60 results about "Dissolved iron" patented technology

The invention belongs to the technical field of hydrogen production by water electrolysis, and discloses a device and a method for hydrogen production by alkaline water electrolysis enhanced by active ions regulated and controlled by a magnetic field. An anode magnetic flow channel and an anode non-magnetic substrate in the electrolytic cell are integrally designed and are combined to form an anode magnetic field functional bipolar plate, and the anode magnetic flow channel is formed. In the electrolysis operation process, the migration behavior and spatial distribution of iron ions dissolved in the electrolyte are actively regulated and controlled by applying an external magnetic field to the anode region, so that the iron ion concentration of the electrolyte phase is not increased, and the main body structure and material system of the existing industrial electrolytic cell are not changed; and the dissolved iron ions are directionally enriched on an anode interface. Through the regulation and control, relatively high dynamic iron active site coverage can be maintained on the surface of the anode, the polarization loss of oxygen evolution reaction is reduced, and the efficiency and stability of the process of hydrogen production by alkaline water electrolysis under the conditions of high current density and wide load operation are improved.

The invention discloses a preparation method and application of a FeCo-MOF derived CoFe2O4 / biochar composite material, and belongs to the technical field of antibiotic wastewater treatment. The method comprises the following steps: (1) dissolving terephthalic acid in DMF (Dimethyl Formamide) to form a solution A, dissolving ferric salt and cobalt salt in DMF to form a solution B, mixing the two solutions, reacting, centrifuging, washing, drying and grinding to obtain a FeCo-MOF material; and (2) mixing the FeCo-MOF material with peanut shells, grinding, calcining the obtained mixed powder in an N2 atmosphere, and then grinding to obtain the FeCo-MOF derived CoFe2O4 / biochar composite material. When the prepared composite material is used as a catalyst to degrade OFL in a PMS system, the degradation efficiency reaches 79.78%-89.89%, and the degradation rate constant reaches 0.094 min <-1 >-0.139 min <-1 >.

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 invention provides a method for rapidly dissolving a zinc ferrite material and a resourceful treatment method. The method for rapidly dissolving the zinc ferrite material comprises the steps that S1, copper powder and an acidic copper sulfate solution are provided, the concentration of bivalent copper ions in the acidic copper sulfate solution is not smaller than 10 g / L, and the concentration of sulfuric acid in the acidic copper sulfate solution is not smaller than 80 g / L; s2, mixing the zinc ferrite material, the copper powder and the acidic copper sulfate solution together to obtain a zinc ferrite leaching solution; the mass ratio of zinc ferrite in the zinc ferrite material to the copper powder is less than 1: 0.27. According to the method, the dissolving time of zinc ferrite can be remarkably shortened, and zinc ferrite can be completely dissolved within 2-5 min.

The application is suitable for the field of nuclear power detection, and discloses a method and device for measuring the dissolved iron content in liquid lead bismuth, which comprises the following steps: S1, taking out the liquid lead bismuth and adding it into a test container, and heating the assembly to a set temperature; S2, injecting argon into the test container to remove other gases, and then inputting oxygen, and measuring the change of the dissolved oxygen concentration in the liquid lead bismuth through an oxygen detection sensor; S3, substituting the measured oxygen concentration change rate and the net oxygen addition rate into a differential equation to calculate the solubility product; and S4, deriving the dissolved iron content through the measured equilibrium oxygen concentration in the saturated iron and the solubility product obtained in step S3. The method for measuring the dissolved lead bismuth eutectic oxygen activity through the oxygen detection sensor is simple in operation, can quickly and accurately measure the dissolved iron content, and can keep the liquid metal system in a balanced state by adjusting the oxygen addition rate in the system, so that the experimental efficiency is higher.

This invention discloses a sulfur-nitrogen co-doped porous carbon-supported diatomic iron catalyst and its preparation and application. The preparation process involves: 1) dissolving iron dimer and zinc nitrate fully in methanol solvent, followed by ultrasonic dispersion to obtain a mixed solution; 2) dissolving an organic nitrogen source in methanol solvent, followed by ultrasonic dispersion to obtain a mixed solution, then adding this to the mixed solution from step 1), mixing thoroughly, centrifuging, washing, drying, and pyrolysis to obtain a dry powder; 3) mixing the dry powder with an organic sulfur source, grinding, and calcining at high temperature to obtain the sulfur-nitrogen co-doped porous carbon-supported diatomic iron catalyst. The synthesis method of this invention is simple, the raw materials are readily available, and the obtained sulfur-nitrogen co-doped porous carbon-supported diatomic iron catalyst can effectively form a structure with diatomic iron sites. Furthermore, an appropriate concentration of sulfur atom doping can effectively anchor the diatomic iron active sites, thereby regulating the coordination environment of the active center, exhibiting oxygen reduction reaction performance comparable to commercial Pt-based catalysts.

The invention discloses a Fe-doped Bi2SeO5 nano material as well as a preparation method and application of the Fe-doped Bi2SeO5 nano material. The preparation method comprises the following steps: dissolving ferric chloride hexahydrate, bismuth nitrate pentahydrate and sodium selenite according to a specific ratio by using a hydrothermal synthesis technology and taking pure water as a solvent, and stirring at the room temperature of 25 DEG C until a system is uniform, so as to obtain a precursor mixed solution of the Fe-doped Bi2SeO5 nano material; the mixed solution is subjected to a hydrothermal reaction and then is subjected to heat treatment in an air atmosphere, and the target Fe-doped Bi2SeO5 nano material is finally obtained by regulating and controlling parameters such as a precursor ratio, a hydrothermal reaction temperature, heat preservation time and heat treatment conditions through a system. The nano material is used for catalytic degradation of antibiotics in a PMS system, and has the characteristics of strong anti-interference capability, good tolerance to acid and alkali environments, remarkable catalytic effect, high stability and the like.

The application discloses a kind of magnetic foam structure composite material and its preparation method and application, belong to heat-conducting-wave-absorbing multifunctional material preparation technical field.The in-situ bubble assisted annealing process disclosed in the application is to dissolve iron nitrate, nickel acetate and polyvinylpyrrolidone in deionized water to obtain a mixed solution, then dry the solution to a viscous state, then place the viscous liquid in a tube furnace, pass inert gas and perform high-temperature annealing treatment to obtain the product.The application is simple to operate, has strong repeatability, low production cost, short cycle, is green and environmentally friendly, and can be prepared on a large scale.It can also prepare a series of magnetic foam structure composites by changing the feeding ratio and annealing temperature.The obtained magnetic foam has adjustable composition, texture, high thermal conductivity and wideband microwave absorption characteristics, and has good industrial application potential in heat management, microwave absorption and other fields.

A natural gas (NG) processing plant and method of operating the NG processing plant including: receiving feed NG, removing acid gas from the feed NG gas via a gas sweetening unit having an amine absorber column that absorbs the acid gas, collecting an amine sample in the gas sweetening unit, removing water from the feed NG via a NG dehydration system having a column vessel that contacts the feed NG with liquid desiccant including glycol to remove the water, collecting a glycol sample in the NG dehydration system, adding reagent water and ferrozine to each of the amine sample and the glycol sample, and measuring total dissolved iron via ultraviolet-visible (UV-Vis) spectrophotometry in each of the amine sample and the glycol sample.

The application discloses a preparation method of superfine gold powder for conductive paste, and the method comprises the following steps: firstly, adding chloroauric acid and ferric chloride into deionized water, then adding gelatin and heating and stirring to dissolve, and preparing a mixed solution; secondly, performing ultrasonic atomization on the mixed solution to obtain nanoscale gold-iron mist droplets, then performing calcination and decomposition, collecting gold-iron alloy nanopowder by using a hydrochloric acid solution, and soaking, filtering and drying to obtain superfine gold powder. By adding gelatin as a dispersant, more and more nanoscale gold-iron mist droplets with a more stable structure are formed, the size of the superfine gold powder is ensured, and the gelatin is utilized to prevent particle adhesion during the calcination and decomposition process, so that the gold-iron alloy nanopowder is spherical and cannot be aggregated, the gelatin decomposition is residue-free, the iron is collected and dissolved by using the hydrochloric acid, the dispersibility of the nanoscale gold particles is ensured, the superfine gold powder with a large specific surface area is obtained, the superfine gold powder is suitable for thick film conductive paste, and the method is simple in process, high in product yield, large in output, and easy for industrial production.

The invention discloses a catalyst for preparing sulfur through low-temperature oxygen-resistant reduction of SO2 as well as a preparation method and application of the catalyst, and belongs to the technical field of catalysts. The method comprises the following steps that under the condition of a low-frequency ultrasonic field, ferric salt and optional auxiliary metal salt are dissolved in water to be mixed to form a metal solution, and then the metal solution is added into nanoscale titanium dioxide to obtain a mixed material; performing ultrasonic oscillation stirring on the mixed material to obtain a precursor solution; carrying out microwave treatment on the precursor solution under a low-frequency microwave condition, then carrying out ultrasonic treatment, standing and aging at room temperature, and drying after aging to obtain a dried block; and grinding the dried block, and roasting to obtain the catalyst for low-temperature oxygen-resistant reduction of SO2 to prepare sulfur. The catalyst is prepared under the synergistic effect of microwaves and ultrasonic waves, the structure of the catalyst is optimized, and the catalyst has more uniform and smaller particle size, shows larger specific surface area, exposes more active sites and can be used under complex atmosphere conditions such as oxygen-containing, water-containing, hydrogen-containing and the like.

The invention relates to the technical field of electro-catalytic materials, in particular to a CeFe-coated C / NF self-supporting electro-catalytic material and a preparation method and application thereof.The preparation method comprises the steps that ferric salt, terephthalic acid and benzoic acid are dissolved in a mixed solution of N, N-dimethylformamide, ethyl alcohol and water, then a first hydrothermal reaction and calcination are conducted, and derivative powder of an Fe-based MOF precursor MIL-53 (Fe) is obtained; the preparation method comprises the following steps: adding derivative powder of a Fe-based MOF precursor MIL-53 (Fe), cerous nitrate hexahydrate and polyvinylpyrrolidone into a mixed solution of ethanol, ethylene glycol and water, and uniformly mixing to obtain a mixed solution; the foamed nickel is put into the mixed solution for a second hydrothermal reaction, and the CeFe-coated C / NF self-supporting electro-catalytic material is obtained. According to the method, monocarboxylic acid benzoic acid is adopted as a structure regulating agent to obtain an ultrathin nanosheet-shaped Fe-based MOF precursor MIL-53 (Fe) nanosheet with a controllable microstructure and a controllable crystal structure, the nanosheet is calcined and then loaded with CeO2 in situ, and the problems that in the prior art, an electrocatalyst is high in manufacturing cost, high in overpotential and low in catalytic activity are solved.

The invention discloses a platinum-iron-molybdenum catalyst with high activity and stability as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalysis. The preparation method comprises the following steps: dissolving ferric nitrate, ammonium molybdate and citric acid in water, mixing, and adjusting the pH value to be less than 1.0; carrying out water bath gelation on the solution, drying, and calcining in a tubular furnace to obtain an iron molybdate carrier; mixing a platinum source with the iron molybdate carrier, drying by distillation in an oil bath, and calcining in a muffle furnace after drying to obtain the platinum-iron-molybdenum catalyst. The platinum-iron-molybdenum catalyst prepared by the preparation method disclosed by the invention can show efficient catalytic activity and excellent stability in propane oxidation reaction no matter whether the platinum cluster prepared in advance or the precursor salt of direct wet impregnation platinum is loaded.

The invention discloses iron phosphate and a preparation method thereof.The preparation method of the iron phosphate comprises the steps that iron phosphate slag is dissolved with acid, and iron phosphate metal liquid is obtained; carrying out recrystallization and solid-liquid separation on the iron phosphate metal liquid, and washing the separated solid phase to obtain a washing material; mixing the sizing material with a cloth bag dust collection material, and carrying out solid-liquid separation to obtain an iron phosphate dihydrate filter cake; and sequentially drying and roasting the iron phosphate dihydrate filter cake to obtain the anhydrous iron phosphate. According to the invention, the cloth bag dust collecting material can be recycled by adopting lower energy consumption and a simpler process, so that the production cost is greatly reduced. Meanwhile, the cloth bag dust collection material is dehydrated, does not need to be dehydrated in the sintering process, and is doped among the iron phosphate dihydrate particles, so that the probability of forming hard agglomeration among the particles is reduced, and the particle consistency of the anhydrous iron phosphate product is improved.

Acrolein is a useful additive for treating hydrocarbon fluids, such as crude oil, for multiple purposes including, but not necessarily limited to, reducing or preventing microbial activity, scavenging hydrogen sulfide (H2S), and / or at least partially dissolving iron sulfide (FexSy). Acrolein can be stabilized against decomposition by mixing or combining it with at least one alkyl carbonate, which can also raise the flash point of the stabilized acrolein composition.

The invention discloses a method and a system for co-producing high-purity iron through a Bayer process and high-purity iron powder, and belongs to the field of metallurgical recycling and green chemical engineering. According to the method, residual alkali liquor and process waste heat in the Bayer process red mud are utilized, the ultrasonic cavitation effect is cooperated with sodium thiosulfate to serve as a Fe < 3 + > stabilizer, iron oxide in the red mud is selectively dissolved at the temperature of 80-100 DEG C, and meanwhile dissolution of Al2O3 is inhibited. And filtering the dissolved iron alkali liquor through a ceramic membrane, complexing and purifying the iron alkali liquor through EDTA (Ethylene Diamine Tetraacetic Acid), introducing the iron alkali liquor into a diaphragm electrolytic cell, directly electrolyzing to generate Fe (OH) 2 under the conditions that the pH is 10-11 and the current density is 3000-5000 A / m, and dehydrating and reducing to obtain iron powder with the purity of more than or equal to 99.5%. And the electrolytic residual liquid is returned to a reaction process after alkali is supplemented, and filter residues are recycled to a Bayer process dissolution section, so that full circulation of resources is realized. According to the method, the technical bottlenecks of high acid consumption and alkaline electrolytic iron of a traditional acid leaching method are broken through, and the energy consumption per ton of iron is only 2100 kWh and is reduced by 38% compared with that of a traditional process.

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.

A method for preparation of an iron salt battery electrolyte comprises: supplying FeCl3 into an agitated reactor containing a dilute solution of HCl having a pH less than 1; supplying elemental iron into the reactor such that the elemental iron reacts with iron(III) to form iron(II); monitoring the pH of reactor solution; using the monitored pH to control supplying additional HCl into the reactor in order to maintain a pH of the reactor solution less than 1; and converting excess Fe3+ to Fe2+ in an electrochemical cell having a membrane or separator between an anode and cathode by directing the reactor solution from the reactor through the anode. A flow rate of the reactor solution through the anode is controlled to obtain a final Fe3+ concentration in the anode outlet FeCl2 stream of 15% or less than 15% of a total dissolved iron concentration as the iron salt battery electrolyte.

The invention discloses an attapulgite / bimetal oxide composite material and a preparation method and application thereof, and relates to the technical field of heavy metal Cd (II) treatment.The preparation method comprises the following steps that 1, ferric salt and magnesium salt are dissolved in a water-based solvent to form a homogeneous solution, 2, attapulgite powder is added into the solution obtained in the step 1, stirring reaction is conducted under the alkaline condition, and the attapulgite / bimetal oxide composite material is obtained; carrying out solid-liquid separation, drying and grinding to obtain an attapulgite / double-metal hydroxide composite material; and (3) calcining the A-LDH obtained in the step (2) in an inert atmosphere, and cooling to obtain the attapulgite / bimetallic oxide composite material. According to the invention, A-LDH is synthesized by adopting a simple coprecipitation method, and ATP is uniformly distributed on the surface of FeMg-LDH. Therefore, along with the improvement of the dispersing performance of the A-H composite material in an aqueous solution, the aggregation behavior of LDH is obviously reduced, and after the A-LDO is further formed through high-temperature pyrolysis, the distribution area of each component is uniform, the pore structure is richer, and the adsorption effect is better.

The invention discloses a preparation method of a Fe-based catalyst for preparing ethanol through CO2 hydrogenation in the technical field of catalysts, which comprises the following steps: step 1) solution mixing: dissolving iron salt and a complexing agent in water and fully stirring to form a uniform solution, and aging and washing to obtain a material; (2) drying the solution: putting the material obtained in the step (1) into a drying oven, and carrying out drying operation to obtain a dried material; (3) calcining a precursor: calcining the material obtained in the step (2) in a muffle furnace in calcining equipment to obtain a catalyst; 4) atmosphere treatment: carrying out atmosphere treatment on the material obtained in the step 3) to obtain an active component iron species; and step 5) carrier loading: loading an active component iron species on the carrier to obtain the combined catalyst, the Fe-based catalyst which is mild in reaction condition, simple in preparation method, environment-friendly, energy-saving and high in economic benefit is obtained, and the Fe-based catalyst can be used in preparation of ethanol by hydrogenation of carbon dioxide.

The application provides a preparation method of an iron-zinc co-doped graphite-like wastewater self-purification catalyst and application thereof, and the method comprises the following steps: dissolving iron metal salt and zinc metal salt in deionized water, adjusting pH to form a solution A by using ammonia water, adding melamine to form a dispersion B after stirring, then adding an organic complexing agent, stirring, and then stirring to dryness in a water bath, and then drying in a blast drying oven, and finally uniformly grinding the obtained product and sodium bicarbonate, and then calcining, and grinding the obtained black solid to obtain the Fe 0 -Fe x C y @C catalyst. The preparation method is simple, requires low equipment, and the prepared Fe 0 -Fe x C y @C catalyst can effectively and rapidly remove organic pollutants such as bisphenols, ciprofloxacin and sulfamethoxazole in water without adding an oxidant; has excellent removal effect on difficult biodegradable organic pollutants at neutral room temperature, has high stability, and has very low metal ion dissolution rate.

The application relates to the technical field of catalyst materials, and discloses an oxide catalyst with cerium embedded in a zinc-iron spinel structure, a preparation method and application thereof. The preparation method comprises the following steps: dissolving iron salt, zinc salt and cerium salt in deionized water, and slowly adding an ammonium hydroxide solution; after stirring, a precipitate is formed, the solution is subjected to hydrothermal treatment, washing and drying to obtain a catalyst precursor; finally, sodium is loaded onto the prepared catalyst by an impregnation method, and the catalyst is calcined to obtain a zinc-iron spinel catalyst with cerium embedded therein. The catalyst prepared by the application has rich active sites, can promote the adsorption and activation of reaction gas, has high thermal stability, and finally exhibits excellent catalytic performance. The preparation method is simple, low in cost, and can be widely applied, and the final purpose is to efficiently and stably prepare light olefins and other high-value chemicals.

This invention provides an amorphous iron-manganese oxide cluster, its preparation method, and its application in enhancing methanogenesis through functional enzymes. It belongs to the interdisciplinary technical fields of environmental functional materials, waste biological treatment, and resource utilization. The invention first mixes manganese salt and hydrochloric acid solution to obtain a hydrochloric acid solution of manganese salt; dissolves iron salt in water to obtain an iron salt solution; mixes the hydrochloric acid solution of manganese salt and the iron salt solution, heats the mixture, and then adds isopropanolamine solution to react, obtaining amorphous iron-manganese oxide clusters. The dispersion of the above amorphous iron-manganese oxide clusters is added to mixed bacterial granular sludge for sequential activation and anaerobic digestion. This can serve as an enhancer and protectant for anaerobic microbial functional enzymes, eliminating the influence of intermediate acids on the methanogenesis process through chelation or adsorption. It can also increase the adenine triphosphate yield of methanogenic archaea, accelerate archaea growth, and balance the growth differences between archaea and acidogenic bacteria.

The invention relates to a chloride ion modified beta-type iron oxyhydroxide material, a preparation method and a method for separating hexafluoropropylene / octafluoropropane mixed gas, and belongs to the technical field of fluorine special electron gas separation and purification. The preparation method comprises the following steps: dissolving chloride of iron into a mixed solvent of ethylene glycol and water to obtain an iron salt solution; adding oxalic acid into the ferric salt solution to obtain a mixed solution; and reacting the mixed solution at 100-180 DEG C for 6-24 hours to generate a precursor, heating the precursor in an inert atmosphere to 150-250 DEG C, and calcining for 1-6 hours to obtain the chloride ion modified beta-type iron oxyhydroxide material. A set amount of chloride ions are introduced into a beta-FeOOH structure, the pore size distribution of beta-FeOOH can be regulated and controlled, the pore size of beta-FeOOH can allow hexafluoropropylene with small dynamic size to enter, octafluoropropane with large dynamic size is prevented from entering, and the requirement for separating and purifying hexafluoropropylene / octafluoropropane mixed gas through an adsorption method is met.

The invention provides a Na-containing spinel type iron-cobalt bimetallic catalyst and a preparation method and application thereof, and relates to the technical field of catalysts.The method comprises the steps that iron source soluble salt and cobalt source soluble salt are dissolved in deionized water, and ammonia water is added to prepare an alkaline mixed solution; the alkaline mixed solution is placed in a hydrothermal reaction kettle for a hydrothermal reaction, and an iron-cobalt bimetallic oxide reaction product is obtained; the iron-cobalt bimetallic oxide reaction product is subjected to suction filtration and washing with a NaOH-containing aqueous solution, the mass fraction of Na in the catalyst is controlled to be 0.1-3 wt.% by regulating and controlling the concentration and the volume of the NaOH aqueous solution for washing, and the Na-containing spinel type iron-cobalt bimetallic catalyst is obtained after drying. By regulating and controlling the mass fraction of Na in the catalyst, the directional regulation and control of product distribution in the CO2 hydrogenation reaction can be realized, and the product requirements of various different application scenes can be met.

A method for producing an iron chromium electrolyte, the method comprising leaching iron and chromium from a ferrochrome alloy using hydrochloric acid at an elevated leaching temperature. A crude iron chromium electrolyte comprising dissolved iron and dissolved chromium is produced. The crude electrolyte is purified and conditioned to produce a functional iron chromium electrolyte.

This invention provides an iron-modified magnesium slag-based amorphous iron hydroxide composite material, its preparation method, and a method for synergistically removing iron and manganese from acidic mine water, belonging to the technical field of mine water treatment materials. The preparation method of the composite material includes: dissolving iron salt in water to obtain an iron salt solution; adding undisturbed magnesium slag to the iron salt solution for a co-precipitation reaction; after the co-precipitation reaction is complete, performing solid-liquid separation, washing, and drying to obtain the iron-modified magnesium slag-based amorphous iron hydroxide composite material; wherein the undisturbed magnesium slag serves as an alkali source and silicon source to provide OH... ‑ The active silicate ions and the hydrolysis products of iron salts co-precipitate to form silicon-doped amorphous iron hydroxyl oxide. This invention yields a highly stable amorphous composite material with a specific surface area more than 18 times higher than that of undisturbed magnesium slag, exhibiting both slow alkalinity release and efficient adsorption catalysis.

The application discloses a method for treating acid in-situ leaching uranium groundwater by chemical and biological synergy, and belongs to the technical field of groundwater treatment. The method is characterized by adding an iron chelating agent to acid in-situ leaching uranium groundwater, chelating high-concentration ferrous ions to form stable iron chelates; then based on the dual effects of hydroxyl radical chemical oxidation of the continuous single-electron transfer pathway of the ferrous chelates and biological oxidation of acidophilic iron-oxidizing bacteria in the groundwater, chelates of ferric ions are rapidly formed and hydrolyzed to form ferric hydroxyl sulfate precipitates, thereby removing more than 90% of the dissolved iron and a small part of the sulfate in the acid in-situ leaching uranium groundwater; subsequently, a small amount of lime is used for neutralization, so that the discharge of pollutants such as uranium, manganese and nickel in the groundwater can meet the standards. The method can reduce the consumption of the lime used for neutralization and the generation of metal waste by more than 50% in the treatment of acid in-situ leaching groundwater, and is efficient, stable, economical and practical.

The present disclosure provides methods and compositions for dissolving iron sulfide deposits in aqueous systems. The method may include adding the composition to an aqueous medium. The composition may include a polycarboxylate polymer and / or a salt thereof. The composition may optionally comprise a solvent and / or an additive. The compositions and methods are useful for dissolving typical insoluble inorganic salts encountered in the oil gas, recovery, water, and processing industries.