90 results about "Calcium Compounds" patented technology

The invention discloses a polyaryletherketone composite implant material and a preparation method and application thereof, and belongs to the technical field of medical materials.The preparation method of the polyaryletherketone composite implant material comprises the following steps that a carbon fiber reinforced polyaryletherketone substrate with the surface provided with a groove structure and conductivity is prepared; based on a precipitation method, a calcium compound, a magnesium compound and a phosphoric acid aqueous solution are used for preparing white calcium stone; the preparation method comprises the following steps: carrying out surface modification on the white calcium phosphate by utilizing polydopamine, so as to obtain modified white calcium phosphate; adding the modified white calcium phosphate and a degradable piezoelectric polymer into a solvent, and mixing to obtain a mixed solution; and coating a carbon fiber reinforced polyaryletherketone substrate with the mixed solution, and performing drying and annealing treatment to form a coating, thereby obtaining the polyaryletherketone composite implant material. According to the invention, the degradable piezoelectric composite coating doped with the white phosphorus calcium stone, which has piezoelectric characteristics and ion release capability, is constructed, so that double biomimetic effects of an electric signal and a chemical signal in a bone healing microenvironment are realized.

The invention belongs to the technical field of biological materials, and discloses a PEEK bone implant material of a piezoelectric catalysis biological heterojunction and a preparation method of the PEEK bone implant material, the material comprises a PEEK bone implant loaded with the biological heterojunction, the biological heterojunction is composed of BiVOO and a chalcogenide calcium compound in a molar ratio of 1-3, and the chalcogenide calcium compound is calcium sulfide, calcium selenide or calcium telluride; during preparation, the BiVO / CaX biological heterojunction is firstly prepared by a hydrothermal method or an in-situ composite method, then PEEK is sequentially subjected to acetone, ethanol and deionized water cleaning, sulfuric acid ultrasonic treatment for 5-10 minutes and dopamine modification, the biological heterojunction is in contact with the modified PEEK at 4 DEG C for 12 hours to complete loading, and improvement means can be introduced into part of schemes. The material has the acoustic catalytic antibacterial function and the bone repair promoting function, the antibacterial effect can be regulated and controlled through ultrasound, the process is simple, and the reaction condition is mild; the multi-drug-resistant bacterial infection can be dealt with, and the heterojunction loading stability and the material cell compatibility are improved.

The invention provides a method for accelerating carbon dioxide mineralization and sequestration based on a calcium ion-containing aqueous solution, and relates to the technical field of carbon dioxide capture, utilization and sequestration. The method comprises the following steps: selecting a calcium-containing compound, dissolving the calcium-containing compound in water, and uniformly stirring and mixing to obtain an initial aqueous solution; the calcium ion concentration in the initial aqueous solution is within a preset calcium ion concentration range; an alkaline regulator is added into the initial aqueous solution, a target aqueous solution is obtained, and the pH value of the target aqueous solution is within a preset pH value range; injecting the target aqueous solution into formation water of a target formation through injection equipment; carbon dioxide to be sealed is injected into the formation water, and calcium ions in the target water solution and carbonate ions generated after the carbon dioxide is dissolved in the formation water are subjected to mineralization reaction to form calcium carbonate precipitates. According to the method, CO2 dissolution and carbonate conversion are effectively promoted, generation of calcium carbonate precipitates is greatly accelerated, and the key bottleneck of slow reaction kinetics of a traditional mineralization method is overcome.

A method for producing calcium phosphate crystals according to the present invention comprises a step (S11) for preparing a weakly basic phosphoric acid solution containing a complex comprising a rare earth element ion and a coordination compound having a ligand coordinated to the rare earth element ion and a step (S12) for adding a calcium-containing compound to the weakly basic phosphoric acid solution and hydrolyzing. Some of the plurality of calcium ions contained in the structure of the calcium phosphate crystals are substituted by the rare earth element ion.

The invention relates to the technical field of medical materials, in particular to a composite root canal filling agent premixed with a calcium silicate-niobium compound as well as a preparation method and application of the composite root canal filling agent. The composite root canal filling agent comprises (a) a calcium silicate compound, (b) a phosphate compound, (c) a calcium compound, (d) a niobium compound, (e) a radiation-resistant material, (f) a water-miscible non-aqueous phase solvent and (g) an organic matter, the total mass of the component (a), the component (b), the component (c), the component (d), the component (e) and the component (g) accounts for 60-95% of the total mass of the filling agent, and the total mass of the component (a), the component (b), the component (c), the component (d), the component (e) and the component (g) accounts for 20-30% of the total mass of the filling agent. And the component (f) accounts for 5-40% of the total mass of the filling agent. The filling agent is fast in solidification, good in biological activity, excellent in antibacterial performance and convenient to popularize and apply.

The application relates to the technical field of composite materials, and discloses a prefabricated air-permeable coiled material and a preparation method thereof. From top to bottom, the prefabricated air-permeable coiled material comprises a surface layer and a bottom layer. The surface layer comprises the following raw materials in parts by weight: SEBS 30-40 parts, polypropylene 15-22 parts, a first filler 15-25 parts, a softening agent 25-30 parts, an antioxidant 1-3 parts and maleic anhydride grafted polypropylene 1-3 parts. The bottom layer comprises the following raw materials in parts by weight: SEBS 15-22 parts, polypropylene 30-40 parts, a second filler 20-30 parts, a softening agent 25-30 parts and maleic anhydride grafted polypropylene 1-3 parts. The first filler and the second filler are both calcium-containing compounds. Through the technical scheme, the problems of poor air permeability, wear resistance and mechanical properties of the prefabricated coiled material in the related art are solved.

The application provides a kind of asphalt pavement crack repair method based on EICP technology, it is related to road engineering field and biomimetic technology field.The repair method is repaired by using repair liquid, the repair liquid is obtained by mixing soybean urease solution and cementing liquid;The cementing liquid is urea, calcium compound and skimmed milk powder, and after adding water, stirring uniformly, wherein the optimum concentration ratio of soybean urease solution and cementing liquid is determined by orthogonal test;The repair method includes repair reaction space construction, repair reaction, maintenance polishing finishing and the like.The application is based on EICP technology, and the existing asphalt road crack repair method and the disadvantages of EICP technology in practical application are optimized, compared with other methods, has the advantages of fast, environmental protection, strong applicability, etc., and also provides a new method for asphalt pavement crack repair.

The present application relates to the technical field of rare earth concentrate processing, and particularly relates to a rare earth concentrate processing method. The rare earth concentrate processing method comprises the following steps: mixing and roasting a rare earth concentrate with a calcium-containing compound, silicon dioxide and carbon powder to obtain a roasted ore; adding water to the roasted ore to obtain a slurry; adding acid to the slurry to react, and then performing solid-liquid separation to obtain an acid leaching residue and a rare earth chloride solution. The present application has the advantages of simple process flow, high rare earth recovery rate, short reaction time, green environmental protection, low cost, and diversified applicability of rare earth grade. In the present application, the silicon dioxide can increase the decomposition activity of fluorcarbonate cerium and monazite in the rare earth ore, and can generate a rare earth compound that is easy to leach out, thereby improving the decomposition rate of the rare earth concentrate. Calcium can also play a role in fluorine fixation. The rare earth decomposition rate of the present application is above 98%, and the rare earth leaching rate is above 96%.

Methods are provided herein comprising: a) calcining limestone in a cement plant to form carbon dioxide and a calcium compound selected from calcium oxide, calcium hydroxide, or combinations thereof; b) treating the calcium compound with N-containing salt in water to produce an aqueous solution comprising calcium salt and N-containing salt; and c) contacting the aqueous solution with carbon dioxide under one or more precipitation conditions to produce a precipitate comprising calcium carbonate and a supernatant aqueous solution wherein the calcium carbonate comprises vaterite.

The application discloses a method for removing impurities from a lithium-containing solution, application and system thereof, and belongs to the technical field of lithium ion battery materials. The method provided by the application comprises the following steps: reacting the lithium-containing solution with a calcium compound, and then performing solid-liquid separation; the calcium compound comprises at least one of calcium oxide and calcium hydroxide; the lithium-containing solution further contains magnesium ions and sulfate ions; and the mass ratio of the one with a larger amount in the magnesium ions and the sulfate ions to the calcium compound is 1:1.05-1.3. The method provided by the application can remove most of calcium, magnesium and sodium impurities in the lithium-containing solution through one-step method, and the impurity removal step is simple and low in cost. The application also provides application of the method and a system for implementing the method.

To provide a method for producing a hydraulic hardened body, which reduces the amount of energy consumption and the amount of CO2 discharge in material production and is excellent in producibility of a precast product.SOLUTION: A method for producing a hydraulic hardened body includes kneading and hardening a hydraulic composition containing a binder (A), an admixture (B), water, an aggregate, and an admixture, wherein the proportion of the admixture (B) in the total of the binder (A) and the admixture (B) is 2 mass% to 10 mass%. In the binder (A), the proportion of the high-early-strength portland cement is 20 mass% to 55 mass%, the proportion of the blast furnace slag fine powder is 45 mass% to 75 mass%, and the total of these two components accounts for 90 mass% or more of the whole. The admixture (B) contains organic calcium salts, inorganic calcium compounds, and inorganic sulfates, and has a CaO content of 53 mass% to 58 mass%, a SO3 content of 15 mass% to 20 mass%, a total alkali content of 2.5 mass% to 2.8 mass%, and an ignition loss of 20 mass% to 25 mass%.SELECTED DRAWING: None

The present invention relates to a method for recovering lithium and, more specifically, to a method for recovering lithium, the method comprising the steps of: (a) dissolving cathode material powder including a cathode active material having an olivine structure in an acidic solution to prepare a solution; (b) adding the solution with an aqueous hydrogen peroxide (H2O2) solution to obtain a first leachate and a first leach residue, followed by separating same; (c) adding a calcium compound to the separated first leachate to obtain a second leachate and a second leachate residue, followed by separating same; (d) diluting the separated second leachate with water; (e) injecting carbon dioxide to the diluted second leachate to obtain a third leachate and a third leachate residue, followed by separating same; and (f) concentrating the separated third leachate. According to the present invention, there is an effect of providing a method for recovering lithium, in which cathode active material powder including a cathode active material having an olivine structure is dissolved in an acidic solution and an aqueous hydrogen peroxide solution is added thereto to obtain a leachate to which a calcium compound is then added to precipitate and remove impurities such as Fe, P, etc., followed by adding carbon dioxide to precipitate and remove residual calcium components, thereby increasing the purity and recovery rate of lithium.

The application provides an experimental device and method for formation dissolution in carbon dioxide geological storage. The device comprises: a visualized autoclave system, including an autoclave with a first visualized transparent window; a double-continuous-phase particle accumulation experimental model placed in the autoclave opposite to the first visualized transparent window, which comprises: a Hele-Shaw glass model, a double-continuous-phase suspension accommodated in the Hele-Shaw glass model, which is prepared by mixing a saturated solution of an alkaline calcium compound with a set amount of water-insoluble calcium salt, and inert particles uniformly accumulated in the double-continuous-phase suspension; a carbon dioxide injection system for injecting carbon dioxide gas into the autoclave in a set manner; and an information acquisition and regulation system for acquiring environmental parameters in the autoclave and image information of the double-continuous-phase particle accumulation experimental model during the formation dissolution experiment. The carbon dioxide storage in a saline aquifer and the formation dissolution process can be simulated and visually monitored under experimental conditions.

Provided is a concrete composition containing a binder, a curing accelerator for a hydraulic material, and water, wherein: the binder content is 300 kg / m3 or more; the water-binder ratio is 55% or less; the added amount of the curing accelerator for a hydraulic material is 1-50 kg / m3; and the curing accelerator for a hydraulic material contains 20.0-80.0 mass% of calcium formate, 15.0-70.0 mass% of an inorganic calcium compound, and 0.5-30.0 mass% of an inorganic sulfate excluding calcium sulfate.

To provide a method for efficiently regenerating wastewater solutions of sodium hydroxide. [Solution] A method for regenerating a waste sodium hydroxide aqueous solution containing aluminum, comprising the steps of: mixing and reacting an aqueous slurry containing a calcium compound with the waste sodium hydroxide aqueous solution to form a reaction solution containing a supernatant liquid and a solid reaction residue; and subjecting the reaction solution to a solid-liquid separation treatment to remove the reaction residue, thereby recovering the supernatant liquid as a regenerated sodium hydroxide aqueous solution.

This invention discloses a modified biochar, its preparation method, and its uses. The modified biochar of this invention comprises biochar and a calcium-containing compound loaded on the biochar at a loading of 10-30% of the modified biochar mass, wherein the calcium-containing compound is at least one of CaO and Ca(OH)₂. This invention modifies biogas residue with calcium carbonate, resulting in pore filling within the mesopores of the biochar in the 4 nm-10 nm range. The modified biochar promotes the retention of surface O-C=O and C=O oxygen-containing functional groups, and the modified biochar prepared by this invention still maintains good strength. This invention also provides a method and apparatus for treating phosphorus-containing wastewater with modified biochar. Intermittent adsorption reactions of the biochar show that the adsorption performance of the modified biochar of this invention is superior to that of unmodified biochar, with a saturated adsorption capacity between 18 and 20 mg-P / g-BC, making it suitable for use in wastewater treatment plants.

The present invention provides an iron phosphate adsorbent used in pre-concentration of a low-concentration lithium-containing solution. The iron phosphate adsorbent is a mixture of ferric phosphate and a calcium compound, and the mass ratio of the mixture is: ferric phosphate:calcium compound=1:(0.1-1). The present invention further provides a use of an iron phosphate adsorbent in pre-concentration of a low-concentration lithium-containing solution. The adsorbent of the present invention has low cost and simple preparation method, and preliminary concentration of a low-concentration lithium-containing solution can be achieved without adding an organic matter and using the technical means of evaporation for concentration, thereby avoiding organic pollution and reducing energy consumption.

The application discloses a kind of polyaryletherketone composite implant materials and preparation method and application, and belongs to medical material technical field, wherein, the preparation method of the polyaryletherketone composite implant material includes the following steps: preparation surface has recess structure and the carbon fiber reinforced polyaryletherketone base of conductivity;Based on precipitation method, white brushite is prepared using calcium compound, magnesium compound and phosphoric acid aqueous solution;White brushite is surface modified using polydopamine, to obtain modified white brushite;Modified white brushite is mixed with degradable piezoelectric polymer into solvent, to obtain mixed solution;Mixed solution is coated on carbon fiber reinforced polyaryletherketone base, after drying, annealing treatment, form coating, to obtain polyaryletherketone composite implant material.The application constructs white brushite doped degradable piezoelectric composite coating with piezoelectric characteristics and ion release capacity simultaneously, realizes the dual bionics of electric signal and chemical signal in bone healing microenvironment.

The utility model relates to the technical field of inclinometer path cleaning, in particular to a sliding mechanism and an inclinometer drill hole cleaning device. The supporting piece is rotationally arranged on the connecting piece; two ends of the tension spring are respectively connected with the connecting piece and the supporting piece; the supporting piece comprises a first connecting rod and a second connecting rod which are connected with each other; a plurality of supporting pieces are arranged; and the scraping plate is arranged on the connecting piece. The sliding mechanism slides in the inclinometer track and is matched with the scraping plate to clean the inner wall of the inclinometer track, so that calcium compounds in the inclinometer track can be conveniently removed, and the cleaning difficulty of the interior of the inclinometer track is effectively reduced.

The invention discloses porous biological ceramic as well as a preparation method and application thereof, and belongs to the technical field of biological material preparation. The preparation method comprises the following steps: dropwise adding a phosphorus-containing compound solution into a calcium-containing compound solution under the condition that the pH value is 6-12, reacting to generate a biological ceramic precursor, centrifuging, drying, calcining, grinding and sieving the precursor to obtain biological ceramic powder, and then mixing the powder with a dispersing agent, a binder and water to prepare biological ceramic slurry; mixing the slurry with a pore-forming agent, and drying to obtain a biological ceramic blank; and finally, shaping and sintering the blank body to obtain the porous biological ceramic. According to the method, regulation and control of the pH value of a reaction system are taken as a main means, and the calcination temperature of the precursor is controlled, so that continuous, accurate and repeatable control on the proportion of two phases of hydroxyapatite and beta-tricalcium phosphate in the biological ceramic can be realized.

A dental anhydrous varnish composition including at least one calcium silicate compound, preferably in an amount ranging from 0.1% to lower than 20% by weight relative to the total weight of the composition, at least one film-forming agent, and at least one volatile organic solvent. Also, composition's use in the treatment and / or the prevention of hypomineralization related pathologies. Further, a dental product and to a dental adhesive film.

The application provides a method for recovering chlorinated rare earth from rare earth materials, and belongs to the technical field of rare earth hydrometallurgy. The method comprises the following steps: uniformly mixing the rare earth materials with a calcium-containing compound and carbon powder, heating, and reacting in a molten state to obtain roasted ore; crushing and grinding the roasted ore, uniformly mixing the roasted ore with water, and then adding hydrochloric acid to perform reaction 2; after the reaction 2 is completed, solid-liquid separation is performed to obtain a chlorinated rare earth solution and a leaching residue; and the temperature of the reaction 1 is 1500 DEG C-2000 DEG C, and the time is 0.5-2h. In the method, the rare earth materials do not need to be pretreated by grinding and sieving, and can directly react with the calcium-containing compound and the carbon powder, so that the process flow is short. The rare earth decomposition rate of the slag is above 98%, the rare earth leaching rate is above 96%, and the recycling and utilization of the rare earth resources are effectively realized.

The invention provides an anti-aging ethylene propylene diene monomer rubber compound which comprises a main material and an auxiliary material, the main material comprises the following components in parts by mass: 50-100 parts of maleic anhydride modified ethylene propylene diene monomer, 60-100 parts of a reinforcing filler, 40-60 parts of a plasticizer, 10-30 parts of N330 carbon black, 10-25 parts of mineral oil, 2-4 parts of an anti-aging agent, 1-5 parts of polyethylene glycol, 2-4 parts of a modifier, 2-5 parts of a compound containing a peroxy (O-O) structure, 3-10 parts of hyperbranched phosphamide modified graphene oxide and 5-10 parts of a calcium compound; 5-10 parts of hydrogenated silicone oil and 1.5-5 parts of an anti-aging agent; the auxiliary materials comprise the following components in parts by mass: 0.5-2 parts of stearic acid, 2-5 parts of zinc oxide, 10-15 parts of a solubilizer, 0.01-0.02 part of a catalyst and 0.2-0.5 part of a vulcanization accelerator; according to the present invention, with the synergistic effect of the peroxide (O-O) structure-containing compound, the hyperbranched phosphamide modified graphene oxide, the calcium compound and the hydrogenated silicone oil crosslinking, the strength and the toughness of the ethylene propylene diene monomer are enhanced, the damping performance of the ethylene propylene diene monomer is improved, the micro-damage is self-repaired in the thermal environment, the aging resistance of the rubber is increased, and the service life is prolonged.

This invention discloses the application of a drug in the prevention or treatment of hydrocephalus, belonging to the field of pharmaceutical formulation technology. The drug comprises a pharmaceutically acceptable formulation of one or more of the following active ingredients: compound A, compound B, or compound C, and their pharmaceutically acceptable salts, solvates, or crystal forms; compound A is carbaspirin calcium, compound B is aspirin, and compound C is salicylic acid. This invention utilizes the above-mentioned drug in the prevention or treatment of hydrocephalus. Carbaspirin calcium and its metabolites can significantly reduce ventricular enlargement in a hydrocephalus model rat, and carbaspirin calcium and its metabolites show promise in the preparation of drugs for treating hydrocephalus, providing an effective candidate drug to alleviate the suffering of hydrocephalus patients, reduce treatment risks and costs; it broadens the scope of action of carbaspirin calcium and optimizes the stability formulation of carbaspirin calcium.

The application discloses a kind of magnetic biochar based on solid waste and its preparation method and application, preparation method is to red mud excessive nitric acid is fully reacted after solid-liquid separation, obtain the mixed solution containing iron nitrate, aluminum nitrate and calcium nitrate and SiO2 Solid product;Broken straw particle is added to mixed solution and is fully stirred and mixed, impregnation;Appropriate alumina is added to mixed solution, and the Fe / Al ratio in mixed solution is adjusted to (1~2):1;Straw after impregnation is washed and dried, and is fully mixed with calcium-rich compound after high-temperature pyrolysis treatment in anoxic environment, after cooling, grinding and screening, magnetic biochar is obtained.The raw materials required for the preparation of the material are mainly derived from industrial and agricultural solid waste, and the preparation cost is low, which can effectively realize the resource utilization of industrial and agricultural solid waste.The material has excellent adsorption performance for trace elements such as phosphorus, cadmium and arsenic, and can separate and remove pollutants from the medium by magnetic separation.

The invention discloses a purification method of magnetite concentrate, and belongs to the technical field of extreme purification of magnetite concentrate. The purification method comprises the following steps: carrying out ultrafine grinding on a magnetite concentrate raw material, adding alkali metal hexametaphosphate and alkali metal silicate, carrying out flocculation desliming to obtain primarily purified magnetite, and adding a magnetite inhibitor, a composite collector and an activator into ore pulp containing the primarily purified magnetite for reverse flotation, the composite collecting agent comprises fatty amine and a zwitterionic surfactant, and the activating agent comprises a calcium compound and a rare earth compound. The separation and removal effects of gangue minerals and impurity metal elements are greatly improved through flocculation desliming and a specific flotation reagent system, the yield and recovery rate of the high-purity magnetite concentrate are improved while the grade of the magnetite concentrate is improved, and the method is simple, low in cost, small in reagent dosage in the flotation process, environmentally friendly and suitable for industrial application.

The application discloses a wet-process phosphoric acid production process for comprehensive utilization of full-element resources of phosphate rock, and belongs to the field of phosphorus chemical production. The process comprises the following steps: decomposing phosphate rock, a decomposing solution and a bottom solution to obtain a primary decomposing solution and primary decomposing residue; crystallizing the primary decomposing solution to obtain ammonium biphosphate crystals and a crystallization mother liquor of the ammonium biphosphate crystals; directly selling the ammonium biphosphate as a product or transforming the ammonium biphosphate to produce high-quality phosphoric acid, and returning the obtained crystallization mother liquor to preparation of the decomposing solution or the decomposing bottom solution; transforming the primary decomposing residue through ammonium carbonate to obtain an ammonium sulfate solution and a calcium carbonate filter cake; returning the ammonium sulfate solution to preparation of the decomposing solution or comprehensive utilization; transforming the calcium carbonate filter cake through ammonium chloride to obtain a mixed gas containing CO2 and NH3, a calcium chloride solution and an insoluble residue; and further producing calcium-containing compounds from the calcium chloride solution. The process provided by the application can absorb phosphate gypsum from the source, has low sulfuric acid consumption, high fluorine leaching rate, high comprehensive utilization rate of calcium resources, and good quality of the phosphoric acid obtained through transformation.

The invention relates to the technical field of wastewater treatment, in particular to a high-salinity wastewater agent as well as a preparation method and application thereof. The high-salinity wastewater medicament is prepared from a calcium-containing compound, an aluminum source compound and a crystal structure regulator, the molar ratio of a calcium element to an aluminum element in the calcium-containing compound to the aluminum-source compound is (2: 1)-(4: 1); the mass of the crystal structure conditioning agent is 10-30% of the total mass of the high-salinity wastewater agent. When the agent is applied, the agent is added into high-salinity wastewater with the chloride ion concentration of 5-25 g / L, a Freund's salt precipitate is generated through a calcium-aluminum synergistic reaction, and therefore efficient fixing and removal of chloride ions are achieved. The agent has the advantages of being simple in component, low in cost, high in dechlorination efficiency and wide in applicable concentration range, after the crystallization regulating agent is added, the Freund salt sediment can be rapidly settled, and the volume of the sediment is greatly reduced.

The application discloses a method for resource utilization of low-grade and refractory tin-containing tailings, and belongs to the technical field of solid waste resource utilization. The method comprises the following steps: uniformly mixing the low-grade and refractory tin-containing tailings with a fluorine-containing calcium compound, an alkalinity adjusting agent and a carbonaceous reducing agent, and then performing reduction roasting, recovering tin products from roasting flue gas, and using the remaining roasting tailings to prepare cementing materials. The method can not only efficiently recover tin from the low-grade tin-containing tailings, but also can use the tailings after tin recovery to prepare cementing materials with high added value, so that the resource utilization of the tailings is realized.

This invention relates to the field of phosphoric acid wastewater purification technology, and discloses a composite agent, its preparation method, and its application. The composite agent contains calcium-containing substances, iron-containing substances, aluminum-containing compounds, diatomaceous earth, and activated carbon. The calcium-containing substances are calcium-containing compounds and / or calcium-containing minerals, and the iron-containing substances are iron-containing compounds and / or iron-containing minerals. Based on the total weight of the composite agent, the content of the calcium-containing substances is 30wt%~75wt%, the content of the iron-containing substances is 5wt%~15wt%, the content of the aluminum-containing compounds is 10wt%~20wt%, the content of the diatomaceous earth is 5wt%~25wt%, and the content of the activated carbon is 5wt%~25wt%. This composite agent can achieve efficient removal of phosphorus, acid, and organic matter from wastewater, while improving the degree of process automation, resulting in stable treatment effects and reduced treatment costs.