311 results about "Free acid" patented technology

Provided herein is a process comprising heating a composition comprising (P)-compound A or a salt thereof and a solvent to a temperature of 250° C. to 350° C. to form racemized compound A. Also provided is a process for isolating (P)-compound A from a composition comprising (P)-compound A and a tartrate, as described herein. Further provided herein, is a process for isolating a free acid of a tartrate or a hydrate thereof from a composition comprising a tartrate, (P)-compound A, and an organic solvent.

The invention discloses a plant extract-based bisphenol-free acidic color fixing agent and a preparation method thereof, the color fixing agent adopts natural plant polyphenol as a raw material, the use of bisphenol compounds as a raw material is avoided, and bisphenol substances may induce an oxidative stress system of a human body, disturb an endocrine system and an immune system or cause in-vivo balance disorder, so that the color fixing agent has a good color fixing effect. Even the risk of increasing diabetes and heart disease is caused, and even certain reproductive toxicity is caused. The plant polyphenol compound used for preparing the color fixing agent is non-toxic and harmless, and no toxic substance is left in the color fixing agent finished product. The water-soaking-resistant color fastness and the soaping-resistant color fastness of the bisphenol-free acidic color fixing agent can be both improved to level 3 or above.

Compositions for delivering ketone bodies to a subject include one or more beta-hydroxybutyrate salts, one or more acetoacetate salts, beta-hydroxybutyric acid, and optionally acetoacetic acid. The compositions may optionally include one or more ketone body esters, such as one or more beta-hydroxybutyrate esters and / or one or more acetoacetate esters. An example composition contains about 2% to about 98% on a molar basis of the one or more beta-hydroxybutyrate salts and the one or more acetoacetate salts, about 2% to about 98% on a molar basis of the beta-hydroxybutyrate free acid and optionally the acetoacetate free acid, and optionally about 2% to about 98% on a molar basis of one or more ketone body esters.

The invention relates to the field of electroplating, and discloses a tin-silver alloy electroplating solution as well as a preparation method and application thereof and an electroplating method, and the electroplating solution comprises soluble stannous salt, soluble silver salt, a composite surfactant, free acid, an antioxidant, a complexing agent and a solvent. When the electroplating liquid is used for electroplating, the available current density can reach 25 ASD, the electroplating efficiency is high, tin-silver alloy salient points obtained through electroplating are uniform, the cavity proportion is small after the salient points flow back, and collapse is avoided.

The invention discloses a method for purifying high-purity quartz sand, which belongs to the technical field of preparation of high-purity quartz sand, and comprises the following steps: (1) sequentially carrying out high-pressure water jet scrubbing, gradient screening classification and dielectric separation on sandstone type quartz ore raw ore with SiO2 content of 85-90% to remove feldspar to obtain quartz particles with feldspar content of less than or equal to 2%; (2) sequentially carrying out microwave field pretreatment, infrared light field crack propagation and pulse laser implosion stripping on the quartz particles obtained in the step (1), and regulating and controlling technological parameters of the three fields through linkage of a PLC (Programmable Logic Controller) system, so that the stripping rate of an impurity inclusion is greater than or equal to 92%; according to the invention, aiming at quartz particles with different particle sizes, a plurality of process parameters are automatically optimized and adjusted through the PLC system, accurate control and adaptive production are realized, and high-purity products can be stably produced from sandstone type quartz raw materials with different grades in different regions. And the inclusion is opened from inside to outside through a multi-field synergistic effect, and the completeness of the quartz particles is retained to the greatest extent by combining with an optimized fluoride-free acid leaching condition.

Processing aids and lubricants with free acid groups and relatively high molecular weights are used as process aids in the formation of extrudates and other molded materials. The compositions of this invention can be used as defined, or can be used with prior art processing aids, depending on the end use application. The novel materials and process provide a useful alternative to the sole use of fluorine-based polymer processing aids.

The invention discloses a method for preparing iron oxide and calcium chloride by electrochemically recovering iron-containing waste hydrochloric acid, and belongs to the technical field of waste acid treatment. The method comprises the following steps: S1, respectively putting a cathode and an anode at two ends of an electrolytic cell, putting a diaphragm to separate the cathode and the anode, filtering the iron-containing waste hydrochloric acid, removing suspended matters and solid residues, and introducing the iron-containing waste hydrochloric acid into the electrolytic cell; s2, measuring the content of iron element and the content of free acid in the iron-containing waste hydrochloric acid, and adding a neutralizing agent to neutralize redundant free acid; s3, applying voltage between the cathode and the anode according to the content of the iron element, performing electrolytic reaction to generate an oxidation intermediate, and oxidizing the iron element by using the oxidation intermediate to obtain a precipitate iron oxide and a calcium chloride solution; and S4, adding a proper amount of water into the reaction solution for dilution, filtering to obtain iron oxide, and concentrating the filtrate to obtain calcium chloride. According to the method, the oxidation intermediate generated by waste hydrochloric acid electrolysis is used as the oxidizing agent, the ferrous ions in the waste hydrochloric acid are selectively oxidized, other oxidizing agents do not need to be additionally added, new impurities cannot be generated in the oxidation process, the treatment time is short, the product is controllable, and remarkable economic benefits and social benefits are achieved.

The present invention provides a preparation method of lithium difluorooxalate borate, belonging to the technical field of lithium battery electrolyte additives. The present invention obtains a bis(methylsilyl) oxalate compound by a substitution reaction between a methylchlorosilane compound and oxalic acid, and mixes the bis(methylsilyl) oxalate compound with lithium oxalate, a boron trifluoride complex and an organic solvent to obtain lithium difluorooxalate borate; wherein the bis(methylsilyl) oxalate compound is used as a raw material, has strong reaction activity, generates a stable methylfluorosilane gas byproduct while introducing oxalate into the system, and does not cause chloride ions and free acid residues; in addition, when the raw material is bis(trimethylsilyl) oxalate, even if there is a small amount of raw material residue, it can be used as a new multifunctional electrolyte additive, play a certain synergistic role, and can improve the compatibility between electrolytes. The whole process is simple, the product yield obtained by the reaction is high, the product purity is high, and the separation is easy, which is suitable for industrial production.

The invention relates to the field of electroplating, and discloses a tin-silver alloy electroplating solution and a preparation method and application thereof.The electroplating solution comprises soluble stannous salt, soluble silver salt, a composite defoaming agent, an anti-scorching agent, free acid, an antioxidant, a complexing agent and a solvent, and the composite defoaming agent comprises a first defoaming agent and a second defoaming agent; the first defoaming agent is selected from naphthol sulfonic acid, and the second defoaming agent is selected from naphthol ether; the molar ratio of the first defoaming agent to the second defoaming agent is 1: (1-4). The tin-silver alloy electroplating solution provided by the invention contains the composite defoaming agent compounded by the naphthol sulfonic acid and the naphthol ether, so that foam can be effectively prevented from being formed, and meanwhile, the formed foam is destroyed, so that a tin-silver alloy bump is prevented from generating a cavity after backflow. In addition, the composite defoaming agent has good water solubility and high cloud point, does not cause turbidity of the electroplating liquid at a relatively high temperature, and can avoid influence on normal use of the electroplating liquid.

The invention relates to the technical field of flash fire lifting agents, and discloses a flash fire lifting agent of an electrolyte of a boron-free aluminum electrolytic capacitor and a preparation method of the flash fire lifting agent, and the flash fire lifting agent comprises the following components in percentage by mass: 10-30% of organic ammonium carboxylate; 5%-15% of a nitro compound; 3%-10% of a phosphate ester compound; 2%-8% of a polyethylene glycol derivative; 0.5%-3% of organic siloxane; and the balance of deionized water. Through the synergistic effect of the organic ammonium carboxylate, the nitro compound, the phosphate ester substance and the organosiloxane in a specific proportion, the sparking voltage of the electrolyte is remarkably improved, and the negative effects of boron elements on the environment and the performance of a capacitor are avoided; a nitro compound is used as an electron acceptor to inhibit hydrogen precipitation, and cooperates with phosphate to fill oxide film micropores and block current concentration; the organic siloxane forms a hydrophobic barrier on an electrode interface, electrolyte decomposition is delayed, the organic carboxylic acid ammonium salt accurately controls the free acid concentration, and the conductivity rise caused by hydrogen ion migration is avoided.

The invention discloses a preparation method of 2-hydroxy-4-(methylthio) butyric acid, and belongs to the technical field of chemical engineering, 2-hydroxy-4-(methylthio) butyronitrile and acidic resin are subjected to a hydration reaction and a hydrolysis reaction, then extractive distillation treatment is performed to recover an extraction agent, and the product 2-hydroxy-4-(methylthio) butyric acid is obtained; according to the invention, the acidic resin is used for replacing free acid, so that the corrosion to equipment is reduced, the possibility of side reaction between concentrated acid and 2-hydroxy-4-methylthio butyronitrile is avoided, the content of impurity polymers is obviously reduced, and the yield of a main product reaches 99.8% or above; the generated resin ammonium salt is about 50% less than the inorganic ammonium salt generated by using free acid, so that the post-treatment cost is reduced; through the process method provided by the invention, the prepared 2-hydroxy-4-methylthiobutyric acid is high in purity, the content of impurities such as residual solvent and resin ammonium salt in the product is low, and efficient separation and purification are realized.

The invention relates to the technical field of water-soluble fertilizers, in particular to a high-magnesium medium-trace particle water-soluble fertilizer and a preparation method thereof. The invention discloses a high-magnesium medium-trace particle water-soluble fertilizer, which is prepared by carrying out spray granulation on granulation slurry in a granulator through a nozzle, the specific gravity of the granulation slurry is greater than or equal to 1.68 g / cm < 3 >, and the mass content of magnesium in the granulation slurry is greater than or equal to 2.0%; in the high-magnesium medium-trace particle water-soluble fertilizer, the mass content of magnesium is greater than or equal to 1.0%. Through the steps of neutralization treatment and filtration impurity removal, free acid and impurities which influence the product quality are effectively removed; by accurately controlling concentration and cooling conditions, the content of free water in the product is reduced, and the physical property of the product is improved; through granulation, the final product has better appearance roundness and stability.

The invention relates to a monitoring method for a preparation process of bis (fluorosulfonyl) imide metal salt and a preparation method. The monitoring method is used for monitoring the preparation process of synthesizing the bis (fluorosulfonyl) imide metal salt through double decomposition reaction of bis (fluorosulfonyl) imide and metal salt, and comprises the following steps: taking a real-time reaction solution sample of the double decomposition reaction; testing the real-time total mass content W2 of the free acid in the reaction solution sample and the real-time mass content W3 of the free acid HR in the reaction solution sample; according to the initial mass content W1 of the free acid in the imidodisulfuryl fluoride raw material, the real-time total mass content W2 of the free acid in the reaction solution sample and the mass content W3 of the free acid HR in the reaction solution sample, the percentage content X of the mass of the residual imidodisulfuryl fluoride in the reaction solution to the mass of the imidodisulfuryl fluoride raw material is obtained; and judging the preparation process of the bis (fluorosulfonyl) imide metal salt according to the X value. According to the method, the preparation process of the bis (fluorosulfonyl) imide metal salt can be effectively monitored.

In order to overcome the defect of lack of a preparation method of sodium monofluorophosphate applied to a battery, the invention provides a preparation method of battery-grade sodium monofluorophosphate, which comprises the following steps: adding phosphorus pentoxide and sodium oxide into a reactor and uniformly mixing; mixing sodium hexafluorophosphate with a polar solvent to obtain a mixed solution; dropwise adding the mixed solution into a reactor, heating after dropwise adding to obtain a crude product, and purifying the crude product to obtain sodium monofluorophosphate. According to the sodium monofluorophosphate product prepared by the preparation method disclosed by the invention, the main content of sodium monofluorophosphate is greater than 98%, and chloride ions are lt; the turbidity is less than or equal to 1NTU, and the chromaticity is 1t; the sodium monofluorophosphate prepared by the method has the advantages that the content of the free acid is less than 50ppm, the water content is less than 200ppm, and the sodium monofluorophosphate can reach the standard of the sodium monofluorophosphate used in the battery industry.

The invention belongs to the field of batteries, and particularly relates to an electrolyte and a semi-solid battery. The electrolyte comprises a lithium salt, a solvent and an additive, the additive comprises a solvent additive; the solvent additive comprises a low HOMO energy level solvent; preferably, the solvent with the low HOMO energy level is 2, 2, 2-trifluoroethanol (TFEA), and the solvent with the low HOMO energy level is 2, 2, 2-trifluoroethanol (TFEA). According to the electrolyte disclosed by the invention, by adopting the solvent additive with low HOMO energy level, the stability of the battery under high voltage can be effectively improved, an electrolyte-electrode interface is protected, the dissolution of transition metal is inhibited, electrolyte side reaction caused by moisture, free acid and transition metal is reduced, and the performance of the battery in a high-temperature storage test is improved; meanwhile, the cycle life and the rate capability of the battery are improved.

The present invention discloses a method for synchronously recovering high-concentration free acid and heavy metals in stainless steel pickling wastewater. The present invention adopts a "diffusion dialysis + three-step precipitation" coupling method to synergistically recover free acid and heavy metals in stainless steel pickling wastewater. The method comprises the following steps: firstly, a diffusion dialysis method is used to separate and recover mixed free acids (such as nitric acid, hydrofluoric acid, sulfuric acid or hydrochloric acid, etc.) in stainless steel pickling wastewater, and then a three-step precipitation method is used to successively separate and recover heavy metals (such as iron, chromium, nickel, etc.) in the dialysis residue. Compared with conventional extraction, adsorption, evaporation, membrane technology and other treatment methods that recover acid or heavy metals alone, the "diffusion dialysis + three-step precipitation" coupling method adopted by the present invention can realize the synchronous recovery of high-concentration free acid and heavy metals in stainless steel pickling wastewater, and the process is simple, easy to operate, energy-saving and efficient, low cost, and has excellent prospects for industrial application.

The present invention provides a powdered vinegar that comprises partly neutralized vinegar, i.e. vinegar derived acid that is partly neutralized with e.g. sodium and / or potassium hydroxide, and free vinegar derived acid. The invention also provides a process for producing such a powdered vinegar and the use of this powdered vinegar in a foodstuff or a beverage, e.g. as a preservative. The present process offers the advantage that it yields a stable, free flowing powdered vinegar that can suitably be used as a preservative in e.g. processed meat products. The powdered vinegar has a high content of free acid, is easy to dissolve and acts as an acidulant.

The invention discloses a resourceful treatment method for stainless steel pickling waste liquid and waste water. The waste liquid is divided into high-concentration waste liquid and low-concentration waste liquid according to the acid concentration and the salt concentration to be treated respectively. Sequentially recovering gypsum, chromic hydroxide, nickel sulfide, ferrous hydroxide and manganese-rich slag from the low-concentration waste liquid through gradient precipitation; and neutralizing free acid from the high-concentration waste liquid by using ferrous hydroxide generated in a low-concentration section, cooling and crystallizing to recover ferrous sulfate, deeply removing nickel by using nickel sulfide generated in the low-concentration section, and precipitating to recover chromium hydroxide. In the whole process, generation of ferric iron is strictly controlled, and high-value productization recovery of free acid and all metals is achieved. The method has the advantages of low medicament consumption, high metal recovery rate, high product value, no secondary pollution and the like.

The present invention provides a method for preparing polyferric sulfate from solid waste yellow ferrous sulfate in a titanium dioxide factory, comprising the following steps: dissolving the yellow ferrous sulfate raw material in water, adding iron oxide red under heating conditions, stirring until the reaction is complete, and then filtering to remove insoluble impurities; adding an oxidant to the filtrate, heating and stirring to carry out oxidation, hydrolysis, and polymerization reactions to obtain a liquid product; concentrating and drying the liquid product to prepare solid polyferric sulfate. The method neutralizes the free acid in the raw material yellow ferrous sulfate by adding iron oxide red, increases the content of effective component iron in the system, and the prepared product has a relatively high basicity and good polymerization effect, and no external acid or alkali is required during the preparation process. The present invention eliminates the environmental protection hidden danger caused by the stacking of solid waste, enables the comprehensive utilization of industrial waste by-products, reduces the production cost of polyferric sulfate, and improves the economic benefit of titanium dioxide production.

The application discloses a method for rapidly and harmlessly treating phosphogypsum, and particularly relates to the harmless treatment technical field of industrial solid waste. The method comprises the following steps: mixing raw materials with an alkaline neutralizing agent, a trapping agent and an activating agent, adding a phosphorus solidifying agent and a fluorine solidifying agent, mixing, carbonizing and aging, and obtaining harmless phosphogypsum. The method adopts the alkaline neutralizing agent to rapidly neutralize free acid and improve the pH of the system; the trapping agent adsorbs heavy metals; the activating agent promotes As, Cd and the like to form a difficult-to-dissolve iron oxide gel or a precipitate; the phosphorus solidifying agent and the fluorine solidifying agent perform deep chemical precipitation to form a stable iron-calcium-phosphate / ferric fluoride composite solidified body. The functions of the agents are clear, and the agents have synergistic effects; the solidification effect of the agents on high water-solubility phosphorus, fluorine and various heavy metals is far better than that of a single or simply compounded agent system; and the leaching concentration can be reduced to a level far lower than the national standard.

The utility model discloses an ammonia desulfurization system which comprises a mixer, and the mixer is connected with a metering blanking pump, a metering ammonia adding pump and a centrifuge metering feeding pump through pipelines. According to the utility model, the mixer is arranged between the thickener and the centrifugal machine, and the mixer has two functions: firstly, the mixer is used as a buffer temporary storage container to receive the feed liquid from the outlet of the thickener, and secondly, the mixer is used as a mixed reaction device to provide a reaction space for the combination of ammonia water and the feed liquid. The device reduces the corrosion of the slurry to the ammonium sulfate equipment, has the advantages of simplicity and convenience in operation, safety, environment friendliness and good reliability, utilizes the existing device pipeline as much as possible, ensures that the free acid content in the ammonium sulfate product meets the standard requirement of the product at lower transformation cost, and has practical significance.

The invention belongs to the technical field of electrolyte materials, and discloses a high-purity lithium bis (fluorosulfonyl) imide solution as well as a preparation method and application thereof. The preparation method of the high-purity lithium bis (fluorosulfonyl) imide solution comprises the following steps: 1) mixing inert chloralkane and lithium carbonate to form a suspension, dropwise adding bis (fluorosulfonyl) imide into the suspension at reaction temperature and pressure for reaction, after the reaction is finished, performing filter pressing, washing, and performing filter pressing again to obtain a filter cake; and 2) crushing the filter cake, feeding the crushed filter cake into a closed-loop circulating fluidized bed, sequentially drying in a low-temperature area and a medium-temperature area, instantaneously contacting and dissolving the obtained hot powder with an atomized and sprayed carbonate solvent to form a solution, and performing microfiltration to obtain the high-purity lithium bis (fluorosulfonyl) imide solution. The lithium bis (fluorosulfonyl) imide solution has ultra-high purity and ultra-low moisture, the content of other impurities such as chloride ions, free acids and metal ions is extremely low, additional steps of dehydration, purification or acidity adjustment and the like are not needed, and the lithium bis (fluorosulfonyl) imide solution can be directly used for preparing a high-performance lithium ion battery electrolyte.

This utility model relates to the field of ammonium sulfate post-treatment technology in ammonia desulfurization, and discloses a free acid neutralization device for ammonium sulfate by-products of ammonia desulfurization. The device includes a hydrocyclone, centrifuge, neutralizing agent silo, metering feeder, feeding screw, dryer, dust removal equipment, and finished product storage silo. This free acid neutralization device for ammonium sulfate by-products of ammonia desulfurization, by setting up a neutralizing agent silo and a metering feeder, utilizes the post-treatment system equipment of the ammonia desulfurization unit to achieve compliant production of free acid from the by-product ammonium sulfate. It features a simple process, low equipment investment, negligible operating costs, low failure rate, and high safety and reliability.

The invention relates to the field of chemistry and chemical engineering, in particular to a method for preparing high-purity lactide through double-solvent phase change extraction. A compound containing oxygen-containing functional groups such as alcohol, ether, ketone, carboxylic acid and amide is selected as a hydrogen bond acceptor solvent, and water is selected as a hydrolysis solvent. Wherein the hydrogen bond acceptor solvent is combined with free acid impurities (hydrogen bond donors) in the crude lactide to form a deep eutectic solvent, and the water hydrolyzes meso-lactide into lactic acid retaining D, L-lactide. In the process, the whole system is subjected to heating, melting, blending, cooling, crystallizing and separating out, finally, solid-phase high-purity D, L lactide is subjected to separation and drying treatment, the chemical purity is improved to 99% or above from 40%-95%, and the optical purity is improved to 98% or above. According to the scheme, the operation is simple and convenient, the separation efficiency is high, the method is environment-friendly, the energy consumption is remarkably reduced, the defects of traditional high-temperature distillation and repeated recrystallization are avoided, and an efficient and environment-friendly new scheme is provided for industrial purification of lactide.

The present invention relates to the field of electroplating, and discloses a tin-silver alloy electroplating solution, a preparation method and application thereof, and an electroplating method. The electroplating solution contains a soluble stannous salt, a soluble silver salt, a composite surfactant, a free acid, an antioxidant, a complexing agent and a solvent. When electroplating with the electroplating solution, the available current density can reach 25 ASD, the electroplating efficiency is high, and the tin-silver alloy bumps obtained by electroplating are uniform, the proportion of voids after bump reflow is small, and no collapse occurs.

The invention provides a solution composition for testing the grafting rate of maleic anhydride, and belongs to the field of high polymer material detection. The solution composition for testing the maleic anhydride grafting rate is prepared from the following components in parts by weight: 80 to 90 parts of a main solvent, 5 to 10 parts of an auxiliary solvent, 3 to 5 parts of a surfactant, 2 to 5 parts of a solubilizer, 0.05 to 0.15 part of a disentangling agent and 0 to 0.15 part of water. The method comprehensively solves the four key problems of high-temperature volatilization / low-temperature precipitation, entanglement embedding, low titration efficiency and free anhydride interference in the traditional method which influence the test accuracy of the maleic anhydride grafting rate.

The invention discloses a preparation method and a recrystallization method of lithium bis (oxalato) borate. The invention provides a preparation method of lithium bis (oxalato) borate, which comprises the following steps: in a solvent, carrying out reaction on chain-like silicon oxalate as shown in a formula II and lithium bis (oxalato) borate to obtain lithium bis (oxalato) borate as shown in a formula III, the solvent is an aprotic organic solvent. The preparation method has one or more advantages as follows: the yield is high, the purity is high, insoluble substances are few, the chromaticity is low, free acid or chloride ions are lower, lithium bis (fluoro) oxalato borate can be recycled, and the cost is reduced.

The invention provides a poly-L-lactic acid polymer and a preparation method thereof, and the method comprises the following steps: replacing halogen atoms in a catalyst with an initiator containing a hydroxyl compound to generate an alkoxy compound Bi-OR, and then carrying out a polymerization reaction with L-lactide to obtain the high-molecular-weight poly-L-lactic acid polymer. The catalyst has high tolerance to water and free acid, the requirements for the free acid and the water content of the L-lactide are reduced, the L-lactide with high free acid and water content can be directly used, and the refining cost of the L-lactide is greatly reduced. The specific rotation of the poly-L-lactic acid polymer prepared by the method meets the standard, the poly-L-lactic acid polymer has high tolerance to moisture and free acid, the catalytic efficiency is high, the process stability is good, and the molecular weight can be regulated and controlled through the dosage of the initiator.

The invention provides a post-treatment method of an acid-containing DNBP crude product. The method comprises the following steps: deacidifying and dehydrating an acid-containing DNBP crude product to obtain a neutral DNBP crude product, mixing the neutral DNBP crude product with a crystallization solvent, and carrying out low-temperature recrystallization refining purification, so that a traditional DNBP crude product post-treatment refining process of washing with water and then distilling is abandoned, the refining process is green and environment-friendly, no wastewater is generated, the low-temperature recrystallization refining process does not need to heat a nitride DNBP, and the yield is high. The crystallization mother liquor obtained by recrystallization is rectified and separated to obtain a reaction solvent and a crystallization solvent for cyclic utilization, and meanwhile, after the crystallization solvent is added into the DNBP byproduct obtained after rectification, the DNBP byproduct can be further subjected to low-temperature crystallization purification. Tests show that the purity of the obtained pure DNBP product is more than or equal to 99%, the free acid content (in terms of H2SO4) is less than or equal to 0.01%, the benzene insoluble substance content is less than or equal to 0.1%, and each index meets the industrial requirements.

The invention provides a treatment method and device for neutralizing phosphogypsum free acid and a storage medium. The method comprises the steps that the initial free acid concentration of to-be-neutralized phosphogypsum and the release rate constant of the free acid are obtained; calculating first dynamic data according to the initial free acid concentration and the release rate constant of the free acid; obtaining an initial neutralizer release rate and a dissolution rate constant of the neutralizer; calculating to obtain second dynamic data according to the initial neutralizer release rate and dissolution rate constant; acquiring a temperature parameter and a humidity parameter; performing correction processing on the first dynamic data according to the temperature parameter to obtain third dynamic data; correcting the second dynamic data according to the humidity parameter to obtain fourth dynamic data; according to the third dynamic data and the fourth dynamic data, the free acid remaining amount of the phosphogypsum to be neutralized is determined, and the technical effect of improving the neutralization treatment efficiency and the neutralization stability of the phosphogypsum free acid is achieved.