75 results about "Hydrogen-Ion Concentrations" patented technology

The invention relates to the technical field of water quality regulation and control, in particular to a mung bean sprout cultivation water quality dynamic regulation and control method and system.The mung bean sprout cultivation water quality dynamic regulation and control method comprises the following steps of collecting a rhizosphere and main water body conductivity time sequence, analyzing an extreme point lag difference, recognizing an absorption active stage, dynamically adjusting a pH set value and evaluating regulation and control response stability; a liquid injection trigger threshold value is optimized according to the conductivity slope ratio, and a water quality regulation and control result is output. According to the method, conduction delay between conductance signals can be recognized in real time by collecting rhizosphere liquid phase and main water body conductivity time sequence data and constructing change slope and lag difference data, and therefore the active absorption stage of the rhizosphere of the mung bean sprouts is extracted. A stable trend label can be constructed according to the judgment of the continuity and the change direction of the absorption stage, so that the regulation and control basis has more physiological correlation. In the aspect of pH control, a hydrogen ion concentration regulation target and exponential response logic are introduced to realize dynamic convergence of an acid-base balance control target, so that a regulation result is closer to an absorption state.

The invention relates to the technical field of batteries, in particular to an all-vanadium redox flow battery SOC dual monitoring correction method and system. The method comprises the following steps: acquiring first SOC data through potential monitoring, wherein the first SOC data comprises a positive charge-discharge state SOC positive, n and a negative charge-discharge state SOC negative, n; second SOC data including SOC positive ', n and SOC negative', n are obtained through electrolyte valence state concentration monitoring; calculating correction coefficients kappa positive and kappa negative according to the first SOC data and the second SOC data; and finally, correcting the third SOC data by using the correction coefficient to obtain an actual SOC value. According to the method, a dual monitoring mode is adopted, the real-time online characteristic of potential monitoring is utilized, the high-precision advantage of electrolyte concentration monitoring is combined, the two monitoring methods are organically combined through a correction coefficient, and the problems that single potential monitoring is affected by hydrogen ion concentration and the electrolyte concentration monitoring cannot realize real-time online monitoring are solved. According to the method, the correction frequency of 0-10 days is designed, the correction timeliness and sampling interference are reasonably balanced, and the accuracy of SOC monitoring is improved.

The invention relates to the technical field of non-ferrous metal hydrometallurgy, in particular to a method for separating molybdenum and rhenium from molybdenum smelting waste acid by using resin, which comprises the following steps: adding a phosphorus source into the molybdenum smelting waste acid, and then adjusting the acidity to an acid environment in which the hydrogen ion concentration is greater than or equal to 1mol / L; molybdenum and rhenium in the molybdenum smelting waste acid with the acidity adjusted are separated through weak-base anion exchange resin, and a rhenium product with the lower molybdenum impurity content is obtained. According to the method, the phosphorus source is added into the molybdenum smelting waste acid, so that phosphate ions are hydrolyzed from the phosphorus source, molybdenum can be effectively prevented from being adsorbed by the alkalescent anion exchange resin, the selectivity of the anion exchange resin to rhenium is greatly improved, and the rhenium recovery rate and the molybdenum-rhenium separation effect are improved; the problems that in the prior art, ion exchange resin is difficult to adapt to molybdenum-rhenium separation under the high molybdenum concentration, the rhenium recovery rate is low, the rhenium-molybdenum separation effect is poor, and a high-molybdenum-concentration solution cannot be treated are solved.

The invention relates to a flow battery hydrogen evolution reaction real-time monitoring method and system, and the method comprises the steps: obtaining real-time data in a battery management system; calculating the hydrogen ion concentration in the positive electrode electrolyte in the flow battery by adopting a simultaneous equation; according to the hydrogen ion concentration in the positive electrode electrolyte, the negative electrode equilibrium mixed potential is calculated by combining the positive electrode equilibrium potential; calculating the equilibrium potential of the negative electrode hydrogen evolution reaction according to the negative electrode equilibrium mixed potential; calculating the hydrogen ion concentration in the negative electrode electrolyte according to the equilibrium potential of the negative electrode hydrogen evolution reaction; calculating the amount of substance of hydrogen ions for hydrogen evolution according to the concentration of the hydrogen ions in the negative electrode electrolyte and a simultaneous equation; the amount of substance in which hydrogen is precipitated is calculated on the basis of the amount of substance of hydrogen ions for hydrogen precipitation. An electrochemical calculation formula is established through BMS real-time data, a gas concentration sensor does not need to monitor the gas phase concentration, the cost is reduced, meanwhile, the system real-time performance is improved, the monitoring result is not influenced by working condition fluctuation, and the data reliability is improved.

The invention relates to the technical field of waste hydrogenation catalyst treatment, and discloses a recovery method of active metal in a waste hydrogenation catalyst, a preparation method of a residual oil hydrogenation catalyst and application of the residual oil hydrogenation catalyst, and the method comprises the following steps: (1) leaching the waste hydrogenation catalyst by using an acid solution to obtain a leachate; (2) the concentration of hydrogen ions in the leachate is adjusted to be 0.05-2 mol / L, then the leachate is in contact with a first extraction agent, washing and reverse extraction are conducted, and a Mo solution is obtained; (3) adjusting the pH value of the first raffinate to 1-2.1, then contacting the first raffinate with a second extraction agent, and then carrying out washing and reverse extraction to obtain an Al solution; and (4) adjusting the pH value of the second raffinate to 2.2-3.5, then contacting the second raffinate with a third extraction agent, and then carrying out washing and reverse extraction to obtain a Ni and / or Co solution. The method can realize hazardous waste resource utilization, and can significantly reduce the production cost of the hydrogenation catalyst.

The invention relates to the technical field of wastewater treatment, in particular to a multi-stage treatment method and system for lead smelting wastewater. The method comprises the following steps: acquiring water quality data of the multi-source lead-acid storage battery smelting wastewater, and based on the water quality data, analyzing to obtain a battery wastewater multiphase feature set; on the basis, the information of the stabilized intermediate water body is obtained by dynamically adjusting the hydrogen ion concentration, breaking a complexing structure and preferentially separating fluoride; on the basis, the antimony valence state and the antimony concentration are monitored in real time, the oxidizing agent type and the reaction intensity are matched in a self-adaptive mode, oriented efficient conversion of antimony is achieved, and low-antimony pre-sedimentation water outlet information is obtained; on the basis, according to the dynamic proportion of the inlet water hydrogen ion concentration to the lead and antimony ions, a precipitation path control instruction is automatically switched, a purified water body with lead and antimony synchronously and deeply removed is obtained, and a lead smelting wastewater multi-stage treatment log is output. Harmful pollutants in the lead smelting wastewater process are efficiently removed, the method adapts to water quality fluctuation, consumption reduction and cost saving are achieved, compliance treatment of wastewater is achieved, and environment-friendly and economic values are achieved.

Provided are a method and a system for producing calcium carbonate, in which a content of alkali in calcium carbonate obtained using a calcium-containing waste can be controlled. There is provided a method (system) for producing calcium carbonate from a calcium-containing waste, including: a calcium dissolution step of adding aqueous hydrochloric acid to a calcium-containing waste and dissolving calcium to produce an aqueous solution containing a calcium ion; a separation step of adjusting a hydrogen ion concentration index of the aqueous solution containing a calcium ion and separating Mg and the like from the aqueous solution; a calcium carbonate preparation step of producing calcium carbonate by adding an aqueous solution containing potassium carbonate and / or sodium carbonate to the calcium ion-containing aqueous solution obtained in the separation step to cause a reaction to occur, in which in the calcium carbonate preparation step, an addition rate of the aqueous solution containing potassium carbonate and / or sodium carbonate is controlled such that κ represented by a specific expression is 3000 or lower.

There is provided a composition for a semiconductor process, the composition comprising silica particles, and the composition having a value of 6.30% to 9.60% according to Formula 1. Further, a composition for a semiconductor process is provided, the composition comprising silica particles, and having a value of greater than 5.80% and less than 8.80% according to Formula 2. Further, provided is a method for preparing a composition for a semiconductor process, the method comprising: a step (a) of stirring an aqueous dispersion solution of silica having a hydrogen ion concentration (pH) in the range of 4.0 to 5.5; a step (b) of introducing a silica surface modifier containing an aminosilane component when the temperature of the aqueous silica dispersion solution is 25 DEG C or more and less than 40 DEG C; (c) introducing a hydrogen ion concentration (pH) regulator into the aqueous silica dispersion solution into which the silica surface modifier has been introduced; and (d) stirring the aqueous silica dispersion solution into which the hydrogen ion concentration (pH) regulator has been introduced so that the final reaction temperature is within the range of 50 DEG C to 65 DEG C. Further, a method of manufacturing a semiconductor device using the composition for a semiconductor process is provided.

The application provides a magnetic field synergistic regulation reinforced micro-electrolysis sewage treatment method and equipment, which comprises the following steps: adjusting the hydrogen ion concentration index of sewage to obtain adjusted sewage, pumping the adjusted sewage to the water inlet of a micro-electrolysis reaction tower by using a lifting pump, making the adjusted sewage pass through the aeration device of the aeration area to be aerated, and then entering the micro-electrolysis reaction tower through a supporting layer; the magnetic field generating device is composed of the enameled copper wire coil wound outside the micro-electrolysis reaction tower and the iron-carbon micro-electrolysis filler in the tower, a magnetic field is formed in the micro-electrolysis reaction tower, and the size and direction of the magnetic field are adjusted in real time according to the water quality of the effluent; the adjusted sewage treated by the magnetic field is overflowed to the water collecting tank through the trapezoidal overflow weir, the water quality of the effluent is detected in real time by the online water quality monitoring system below the effluent outlet; the hydrogen ion concentration index of the inlet water, the magnetic field parameters and the aeration amount are adjusted in linkage to regulate the micro-electrolysis reaction conditions. The application improves the automation level and treatment efficiency of sewage treatment.

The invention relates to the technical field of data analysis, and particularly discloses a data analysis method and system based on environmental monitoring, and the method comprises the following steps: S1, dividing a test field into sampling areas with the same area, collecting a soil sample with a specified volume, and preparing a soil buffer solution; s2, measuring the pH value of a soil buffer solution, calculating the concentration of a hydrogen ion buffer solution, screening an acidification area, calculating an acidification ratio, and calculating the average hydrogen ion concentration; s3, preparing a substrate solution, calculating the light transmission ratio of the substrate solution, obtaining the mean value of the light transmission ratio, calculating the urease activity coefficient, calculating the comprehensive fertilization coefficient, and adjusting the fertilization amount of the nitrogen fertilizer according to the comprehensive fertilization coefficient. The invention provides a method for judging whether the nitrogen fertilizer is overused or not according to the enzyme activity in the soil, so that the dynamic adjustment of the fertilizing amount of the nitrogen fertilizer is realized, the waste of nitrogen fertilizer resources is reduced, the resource utilization rate is improved, and the pollution to the environment is reduced.

The application relates to the technical field of electrochemical detection, and specifically discloses an ammonium sulfate PH calculation method based on an electrochemical principle and a temperature compensation technology, which comprises the following steps: collecting a non-standard state electrode potential signal and an NTC thermistor real-time resistance signal of an ammonium sulfate solution to be measured; using an improved temperature fitting algorithm based on a temperature-resistance nonlinear relationship and an optimized fitting process to convert an actual thermodynamic temperature of the solution; combining the actual thermodynamic temperature to compensate the non-standard state electrode potential signal, eliminating the interference of temperature change on the potential measurement; and substituting the compensated electrode potential value and the thermodynamic temperature into a simplified expression of the Nernst equation to inversely solve the hydrogen ion concentration, and then obtaining the final PH value of the ammonium sulfate solution through negative logarithm operation. The method optimizes the temperature fitting precision and the electrode potential compensation adaptability, and improves the PH measurement deviation problem of the ammonium sulfate solution.

The present application relates to the technical field of pollution detection, in particular to a water body heavy metal chromium pollution detection method and system, the method comprising the following steps: obtaining the concentration of water body dissolved organic matter, hydrogen ion concentration, oxidation-reduction potential, temperature and initial hexavalent chromium concentration and normalizing, determining the reduction reaction rate constant according to the temperature and oxidation-reduction potential, predicting the reduction rate of hexavalent chromium, the theoretical reduction amount and the theoretical residual concentration, collecting the online electrochemical concentration and the unmanned aerial vehicle hyperspectral inversion concentration and performing difference verification, respectively correcting the electrochemical concentration and the hyperspectral concentration when there is data contradiction, and fusing the two types of correction results to judge the pollution state. In the present application, by establishing a hexavalent chromium natural evolution reference and combining multi-source observation consistency verification, the electrochemical underestimation caused by organic matter passivation and the hyperspectral overestimation caused by spectral background are identified, compensation correction and background stripping are completed, and the accuracy and reliability of chromium pollution detection in complex water bodies are improved.

A dynamic optimization method for acid-to-ore ratio in high-pressure leaching of laterite nickel ore includes: obtaining a feed ore composition, a pulp concentration, a pulp flow rate, a leaching temperature and a pulp duration time in an autoclave, and setting a target leaching rate of nickel; setting a flow rate of sulfuric acid; obtaining a relationship between a hydrogen ion concentration in a solution and a reaction time; obtaining a theoretical leaching rate of nickel when a leaching time reaches the pulp duration time in the autoclave; comparing the theoretical leaching rate of nickel with the target leaching rate of nickel; adjusting the set flow rate of the sulfuric acid until the theoretical leaching rate of nickel is equal to the target leaching rate of nickel, calculating a corresponding optimal acid-to-ore ratio; and adjusting an opening degree of a sulfuric acid flow regulating valve of the autoclave.

A method for calculating the open circuit voltage of an all-vanadium liquid flow battery is disclosed. In the method, based on the Nernst equation, a relationship between the open circuit voltage and the state of charge of the all-vanadium liquid flow battery is established, and a correction coefficient related to the electrolyte flow rate is added; the electrolyte flow rate is fixed, the battery is charged and discharged, and the relationship curve between the open circuit voltage and the state of charge under the flow rate is obtained experimentally; based on the experimental results, each correction coefficient is identified using a genetic algorithm; the electrolyte flow rate is changed multiple times, and a polynomial is used to fit the relationship between each correction coefficient and the electrolyte flow rate. For a specific liquid flow battery, the above steps are completed in sequence to obtain a complete open circuit voltage calculation method. The correction coefficient of the all-vanadium liquid flow battery open circuit voltage calculation method is related to the electrolyte flow rate, and the influence of the hydrogen ion concentration that is difficult to accurately calculate is taken into account. It is close to the facts of the electrochemical reaction and takes into account the calculation accuracy, which has important basic significance for the modeling of all-vanadium liquid flow batteries.

The application belongs to the technical field of medical isotope production, and relates to a recovery and purification method of a target material, in particular to a recovery and purification method of a nickel target material in a Cu-64 preparation process. An acid is added to a recovered nickel solution in the Cu-64 preparation process to adjust the hydrogen ion concentration to 6-8 mol / L, so as to obtain an acidic nickel solution; a TK201 resin is used to perform one-column separation on the acidic nickel solution, so as to obtain effluent; and an AGMP-1 resin is used to perform two-column separation on the effluent, so as to obtain a recovered and purified nickel solution. The recovery and purification method can significantly reduce Cu, Co and other impurities, greatly improve the purity of nickel in the recovered nickel target material, and has a high nickel recovery rate.

Provided is a method for producing a lithium-containing solution that allows suppressing production cost for lithium production by increasing a lithium content rate in a solution after an eluting step, and suppressing amount of a solution used in a process after the eluting step. The method for producing a lithium-containing solution includes an adsorption step, an eluting step of bringing post-adsorption lithium manganese oxide into contact with an acid-containing solution to obtain an eluted solution, and a manganese oxidation step performed in this order. The eluted solution is separated into a high concentration lithium-eluted solution and a low concentration lithium-eluted solution. The acid-containing solution includes a solution prepared by adding acid to the low concentration lithium-eluted solution. With this aspect, since only the low concentration lithium-eluted solution is added to the acid-containing solution, a hydrogen ion concentration in the acid-containing solution can be increased by adding just a small amount of acid, which consequently allows suppressing amount of the acid-containing solution and allows suppressing amount of the eluted solution used in the manganese oxidation step.

The present invention discloses a method for dynamically optimizing the acid-to-ore ratio in the high-pressure leaching of laterite nickel ore, which includes obtaining the ore composition, pulp concentration, pulp flow rate, leaching temperature, and residence time of the pulp in the autoclave, and setting the target leaching rate of nickel; setting the flow rate of sulfuric acid; obtaining the hydrogen ion concentration in the solution; obtaining the theoretical leaching rate of nickel when the leaching time reaches the residence time of the pulp in the autoclave at the current sulfuric acid flow rate; and comparing the size of the theoretical leaching rate of nickel with the target leaching rate of nickel. The beneficial effects of the technical solution proposed by the present invention are: providing a high-pressure acid leaching mathematical model for the leaching of laterite nickel ore and an optimal acid-to-ore ratio calculation method. By inputting the real-time ore composition into this high-pressure acid leaching mathematical model, the optimal acid-to-ore ratio can be calculated, so that the sulfuric acid addition flow rate in the high-pressure leaching link of laterite nickel ore can be dynamically adjusted according to the ore composition, making the high-pressure acid leaching process always in the dynamically optimal state of the optimal acid-to-ore ratio.

The microelectrode array comprises a plurality of microelectrode cells, the microelectrode cell comprises a working electrode and a counter electrode, and the counter electrode generates alkaline ions to neutralize hydrogen ions generated by the working electrode. A simulation method for synthesizing DNA by using a microelectrode array comprises the following steps: establishing a three-dimensional model of the microelectrode array by using multi-physical field simulation software, and solving and calculating a physical field to obtain a calculation result; and post-processing the calculation result, and creating a drawing group about the hydrogen ion concentration. According to the microelectrode array and the simulation method of the synthesized DNA of the microelectrode array, the counter electrode is added into the microelectrode array, hydrogen ions generated by the working electrode are neutralized through basic ions generated by the counter electrode, crosstalk of the hydrogen ions is avoided, modeling analysis is conducted on the crosstalk condition of the hydrogen ions generated by the working electrode through multi-physics field simulation software, and the simulation result of the synthesized DNA of the microelectrode array is obtained. And theoretical guidance is provided for high-throughput synthesis of different types of DNA.

A composite green pickling material and its usage method belong to the technical field of pickling materials. The raw materials include 5-15 wt% of organic sulfonic acid, 3-8 wt% of phosphoric acid, 1.9-9.6 wt% of pickling accelerator, and the balance of water. The organic sulfonic acid can provide a large amount of free hydrogen ions, while phosphoric acid utilizes its special ternary acid buffer structure, and phosphate ions slowly release free hydrogen ions to buffer the excessive free hydrogen ion concentration in the pickling material, which can control and stabilize the pickling speed of the pickling solution, is beneficial to controlling the pickling degree, can protect the base metal, avoid the corrosion of the base material, greatly extends the service life of the pickling material, can disperse free hydrogen ions more evenly, avoid the corrosion of the base material caused by the accumulation of hydrogen ions in the exposed area of the base material, does not contain volatile strong acids, has little corrosion to the environment, and is green and environmentally friendly.

This invention discloses a method and system for the harmless treatment and beryllium ultrastable mineralization of lithium slag through agent-slag synergy, belonging to the field of solid waste treatment technology. It includes: dissolving active silica-alumina excitation components according to mineral diagnostic data to obtain a structural excitation liquid; simultaneously activating the lithium slag and the excitation liquid through mechanochemical processes, reconstructing the interface of the adsorbed excitation components, and generating a modified lithium slag matrix; preparing a mineralization assembly liquid based on the beryllium exposure of the matrix; introducing the assembly liquid into the matrix in a segmented gradient, controlling the hydrogen ion concentration to induce in-situ crystallization at the interface, and obtaining a primary stabilizer; pressing the stabilizer and placing it in an alternating electromagnetic field coupled with an endogenous exothermic environment to generate beryllium ultrastable mineralization products. This invention employs a comprehensive treatment method combining deep mechanochemical simultaneous activation and exposure with slow-release ion in-situ crystallization and endogenous thermomagnetic coupling to drive ordered cross-linking of the microstructure. This method can destroy the dense inert framework of the waste slag and forcibly drive the migration and trapping of heavy metals, ultimately achieving deep ultrastable mineralization and seepage prevention of beryllium toxic ions.

The utility model discloses a rainwater acidity and alkalinity detection device for environment detection, which relates to the technical field of rainwater acidity and alkalinity detection equipment, and comprises a collecting barrel, a flow guide cover movably connected to the top of the collecting barrel, a mounting ring fixedly connected in the collecting barrel, a clamping seat movably connected to the top of the mounting ring, and positioning components symmetrically mounted at the bottom of the clamping seat. Fixing columns are symmetrically and fixedly connected to the top of the clamping seat, fixing assemblies are mounted in the fixing columns, a mounting groove is formed in the inner wall of the clamping seat, a filter paper funnel is movably connected into the mounting groove, and a PH sensor is mounted on the inner wall of the collecting cylinder. By the adoption of the structure, solid impurities in rainwater can be effectively filtered out, the impurities are prevented from being attached to the surface of the pH sensor and disturbing accurate sensing of the pH sensor on the concentration of hydrogen ions in the rainwater, the filter paper funnel can be disassembled and assembled without complex steps and tools, the time needed for replacing the filter paper is greatly shortened, and the cost is reduced. And the working efficiency is improved.

The application provides a nickel solution preparation on-line monitoring system and method, and belongs to the technical field of non-ferrous hydrometallurgy; the system comprises a waste liquid receiving tank, an acid adjusting tank, a hydrogen ion on-line detection device and a controller; the hydrogen ion on-line detection device monitors the hydrogen ion concentration of a key area in real time; the controller automatically adjusts the adding amount of acid liquid and fresh water according to the detection signal, and controls the outlet flow in linkage, so that full-automatic acid adjusting and solution preparation are realized. The application can solve the problems of high labor intensity, low precision and poor safety of manual acid adjusting, realize accurate control of the hydrogen ion concentration, improve the qualified rate of acid adjusting, and thus improve the solution preparation efficiency and product quality.

The invention provides a method for recovering indium and bismuth from waste, and relates to the technical field of non-ferrous metal hydrometallurgy. The invention discloses a method for recovering indium and bismuth from waste materials. The method comprises the following steps that mixed waste materials containing indium and bismuth are obtained; adjusting the concentration of hydrogen ions in the mixed waste to a first concentration, carrying out primary agitation leaching, and separating to obtain a first-section leaching solution and first-section leaching residues; carrying out oxidation impurity removal treatment on the first-section leaching solution to remove first impurity ions in the first-section leaching solution, so as to obtain a purified solution; through metal replacement, indium ions in the purified liquid are subjected to metal replacement treatment, and crude indium is obtained; mixing the first-stage leaching residues, an acid leaching agent and a first oxidizing agent, carrying out secondary agitation leaching, and separating to obtain a second-stage leaching solution; and hydrolyzing the second-stage leachate, and separating to obtain a bismuth salt precipitate. According to the method, the indium recovery rate is greater than or equal to 98%, the bismuth recovery rate is greater than or equal to 95%, the refined indium grade is greater than or equal to 99.998%, and the bismuth salt precipitate purity is greater than

This invention relates to the field of chemical pharmaceutical manufacturing technology, and discloses a process for preparing compound sodium bicarbonate to improve acid-base balance. The process includes: preparing an alkaline sodium bicarbonate raw material solution and an acidic raw material solution containing calcium and magnesium salts; dispersing the alkaline raw material solution into droplet clusters using a coaxial gas-liquid atomizing nozzle and a carbon dioxide gas source; allowing the droplet clusters to absorb carbon dioxide and pre-regulate their own hydrogen ion concentration during vertical vector descent; introducing the droplet clusters into the acidic raw material solution to form a homogeneous system and dispensing them; sterilizing the pharmaceutical packaging containers using a terminal overpressure compensation method; and injecting carbon dioxide into the sterilization chamber during the heating stage to establish an external pressure barrier. This invention solves the contradiction of high-concentration calcium and magnesium ions and bicarbonate ions precipitation in a single homogeneous system by blocking the precipitation formation pathway through microscale acidification modification, achieving long-term physical stability and coexistence of the formulation.

The invention relates to the technical field of livestock breeding monitoring, and particularly discloses a sheep rumen health environment monitoring device and system. The device comprises a swallowable monitoring capsule, a multi-parameter sensing module integrated with biochemical, electrochemical biological and physical quantity sensing units is arranged in the monitoring capsule, and the monitoring capsule is used for synchronously collecting hydrogen ion concentration, volatile fatty acid concentration, ammonia nitrogen concentration, microbial metabolism electric signals, temperature and pressure data of rumen fluid in situ and transmitting the data through a wireless communication module. The system further comprises a data gateway and a remote server platform. A health analysis model operated by a server platform can carry out deep processing on the multi-source time sequence data, and early judgment of the sub-clinical rumen acidosis risk and quantitative evaluation of the feeding efficiency are achieved by executing a specific multi-condition linkage early warning algorithm and a metabolic balance evaluation algorithm. According to the invention, the defects of one-sided monitoring parameters and insufficient data utilization in the prior art are overcome, and a more comprehensive and intelligent rumen health management solution is provided.

The present method entails separating thorium by anion exchange to obtain a solution of a mixture of radium and actinium radionuclides, desorbing the thorium from the anion-exchange resin, separating the actinium and radium by cation exchange, and purifying the actinium of iron salt impurities and organic impurities. The thorium is desorbed using a solution containing a mixture of ammonium acetate and acetic acid. The actinium is purified of iron salts and organic impurities in a column containing two sorbents: a bottom layer comprised of a hydrophilic macroporous resin based on a polymethyl methacrylic acid ether; and a top layer comprised of a sorbent based on di(2-ethylhexyl)phosphoric acid applied to an inert carrier. The total concentration of ammonium acetate and acetic acid used in the desorption of thorium lies in a range of from 0.5 to 4.0 mol / L, and the concentration of hydrogen ions lies in a pH range of from 3.5 to 5.0. For added purification, the column is washed with a solution of hydrochloric acid having a concentration in a range of from 0.015 to 0.025 mol / L. The actinium is eluted using a solution of hydrochloric acid. The method makes it possible to isolate radionuclidically and chemically pure actinium-225 from a mixture containing radium-224, radium-225, thorium-228 and thorium-229 radionuclides.

Provided is a method for producing a lithium-containing solution that allows suppressing production cost for lithium production by increasing a lithium content rate in a solution after an eluting step, and suppressing amount of a solution used in a process after the eluting step. The method for producing a lithium-containing solution includes an adsorption step, an eluting step of bringing post-adsorption lithium manganese oxide into contact with an acid-containing solution to obtain an eluted solution, and a manganese oxidation step performed in this order. The eluted solution is separated into a high concentration lithium-eluted solution and a low concentration lithium-eluted solution. The acid-containing solution includes a solution prepared by adding acid to the low concentration lithium-eluted solution. With this aspect, since only the low concentration lithium-eluted solution is added to the acid-containing solution, a hydrogen ion concentration in the acid-containing solution can be increased by adding just a small amount of acid, which consequently allows suppressing amount of the acid-containing solution and allows suppressing amount of the eluted solution used in the manganese oxidation step.

The invention discloses a method for preparing high-purity calcium nitrate tetrahydrate by using fluorine-containing waste nitric acid, which comprises the following steps: S1, filtering the fluorine-containing waste nitric acid to remove impurities, and adding the fluorine-containing waste nitric acid into process water to enable the hydrogen ion concentration of the mixed solution to be 3-5mol / L; s2, removing impurities; s3, transferring the solution subjected to impurity removal into a reactor, adding lime milk, keeping the pH value at 6-9, continuously stirring, and then feeding into a filter pressing system to obtain a calcium nitrate tetrahydrate solution and calcium fluoride; s4, the calcium fluoride is rinsed and dried; s5, adding nitric acid into the calcium nitrate tetrahydrate solution to adjust the pH value, and sending the solution into an evaporation kettle for concentration; s6, after the density of the concentrated calcium nitrate tetrahydrate solution is greater than or equal to 1.65 g / mL, feeding the concentrated calcium nitrate tetrahydrate solution into a crystallization kettle to obtain calcium nitrate tetrahydrate crystals; s7, performing centrifugation; and S8, carrying out secondary crystallization. The lime milk is added into the fluorine-containing nitric acid to participate in the reaction, the nitrogen element and the fluorine element in the fluorine-containing nitric acid are recycled, the high-purity calcium nitrate tetrahydrate and calcium fluoride products are prepared, the process is simple, and the treatment cost is low.

A dynamic optimization method for acid-to-ore ratio in high-pressure leaching of laterite nickel ore includes: obtaining a feed ore composition, a pulp concentration, a pulp flow rate, a leaching temperature and a pulp duration time in an autoclave, and setting a target leaching rate of nickel; setting a flow rate of sulfuric acid; obtaining a relationship between a hydrogen ion concentration in a solution and a reaction time; obtaining a theoretical leaching rate of nickel when a leaching time reaches the pulp duration time in the autoclave; comparing the theoretical leaching rate of nickel with the target leaching rate of nickel; adjusting the set flow rate of the sulfuric acid until the theoretical leaching rate of nickel is equal to the target leaching rate of nickel, calculating a corresponding optimal acid-to-ore ratio; and adjusting an opening degree of a sulfuric acid flow regulating valve of the autoclave.

The invention belongs to the technical field of high-temperature well fracturing materials, and relates to a slow-release acid for fracturing by utilizing phase state slow release and a preparation method thereof. The preparation method comprises the following steps: preparing urea phosphate crystals; in the preparation process of the water-based gel, urea is added and uniformly stirred, and the urea water-based fracturing fluid is prepared; and mixing the urea phosphate crystal and the urea water-based fracturing fluid to obtain the slow-release acid for fracturing. In the dissolving process, dissociation balance of urea phosphate crystals moves reversely due to the existence of excessive urea, the solubility of urea phosphate is reduced, the concentration of phosphoric acid dissociated from the solution is reduced, and the corrosion inhibition effect is achieved. In a high-temperature stratum, urea is subjected to a polymerization reaction, the concentration of urea in a solution is reduced, dissociation balance moves forwards, the solubility of a urea phosphate solid is increased, and the concentration of phosphoric acid dissociated from the solution is increased; and the ionization balance of phosphoric acid is promoted to proceed forward by the temperature rise, and the hydrogen ion concentration in the solution is increased, so that the acidity of the fracturing fluid is accurately controlled.