124 results about "Sodium ferrocyanide" patented technology

The invention discloses a prussian-blue type sodium ion battery positive electrode material and a preparation method therefor. According to the material, iron ions in iron-nitrogen octahedron in prussian-blue crystal lattices are substituted by transitional metal elements from the interiors to the surfaces of crystal particles based on concentration gradient; the molecular formula of the positive electrode material is Na<x>M<y>Fe<1-y>[Fe(CN)<6>]<z>.nH<2>O, wherein M is a substituting element. The preparation method comprises the following steps of dissolving sodium ferrocyanide, ferrous chloride, and a mixture of substituting element chloride and ferrous chloride into deionized water separately to obtain each precursor solution; then performing a co-precipitation reaction to obtain a prussian-blue turbid liquid, wherein the substituting element is distributed from the interiors to the surfaces of the crystal particles based on concentration gradient; and performing centrifuging, washing and vacuum drying to prepare the positive electrode material. The positive electrode material has the characteristics of high capacity, high cycling stability, simple preparation and the like.

The invention relates to a Prussian blue analogous positive material for sodium-ion batteries and a preparation method of the positive material and belongs to the technical field of sodium-ion batteries. The chemical composition of the positive material is Na2Ni0.4Co0.6Fe(CN)6. The preparation method of the positive material comprises the following steps: respectively dissolving nickel salt, cobalt salt and sodium ferrocyanide in water to prepare a nickel salt solution, a cobalt salt solution and a mother solution which are same in concentration; simultaneously adding the nickel salt solution and the cobalt salt solution into the mother solution, subsequently stirring in dark places at room temperature; then ageing at the room temperature; subsequently centrifuging and carrying out solid-liquid separation, firstly washing while centrifuging, subsequently washing by using absolute ethyl alcohol, and finally drying to prepare the positive material. The positive material has a plurality of characteristics of high capacity, high cycling stability and high coulombic efficiency and serves as novel low-cost and environmentally-friendly energy storage positive material for the sodium-ion batteries; the raw materials used by the method are widely distributed in the nature, are low in cost and are environmentally-friendly; the method is simple and is liable to control; the prepared positive material is stable in performance.

The invention discloses a Prussia white composite material and a preparation method and application thereof. The Prussia white composite material comprises the following steps of: (1) mixing sodium ferrocyanide or a hydrate thereof with deionized water to obtain solution A with concentration of 0.1 to 0.5mol/L; (2) mixing soluble salt containing divalent Mn2+ with deionized water, then adding fluoridized carbon nano-tubes, and by sufficiently dispersing, obtaining solution B, wherein concentration of Mn2+ in the solution B is 0.2 to 1.0mol/L; and (3) dropwise adding the solution B obtained inthe step (2) into the solution A obtained in the step (1), and by a hydrothermal reaction and post processing, obtaining the Prussia white composite material. According to the Prussia white compositematerial prepared by the method, the composite material is applied in a sodium-ion battery. The preparation method disclosed by the invention has the advantages of simple process, low cost, short period, low energy consumption, suitability for industrial production and the like.

The invention discloses a mineral dressing additive for a gold mine, which is prepared by taking inorganic substances as raw materials, and reacting at high temperature of 600-950 DEG C for 1-3 hours and pulverizing. The mineral dressing additive for a gold mine comprises the following components in parts by weight: 20-50 parts of urea, 5-10 parts of sodium hexametaphosphate, 5-10 parts of sodium sulfide, 0-10 parts of sodium bromide, 0-30 parts of sodium ferrocyanide, 20-50 parts of soda and 5-10 parts of sodium hydroxide. The product is free of virulent compounds, can not injure human and animals during production and use, can not cause significant pollution, and is environment-friendly. Proven by industrial trial, the product has the advantages of better mineral dressing effect, high recovery rate, simple production method, short process flow, easy technological operation, abundant and cheap raw materials for production, low production cost and better economic benefit and social benefit.

The invention relates to a preparation method of a low-toxic environment-friendly type novel precious metal beneficiation agent. Raw materials of the low-toxic environment-friendly type novel precious metal beneficiation agent comprise a cyanate, sodium hydroxide, sodium sulfate, sodium ferrocyanide, a bromide, and a lead salt. The preparation method comprises following steps: sodium cyanate, sodium hydroxide, sodium sulfate, and sodium ferrocyanide are mixed at a certain ratio; an obtained mixture is delivered into a smelting pot which is heated to be slightly red, and is heated to 650 to 750 DEG C so as to obtain a fused material, temperature is maintained to be 750 DEG C for 30 to 50min of reaction, and then an obtained product is collected and cooled; the obtained product is smashed, the bromide and the lead salt are added for stirring, and the environment-friendly type precious metal beneficiation agent is obtained via combination. The environment-friendly type precious metal beneficiation agent can be widely used for precious metal beneficiation metallurgy of nonferrous metals ores, contains no hypertoxic compounds, is safe for human and animal, and is friendly to the environment. Compared with other metal beneficiation agents, the environment-friendly type precious metal beneficiation agent is excellent in effects, stable in performance, and low in production cost; the preparation method is simple; and environmental protection can be realized.

The invention relates to a preparation method of a Prussian blue flower-like nano-structure electrode material. The preparation method comprises the following steps: 1) firstly, dissolving nickel chloride hexahydrate and anhydrous sodium citrate into de-ionized water; 2) dissolving sodium ferrocyanide decahydrate into de-ionized water; 3) pouring a solution of step 2) into a mixed solution obtained by step 1) and uniformly stirring to obtain a mixed solution; 4) standing the mixed solution obtained by step 3); 5) centrifuging and collecting sediment; washing the sediment for several times; drying in vacuum to obtain Prussian blue precursor powder; 6) adding the precursor powder into a sodium hydroxide solution and carrying out ultrasonic treatment; 7) centrifuging and collecting a product and washing; drying in vacuum to obtain light green powder, namely the Prussian blue flower-like nano-structure electrode material. The preparation method provided by the invention has the beneficial effects that the specific surface area is remarkably enlarged so that reaction sites of electrolyte and the electrode material are effectively increased and an ion diffusion distance is reduced; when the Prussian blue flower-like nano-structure electrode material is used as a positive electrode active material of a sodium ion battery, the material has the characteristics of high power and good cycling stability.

The invention relates to a preparation method of a graphite/Prussian blue composite material. The preparation method comprising that ferrous chloride and sodium ferrocyanide undergo a hydrothermal reaction in an aqueous solution of a surfactant based on a coprecipitation method to produce Prussian blue nanospheres, the Prussian blue nanospheres and graphite oxide are stirred, and the solution is quenched by liquid nitrogen, then is freeze-dried and finally is reduced through hydrazine hydrate. The invention discloses a use of the graphite/Prussian blue composite material as a sodium ion battery positive electrode material. The Prussian blue nanospheres have excellent electrochemical performances. Graphene roll coating further increases the conductivity of the Prussian blue nanospheres and improves the long cycle performance of the Prussian blue nanospheres. The capacity of a sodium ion battery positive electrode prepared from the graphite/Prussian blue composite material is not easy to decay, the magnification performance is good, and after cycle 500 times under current density of 150mAhg<-1>, the capacity is about 110mAhg<-1> and a capacity retention rate is 90.2%.

The invention provides a gold extracting agent and a preparation method thereof, and belongs to the technical field of gold extraction. The gold extracting agent comprises the raw material components in parts by weight: 12-12.4 parts of sodium hexametaphosphate, 7-7.4 parts of sodium cyanate, 9.4-9.8 parts of sodium ferrocyanide, 10.3-10.7 of sodium sulfide, 13.3-13.7 parts of sulphur, 10.4-10.8 parts of sodium bromide, 6.3-6.7 parts of sodium chloride, 8.2-8.6 parts of manganese dioxide, 11.8-12.2 parts of urea, and 9.3-9.7 parts of industrial sodium carbonate. The gold extracting agent is alkaline, and has the advantages of low toxicity, environmental protection, short leaching time and convenient transportation and keeping and the like; in addition, the gold extracting rate is high; and the gold extracting agent is quite suitable for use as a novel gold extracting agent for heap leaching, pond leaching and carbon paste production processes of micro-fine particle gold-containing oxidized ores.

The invention provides a preparation method of a prussian blue type energy storage material, and specifically relates to a preparation method of a prussian blue type sodium-ion battery electrode material with high yield. The preparation method comprises the following steps: S1, dissolving divalent transition metal perchlorate and sodium ferrocyanide into water respectively to obtain a divalent transition metal perchlorate solution and a sodium ferrocyanide solution; S2, dissolving sodium perchlorate into water to obtain a sodium perchlorate solution; and S3, mixing the divalent transition metal perchlorate solution and the sodium ferrocyanide solution with the sodium perchlorate solution to obtain a mixed solution, and stirring and standing the mixed solution to obtain a sediment product;and separating and drying the sediment product to obtain the prussian blue type energy storage material. According to the preparation method, a great deal of loss of the prussian blue type material inthe cleaning process is avoided, and high-yield production can be realized. The preparation method is simple and high in yield, and is easy for industrial large-scale production.

The invention relates to a full-biodegradable oil-soluble anti-caking agent for a compound fertilizer and a preparation method and application thereof. The anti-caking agent consists of the following raw materials: a surfactant, an acidifier, vegetable wax, waste oil and fatty acid mixture and more preferentially also comprises a nonionic surfactant and/or sodium ferrocyanide. In the invention, the prepared anti-caking agent can be completely bio-degraded in natural environment, the preparation technology is relatively simple, the cost performance is relatively high, the caking of a chemical compound fertilizer caused by dampness and extrusion can be effectively prevented, and the anti-caking rate of the most easy-to-cake potassium sulfate compound fertilizer and high-nitrogen compound fertilizer is greater than 96%, preferentially greater than 98% and more preferentially greater than 99% and approaches and even reaches 100%.

The invention discloses a high-rate sodium ion battery preparation method, which comprises: preparing a Prussian blue material by using ferrous chloride and sodium ferrocyanide as raw materials, preparing Prussian blue nanospheres coated with oxidized graphite, and finally reducing with a hydrazine hydrate solution to prepare Prussian blue nanospheres coated with graphite so as to be used as a sodium ion positive electrode material; and peeling molybdenum disulfide by using isopropyl alcohol and N-methylpyrrolidone as a solvent, coating with oxidized graphite, and finally reducing with a hydrazine hydrate solution to obtain a graphite coated molybdenum disulfide nano-sheet material adopted as a sodium ion negative electrode material. According to the present invention, the additional electric conduction agent is not required to be added during the sodium ion battery preparation process so as to save the cost, and the prepared sodium ion battery has advantages of high capacity, good cycle stability, and excellent rate performance.

The invention discloses a Prussian blue material, and a preparation method and an application thereof. The preparation method comprises the steps: mixing sodium ferrocyanide or a hydrate of sodium ferrocyanide with deionized water to obtain a solution I; mixing soluble ferrous salt, ascorbic acid and sodium citrate with deionized water to obtain a solution II; dropwise adding the solution I and the solution II into deionized water at the same time, and carrying out a coprecipitation reaction to obtain a suspension of a Prussian blue material; and aging and post-processing the suspension to obtain the micron-sized Prussian blue material with a cubic stepped structure. The prepared Prussian blue material is applied to a positive electrode of a sodium ion battery, so that the capacity and thecycling stability of the sodium ion battery can be remarkably improved.

The invention discloses a doping modified Prussian blue based material for sodium-ion batteries and a preparation method. The material comprises the following steps: mixing sodium ferrocyanide, sodiumsalt and deionized water to obtain a solution I; mixing soluble salt containing divalent Mn<2+> and deionized water to obtain a solution II; mixing soluble salt containing divalent M<2+> and deionized water to obtain a solution III; alternately dropwise adding the solution II and the solution III to the solution I, performing a co-precipitation reaction and aftertreatment to obtain doping modified Prussian blue based material particles. The doping modified Prussian blue based material can significantly improve capacity and cyclic stability of the sodium-ion batteries when applied to cathodesof the sodium-ion batteries.

The invention provides a special gold dissolving agent for a gold ore. The special gold dissolving agent is prepared by reacting and mixing carbonate or bicarbonate, hydroxide, permanganate, perchlorate, persulphate, ammonium salt, sodium ferrocyanide or potassium ferrocyanide. The gold dissolving agent has the advantages of rapidly dissolving metal gold, selectively leaching gold from various gold ores, being low in toxicity and the like.

The invention discloses a preparation method of a ferrocyanogen positive material. The preparation method specifically comprises the following steps: mixing sodium ferrocyanide with deionized water to obtain a solution A; mixing a soluble salt of divalent transition metal ions M<2+> with deionized water to obtain a solution B, and then adding a precipitator to obtain an M(OH)2 suspension liquid; mixing the solution A and the M(OH)2 suspension liquid, then adding weak avid, and carrying out a hydrothermal reaction to obtain the ferrocyanogen positive material. According to the preparation method of the ferrocyanogen positive material disclosed by the invention, the method can regulate and control the morphology and crystal structure of the target product, the prepared ferrocyanogen positive material has good crystallinity, the material is applied into sodium-ion battery electrodes, and the electrochemical performance of sodium-ion batteries can be obviously improved.

The invention discloses a prussian blue material and a preparation method thereof. The preparation method specifically includes the following steps: mixing sodium ferrocyanide with deionized water toobtain a solution I; mixing divalent manganese salt and deionized water to obtain a solution II; mixing sodium salt and deionized water to obtain a solution III; then simultaneously adding the solution I and the solution II into the solution III, and obtaining the prussian blue based material after co-precipitation. The prussian blue based material disclosed by the invention is applied into anodesof sodium-ion batteries, thereby greatly enlarging the capacity of sodium-ion batteries and remarkably improving the cycling stability.

The invention relates to a composite material of a multi-walled carbon nanotube and a Prussian blue analogue. The preparation method comprises the following steps: adding an aqueous dispersant and themulti-walled carbon nanotube into deionized water to dissolve to obtain a mixed solution;- using potassium ferrocyanide/sodium ferrocyanide, sodium chloride and MnCl2- as precursors for the preparation of Prussian blue analogues, adding potassium ferrocyanide/sodium ferrocyanide into the mixed solution, adding sodium chloride/sodium citrate into the mixed solution to form a saturated solution ofsodium chloride/sodium citrate, dissolving MnCl2 in deionized water, and dropwise adding the saturated solution to form a suspension; collecting and drying solid materials in the suspension- to obtainthe composite of multi-walled carbon nanotubes and Prussian blue analogues. The composite of MWNTs and Prussian blue analogues was applied to the cathode of sodium ion battery.

The invention relates to a Prussian blue sodium ion battery positive electrode material and a preparation method thereof. The method comprises the following steps: dissolving transition metal salt and tartaric acid in deionized water to form a solution A, dissolving sodium ferrocyanide decahydrate and ascorbic acid in deionized water to form a solution B, and dissolving polyvinylpyrrolidone and sodium chloride in deionized water to form a solution C; simultaneously adding the solution A and the solution B into the solution C through a peristaltic pump, and performing stirring while heating in an N2 atmosphere until the solution becomes a suspension liquid after dropwise adding is completed; keeping heating and stirring the suspension for 12 hours, finally aging at room temperature for 24 hours, then centrifugally washing with deionized water and absolute ethyl alcohol for three times respectively, and finally drying in vacuum at 120 DEG C for 24 hours to obtain the Prussian blue positive electrode material.

The invention relates to a preparation method of a three-dimensional graphene network structure supported Prussian blue analog material, The preparation method comprises the following steps: dissolving a carbon source, a nitrogen source and NaCl in deionized water, and performing vacuum drying at 50 DEG C in a freeze dryer to obtain a mixture; grinding the mixture into a powder, spreading the powder in an ark, and placing the ark in a constant temperature zone of a tube furnace for calcination; obtaining a three-dimensional graphene network structure material, dissolving the three-dimensionalgraphene network material in deionized water, and stirring uniformly to obtain a mixed solution; adding potassium ferrocyanide/ sodium ferrocyanide to the mixed solution, adding sodium chloride/ sodium citrate to the mixed solution to form a saturated solution of sodium chloride/ sodium citrate, and adding MnCl2 dropwise to form a suspension; and obtaining the three-dimensional graphene network structure supported Prussian blue analog material. The prepared composite material is applied to anodes of sodium ion batteries.

The invention relates to a sodium-rich anhydrous prussian blue analogue material. The preparation method comprises the following steps: using potassium ferrocyanide or sodium ferrocyanide, sodium chloride and manganese chloride as precursors for preparing a prussian blue analogue, so that a turbid liquid is formed; collecting solid materials in the turbid liquid by using a centrifugation and suction filtration method, and carrying out water washing until no residual sodium chloride exists in the product, so that a sodium-rich prussian blue analogue is obtained; grinding the prepared sodium-rich prussian blue analogue into powder, laying the powder in a square boat, and placing the square boat in a constant-temperature zone of a tubular furnace for calcining; and taking one or a mixture ofmore selected from N2, He an Ar as an inert gas source, heating the tubular furnace to 180 DEG C at a heating speed of 1-10 DEG C/min, carrying out heat preservation for 2-3 hours to remove interstitial water, and carrying out cooling to room temperature along with the furnace after the heat preservation is finished, so that the sodium-rich anhydrous prussian blue analogue material is obtained. The prepared composite material of prussian blue analogue is applied to positive poles of sodium-ion batteries.

The invention discloses an electro-nickelling working solution for a PET (polyethylene glycol terephthalate) substrate based FPC (flexible printed circuit) board; the electro-nickelling working solution comprises the following components in percentage by weight: 0.01-10% of anti-stripping agent, 0.1-50% of buffer agent boric acid, 0.1-50% of dissolving-assistant wetting agent, and the balance of purified water, wherein the anti-stripping agent is a mixture of sodium benzimidazole derivative and sodium ferrocyanide with a weight ratio of (0.5-2):1, the dissolving-assistant wetting agent is one or two selected from methanol, ethanol, isopropanol, acetone, N, N-dimethylformamide, glycol ether and ethylene glycol. The PET substrate based tough copper-clad plate processed according to the invention can effectively ensure that releasing and stripping are unlikely to occur between the PET substrate and the copper foil after a nickelling treatment. The yield of the PET substrate based FPC board electro-nickelling technique can be greatly improved, so that the electro-nickelling treatment to PET substrate based FPC boards for large quantities becomes possible.

The invention discloses a preparation method of a manganese-based Prussian white positive electrode material, which comprises the following steps: 1) dissolving a manganese salt containing divalent manganese ions in deionized water to form a solution A; 2) dissolving sodium ferrocyanide in deionized water to form a solution B; (3) dropwise adding the solution A into the solution B, and carrying out a co-precipitation reaction to obtain a suspension solution; and 4) transferring the suspension solution obtained in the step 3) into a reaction kettle, adding a soluble sodium salt, carrying out ahydrothermal reaction for a certain time, and carrying out suction filtration, drying and precipitation to obtain the manganese Prussian white positive electrode material. According to the preparationmethod disclosed by the invention, the morphology and size distribution of the product can be regulated and controlled, and the prepared manganese-based Prussian white has good crystallinity, is applied to electrodes of sodium ion batteries, and can significantly improve the electrochemical performance of the sodium ion batteries, especially can effectively improve the charge-discharge capacity.