41 results about "Cobalt Sulfate Heptahydrate" patented technology

The invention discloses a nickel sulfate hexahydrate crystal and cobalt sulfate heptahydrate crystal continuous-crystallizing process which comprises the following steps: firstly carrying out MVR evaporation concentration on a high-purity solution produced through an extraction procedure to 30%-39%, and secondly continuously cooling and crystallizing through an improved cooling type internal-circulating continuous crystallizer; continuously discharging crystal slurry from the bottom of the crystallizer for centrifugal solid-liquid separation; and continuously drying a crystal product at low temperature to produce product crystals with large granularity and uniform size distribution, and recovering a mother solution to an evaporation process. Compared with the traditional periodic crystallization process, the nickel sulfate hexahydrate crystal and cobalt sulfate heptahydrate crystal continuous-crystallizing process disclosed by the invention has the advantages of low evaporation energy consumption, fewer crystallization control process parameters, stability in operation, high automation degree, high production efficiency and the like and is easy to control, and operators are reduced.

This invention relates to a cobalt aluminum hydrotalcite/fluorinated graphene composite material, and a preparation method thereof. The composite material is prepared by the steps of: 1) preparing graphite oxide powder by a Hummers method; 2) dispersing the graphite oxide powder in deionized water; stripping by an ultrasonic cell crusher; centrifuging by a centrifuge; obtaining supernatant liquor; adding hydrofluoric acid solution in the supernatant liquor to stir and react; putting the solution into a high-pressure reactor to perform constant-temperature fluoridation; cooling to room temperature; filtering and washing till the solution is neutral, so as to obtain the fluorinated graphene; 3) dispersing the fluorinated graphene in ethanol solution; stripping by the ultrasonic cell crusher to obtain fluorinated graphene suspension; 4) adding cobalt sulfate heptahydrate, aluminum chloride hexahydrate and urea into the fluorinated graphene suspension to stir and react; putting the solution into the high-pressure reactor to perform hydrothermal reaction; then cooling to the room temperature; and obtaining the cobalt aluminum hydrotalcite/fluorinated graphene composite material after post-processing.

A preparation method for a steel strip covered by a nickel-iron/nickel-cobalt double coating, comprising the following steps: Step 1: mixing sodium carbonate, sodium phosphate dodecahydrate, sodium silicate and sodium hydroxide, and placing the steel strip in the first mixture , the steel strip is soaked in sulfuric acid to activate and remove impurities; step 2: nickel sulfate hexahydrate, nickel chloride hexahydrate, boric acid, and sodium lauryl sulfate are mixed, and the steel strip body is placed in the second mixture for the first electroplating; Step 3: heat-treat the steel strip with the nickel-plated layer, mix sodium hydroxide, sodium carbonate, sodium phosphate dodecahydrate and sodium silicate, soak the steel strip with the nickel-plated layer in the third mixture, wash with water and perform cathodic activation process Removing the oxide film of the steel strip with the nickel-plated layer; step 4: mixing cobalt sulfate heptahydrate, nickel sulfate hexahydrate, sodium citrate dihydrate, boric acid, sodium dodecylsulfonate, sodium saccharin and butynediol , the steel strip substrate with the nickel-plated layer is put into the fourth mixture for the second electroplating, and is successively washed and dried.

The invention discloses a preparation method for cobalt-manganese-nickel oxides. The preparation method comprises steps of separately dissolving industrial products including manganese sulfate monohydrate, cobaltous sulfate heptahydrate and nickel sulfate hexahydrate by hot water, gradually adding a NH4HCO3 solution for performing a neutralization reaction and a precipitation reaction, then continuing to add a KOH solution to react, discharging, filtering, washing by water until SO42-ions disappear, drying, roasting by a high-temperature furnace at the temperature of 820 DEG C for 2-3 hours, ball milling and smashing, stirring and washing by hot water, then filtering, washing, drying and smashing to obtain the cobalt-manganese-nickel oxides. The preparation method is simple, easy to operate, and low in production cost; and the prepared cobalt-manganese-nickel oxides are excellent in product uniformity, stability and electric property, and low in production cost, and can be used for industrial production.

The invention provides a colorful trivalent chromium passivation liquid. A plurality of raw materials are dissolved in deionized water to form the passivation liquid. The passivation liquid comprises the following components by a ratio: 5-9 g/L chromium sulfate hexahydrate, 2-4 g / L cobalt sulfate heptahydrate, 4-8 g / L sodium chlorate, 2-3 g / L ammonium fluoride, 1-2 g / L of nitric acid, 2-3 g / L citric acid, and the balance of water. The resulting passive film has good corrosion resistance, the time can be up to 120 hours or more in a salt spray test, the surface has no any white rust or white spots, the porosity is low, and a blocking agent does not need to be used for treating.

The invention discloses a surface treatment solution for bicycle common carbon steel and a preparation method of the surface treatment solution, belonging to the technical field of chemical descaling. The treatment solution comprises citric acid, oxalic acid, tartaric acid, coconut fatty acid diethanol amide, alkylphenol polyoxyethylene ether, sodium fatty alcohol ether sulfate, ammonium thiocyanate, 2-thiol benzothiazole, cobaltous sulfate heptahydrate, hydrochloric acid and de-ionized water. The finished treatment solution is obtained by mixing and uniformly stirring the various components. The treatment solution, as a cleaning agent, is good in descaling effect, strong in detergency, convenient to use, environment-friendly, high in biodegradation rate, green and environmental protecting; in addition, the treatment solution is quite low in corrosion rate on equipment.

The invention relates to the technical field of preparation of new-energy electrode materials, in particular to an antimony cobalt sulfide-carbon composite nanorod and a preparation method and application thereof. The preparation method comprises the following steps: (1) dissolving antimony chloride, a chelating agent and a sulfur source in a reaction solution in proportion, conducting stirring for uniform mixing, then transferring the formed mixture to a high-pressure reaction kettle lining for a reaction, and after the reaction is finished, centrifuging, washing and drying a product to obtain an antimony sulfide nanorod; and (2) adding the obtained antimony sulfide nanorod serving as a precursor, cobalt nitrate hexahydrate and cobalt sulfate heptahydrate serving as cobalt sources, a sulfur source and a carbon source into a reaction solution together, carrying out uniform stirring, then transferring the obtained mixture to the high-pressure reaction kettle lining for a reaction, and after the reaction is finished, centrifuging, washing, drying and calcining a product, and washing and drying the calcined product to obtain the target product. According to the invention, a method of combining solvothermal synthesis with high-temperature calcination is adopted to prepare a multi-stage layered structure electrode material composed of antimony cobalt sulfide nanorods; and the cycle performance and the rate capability of the electrode material are improved through carbon coating.

The invention discloses a copper foil surface chemical passivation treatment method. By sending the copper foil into a passivation tank containing a zinc-cobalt electroless plating solution with deionized water as a basic solvent, the surface chemical replacement treatment is carried out. The reduction reaction produces metal deposition on the copper foil surface; the zinc-cobalt-containing electroless plating solution contains sodium phosphate 8-20g/L, glucose 2-10g/L, zinc oxide 2-12g/L and cobalt sulfate heptahydrate 2- 8g/L. The invention has the characteristics of reducing energy consumption, reducing pollutant discharge and good passivation effect.

The invention provides a method for efficiently removing nitrate radical impurities in a cobalt sulfate solution. The method comprises the steps of firstly, adjusting the pH value of a crude cobalt sulfate solution to be lower than or equal to 2.5 with dilute sulphuric acid; then adding a formaldehyde solution with the concentration being 40% and the mass of nitrate radicals being 0.4-0.5 time to the cobalt sulfate solution; conducting a reaction at the temperature of 75-85 DEG C; then removing formaldehyde left by the reaction with hydrogen peroxide with the concentration being 30% and the formaldehyde amount being 1.4-1.5 times; then conducting filtration, concentration, cooling and crystallization, so that high-purity cobalt sulfate heptahydrate is obtained. The impurity removal method is easy and convenient to operate, short in production procedure, mild in technological condition and easy to control; no other impurity is generated in the reaction process except a target product, gas and water; the nitrate radical impurities can be effectively removed; the content of the nitrate radical impurities in an obtained cobalt sulfate hexahydrate product can reach 0.02% or below; the method meets the using requirements of such industries as electronic information, batteries, catalysis and analytical tests.

The invention discloses a preparation method of a copper-cobalt-based catalyst for preparing low-carbon alcohols from synthesis gas. The preparation method comprises the following specific steps: step1, treating carbon nanotubes in concentrated nitric acid, coating carbon paper with the treated carbon nanotubes by evaporation, and naturally airing to obtain a cathode electrode material; 2, addinganhydrous cupric sulfate, cobalt sulfate heptahydrate, sodium citrate and sodium sulfate into ionized water, uniformly stirring to obtain a solution a, adjusting the pH value, and putting the solution into a constant-temperature water bath kettle to obtain an electrolyte; 3, putting the cathode electrode material and an anode electrode material into an electrolyte, connecting the cathode electrode material and the anode electrode material by adopting a numerical control constant-current electroplating power supply, and carrying out electrolysis to obtain a copper-cobalt-based catalyst sample;and 4, washing the copper-cobalt-based catalyst sample into a container, drying, roasting, tabletting, grinding and screening to obtain the copper-cobalt-based catalyst. The prepared catalyst is loose and porous in surface, large in specific surface area, highly dispersed in active components and good in catalytic effect.

The invention provides a passivation solution which is prepared by dissolving various raw materials in deionized water. The materials comprise 6-9 g/L of chromium sulfate hexahydrate, 2-4 g/L of cobalt sulfate heptahydrate, 4-8 g/L of sodium chlorate, 2-3 g/L of ammonium fluoride, 1-2 g/L of sulfuric acid, 2-3 g/L of citric acid and the balance water. According to an obtained passivation film, the corrosion resisting property is good, a salt spray test can be kept for 120 h or longer, the workpiece surface has no white rust or white spot, the porosity is low, and no sealing agent is needed for treatment.

The invention discloses a preparation method of a hydrated mesoporous silica coated nano iron-cobalt bimetallic composite material. The preparation method comprises the following steps: 1, adding 0.496 g of ferric sulfate heptahydrate and 0.502 g of cobalt sulfate heptahydrate into a mixed solution of ethanol and water, and mechanically stirring until solid particles are dissolved; 2, dropwise adding a NaBH4 solution into the mixed solution at a speed of 1.5 ml/min, and continuously stirring for 30 minutes to obtain a nano zero-valent iron-cobalt bimetallic suspension; 3, continuing to add ammonia water and hexadecyl trimethyl ammonium bromide into the suspension, continuously stirring for 30 minutes, adding 1ml of tetraethyl orthosilicate, and stirring for 4 hours at a low speed (300rpm);and 4, separating a solid from a liquid by using a magnet, sequentially washing with deionized water and absolute ethyl alcohol for three times respectively, and finally drying in a drying oven for 12 hours, and obtaining a final product, namely the hydrated mesoporous silica coated nano iron-cobalt bimetallic composite material. Through the action of the hydrated mesoporous silica coated nano iron-cobalt bimetal, the problems that the nano iron-cobalt bimetal is easy to agglomerate and inactivate and Co ions are easy to leach are solved, and the dispersity and reactivity of the nano iron-cobalt bimetal are improved. The hydrated mesoporous silica coated nano iron-cobalt bimetallic composite material obtained by the method and hydrogen peroxide form a Fenton-like system which is used forremoving tetrabromobisphenol A in underground water. The method has a very strong remediation effect on the soil and underground water of the tetrabromobisphenol A contaminated site.

The embodiment of the invention discloses a preparation method of a copper-cobalt oxygen evolution catalyst. The preparation method comprises the steps of: dissolving cobalt sulfate heptahydrate with the concentration of 40-100g/L and anhydrous cupric sulfate with the concentration of 20-60g/L into water to prepare a precursor body solution; dropwise adding a potassium hydroxide solution with the concentration of 1-6 mol/L into the solution while stirring the solution, adjusting the pH value of the solution to 8.5-12, controlling the reaction temperature of the solution to be 20-60 DEG C and the reaction time to be 2-6 hours, and standing the solution for 6-16 hours after the reaction is completed; vacuum-filtering and washing the solution, washing the obtained filter cake with water, and drying the filter cake in a drying oven with the drying temperature set to be 60-120 DEG C and the drying time set to be 6-15 hours to obtain a precursor material; grinding the precursor material into powder, and sintering the powder in a sintering furnace under the sintering conditions that the heating rate is 2-5 DEG C/min, the sintering temperature is 300-450 DEG C and the sintering time is 2-5 hours; and after sintering, cooling to room temperature to obtain the copper-cobalt oxygen evolution catalyst with high activity, high stability and low cost.