110 results about "Ferrocyanide" patented technology

The invention discloses a micron-grade magnetic core coated ferrocyanide adsorbent for removing Cs ions in radioactive wastewater and a preparation method thereof. The adsorbent takes magnetic Fe₃O₄ as a core, the surface is coated with a dense SiO₂ single layer serving as a protective layer, and an active component is metal ion stabilized potassium ferrocyanide coated on the outer layer, wherein stabilized metal ions comprise Ti, Zn, Cu, Ni, Co, and Zr. The particle size of the adsorbent is 0.2-5 μm, the adsorbent in the outermost layer is conductive to improving the adsorption efficiency for Cs⁺ ions, and an external magnetic field is adopted for realizing solid-liquid phase separation. The preparation method comprises the following steps: coating a hydrated metal oxide of Ti, Zr or Co, Ni, Cu or Zn on the surface of Fe₃O₄SiO₂ to form a composite magnetic material, wherein the hydrated oxide performs hydroxyl polymerization reaction with the surface of SiO₂ to produce M—O—Si bonds to improve the bonding strength between M and the surface of SiO₂; and finally reacting the composite magnetic material with a potassium ferrocyanide solution to form the required composite adsorbent, wherein the metal ions M achieve the effects of stabilizing the ferrocyanide and also achieve a bridge effect for bonding the ferrocyanide and the composite magnetic material together.

The invention relates to an alkaline zinc-iron electrochemical flow cell. The alkaline zinc-iron electrochemical flow cell is composed of a battery module, an electrolyte storage tank, a circulating pump and a circulation pipeline, wherein the battery module is formed by connecting one single battery or more than two single batteries in series/in parallel; a positive electrode and a negative electrode adopt the same electrolyte, strong alkali serves as supporting electrolyte, carbon felts or carbon paper serves as the electrodes, a graphite plate serves as a current collecting plate to form the symmetric electrochemical flow cell; and the electrolyte of each of the positive electrode and the negative electrode is a mixed aqueous solution of ferrocyanide, zinc salt or/and zinc oxide and thestrong alkali. The symmetric alkaline zinc-iron electrochemical flow cell with the positive electrode and the negative electrode adopting the same electrolyte has the battery performance equivalent to that of a traditional alkaline zinc-iron electrochemical flow cell, meanwhile, due to the fact that the positive electrode and the negative electrode adopt the same electrolyte, the osmotic pressureof the electrolyte of the positive electrode and the electrolyte of the negative electrode is consistent, and therefore the problem of electrolyte migration caused by inconsistent osmotic pressure ofthe electrolyte of the positive electrode and the electrolyte of the negative electrode of the traditional alkaline zinc-iron electrochemical flow cell can be solved, and the maintenance cost of a system in the actual application process is effectively lowered.

The invention relates to a large-scale preparation method of high stability caesium removing adsorbent, a product of the preparation method and application of the product, in particular to transitionmetal-stabilized ferrocyanide adsorbent supported by particulate inorganic oxide or activated carbon. The transition metal-stabilized ferrocyanide adsorbent comprises a particulate inorganic oxide carrier or a particulate activated carbon carrier, a transition metal-stabilized ferrocyanide layer which coats the inorganic oxide carrier or activated carbon carrier and a polymer material layer coating the transition metal-stabilized ferrocyanide layer. The adsorbent has high crushing strength and a low ion leaching rate. The invention also relates to the preparation method of the adsorbent and the application of the adsorbent in removal of radioisotope Cs ions, stable-isotope Cs ions, radioisotope Rb ions and stable-isotopic Rb ions.

A preparation method for ferrocyanide zirconium Kalium taking bead silica gel as carrier relates to the preparation method for ferrocyanide zirconium Kalium with high specific surface and taking the bead silica gel as the carrier. In the method, fashioned porous bead silica gel react with the solution of zirconium oxychloride under the condition of heating and refluxing, acquired bead silica gel loaded with amorphous zirconium dioxide is dried and then dipped in the hydrochloric acid solution of yellow potassium ferrocyanide for reaction under stirring for 12-24 hours, thus the hybrid material of ferrocyanide zirconium Kalium with high specific surface and taking bead silica gel as the carrier is obtained. The load of ferrocyanide of the material can be adjusted and the material has strong adsorption capability for nuclide ion, high specific surface, good particle degree of sphericity, and being uneasy to break, which avoids the problem of oversized bed water resistance caused by using ferrocyanide zirconium Kalium particles separately; besides, owing to the existence of Zr-O-Si covalent bond, nano ferrocyanide zirconium Kalium particles can closely combine with the bead silica-gel, thus being uneasy to run away in the process of waste water treatment.

The invention discloses a composite anti-salt agent, which mainly comprises a ferrocyanide solubilizer A and a complexone B, and can further comprise a polymer lattice modifier C and/or water. According to the present invention, the composite anti-salt agent has a synergistic effect, wherein the ferrocyanide solubilizer A in the composite anti-salt agent can substantially increase the solubility of the salt, and provides the main effect of the composite anti-salt agent, the complexone B in the composite anti-salt agent has good complexation effects on metal ions and can change the metal ion concentration of the salt crystal so as to reduce the solubility product of the salt crystal, and the polymer lattice modifier C can change the compact structure of the salt into the loose structure soas to make the salt be easily carried away by the flowing of the solution. According to the present invention, the composite anti-salt agent can provide excellent salt crystallization prevention effect on salt solutions with highly mineralized sodium chloride, and further can provide good salt release effects on salt solutions with highly mineralized sodium chloride, calcium chloride and magnesiumchloride.

The invention relates to a synthetic method of an aryl cyanide in a water solution, which comprises the following steps: adding an aryl compound, a ferrocyanide and a phase transfer agent into an alkaline water solution, or adding the aryl compound and the ferrocyanide into a mixed solution of alkaline water and an organic solution; controlling the reaction temperature at 30 DEG C-140 DEG C; and synthesizing the aryl cyanide by catalytic coupling of a metal palladium catalyst. In the invention, the non-toxic environment-friendly ferrocyanide is used as a cyanide source for synthesizing the aryl cyanide, and water is used as an environment-friendly solvent to substitute the virulent cyanide and the organic solvent in the prior art, thereby solving the problem of environment pollution in the process of synthesizing the aryl cyanide. In the invention, good solubility of the ferrocyanide in the water and the strong polarity of the ferrocyanide are used, thereby greatly promoting the generation of the aryl cyaniding reaction, the cyaniding reaction can be finished at lower temperature (30 DEG C-140 DEG C), the reaction yield is high, and the application range of the aryl cyaniding reaction is improved.

The present invention relates to a continuous bipolar electrochemically based reactor for the purpose of destroying free cyanide by direct and indirect oxidation and removing its strong complexes like ferrocyanide and ferricyanide by electrocoagulation. The designed reactor consists of four main sections, including electrooxidation, hydraulic mixing, electrocoagulation, and precipitation tank. The order of sections results in having a combination of reactions which separately remove cyanide and its compounds. The designed reactor shows a high flexibility in terms of handling highly variable kinds and concentrations of cyanide in the industrial wastewater effluents.

A method is provided for synthesizing iron hexacyanoferrate (FeHCF). The method forms a first solution of a ferrocyanide source [A₄Fe(CN)₆.PH₂O] material dissolved in a first solvent, where “A” is an alkali metal ion. A second solution is formed of a Fe(II) source dissolved in a second solvent. A reducing agent is added and, optionally, an alkali metal salt. The first and second solutions may be purged with an inert gas. The second solution is combined with the first solution to form a third solution in a low oxygen environment. The third solution is agitated in a low oxygen environment, and A_X+1Fe₂(CN)₆.ZH₂O is formed, where X is in the range of 0 to 1. The method isolates the A_X+1Fe₂(CN)₆.ZH₂O from the third solution, and dries the A_X+1Fe₂(CN)₆.ZH₂O under vacuum at a temperature greater than 60 degrees C.

The invention discloses a low-water low-defect ferrocyanide manganese potassium Prussian blue cubic crystal and a preparation method thereof, and belongs to the technical field of material synthesis.The invention aims to solve the problems of [Fe (CN) 6] 4-defect and high crystal water of ferrocyanide manganese potassium Prussian blue mateials, and provides the low-water low-defect ferrocyanide manganese potassium Prussian blue cubic crystal. A chemical general formula of the low-water low-defect ferrocyanide manganese potassium Prussian blue cubic crystal is shown in the description, wherein1.9<=x<=2.1, 0<=y<=0.03, 0<=z<=0.2, and a mass content of crystal water is less than 1%. By the adoption of the low-water low-defect ferrocyanide manganese potassium Prussian blue cubic crystal and the preparation method thereof, soluble manganese salt and potassium ferrocyanide are used as raw materials; and by optimizing a complexing agent and the reaction temperature, an excessively fast precipitation reaction speed is effectively reduced, and crystal growth time is prolonged, so that defects and crystal water in the Prussian blue crystal are reduced, and the Prussian blue cubic crystal with high quality and near stoichiometric ratio is obtained.

The invention discloses a method for preparing a supported ferrocyanide bacterial cellulose membrane for adsorbing Cs+. The method is characterized by comprising the following steps: 1) pretreating abacterial cellulose membrane, and cutting the bacterial cellulose membrane into different sizes; 2) adsorbing transition metallic ions by using the bacterial cellulose membrane, soaking the bacterialcellulose membrane obtained in the step 1) into a transition metallic ion solution, and washing the surface of the bacterial cellulose membrane with distilled water; 3) supporting ferrocyanide on thebacterial cellulose membrane, soaking the bacterial cellulose membrane obtained in the step 2) into a potassium ferrocyanide solution, performing oscillation by using a table concentrator, and washingthe surface of the bacterial cellulose membrane with distilled water. The material prepared by using the method can be cut into different sizes according to demands, a ferrocyanide crystal is deeplyembedded into a fiber structure, and after treatment, the ferrocyanide is not liable to lose in the wastewater treatment process; the material has a relatively good adsorption property for radionuclide cesium ion, and meanwhile the problem that a bed layer has too large water resistance when the ferrocyanide is used independently is avoided.

The invention discloses a method for recovering gold from gold-containing barren solution and purifying the barren solution. In the method, sulfuric acid is added into gold-containing cyanide barren solution to perform acidification precipitation, pH value of the solution is regulated to be less than or equal to 2, ferrocyanide, copper, zinc and lead in the gold-containing cyanide barren solution are separated and removed from the gold-containing cyanide barren solution in a precipitate mode; lime is added into the separated acidic supernatant for neutralizing until the pH value is between 10 and 12, and formed calcium sulfate precipitate is removed; and a calcium removing agent is added into the separated basic supernatant, the formed precipitate is removed, and the separated supernatant is returned to the gold leaching process, wherein before the acidification precipitation step, a bactericide is added to the gold-containing cyanide barren solution, and the gold-containing cyanide barren solution is subjected to multi-medium filtration, microfiltration and first nano-filtration in sequence. According to the method for recovering gold from the gold-containing barren solution and purifying the barren solution, the dosage of acid agent is greatly reduced, and the treatment cost for the barren solution is reduced.

The invention comprises the specific steps: according to a principle of monolayer dispersion of salts on an oxide carrier surface, adopting an X ray diffraction method to determine a monolayer dispersion value of Mn <+> ion salt on a silica gel surface and taking the value as an optimal Mn <+> ion salt capacity. In the preparing of the adsorbent, silica gel particles are fully dipped with Mn <+> ion salt of certain concentration to load the Mn <+> ions on the silica gel surface to form a dispersion monolayer, and higher binding force exists between the Mn<+> ions and the silica gel; then an intermediate M/SiO2 is fully soaked with a potassium ferrocyanide solution to react potassium ferrocyanide with the Mn<+> ions on the surface, so as to generate a layer of ferrocyanide with stable M ions and higher binding force at the silica gel surface. Through static Cs<+> adsorptive property determining, fixed bed reactor cooling experiment determining and verification of a fixed bed reactor 137Cs radioactivity tracer test, the silica gel-carrying ferrocyanide adsorbent prepared by the method has well adsorptive property for Cs<+>.

The present invention relates to a radionuclide adsorbent, which includes a hollow space (specifically, an area which is entirely empty or in which transition metal oxide particles are present); and a transition metal-ferrocyanide shell (specifically, a transition metal-ferrocyanide shell having a structure in which a plurality of two-dimensional nano flakes overlap or a transition metal-ferrocyanide shell having a structure in which a plurality of three-dimensional nano polyhedrons agglomerate) formed on the space surface, a preparation method thereof, and a method of removing a radionuclide using the same.

A disclosed modified water-quality stabilizing agent is prepared from the following raw materials in parts by weight: 90-110 parts of water, 30-50 parts of polyaspartic acid, 5-10 parts of zinc sulfate, 20-35 parts of sodium polyacrylate, 4-12 parts of lignin, 25-35 parts of calcium gluconate, 6-10 parts of polyphosphate, 8-16 parts of sodium molybdate, 11-18 parts of benzotriazol, 15-25 parts of sodium silicate, 3-9 parts of ferrocyanide, 15-20 parts of isopropanol, 8-14 parts of calcium carbonate and 15-25 parts of glycol. The provided modified water-quality stabilizing agent is environment-friendly, less in usage amount, excellent in scale-inhibiting rust-inhibiting performances, and suitable for large-scale popularization.

The invention discloses a cobaltous ferrocyanide PVDF (poly(vinylidene fluoride)) hollow fibrous membrane as well as a preparation method and an use thereof. According to the preparation method, cobaltous ferrocyanide nanoparticles with high removal rate on caesium are loaded on the surface of the PVDF hollow fibrous membrane through intermediates of silicon dioxide by a chemical method. The aminated silicon dioxide used for preparation has the grain diameter being 300nm and the concentration being 0.05 percent to 0.5 percent (mass/volume); the loading layer number of the cobaltous ferrocyanide is three. The removal rate of the cobaltous ferrocyanide PVDF hollow fibrous membrane prepared by the method on the caesium within 6h can reach 99.5 percent or higher (the concentration of the silicon dioxide is 0.5 percent, and the caesium influent concentration is 100mu g/L). Meanwhile, the preparation process of the cobaltous ferrocyanide PVDF hollow fibrous membrane is simple; the cost is low; the caesium removal rate is high. Therefore wide application prospects are realized in caesium-containing water body treatment.

There is provided a method of producing a radioactive cesium decontaminator, including: suspending magnetic particles in a solvent, and coating each magnetic particle with organic monomer or polymer, to thereby form a precursor; adding a ferrocyanide aqueous solution and an aqueous solution containing at least one kind of transition metal into a suspension liquid containing the precursor after coating while applying a strong shear force, to thereby generate a radioactive cesium decontaminator; and removing water content from a slurry containing the obtained radioactive cesium decontaminator.

A transition metal hexacyanoferrate (TMHCF) battery electrode is provided with a Fe(CN)₆ additive. The electrode is made from A_xM_yFe_z(CN)_n.mH₂O particles overlying a current collector, where the A cations are either alkali and alkaline-earth cations such as sodium (Na), potassium (K), calcium (Ca), or magnesium (Mg), and M is a transition metal. A Fe(CN)₆ additive modifies the A_xM_yFe_z(CN)_n.mH₂O particles. The Fe(CN)₆ additive may be ferrocyanide ([Fe(CN)₆]⁴⁻) or ferricyanide ([Fe(CN)₆]³⁻). Also provided are a related TMHCF battery with Fe(CN)₆ additive, TMHCF fabrication process, and TMHCF battery fabrication process.

The invention belongs to the field of flow batteries, and particularly relates to an electrolyte of a water-based flow battery, an all-iron water-based flow battery and application of the all-iron water-based flow battery. According to the invention, ligands which are stably complexed with iron in an alkaline environment are respectively introduced into the positive electrode electrolyte and the negative electrode electrolyte, and the two ligands have different degrees of influence on the electron gaining and losing capabilities of iron ions or ferrous ions; a potential difference exists between a first complex contained in the positive electrode electrolyte and a second complex contained in the negative electrode electrolyte under the electrified condition, and the first complex is ferricyanide or ferrocyanide; the second complex is a complex formed by iron ions or ferrous ions and bis (2-ethoxyl) amino (trihydroxymethyl) methane or 3-[N-N-bis (2-ethoxyl) amino]-2-hydroxy propanesulfonic acid, so that the total-iron aqueous flow battery is constructed, and the flow battery realizes ion conduction through a cation exchange membrane Nafion series diaphragm and can stably and reversibly circulate for a long time.

A cellulose gel electrolyte material is prepared from natural cellulose wood pulp, paper pulp, bamboo pulp or degreased cotton, which are used as raw materials and react with sodium hydroxide and carbon disulfide to synthesize a cellulose viscose solution, and a gel-based cellulose gel electrolyte material is formed through hydration treatment. The preparation method comprises the steps of reacting paper pulp (wood pulp, bamboo pulp or degreasing cotton) with sodium hydroxide and carbon disulfide for 30-60 minute, preparing a tangerine viscose liquid, mixing the viscose liquid and deionized water according to the weight ratio of 1: 1-9, obtaining cellulose gel electrolyte material after gel curing, and preparing a composite cellulose gel electrolyte material if an acetonitrile solution ofpotassium ferrocyanide or potassium iodide and iodine is added. The method is simple, the product is easy to form, operation and control are simple and convenient, and industrial production is facilitated. The prepared cellulose gel electrolyte material is a porous gel polymer, has good liquid retention capability and ionic conductivity, and can be applied to a supercapacitor, a solar cell and a lithium battery.