22 results about "Ferrocyanide" patented technology

The present disclosure relates to a kind of ferric phosphate and its preparation method and use, the preparation method includes the following steps: (1) mixing ammonium ferrocyanide and phosphorus source, obtain iron-phosphorus mixed solution;(2) the iron-phosphorus mixed solution obtained in step (1) is carried out spray pyrolysis, obtain solid particles;(3) the solid particles obtained in step (2) are broken, obtain ferric phosphate.The ferric phosphate provided by the present disclosure has higher purity, tap density and specific surface area, the preparation method can avoid using pH regulator and surfactant, reduce by-product production and cleaning step, greatly simplify production process, have higher industrial application value.

This invention discloses a cathode material, its preparation method, and its application, belonging to the technical field of cathode materials for sodium-ion batteries. The cathode material has a core-shell structure, with a core of sodium manganese ferrocyanide and a shell of potassium manganese ferrocyanide; a manganese ferrocyanide intermediate layer is also present between the core and the shell. The intermediate layer contains Mn... 2+ The ionic radius is greater than that of the Na core. + Larger K atoms, with higher valence states, can reduce lattice spacing, thus supporting the structure and improving the material's cycling stability while inhibiting the absorption of water molecules; the K atoms in the outer shell... + Not only can it provide capacity, but also K + The ionic radius is also larger than that of Na. + Larger and wider ion transport channels result in a more stable structure, which also helps reduce the material's water absorption. The presence of the aforementioned intermediate layer and outer shell significantly improves the structural stability of the cathode material during charge and discharge, reduces side reactions between the cathode and electrolyte, and enhances interfacial stability, cycle performance, and rate performance.

The invention relates to an aqueous magnesium ion battery positive electrode material and a preparation method thereof, and belongs to the technical field of battery materials, the positive electrode material is a HE-MnZnFePBA-coated CNT composite material, HE-MnZnFePBA is a Prussian blue analogue doped with three metals of manganese, zinc and iron, CNT is COOH-MWCNT, and HE-MnZnFePBA grows on the surface of COOH-MWCNT in situ. According to the HE-MnZnFe PBAatCNT composite positive electrode material and the preparation method thereof, the prepared HE-MnZnFe PBAatCNT composite positive electrode material is doped with Mn, Zn and Fe, the Mn element can improve the electrochemical activity of the material and provide high-capacity contribution, and the Zn element can enhance the lattice stability and inhibit structural collapse in the circulation process; meanwhile, due to the introduction of the carboxylated multi-walled carbon nanotubes, the conductivity of the material is remarkably improved, the ion transmission resistance is effectively reduced, and slow growth of crystals is realized by adopting a slow coprecipitation method and controlling the solution dripping rate, the reaction temperature and the reaction time; meanwhile, the excessive sodium ferrocyanide ligand can perform in-situ vacancy repair on the crystal, so that lattice defects are reduced, and the structural integrity of the material is improved.

The invention discloses a magnetic composite adsorption material with a core-shell structure, a preparation method of the magnetic composite adsorption material and application of the magnetic composite adsorption material in radioactive waste oil treatment, and belongs to the technical field of adsorption material preparation and radioactive waste treatment. The composite adsorbent (Fe3O4 (at) SiO2 (at) TiO2 (at) KTiFe (CN) 6) is of a core-shell structure, Fe3O4 is a magnetic core layer, SiO2 is a middle protective layer, TiO2 is a titanium source functional layer, and KTiFe (CN) 6 ferrocyanide on the outermost layer is a Cs < + > selective adsorption active layer. High-selectivity capturing of Cs < + > in an organic solvent matrix simulating radioactive waste oil and rapid magnetic separation after treatment are achieved. The design strategy effectively overcomes the ubiquitous problems of poor dispersibility, difficult recovery, limited applicability and the like in the application of the traditional ferrocyanide adsorbent in a non-aqueous system.

A preparation method of carbon-doped iron phosphate, comprising the following steps: (1) mixing ammonium ferrocyanide, a phosphorus source and pyridine oxide to obtain an iron-phosphorus mixed solution; (2) performing spray pyrolysis on the iron-phosphorus mixed solution obtained in step (1) to obtain solid particles; (3) crushing the solid particles obtained in step (2) to obtain carbon-doped iron phosphate; and further applying the carbon-doped iron phosphate obtained by the above preparation method to prepare lithium iron phosphate.

The application discloses a kind of alkaline full iron liquid flow batteries and preparation method of electrode material.Its characteristics are: the positive electrolyte of the alkaline full iron liquid flow battery is with ferrocyanide as active substance, one or both of NaOH and KOH as supporting electrolyte, the negative electrolyte is with 3-[N-N-bis (2-hydroxyethyl) amino]-2-hydroxypropane sulfonic acid and ferric chloride reaction to form complex iron as active substance, one or both of NaOH and KOH as supporting electrolyte to form the alkaline full iron liquid flow battery.The application increases the reaction active site of positive and negative electrode electrolyte active substance on the surface of electrode respectively, so as to improve the charge-discharge capacity of liquid flow battery.

The invention relates to the technical field of preparation of inorganic-organic composite functional materials, and relates to a preparation method of an MFCs-coated E-ZrP composite adsorbent and a separation membrane thereof, and the method comprises the following steps: firstly, carrying out intercalation stripping on alpha-zirconium phosphate by using trihydroxymethyl aminomethane through a colloid assembly intercalation method to prepare a water-based E-ZrP dispersion liquid; then transition metal chloride and potassium ferrocyanide are sequentially introduced into the water-based E-ZrP dispersion liquid, metal ferrocyanide is generated through an in-situ reaction, and the MFCs-coated E-ZrP composite adsorbent is obtained; and blending the composite adsorbent with a high-molecular polymer, and preparing the MFCs-coated E-ZrP composite separation membrane by adopting a non-solvent induced phase separation technology. The composite adsorbent and the separation membrane prepared by the invention have high selective adsorption capacity and excellent structural stability on rubidium and cesium ions, and can be widely applied to the fields of separation and extraction of rubidium and cesium in salt lake brine, underground brine and geothermal water, removal of cesium ions in radioactive wastewater and the like.

The invention discloses a leaching method for reducing mercury leaching in mercury-containing gold ore, and belongs to the field of metal refining. The pH value of the mercury-containing gold ore pulp is adjusted to 11.5 or above, soluble ferrocyanate is added, and stirring and leaching are conducted. The concentration of CN <-> in the ore pulp is detected in the leaching process, and when the concentration of CN <-> is larger than 100 mg / L, a certain amount of soluble copper salt is added into the ore pulp to control the concentration of CN <-> to be smaller than 100 mg / L; and after leaching is finished, ore pulp is filtered to obtain a leaching pregnant solution of the mercury-containing gold ore, a leaching barren solution is obtained after precious metal in the pregnant solution is recycled, the Fe content in the leaching barren solution is detected, soluble ferrocyanate is supplemented according to the Fe content, and then the leaching barren solution returns to a leaching system to serve as slurry mixing water of the mercury-containing gold ore to be recycled. According to the method, the ferrocyanate which is safer and more environmentally friendly than cyanide is adopted as a leaching agent, compared with an existing method, the agent system is simplified, organic matter influencing the leaching index is not introduced, and leaching of Hg is greatly reduced.

Provided is a spinel-type lithium manganese oxide having improved long-term stability in charge-discharge cycles at high temperatures. SOLUTION: A spinel-type lithium manganese oxide containing ferrocyanide.

This invention relates to the field of vanadium redox flow battery electrolyte additives, and discloses a Prussian blue-like additive for vanadium electrolytes, its preparation method, and its application. The method includes the following steps: dissolving a first metal source, a second metal source, and a structural stabilizer in an acidic solution and uniformly dispersing them to obtain a uniform dispersion I; dissolving ferrocyanide and an organophosphonate in deionized water and uniformly dispersing them to obtain a uniform dispersion II; subjecting uniform dispersion II to continuous ultrasonic treatment, and adding uniform dispersion I dropwise to uniform dispersion II to obtain a Prussian blue-like precursor solution; and heat-treating the Prussian blue-like precursor solution to obtain the Prussian blue-like additive for vanadium electrolytes. Using this additive as a vanadium redox flow battery electrolyte can effectively improve the battery's discharge capacity and capacity retention.

The synthesis and uses of organic hexacyanoferrates is provided. The synthesis of organic hexacyanoferrates includes steps of reacting potassium ferrocyanide or potassium ferricyanide with a nitrogen-organic compound and then collecting the crystals formed therefrom. Compounds of the formula R3Fe(CN)6 are formed from potassium ferricyanide (K3Fe(CN)6), Compound of R4Fe(CN)6 are formed from potassium ferrocyanide (K4Fe(CN)6). Compounds of the formula R3FeH(CN)6, are formed by reacting R3Fe(CN)6 with hydrazine. Compounds of the formula R3FeH(CN)6 are formed from tri-potassium hydrogen ferrocyanide (K3HFe(CN)6).

The invention provides a copper smelting slag separation tailing-based thallium removal agent and a preparation method thereof, and the copper smelting slag separation tailing-based thallium removal agent is prepared by taking a copper smelting slag separation tailing matrix and ferrocyanide as raw materials through pretreatment, functional modification and aftertreatment. Researches show that the perferrocyanide (Prussian blue and analogues thereof) shows extremely high selectivity and adsorption capacity on monovalent cations such as Tl < + > and Cs < + >. The cubic lattice structure provides channels with matched sizes, so that the ions can be specifically captured. The solid theoretical and technical basis is provided for efficient thallium removal by modifying the solid waste through ferrocyanide.

The present application relates to the technical field of comprehensive utilization of waste heat, and discloses a salinity gradient power generation apparatus and method, and a water-electricity co-generation apparatus thereof. In the salinity gradient power generation apparatus and method provided in the present application, an anode and a cathode respectively undergo hydrogen oxidation and reduction reactions, the anode consumes hydrogen, the cathode generates hydrogen, and the hydrogen circulates between the cathode and the anode by means of pipes without net consumption, thereby efficiently utilizing salinity gradient energy, achieving an environmentally friendly process, and producing no carbon emissions; compared with redox reaction systems using Fe2+ / Fe3+ or ferricyanide / ferrocyanide, the system is free from the limitation of concentration polarization; compared with redox systems based on water electrolysis, lower overpotential and higher efficiency are achieved; and a small amount of H2 is used, with no safety risk and no net consumption throughout the system. The water-electricity co-generation apparatus based on the salinity gradient power generation apparatus of the present application can make full use of waste heat to produce fresh water and generate electricity simultaneously, achieving high efficiency and pollution-free operation.

The application relates to a kind of basic zinc iron single liquid flow batteries, battery module is formed by one section single battery or two or more single batteries in series or / and parallel, an electrolyte storage tank, a set of electrolyte circulating pump and pipeline composition;Negative electrolyte does not flow, only positive electrolyte flows.Carbon felt as electrode;Graphite plate as current collector.Positive electrolyte is ferrocyanide and strong alkali aqueous solution, and negative active material is zinc salt or zinc oxide and strong alkali reaction generated slurry.The zinc iron single liquid flow battery of the application only needs a set of electrolyte circulating device, the structure is simplified, the failure rate of system operation is reduced, the system maintenance and control cost are saved;The concentration of negative active material is greatly improved, the loss of system is reduced, and the energy efficiency of system is improved.

This invention relates to a method for the large-scale preparation of highly stable cesium removal adsorbents, as well as their products and applications. Specifically, this invention relates to a particulate inorganic oxide or activated carbon supported transition metal-stabilized ferrocyanide adsorbent, comprising: a particulate inorganic oxide support or a particulate activated carbon support; a transition metal-stabilized ferrocyanide layer coating the inorganic oxide or activated carbon support; and a polymer material layer coating the transition metal-stabilized ferrocyanide layer. This adsorbent exhibits high crushing strength and low ion leaching rate. This invention also relates to a method for preparing this adsorbent and its applications in removing radioactive isotope Cs ions and stable isotope Cs ions, as well as in removing radioactive isotope Rb ions and stable isotope Rb ions.

The present application relates to a kind of valuable metals and cyanide in cyanide leaching gold lean solution are recovered in alkaline conditions step by step, by calcium precipitation, zinc precipitation, aluminum reduction, aluminum precipitation and iron precipitation etc. To cyanide leaching gold lean solution is handled, the removal and recovery of calcium, zinc, copper, aluminum and ferrocyanide in lean solution are realized step by step.This application realizes the removal of calcium, zinc, copper, aluminum and ferrocyanide in lean solution step by step by the coupling of ferrous precipitation and aluminum reduction in alkaline conditions, effectively recycles high-grade zinc mud, copper mud and iron mud.The method solves the problem of producing toxic hydrogen cyanide and copper needs to be refined in the treatment of cyanide leaching gold lean solution by acidification-volatilization-neutralization method and sulfidation-acidification-recycling-concentration method, and completes the resource utilization of lean solution.This method of recovering valuable metals and cyanide in cyanide leaching gold lean solution step by step in alkaline conditions has important significance and value for the resource utilization, green production and environmental protection of cyanide leaching gold lean solution.

The application provides a preparation method and application of Prussian blue and activated carbon-Prussian blue material. The preparation method of the Prussian blue comprises the following steps: adding a reducing agent to an aqueous solution containing ferricyanide complex for reduction treatment, so that the ferricyanide complex is reduced into ferrocyanide, and a ferrocyanide solution containing ferrocyanide and other reducing substances is obtained; adding a first iron salt solution to the ferrocyanide solution for de-reduction treatment, so that the other reducing substances contained in the ferrocyanide solution are removed, and a ferrocyanide ferrous carbonate precipitate and a post-precipitation liquid containing ferrocyanide are obtained through solid-liquid separation; and adding a second iron salt solution to the post-precipitation liquid for post-treatment, so that the ferrocyanide reacts with iron ions to obtain a Prussian blue slurry. The preparation method provided in the examples of the application can reduce the impurity content of the Prussian blue, improve the purity of the Prussian blue, and is beneficial to the preparation of activated carbon-Prussian blue material with better energy absorption performance.

This invention discloses a highly selective ion network adsorption material for cesium removal, its preparation, and its application. The adsorption material comprises a ferrocyanate ionic liquid and a polymer matrix. The polymer matrix is ​​selected from any one or more of covalent organic frameworks, polyimides, and alginate polymers. The molecular formula of the ferrocyanate ionic liquid is [N...]. n111 ] x M[Fe(CN)6] has a cation structure consisting of a quaternary ammonium cation with a long alkyl chain and a transition metal ion, and an anion consisting of a ferrocyanate anion. This invention solves the problems of low selectivity, small adsorption capacity, poor chemical stability, and environmental risks associated with existing technologies in high-salt environments. This ion network adsorbent material exhibits advantages such as high stability, excellent adsorption selectivity, and high adsorption capacity, demonstrating extremely high cesium adsorption selectivity and considerable adsorption capacity in high-salinity nuclear wastewater solutions.

The invention discloses a preparation method of a sodium ion battery Prussian blue positive electrode material. Comprising the following steps: dissolving ferric salt, sodium citrate and ascorbic acid in deionized water to obtain a solution A; dissolving ferrocyanide, sodium citrate and ascorbic acid in deionized water to obtain a solution B; sodium salt and polyvinylpyrrolidone are dissolved in deionized water, and a solution C is obtained; slowly adding the solution A and the solution B into the solution C, and centrifugally collecting precipitates after reaction; drying the precipitate in a vacuum drying oven to obtain initial Prussian blue powder; and further putting the obtained powder sample into a tubular furnace, and carrying out high-temperature annealing in an argon atmosphere to finally obtain the high-stability sodium ion battery Prussian blue positive electrode material. The required raw materials are simple, the cost is low, the process repeatability is high, the equipment requirement is relatively low, batch production is easy to realize, the obtained product is an optimized sodium ion battery Prussian blue positive electrode material, and the sodium storage specific capacity and the cycling stability are obviously improved.

The application discloses a nitrogen vacancy-rich ferrocyanide coupled cobalt catalytic electrode and a preparation method thereof, which comprises a base electrode, a carrier layer and an active layer which are sequentially coated on the base electrode; the carrier layer is an Fe2N layer, and the active layer is a cobalt elementary sub-nanometer cluster layer; the loading capacity of the cobalt elementary sub-nanometer cluster layer is 50-600 μg / cm 2 The ferrocyanide coupled cobalt catalytic electrode has high activity and high stability, can construct a bifunctional synergistic catalytic system of "nitrogen vacancy stable active hydrogen + cobalt cluster activated C-Cl bond", and improves the electrochemical reduction dehalogenation efficiency on halogen-containing organic pollutants.

The invention discloses a method and device for preparing lithium hexacyanoferrate and lithium fluoride through an electrolytic method, and relates to the technical field of compound preparation. The invention discloses a method for preparing lithium hexacyanoferrate and lithium fluoride by an electrolytic method. The method comprises the following steps: (1) dissolving a raw material containing lithium hexacyanoferrate to obtain a lithium salt solution with the concentration of 0.5-5 mol / L; (2) the lithium salt solution is pumped into an anode chamber of an electrolysis device, deionized water is pumped into a cathode chamber, voltage is applied for electrolysis, after electrolysis is finished, a lithium hexacyanoferrate solution is obtained in the anode chamber, and a lithium hydroxide solution is obtained in the cathode chamber; (3) pumping the lithium hydroxide solution in the cathode chamber into a fluorination reactor, and then adding electronic-grade hydrofluoric acid to carry out fluorination reaction; and (4) washing, filtering and drying the mixed solution in the fluorination reactor after the fluorination reaction to obtain the lithium fluoride. The method can be used for preparing the lithium hexacyanoferrate solution and the lithium fluoride powder at the same time, and is suitable for a scene with collaborative production requirements on two lithium compounds.

The application discloses a method for selectively leaching lithium from lithium iron phosphate black powder, and the method comprises the following steps: S1, preparing lithium iron phosphate black powder and lithium ferricyanide leaching solution; S2, mixing and reacting the lithium iron phosphate black powder and the lithium ferricyanide leaching solution to obtain a solid-liquid mixture of lithium phosphate and ferrocyanide solution; and S3, performing solid-liquid separation on the solid-liquid mixture to obtain lithium phosphate residue and ferrocyanide solution. The technical scheme can improve the lithium leaching rate while reducing the iron leaching rate.