72 results about "Dissolution reaction" patented technology

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 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 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.

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.

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.

This invention relates to a gas separation membrane for N2 / CH4 using a dual-selectivity mechanism and its preparation method. Chromium nitrate nonahydrate, an organic acid, acetylacetone, ethyl acetate, and acetone are mixed and dissolved to obtain a dark green solution. The dark green solution is poured into sufficient diethyl ether to precipitate the precipitate, which is then dried in a vacuum oven to obtain chromium cluster powder. An MXene colloidal solution is lyophilized to obtain MXene sheet material. Deionized water and chromium cluster powder are mixed to form solution A. The MXene sheet material is added to solution A to obtain mixture B. Mixture B is deposited onto nylon filter paper using vacuum filtration to form a gas separation membrane, which is then placed in a vacuum oven to activate the chromium clusters. A Cr-MXene gas separation membrane rich in Cr clusters between MXene sheets is prepared. The prepared membrane possesses both diffusion-selectivity and reaction-selectivity mechanisms, enabling efficient separation of the N2 / CH4 system.

The application provides a temperature gradient monitoring method and system for bismuth target dissolution reaction, relates to the technical field of data monitoring, and comprises the following steps: step 1, acquiring energy deposition density distribution data and nuclide activity data along the axial and radial directions inside the bismuth target, and converting the nuclide activity data into nuclide mass data at corresponding positions; step 2, based on the nuclide mass data, calculating the intensity of a photon source term generated by a spallation reaction inside the bismuth target and corresponding energy group division results, inputting the intensity of the photon source term and the corresponding energy group division results into a photon transport calculation model to perform photon transport calculation, and obtaining a photon radiation dose equivalent rate distribution outside the target body. The application eliminates radiation interference, accurately characterizes the three-dimensional non-uniform distribution of heat sources inside the bismuth target by dividing nested three-dimensional subspace domains, constructing a three-dimensional closed vortex loop and combining a comprehensive correction factor with a photoacoustic signal temperature effect correction, and realizes real and reliable monitoring of the axial and radial temperature gradients in the bismuth target dissolution reaction.

The invention provides a method for comprehensively recovering valuable metals from tungsten-containing waste residues difficult to treat, and belongs to the field of metal waste recycling. The method comprises the steps that tungsten-containing waste residue slurry, inorganic acid and an oxidizing agent are subjected to an acid leaching cobalt dissolving reaction, and a cobalt salt solution and acid leaching tungsten-rich residues are obtained after solid-liquid separation; carrying out solid-liquid mixing on the acid-leached tungsten-rich slag, a sodium-containing molten salt medicament and water, and roasting to obtain roasted slag; the roasting slag and water are subjected to a heating water leaching reaction, and tungsten-containing water leaching liquid and water leaching slag are obtained after solid-liquid separation; and pulping the water leaching residues, carrying out acid leaching iron dissolving reaction with inorganic acid and an oxidizing agent, and carrying out solid-liquid separation to obtain an iron salt solution and tantalum-niobium enriched residues. The efficient treatment method for the tungsten-containing waste residues difficult to treat comprises the steps of acid leaching of the recycled residues, fused salt roasting of the acid leaching residues, water leaching of the roasting residues and secondary acid leaching of the water leaching residues, efficient extraction of various resources in the recycled residues is achieved, the recycling rate and the treatment cost are both considered, and wastewater discharge is reduced by recycling water resources.

This invention discloses a hydrogen-assisted rechargeable battery method for hydrogen storage and production, belonging to the field of hydrogen energy storage and electrochemical energy storage technology. The method includes four core steps: battery assembly, circulating electrolyte supply, charging for hydrogen storage, and discharging for hydrogen production. During charging, hydrogen-containing gas is introduced into the cathode, where a hydroxide reaction occurs, and metal ion reduction and deposition occur at the anode, storing hydrogen energy as a metallic element in a solid state under normal pressure. During discharging, a metal oxidation and dissolution reaction occurs at the anode, and a hydrogen evolution reaction occurs at the cathode, generating hydrogen gas in situ and releasing hydrogen energy on demand. This invention eliminates the oxygen evolution reaction of traditional water electrolysis, using hydroxide coupled with metal oxidation-reduction to achieve hydrogen energy storage and release. It offers high storage safety, low reaction overpotential, high energy efficiency, and good cycle reversibility, solving the problems of poor safety, high energy consumption, and low energy efficiency in existing hydrogen storage technologies. It can be widely applied to renewable energy hydrogen production, large-scale hydrogen energy storage, and distributed hydrogen energy supply scenarios.

The invention discloses a solid waste-based self-healing mine filling material and a preparation method and application thereof, and belongs to the technical field of solid waste resource utilization, the solid waste-based self-healing mine filling material comprises the following components by weight: 35-40% of a solid waste-based material, 2-3% of a self-healing master batch A, 3-5% of a self-healing master batch B, 8-13% of semi-dry desulfurization ash, and 40-50% of tailing sand; when crack water seepage occurs after hydration of the solid-waste-based self-healing mine filling material is completed, a silanol group of sodium methyl silicate in the self-healing master batch B and dicalcium silicate and tricalcium silicate in the solid-waste-based cementing material are subjected to a dehydration cross-linking reaction, and anti-permeability silicate with an anti-capillary effect is formed; the excessive anti-permeability silicate is further dissolved and reacted by the polyether silicone oil to form a charge reduction-anti-permeability composite material, so that capillary channels are sealed while internal gaps are filled, and the compactness of the mine filling material hydrate is further improved.

The utility model discloses a kind of reaction devices for precious metal hydrometallurgy, it is related to precious metal reaction device technical field, including jar body and ultrasonic generator;Jar body: outer side top end is provided with feed shell, the top surface of the jar body is cooperatively installed with the bottom surface of jar cover, the bottom surface of the jar body is fixed with underframe, the both sides of the bottom surface of underframe are equipped with first motor, the output shaft of the first motor is connected with the bottom end of mixing frame, the bottom surface inside the jar body of the mixing frame, this reaction device for precious metal hydrometallurgy, by utilizing ultrasonic cavitation effect intensifies mass transfer process, combined with accurate temperature control and corrosion-resistant design, not only accelerate precious metal dissolution reaction, but also realize reaction-separation integrated operation, effectively reduce precious metal loss and chemical reagent consumption, make reaction device have efficient, energy saving, environmental protection and other comprehensive advantages, suitable for gold, silver, platinum and other precious metal high-purity refining.

The invention discloses a method for repairing a bolt with a rusted surface. The method comprises the following steps that the bolt with the rusted surface to be repaired is placed in a cleaning tank containing acid cleaning liquid; the sound velocity and the conductivity of tank liquid are monitored in real time through a cooperative sensing system arranged in a circulation loop of the cleaning tank; calculating the concentration of acid in the acidic cleaning solution and the concentration of dissolved iron generated by dissolution of the rust in real time; calculating the instantaneous dissolution reaction rate of the rust in the acidic cleaning solution; an end point of the cleaning process is determined based on a variation trend of the instantaneous dissolution reaction rate, and the cleaning step is terminated when the end point is reached. According to the method, the reaction rate is monitored in real time, the optimal end point of rust removal is automatically judged, it is guaranteed that rust is thoroughly removed, meanwhile, the situation that bolt base metal is damaged due to excessive cleaning is avoided, and therefore the high consistency of repairing quality is guaranteed.

The invention discloses a fluorine-containing silicon slag resource utilization method, and relates to the field of fluorine-containing silicon slag resource utilization. The method comprises the following steps: washing fluorine-containing silicon slag, and filtering to obtain crude silicon dioxide; adding excessive crude silicon dioxide into the ammonium bifluoride solution, stirring and dissolving, and filtering after reaction to obtain first filtrate; mixing and stirring part of the first filtrate with first ammonia water, and aging to obtain silicon dioxide gel seed crystals; mixing and stirring the silicon dioxide gel seed crystal and the remaining first filtrate, adding second ammonia water under the stirring condition, continuously stirring for ammonolysis reaction until crystallization is completed, and filtering to obtain a silicon dioxide filter cake and second filtrate; the fluorine-containing silicon slag is used as a raw material in the whole process route, and the raw material source is wide; the white carbon black product is synthesized by preparing the seed crystal, so that the product quality is high; the reaction conditions are mild, the raw materials are recycled, the comprehensive utilization degree is high, and no secondary waste is generated.

This invention relates to the field of water treatment technology and provides a precise carbon dioxide dosing device, including a carbon dioxide storage tank, a carbon dioxide vaporizer, and a high-efficiency mixing reactor. The carbon dioxide vaporizer is connected to the gas output end of the carbon dioxide storage tank and is used to vaporize the carbon dioxide supplied from the storage tank. The high-efficiency mixing reactor is connected to the carbon dioxide vaporizer and is used to perform bubble reaction and water-soluble reaction on the vaporized carbon dioxide. This provides efficient solutions for precise calculation of the target dosing value, precise control of the dosing amount, and rapid dissolution reaction of carbon dioxide, improving the accuracy of carbon dioxide dosing and increasing the reaction rate of carbon dioxide.

This invention relates to a method for improving vanadium leaching rate and vanadium extraction through pretreatment of vanadium-containing steel slag. The pretreatment includes the following steps: S1, mixing vanadium-containing steel slag with water, adding organic polyphosphonic acid compounds and anionic polyamino acid salts, and ball milling to obtain a primary slurry; S2, subjecting the primary slurry to magnetic separation to obtain magnetic and non-magnetic slurries; S3, introducing CO2 into the non-magnetic slurry for reaction, followed by gravity separation to obtain a light slurry enriched with CaCO3 and a heavy slurry enriched with vanadium; S4, subjecting the vanadium-rich heavy slurry to a dissolution reaction with an ammonium halide aqueous solution to obtain a calcium-containing liquid phase and a vanadium-rich solid phase. Vanadium extraction is achieved by carbonate leaching of the vanadium-rich solid phase. This invention significantly improves the vanadium leaching rate (>92%) by adding organic polyphosphonic acid compounds and anionic polyamino acid salts as grinding aids during ball milling, promoting the efficient release and enrichment of vanadium-containing minerals, and combining this with magnetic separation for iron removal.

This invention provides an effective method for generating electricity through a process that involves dissolving biomass to produce solid fuel. [Solution] A power generation method using a power generation system having a dissolution reactor, a fuel converter, a carbon dioxide separator, and a power generation cell, comprising: a biomass dissolution step, in which biomass is reacted with a dissolution reaction solution containing vanadium ions in the dissolution reactor to obtain a fuel liquid which is a solution in which cellulose and hemicellulose contained in the biomass are dissolved in the dissolution reaction solution; a fuel conversion step, in which the fuel liquid is brought into contact with a catalyst contained in the fuel converter to oxidize the sugar components contained in the fuel liquid and obtain carbon dioxide and a converted fuel liquid; an anode supply liquid acquisition step, in which the carbon dioxide separator recovers the carbon dioxide contained in the converted fuel liquid and obtains a converted fuel liquid with a reduced carbon dioxide content as an anode supply liquid; and a power generation step, in which the anode supply liquid is supplied to the anode of a power generation cell to generate electricity.

Provided herein are compositions and methods for removing a coating (e.g., an environmental barrier coating, EBC) from a substrate. The method of removing a coating from a substrate includes contacting the coating with a salt, the salt being a solid, by some method. The method also involves heating the coating and the salt to a temperature equal to or greater than the melting point of the salt, converting the coating to a dissolvable reaction product by fusion of the coating with the salt. Upon formation of the dissolvable reaction product, at least a portion of the coating is then removed from the substrate using an acid to dissolve the product.

The invention provides a micro cylindrical mirror array manufacturing method based on electrochemical corrosion, and belongs to the technical field of optical element precision manufacturing, and the method comprises the steps: cutting the surface of a substrate through a precision cutting technology to form an initial groove structure, then placing the initial groove structure in an electrolyte, constructing an electrochemical reaction system, and forming a micro cylindrical mirror array; applying an electric field to guide ions in the electrolyte to generate a selective dissolution reaction with the surface of the groove; and regulating and controlling process parameters of an electrochemical reaction system, so that the bottoms of the grooves are gradually rounded, bent and evolved under the driving of interface energy and the action of electrochemical kinetics, then the sections of the grooves evolve to form a cylindrical form with a target curvature, and finally, the micro cylindrical mirror array is obtained. The technical problems that in existing micro cylindrical mirror array manufacturing, a curved surface is difficult to construct accurately, the array consistency is insufficient, the process is complex, the material adaptability is poor, and products with high surface quality, controllable curvature radius and high array consistency cannot be efficiently obtained under the condition that a complex photoetching structure and high-energy beam processing are not needed are solved.

The application relates to the technical field of oilfield produced gas separation treatment, and particularly discloses a CO2 flooding produced gas pretreatment equipment for oil exploitation, which has the technical features that the pretreatment box body is internally fixedly connected with a flooding produced gas collecting tank at the rear side space, and a gas separation treatment box is arranged at the front side space in the inner cavity of the pretreatment box body. In the scheme, a multistage spraying structure is designed to atomize ammonia water solution, copper ammonia complex solution, sodium sulfite solution and sodium hydroxide solution in sequence, so that the flooding produced gas fully contacts and reacts with the atomized gas, the harmful gas in the flooding produced gas is comprehensively pretreated through a dissolution reaction and adsorption, and the treatment rate of the harmful gas is improved. In addition, the pretreatment station is loaded into a container frame structure, the pretreatment station can be moved along with the replacement of the oil flooding site, and the container frame structure can protect the mechanism for treating the harmful gas and the tank body for storing the flooding produced gas.

This invention discloses a method for recycling aluminum fluoride waste, belonging to the field of fluoride salt resource recycling technology. Addressing the problems of poor selectivity, high acid consumption, and low recovery rate in existing technologies for aluminum fluoride waste, this invention provides a selective separation method based on the principle that cryolite dissolves in aluminum salt solution while aluminum fluoride remains insoluble. The method includes: mixing aluminum fluoride waste with an aluminum salt solution, and conducting a selective dissolution reaction under specific temperature, pH, and liquid-solid ratio conditions, allowing cryolite and alumina to dissolve into the solution phase while aluminum fluoride remains insoluble; obtaining aluminum fluoride product and leachate through solid-liquid separation; the leachate can be further precipitated by adding fluoride salts to recover the cryolite product. This invention's method is simple, highly efficient, and produces high-purity products, achieving effective separation and resource utilization of the two valuable components in aluminum fluoride waste.

This invention relates to the field of photovoltaic module recycling, specifically disclosing a cooling system and method for an EVA stripping reaction tank used in photovoltaic module recycling. The system includes a dissolution reaction tank with a pressure relief port at the top and a reflux interface at the bottom; a pressure relief and condensation module, comprising a pressure relief valve and a condenser connected to the pressure relief port via a high-pressure pipeline; a filtration and purification module, comprising a filter tank connected to the condenser outlet; a circulation and reflux module, comprising a circulation pump connecting the filter tank and the reflux interface; and an intelligent control module, comprising a PLC controller and pressure and temperature sensors installed within the reaction tank. By constructing a closed-loop structure composed of the above modules and automatically controlling the system based on sensor signals via the intelligent control module, this system can safely release and efficiently condense the solvent vapor generated during the reaction, then purify and filter it before pumping it back to the reaction tank for recycling. This significantly reduces solvent consumption and operating costs while improving production safety and stability.

The utility model relates to the technical field of ore pulp leaching, and discloses an ore pulp leaching and dissolving reaction device which comprises a base, two supporting plates are fixed on the upper surface of the base, a reaction barrel is arranged between the two supporting plates, a fixing sleeve is fixed on the outer surface of the reaction barrel, and the fixing sleeve is rotatably installed on the supporting plates. A supporting plate is installed in the reaction barrel, a feeding hopper is installed on the supporting plate, a feeding opening is formed in the feeding hopper, a feeding cover is arranged at the feeding opening, a crushing mechanism is arranged in the feeding hopper, a discharging opening is formed in the supporting plate, a sealing cover is arranged at the discharging opening, and an installation plate is rotationally installed in the reaction barrel. By arranging the crushing mechanism, the mounting plate, the motor II and the stirring rod I, the added ore can be crushed by utilizing the crushing mechanism, so that the ore can be in full contact with a solution, the motor II drives the mounting plate to rotate, the mounting plate rotates to drive the stirring rod I to synchronously rotate, and the ore and the liquid in the reaction barrel can be stirred and mixed.

The present application belongs to the technical field of nonferrous metallurgy, and particularly relates to a method for strengthening bayer process dissolution of high-iron gibbsite-type bauxite by a reducing agent. The method comprises the following steps: (1) preparing a mixed ore slurry by mixing high-iron gibbsite-type bauxite, sodium aluminate circulating mother liquor and an organic acid reducing agent containing an alpha-hydroxy acid structure; (2) heating the mixed ore slurry to 210-250 DEG C to perform a dissolution reaction, obtaining a dissolution slurry and a dissolution residue, and washing the dissolution residue with hot water to obtain an iron concentrate. The method can realize conversion of aluminum goethite at a lower temperature in the bayer process dissolution process, improve the dissolution rate of aluminum, directly produce red mud with high iron grade and low aluminum content for iron resource recovery, shorten the process flow and reduce the process energy consumption.

This utility model discloses a high-efficiency dissolution reaction device, including a reactor, a stirring assembly, an oxygen pipe, and a reaction basket. The reactor is equipped with a feeding port. The stirring assembly includes a stirring motor and a stirring rod, the lower end of which is inserted below the liquid surface in the reactor cavity. The stirring motor drives the stirring rod to rotate around its own axis. The outlet end of the oxygen pipe is inserted into the reactor, supplying oxygen into the reactor. The stirring motor drives the stirring rod to rotate, accelerating the dissolution of oxygen in the acidic liquid within the reactor. The reaction basket is installed inside the reactor cavity, and the feeding port is connected to the reaction basket. The reaction basket is used to hold the metal material. The acidic liquid in the reactor permeates into the reaction basket through holes and reacts with the metal. This high-efficiency dissolution reaction device can improve the reaction efficiency between acidic liquid and metal in environments with high pH values, shorten the dissolution time, reduce hydrogen production, and enhance safety.

The invention relates to a method for separating platinum, palladium and rhodium from bromine water in an iron alloy, which comprises the following steps: 1) pretreating raw materials to obtain a ferrosilicon alloy; 2) preparing a pregnant solution; sequentially crushing and calcining the ferrosilicon alloy, and adding bromine water into the calcined product for dissolving reaction to obtain a pregnant solution; and (3) separating precious metals, sequentially carrying out ammonia water regulation and hydrochloric acid reaction on the pregnant solution to obtain platinum-rhodium liquid and precipitates, adding a reducing agent into the precipitates to obtain metal palladium, sequentially adding an oxidizing agent and ammonium chloride into the platinum-rhodium liquid to react to obtain rhodium-containing liquid and ammonium chloroplatinate precipitates, adding formic acid into the ammonium chloroplatinate precipitates, and introducing hydrogen to obtain metal platinum, sodium hydroxide, hydrochloric acid, DETA and formic acid are sequentially added into the rhodium-containing liquid for a reaction, and metal rhodium is obtained. The method is ideal in design, not only improves the dissolution rate of platinum, palladium and rhodium, but also improves the separation efficiency, and can meet the requirements of industrial production scale for recovering and refining platinum, palladium and rhodium in the iron alloy in the waste three-way catalyst, and the precipitation rate of platinum, palladium and rhodium reaches 99% or above.

A method for detecting 3-Monochloropropane-1,2-diol (3-MCPD) esters and Glycidyl esters (GE) in a sample containing refined, bleached, and deodorized palm oil (RBDPO) comprising: adding a predetermined amount of a first reagent containing Dibutyltin dilaurate to the sample and forming a mixture; heating the mixture containing the first reagent to a temperature between 55°C and 65°C for a predetermined period to initiate a reaction between the first reagent and the 3-MCPD esters and GE, forming reaction products containing target analytes; adding a second reagent comprising an ethanol-based solvent to selectively dissolve the reaction products and separating them from the RBDPO; wherein a separate ethanol layer is formed, the layer containing the target analytes; adding a third reagent comprising a dye solution to bind with the separated target analytes; wherein adding the third reagent to the separated target analytes, enables detection of the 3-MCPD esters and GE in the sample. A portable test kit is also provided herein.