34 results about "Ferrocyanide" patented technology

The invention relates to the technical field of all-vanadium redox flow battery electrolyte additives, and discloses a Prussian-blue-like additive for a vanadium electrolyte as well as a preparation method and application of the Prussian-blue-like additive. Comprising the following steps: dissolving a first metal source, a second metal source and a structure stabilizer in an acid solution, and carrying out uniform dispersion treatment to obtain a uniform dispersion liquid I; dissolving ferrous cyanide salt and organic phosphonate in deionized water, and carrying out uniform dispersion treatment to obtain a uniform dispersion liquid II; performing continuous ultrasonic treatment on the uniform dispersion liquid II, and dropwise adding the uniform dispersion liquid I into the uniform dispersion liquid II to obtain a prussian blue-like precursor liquid; and carrying out heat treatment on the Prussian blue-like precursor solution to obtain the Prussian blue-like additive for the vanadium electrolyte. And the material can be used as an all-vanadium redox flow battery electrolyte additive to effectively improve the discharge capacity and the capacity retention ratio of the battery.

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 the field of compound preparation, and discloses a method for preparing alkali metal ferrocyanide by using iron powder as an iron source through a mechanochemical method, and the method comprises the following steps: mixing the iron powder with a solution containing alkali metal cyanide to obtain a mixture, and enabling the water content of the mixture to be not more than 50wt%, the alkali metal cyanide comprises sodium cyanide or potassium cyanide, the reaction time is short, the reaction temperature is low, the process of treating the raw materials in advance is omitted, hydrolysis of the sodium cyanide is reduced, side reactions are reduced, a small amount of NH3 is released in the complexing reaction process, and the method is suitable for industrial production. The yield is high, sulfate containing ferrocyanide is not produced as a byproduct, and unreacted metal residues are recycled. Compared with a traditional method, the method disclosed by the invention is low in production cost and high in added value of products, and has a relatively good industrial prospect.

The invention relates to an online recovery method for an electrolyte of an alkaline total-iron flow battery, and belongs to the technical field of flow batteries. Aiming at the problem of capacity fading caused by consumption of positive oxidation-state substances due to spontaneous reduction of positive ferricyanide into ferrocyanide and permeation of negative polyhydroxy organic ligands of an alkaline total-iron flow battery, a chemical and electrochemical coordinated regulation strategy is provided; and the concentration of the oxidation-state ferricyanide in the positive electrode electrolyte is dynamically monitored and accurately adjusted in the operation process of the battery. According to the method, dynamic balance regulation and control of oxidation state / reduction state substances in the electrolyte are realized through an in-situ chemical or electrochemical regeneration means on the basis of a positive and negative electrode capacity matching relationship, so that the positive electrode electrolyte is repaired on line, and quantitative and controllable capacity recovery of the alkaline all-iron flow battery is realized. According to the technology, the stable cycle life of the battery can be greatly prolonged, the problem of electrolyte failure caused by polyhydroxy ligand migration is solved, the maintenance cost is reduced, and a key technical support is provided for practicability of the alkaline all-iron flow battery in a large-scale energy storage system.

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 invention discloses a method for preparing Prussian blue from cyanidation tailing cyanide, and belongs to the technical field of cyanide. The preparation method of the prussian blue comprises the following steps: (1) putting cyanidation tailings into a ball mill, carrying out ball milling, then adding deionized water, and carrying out stirring and mixing, so as to obtain ore pulp; the method comprises the following steps: under a closed condition, adjusting the pH value to 2.5-3.5 by using sulfuric acid, reacting for 1-2 hours, dissolving ferrous sulfate heptahydrate in deionized water to obtain a ferrous sulfate aqueous solution, introducing HCN gas into the ferrous sulfate aqueous solution, adjusting the pH value to 9.5-10.5, and stirring for reacting for 1-2 hours to obtain ferrocyanide; (2) a cation collecting agent and ferroferric oxide powder are added into the ferrous cyanide salt, stirring and uniform mixing are conducted, then magnetic flotation separation is conducted, and Prussian blue concentrate is obtained; and the Prussian blue concentrate is filtered, washed and dried, and Prussian blue is obtained. The purity and yield of the Prussian blue prepared by the method disclosed by the invention are relatively high.

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.

The invention relates to the field of compound preparation, and discloses a method for preparing ferrocyanate by taking ferrous oxide as an iron source, the method comprises the following steps: contacting a raw material A containing ferrous oxide with a solution B of alkali metal cyanide, and reacting at 40-80 DEG C to obtain the ferrocyanate, the alkali metal cyanide comprising sodium cyanide and / or potassium cyanide. According to the method for preparing the ferrocyanate, sulfate containing ferrocyanide is not byproduct, the reaction temperature is mild, the cyanide hydrolysis phenomenon is basically avoided, the yield is high, NH3 and H2 are not released in the reaction process, the process is safe, and the method is a green process which is economical and reasonable in atom, free of byproduct and free of waste gas, waste residues and waste water. Compared with the traditional method, the method provided by the invention has the advantages of almost no three wastes, low production cost, high added value of products and better industrial prospect.

The invention discloses a ferrocyanide radical cyclic regeneration assistance-based high-salt water body stable electrolytic hydrogen production method, and belongs to the field of water electrolysis hydrogen production. The method comprises the following steps: adding a ferrocyanide solution into an anolyte storage tank, taking a pretreated graphite felt as an anode, and replacing a traditional oxygen evolution reaction with a ferrocyanide anode oxidation reaction; and a chlorine-resistant reduction catalyst is added into the anolyte storage tank, so that a ferrocyanide oxidation product ferricyanide is efficiently reduced into ferrocyanide, and closed-loop circulation of the redox couple in the system is realized. According to the method, the ferrocyanide anodic oxidation reaction which is lower in theoretical oxidation potential and more advantageous in dynamics is introduced to replace the oxygen evolution reaction, the potential difference with the chlorine evolution reaction is greatly enlarged, and the selectivity under the conditions of large current and high chlorine concentration is improved. Meanwhile, the chlorine-resistant reduction catalyst is added into the anolyte storage tank and heated to catalyze the reduction and regeneration of ferrocyanide radicals, and continuous and stable low-power-consumption hydrogen production can be realized without continuously adding substances.

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 method of producing a selective zeolite sorbent for decontamination of liquid radioactive waste includes placing a preheated granular zeolite carrier into a vacuum chamber, followed by evacuation of air from the vacuum chamber, followed by injection of a solution containing ferrocyanides into the vacuum chamber, thereby drawing it into the pores of the carrier and creating active centers for selective sorption of cesium and strontium ions.

The application relates to an electrolyte and a preparation method thereof, a zinc-iron flow battery, a power utilization device and an energy storage device. The components of the electrolyte include ferrocyanide, alkali, a catalyst and water. The catalyst includes a compound with the following structural formula: wherein each R is independently 4-carboxyl phenyl, 4-sulfonic acid phenyl, 4-amino phenyl or 4-phosphorous acid; and M is iron (III), cobalt (II), manganese (II) or nickel (II). The electrolyte is beneficial to electron and proton transfer, can effectively reduce an electrochemical reaction energy barrier, thereby improving an electrochemical reaction rate and ionic conductivity, and further improving battery energy efficiency and reducing voltage loss.

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.

The invention discloses an energy-saving and less-manganese-residue decoupling electrolytic manganese preparation system and method. The system comprises a cathode chamber and an anode chamber which are separated by a proton membrane, cathode electrolyte for manganese reduction is circularly introduced into the cathode chamber, and a reduction reaction for manganese deposition is carried out; an inert anode is adopted in the anode chamber, and a preferable oxidation-reduction medium is introduced to carry out rapid electrode reaction on the inert anode, so that oxygen is prevented from being separated out from the anode. According to the method disclosed by the invention, by virtue of a strategy of separating cathode and anode electrolytic bath liquid and introducing redox mediation on an anode side, ferricyanide / ferrocyanide is used as an electron mediator between anode half electrolytic baths, so that more favorable dynamic half reaction is realized, the bath voltage is effectively reduced, and the consumption of electric energy and the electrodeposition efficiency of manganese are greatly reduced; and the generation of manganese deposition byproducts is effectively eliminated.

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.