50results about "Complex cyanides" patented technology

The invention relates to a production method of high-purity potassium aurous cyanide, which comprises the steps of gold pretreatment, electrochemical reaction, cooling crystallization and washing and drying, the washing is realized based on the following washing equipment, the washing equipment comprises a washing tank, and the washing tank is provided with a first water inlet pipe; the mixing mechanism comprises a mixing pipe which is rotationally installed, the mixing pipe is in transmission connection to the output shaft end of a driving motor in a gear meshing transmission mode, and the driving motor is connected with a gear through a corresponding one-way bearing; the mixing pipe is of a hollow tubular structure, the backflushing mechanism comprises a second water inlet pipe communicated with the mixing pipe through a corresponding rotary joint, and the mixing piece is of a hollow tubular structure or a hollow plate-shaped structure and is communicated with the mixing pipe; the tail end of the lower side of the mixing part is arranged in a necking shape and is bent towards the same direction to be connected with corresponding nozzles, and the bending direction of the nozzles is opposite to the rotation direction of the mixing pipe driven by the driving motor; and a suction filtration mechanism. On the basis of ensuring the washing quality, the washing frequency is reduced, the washing efficiency is improved, and the vacuum filtration efficiency is further improved.

The invention provides a process for removing cyanide from a cyanide-bearing aqueous fluid, the process comprising: (i) adding a solid composition comprising a first mixed-metal cyanide complex comprising copper and iron to a cyanide-bearing aqueous fluid comprising free cyanide and metal-complexed cyanide, wherein at least a portion of the first mixed-metal cyanide complex dissolves, with complexation of the copper by the free cyanide, to produce an aqueous solution comprising cyanometallates, the cyanometallates comprising copper cyanide and iron cyanide complexes derived from the first mixed-metal cyanide complex; (ii) contacting the aqueous solution with an anion-exchange absorbent to absorb the cyanometallates, thereby producing a cyanide-lean aqueous fluid; (iii) extracting the anion-exchange absorbent comprising the absorbed cyanometallates with at least one non-acidic aqueous extractant to produce an aqueous extract comprising the copper cyanide and iron cyanide complexes; and (iv) acidifying the aqueous extract to produce a precipitate comprising a second mixed-metal cyanide complex comprising copper and iron.

The present invention provides a nano-sized metal complex in which volume change on the occasion of temperature change is suppressed. The present invention pertains to a metal complex that has a crystallite diameter of 60 nm or less and is represented by general formula (1).　Formula (1): (M1)p[(M2)q(CN)6•nH2O (in the formula, M1 represents at least one item selected from the group consisting of Ag (I), Au (I), and Cu (I), M2 represents at least one trivalent transition metal, p is a positive number between 2.5 and 3.5 inclusive, q is a positive number between 0.5 and 1.5 inclusive, p + q is a positive number between 3.5 and 4.5 inclusive, and n is 0 or a positive number).

The invention discloses a copper cyanoaurate hexagonal sheet loaded cuprous oxide material as well as a preparation method and application thereof. The copper cyanoaurate hexagonal sheet loaded cuprous oxide material comprises a copper cyanoaurate hexagonal sheet and cuprous oxide loaded on the copper cyanoaurate hexagonal sheet. According to the preparation method, copper ammonium chloride and potassium cyanoaurate are taken as raw materials, a copper cyanoaurate hexagonal sheet is prepared by a hydrothermal method, and then cuprous oxide is loaded on the copper cyanoaurate hexagonal sheet, so that the copper cyanoaurate hexagonal sheet loaded cuprous oxide material is obtained. The invention provides application of the copper cyanoaurate hexagonal sheet loaded cuprous oxide material as a catalyst for electrocatalytic reduction of carbon dioxide, and provides a gas diffusion electrode, and the catalyst in the gas diffusion electrode is the copper cyanoaurate hexagonal sheet loaded cuprous oxide material. The preparation process is simple and environment-friendly; the prepared material has higher ethylene selectivity and stability in the reaction of electrocatalytic reduction of carbon dioxide.

The present invention relates to a particulate composite metal cyanide complex catalyst wherein: the 50% cumulative volume particle diameter of the composite metal cyanide complex catalyst is 0.01-4.0 µm as determined from the volume-based cumulative particle size distribution obtained by a laser diffraction scattering method; and the content of the particles having a particle diameter of 11 µm or more relative to the total volume of the composite metal cyanide complex catalyst is 10 vol% or less.

The invention relates to the technical field of flow batteries, in particular to a Fe-free Prussian blue analogue, a preparation method thereof and a solid energy storage material. The chemical composition of the Fe-free prussian blue analogue is Va [M (CN) b] c, wherein V exists in a form of one or a mixture of more than two of V < 2 + >, V < 3 + >, VO < 2 + > or VO < 2 + >; wherein M is one or two of Co and Ni, when M is a mixture of Co and Ni, the molar ratio of Co to Ni is (3: 1)-(1: 3), and the molar ratio of M to V is (1: 2)-(1: 5); trivalent cobalt is partially reduced, the molar weight ratio of trivalent nickel to divalent nickel is less than or equal to 0.3: 1, and V, M and cyanide ions form a three-dimensional network crystal through coordinate bonds. The Fe-free Prussian blue analogue is prepared from hexacyanocobaltate and / or tetracyanonickelate through a direct coordination method with a vanadium ion salt solution after valence regulation, and the technical problems that an existing solid energy storage material is poor in reversibility, low in voltage efficiency and the like can be solved.

A system and method for implementing and manufacturing a hierarchy system for use with a TMCCC-containing electrically-conductive structure (e.g., an electrode) as well as methods for use and manufacturing of such structures and electrochemical cells including these devices. Structures and methods include a coordination complex having LxMyNzTia1Va2Cra3Mna4Fea5Coa6Nia7Cua8Zna9Caa10Mga11[R(CN)6]b (H2O)c;. The method includes binding electrochemically active material to produce a hierarchical structure, the hierarchical structure having a plurality of primary crystallites having a size D1, the plurality of these primary crystallites agglomerated into a set of agglomerates each agglomerate having a size D2 > D1, a4 > 0 and either a5 = 0 or a5 > 0.

An object of the present invention is to provide an ammonia separation membrane having a composition different from those of conventional ammonia separation membranes and an ammonia separation method using the ammonia separation membrane. The present invention is an ammonia separation membrane comprising a metal cyanocomplex represented by the following formula (1) and an oxide porous body, wherein a pore shape of the oxide porous body is irregular,         AxM1[M2(CN)w]y·zH2O     (1) where M1 and M2 represent metal atoms such as vanadium, A represents atoms such as hydrogen, x represents a number from 0 to 4, y represents a number from 0.1 to 2, z represents a number from 0 to 6, and w represents a number from 4 to 8.

The present invention belongs to the technical field of compound preparation, and particularly relates to a composite bipolar membrane, a preparation method thereof and an application. The composite bipolar membrane provided by the present invention comprises a cation exchange membrane, a MOF transition membrane and an anion exchange membrane which are stacked in sequence; the cation exchange membrane is formed by a first polymer, and the first polymer is a random copolymer having the structure shown in formula (1); the anion exchange membrane is formed by a second polymer, and the second polymer is a random copolymer having the structure shown in formula (2). Using the composite bipolar membrane provided by the present invention in the production of hexacyanocobaltate by bipolar membrane electrodialysis can continuously and efficiently obtain hexacyanocobaltate, and has broad application prospects.

The present invention pertains to a double metal cyanide complex catalyst in a form of particles, wherein a 50% cumulative volume particle diameter determined from a cumulative volumetric particle size distribution obtained by a laser diffraction scattering method in the double metal cyanide complex catalyst is from 0.01 to 4.0 μm, and a content of the particles having a particle diameter of 11 μm or more with respect to the total volume of the double metal cyanide complex catalyst is 10% by volume or less.

The present invention pertains to a double metal cyanide complex catalyst in a form of particles, wherein a 50% cumulative volume particle diameter determined from a cumulative volumetric particle size distribution obtained by a laser diffraction scattering method in the double metal cyanide complex catalyst is from 0.01 to 4.0 µm, and a content of the particles having a particle diameter of 11 µm or more with respect to the total volume of the double metal cyanide complex catalyst is 10% by volume or less.

Systems and methods of implementation and manufacture of hierarchical systems for use with TMCCC-containing conductive structures (e.g., electrodes), and methods of using and manufacturing such structures and electrochemical cells containing these devices. x M y N z Ti a1 V a2 Cr a3 Mn a4 Fe a5 Co a6 Ni a7 Cu a8 Zinc a9 Ca a10 Mg a11 [R(CN)6] b (H2O) c The method includes combining electrochemically active materials to produce a hierarchical structure, the hierarchical structure having a plurality of primary crystallites having a size D1, the plurality of primary crystallites being aggregated into a collection of agglomerates, each agglomerate having a size D2>D1, a4>0, and either a5=0 or a5>0.

The invention provides an oil-dispersible MHCF nano-particle as well as a preparation method and application of the oil-dispersible MHCF nano-particle. The material is oil-dispersible hexacyanoferrate metal (MHCF) nanoparticles, the molecular formula of the oil-dispersible hexacyanoferrate metal (MHCF) nanoparticles is KM [Fe (CN) 6], and M is one or more of nickel, vanadium, chromium, molybdenum, tungsten, manganese, iron, ruthenium, cobalt, platinum and copper metal elements. The preparation method comprises the following steps: firstly, mixing an aqueous solution of an anionic metal cyano complex containing a metal atom Fe as a central metal with an aqueous solution of metal cations containing a metal atom M, and carrying out coprecipitation to obtain Prussian blue type MHCF nanoparticles; secondly, a solution obtained by dissolving a ligand in a solvent is mixed with the MHCF nano-particles for surface modification, and oil-dispersible NiHCF nano-particles dispersed in the mixed solution are obtained; and finally, carrying out post-treatment on the solution after the reaction, so as to obtain the oil-dispersible MHCF nano-particles.

To provide a method and an apparatus for recovering ammonia in exhaust gas as a solid under more convenient, inexpensive and mild conditions than those under a controlled temperature and pressure.SOLUTION: Ammonia bicarbonate aqueous solution is brought into contact with an ammonia adsorbed PB derivative represented by general formula (1), and after ammonia is desorbed, carbon dioxide is introduced to recover the ammonium carbonate precipitated in the solution as a solid. AxM[M'(CN)6]y.zH2O...(1) [In formula (1), x is 0-3, y is 0.1-1.5, z is 0-6, A is hydrogen, ammonium cation, alkali metal ion, etc., and M, M 'are predetermined cations.]SELECTED DRAWING: Figure 2

The present invention relates to the field of sodium ion battery positive electrode materials, and in particular to a Prussian white positive electrode active material and its preparation method and application. The chemical formula of the Prussian white positive electrode active material is Na x M[T(CN)6] y zH2O, where M is at least one of Mn, Fe, Ni, and Cu, T is one of Mn and Fe, and 1.9 < x ≤ 3, 0 < y ≤ 1, and 0 < z < 1. The Prussian white positive electrode active material of the present invention has a low water content and a high sodium content, significantly improving the rate capability of sodium-ion batteries while ensuring high capacity and excellent cycle performance. The preparation method of the Prussian white positive electrode active material of the present invention is a room-temperature reaction, which is simple to prepare, has a short reaction time, is easily mass-produced, and has promising application prospects. This invention provides a new approach to improving the performance of Prussian white positive electrode materials.

The present invention relates to a facile synthetic method to synthesize novel hexagonal phase CuCo (H—CuCo) PBAs with high crystallinity, as well as extended synthesis of doping PBAs with hexagonal phase: Fe0.1—CuCo, Fe0.2—CuCo, Co0.1—CuCo, Ni0.1—CuCo, and Zn0.1—CuCo. The hexagonal phase H—CuCo PBAs and the doping sequence of PBAs with hexagonal phase exhibit superior crystallinity and significantly higher intrinsic specific surface area. Meanwhile, H—CuCo PBAs show great potential for gas adsorption and have a positive impact on the development of PBAs for other applications.

Embodiments of the present application provide a Prussian blue-like transition metal cyanide, a preparation method therefor, and related positive electrode plate, secondary battery, battery pack and device. The Prussian blue-like transition metal cyanide may comprise secondary particles which comprise a plurality of primary particles, wherein the primary particles may have a spherical or spherical-like morphology.

The invention provides an ammonia chemical species desorption process capable of desorbing ammonia chemical species adsorbed onto a Prussian blue derivative more simply at lower cost under milder conditions as compared with the use of an aqueous solution of a salt or strong acid, and more efficiently as compared with the use of only water. This ammonia chemical species desorption process comprises an ammonia chemical desorption step of bringing carbon dioxide and water into contact with a Prussian blue derivative represented by the following general formula (1), thereby desorbing an ammonia chemical species.         AxM[M' (CN) 6]y·zH2O ···     (1) where x is 0 to 3, y is 0.1 to 1.5, z is 0 to 6, A is at least one cation of hydrogen, ammonium, an alkaline metal, and an alkaline earth metal, and M and M' are each independently at least one cation of at least one of atoms having atomic numbers 3 to 83 except for ammonium, an alkali metal, and an alkaline earth metal.

The application discloses a kind of post-processing methods of prussian blue positive material and application, it is related to battery material technical field.The post-processing method of the application mixes water-resistant dispersant solution with mass concentration of 0.1%-5% with prussian blue matrix containing water, and the prussian blue dispersion slurry with solid content of 10%-50% is prepared;The prussian blue positive material is prepared after the slurry is filtered and dried.The post-processing method is less changed to the existing process route, and the input cost is low;It utilizes water-resistant dispersant to modify the surface of prussian blue, significantly reduces the resorption rate and resorption amount of prussian blue to moisture in high dew point environment, while the electrical performance is not affected;The prussian blue positive material prepared has good dispersibility, tap density is improved, which is beneficial to subsequent uniform slurry and prepared high compaction electrode, wide applicability, can be used for preparing positive electrode, secondary battery and electric device.

The invention provides a process for removing cyanide from a cyanide-bearing aqueous fluid comprising free cyanide and one or more metal cyanide complexes, the process comprising: (i) contacting the cyanide-bearing aqueous fluid with an anion- exchange absorbent to absorb the one or more metal cyanide complexes, thereby producing a metal-lean aqueous fluid comprising free cyanide; (ii) acidifying at least one of the cyanide-bearing aqueous fluid and the metal-lean aqueous fluid to speciate the free cyanide as HCN; and (iii) removing HCN from the metal-lean aqueous fluid to produce a cyanide-lean aqueous fluid.

The invention provides a potassium ion / metal battery high-entropy negative enthalpy Prussian blue analogue positive electrode material and a preparation method thereof, the material also comprises ions of at least five different metal elements in addition to potassium ions, and the preparation method comprises the following steps: synthesizing the material by using a cyanide complex with the chemical formula of Kx [M '(CN) 6], potassium salt and salts of various metals as raw materials and adopting a coprecipitation method. On the basis of the design of the high-entropy component, the disorder of an N coordination environment can be remarkably improved, and then generation of anion defects is inhibited; the high-entropy negative enthalpy structure can significantly enhance the structural stability of the material, and further inhibits complex phase state transition caused by Jahn-Teller lattice distortion, Fouli repulsion, d-pi orbit overlapping and coulomb gravitation change. The regulated electronic structure can eliminate band gaps and reduce potassium ion diffusion barriers, so that the electrochemical dynamic behavior is enhanced; the high element compatibility in the high-entropy component can significantly weaken the accumulation of lattice stress in long-term circulation so as to enhance the electrode stability. Therefore, the prepared series of high-entropy negative-enthalpy electrode materials have high reversible specific capacity, high working voltage and excellent rate capability and cycling stability.

The present invention provides a composite cathode material, a preparation method thereof and an application. The preparation method includes: mixing a phosphorus source, a lithium source and Li x M y N z and calcining to obtain the composite cathode material; wherein, 0 ≤ x < 2, 0.8 ≤ y ≤ 2, 0.5 < z < 0.8; M is a metal ion, N is a ligand ion containing a cyanide ion, and the mixture formed after mixing is acidic. In the present invention, the phosphorus source, the lithium source and L ix M y N z are mixed and calcined. The carbide decomposed by L ix M y N z reacts with the phosphorus source to generate elemental carbon, thereby realizing the atomic-level mixing of M element, C element and Li element, and thus forming a carbon-coated composite cathode material. The process of the present invention is simple, can achieve uniform carbon coating and form a conductive network inside the particles, and effectively improves the electrochemical performance of the composite cathode material.

The present invention provides a Prussian blue positive electrode material and a preparation method thereof, and a battery. The Prussian blue positive electrode material includes a core material and a coating layer coated on at least part of the surface of the core material: the coating layer includes one or more of polysiloxane, ethyl silicone oil, methylphenyl silicone oil, wax-containing silicone oil, cyanide-containing silicone oil, and phosphate surfactants; wherein the Prussian blue positive electrode material has a single crystal morphology, and the mass ratio of the coating layer to the core material is (0.005-0.05): 1. The present invention increases the contact angle between the material and water and reduces the moisture adsorption on the surface of the material by adding a hydrophobic coating layer; at the same time, the coating layer interrupts the conversion process of surface adsorbed water to internal crystallized water, so that the Prussian blue composite material not only has a low water content, but also can prevent it from secondary water absorption during use, so that it reaches a moisture growth value of no more than 600ppm after being exposed to water absorption for 72 hours at a dew point of -20°C.

The invention discloses a preparation method and application of a Prussian blue nanocage / calcium chloride composite hygroscopic material. The preparation method comprises the following steps: step 1): preparing nickel-cobalt Prussian blue nanocubes; 2) preparing nickel-cobalt Prussian blue nanocages; 3) preparing a Prussian blue nanocage / calcium chloride composite hygroscopic material. The Prussian blue nanocage / calcium chloride composite hygroscopic material has excellent hygroscopic, electric heating, photothermal energy storage and other properties, and can be used for preparing hygroscopic warmth preservation, intelligent response, hygroscopic heat storage, and hygroscopic refrigeration.

The present invention relates to a simple synthesis method for the synthesis of a novel hexagonal phase CuCo (H-CuCo) Prussian blue analogue (PBA) having a high degree of crystallinity, and to the extended synthesis of the following doped PBA having a hexagonal phase: Fe < 0.1 >-Cu < Co >, Fe < 0.2 >-Cu < Co >, Co < 0.1 >-Cu < Co >, Ni < 0.1 >-Cu < Co >, and Zn < 0.1 >-Cu < Co >. The hexagonal phase H-CuCo PBA and the doped PBA having the hexagonal phase exhibit superior crystallinity and a higher intrinsic specific surface area. Meanwhile, H-CuCo PBA shows greater gas adsorption potential, and has a positive influence on the development of PBA for other applications.

The invention belongs to the technical field of preparation of potassium aurous cyanide, and particularly relates to a method and equipment for directly synthesizing potassium aurous cyanide, when the concentration of a potassium cyanide solution is 1.5-2.5 mol / L, the concentration of a potassium hydroxide solution is 2-3 mol / L, the reaction temperature is 50-80 DEG C, and the gold potential is kept within the range of-400 mV to-800 mV, the concentration of the potassium aurous cyanide solution is relatively high, and the potassium aurous cyanide solution can be directly synthesized. The reaction speed is high, during electrolytic reaction, continuous electrolysis is carried out by controlling the temperature to be 60-65 DEG C, the voltage to be 6-7 V and the current density to be 100-200 A / m < 2 >, the concentration of a potassium aurous cyanide solution is larger, the design of reaction condition parameters is better and is closer to a saturated state, and the reaction time needs to be set to be longer than 1 h in actual processing production; and gold powder is used for replacing gold flakes for reaction, so that the reaction time can be shortened, and the working efficiency is improved.

The invention belongs to the technical field of gold plating, and particularly relates to a preparation process of potassium aurous cyanide, which comprises the following steps: analyzing whether the temperature change is synchronous with the gold element consumption rate change or not by monitoring the temperature change and the gold element consumption rate change in different time intervals and different areas in a period; the method is beneficial for analyzing influence factors of gold element consumption rate change to obtain whether the gold element consumption rate change is related to temperature change or not, is beneficial for avoiding gold element consumption rate abnormity caused by reaction temperature change, and avoids waste of raw materials and increase of energy consumption by regulating and controlling the influence factors and controlling the reaction rate. Untoward effects such as the utilization rate of raw materials are reduced, loss is reduced, and the economic effect of production is improved; the occurrence of side reaction is favorably reduced, and the purity of the potassium aurous cyanide is improved.

A desalination cell including an electrode including a material having at least one compound of the following formula: AxMIyMIIz(CN)6, where A is Na, Li or K, 0 ≤ x ≤ 2, MI is a first metal, MII is a second metal, 1 ≤ y, and z ≤ 2. The material is configured to reduce calcium carbonate formation and / or carbon dioxide gas formation during operation of the desalination cell. The first metal may be Fe, Mn, Co, Sc, Ti, Cr or Zn. The second metal is Fe, Mn, Co, Sc, Ti, Cr or Zn. The first metal may be different than the second metal.

The invention discloses a nickel-cobalt Prussian blue-ZnIn2S4 core-shell photocatalyst as well as a preparation method and application thereof. According to the catalyst material, a nickel-cobalt Prussian blue analogue is used as an inner core, and is coated with a nanoflower-shaped ZnIn2S4 shell, so that a photocatalytic composite material with an S-shaped heterojunction structure is formed; the preparation method of the photocatalyst is simple, and the photocatalyst can be prepared through a low-temperature hydrothermal method; according to the catalyst, [Co (CN) 6] < 3-> defect regulation and a localized surface plasmon resonance effect are combined, an S-type heterojunction is constructed, an electronic structure is optimized, carrier migration is enhanced, the light absorption range is widened, and meanwhile the photo-thermal effect is utilized, so that the photocatalytic efficiency is remarkably improved; under the condition of simulating sunlight irradiation, the highest catalytic hydrogen production activity of the nickel-cobalt Prussian blue-ZnIn2S4 photocatalyst can reach 38.3 mmol h <-1 > g <-1 >, meanwhile, excellent stability is kept, and a new technical direction is provided for development of efficient photocatalytic hydrogen production materials.

The invention discloses a high-manganese Prussian white material as well as a preparation method and application thereof. Mn in the high-manganese Prussian white material has + 2 valence and + 1 valence at the same time; the chemical formula of the Na-2x-yAx [By (CN) 6]. ZH2O is as follows: Na6-2x-yAx [By (CN) 6]. A is Mn < 2 + >, and x is the atom number of A in the chemical formula; b is Mn < + >, and y is the atom number of B in the chemical formula; z is the atomic number of H2O in the chemical formula; 0.5 < = x + y < = 3, 0 < x < = 1. The + 2 valence Mn in the Prussian white material is partially replaced by + 1 valence Mn, the manganese content is increased compared with that of conventional Prussian white, the number of active sodium sites of the Prussian white material is increased, and then the specific capacity and energy density of the electrode material are improved; the moderate increase of the manganese content is beneficial to improving the crystallization integrity and keeping the stability of the material structure and the electrochemical performance; the problems that in the prior art, a high-manganese Prussian white material is low in specific capacity and energy density and poor in stability are solved.