehydrated to obtain calcium fluoride particle crystal products; the effluent of the fluorine recovery crystallization reactor, the calcium fluoride crystal dehydration filtrate, the lime solution and the calcium chloride solution react in a secondary reaction tank under the condition that the pH is 5-6, and calcium fluoride, fluorapatite, silicon dioxide and silicon-aluminum precipitates are removed through coagulation, flocculation and precipitation; effluent of the second-stage reaction tank, the lime solution and the calcium chloride solution react in the phosphorus recovery crystallization reactor under the condition that the pH is 7-8 to generate hydroxyapatite crystals, and the hydroxyapatite crystals are dehydrated to obtain hydroxyl calcium phosphate particle crystal products. Meanwhile, a high-purity calcium fluoride crystal product and a hydroxyl calcium phosphate crystal product are produced, and fluorine and phosphorus are recycled.

The invention discloses hydroxyl calcium phosphate applied to a lithium battery diaphragm, and a preparation method and application thereof in the technical field of lithium battery materials, and aims to solve the problem of battery capacity fading caused by Mn dissolution in a manganese positive electrode lithium battery. The hydroxy calcium phosphate is prepared by adopting a coprecipitation method: forming a turbid liquid from a calcium source in the presence of a dispersing agent, adjusting the pH value to 11-12, heating to 60-90 DEG C, gradually adding a phosphorus source solution, and cooling, filtering, washing, drying and roasting after the reaction is finished to obtain a target product. The method is characterized in that hydroxyl calcium phosphate is used as a Mn adsorbent for coating the lithium battery diaphragm for the first time, dissolved Mn is effectively captured in an anhydrous organic electrolyte system, migration of the dissolved Mn to a negative electrode is inhibited, and therefore the cycle specific capacity and stability of the battery are improved. The method provides a new scheme for solving the problems of high cost of a traditional positive electrode coating technology, serious environmental pollution of an organic trapping agent and poor low-concentration adsorption effect.

The invention discloses a sulfur-resistant CO oxidation catalyst and a preparation method thereof. The catalyst is composed of a date-pit-shaped polycrystal phosphate nanofiber carrier and a noble metal active component loaded on the crystal face at the end of a date pit, the date-pit-shaped polycrystal phosphate nanofiber carrier is formed by one or more of hydroxyl calcium phosphate, iron phosphate or aluminum phosphate, and the noble metal active component is at least one of Pt, Pd, Au and Ru. The preparation method comprises the following steps: in the presence of a polyol surfactant, carrying out periodic oscillation crystallization-segmented calcination to obtain a date-pit-shaped polycrystalline carrier, and directionally anchoring the noble metal on the crystal face at the end part of the carrier through ion exchange. The catalyst prepared by the invention shows excellent CO oxidation activity, sulfur poisoning resistance and long-term stability in sulfur-containing industrial flue gas such as steel sintering flue gas, and is suitable for working conditions of 200-350 DEG C and containing pollutants such as SO2.

The invention relates to the technical field of functional dairy products, in particular to formula goat milk powder for middle-aged and elderly people with omega-3 and phosphatidylserine stable in intestinal tracts. Comprising the following raw materials in parts by weight: 500 to 550 parts of raw goat milk, 25 to 30 parts of an Omega 3 composite raw material, 8 to 12 parts of hydroxy calcium phosphate, 0.005 to 0.01 part of vitamin K2, 15 to 20 parts of a prebiotic composition, 350 to 400 parts of a probiotic composition, 5 to 8 parts of phosphatidylserine, 40 to 50 parts of isomaltooligosacharide, 25 to 30 parts of fructo-oligosaccharide, 30 to 50 parts of WPC34 whey protein powder, 20 to 25 parts of lecithin, 20 to 25 parts of lactobacillus casei freeze-dried bacterial powder and 0.02 to 0.03 part of vitamin E, 1-2 parts of sodium citrate; the Omega 3 composite raw material is prepared from 15 to 18 parts of linseed oil and 10 to 12 parts of algae oil; according to the intestinal steady-state omega-3 and phosphatidylserine formula goat milk powder for the middle-aged and elderly people, a multi-point synergistic protection system is constructed by compounding the omega-3 composite raw material, the hydroxyl calcium phosphate and the vitamin K2, and the problem that an existing formula is single in function is fundamentally solved.

The application belongs to the technical field of soil remediation, and relates to an organic-inorganic composite remediation material for heavy metal passivation of farmland soil and a preparation method thereof, which comprises the following steps: dissolving magnesium salt and aluminum salt in deionized water to obtain a mixed salt solution; adding sodium hydroxide solution into the mixed salt solution, and then performing heating reaction after the addition is completed to obtain LDH slurry; adding deionized water into the LDH slurry to obtain LDH dispersion; simultaneously adding calcium chloride solution and disodium hydrogen phosphate solution into the LDH dispersion, adding alkali liquor to adjust the pH value in the process of adding, and then performing heating reaction after the addition is completed to obtain hydroxyapatite loaded LDH powder; adding citric acid into sodium alginate solution to perform reaction, and then obtaining modified sodium alginate solution; dispersing the hydroxyapatite loaded LDH powder in the modified sodium alginate solution to obtain a suspension; mixing calcium chloride solution and aluminum chloride solution to obtain a crosslinking solution; adding the suspension into the crosslinking solution to perform crosslinking and solidification, and then performing drying to obtain the organic-inorganic composite remediation material.

The invention discloses a method for synergistically improving soil fertility through a soil conditioner and green manure crops, and belongs to the technical field of soil improvement, and the method comprises the following steps: after rice is harvested, soil is deeply ploughed and tedded, the soil conditioner is uniformly spread on the surface of the soil, and then the green manure crops are planted; in the full-bloom stage of the green manure crops, the green manure crops are turned and returned to the field; and finally transplanting rice seedlings. The soil conditioner comprises the following raw materials: enteromorpha-based biochar, diatomite, silica sol, plant ash, hydroxy calcium phosphate, magnesium sulfate heptahydrate and ferrous sulfate. Through scientific compatibility of modifier components and precise agronomic process design, the short-term fertility of the red and yellow soil low-yield field is remarkably improved, a long-acting soil fertility improvement mechanism is established through continuous input of green manure, the yield of rice is increased, and remarkable ecological value and economic value are achieved.

The application discloses a steel slag conversion method for total chromium removal, and belongs to the field of functional materials. The steel slag is subjected to water bath treatment in an alcohol-water mixed solvent by using an organic carboxylic acid, then the obtained powder is dispersed in water, the suspension is adjusted to an alkaline pH of 8-11, and then a phosphate is added to perform a heating reaction in a water bath. In the application, by controlling the reaction conditions, the elements such as Fe and Ca rich in the steel slag can be effectively utilized, the iron ions in the steel slag are converted into carboxylic acid complexes, and the calcium ions are converted into calcium hydroxyphosphates, so that the illumination reduction of Cr(Ⅵ) and the adsorption and fixation of Cr(III) products are realized respectively, and the purpose of effectively removing chromium is achieved. Therefore, the application not only realizes the effective utilization of the steel slag solid waste, but also realizes the removal of chromium pollutants in sewage, and has good economic value and environmental effect.

The invention relates to the technical field of phosphorus-containing wastewater treatment and recycling, in particular to a process and reaction system for synthesizing spherical hydroxyl calcium phosphate by using phosphorus-containing wastewater, and the process comprises the following steps: S1, continuously conveying phosphorus-containing wastewater into a main reaction device, and synchronously dropwise adding alkali liquor into the main reaction device under a continuous stirring condition to construct an initial environment; s2, continuously conveying the calcium salt solution into the main reaction device, forming a reaction zone in the middle of the main reaction device, and carrying out a crystallization reaction; s3, draining crystal mush formed by the crystallization reaction from the bottom of the main reaction device and refluxing to the reaction zone to promote crystal particles in the crystal mush to continuously participate in the crystallization reaction; and S4, discharging crystal particles formed by crystallization from the bottom of the main reaction device, and carrying out separation treatment to obtain spherical hydroxyl calcium phosphate particles. By accurately controlling crystallization reaction conditions, spherical hydroxyl calcium phosphate particles with uniform particle morphology are obtained, and the recovery efficiency of phosphorus resources in wastewater is improved.

The invention is a divisional application of a Chinese invention patent application with an application number of 202510145545. X, an application date of February 10, 2025, and an invention name of a sewage treatment method based on sulfate reduction and endogenous sulfur autotrophic denitrification. The method comprises the following steps: feeding sewage into an anoxic tank, and adding sodium sulfate and sulfate reducing bacteria; effluent of the anoxic tank enters a primary sedimentation tank to realize mud-water separation, effluent containing sulfur anions and nitrate ions is discharged into a sulfur autotrophic denitrification filter tank, and phosphorus-containing sludge is discharged into an anaerobic phosphorus discharge tank; elutriating the anaerobic phosphorus discharge tank to remove residual sulfate ions in the phosphorus-containing sludge, discharging supernate containing phosphate ions into a secondary sedimentation tank, and refluxing the phosphorus-released sludge into the anoxic tank; lime is added into the secondary sedimentation tank, and phosphate ions in the sewage are converted into hydroxyl calcium phosphate precipitates to form a fertilizer. The sewage treatment method disclosed by the invention is low in oxygen consumption and less in residual sludge, and the sewage treatment cost is greatly reduced; meanwhile, heavy metal in the sewage is effectively removed, phosphorus in the sewage is converted into fertilizer, and effective treatment of phosphorus is achieved.

The application belongs to the technical field of tungsten hydrometallurgy, and particularly relates to a method for deep phosphorus removal from a crude sodium tungstate solution, which comprises the following steps: placing activated carbon in a dilute nitric acid solution for activation; adding the activated activated carbon into the crude sodium tungstate solution containing a flotation agent and phosphorus elements, performing first stirring, then adding calcium salt, performing second stirring and heating, and finally performing solid-liquid separation to obtain the phosphorus-removed sodium tungstate solution. The oxygen-containing functional groups on the surface of the activated carbon after activation can induce interface mineralization of calcium hydroxyl phosphate, overcome the phosphorus removal bottleneck that cannot be broken through by the traditional calcium salt precipitation method, remove the flotation agent by pre-adsorption of the activated carbon, avoid the wrapping of organic colloids on the precipitated particles, make the settling speed of the phosphorus removal residue fast and the filtration performance good, greatly improve the production operation conditions, significantly reduce the consumption of the subsequent phosphorus removal agent, further reduce the purification cost of tungsten smelting, and be easy to implement and popularize in the existing tungsten smelting production line.

This invention discloses a method and apparatus for preparing a soil pollution remediation engineering catalyst, specifically belonging to the field of soil remediation technology. The soil pollution remediation engineering catalyst is a modified zinc-iron oxide mineral piezoelectric material, mainly composed of multilayer magnetically responsive zinc-iron oxide nanoblocks supported on brominated polyhydroxy magnesium phosphate foam. The preparation method includes the preparation of multilayer magnetically responsive zinc-iron oxide nanoblocks, the preparation of brominated polyhydroxy magnesium phosphate foam, and the preparation of the modified zinc-iron oxide mineral piezoelectric material. The application apparatus of this soil pollution remediation engineering catalyst includes an electromagnetic-piezoelectric catalytic system and a piezoelectric catalytic auxiliary system. The modified zinc-iron oxide mineral piezoelectric material is forced to deform by magnetic force and the mechanical force generated by mixing, thereby activating persulfate degradation of pollutants in the soil. This invention features high treatment efficiency, low energy consumption, and environmental friendliness, providing a novel remediation method for soil remediation.

This application belongs to the field of tungsten hydrometallurgical technology, specifically a method for deep phosphorus removal from crude sodium tungstate solution, comprising the following steps: activating activated carbon in a dilute nitric acid solution; adding the activated activated carbon to a crude sodium tungstate solution containing flotation agent and phosphorus, performing a first stirring, then adding calcium salt, performing a second stirring and heating, followed by solid-liquid separation to obtain a phosphorus-removed sodium tungstate solution. The oxygen-containing functional groups reconstructed on the surface of the activated carbon in this application can induce interfacial mineralization of hydroxyapatite, overcoming the phosphorus removal bottleneck that traditional calcium salt precipitation methods cannot overcome. By pre-adsorbing and removing the flotation agent with activated carbon, the encapsulation of precipitated particles by organic colloids is avoided, resulting in faster settling speed and better filtration performance of the phosphorus-removed slag, greatly improving production operating conditions, and significantly reducing the consumption of subsequent phosphorus removal agents, further reducing the purification cost of tungsten smelting, and is easy to implement and promote in existing tungsten smelting production lines.

The present application relates to the technical field of soil improvement, and discloses a method for improving the fertility of newly reclaimed red-yellow soil farmland, comprising the following steps: (1) after the newly reclaimed red-yellow soil farmland is leveled, urea-formaldehyde fertilizer and humic acid fertilizer are applied; (2) composted cow manure or sheep manure organic fertilizer is applied; (3) soil conditioner is applied, the soil conditioner comprising hydroxyl calcium phosphate and silicon sol modified enteromorpha-based biochar, diatomite and calcium-magnesium phosphate fertilizer; (4) liquid fertilizer is applied; steps (1) to (4) need to be carried out several times of turning into the soil respectively, so that the fertilizer is uniformly mixed with the plough layer soil. The present application improves the acid environment of the red-yellow soil by applying different fertilizers in cooperation, increases the organic matter and total nitrogen and other mineral nutrient content of the plough layer soil of the newly reclaimed farmland, achieves the effect of rapidly improving the soil physicochemical properties and increasing the microbial activity, and then fertilizes and improves the newly reclaimed red-yellow soil.

The invention discloses a calcium phosphate crystal phosphorus recovery method and system suitable for high-phosphorus and low-phosphorus wastewater. The phosphorus recovery method comprises the following steps: firstly adjusting the pH value of phosphorus-containing wastewater to 9.0-10.0, and then adding calcium salt into the phosphorus-containing wastewater, or firstly adding aluminum salt hydrolysate and then adding the calcium salt to obtain wastewater containing calcium phosphate microcrystals; adding aluminum salt into the wastewater, stirring and mixing, carrying out solid-liquid separation to obtain a phosphorus recovery product and clarified wastewater, and discharging the clarified wastewater after reaching the standard; then adding a NaOH solution into the phosphorus recovery product for dissolving and purifying, and carrying out solid-liquid separation on the obtained product to obtain hydroxyl calcium phosphate and a metaaluminate solution; and finally, adding strong acid into the meta-aluminate solution to carry out neutralization reaction, and regenerating into aluminum salt for reutilization. The phosphorus recovery method disclosed by the invention is high in recovery efficiency, can simultaneously realize purification of a phosphorus recovery product and repeated utilization of aluminum salt, and is remarkable in economic benefit and social benefit.