57 results about "Calcium crystals" patented technology

The invention discloses a method for reinforcing a defective pile body based on an MICP principle, and the method comprises the steps: carrying out the excitation of a defective pile through a low-strain reflected wave method, collecting a first vibration response signal of a pile top, and analyzing the phase and wave velocity abnormality of a time-domain reflected wave to determine the defect information of the pile body; slurry parameters and grouting parameters are generated based on the pile body defect information, MICP slurry is configured, and a grouting pipe network system is arranged in the circumferential direction of a pile body; grout is injected into the defect area through a grouting pump, feedback signals are synchronously collected, and the opening degree of the valve set is dynamically adjusted through a PID algorithm to optimize the grouting process; and after grouting is completed, a second vibration response signal of the pile top is detected regularly through a low-strain reflected wave method, and grouting effect evaluation information is generated through comparative analysis. According to the method, through accurate defect positioning, intelligent grouting parameter regulation and control and real-time feedback correction, efficient filling of the calcium carbonate crystals to the pile body defects is achieved, the overall strength and bearing performance of the pile foundation are improved, the repairing pertinence is high, the automation degree is high, and the environment compatibility is good.

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 present invention discloses a method for preparing anhydrous iron phosphate from medium and low grade phosphate rock, which comprises the following steps: Step 1: Provide medium and low grade phosphate rock; Step 2: Mix the phosphate rock with hydrochloric acid in a decomposition tank and fully react to obtain a first slurry; Step 3: Place the first filtrate into a sedimentation tank; Step 4: Add mixed acid to calcium dihydrogen chloride phosphate crystals, carry out pulping and filtration to obtain a second filtrate and a filter cake; Step 5: Finally, filter to obtain a gypsum product and a third filtrate; Step 6: The third filtrate in Step 5 is purified with saturated ferrous sulfate. The fourth filtrate obtained through a microfilter is continuously added with a saturated ferrous sulfate solution, then continuously added with 5-25% hydrogen peroxide, reacted for 5-35 minutes, then added with sodium hydroxide solution to adjust the pH value to 1.9-2.1, and kept warm and continuously reacted for 3-6 hours, and the iron phosphate obtained by filtration; Step 7: Dry the iron phosphate obtained in Step 6 at 150-170 °C to obtain anhydrous iron phosphate.

The application discloses a kind of based on hydration calcium silicate and polycrystalline fiber composite board and preparation method, belong to inorganic fireproof heat insulation board technical field. Including board body, the board body is by following component weight parts constitutes: calcium source 25-45 parts, silicon source 30-55 parts, polycrystalline fiber 5-25 parts, interface modifier 0.5-3 parts, dispersing agent 0.1-1 part, foam stabilizer 0.1-0.5 parts, water 150-300 parts;The calcium source and silicon source hydrothermal reaction generate hydration calcium silicate crystal, the hydration calcium silicate crystal is mutually interwoven and forms porous matrix skeleton, the polycrystalline fiber disperses in the porous matrix skeleton, the hydration calcium silicate crystal in-situ growth on polycrystalline fiber surface, and forms chemical combination layer with polycrystalline fiber.The based on hydration calcium silicate and polycrystalline fiber composite board and preparation method of the application, the prepared board has excellent fireproof heat insulation performance, while having good mechanical toughness, impact resistance and high temperature long-term stability.

The invention relates to the technical field of polygonatum sibiricum steaming, in particular to a polygonatum sibiricum steaming processing technology, which adopts a strategy of'enzymolysis pretreatment + segmented temperature control steaming ', and has the core that pectinase (2.5-5.0 g / L) and beta-glucanase (1.5-4.0 g / L) are utilized to directionally degrade phlegm polysaccharide chains in a buffer solution with the pH value of 5.0-5.5, so that the viscosity is reduced, the crystal structure of calcium oxalate is damaged, and the polygonatum sibiricum steaming processing technology is realized. The calcium oxalate crystal precipitation speed is accelerated; the total number of times required by subsequent steaming and drying circulation is reduced; cO2 / O2 mixed gas is introduced to strengthen the enzymolysis effect, create a slightly acidic environment, activate the enzyme activity and improve the phlegm decomposition efficiency; the dissolution of calcium oxalate crystals is accelerated, and the content of residual irritants is reduced; the problems that a traditional polygonatum sibiricum steaming process is long in consumed time and is greatly influenced by weather are solved.

The application discloses an open set recognition method for urine red blood cells, white blood cells and calcium oxalate crystals. The method comprises the following steps: collecting images of urine red blood cells, white blood cells, calcium oxalate crystals and similar impurities under a microscope, and constituting a data set after professional physician labeling; performing a combined data enhancement operation on the data set, and completing data normalization; secondly, constructing a urine sediment open set recognition network based on a conditional variational autoencoder; setting a multi-constraint optimization objective function and network training parameters; then, obtaining a pre-training model, and further migrating the pre-training model to the urine sediment data set for training; finally, testing the model classification performance, and calculating the recognition accuracy. The application is mainly applied to the field of medical images and urine formed element testing scenes, and has high accuracy and good applicability.

The invention relates to the technical field of building material admixtures, and particularly discloses nano calcium carbonate, an alkaline residue-based solid waste cementing material early strength agent, a preparation method and application. The preparation method of the nano calcium carbonate comprises the following steps: carrying out reaction on alkaline residues and a chlorine-containing solution, and carrying out solid-liquid separation to obtain filtrate; and adding an alcohol solvent into the filtrate, introducing carbon dioxide and nitrogen to carry out carbonization reaction, and crystallizing to obtain the nano calcium carbonate. The growth process of the nano calcium carbonate crystals is controlled by controlling the carbonization reaction conditions and the flow of nitrogen and carbon dioxide, the method has the advantage of being easy to operate, and the prepared nano calcium carbonate is applied to the alkaline residue-based solid waste cementing material early strength agent; the strength, the initial setting time and the final setting time of the solid waste cementing material at each age can be improved, and a new idea is provided for preparation of the alkaline residue-based solid waste cementing material early strength agent.

The invention discloses a solid waste filling method based on cooperation of an MICP technology and carbon dioxide mineralization. Gangue aggregate is treated through microbial infiltration; cO2 is introduced into the alkaline solid waste for carbonation treatment, so that the alkalinity of the alkaline solid waste is reduced, and CO2 is absorbed and cured; the microbe modified aggregate and the mineralized solid waste slurry are fully mixed according to a reasonable ratio to form the filling slurry with stable performance. After the slurry is injected into the goaf, calcium carbonate is formed through induction of the MICP technology, calcium carbonate crystals are further generated, internal pores of the material are effectively filled, and the compactness and certain mechanical performance of the grouting body are enhanced. The method can synchronously and efficiently solve the problem of treatment of solid wastes such as coal gangue and fly ash, realizes large-scale storage of CO2, provides a filling body with excellent mechanical properties for a goaf, enhances the surface corrosion resistance and improves the bonding property with surrounding rock.

The invention relates to the technical field of calcium aspartate preparation, in particular to a high-purity and high-bulk-density calcium aspartate crystal and a preparation method and application thereof.The preparation method specifically comprises the steps that asparaginic acid and a calcium oxide solution are mixed according to the molar ratio of 2: 1, the pH value is adjusted to 6.5-7.0, after kieselguhr is added and filtered, the calcium aspartate crystal is obtained; adding calcium aspartate seed crystal liquid at 85-95 DEG C to induce crystallization, and cooling, centrifuging and drying to obtain the finished product. According to the method, the purity, bulk density and fluidity of the product are effectively improved and the moisture content is reduced through key technologies such as accurate pH control, induced crystallization by using activated seed crystal liquid and mother liquor regeneration and recycling; the obtained calcium aspartate crystal has bimodal particle size distribution, the loose bulk density reaches 0.5-0.65 g / mL, the tight bulk density reaches 0.75-1.05 g / mL, the water content is lower than 1.5%, the calcium aspartate crystal is suitable for various calcium fortified food and health care products such as tablets, capsules and solid beverages, and the method is simple in process, low in energy consumption and excellent in product performance and has good industrial application prospects.

The present disclosure relates to a calcium phosphate coating that includes a plurality of nanometer sized calcium phosphate crystals that form a single layer. The coating is on a surface of a conductive substrate and is about 1 to 1000 nanometers thick, and greater than 25 percent of the coated surface area comprises the single layer of the crystals.

The invention belongs to the technical field of batteries, and discloses a preparation method of a zinc-nickel secondary battery negative electrode active material. The preparation method comprises the following steps: adding ZnO into a KOH solution of saturated ZnO, uniformly mixing, adding Ca (OH) 2, reacting, and aging to obtain the negative active material of the zinc-nickel secondary battery. A hydrothermal coprecipitation method is adopted, used raw materials comprise calcium hydroxide, zinc oxide, potassium hydroxide and the like, and a calcium zincate crystal generated in the preparation process has a quadrilateral crystal form. The crystal form of calcium zincate can be effectively stabilized by controlling hydrothermal coprecipitation conditions. The solubility of the zinc oxide in an alkaline solution is low and is far lower than that of zinc oxide. And due to the characteristic, the concentration of zincate radicals in the electrolyte is remarkably reduced, so that the growth of negative electrode dendritic crystals is effectively inhibited, and the cycling stability and the service life of the zinc-nickel battery are further improved.

The invention relates to an earthen archaeological site loose soil body disease strengthening method, and relates to the field of archaeological site soil body protection and restoration. An earthen archaeological site loose soil body disease strengthening method comprises the following steps that a calcium hydroxide solution is injected into a loose soil body, and preliminary cohesive soil is obtained after standing; uniformly spraying a silicate solution on the surface of the primary binding soil, repeatedly spraying for three times, and standing to obtain binding soil; in-situ silty soil of loose soil is evenly sprayed on the surface of the binding soil, the binding soil is covered and then stricken off, and solidified soil is obtained after drying. A calcium hydroxide solution reacts with carbon dioxide to generate a calcium carbonate crystal'cementation bridge ', insoluble calcium salt is formed through ion exchange, a stable framework is built from the inside, and migration of soluble salt is inhibited; the silicate solution forms a silicon-oxygen network reinforcing film with stable chemical properties through a sol-gel reaction, external erosion is prevented, and meanwhile, the silicate solution and calcium carbonate crystals are interwoven to reinforce a structure; therefore, long-term influence of natural environment is effectively resisted, and soil strength is maintained.

The invention discloses an engineered exosome of LTH peptide modified miR-146a-5p and application, the core component of the medicine is the engineered exosome, and the engineered exosome is constructed by the following method: miR-146a-5p mimic infected human renal tubular epithelium HK2 cells with nucleotide sequences shown as SEQ ID NO.1-SEQ ID NO.2 are cultured and screened, the exosome rich in miR-146a-5p is separated from the culture supernatant of the cells, and the exosome rich in miR-146a-5p is obtained. Then, the kidney targeting peptide LTH is modified on the surface of the exosome. The invention reveals that HNRNP M protein is a key molecule for regulating and controlling miR-146a-5p to be sorted and enter the exosome for the first time, and verifies that the engineered exosome can be efficiently enriched in kidney, and by delivering miR-146a-5p to target IRAK1 gene in macrophage and inhibiting TRAF6 / IKK / NF-kappa B inflammation signal pathway, the macrophage is promoted to be polarized to a repairable M2 phenotype, so as to realize the purpose of improving the activity of the miR-146a-5p. And finally, the kidney injury induced by the calcium oxalate crystal is effectively relieved. The medicine has the advantages of clear mechanism, strong targeting property, good biocompatibility and the like, provides a brand new immunoregulation treatment strategy for renal injury, and has a wide clinical application prospect.

The invention discloses a method for preparing high-quality light calcium carbonate based on green liquid separation and impurity removal-crystal nucleus induction causticization granulation, and relates to the technical field of pulping and papermaking waste liquid treatment. According to the method, pulping black liquor is used as a raw material, calcium silicate is separated through fractional precipitation, granular calcium carbonate crystals are generated through crystal nucleus induction causticization reaction, and high-quality light calcium carbonate is prepared through multi-stage purification. The content of calcium carbonate prepared by the method can reach 98-99.5% of the purity of industrial calcium carbonate, the purity of calcium silicate byproducts is greater than or equal to 90%, the calcium silicate byproducts can be directly used for roadbed materials or cement retarders, the recovery rate of sodium hydroxide in the black liquor is greater than or equal to 92%, and resource utilization is realized.

The application discloses a method for testing anti-radiation damage performance of calcium fluoride crystal. The method adopts X-ray radiation to irradiate calcium fluoride crystal, and judges the anti-radiation damage performance of the crystal according to an X-ray radiation dose for inducing color center absorption peak of the calcium fluoride crystal and a color center absorption coefficient of a characteristic absorption peak induced by radiation.

This invention provides a method for microbial soil nailing slope reinforcement based on microbial-induced calcium carbonate precipitation, belonging to the field of geotechnical engineering technology. The invention involves drilling holes in the slope surface and filling these holes with calcareous sand. A slurry containing urease-producing bacteria is injected into the calcareous sand-filled holes, and the mixture is allowed to stand. Then, a cementing liquid is injected to induce microbial calcium carbonate precipitation, resulting in a microbial soil nailed slope reinforcement. This invention creatively combines MICP technology with soil nail structure, using MICP technology to replace traditional cement grouting. This generates calcium carbonate crystals that cement the calcareous sand and surrounding soil, reducing the swelling and shrinkage of expansive soil under rainwater conditions. It inhibits slope surface collapse under alternating wet and dry conditions and reduces the possibility of shallow landslides during these processes. Simultaneously, it improves the shear strength and pull-out resistance of the nail-soil interface, reducing environmental pollution.

The present application relates to a method for regulating the growth of calcium carbonate crystals into calcite by glucose uronic acid, so as to improve the mechanical strength of the solidified body. The specific steps of the method are as follows: (1) screening and identification of acetate mineralization bacteria with calcium acetate as substrate; (2) culture of carbonate mineralization strain; (3) growth and regulation of calcium carbonate crystals induced by microorganisms; (4) characterization of calcium carbonate crystals. The microbial solidification of the uranium tailings beach is a green solidification method with great application prospect. The carbonate mineralization strain provided by the present application has no secondary pollution in the process of microbial induction of calcium carbonate precipitation, has strong environmental friendliness, and can regulate the growth of calcium carbonate crystals into calcite by glucose uronic acid, so as to improve the mechanical strength of the calcium carbonate crystals, and has potential application prospect.

The invention discloses a grading ultrasonic induction calcium fluoride crystallization process and equipment used in the grading ultrasonic induction calcium fluoride crystallization process, and the equipment comprises a wastewater adjusting tank, a lime solution blending tank, an ultrasonic induction crystal nucleus generator, an ultrasonic induction crystal grower, a crystal collecting tank, a dehydration system, a comprehensive wastewater defluorination system, a dosing pump, a wastewater lifting pump and a control system, part of the high-concentration acidic fluorine-containing wastewater and the lime solution are crystallized in the ultrasonic induced crystal nucleus generator to form crystal nucleuses; the crystal nucleus enters an ultrasonic induction crystal grower along with the effluent, crystals generated by reaction of the residual high-concentration acidic fluorine-containing wastewater and the lime solution in the ultrasonic induction crystal grower grow on the surface of the crystal nucleus, and large-particle calcium fluoride crystals are dehydrated to form a calcium fluoride crystal product; according to the method, the dissolution and use efficiency of lime can be improved, the purity of calcium fluoride can be improved, the nucleation and growth process of calcium fluoride can be controlled, and therefore the particle size of calcium fluoride crystals can be effectively controlled.

The application provides a landslide rock mass crack repair device and method based on calcium carbonate precipitation, and belongs to the technical field of geotechnical engineering geological disaster prevention and control. The device integrates precise grouting, precipitation regulation, mechanical monitoring, dry-wet cycle simulation module and intelligent control terminal, adopts a degradable multi-stage telescopic grouting pipe, combines electric field, pH and temperature for precise regulation to realize directional precipitation of calcium carbonate crystals, and is matched with multiple types of sensors to complete real-time monitoring of all parameters in the repair process. The method configures MICP / EICP precursor liquid according to the rock mass lithology, and completes the repair through the steps of crack survey, environment calibration, precursor liquid mixing, precise grouting regulation, simulation maintenance and effect evaluation, and is suitable for different scenes such as reservoir area, mountain area, mining area and high altitude. The application realizes intelligent and quantitative evaluation of the repair process, can improve the compressive strength and shear strength of the rock mass, is convenient to construct and has little disturbance to the original rock mass, the long-term mechanical stability of the repaired rock mass is excellent, and is suitable for various landslide rock mass crack repair projects.

The invention discloses a calcium-based microporous carbon fiber carton board, a formula and a preparation method. The calcium-based microporous carbon fiber carton board is prepared from macromolecular calcium crystal master batches and carbon fiber powder in a mass ratio of (10: 1)-(3: 1), wherein the high-molecular calcium crystal master batch comprises calcite as a base material; adding a base material and an auxiliary agent; the mass ratio of the calcite to the base material to the auxiliary agent is (67%-84%): (15%-30%): (1%-3%). The preparation method comprises the following steps: pretreating each raw material; weighing the raw materials according to a preset proportion; putting the raw materials into a high-speed hot mixing machine to form a first pretreated material; putting the first pretreated material into a low-speed cold mixer to form a second pretreated material; and carrying out extrusion molding, cutting and packaging on the basis of the second pretreated material. The composite material is excellent in mechanical property, good in forming stability and wide in application prospect.

The invention discloses a stable preparation method of an unsteady vaterite calcium carbonate crystal, and belongs to the technical field of inorganic material preparation. According to the method, gamma-dicalcium silicate (gamma-C2S) is taken as a slow-release calcium source, amino acid is taken as a crystal form regulating agent, CO2 is introduced into a system at normal temperature and normal pressure for a carbonization reaction, and an unstable state reaction environment of instantaneous supersaturation-dynamic passivation-heterogeneous adsorption is constructed, so that controllable nucleation of vaterite is realized, and transformation of vaterite to calcite is remarkably inhibited. Optionally, gypsum powder can be added as a crystal form stabilizer, and the stability of vaterite is further enhanced through heterogeneous adsorption. The process is simple, green and energy-saving, and the obtained vaterite calcium carbonate crystal is high in purity, regular in morphology and excellent in long-term stability in water, and is suitable for the fields of carbon mineralization carbon sequestration, functional fillers, low-carbon building materials and the like.

The application relates to the field of self-repairing concrete, in particular to high-strength self-repairing concrete and a preparation method thereof. The high-strength self-repairing concrete comprises the following substances in parts by weight: cement 45-60 parts; recycled coarse aggregate 100-120 parts; fine aggregate 65-80 parts; water 10-20 parts; water reducing agent 0.1-0.3 parts; the recycled coarse aggregate is a recycled coarse aggregate with immobilized self-repairing microorganisms, and the self-repairing microorganisms comprise at least one of bacillus subtilis, bacillus megaterium and bacillus pasteurii. The application endows the concrete with crack self-repairing capability by immobilizing the self-repairing microorganisms. The microorganisms form dormant spores in the concrete, when cracks are generated and infiltrate water, the microorganisms are activated and metabolize calcium sources and urea in the surrounding environment, calcium carbonate crystals are generated through a microbial-induced carbonate precipitation mechanism, cracks are filled and structural integrity is restored. The process does not require external intervention and can significantly prolong the mechanical structure and mechanical properties of the concrete structure.

The application discloses a method for efficiently preparing beta-amino propionic acid calcium from beta-amino propionitrile, and comprises the following steps: beta-amino propionitrile and a calcium salt solution are reacted in the presence of a catalyst and an additive, and microwave radiation is used to promote the reaction; after the reaction solution is filtered and deaminated, the solution is concentrated, cooled and alcohol crystallized to obtain beta-amino propionic acid calcium crystals which can be used for the production of calcium pantothenate; wherein the catalyst is a transition metal complex, and the additive is a phase transfer catalyst or a buffer metal salt. The application has the advantages of simple process, high yield and high reaction efficiency.

The present invention relates to a method for extracting and preparing D-pantothenate calcium from a biological fermentation broth, the method comprising: first using a ceramic membrane and an ultrafiltration membrane to filter and remove mycelium and other solids in the D-pantothenate calcium fermentation broth; then using a cation exchange resin (transformed into a hydrogen type) to remove the pigment and salt in the D-pantothenate calcium fermentation broth and converting D-pantothenate calcium into D-pantothenic acid, and then the fermentation broth passes through an anion exchange resin (transformed into a hydroxyl type), and D-pantothenic acid is adsorbed on the resin and parsed using a calcium chloride solution to obtain a purified D-pantothenate calcium solution; the D-pantothenate calcium solution is concentrated by nanofiltration and decolorized with activated carbon, and then D-pantothenate calcium crystals are obtained by adding methanol. The extraction and preparation method of the present invention has simple process design, high yield, excellent product quality and is suitable for industrialization and promotion.

The invention relates to the technical field of cutting equipment, and discloses a calcium fluoride crystal processing efficiency and damage depth coordinating device which comprises a workbench and further comprises a U-shaped frame, and the two vertical edges of the U-shaped frame are fixedly installed at the top of the workbench; the transverse plate is horizontally arranged between the upper part of the workbench and the transverse edge of the U-shaped frame; the cutting assembly is arranged on the transverse plate, and the cutting assembly is used for cutting the calcium fluoride crystals; and the control assembly is arranged on the transverse plate, and the control assembly is used for controlling the cutting assembly, so that the calcium fluoride crystals cannot be overheated and damaged when the cutting assembly cuts the calcium fluoride crystals. According to the calcium fluoride crystal cutting device, the cutting disc moves up and down in a reciprocating mode to cut calcium fluoride crystals, namely, high-speed airflow is automatically formed to cool and clean kerfs of the calcium fluoride crystals and the cutting disc while the cutting disc moves upwards, the cutting smoothness and stability are guaranteed, and then the using effect of the device is improved.

The present invention discloses a class of citric acid series carbon dots and their application in the preparation of calcium crystal inhibitors. The citric acid series carbon dots are carbon dots obtained by chemically synthesizing citric acid series substances. The citric acid series carbon dots of the present invention have the advantages of good water solubility, good stability, low biological toxicity, and renal clearance. Therefore, they can replace common organic small molecule acids with poor stability, high biological toxicity, and difficult metabolism to regulate the crystallization process of calcium oxalate crystals. Such carbon dots can not only promote the transformation of calcium oxalate monohydrate crystals into calcium oxalate dihydrate crystals that are easier to excrete from the body, but also inhibit the growth of calcium oxalate crystals, reducing their average crystal grain size by 20%. At the same time, through the renal clearance mechanism of carbon dots, the fluorescence in urine can be used to study their metabolism in the body. Such carbon dots show great application potential in the treatment of calcium oxalate stones.

This invention relates to the field of road engineering, specifically to a process for constructing a road without a subbase using refined slag and converter slag. The process involves crushing converter slag as the skeleton aggregate and mixing it with refined slag as the fine aggregate. Pasteurella multocida inoculum solution and a cementing solution containing soluble calcium salts and urea are alternately sprayed into the mixture in stages and mixed. After paving, compaction, and curing, the mixture is covered and left to stand. Microbial metabolism generates calcium carbonate crystals in situ at the contact points between steel slag particles, forming a microscopic cementing network. This process, through in-situ mineralization and physical coating, blocks the contact between free calcium oxide and moisture inside the converter slag, eliminating local expansion stress caused by delayed hydration of free calcium oxide in the subbase structure, preventing the expansion and fracture of microcracks within the base layer, and cementing the steel slag mixture into a monolithic load-bearing slab.

This invention discloses a stable preparation method for unsteady aragonite calcium carbonate crystals, belonging to the field of inorganic material preparation technology. The method uses γ-type dicalcium silicate (γ-C2S) as a slow-release calcium source and amino acids as crystal form regulators. CO2 is introduced into the system at room temperature and pressure to initiate a carbonization reaction. By constructing an unsteady reaction environment of "instantaneous supersaturation-kinetic passivation-heterogeneous adsorption," controllable nucleation of aragonite is achieved, and its transformation to calcite is significantly inhibited. Optionally, gypsum powder can be added as a crystal form stabilizer to further enhance the stability of aragonite through heterogeneous adsorption. This invention features a simple, green, and energy-saving process, yielding aragonite calcium carbonate crystals with high purity, regular morphology, and excellent long-term stability in water. It is suitable for applications such as carbon mineralization and carbon fixation, functional fillers, and low-carbon building materials.

The application discloses a method for synchronously removing calcium and phosphorus in industrial circulating cooling water, which comprises the following steps: adding sodium bicarbonate into a solution containing calcium ions to which a scale inhibitor is added; passing oxygen into the solution so that the solution is in an oxygen saturation state; taking a carbon-based TiO2 electrode as a working electrode, a graphite electrode as a counter electrode, and a silver chloride standard electrode as a reference electrode, applying a voltage through an electrochemical workstation to electrochemically treat the solution, continuously passing oxygen in the whole process, and generating white precipitates in the solution after the reaction is completed; and realizing the synchronous removal of calcium and phosphorus by filtering and drying the white precipitates. The method can induce the release of calcium and phosphorus in the industrial circulating cooling water and induce the generation of calcium phosphate crystals, so that the synchronous Ca removal and P recovery are realized, and phosphorus fertilizer is provided for agricultural production. The method provides an environment-friendly and potentially economically valuable new idea for the repair of the industrial circulating cooling water.

The invention discloses a step-by-step recovery treatment method and system for mixed wastewater of sulfuric acid and fluosilicic acid, which comprises the following steps: adding a lime solution into a desulfurization induced crystallization reactor to adjust the pH value of the wastewater to 1.5-3, combining sulfate radicals in the wastewater with calcium to form calcium sulfate crystals, and carrying out filter pressing to obtain a calcium sulfate product with higher purity; the effluent of the desulfurization induced crystallization reactor enters a defluorination induced crystallization reactor, a lime solution is added to adjust the pH value of the wastewater to 4-5, calcium ions and fluorine ions in the wastewater are combined to form calcium fluoride crystals, the calcium fluoride crystals are subjected to multi-stage cleaning and filter pressing to obtain a calcium fluoride product with high purity, and the effluent of the defluorination induced crystallization reactor is subjected to up-to-standard treatment. According to the method, the pH value of a reaction system is precisely regulated and controlled in stages, so that more than 98% of fluorine ions are deeply removed, meanwhile, a high-purity calcium sulfate product and a high-quality calcium fluoride product are produced, and resource recycling of core resources of sulfur and fluorine in the wastewater is really achieved.