404 results about "Nickel ions" 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 relates to a preparation method of a nickel ion doped modified ferric sodium pyrophosphate positive electrode material, and belongs to the technical field of sodium ion battery positive electrode materials. The nickel ion doped modified ferric sodium pyrophosphate positive electrode material is prepared by adopting an integrated process system of liquid phase uniform mixing, spray granulation and precise segmented calcination. According to the process system, atomic-scale uniform doping of nickel ions and a specific microstructure of a precursor are realized through spray drying, and a plurality of inherent key technical problems of low electronic conductivity, low ion diffusion rate, impurity phase generation and the like of an NFPP material are solved together through a synergistic effect with a subsequent calcining process; furthermore, the discharge capacity of the ferric sodium phosphate pyrophosphate composite material at high rate is improved, so that the battery has relatively high cycling stability.

To provide a positive electrode active material for a lithium ion secondary battery, having high capacity and being excellent in charging and discharging cycle characteristic.SOLUTION: A positive electrode active material contains lithium, cobalt, nickel, aluminum, and oxygen. The spin density due to any one or more of divalent nickel ions, trivalent nickel ions, divalent cobalt ions, and tetravalent cobalt ions is in a predetermined range. The positive electrode active material further contains magnesium. The suitable magnesium concentration is expressed by the concentration relative to cobalt. The positive electrode active material preferably contains fluorine additionally.SELECTED DRAWING: Figure 1

The invention provides a preparation method of a nickel-based composite oxygen evolution anode for alkalescent electrolyte. According to the invention, nickel-based alloy is used as substrates, two same substrates are respectively used as a working electrode and an auxiliary electrode, two-electrode system electrochemical oxidation reduction treatment at room temperature is carried out in a mixed solution of phosphate, carbonate and chloride, and two reconstructed nickel-based composite oxygen evolution electrodes are obtained at the same time. In the electrochemical oxidation process, nickel ions and other metal (Fe, Co, Cr and Mn) ions are dissolved out from the nickel-based alloy under the etching assistance of chloride ions; in the electrochemical reduction process, water on the electrode is reduced to form hydroxyl. Under continuous oxidation reduction, substance reconstruction is carried out to generate a composite catalyst layer of phosphate, carbonate and hydroxide of nickel and other metals, so that not only can the oxygen evolution activity be improved, but also metal dissolution and corrosion passivation when the catalyst is used in a weakly alkaline solution can be inhibited, and the durability of the electrode is greatly improved.

The invention belongs to the technical field of conductive microsphere preparation, and particularly relates to a surface-roughened nickel-plated conductive microsphere and a preparation method and application thereof. The preparation method comprises the following steps: carrying out pretreatment to enable the surfaces of the polymer microspheres to contain nickel ions, reducing the nickel ions into nickel nanoparticles, activating the microspheres and carrying out chemical plating. According to the invention, the specific surface area of the conductive microspheres is increased by reducing the nickel nanoparticles on the surfaces of the microspheres, a large amount of impurities cannot be generated among the microspheres, and adhesion among the microspheres can be effectively prevented. According to the prepared conductive microspheres, the plating layer and the polystyrene microspheres are firmly combined, and the risk that the conductivity is reduced due to the fact that the surface of the plating layer falls off is reduced. The preparation method is safe, environment-friendly, simple, convenient and suitable for industrial production requirements.

The invention discloses an alkaline electrolyzed water diaphragm based on nickel oxyhydroxide and a preparation method and application of the alkaline electrolyzed water diaphragm, and relates to the technical field of composite diaphragms.The alkaline electrolyzed water diaphragm is prepared through a phase inversion method, and nanometer nickel oxyhydroxide NiOOH particles are selected as inorganic nanometer filler; the mass percent of the nickel oxyhydroxide in the membrane casting solution is 15-30%. A strong chemical bond formed by nickel ions and hydroxyl in the hydroxyl nickel oxide crystal endows the material with excellent structural stability, and the material shows excellent solubility resistance, hydrolysis resistance and structural collapse resistance in a strong alkaline electrolysis environment and can tolerate high-concentration OH <-> erosion for a long time; meanwhile, the intrinsic high-oxidation-resistance characteristic is achieved.

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 provides a preparation method of an octene aldehyde liquid-phase hydrogenation catalyst, and steps of the method comprise the following: (1) preparing a salt solution containing nickel ions, copper ions and aluminum ions, heating to 40-80 DEG C, adding a basic precipitator to react, and aging after the reaction is completed; (2) uniformly mixing the precipitate obtained after aging in step (1) with silica sol to obtain slurry; (3) washing and filtering the slurry, then adding alkali metal carbonate powder and boron nitride solid, uniformly mixing, and then shaping, drying and calcining to obtain the octene aldehyde liquid-phase hydrogenation catalyst. The preparation method is simple, green, environmentally friendly and easy to industrialize, the conversion rate and selectivity of the obtained octene aldehyde liquid-phase hydrogenation catalyst are high, and the catalyst is stable in performance and durable.

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a method for separating nickel and cobalt from a nickel-containing solution and preparing nickel salt, which comprises the following steps: 1) chelating and precipitating impurity metal ions in the nickel-containing solution by using ammonium polyphosphate with the polymerization degree of more than 1000 as an impurity removal agent, thereby removing copper, iron, zinc and aluminum to obtain an impurity-removed solution; 2) extracting the impurity-removed solution by using a diluent, alpha-hydroxyoxime, carboxylic acid and alkyl alcohol as an extraction organic phase to obtain a nickel-loaded organic phase; 3) washing the nickel-loaded organic phase by using nickel-containing washing water; and (4) reverse extraction is conducted on the washed nickel-loaded organic phase through reverse extraction liquid containing acid and nickel ions, nickel-rich liquid is obtained after reverse extraction is completed, nickel salt in the nickel-rich liquid is crystallized, and nickel salt solids are obtained after phase separation. According to the method, nickel is selectively extracted through the compound extraction system after impurity removal, the extraction rate of nickel reaches up to 99.8%, nickel is separated from metal ions such as cobalt and lithium, and the method is simple in process, low in equipment manufacturing cost and low in manufacturing cost.

The invention discloses a hollow carbon sphere loaded Ni / NiO heterojunction material, which is prepared by the following steps: firstly preparing a solid carbon sphere loaded Ni / NiO heterojunction material SiO2-NC-Ni / NiO by a template sacrifice method, and then removing a SiO2 template by an alkaline etching method to obtain the hollow carbon sphere loaded Ni / NiO heterojunction material NC-Ni / NiO. The preparation method comprises the following steps: 1, preparing PDA coated silicon dioxide solid spheres; 2, preparing PDA coated silicon dioxide solid sphere loaded nickel ions; 3, preparing a carbon-coated silicon dioxide solid sphere loaded nickel-nickel oxide heterojunction; and 4, preparing the hollow carbon sphere loaded nickel-nickel oxide heterojunction. The invention relates to a preparation method of an NC-Ni / NiO doped lithium aluminum hydride hydrogen storage material, which comprises the following steps of: mixing NC-Ni / NiO serving as a catalyst and lithium aluminum hydride under an argon condition, and performing ball milling to obtain LiAlH4-NC-Ni / NiO. When the material is used as a hydrogen storage material, the initial dehydrogenation temperature is 60-70 DEG C, and the hydrogen desorption amount is 7.0-7.2 wt.%.

The invention belongs to the technical field of electroplating wastewater treatment, and particularly relates to acidic electroplating wastewater treatment equipment and process based on combination of Fenton oxidation and acid-resistant nanofiltration membrane separation. Considering that the acidic nickel plating wastewater not only can provide acidic conditions, but also has ferrous ions, based on this, the acidic nickel plating wastewater is used as a raw material and is mixed with the ferrous ions and hydrogen peroxide for a Fenton reaction, and then iron ions and nickel ions are separated by adopting a PP precision filter and an anti-high-turbidity ultrafiltration system. According to the method, iron ions are recycled after being reduced by an iron reduction reactor, nickel ions are separated by adopting an acid-resistant nanofiltration system, and the obtained nickel ions are subjected to electroplating and water recycling again, so that the technical defects existing in the traditional nickel plating wastewater treatment are overcome, and the utilization of the acidic nickel plating wastewater is realized.

The invention relates to the technical field of battery management, in particular to a sodium nickel chloride battery pack balanced charging and discharging control method based on an intelligent algorithm. The method comprises the steps of obtaining working parameters of each single battery of a battery pack and controlling the temperature to a preset range; detecting sodium and nickel ion concentration parameters of each single battery, calculating a sodium ion transmission rate, and determining a charge-discharge rate parameter; and calculating a state-of-charge value and a state-of-health value based on the working parameters and the rate parameters, and determining charging and discharging time and strategies, thereby realizing balanced charging and discharging of the battery pack. The method can improve the charge-discharge efficiency of the sodium nickel chloride battery pack, prolong the service life and ensure the safe and stable operation of the battery pack.

The present application provides a perovskite solar cell, a preparation method, a photovoltaic system, a power generation device, and an electric device. The perovskite solar cell comprises a first electrode, a charge extraction layer, a first passivation layer, a perovskite layer, and a second electrode which are sequentially stacked. The material of the charge extraction layer comprises a nickel oxide, the material of the first passivation layer comprises a reducing agent, and the reduction potential of the reducing agent is less than that of Ni3+. In the perovskite solar cell, by means of introduction of the first passivation layer, nickel ions with a valence of +3 or higher in the charge extraction layer can be reduced, reducing the degradation of a perovskite material, improving the stability of the perovskite layer, thereby prolonging the service life of the perovskite solar cell.

The invention discloses a device and a method for electrochemically treating chemical nickel plating waste liquid. The device comprises a pH regulating tank, an electrolytic tank, a reaction tank, a sedimentation tank and a clean water tank which are sequentially connected through pipelines, stirring devices are arranged in the pH adjusting tank and the reaction tank; an electrode mechanism and an air stirring coil pipe are arranged in the electrolytic tank, and the air stirring coil pipe is arranged below the electrode mechanism and is connected with the air compressor through a pipeline; the electrode mechanism is electrically connected with the direct-current power supply; an inclined tube filler is arranged in the sedimentation tank; a water flow control valve and a water pump are arranged on a pipeline between every two adjacent pool bodies; the method comprises the steps that under the action of a direct-current electric field, organic pollutants are removed through anode electrooxidation, nickel ions are recycled through cathode electroreduction deposition, and clear water reaching the standard is obtained after chemical treatment and precipitation separation. Under the electrolysis condition of 2-5 h, the nickel ion removal rate reaches 99.9%, the concentration is reduced to be smaller than 1 ppm, COD is remarkably reduced, and efficient purification and resource utilization of the chemical nickel plating waste liquid are achieved.

The invention provides a laser-induced surface metallized glass fiber reinforced polyether-ether-ketone modified material and a preparation method thereof. The laser-induced surface metallized glass fiber reinforced polyether-ether-ketone modified material is prepared from the following components in percentage by weight: 39%-69.5% of PEEK resin, 20%-40% of low-dielectric flat glass fiber, 5%-10% of low-dielectric filler, 5%-10% of Cu-Ni coordination compound and 0.5%-1% of antioxidant. According to the invention, the Cu-Ni coordination compound is added into the PEEK modified material, then the PEEK modified material is subjected to laser induction treatment with a specific wave band, reducing cuprous ions or nickel ions are obtained on the surface layer of the PEEK modified material, and then the reducing cuprous ions or nickel ions are catalytically reduced into metal atoms through an electroplating process, so that the metal layer is embedded into the PEEK base material, and the binding force between the metal coating and the PEEK base material is improved.

The present disclosure relates to double layered hydroxide-type compounds comprising both di- and tri-valent nickel ions, and the use of such compounds in electrodes for energy storage device in addition to a previously developed electrode using Fe2+ and Fe3+“green rusts related compounds”.

The invention discloses a spinel type catalyst for preparing chlorine through electro-catalysis and a preparation method of the spinel type catalyst, and relates to the technical field of electro-catalysis materials. The catalyst is a nickel-doped cobalt spinel oxide, the chemical general formula of the catalyst is NixCo3-xO4, the value range of x is 0.4-0.6, the crystal structure of the catalyst belongs to a cubic system spinel structure, and nickel ions selectively occupy octahedral sites in spinel crystal lattices and partially replace original Co < 3 + > ions. The spinel type non-noble metal catalyst with high chlorine evolution activity, high selectivity and good stability is constructed by accurately controlling the nickel doping concentration and optimizing hydrothermal and annealing process parameters.

This invention relates to the field of electroless plating technology, and more particularly to a low-phosphorus electroless nickel plating solution and a method for nickel plating on an aluminum alloy substrate. The low-phosphorus electroless nickel plating solution comprises the following components by mass concentration: a nickel ion source in the form of Ni... 2+ Calculated as 1.0~5.0 g / L; hypophosphite as H2PO2 ‑ The concentrations are calculated as follows: 20–45 g / L; glycine 5–40 g / L, gluconate 5–60 g / L; polyaspartic acid and / or its salts 0.2–5.0 g / L; pH buffer 2–25 g / L; alkyl glycosides 0.05–1.0 g / L; iodate stabilizer, in IO3... ‑ The concentration is calculated to be 0.2~5.0 mg / L. This invention maintains a high deposition rate and significantly improves the tolerance of by-products in the bath solution under low nickel ion concentration conditions. It is also free of heavy metals and sulfur-containing organic stabilizers, reducing the metal load and environmental risk of the waste liquid. It is suitable for various aluminum alloy matrices treated with double zinc replacement.

The utility model provides nickel-containing wastewater treatment equipment and a nickel-containing wastewater treatment system. The nickel-containing wastewater treatment equipment comprises a primary sedimentation tank, a primary flocculation device, an ozone tower, a secondary flocculation device and a secondary sedimentation tank. And the primary flocculation device is communicated with a water inlet of the primary sedimentation tank. And the ozone tower is communicated with the water outlet of the primary sedimentation tank. And the secondary flocculation device is communicated with the ozone tower. And a water inlet of the secondary sedimentation tank is communicated with the secondary flocculation device. According to the nickel-containing wastewater treatment equipment, for nickel-containing wastewater with complex water quality, the treatment cost can be well reduced, the treatment burden of a biochemical system is relieved, and the oxidation decomplexing stability of nickel ions is ensured.

The application belongs to the technical field of luminescent materials, and particularly relates to a nickel ion doped fluoride near-infrared two-region long-wave luminescent nano probe and a preparation method thereof, wherein the nano probe comprises a fluoride nanocrystal matrix and transition metal nickel ions as a luminescent center, or a core-shell structure nano probe formed by taking the above-mentioned substances as a shell layer and being externally coated with an inert shell layer or a homogenous epitaxial layer. The probe realizes wide-range regulation of an emission peak in a 1300nm to 2150nm near-infrared two-region long-wave band; through core-shell structure design and inert shell layer coating, surface defects are effectively passivated, luminescent quantum efficiency is significantly improved, and particle size is precisely controlled. Through nickel ion doping and crystal field regulation strategies, the application develops a new type of non-lanthanide near-infrared two-region long-wave luminescent material; the application has unique dual-wavelength excitation characteristics and wideband emission characteristics, and has wide application prospects in multi-channel biological detection and imaging analysis.

The invention discloses a nickel-cobalt hydrometallurgy circulation process, and relates to the technical field of hydrometallurgy. On one hand, magnesium sulfate solution wastewater is converted into magnesium salt liquid to replace sodium hydroxide to be saponified with an organic phase, and meanwhile water for a production line can be saved. Carbon dioxide waste gas is recycled, and industrial waste gas resource conversion and reuse are achieved. On the other hand, high-efficiency recovery of cobalt and nickel in the waste liquid is realized by preparing a functional material: a resin filtering membrane with a coordination trap on the surface is formed by virtue of Zn < 2 + > coordination activation, and cobalt and nickel ions in the waste liquid are efficiently captured; the preparation method comprises the following steps: pre-synthesizing a dimethyl glyoxime functional ligand with carboxyl by taking dimethylglyoxime and bromoacetic acid as raw materials, and directly constructing MOF (Metal Organic Framework) with a dimethyl glyoxime group for chelating Ni < 2 + >; the prepared adsorption particles are subjected to secondary adsorption in waste liquid after passing through resin, so that cobalt and nickel ions in the waste liquid reach an extremely high recovery rate. The hydrometallurgy can achieve the effect of neither recovery nor circulation.

The invention relates to a method for electroplating a nickel-zinc alloy on the surface of uranium metal fuel. The method comprises the following steps: removing an oxide layer on the surface of the uranium metal fuel; the uranium metal fuel with the oxide layer removed is placed in a ferric trichloride solution to be etched and activated; and the etched and activated uranium metal fuel serves as a cathode and is placed in an electrolyte containing zinc ions and nickel ions for electroplating, and the nickel-zinc alloy coating is obtained on the surface of the uranium metal fuel. The nickel-zinc alloy coating obtained on the surface of the uranium metal fuel through the method has the advantages of being bright in appearance, low in toxicity, small in hydrogen embrittlement, good in toughness, good in weldability and the like, the surface protection performance and corrosion resistance of the uranium metal fuel are remarkably improved, then the service life of the uranium metal fuel is prolonged, and the safety of the uranium metal fuel is improved; the uranium metal fuel is suitable for being stored and used in severe industrial atmosphere and harsh marine environment, and the method has the advantages of simplified preparation process, high production efficiency and low production cost, so that further development of the uranium metal fuel in the fields of national defense and nuclear energy is promoted.

The application discloses an intermediate processing liquid for an electroless nickel immersion gold (ENIG) production line and a chemical gold preparation method. The intermediate processing liquid is applied between the electroless nickel plating and immersion gold processes, and comprises (a) a pH buffer and a metal ion complexing agent: a total concentration of 50-150 g / L; (b) an adsorptive corrosion inhibitor: a concentration of 0.5-5.0 g / L; (c) a low-foam non-ionic surfactant: a concentration of 0.01-10 g / L; (d) an auxiliary antioxidant: a concentration of 0.5-30 g / L; (e) a dissolving agent: a concentration of 1-50 ml / L; (f) a pH regulator: an appropriate amount, which is added to maintain the pH value of the intermediate processing liquid at 4.0-6.5; and (g) deionized water: a balance, so that the concentrations of the above components reach the set target values; and the intermediate processing liquid has a design use temperature of 20-45 DEG C. The intermediate processing liquid removes residual nickel ions on the board surface and in micropores through strong complex cleaning, and blocks the pollution to the subsequent gold tank; meanwhile, the preferential adsorption of the corrosion inhibitor molecules at the nickel layer grain boundaries forms a controllable molecular-level protective film, effectively adjusts the immersion gold replacement reaction kinetics, and prevents the occurrence of intergranular corrosion (black plate).

This application relates to the field of recovery of metal ion waste liquid, and discloses a system and process for recovering and preparing nickel carbonate. The system includes a reaction kettle, which is connected with an ammonia water pipe, a nickel liquid pipe and an alkali liquid pipe that are introduced into the interior of the reaction kettle; the ammonia water pipe is used to introduce ammonia water into the reaction kettle; the nickel liquid pipe is used to introduce the nickel ion solution obtained from the cation exchange unit into the reaction kettle; the alkali liquid pipe is used to introduce alkali liquid into the reaction kettle. The height of the ammonia water outlet is higher than that of the nickel liquid outlet; the height of the nickel liquid outlet is higher than that of the alkali liquid outlet; during the reaction process, the pH of the liquid material in the reaction kettle is controlled to be not lower than 8 and higher than 9.2. By utilizing the multi-layer concentration distribution orientation of the raw materials, the swelling of liquid bubbles and the overflow of a large amount of foam from the reaction kettle are greatly reduced, protecting the safety of the reaction kettle equipment and ensuring that the raw material liquid can be normally pumped into the reaction kettle. The waste water recovery and treatment can be carried out stably and efficiently for a long time, improving the efficiency of waste water recovery and treatment.

A method for producing mixed metal salts containing manganese ions and at least one of cobalt ions and nickel ions, the method including: an Al removal step of subjecting an acidic solution containing at least manganese ions and aluminum ions, and at least one of cobalt ions and nickel ions, to removal of the aluminum ions by extracting the aluminum ions into a solvent, the acidic solution being obtained by subjecting battery powder of lithium ion batteries to a leaching step; and a precipitation step of neutralizing an extracted residual liquid obtained in the Al removal step under conditions where a pH is less than 10.0, to precipitate mixed metal salts comprising a metal salt of manganese and a metal salt of at least one of cobalt and nickel.

The invention provides a method for removing ferrous iron in a nickel chloride solution through efficient oxidation promotion, belongs to the technical field of purification treatment of chlorination system solutions, and solves the problem that free ferrous iron in the nickel chloride solution cannot be effectively oxidized and converted into ferric iron in the prior art. Controlling the concentration of main metal nickel ions, and adding a corresponding amount of hydrogen peroxide into the nickel chloride solution for stirring according to the content of impurity Fe in the nickel chloride solution; injecting the stirred nickel chloride solution into an electrolytic bath, heating, and raising the temperature of the nickel chloride solution in the bath; and the cathode and the anode in the electrolytic bath are conducted, and the introduced nickel chloride solution is subjected to electrolytic treatment, so that divalent iron in the nickel chloride solution can be converted into trivalent iron. The process flow is simple, the production process is easy to control, the facility equipment investment is low, and the final benefit is remarkable.

The present invention provides a nickel ion metal chelate affinity chromatography medium and a preparation method thereof. The nickel ion metal chelate affinity chromatography medium uses porous dextran gel microspheres as a matrix, and allyl glycidyl ether is bonded to the surface of the dextran gel microspheres. The allyl glycidyl ether is connected to ethylenediaminetetraacetic acid, and the ethylenediaminetetraacetic acid is complexed with nickel ions. The nickel ion metal chelate affinity chromatography medium uses the ethylenediaminetetraacetic acid to bond with allyl glycidyl ether, and the ethylenediaminetetraacetic acid can bind nickel ions. 2+ Carry out complexation and effectively improve the stability of chromatography media.

A nickel electrodeposition composition for via fill or barrier nickel interconnect fabrication comprising: (a) a source of nickel ions; (b) one or more polarizing additives; and (c) one or more depolarizing additives. The nickel electrodeposition composition may include various additives, including suitable acids, surfactants, buffers, and / or stress modifiers to produce bottom-up filling of vias and trenches.

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 treating nickel precipitates in ammonium sulfate solution and belongs to the field of metallurgy and chemical engineering. The method combines free nickel ions into a stable organic nickel complex precipitate by sequentially adopting a combination of pretreatment, ammonium sulfide nickel precipitation, oxidation and complex breaking, and fenammonium nickel solidification, and finally removes the nickel precipitate by simple filtration. The method can effectively prevent the nickel precipitate from dissolving, solves the problem of excessive heavy metal content caused by the dissolution of heavy metal nickel precipitates in ammonium sulfate solution, and makes the salt product of the purified ammonium sulfate solution reach the GB535-1995 superior product quality standard through evaporation and crystallization, thereby improving economic benefits and avoiding environmental pollution, and having high application value.