191 results about "Dissolution reaction" patented technology

The invention discloses an electrolyte for an aqueous manganese-based battery. The electrolyte comprises an electrolyte, and the electrolyte comprises a manganese salt; the weak acid is used for regulating and controlling proton dynamic release of the positive electrode / electrolyte interface to realize on-demand supply of protons of the positive electrode / electrolyte interface; and a solvent, wherein the solvent is deionized water; the PH range of the electrolyte is 2.0-3.5, and the electrolyte can realize on-demand supply of protons of a positive electrode / electrolyte interface in the charging and discharging process of the aqueous manganese-based battery, and promotes efficient and reversible deposition and dissolution reaction of a positive active substance manganese dioxide. According to the invention, the proton on-demand supply electrolyte is constructed by utilizing dynamic dissociation equilibrium of weak acid, so that on-demand supply of protons in the MnO2 dissolving process is realized, complete electrochemical dissolution of MnO2 is promoted, and generation of'dead manganese 'is inhibited, so that the cycling stability of the battery and the utilization efficiency of active substances are remarkably improved. The invention also discloses an aqueous manganese-based battery for realizing on-demand supply of protons and application of the aqueous manganese-based battery in the field of secondary energy storage.

The invention discloses a phosphogypsum leachate-carbonate rock dynamic corrosion reaction analysis method based on numerical simulation, and aims to research a migration-corrosion coupling mechanism of acid leachate in a carbonate rock fracture network. The method comprises the following steps: firstly, acquiring a two-dimensional image sequence of a rock core sample through CT (Computed Tomography) scanning, carrying out operations such as threshold segmentation, membrane enhancement and a light shading algorithm on an image by utilizing AVIZO software, extracting fracture structure parameters and establishing a high-precision three-dimensional model; then, multiple groups of simplified models with different fracture widths are constructed in COMSOL Multiphysics, a Darcy flow field and a solute concentration field are coupled on the basis of the Darcy law and a dilute matter transfer theory, and the dynamic corrosion effect under the multi-field coupling effect is quantitatively represented by setting hydraulic gradient boundary conditions and chemical reaction kinetic parameters; the dynamic corrosion reaction process of calcium ions, hydrofluoric acid, sulfuric acid and phosphoric acid in the ardealite leachate and carbonate rocks with different crack widths is accurately simulated.

The invention relates to the technical field of machine vision, and particularly discloses a milk powder particle uniformity intelligent detection method and device based on machine vision, and the method comprises the steps: collecting a multi-modal image of a to-be-detected milk powder sample, extracting basic characteristic data of the to-be-detected milk powder sample, carrying out particle segmentation and adhesion analysis, and obtaining an adhesion signal of the to-be-detected milk powder sample; the method comprises the following steps: constructing a milk powder particle uniformity analysis model, determining an initial grade of milk powder particle uniformity, obtaining production parameters of a to-be-detected milk powder sample, outputting an updated grade of milk powder particle uniformity, carrying out dissolution reaction detection and thermal reaction detection on the to-be-detected milk powder sample, and outputting a milk powder particle reaction uniformity grade in combination with a BP neural network model. And obtaining a multi-dimensional uniformity evaluation report, and determining a milk powder particle regulation and control instruction. The problems that traditional detection depends on manual operation, efficiency is low, subjectivity is high, errors are large, and the requirements of modern production lines for high precision and high efficiency of milk powder quality control are difficult to meet are solved.

The utility model discloses a slaked lime powder on-line feeding and efficient magnesium removal and desulfurization reaction device which comprises a dissolution reaction tank, a slaked lime feeding assembly, a reaction flocculation tank, an overflow pipe, a liquid level meter and a frequency conversion material transfer pump. A water inlet pipe and a powder feeding opening are formed in the top of the dissolving reaction tank; the slaked lime adding assembly is used for adding slaked lime powder into the dissolving reaction tank; the reaction flocculation tank is communicated with the dissolution reaction tank through an overflow port, a feed liquid discharge port is formed in the bottom, and a flocculant filling port and a coagulant aid filling port are formed in the top; the bottom of the overflow pipe extends below the liquid level of the dissolving reaction tank, the top of the overflow pipe is communicated with the overflow port, and the liquidometer is used for monitoring the liquid level value of the reaction flocculation tank in real time; and the variable-frequency transfer pump is used for performing variable-frequency adjustment according to the liquid level value monitored by the liquid level meter. According to the utility model, the problem that only low-concentration magnesium ions, sulfate ions and desulfurization wastewater of suspended matters can be treated by the existing triple box treatment process is solved, and the automation degree is improved.

The invention discloses an efficient preparation process of cryolite, and relates to the field of cryolite preparation. The process comprises the following steps: S1, taking carbon residues ground by a ball mill, and putting the carbon residues into a dissolution reaction kettle filled with alkali liquor for reaction; s2, after the reaction in the reaction kettle is finished, filter pressing is performed through a plate-and-frame filter press, and coarse carbon powder and filtrate are obtained; s3, pumping the filtrate into a carbon reaction kettle, and introducing carbon dioxide for reaction; s4, after the reaction in the carbon component reaction kettle is finished, carrying out filter pressing through a plate-and-frame filter press; and S5, drying the solid material obtained by filter pressing in a calcining furnace to obtain cryolite. In the process, the industrial waste carbon residue is used as a raw material, and participates in a series of reactions to prepare the cryolite after being subjected to ball-milling refining treatment, so that resource recycling of the waste is realized. The method not only effectively reduces the pollution of the carbon residue to the environment, reduces the accumulation amount of solid wastes, but also reduces the exploitation of natural cryolite minerals, and protects non-renewable resources.

The invention provides a method for preparing a nearly 3.5-valent vanadium electrolyte by reducing ammonium metavanadate with coke oven gas, which comprises the following steps: (1) reducing and calcining ammonium metavanadate in coke oven gas to obtain a reduced product; (2) carrying out replacement deamination on the reduced product in the step (1) to obtain a nearly 3.5-valent vanadium oxide, wherein the nearly 3.5-valent vanadium oxide contains V4O7; and (3) a mixed sulfuric acid solution and the approximately 3.5-valent vanadium oxide are subjected to a dissolution reaction, and the approximately 3.5-valent vanadium electrolyte is obtained. The process method disclosed by the invention is simple and easy to implement, the approximately 3.5 valence vanadyl sulfate electrolyte product with high vanadium concentration and low ammonia content can be obtained by taking the ammonium metavanadate and the coke oven gas as raw materials, and the application prospect is wide.

The invention belongs to the field of light modulators, and provides an electrochromic device based on reversible double electrodeposition and application of the electrochromic device. The electrochromic device sequentially comprises a first transparent substrate, a first conductive layer, an electrolyte layer, a second conductive layer and a second transparent substrate; the electrolyte layer comprises a solvent and an electrolyte additive, and the electrolyte additive comprises a manganese salt, a zinc salt and a redox medium. And the charge change in the manganese ion deposition / dissolution process is compensated through the reversible deposition / dissolution reaction of zinc ions in the electrolyte. In the coloring process, manganese ions are subjected to oxidation reaction on the surface of the first transparent conductive substrate to form manganese dioxide sediment; meanwhile, the zinc ions are subjected to reduction reaction on the surface of the second transparent conductive substrate to form metal zinc. And in the fading process, the sediment is dissolved, so that the device is recovered to the initial transparent state. In addition, dissolution of manganese dioxide and metal zinc can be accelerated by adding the oxidation-reduction medium, and the reaction kinetics of the device is improved.

The embodiment of the application provides a chemical equilibrium simulation method for soil salt ions, comprising: acquiring multiple ion data of parameters associated with a chemical equilibrium simulation process of salt ions and constructing a chemical reaction parameter database; and calculating ion activity and constructing a chemical solving model, wherein the chemical solving model comprises a precipitation-dissolution reaction simulation model and a complexation reaction-cation exchange simulation model, one chemical solving is completed by sequentially solving the precipitation-dissolution reaction simulation model and the complexation reaction-cation exchange simulation model; setting initial conditions and termination conditions of iterative operation of the chemical solving model, inputting parameter data into solving, taking a concentration difference of multiple ions after adjacent two chemical solvings as an external loop control standard epsilon, judging whether to enter next chemical solving iteration or outputting a simulation result to obtain a precipitated chemical component content, a complexed chemical component content and an exchanged chemical component content of the salt ions in the soil.

The utility model relates to a kind of anti-rotation device of dissolvable bridge plug, it is related to oilfield downhole tool technical field, upper cap lower part thread sealing connection central tube, central tube lower part thread connection leading shoe, central tube is successively covered with advancing sleeve, rubber cylinder, vertebral body and slip below upper cap, slip falls on leading shoe, vertebral body is connected with slip by dovetail groove guide rail, advancing sleeve, vertebral body and central tube are connected by spline.This utility model has the beneficial effect that when the liquid in wellbore is rich in crude oil and does not meet the condition of dissolution reaction, the bridge plug is drilled by drilling tool, since central tube and advancing sleeve, vertebral body are connected by spline;vertebral body is connected with slip by dovetail groove guide rail, central tube and leading shoe are connected by thread, before slip anchoring is not removed, parts will not rotate each other, drilling tool will effectively drill each part of bridge plug, improve drilling efficiency;Drilling is complete, residual volume is small, can fall into well bottom and dissolve.

The invention provides a recovery treatment method of fluoride slag in uranium hexafluoride preparation, belongs to the technical field of nuclear industry waste slag treatment, and solves the technical problems that a product obtained by an existing fluoride slag treatment method is high in metal impurity content and low in uranium recovery rate, secondary fluoride slag is easily generated, and the product cannot be returned to a uranium purification and conversion production line for reuse. The method comprises the following steps: at the temperature of 400-600 DEG C, contacting the fluorinated slag with excessive water vapor to carry out high-temperature hydrolysis reaction, so that UF4 and uranium intermediate fluoride in the fluorinated slag generate uranium oxides U3O8 and UO3 with the fluorine ion content of less than 1mg / g, and filtering to obtain uranium oxides; mixing uranium oxide with a nitric acid solution, dissolving and reacting to obtain a uranyl nitrate solution; the pH of the uranyl nitrate solution is adjusted to 3-4, hydrogen peroxide is added for a precipitation reaction, solid-liquid separation is conducted, and uranium peroxide solid precipitates are obtained. The method is high in uranium recovery rate, low in product impurity content and capable of returning to a uranium purification and conversion production line for reuse.

This invention belongs to the field of hydraulic structure analysis technology, specifically disclosing a gravity dam coupling analysis method, system, electronic equipment, and storage medium, including: models describing water flow in concrete, the relationship between water pressure and stress, the dissolution reaction process, and the coupling of ion diffusion with water flow. By acquiring influencing variables, parameters of each model are correlated, and a solubility function considering performance parameters is established and dynamically updated. The solubility function is iteratively trained using experimental data to construct a finite element model, and simulations are performed based on the trained function. Early warnings are generated based on the simulation results to predict the concrete deterioration process and optimize maintenance decisions. It has the following advantages: by coupling multiple models such as water flow, chemical dissolution, and hydraulic fracturing, the long-term deterioration process of concrete under the action of water flow and dissolution is accurately simulated. The introduction of a solubility function and dynamic updating of material parameters, considering time-varying deterioration effects, comprehensively improves the accuracy of deterioration prediction and simulation results.

The invention discloses a lithium iron phosphate positive electrode material recovery method, which comprises: (1) adding dilute phosphoric acid to positive electrode material powder to prepare a lithium iron phosphate slurry, and carrying out electrolysis extraction to recover the lithium element in the positive electrode material powder so as to obtain an iron phosphate slurry; and (2) adding concentrated sulfuric acid into the iron phosphate slurry obtained in the step (1) to carry out a dissolution reaction, then carrying out solid-liquid separation to obtain a ferric sulfate solution containing phosphoric acid, then adding iron blocks or iron powder to carry out a reaction, and then adjusting the iron-phosphorus ratio and the ferrous ion content of the system to obtain a ferrous solution meeting the requirements of ammonium-process iron phosphate. The recycling method of the lithium iron phosphate positive electrode material is simple in technological process, less in acid and alkali consumption, less in waste liquid and low in cost, valuable elements such as lithium, iron and phosphorus in the lithium iron phosphate positive electrode powder are recycled at low cost and high yield, and the extracted iron and phosphorus elements are presented in a ferrous solution and can be directly grafted with an existing ammonium-process iron phosphate device, so that the recycling method is suitable for industrial production. Good popularization prospects are realized.

The utility model discloses a dissolution reaction kettle for producing a ritonavir intermediate MTV-III, which is characterized in that a kettle cover is arranged on the upper surface of a kettle body, the lower part of a main shaft of a stirrer and a stirring paddle are movably arranged in the kettle body, a mixed liquid feeding hole and a water inlet are formed in the upper surface of the kettle cover, and an outer ring groove and an inner ring groove are formed in the lower surface of the kettle cover; an outer ring cover plate is arranged on the lower surface of the kettle cover and located at the outer ring groove, an inner ring cover plate is arranged on the lower surface of the kettle cover and located at the inner ring groove, the outer ring cover plate is provided with a plurality of discharging ports, and the inner ring cover plate is provided with a plurality of nozzles. On one hand, a mixed solution is evenly discharged through the outer ring groove, water is evenly discharged through the inner ring groove, and compared with installation of a water distributor, space is saved; and on the other hand, water is sprayed out through the nozzles, the outlet pressure is higher, the water can be quickly mixed and contacted with the mixed solution, and the dissolving effect is better.

The invention discloses an ion channel protein near-atomic scale confinement dissolution electrochemical machining method based on a bionic confinement interface. The method is characterized in that a bionic phospholipid bilayer mask is spread on a workpiece anode to shield a non-processing area, ion channel protein is embedded into the bionic phospholipid bilayer mask to serve as an electrolyte channel, and when the bionic phospholipid bilayer mask is powered on, the anode dissolution reaction is strictly limited in the ion channel protein channel. Millivolt-level picosecond-nanosecond pulse voltage or current is adopted on the time scale so that anode metal atoms can be removed one by one, electrolytic products are discharged in the modes of electrolyte adjustment, microcosmic acting force, micro vibration and the like so as to ensure sustainable generation of electrochemical reaction, and therefore near-atomic-scale electrolytic machining is achieved. The electrochemical machining technology and the biological field are fused in an interdisciplinary mode, the near-atomic-scale electrochemical dissolution reaction space is constructed, the capacity of electrochemical machining for removing materials in an ion form is approached, and near-atomic-scale electrochemical machining is achieved.

The application provides a method for preparing 3.5-valence vanadyl sulfate electrolyte by reducing ammonium polyvanadate with a gas, which comprises the following steps: (1) ammonium polyvanadate is reduced and calcined by a reducing gas to obtain vanadium oxide; the vanadium oxide contains V4O7; the reducing gas comprises a mixed gas of NH3, CO and H2; (2) a mixed sulfuric acid solution and the vanadium oxide are subjected to a dissolution reaction, and vanadium adjustment is performed to obtain 3.5-valence vanadyl sulfate electrolyte. The process is simple and easy to implement, 3.5-valence vanadyl sulfate electrolyte product can be obtained from ammonium polyvanadate as raw material, the vanadium concentration is high, and the application prospect is wide.

The invention discloses an all-iron flow battery negative electrode electrolyte as well as a preparation method and application thereof, the negative electrode electrolyte is prepared from the following components: 1.8 to 3.6 mol / L of ferrous chloride, 0.25 to 1.5 mol / L of magnesium chloride, 0.05 to 0.15 mol / L of sodium chloride and the balance of water, and the pH (Potential of Hydrogen) is-1.0 to 0. According to the negative electrode electrolyte of the efficient all-iron flow battery, the extremely low pH of-1.0-0 is adopted, the problems of hydrogen evolution and poor reversibility of a deposition / dissolution reaction existing in a negative electrode of the all-iron flow battery are solved by regulating and controlling magnesium chloride on an inorganic interface in a strong acid environment, and the all-iron flow battery with high coulombic efficiency and long cycle life is obtained.

The application relates to a preparation process of synthesizing hybrid zinc aluminate by using solid waste sodium tetrachloroaluminate, and belongs to the technical field of chemical dangerous waste treatment, and comprises the following synthesis steps: S1, zinc compounds are added in water, and the zinc compounds are completely dissolved or uniformly dispersed; S2, solid waste sodium tetrachloroaluminate is added, and the solid waste sodium tetrachloroaluminate is completely dissolved and reacted by continuing to stir; S3, an oxidizing agent is added, and the reaction is continued by keeping warm and stirring, then filtration is carried out, and the phosphorus content in the filtrate is detected; S4, after the phosphorus content is qualified, sodium hydroxide solution is added into the filtrate, the pH value is controlled, and white zinc aluminate precursor precipitate is generated; S5, the white zinc aluminate precursor precipitate is transferred into a high-pressure reaction kettle to carry out hydrothermal reaction, and hybrid zinc aluminate liquid is generated; S6, negative pressure suction filtration is carried out, the obtained filter solid is washed by using deionized water, the filter solid is subjected to spray drying, and solid hybrid zinc aluminate is obtained. The application fully utilizes aluminum resources in the solid waste sodium tetrachloroaluminate, and total phosphorus impurities in the solid waste sodium tetrachloroaluminate are also utilized to generate effective components, so that waste is turned into treasure.

The application provides a metal material soil corrosion rate prediction method and model, and belongs to the technical field of metal life evaluation and environmental geotechnical disaster prevention and reduction; a mathematical model determined based on the basic reaction process of an electrode system response is used for predicting the corrosion rate of a metal in a soil environment; a dissolution reaction current I 1 , a passivation reaction current I 2 , and a corrosion product layer coverage θ are calculated to represent the strength of metal corrosion; the method explicitly includes the key characteristics of the surface electrochemical reaction of the metal under the action of different soil environments, and makes up for the deficiency of existing data analysis; the application can more reliably predict the charge transfer mechanism between the metal surface and the surrounding soil, and solves the uncertainty of traditional analysis methods in interpreting impedance data.

The invention discloses a method and device for preparing a silver compound from metallic silver. The method mainly comprises the following steps that (1) at least one electrolytic bath is adopted, the metallic silver is taken as an anode, an insoluble conductor is taken as a cathode, the anode is connected with an anode of an electrolytic power source, and the cathode is connected with a cathode of the electrolytic power source; (2) putting an alkaline electrolyte into an electrolytic bath as an electrolyte in contact with the anode; and (3) starting an electrolysis power supply to carry out electrolysis operation, carrying out metal silver dissolution reaction on the anode, and reacting silver ions generated by dissolution in the alkaline electrolyte to generate a solid silver compound and / or a soluble silver complex. According to the invention, the three problems of safety, pollution and cost in the existing production technology for preparing the silver compound are solved.

The utility model discloses a 1, 2-benzisothiazolin-3-ketone alkali dissolution reaction system which comprises a working table, one side of the working table is fixedly connected with a left supporting plate, the other side of the working table is fixedly connected with a right supporting plate, one side of the upper surface of the working table is fixedly connected with a bearing, the upper end of the bearing is rotatably connected with a reaction kettle, and the upper end of the reaction kettle is rotatably connected with a motor. A connecting rod is fixedly connected to the interior of the reaction kettle, a plurality of first stirring rods are fixedly connected to the surface of the connecting rod, a power structure is fixedly connected to the upper surface of the right supporting plate, and a heating base is fixedly connected to the other side of the upper surface of the workbench. The reaction kettle and the power structure are arranged, so that the device can fully mix reaction solutions under the condition that the reaction environment is sealed, the condition that the reaction is not thorough due to the fact that one side with large density sinks is avoided, and the device can process ingredients during reaction in the reaction kettle by arranging the heating seat.

The present invention relates to a method for simulating soil water and salt, including: collecting soil data, meteorological data, irrigation data, and groundwater data for driving the model; determining soil hydraulic parameters, evaporation stress parameters, solute transport parameters, ion adsorption parameters, precipitation / dissolution parameters, and simulation time; constructing a water and salt transport model considering multi-component salt competitive adsorption and precipitation / dissolution reactions; setting the initial conditions and upper and lower boundary conditions for model operation, inputting soil information, meteorological data, groundwater data, and required parameters, and solving the above-constructed model using numerical algorithms to obtain the water and salt distribution characteristics on the soil profile at a specified time. Based on the traditional water and salt transport model, the present invention considers the physical and chemical reaction processes of multi-component salts and the influence of salt crystallization on soil evaporation during the water and salt transport process, and can reflect the water movement and salt reaction and transport processes in the soil, making it more suitable for simulating the water and salt transport process in saline soil.

The utility model discloses a dissolution reaction kettle for preparing tebuconazole. The dissolution reaction kettle comprises a reaction kettle main body and a kettle cover, wherein the reaction kettle main body is used for carrying out dissolution reaction on tebuconazole preparation raw materials; the kettle cover is movably mounted at the top of the reaction kettle main body through mounting bolts; a motor is fixedly mounted in the center of the top of the kettle cover through a mounting frame; the output end of the motor rotationally penetrates through the inner side of the mounting frame and is fixedly connected with a transmission shaft. According to the reaction kettle, raw materials can be conveniently subjected to rotary stirring, vibration stirring and spiral stirring from bottom to top, so that the raw materials between different parts can be fully stirred, dissolved and reacted; the raw materials can be smashed and scattered, the reaction rate of raw material dissolution can be further increased, the problems that an existing reaction kettle is prone to uneven stirring, and the raw materials are clustered and cannot be fully dissolved and smashed easily are solved, so that the dissolution reaction efficiency is further improved, the product quality is greatly guaranteed, and the reaction kettle is suitable for being popularized and used.

The present application discloses a method for measuring the dissolution rate of sediment by a cleaning agent. Specifically, a sediment sample of a first preset mass and a cleaning agent solution of a first preset volume are mixed, so that the sediment and the cleaning agent solution undergo a dissolution reaction under preset cleaning conditions to obtain a dissolved mixture; supernatants of different reaction times are extracted from the dissolved mixture; the maximum concentration value of each target element in each supernatant and the target extraction time corresponding to the maximum concentration value are determined; the dissolution rate of the sediment by the cleaning agent solution is calculated based on the first preset volume, the maximum concentration value corresponding to each target element, the target extraction time corresponding to each target element, and the mass relationship coefficient between each target element and the phase composition. By measuring the peak concentration of the target element and the time point when the peak is reached, the dissolution rate of the cleaning agent solution is calculated, which helps to select the most effective cleaning agent to meet actual needs.

The invention relates to the technical field of solar cells, in particular to a high-purity lead iodide synthesis method which comprises the following steps: S1, preparing a lead salt solution; s2, filtering to obtain a primary lead salt solution; s3, diluting the primary lead salt solution to 0.015-0.15 mol / L, carrying out activated carbon adsorption and ion exchange resin purification, carrying out reduced pressure evaporation, and washing to obtain a high-purity lead salt crystal; s4, dropwise adding the high-purity lead salt solution into the iodized salt solution for precipitation reaction, and filtering after aging; and S5, dispersing the precipitate in a first solvent, washing, and filtering to obtain the high-purity lead iodide. The invention relates to a high-purity lead iodide synthesis method, which comprises the following steps: applying a low-cost auxiliary solvent to a lead dissolution reaction, carrying out precipitation reaction on a lead salt solution, carrying out preliminary impurity removal treatment, carrying out resin adsorption and other combined processes, reducing the content of impurity elements in high-quality metal lead, and preparing high-purity lead iodide; the combined process is easy and convenient to operate, the used reagents are wide in source and low in cost, the final product is high in purity, operation conditions are mild, and the combined process is suitable for the requirement of large-scale process production.

This invention belongs to the field of electrocatalysis technology and discloses a method for preparing porous gallium oxide based on pulsed electrochemical corrosion. Using phosphoric acid solution as the electrolyte, and employing pulsed electrochemical corrosion at a pulse potential of 6-14 V for 20-90 min with a duty cycle of 30%-70%, porous gallium oxide was successfully prepared. This invention utilizes pulsed electrochemical corrosion under low-temperature conditions. During the pulse-on phase, it enhances the oxidation-dissolution reaction at the anodic interface and promotes the breaking of Ga-O bonds. During the pulse-off phase, the interfacial diffusion conditions are restored, and reaction products and locally accumulated ions are released in a timely manner. Through this periodic dissolution-recovery process, the surface passivation layer formed under continuous bias voltage is effectively overcome, promoting more uniform, continuous, and controllable local dissolution on the gallium oxide surface. Furthermore, through synergistic regulation with electrical parameters, a uniformly distributed and size-tunable porous structure is directly formed on a β-Ga2O3 substrate.

The application discloses a treatment method of mixed rare earth concentrate. The treatment method comprises the following steps: reacting the mixed rare earth concentrate with first hydrochloric acid to obtain a roasting ore and a roasting liquid; roasting the roasting ore to obtain a roasted ore; performing a first alkali dissolution reaction on the roasted ore and a first alkali solution to obtain a first alkali dissolution product; washing the first alkali dissolution solid product with water to obtain an alkali cake I and a washing alkali liquid I; precipitating sodium fluoride in the washing alkali liquid I to obtain sodium fluoride and residual alkali I; performing a second alkali dissolution reaction on raw materials comprising phosphorus-containing materials and a second alkali solution to obtain a second alkali dissolution product; washing the second alkali dissolution solid product with water to obtain an alkali cake II and a washing alkali liquid II; precipitating trisodium phosphate in the washing alkali liquid II to obtain trisodium phosphate and residual alkali II. The method can recover the fluorine element and the phosphorus element in the mixed rare earth concentrate respectively, and the obtained sodium fluoride and trisodium phosphate have high purity.

The application belongs to the technical field of battery materials, and specifically discloses a preparation method of battery-grade trimanganese tetraoxide. The application first mixes a complexing agent, a pH regulator and an ethanol aqueous solution to obtain a mixed solution; then the mixed solution is mixed with a manganese source to perform a complexing dissolution reaction; after the reaction is completed, oxygen is introduced into the mixed solution to sequentially perform an oxidation reaction, an induced hydrolysis assembly and aging, so as to obtain the battery-grade trimanganese tetraoxide; the complexing agent comprises one or more of glycine, sodium glutamate, ammonium acetate, triammonium citrate and aminotri (methylene) phosphonic acid. The preparation method provided by the application has the advantages of few steps, short path and low energy consumption; and the trimanganese tetraoxide obtained finally has the advantages of stable properties, high quality, high sphericity and high manganese content.

The present disclosure provides a non-isothermal wet atomic layer etch (ALE) process for etching polycrystalline materials, such as metals, metal oxides and silicon-based materials, formed on a substrate. More specifically, the present disclosure provides various embodiments of methods that utilize thermal cycling in a wet ALE process to independently optimize the reaction temperatures utilized within individual processing steps of the wet ALE process. Like conventional wet ALE processes, the wet ALE process described herein is a cyclic process that includes multiple cycles of surface modification and dissolution steps. Unlike conventional wet ALE processes, however, the wet ALE process described herein is a non-isothermal process that performs the surface modification and dissolution steps at different temperatures. This allows independent optimization of the surface modification and dissolution reactions.

The invention discloses a preparation method and application of a bismuth oxychloride / tungsten trioxide / carbon quantum dot composite photocatalyst, relates to the field of photocatalytic materials, and aims to solve the problem that an existing BiOCl / CQDs composite photocatalyst is insufficient in CO2 photocatalytic reduction performance. The method comprises the following steps: 1, preparing a WO3 nanorod; 2, mixing the lignin carbon quantum dot solution with ethylene glycol to obtain a mixed solution; 3, adding WO3, Bi (NO3) 3.5 H2O and KCl into the mixed solution together, stirring until dissolving, and reacting; and 4, naturally cooling the reaction kettle to room temperature, and washing and drying the obtained precipitate to obtain the BiOCl / WO3 / NLCQDs composite photocatalyst. The ternary composite catalytic system constructed by the invention has the advantage that the catalytic activity is obviously improved. The preparation method is used for preparing the bismuth oxychloride / tungsten trioxide / carbon quantum dot composite photocatalyst.

This invention discloses a combined process for restoring reservoir drainage and gas production channels using high-pressure drive and chemical dissolution, relating to the field of efficient oilfield exploitation technology. The process includes: S1, conducting production profile testing and sampling analysis of blockages in the target gas well to determine the type, distribution location, and reservoir physical parameters of the blockages, and preparing a corresponding chemical dissolving agent based on the analysis results. This invention couples the mechanical fracture-creating effect of high-pressure pulsed fluid with the cavitation effect and vibrational mass transfer effect of ultrasound. Based on the initial dissolution of blockages by the chemical dissolving agent, the stress waves generated by the high-pressure pulse expand the reservoir microfractures. Simultaneously, the collapse of microbubbles generated by ultrasound enhances the dissolution reaction rate, and the vibration promotes the dissolving agent's penetration into the micropores, achieving a synergistic effect of chemical dissolution and physical displacement, thoroughly removing blockages from the pore throats, and avoiding secondary precipitation of dissolution products.