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

The invention discloses a nickel-containing etching wastewater treatment process, which belongs to the technical field of environmental protection, and comprises a raw water regulating tank, a pH pre-regulating tank, a heterogeneous catalytic oxidation tower, a neutralization coagulation tank, an inclined tube sedimentation tank and a clean water tank which are connected in sequence. According to the process, under the neutral condition, a catalyst loaded with cobalt manganese oxide is used for activating sodium hydrogen persulfate, high-activity sulfate free radicals are generated, a Ni-EDTA complex structure is fractured in a targeted mode, free nickel ions are released in situ, organic ligands are synchronously mineralized, and the adding amount of sodium hydrogen persulfate is dynamically adjusted through a clean water pool closed-loop control system; and high-purity nickel hydroxide precipitate is generated through alkaline precipitation and coagulation, so that efficient solid-liquid separation is realized. The treatment process disclosed by the invention is compact in flow and stable in operation, effectively solves the problems of difficult complex breaking, low nickel removal efficiency, high sludge toxicity, difficult resource recovery and the like when the EDTA complex nickel wastewater is treated by a traditional method, realizes closed-loop recovery of nickel resources, and has the remarkable advantages of low cost, high efficiency and environmental friendliness.

The invention discloses a process for treating nickel wastewater containing nickel acetate cleaning water and nickel acetate concentrated water, which comprises the following steps: S1, filtering nickel wastewater, S2, carrying out primary concentration treatment, S3, carrying out secondary concentration treatment, S4, treating by a sodium metaaluminate method, S5, carrying out collaborative filtration treatment, and S6, discharging RO (Reverse Osmosis) produced water up to the standard. The method comprises the following steps: primarily enriching nickel ions by adopting primary nickel concentration treatment and secondary nickel concentration treatment, adding a sodium metaaluminate solution into a mixed solution, enabling the pH value of the mixed solution to be 8-12, enabling the nickel ions to react with hydroxyl ions to generate a nickel hydroxide precipitate, adding a sulfuric acid solution to adjust the pH value of the mixed solution back to 6.5-7.5, hydrolyzing sodium metaaluminate to generate an aluminum hydroxide precipitate, and carrying out secondary nickel concentration treatment on the aluminum hydroxide precipitate; aluminum hydroxide adsorbs nickel hydroxide to form a composite precipitate, aluminum ions and nickel ions are subjected to a competitive complexation reaction, and a flocculating agent is added into a mixed solution to form a flocculent precipitate, so that the reaction time is short, the nickel content in the nickel sludge can be greatly increased, the treatment period can be shortened, and the operation cost can be reduced.

The application discloses a composite precipitant for wet refining of laterite nickel ore and a wet refining method of laterite nickel ore. The composite precipitant for wet refining of laterite nickel ore is composed of a mixture of magnesium oxide and sodium hydroxide, and the mass fraction of sodium hydroxide in the composite precipitant is greater than 0 and less than or equal to 99%. The wet refining method of laterite nickel ore comprises the following steps: directly or after being grinded, the composite precipitant is added into an acidic solution to be refined, and stirring is performed to make the composite precipitant fully react with the acidic solution to be refined; after concentration, a clear liquid and a solid-containing slurry are obtained; the solid-containing slurry is filtered and washed with water to obtain a solid containing nickel hydroxide, cobalt hydroxide or nickel hydroxide-cobalt hydroxide, so that nickel, cobalt or nickel-cobalt is precipitated. The composite precipitant and the wet refining method of laterite nickel ore have the advantages of simple process, low cost, easy process control, easy settlement and filtration of nickel hydroxide (and cobalt hydroxide) precipitation, and the production efficiency can be significantly improved and the energy consumption can be reduced.

The invention discloses a method for preparing a sulfur-doped nickel hydroxide-based self-supporting electrolyzed water anode, and belongs to the technical field of preparation of electrolyzed water catalytic electrodes, and the method comprises the following steps: S1, preparing strong oxidizing salt, thiourea and transition metal salt into an active solution; s2, pretreating the nickel-containing metal substrate to obtain a precursor; and S3, immersing the precursor in an active solution for ultrasonic impregnation, and performing in-situ oxidation to prepare the sulfur-doped nickel hydroxide-based self-supporting electrolytic water anode. According to the method for preparing the sulfur-doped nickel hydroxide-based self-supporting electrolytic water anode, an oxidizing agent-thiourea-transition metal salt synergistic reaction system is adopted, an ultrasonic-assisted technology is combined, and a high-performance catalytic layer is directly grown on the surface of the metal substrate in situ at room temperature; the invention aims to synchronously realize high catalytic activity, excellent stability and macro preparation of the electrode and fundamentally solve the core pain points of long process, high energy consumption, difficulty in amplification and the like in the prior art.

The invention provides a gas sensor and a method for preparing the gas sensor through laser direct writing. The method comprises the following steps: enabling a metal electrode to be in contact with laser direct writing ink, wherein the laser direct writing ink comprises a nickel source, a porous structure guiding agent and a solvent; laser irradiates a specified contact area of the metal electrode and the laser direct-writing ink, so that the metal electrode absorbs the laser to generate heat so as to form a hydrothermal reaction area in the specified contact area, and the laser direct-writing ink in the hydrothermal reaction area is subjected to a hydrothermal reaction, so that porous nickel hydroxide grows on the metal electrode, and a precursor structure is obtained; and carrying out annealing treatment on the precursor structure so as to convert the porous nickel hydroxide into porous nickel oxide, thereby obtaining the gas sensor. The gas sensor provided by the invention has the porous nickel oxide which has a relatively large specific surface area, so that the effective contact area between the gas sensor and target gas can be increased, and the gas responsivity of the gas sensor is improved.

The invention belongs to the field of PET (polyethylene glycol terephthalate) plastic waste treatment, and particularly relates to preparation of a copper oxide-nickel hydroxide core-shell structure catalytic material and application of the copper oxide-nickel hydroxide core-shell structure catalytic material to preparation of high-added-value formic acid by upgrading electro-catalysis PET plastics, and the preparation method comprises the following steps: (1) placing a copper conductive substrate in an alkali etching mixed solution for alkali etching treatment, obtaining a conductive substrate on which a Cu (OH) 2 precursor grows; (2) placing the conductive substrate on which the Cu (OH) 2 precursor grows in a muffle furnace for heat treatment to obtain a conductive substrate on which CuO nanowires grow; and (3) placing the conductive substrate on which the CuO nanowire grows in a hydrothermal kettle, and obtaining the CuO-coated Ni (OH) 2-x core-shell structure catalyst through a hydrothermal method.

The invention discloses a method for deeply removing arsenic from a nickel sulfate solution, which comprises the following steps: adjusting the pH value by using nickel hydroxide to form colloid to preliminarily remove arsenic, oxidizing by using sodium sulfate, and adding polyferric sulfate to form ferric hydroxide colloid to deeply adsorb and remove arsenic, and is simple in process, convenient to implement in the production process, capable of greatly reducing the cost and reducing the environmental pollution, and suitable for industrial production. The method comprises the following steps: adjusting the pH value of a low-pH leaching solution / anolyte / crude nickel sulfate dissolving solution to 4.0 or more by using nickel hydroxide, carrying out filter pressing to remove slag, adding arsenic ions in a sodium persulfate oxidation solution, reacting for 30 minutes, adding polyferric sulfate, reacting for 30 minutes, and carrying out filter pressing to obtain a nickel sulfate solution which is almost free of arsenic, and the method is efficient, safe and environment-friendly.

The invention provides chlorine-doped nickel oxide, a preparation method and application thereof and a photoelectric device, and relates to the field of photoelectric materials.The preparation method of the chlorine-doped nickel oxide comprises the following steps that S10, an aqueous solution of nickel salt and chlorine salt is obtained, an alkaline solution is dropwise added, centrifugation is conducted, and a coprecipitate is obtained; s20, washing, drying and roasting the coprecipitate to obtain chlorine-doped nickel oxide; wherein the molar ratio of the nickel salt to the chlorine salt is (10-20): (1-4). In the technical scheme provided by the invention, the nickel salt and the chlorine salt are co-precipitated to generate a co-precipitate of nickel hydroxide and chloride, and then the co-precipitate is washed, dried and roasted to prepare the chlorine-doped nickel oxide, so that the hole mobility of the chlorine-doped nickel oxide is improved; the alkaline solution is dropwise added for coprecipitation, so that the particle size of the coprecipitate can be reduced, and the nanoscale chlorine-doped nickel oxide is prepared, so that the dispersity of the chlorine-doped nickel oxide in a mobile phase is improved, and the chlorine-doped nickel oxide can be applied to preparation of a hole transport film and improvement of the uniformity of the hole transport film.

The invention belongs to the technical field of hydrogen production by electrocatalytic decomposition of water, and provides an iron-doped nickel hydroxide composite iron-doped cerium oxide electrocatalyst and application thereof in electrolyzed water. The iron-doped nickel hydroxide composite iron-doped cerium oxide electrocatalyst comprises a nickel substrate, wherein a porous catalytic activity layer of three-dimensional flower-shaped spherical nanoparticles formed by stacking two-dimensional nanosheets is loaded on the surface of the nickel substrate. The catalytic active layer comprises an iron-doped hexagonal stacked nickel hydroxide structure, the catalytic active layer comprises an iron-doped cubic stacked cerium oxide structure, and no iron with a crystalline structure exists in the catalytic active layer. The iron-doped nickel hydroxide composite iron-doped cerium oxide electrocatalyst disclosed by the invention shows excellent oxygen evolution performance in an oxygen evolution reaction of electrocatalytic water decomposition.

The invention relates to the technical field of electro-catalytic material synthesis, and particularly discloses a tower-shaped nickel hydroxide catalytic material and a preparation method thereof. The preparation method of the tower-shaped nickel hydroxide catalytic material comprises the following steps: (1) surface treatment of a nickel substrate: performing ultrasonic cleaning treatment on the nickel substrate, and performing vacuum drying to obtain the cleaned nickel substrate; and (2) synthesis of tower-shaped nickel hydroxide: dissolving phosphate to obtain a phosphate solution, adding hydrogen peroxide, stirring, adding the cleaned nickel substrate, and carrying out hydrothermal reaction to obtain a semi-finished product of tower-shaped nickel hydroxide. And (3) cleaning and drying the tower-shaped nickel hydroxide: cleaning the semi-finished product tower-shaped nickel hydroxide, and carrying out vacuum drying to obtain the tower-shaped nickel hydroxide catalytic material. The method is simple in process, relatively low in cost and easy for large-scale synthesis, and has a relatively good large-scale commercial application prospect; and the specific morphology effectively exposes active crystal faces and active sites, and as an excellent catalyst, the catalyst can improve the hydrogen production rate and the organic matter oxidation rate.

The invention discloses an electrochemical preparation method and application of a superfine platinum particle modified nickel-iron double hydroxide nanosheet array, and belongs to the technical field of water electrolysis. The preparation method comprises the following steps: in a three-electrode system, taking a mixed solution of nickel salt and ferrous salt as an electrolyte, and carrying out electro-deposition by adopting a constant potential deposition method to obtain a carbon cloth material for in-situ growth of a ferro-nickel hydroxide nanosheet array; and then in a two-electrode system, a mixed solution of chloroplatinic acid and potassium hydroxide is used as an electrolyte, and electro-deposition is performed by adopting a constant current deposition method, so that uniform loading of superfine platinum particles on the surface of the ferro-nickel double hydroxide nanosheet array is realized. The superfine platinum particle modified nickel-iron double hydroxide nanosheet array prepared by the preparation method disclosed by the invention can show excellent catalytic activity and stability in hydrogen production by alkaline electrolysis of water.

The invention relates to an MHP precipitation method based on a compound alkali precipitator, which comprises the following steps: adding a compound alkali solution into a laterite-nickel ore liquid after iron and aluminum are removed, and carrying out precipitation reaction to obtain cobalt nickel hydroxide slurry; the compound alkali in the compound alkali solution comprises a mixture of sodium carbonate and sodium hydroxide; and carrying out post-treatment separation on the cobalt nickel hydroxide slurry to obtain the MHP. According to the method, a sodium hydroxide and sodium carbonate compounded system is used as a precipitator, and the MHP is prepared under the cooperation of sodium carbonate and sodium hydroxide, so that the problem of local over-alkalinity caused by direct use of strong-alkalinity sodium hydroxide is solved, the content of manganese in the obtained MHP is reduced, the content of nickel and cobalt in the MHP is increased, and the cost of subsequent MHP refining for preparing crystals is conveniently reduced; meanwhile, the reaction rate is more controllable, and the obtained MHP is better in filterability and lower in water content.

The application provides a method for efficiently and selectively removing iron and chromium from cobalt-nickel hydroxide raw materials, which can realize the synchronous and deep removal of iron and chromium impurities for high-iron and high-cobalt nickel hydroxide raw materials through the synergistic process of acid leaching, reduction pH adjustment, oxidation precipitation and solid-liquid separation, and the concentrations of iron and chromium in the purified nickel-cobalt liquid are both controlled below 10 mg / L, and the impurity removal precision meets the subsequent high-purity production requirements; the chromium-goethite co-precipitation crystal product is generated in situ in the reaction, and has excellent settling and filtering performance, solving the problems of difficult colloid precipitation and filtration and easy equipment blockage in the traditional method, and the process route is short and the reaction conditions are mild, which can effectively reduce the adsorption entrainment and co-precipitation loss of nickel and cobalt valuable metals, and while realizing the efficient and deep purification of iron and chromium, the excellent solid-liquid separation performance and high main metal recovery rate are also considered, and the method is suitable for the industrial purification treatment of high-iron and high-chromium complex cobalt-nickel raw materials.

The application discloses a preparation method of a nickel-doped and high-hydrated cobalt-chromium-iron ore monocrystal under high temperature and high pressure, and the method comprises the following steps: preparing a cylindrical cobalt-chromium-iron ore sample by taking solid basic cobalt carbonate powder, solid chromium (III) acetate hydroxide crystal powder, solid nickel stearate, solid oxalic acid powder, solid chromium hydroxide powder, solid nickel hydroxide powder and liquid dilute nitric acid as starting raw materials; preparing water source sheets by taking chromium hydroxide powder and nickel hydroxide powder in a weight ratio of 4:1; placing two water source sheets at two ends of the cylindrical cobalt-chromium-iron ore sample respectively and then putting them into a double-capsule structure sample bin; and obtaining a cobalt-chromium-iron ore monocrystal after high-temperature and high-pressure reaction, so that the blank of the preparation technology of the nickel-doped and high-hydrated cobalt-chromium-iron ore large-grain monocrystal under the current high-temperature and high-pressure condition is solved, and the experimental sample of the nickel-doped and high-hydrated cobalt-chromium-iron ore large-grain monocrystal is obtained.

The rechargeable battery cell can include an electrode having a plurality of three-dimensional channels defined therethrough, at least 90% of the three-dimensional channels having pores between 50 nanometers and 400 microns in size. An ion exchange material can be disposed to define an interface with at least a portion of the electrode. In some embodiments, the electrode includes a zinc (Zn)-containing anode and a cathode including at least one of nickel hydroxide (Ni(OH)2), nickel oxyhydroxide (NiOOH), manganese dioxide (MnO2), copper oxide, and bismuth oxide.

This application provides a method and system for extracting scandium from a scandium-containing cobalt-nickel hydroxide solution, belonging to the field of heavy metal recovery technology. The method includes the following steps: extracting the scandium-containing cobalt-nickel hydroxide solution with an organic extractant to obtain a scandium-containing organic phase; washing the scandium-containing organic phase to obtain a purified organic phase; back-extracting the purified organic phase with hydrochloric acid to obtain a scandium-containing back-extract and a back-extracted organic phase; performing scandium extraction treatment on the scandium-containing back-extract to obtain scandium oxide; and regenerating the back-extracted organic phase sequentially with sodium carbonate and dilute sulfuric acid to obtain a regenerated organic extractant, which is then reused. This application first sequentially washes the chlorine with sodium carbonate and sulfuric acid solutions, solving the emulsification problem in the extraction, washing, and back-extraction stages caused by washing with sodium carbonate solution. Furthermore, compared to directly using sulfuric acid solution for washing, this application uses less sulfuric acid in the regeneration stage, preventing phase miscibility during the washing process.

This invention provides a method for removing impurities and recovering nickel anolyte from electrolytic nickel. The method includes the following steps: (1) mixing the electrolytic nickel anolyte with liquid alkali, separating the solid and liquid components to obtain nickel hydroxide and filtrate, evaporating the filtrate to obtain sodium sulfate; mixing the electrolytic nickel anolyte with a nickel source to obtain a mixed solution; (2) mixing the mixed solution with barium salt for lead removal; (3) adjusting the pH of the material obtained after lead removal with nickel hydroxide to obtain an arsenic removal solution, mixing the arsenic removal solution with polyferric sulfate for arsenic removal; (4) mixing the material obtained after arsenic removal with an oxidant to obtain an iron removal solution, performing solid-liquid separation on the iron removal solution to obtain lead-, arsenic-, and iron-removed cathode liquid and iron-containing slag, adding sodium sulfate to the lead-, arsenic-, and iron-removed cathode liquid, and reusing it in the electrolytic nickel process. The method of this invention can efficiently and quickly remove lead, arsenic, and iron from electrolytic nickel anolyte and reuse it.

The present invention discloses a method for preparing a nickel oxide thin film, its product and application, belonging to the technical field of photovoltaic materials and devices. The preparation method of the present invention includes: providing a homogeneous aqueous solution containing a nickel source compound and a basic amino acid, and chemically bath-depositing the homogeneous aqueous solution on the surface to be coated of a substrate, so that a nickel hydroxide film layer is formed in-situ on the surface to be coated, and then annealing the nickel hydroxide film layer to generate a nickel oxide thin film. By introducing a basic amino acid into the nickel source chemical bath aqueous solution for chemical bath deposition, the present invention can not only effectively and reasonably adjust the nucleation rate of nickel hydroxide by forming multi-dentate coordination with moderate strength between the basic amino acid and nickel ions, but also prevent the aggregation of nanoparticles through steric hindrance effect, effectively improving the dispersion effect of nanoparticles. Thus, the deposition behavior of nickel hydroxide nanoparticles is synergistically optimized in two aspects, and finally the controllable preparation of a nickel oxide thin film with uniform density and good crystallinity is achieved.

The invention provides a method for preparing nickel hydroxide from laterite-nickel ore, which comprises the following steps: after the laterite-nickel ore is pulped, carrying out iron and aluminum removal treatment to obtain iron and aluminum removed liquid; carrying out resin adsorption treatment on the iron and aluminum removed liquid to obtain nickel adsorbed resin; desorbing the nickel-adsorbed resin to obtain a nickel-rich solution, and sequentially carrying out copper and zinc removal, calcium and magnesium removal, fluorine removal treatment and silicon removal treatment to obtain a nickel salt solution; the nickel salt solution, the liquid caustic soda and the dispersing agent solution are injected into the base solution in a parallel flow mode, nickel hydroxide slurry is obtained through a co-precipitation reaction, and nickel hydroxide is obtained through post-treatment. According to the method, after the laterite-nickel ore is pulped to remove iron and aluminum, nickel is extracted through high selectivity of resin, nickel, manganese and cobalt can be separated and analyzed to obtain nickel-rich solutions, a purified nickel salt solution is obtained through series impurity removal, the purified nickel salt solution reacts with liquid caustic soda, and a high-purity nickel hydroxide product is prepared. And the nickel does not need to be recovered through a complex extraction process.

A positive electrode active material having both higher capacity and safety is provided. Provided is a method for manufacturing a positive electrode active material, including forming a mixed solution containing a cobalt compound and a nickel compound dissolved; making the mixed solution react with an alkaline aqueous solution to obtain a suspension in which a cobalt nickel hydroxide is precipitated; performing first suction filtration of the suspension with use of water; and after the first suction filtration, performing second suction filtration with use of an organic solvent. In the cobalt nickel hydroxide, an atomic ratio of nickel in the sum of an atomic ratio of cobalt and the atomic ratio of nickel is greater than 0 and less than or equal to 0.01.

The invention provides a method for preparing nickel sulfate by using MHP to callback and remove impurities, which comprises the following steps: S1, slurrying: adding water into MHP, stirring and slurrying to obtain cobalt nickel hydroxide slurry; s2, acid leaching: adding sulfuric acid into the cobalt nickel hydroxide slurry to adjust the pH value to 1.0-1.5, and carrying out acid leaching to obtain a pre-callback solution; s3, first-stage callback: preparing a first MHP slurry, adding the first MHP slurry into the pre-callback liquid, callback the pH to 3.0-3.5, and carrying out a stirring reaction to obtain a first-stage callback slurry; s4, second-stage callback: preparing second MHP slurry, adding the second MHP slurry into the first-stage callback slurry, callback the pH to 5.0-5.2, and stirring for reaction to obtain second-stage callback slurry; and S5, carrying out solid-liquid separation on the second-stage callback slurry to obtain a nickel sulfate solution and solid residues. According to the method, the MHP callback impurity removal is adopted, an original lime milk callback process is replaced, the concentration of nickel sulfate is increased, and the calcium bonding risk of a conveying pipeline is reduced.

The invention provides a nickel hydroxide material and a preparation method thereof, and relates to the technical field of nickel-metal hydride batteries. The nickel hydroxide material is of a spherical composite structure and sequentially comprises a multi-element doped nickel hydroxide matrix, a hydroxyl cobalt oxide middle layer and an outer lithium modification layer which are arranged from inside to outside, at least one of a zinc element, an aluminum element and a magnesium element is doped in the nickel hydroxide matrix. According to the nickel hydroxide material, through a unique spherical composite structure and a specific element doping strategy, the electrochemical performance and the structural stability of the material are remarkably improved, and the nickel hydroxide material has a wide application prospect in high-performance battery application.

This invention belongs to the field of secondary utilization technology of metal resources, specifically relating to a method for treating waste liquid from electroplating zinc-nickel alloys. The method includes the following steps: S1, mixing the waste liquid from electroplating zinc-nickel alloys, oxygen, and a catalyst, and performing an oxidation reaction to obtain an intermediate liquid and nitrogen; the oxidation reaction temperature is ≥220℃; S2, adjusting the pH of the intermediate liquid to 13.0-13.5, performing a first filtration separation to obtain nickel hydroxide sludge and filtrate 1; S3, adjusting the pH of filtrate 1, performing a second filtration separation to obtain zinc hydroxide sludge and filtrate 2. This invention first degrades COD to obtain zinc and nickel ions; adjusting a specific pH value generates nickel hydroxide sludge, with zinc ions existing in the system as polyhydroxy zinc anions, achieving separation of nickel and zinc; further adjusting the pH separates zinc from the system as zinc hydroxide sludge precipitate. The operation is simple, with high separation efficiency and high purity.

The invention discloses a method for preparing aluminum-doped nickel hydroxide through hydrothermal synthesis and application, belongs to the technical field of battery materials, and provides an alkaline environment in a mode of thermal decomposition of hexamethylenetetramine so as to prepare the aluminum-doped nickel hydroxide with nano flower-shaped morphology through a hydrothermal method. The prepared aluminum-doped nickel hydroxide is lattice-doped alpha-phase nickel hydroxide, when the aluminum doping amount is 11%, the discharge duration is prolonged by 42% compared with that of undoped nickel hydroxide, and the aluminum-doped nickel hydroxide has the electrochemical performance and structural stability obviously superior to those of beta-phase nickel hydroxide and has higher specific capacity and better electrochemical reaction activity. The method is suitable for preparing the aluminum-doped nickel hydroxide, and is used for preparing an aluminum-doped nickel hydroxide electrode and a nickel-iron battery.

The application provides an electrochemical deposition preparation method and application of a nickel oxide film. A nickel hydroxide film is prepared on a transparent conductive glass substrate through pulse current electrochemical deposition, and is converted into a nickel oxide film with a vertical nanosheet network structure after heat treatment. The application allows ions to be supplemented at an electrode / solution interface by controlling the periodic on-off cycle during electrodeposition, and reduces the thickness of a diffusion layer. Decoupling of the deposition relaxation allows the system to nucleate and grow in a well-controlled manner. The finally obtained nickel oxide film can form a unique heterojunction interface with other materials, produce a vertical carrier transport channel, and has enhanced interface adhesion and excellent carrier extraction capability. After being prepared into a solar cell, the device can still maintain more than 95% of the initial efficiency after running at the maximum power point for 2130 hours in a stability test under simulated AM 1.5G irradiation at 85°C.

The invention discloses a method for constructing a high-performance alpha-phase nickel hydroxide positive electrode plate, and aims to solve the problem that the electrochemical performance cannot be exerted in a total battery due to poor intrinsic conductivity of traditional alpha-phase nickel hydroxide. According to the method, multiple conductive components are introduced in the preparation process of an alpha-phase nickel hydroxide positive electrode to construct a composite conductive network, and the conductive network comprises cobalt-coated beta-phase nickel hydroxide, cobalt-doped alpha-phase nickel hydroxide, cobalt-coated alpha-phase nickel hydroxide, carbon black and the like. Through effective compounding of the material and alpha-phase nickel hydroxide, the electron transmission capability and the structural stability of the alpha-phase nickel hydroxide positive electrode are remarkably improved. After the prepared positive electrode plate is assembled into a nickel-metal hydride battery or a zinc-nickel battery, a performance test is carried out, and a result shows that the nickel-metal hydride battery or the zinc-nickel battery has higher discharge capacity and more excellent cycle life. The method disclosed by the invention is simple in process, high in operability and suitable for development and application of the positive electrode plate of the high-performance alkaline secondary battery, and has a good industrialization prospect.

The invention discloses a collaborative treatment method for low-concentration nickel-containing wastewater. The nickel-containing wastewater is pumped into a reaction tank, carbide slag is added under uniform stirring to carry out a neutralization precipitation reaction, copper slag is added, and ultrasonic collaborative catalysis is used to break the complex nickel, coal slag and pine sawdust are added and aged, and the pH value of the solution is adjusted to 8-9 with acid. The main components of the precipitated slag are nickel hydroxide and calcium sulfate. The precipitated slag is used as a slag-forming agent in the nickel-iron pyrometallurgy process, and the nickel in the slag is recycled to achieve the effect of no waste residue discharge. The method of the invention can reduce the concentration of nickel ions in the wastewater from 50-1500ppm to below 0.5ppm, with a nickel removal rate of more than 99.9%, and the nickel ion concentration in the wastewater meets the emission standard. The raw materials used in the invention are all general industrial solid wastes, the operation is simple, the running cost is low, and the method is economical and efficient. It complies with the national environmental protection concept of treating waste with waste and comprehensively utilizing solid waste resources, is suitable for removing nickel ions in wastewater, and has good application prospects.

The present disclosure relates to a halogen-doped nickel-cobalt-lithium aluminate, a preparation method and application thereof, the method comprising the following steps: S1, mixing nickel hydroxide with an aluminum source in a first solid phase to obtain a first solid material; S2, mixing the first solid material with a cobalt source in a second solid phase, and performing a first heat treatment on the obtained mixture in a first oxygen-containing atmosphere to obtain a second solid material; S3, mixing the second solid material with a lithium source in a third solid phase, and performing a second heat treatment on the obtained mixture in a second oxygen-containing atmosphere; the cobalt source and / or the aluminum source contain halogen. The method has simple steps, is conducive to industrial scale-up implementation and batch production, and the prepared halogen-doped nickel-cobalt-lithium aluminate has relatively uniform mixing of elements; when used as a positive electrode material of a lithium ion battery, the halogen-doped nickel-cobalt-lithium aluminate has a high specific capacity and good cycle performance.

The invention belongs to the technical field of nickel-zinc batteries, and particularly relates to a regeneration method of a retired nickel-zinc battery positive electrode material and an obtained regenerated positive electrode material. The invention provides a method for leaching and directly regenerating an out-of-service nickel-zinc battery positive electrode material by using organic acid. The positive electrode material is leached by adopting the organic acid, a reducing agent is not used, and the organic acid is superior to inorganic acid in the aspects of safety and environmental protection. Stirring and hydrothermal reaction are combined in the regeneration process, so that regeneration preparation of the nickel hydroxide composite material is realized. The regeneration method is safe, simple, easy to implement and small in environmental harm.

This invention discloses a method for modifying lithium manganese iron phosphate (LFP) cathode materials coated with MoS2 / NiO / TiO2. The first step involves preparing a precursor, nickel hydroxide. Nickel nitrate, sodium hydroxide, ammonium molybdate, and thiourea are mixed and stirred uniformly, then reacted in a polytetrafluoroethylene (PTFE) hydrothermal reactor to obtain MoS2 and NiO solid particles. The second step involves mixing MoS2, NiO, and tetrabutyl titanate uniformly, then adding potassium chloride and allowing the mixture to stand to obtain MoS2 / NiO / TiO2 composite particles. Finally, these composite particles are mixed with LFP particles and stirred to obtain the MoS2 / NiO / TiO2 coated LFP cathode material. The modified LFP exhibits increased conductivity, significantly improved specific capacity, rate performance, and stability. Its initial charge-discharge specific capacity reaches 153.8–156.7 mAh / g, and its specific capacity at 2C rate reaches 132.4–140.0 mAh / g. The modification method used in this invention has a simple preparation process and is the first to achieve the goal of improving electrical performance by constructing a MoS2 / NiO / TiO2 composite material on the surface of lithium manganese iron phosphate.