362 results about "Nickel hydroxide (II)" patented technology

A method for recovering nickel from an sulfuric acid aqueous solution, for recovering nickel in an effectively utilizable form as a raw material of nickel industry material, by separating efficiently impurity elements of iron, aluminum, manganese and the like, from the sulfuric acid aqueous solution containing nickel and cobalt, and the impurity elements, iron, aluminum, manganese and the like.

The method is characterized by comprising the following steps (1) to (5).

• • step (1): to subject the sulfuric acid aqueous solution to oxidation neutralization treatment.
  • step (2): then, to subject the solution to neutralization treatment, and to separate and recover mixed hydroxides containing nickel and cobalt.
  • step (3): to subject the mixed hydroxides to dissolution treatment in a sulfuric acid solution having a concentration of equal to or higher than 50% by mass.
  • step (4): to subject the concentrated solution to solvent extraction treatment, using a phosphate ester-based acidic extraction agent.
  • step (5): by adding a neutralizing agent to the resultant extraction residual liquid, to subject the solution to the neutralization treatment, and to separate and recover nickel hydroxide generated.

The invention relates to a nickel disulfide carbon nano composite material and a preparation method and an application thereof, wherein the composite material is formed by coating a nickel disulfide nanosheet with a carbon layer. The preparation method comprises the following steps of preparing a nickel hydroxide nanosheet precursor by a hydrothermal method, performing magnetic stirring and dispersing in deionized water to obtain a uniform dispersion liquid of the nickel hydroxide nanosheet precursor, adding a buffering agent tris(hydroxymethyl) aminomethane hydrochloride, and adjusting the pHvalue to be 8.5 by adopting an alkali solution with the pH value of 13, adding dopamine hydrochloride, and magnetically stirring at room temperature for in-situ polymerization, and carrying out washing and centrifugally drying to obtain a nickel hydroxide nanosheet precursor/polydopamine composite material, and carrying out heat treatment and vulcanization with sublimed sulfur powder in a tubularfurnace in nitrogen atmosphere at a certain temperature to obtain the composite material. The preparation process is simple, easy to operate, green and non-toxic and friendly in material preparationprocess; and the prepared nickel disulfide carbon nano composite material is stable in structure, uniform in morphology and high in dispersion. The obtained nickel disulfide carbon nano composite material can be an ideal electrode material of a high-performance lithium ion battery, a supercapacitor and other new energy devices.

The invention relates to an environmental-friendly comprehensive utilization method for a laterite-nickel ore, which comprises the following steps of: (1) grinding the laterite-nickel ore, mixing with sulfuric acid, roasting, dissolving out roasted clinker and filtering to obtain silicon dioxide and dissolution liquid; (2) deironing the dissolution liquid to obtain liquid No.2 and filter residue (iron compounds), wherein the liquid No.2 comprises aluminum, nickel and magnesium and can be treated by the step (3) or (4); (3) precipitating the aluminum in the liquid No.2 by using alkali, filtering, precipitating the nickel in filtrate by using sodium sulfide, filtering, precipitating the magnesium by using the alkali, and treating filter residue to obtain aluminum oxide, nickel hydroxide, nickel sulfide and magnesium oxide respectively; and (4) precipitating the aluminum and the nickel in the liquid No.2 by using the alkali, treating mixed slag containing the aluminum and the nickel by using the alkali to obtain aluminum hydroxide and nickel hydroxide products, and precipitating the magnesium in filtrate subjected to aluminum and nickel precipitation by using ammonia or ammonium saltto obtain a magnesium oxide product. The method is suitable for treating various laterite-nickel ores, three wastes (waste gas, waste water and waste residue) are not generated, and valuable components magnesium, nickel, iron, aluminum and silicon in the laterite-nickel ore are separated and extracted.

The nickel hydroxide particles for a nickel hydroxide electrode may be treated using an alkaline solution of a strong oxidizing agent such as sodium or potassium persulfate to modify the surface nickel hydroxide structure. The resulting modified surface structure has been found to impart various benefits to electrodes formed from the nickel hydroxide. It is believed that the oxidation of cobalt compounds at the surface of the nickel hydroxide particles results in a highly conductive cobalt compound that plays an important role in the high reliability, high stability and high capacity utilization of nickel electrodes as described herein.

The invention discloses a nickel hydroxide/nickel disulfide/foam nickel composite and a preparation method thereof, and application thereof. The composite is expressed in the form of Ni(OH)2/Ni3S2/NFand can be used as an electrode. In the electrode structure, the nano-stem-like Ni3S2/NF is a conductive skeleton, and the Ni(OH)2 nanosheet is equivalent to a leaf and grows on the nano-stem-like Ni3S2/NF skeleton. The heterointerface of Ni(OH)2 and Ni3S2 having a defect structure is the active center. The Ni(OH)2/Ni3S2/NF electrode can be used as a bifunctional catalyst, has excellent cathodic catalytic hydrogen evolution and anodic catalytic oxygen evolution reaction performance, and has high current long-term total electrolysis hydrogen production and oxygen production stability. Comparedwith noble metal catalysts such as Pt and RuO2, the catalyst synthesis method is simple, rich in raw materials and low in cost.

The invention relates to a ferronickel hydroxide/reduction-oxidation graphene electrochemical oxygen evolution catalyst with nickel foam as a carrier and a preparation method of the ferronickel hydroxide/reduction-oxidation graphene electrochemical oxygen evolution catalyst. The nickel foam is used as the carrier of the catalyst, ferric hydroxide, nickel hydroxide or a compound of the ferric hydroxide and the nickel hydroxide is used as the active component of the catalyst, and reduction-oxidation graphene is used as the conductive material of the catalyst. The catalyst is prepared through a water heating and impregnation method. Firstly, the nickel foam is subjected to ultrasonic cleaning and drying; then, a certain amount of nickel salt and a certain amount of urea are weighed, dissolvedin deionized water and stirred to be evenly mixed at the room temperature; then, oxidized graphene is added, ultrasonic treatment is conducted, and evenly-dispersed mixed liquor is obtained; the nickel foam and the mixed liquor are transferred into a water heating kettle and react for 12 h to 24 h at the temperature being 120-200 DEG C; the nickel foam subjected to reaction is cleaned and dried;and finally, after the nickel foam is soaked in an iron salt solution with the concentration ranging from 5 mmol/L to 30 mmol/L for 0 h to 48 h, cleaning and drying are conducted, and the ferronickelhydroxide/reduction-oxidation graphene electrochemical oxygen evolution catalyst with the nickel foam as the carrier is obtained. The catalyst is good in catalysis activity and high in stability; andthe preparation method is simple and controllable, and industrial popularization is facilitated.

The invention discloses a foamed nickel self-supported flake-shaped Ni3P/C composite material for a sodium ion battery negative electrode and a preparation method for the composite material. According to the composite material, the flake-shaped Ni3P is uniformly growing on the foamed nickel; and the Ni3P is uniformly coated with a C film. The preparation method for the composite material comprises the steps of taking a nickel compound as the raw material, and uniformly growing a flake-shaped nickel hydroxide layer on the surface of the nickel compound through a hydrothermal method; then taking sodium hypophosphite as a phosphorus source, and performing thermal insulation at a temperature of 300 DEG C for 2h to prepare the foamed nickel self-supported flake-shaped Ni3P material; and finally, performing carbon coating on the foamed nickel self-supported flake-shaped Ni3P material to obtain the foamed nickel self-supported flake-shaped Ni3P/C composite material. The sodium ion battery prepared from the Ni3P/C composite material prepared by the invention has excellent specific capacity, rate capability and stable cycling performance; and in addition, the preparation method is simple and feasible, wide in raw material resources and suitable for industrial production.

The invention discloses a method for preparing nanometer nickel oxide and application of the method. The method includes adding a certain quantity of inorganic salt and organic liquor into aqueous liquor to be used as electrolyte; using metal nickel as an electrode; applying voltage to two ends of the electrode; forming nickel hydroxide nano-particles by means of regulating the concentration of the electrolyte, the amplitude of the voltage, the reaction time and the stirring speed; then annealing the nickel hydroxide nano-particles at the temperature of 300 DEG C; and obtaining the nickel hydroxide nano-particles. A formaldehyde sensor built on the basis of the nanometer nickel oxide can be used for detecting formaldehyde gases with different concentrations. The method has the advantages that the nanometer nickel oxide is prepared in the electro-chemical method the nanometer nickel oxide is used for building the formaldehyde sensor, a process is simple, operation is convenient, environmental pollution is prevented, the cost of a product is low, repeatability is good, and the method is applicable to large-scale industrial production.

An alkali storage battery using powder generation elements composed of a positive electrode comprising nickel (Ni) oxide as main materials, a negative electrode, a separator and an alkali aqueous solution, wherein materials of said positive electrodes are spherical or elliptic powders whose tapping density is not less than 2.2 g/cc mainly composed of nickel hydroxide (Ni(OH)₂), powders comprise core powders with innumerable microscopic concaves and convexes on surfaces mainly composed of spherical or elliptic β-type Ni(OH)₂, and fine powders composed of metal cobalt (Co) and/or Co oxide, and fine powders are crushed and pressed in substantially all concave portions of microscopic concaves and convexes of said core powders, thereby integrated with core powders, and surface layers of powders are coated with fine powders and are flattened, and core powders and/or fine powders have innumerable micro pores which penetrate from surfaces to inner portions.

The invention relates to a method for preparing nano nickel bicarbonate, which comprises the following steps of: adding water into urea or urotropine for dissolving, adding nickel salt or nickel hydroxide and stirring, wherein the mole ratio of the urea or the urotropine to nickel is 1:1-16:1, and the concentration of the nickel salt in solution is 0.1-1.0mol/L; shifting the obtained solution into a hydrothermal reactor; after reacting at 90-240 DEG C for 1-96 hours, cooling; and filtering obtained reaction mixed liquid, washing with distilled water and anhydrous ethanol and placing in a vacuum drying box at 60 DEG C for drying to obtain a cubic phase nano nickel bicarbonate square block with the size of 100nm or so. The invention uses the urotropine or the urea as a precipitator, NH3 andCO2 generated by the precipitator dissolve nickel hydroxide, and the pure cubic phase Ni(HCO3)2 nano crystal is prepared finally.

The invention relates to a method for producing nickel carbonyl powder from nickel hydroxide, belonging to the technical field of powder metallurgy. The method comprises the following steps: adding nickel hydroxide into a rotary roasting furnace, removing water at high temperature, and roasting to obtain nickel oxide; adding the oxide into a hydrogen reducing furnace to perform reduction, thereby generating simple substance active nickel; adding the simple substance active nickel into a nickel carbonyl synthesis reactor to make counterflow contact with CO, and reacting to generate nickel carbonyl gas; delivering the nickel carbonyl gas to a nickel carbonyl decomposer by a blower, and delivering generated nickel carbonyl residues into a nickel carbonyl treater to perform passivating treatment; and decomposing the nickel carbonyl gas in the nickel carbonyl decomposer to produce the nickel carbonyl powder. The invention does not need to perform extra treatment on the raw material, and has the advantages of mild reaction conditions, simple technique, high production safety, low cost, high synthesis efficiency and the like.

The invention provides a self-collecting supercapacitor electrode material and a preparing method thereof. The electrode material is composed of a foamed nickel current collector and a b-nickel hydroxide hexagonal nanosheet grown on the surface of the foamed nickel current collector in an in-situ mode. According to the preparing method of the electrode material, the conductive current collector foamed nickel is immersed into a hydrogen peroxide solution for low-temperature hydrothermal oxidation, and then the b-nickel hydroxide hexagonal nanosheet is directly grown on the conductive current collector in the in-situ mode. The electrode material has the advantages of being large in specific volume and good in circulating stability. Due to the fact that the active material nickel hydroxide is directly grown on the foamed nickel current collector, the electrode material can be used directly without extra current collectors, or conductive additives or binding agents, complicated electrode preparing processes are omitted, and self-collecting is achieved. The electrode material preparing method only relates to the cheap hydrogen peroxide solution, other chemical reagents are not needed, and then zero pollution and low cost are guaranteed. The preparing processes only relate to hydrothermal oxidation and vacuum drying, operation is easy and convenient, reproducibility is good, and bulk preparation and industrialized production are facilitated.

The invention discloses a preparation method of flower-like alpha-Ni(OH)2. The preparation method comprises the following steps of: adding a nickel salt and urotropine into de-ionized water, stirring and dissolving, wherein the amount ratio of the nickel to the urotropine is 1:1-1:2, and the concentration of the nickel salt in the solution is 0.1-1 mol/L; taking 5 mL of mixed solution; adding 10-35 mL of lower alcohol into the mixed solution; adding the obtained solution into de-ionized water until the volume is 40 mL; transferring to 50 mL polytetrafluoroethylene-lined high pressure reaction kettle; reacting at 160 DEG C for 2 hours; cooling; filtering; washing with the de-ionized water and absolute ethyl alcohol for many times to filter a product respectively; an holding in a vacuum drying box of 60 DEG C for drying to prepare the flower-like alpha-Ni(OH)2. According to the preparation method, the urotropine is used as a precipitator, the ethanol is used as a solvent, and the finally purer flower-like alpha-Ni(OH)2 is prepared.

A nickel-series rechargeable battery whose cathode active material comprising a material containing an amorphous phase-bearing nickel hydroxide particulate which in X-ray diffraction using K alpha -rays of Cu as a radiation source, has a diffraction peak of a (001) face appeared near a diffraction angle 2 theta = 19 DEG having a half-value width of more than 1.2 DEG and has a diffraction peak of a (101) face appeared near a diffraction angle 2 theta = 38 DEG having a half-value width of more than 1.5 DEG . A process for the production of said rechargeable battery is also provided.

The invention relates to solid oxide powder and a preparation method thereof, in particular to nickel oxide powder and a preparation method thereof. The preparation method of the nickel oxide powder disclosed by the invention comprises the following steps of (1) mixing a nickel salt solution with a complexing agent, and performing stirring so as to obtain a complex compound solution, wherein the mole ratio of nickel ions contained in the nickel salt solution to donor atoms in the complexing agent is (1 to 5) to (1 to 6); (2) adding a strongly alkaline solution to the complex compound solution obtained in the step (1), performing stirring to obtain nickel hydroxide precursor precipitation, and washing the nickel hydroxide precursor precipitation with water so as to obtain paste; (3) drying the paste obtained in the step (2) so as to obtain a product precursor; and (4) roasting the product precursor obtained in the step (3) so as to obtain the nickel oxide powder. The nickel oxide powder prepared by the preparation method disclosed by the invention is free from clumping, tiny in particle size, low in impurity taste, controllable in sulfur taste, and particularly low in sodium taste and chlorine taste, and can be used as a nickel oxide powder material used for electronic components, and electrodes of solid oxide fuel cells.

The object of the invention is an electrode comprising a continuous current collector (1) wherein 50% or more of the surface of said collector has a roughness Ra1 comprised between 0.8 and 15 μm, measured for a base length comprised between 2 and 200 μm, said collector being coated with a mixture (2) comprising active carbon having a specific surface area greater than or equal to 500 m²/g and a binder comprising a mixture of at least one cellulosic compound and at least one styrenic copolymer. The object of the invention is also an asymmetric supercapacitor comprising at least one electrode according to the invention. The invention also relates to a method for making a carbon electrode for an asymmetric supercapacitor.

The invention discloses a secondary bismuth oxychloride/nickel hydroxide alkaline battery and a preparation method thereof. Bismuth oxychloride serves as negative electrode materials, nickel hydroxide serves as positive electrode materials, and alkaline solution serves as electrolyte solution. A preparation method of the bismuth oxychloride includes the steps: dripping deposition agents into bismuth chloride solution, and performing reaction; or hydrolyzing bismuth nitrate or bismuth sulfate to form supernatant solution, and dripping chloride ion solution into the supernatant solution according to a certain mole ratio of bismuth and chlorine; or mixing bismuth materials and solution to form supernatant solution, and dripping hydrochloric acid solution into the supernatant solution according to a certain mole ratio of the bismuth and the chlorine; controlling terminal PH (potential of hydrogen) to be 1-5, and preparing the bismuth oxychloride materials formed by nano sheets. The thickness of each bismuth oxychloride material ranges from 5nm to 100nm. Specific capacity of the battery prepared by the method is 298mAh/g under 1A/g of current density. The battery is a novel reversible secondary chemical power supply with wide application prospects, large in electric capacity, excellent in electrochemical performance and environmentally friendly.

The invention discloses a preparation method and an application of a nickel-iron bimetal hydroxide nano-film material. Carbon paper is used as a substrate, and a nickel-iron bimetal hydroxide electrocatalyst is prepared by selecting and using a two-step electro-deposition method and a one-step etching method. A Prussian blue nano-film material loaded on the carbon paper is obtained by first-step electro-deposition, a nickel hydroxide/Prussian blue nano-film material loaded on the carbon paper is obtained by second-step electro-deposition, and finally, the nickel hydroxide/Prussian blue nano-film material is put into a strong alkali solution for etching to obtain a nickel-iron bimetal hydroxide nano-film material loaded on the carbon paper. The method is simple and easy to implement, safe to operate, green and pollution-free. Secondly, the material is an amorphous nano-film material which is rich in oxygen vacancies and porous, has ultralow overpotential and Tafel slope, and shows excellent oxygen evolution catalytic activity. When electrolysis is carried out in an alkaline electrolyte, the potential is almost kept unchanged, and excellent electrolytic stability is shown.

The invention discloses an activated graphene/needle-shaped nickel hydroxide nanocomposite material and a preparation method thereof, and belongs to the technical field of a capacitor electrode material. According to the preparation method, graphene prepared by an oxidation-reduction method is taken as a raw material, KOH or NaOH is taken as an activating agent to prepare the activated graphene, and nanometer needle-shaped nickel hydroxide is loaded on the surface of the activated graphene to prepare the activated graphene/needle-shaped nickel hydroxide nanocomposite material. The activated graphene has very high specific area, and the nanometer needle-shaped nickel hydroxide is uniformly loaded on the surface of the activated graphene. The supercapacitor electrode prepared from the composite material has relatively high specific capacity and energy density and excellent cycle stability.

The invention discloses a preparation method for a nickel hydroxide ultrathin nanosheet, and relates to preparation of an inorganic nanometer material. The provided preparation method is simple in method, low in cost and strong in controllability, and comprises the following steps: dissolving soluble nickel salt into water to prepare a nickel salt water solution; diluting ethanolamine with water to prepare an ethanolamine water solution; mixing the nickel salt water solution and the nickel salt water solution to obtain a nickel hydroxide nanosheet mother solution; conducting still standing on the nickel hydroxide nanosheet mother solution so as to obtain the nickel hydroxide ultrathin nanosheet. The prepared nickel hydroxide ultrathin nanosheet can be applied to nanofiltration membrane preparation: a porous microfiltration membrane is selected as a base membrane, a mono-dispersed solution of the prepared nickel hydroxide ultrathin nanosheet is filtered on the base membrane, and the nickel hydroxide ultrathin nanosheet is formed into a nickel hydroxide ultrathin nanosheet film through free stacking, so as to obtain a nanofiltration membrane consisting of the base membrane and the nickel hydroxide ultrathin nanosheet film.

A method for producing a metal oxide from a metal salt selected from the group consisting of nickel hydroxide, cobalt hydroxide, mixed nickel-cobalt hydroxide, nickel carbonate, cobalt carbonate, mixed nickel-cobalt carbonate, and combinations thereof, The method comprises providing a mixture of metal salts, mixing the metal salts with a binder selected from the group consisting of inorganic binders, organic binders, and combinations thereof, forming the mixture into a briquette, and calcining the briquette to produce metal oxides. A method for producing metallic nickel or cobalt, comprising providing a metal salt, the metal salt being selected from nickel hydroxide, cobalt hydroxide, mixed nickel hydroxide-cobalt, nickel carbonate, cobalt carbonate and combinations thereof, the metal salt mixing with a binder selected from inorganic binders, organic binders, and combinations thereof to form a mixture, optionally adding water, forming the mixture into a mass, drying the mass, adding an effective reducing amount of coke and/or coal, and direct reduction of the dried agglomerate with an effective amount of heat to produce metallic nickel and/or cobalt. Coke fines may be added to the mixture prior to agglomeration. A mass comprising a metal salt selected from the group consisting of nickel hydroxide, cobalt hydroxide, mixed nickel-cobalt hydroxide, nickel carbonate, cobalt carbonate, mixed nickel-cobalt carbonate, and combinations thereof; and a binder; The binder is selected from inorganic binders, organic binders and combinations thereof.