48results about "Nickel halides" patented technology

The invention discloses a method for extracting and recovering metal elements in a lithium battery by using a chlorination method, and belongs to the technical field of lithium battery recovery, the method comprises the following steps: step 1, roasting a lithium battery positive plate to remove organic matters, and stripping to remove aluminum foil to obtain electrode material powder; step 2, placing the electrode material powder on a carrier of a Joule heating device, carrying out thermal shock treatment in a chlorine atmosphere, and heating and chlorinating in stages in the treatment process; step 3, desublimating gas generated after chlorination in each stage; and 4, adding the desublimated solid in each stage into deionized water, mixing, adding a sodium carbonate aqueous solution, collecting the precipitate, washing, and drying to obtain a metal salt product. Based on the characteristics that Joule heat can rapidly heat and accurately control the temperature, by combining the difference between the temperature of chlorination reaction of different metal oxides and the gasification temperature of a chlorinated product, staged gasification desublimation treatment is achieved, different metal chlorides are obtained, and accurate and efficient purification is achieved.

The invention discloses a method for extracting and recovering metal elements in lithium batteries using a chlorination method, which belongs to the technical field of lithium battery recovery. The method comprises the following steps: step 1, calcining the positive electrode sheet of the lithium battery to remove organic matter, and peeling off the aluminum foil to obtain electrode material powder; step 2, placing the electrode material powder on a carrier of a Joule heat device, and performing a thermal shock treatment under a chlorine atmosphere, and the treatment process is staged by stage heating and chlorination; step 3, desublimating the gas generated after chlorination in each stage; step 4, adding the solid after desublimation in each stage to deionized water, adding a sodium carbonate aqueous solution after mixing, collecting the precipitate, washing and drying to obtain a metal salt product. The present invention is based on the characteristics of Joule heat that can heat quickly and accurately control the temperature, combined with the difference in the temperature of the chlorination reaction of different metal oxides and the gasification temperature of the chlorination product, to achieve staged gasification and desublimation treatment, obtain different metal chlorides, and purify accurately and efficiently.

Removing metal from metal-carbon material includes contacting the metal-carbon material with hydrogen chloride, thereby yielding a metal chloride in the gas phase and a solid product comprising carbon. The metal-carbon material and the solid product may both contain elemental carbon. A concentration of metal in the solid product is typically less than 1 wt %.

The present invention relates to novel fluorinated compounds and their preparation methods. The invention also relates to the use of said compounds for the preparation of active materials for fluorine batteries, in particular for fluorine battery anodes, for the preparation of fluorine batteries themselves, as well as said active materials and said batteries per se. The compounds have the following formula (I): AxNiF2(I), in which: A is at least one metal selected from Na, K, Li, Rb, Cs, Mg, Ca, Sr, or Ba; and x is such that 0 < x ≤ 1. (no figure)

The utility model relates to the technical field of cobalt-nickel salt extraction and separation, and discloses an efficient cobalt-nickel salt extraction and separation device which comprises a support, an extraction tank is fixedly connected to the middle of the support, a transverse plate is fixedly connected to the upper portion of the extraction tank, a motor is arranged on the rear side of the outer portion of the transverse plate, and the output end of the motor is fixedly connected with a rotating disc. And a fixed rod is fixedly connected to the outer portion of the rotary disc, the fixed rod is sleeved with a reciprocating rod, guide rings are fixedly connected to the two sides of the outer portion of the transverse plate, the reciprocating rod is slidably connected to the interiors of the two guide rings, and a connecting rod is fixedly connected to the lower portion of the reciprocating rod. According to the extraction tank disclosed by the utility model, in the extraction process, the upper and lower different areas in the extraction tank can be conveniently stirred, uniform distribution of materials in the extraction tank is ensured, contact between cobalt and nickel and a leaching agent can be accelerated, and the extraction efficiency is improved while the reaction rate is improved.

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.

To provide an apparatus and a method for producing an aqueous solution of nickel chloride which can obtain an aqueous solution of nickel chloride from which dissolved chlorine gas has been removed.SOLUTION: There is provided an apparatus AA for producing an aqueous solution of nickel chloride which comprises a dissolution tank 1 in which a first nickel raw material is chlorine leached to obtain an aqueous solution of nickel chloride and an adjustment tank 3 in which the aqueous solution of nickel chloride discharged from the dissolution tank 1 is brought into contact with a second nickel raw material to leach the second nickel raw material with chlorine gas dissolved in the aqueous solution of nickel chloride. Since the chlorine gas dissolved in the aqueous solution of nickel chloride is consumed to leach the second nickel raw material, the chlorine gas can be removed from the aqueous solution of nickel chloride.SELECTED DRAWING: Figure 1

This invention belongs to the field of secondary battery cathode material recycling technology. More specifically, it relates to a plasma-sulfate combined method for recycling ternary battery cathode materials. The specific recycling method of this invention includes: immersing the cathode sheet in the solvent N-methylpyrrolidone, ultrasonically treating it to separate the active material layer on the cathode sheet surface from the current collector aluminum foil, sieving to remove the separated current collector aluminum foil, obtaining the cathode material; transferring the cathode material into a microwave reactor, heating it to 450-500℃ in a nitrogen atmosphere, holding the temperature for 10-20 minutes, cooling, and discharging to obtain pyrolysis material; transferring the pyrolysis material to a plasma chamber, using a reducing gas as plasma, and plasma treating it for 20-30 minutes under conditions of a gas pressure of 50-60 Pa and a radio frequency power of 480-550 W to obtain reduced material; using a compound acid leaching solution as the leaching solution, mixing it with the reduced material, and acid leaching for 45-80 minutes to obtain the leaching solution.

The invention relates to the technical field of preparation of metal compounds, in particular to a preparation method of spherical nickel oxalate, and aims to solve the problems of poor morphology control of spherical nickel oxalate products and low mother liquor utilization rate caused by low sphericity degree, wide particle size distribution and influence of additives on process stability in the conventional preparation process of spherical nickel oxalate. According to the method, by accurately controlling the concentration of the nickel chloride solution, the reaction temperature, the oxalic acid adding mode and the like, the prepared spherical nickel oxalate is regular in morphology and uniform in granularity, the Ni content is larger than or equal to 32%, and the impurity element content is smaller than or equal to 0.007%; meanwhile, the mother liquor treatment process is added, cyclic utilization of the mother liquor is achieved, expensive equipment or additives are not needed, the quality requirement of a high-end nickel-based material for a precursor is greatly met, efficient and stable preparation of spherical nickel oxalate is achieved, meanwhile, the mother liquor utilization rate is increased, and the production cost and environmental protection pressure are effectively reduced; and the requirements on high-performance spherical nickel oxalate in the production of batteries, catalysts and the like are ensured.

The invention relates to the technical field of non-ferrous metal hydrometallurgy, in particular to a nickel chloride solution desulfurization method which comprises the following steps: step 1, deoiling a nickel chloride solution through activated carbon and a cloth bag filter to obtain deoiled liquid; wherein the sulfur content in the nickel chloride solution is 15-25 ppm, the concentration of Ni < 2 + > is 90-110 g / L, and the pH value is 4-4.5; step 2, enabling the oil-removed liquid in the step 1 to enter a resin column according to a specified flow rate in a lower-in and upper-out manner, filling the resin column with resin, and adsorbing and reducing sulfur in the oil-removed liquid, so as to obtain a sulfur-removed nickel chloride solution; according to the method, the sulfur removal process is stable, other impurities are not generated or introduced, stable sulfur removal of the nickel chloride solution can be achieved, and due to the fact that the existence of sulfur in high-precision electronic-grade nickel protoxide directly influences stable operation and the service life of a battery material, liquid sulfur obtained after sulfur removal is conducted through the process is smaller than or equal to 10 ppm, and the sulfur content is smaller than or equal to 10 ppm. And the solution standard for producing a high-precision electronic-grade nickel protoxide product is met.

The invention provides a carbon nanotube-carbon plate loaded transition metal fluoride composite material as well as a preparation method and application thereof, and belongs to the technical field of electrode materials. The prepared imidazole metal organic framework compound and N-acetylglucosamine are subjected to segmented heat treatment and carbonization under the protection of a fluorine source and inert gas, and the prepared composite material has a one-dimensional-two-dimensional structure; the one-dimensional carbon tube can provide a sulfur storage space, and the two-dimensional carbon plate can provide more adsorption sites and a conductive network; the transition metal fluoride can serve as a catalytic activity center and can effectively catalyze conversion of polysulfide, the composite material serves as a lithium-sulfur battery positive electrode sulfur carrier, excellent lithium-sulfur battery performance can be obtained, and the preparation method is simple.

The present invention provides a process for preparing a nickel oxide, said nickel oxide comprising nickel and at least one of cobalt and manganese, said process comprising the steps of: i. extracting nickel and at least one of cobalt and manganese form a feed solution; ii. stripping an obtained organic phase with hydrochloric acid, thereby obtaining an aqueous solution comprising, respectively, nickel chloride, cobalt chloride and / or manganese chloride; iii. mixing nickel chloride and at least one of cobalt chloride and manganese chloride obtained in step ii. in a predetermined ratio; iv. hydropyrolysis of the aqueous solution formed in step iii. to afford a nickel oxide comprising nickel and at least one of cobalt and manganese, and gaseous hydrochloric acid; v. separating the gaseous hydrochloric acid formed in step iv. from said nickel oxide formed in step iv.; and vi. recycling the gaseous hydrochloric acid obtained in step v. upstream of said hydropyrolysis in step iv.

The invention discloses a method for producing high-quality nickel chloride from a nickel carbonate raw material, and relates to the technical field of nickel salt wet smelting. The method comprises the following specific steps: slurrying nickel carbonate and nickel chloride mother liquor, dissolving with hydrochloric acid under normal pressure, and then carrying out N235 extraction impurity removal, oil removal, lead removal, evaporation, crystallization, centrifugation, drying and other procedures to obtain high-quality nickel chloride. The high-quality nickel chloride product is obtained by controlling the temperature and pH of normal-pressure dissolution and controlling the extraction agent and the extraction flow ratio in the extraction and impurity removal process, Ni is larger than or equal to 24%, Co is smaller than or equal to 0.001%, Cu is smaller than or equal to 0.0001%, Fe is smaller than or equal to 0.001%, Pb is smaller than or equal to 0.0008%, Zn is smaller than or equal to 0.0001%, Ca is smaller than or equal to 0.026%, Mg is smaller than or equal to 0.02%, Na is smaller than or equal to 0.27%, water insoluble matter is smaller than or equal to 0.005%, and the product quality meets the requirements of GB / T 26522-2011 refined nickel chloride first-grade products. The method has the advantages of being short in technological process, high in leaching efficiency, short in time, easy to filter, low in energy consumption, convenient for industrial production and the like.

The invention belongs to the technical field of environmental protection and resource recycling, and discloses a preparation method, an application method, a regeneration method and a recovery method of a Ni-doped defect WS2 catalyst. The preparation method comprises the following steps: dissolving a molecular sieve, nickel salt, tungstate, a vulcanizing agent, inorganic hydroxylamine hydrochloride and an organic modifier in deionized water, adding organic acid, and carrying out a hydrothermal reaction for a certain time; after the reaction is finished, naturally cooling to room temperature, and carrying out suction filtration, washing and drying to obtain a solid product; and putting the solid product into a photo-thermal catalytic reaction instrument for H2 reduction to obtain the Ni-doped defect WS2 catalyst. The metal components and the carrier of the prepared catalyst have appropriate effects, the catalyst has high hydrodesulfurization activity and stability, the catalyst with reduced desulfurization efficiency is regenerated through hydrogenation reduction, and valuable metals in the waste hydrodesulfurization catalyst are subjected to resource utilization.

The utility model discloses a water bath heating device for preparing high-purity nickel chloride, and relates to the technical field of preparation of high-purity nickel chloride. The water bath device comprises a water bath barrel, a rack connected with the surface side of the water bath barrel is fixed on the surface side wall of the baffle plate; a mounting ring is fixed on the inner side wall of the water bath barrel; a filter screen is arranged on the upper end surface of the mounting ring; a heater is fixed on the surface side wall of the placing plate; and a tooth block meshed with the rack is fixed at the end part of the rotating block. The end opening of the water bath barrel is blocked through the baffle, so that hot air flowing is reduced, the water bath heating efficiency is improved, meanwhile, dirt separation is achieved through the filter screen, and nickel chloride on the containing plate can be rapidly taken and used conveniently through the tooth block and the rack.

A positive electrode active material inhibiting a decrease in discharge capacity due to charge and discharge cycles and a secondary battery including the positive electrode active material are provided. Alternatively, a secondary battery with a high level of safety is provided. The secondary battery includes a positive electrode containing a positive electrode active material, a negative electrode, and an electrolyte. The positive electrode active material is formed by a first step of mixing a composite oxide containing lithium, cobalt, and oxygen, a magnesium source, and a nickel source to form a mixture and a second step of heating the mixture. The nickel source is nickel fluoride. Magnesium, nickel, and fluorine are segregated on the surface of the composite oxide.

The invention relates to a method for treating nickel-containing waste residues generated by nitrogen trifluoride electrolysis. The method comprises the following steps: crushing fluorine-containing nickel residues into solid powder; dissolving the fluorine-containing nickel slag solid powder by using an oxidizing solution, controlling the temperature to be 30-60 DEG C and the pH to be 3.5-5, and stirring until the fluorine-containing nickel slag is completely dissolved, so as to obtain a mixed turbid liquid a containing nickel fluoride, ammonium bifluoride and ferric hydroxide; filtering to obtain ferric hydroxide precipitate and a mixed solution b; adjusting the pH value of the mixed solution b to 7-9 by using a sodium hydroxide solution, and filtering to obtain a nickel fluoride solid and a mixed solution c; heating and concentrating the mixed solution c, and cooling and crystallizing to obtain a sodium fluoride crystal and an ammonium fluoride solution; and evaporating the ammonium fluoride solution to dryness to obtain ammonium fluoride crystals. According to the method, comprehensive recycling of the nickel-containing waste residues generated in the nitrogen trifluoride electrolysis process is achieved, the main nickel element is recycled, and it is ensured that other valuable elements such as fluorine and ammonium in the waste residues are effectively extracted and reused.

The invention belongs to the technical field of secondary battery positive electrode material recovery. The invention relates to a recycling method, in particular to a method for recycling a ternary battery positive electrode material by combining plasma with sulfate. The specific recovery method of the product comprises the following steps: soaking a positive pole piece in a solvent N-methyl pyrrolidone, carrying out ultrasonic treatment to separate a surface active material layer of the positive pole piece from a current collector aluminum foil, and screening to remove the separated current collector aluminum foil to obtain a positive pole material; transferring the positive electrode material into a microwave reactor, carrying out microwave heating to 450-500 DEG C in a nitrogen atmosphere, carrying out a heat preservation reaction for 10-20 min, cooling, and discharging to obtain a pyrolysis material; transferring the pyrolysis material to a plasma chamber, and carrying out plasma treatment for 20-30 minutes under the conditions that the air pressure is 50-60 Pa and the radio frequency power is 480-550 W by taking reducing gas as plasma, so as to obtain a reduction material; and the compound acid leaching solution serves as a leaching solution and is mixed with the reduction material, then acid leaching reaction is conducted for 45-80 min, and the leaching solution is obtained.

The invention relates to the technical field of sodium ion batteries, in particular to a preparation method of a sodium-nickel fluoride battery positive electrode material, the positive electrode material, a battery positive electrode and a battery. The preparation method of the sodium-nickel fluoride battery positive electrode material comprises the following steps: in the presence of a precipitator, carrying out a co-precipitation reaction on nickel fluoride and a sodium source in a solvent to obtain a precipitate; and drying the precipitate, and sintering in a nitrogen atmosphere to obtain the sodium-nickel fluoride battery positive electrode material. According to the sodium-nickel fluoride battery, by optimizing the preparation process of the positive electrode material, the internal resistance is remarkably reduced, the rate capability is improved, and the sodium-nickel fluoride battery can stably work in high-power application.

Compositions suitable for reversibly storing heat in thermal energy systems (TES) include a salt hydrate represented by the formula: MXq·nH2O. M is a cation selected from Groups 1 to 14 of the IUPAC Periodic Table, X is a halide of Group 17, q ranges from 1 to 4, and n ranges from 1 to 12. The cation (M) may have an electronegativity of ≤ about 1.8 and a molar mass ≤ about 28 g / mol. The anion (X) may have an electronegativity of ≥about 2.9 to ≤ about 3.2. A distance between a cation (M) and coordinating water molecules (H2O) is ≤ about 2.1 Å. Thermal energy systems (TES) incorporating such compositions are also provided that are configured to reversibly store heat in the thermal energy system (TES) via an endothermic dehydration reaction and to release heat in in the thermal energy system (TES) via an exothermic hydration reaction.

To provide a method for producing anhydrous nickel chloride powder having a particle size distribution suitable for producing nickel fine powder without pulverization after production by adjusting the particle size in a process for heating nickel chloride hydrate.SOLUTION: There is provided a method for producing anhydrous nickel chloride powder comprising a step of obtaining anhydrous nickel chloride powder by heating nickel chloride hydrate. In the step of obtaining anhydrous nickel chloride powder, the pressure is controlled to 80 torr or less and to a saturated water vapor pressure or less at the product temperature of nickel chloride hydrate until the product temperature of nickel chloride hydrate reaches 65°C or nickel chloride hexahydrate becomes nickel chloride dihydrate while vibrating the nickel chloride hydrate.SELECTED DRAWING: Figure 1

The present invention belongs to the technical field of hydrometallurgical generation of anhydrous nickel fluoride, and specifically relates to a method for preparing anhydrous nickel fluoride, wherein the preparation method uses nickel salt and ammonium hydrogen fluoride as raw materials, and obtains anhydrous nickel fluoride through four steps of liquid phase synthesis, filtration and washing, drying and grinding, and high temperature de-crystallization water. Compared with the prior art, the method for preparing anhydrous nickel fluoride provided by the present invention has the advantages of high safety, low equipment requirements, low production energy consumption, simple operation, good product batch stability, high purity, etc.

The invention discloses a preparation method of fluorine-doped nickel oxide nano-particles, and relates to the technical field of solar cells, and the preparation method specifically comprises the following steps: preparing a fluorine-doped nickel oxide precursor by adopting a coprecipitation method, drying by combining a vacuum freeze drying technology, grinding, and calcining at 270 DEG C to finally obtain the fluorine-doped nickel oxide nano-particles. According to the method, a fluorine element is introduced as a lattice doping agent, the inherent low conductivity problem is fundamentally solved, and experimental results show that compared with undoped nickel oxide, the obtained fluorine-doped nickel oxide material has more excellent conductivity, hole extraction efficiency and electron transmission performance, the photoelectric performance of a perovskite solar cell can be remarkably improved, and the performance of the perovskite solar cell is improved. And a new material basis is provided for the application of the material in the field of photoelectric devices.

The invention relates to the field of alloy separation and resource utilization, and provides a method for preparing nickel chloride from a nickel-iron alloy. The method comprises the following steps: contacting the ferro-nickel alloy with chlorine gas and auxiliary agent gas, and carrying out chloridizing roasting to obtain a volatile gas phase; wherein the molar ratio of the chlorine element of the chlorine to the nickel element in the nickel-iron alloy is (2-6): 1, the auxiliary gas at least comprises oxygen, and the molar ratio of the total amount of the oxygen element in the auxiliary gas to the iron element in the nickel-iron alloy is (1.6-2): 1; the temperature of the chloridizing roasting is 750 to 1000 DEG C; and collecting the volatile gas phase, and cooling to obtain nickel chloride. According to the method, chlorine is selectively chlorinated, nickel chloride is directly separated, and iron does not need to be chlorinated in the reaction, so that the use amount of chlorine is reduced. Moreover, nickel chloride is separated in the form of gas, the nickel element is easy and convenient to recycle, the purity is high, and recycling of the nickel element is facilitated.

The present invention provides a method and device for separating nickel and iron from a nickel-iron alloy. The method comprises the following steps: roasting the nickel-iron alloy in a chlorine-containing atmosphere to obtain a roasting residue and an iron- and nickel-containing vapor phase, wherein the roasting temperature is 900-1200°C, and the roasting duration is 60-180 min; performing multi-stage condensation on the iron- and nickel-containing vapor phase, and collecting a solid phase obtained from first-stage condensation to obtain a nickel chloride product; and collecting a solid phase obtained from second-stage condensation to obtain an iron chloride product, wherein the second-stage condensation follows the first-stage condensation, and the condensation temperature of the second-stage condensation is 100-200°C. In the method for separating nickel and iron from a nickel-iron alloy, during roasting, highly selective volatilization of iron and nickel is achieved by controlling the roasting temperature and the roasting atmosphere, while impurities retain in the residue. Subsequently, by performing staged temperature-controlled condensation on the vapor phase obtained by roasting, high-purity nickel chloride and iron chloride products can be obtained separately.

The present invention relates to a method of forming a cured conductive binder material, to a method of forming a curable binder formulation, to a curable binder formulation, to a cured conductive binder material and to an electrochemical cell. In one embodiment, the method of forming a cured conductive binder material includes the steps of: (i) providing a liquid formulation comprising a liquid carrier, at least one active material, at least one polymeric binder and at least one modified metal coordination complex; and (ii) curing the liquid formulation of step (i), to thereby form a cured conductive binder material.

The application relates to a preparation process of anhydrous nickel fluoride, which comprises the following steps: S1, pretreatment: providing nickel-containing fluorine etching waste liquid, and adjusting the pH value by adopting lye; S2, heat preservation and stirring: in the process of adjusting the pH value in step S1, the reaction temperature is controlled to be kept at 30-50 DEG C and stirring is carried out; S3, standing and aging: the liquid after the reaction in step S2 is subjected to standing and aging; S4, centrifugal separation: the liquid after the aging in step S3 is subjected to solid-liquid separation, and nickel fluoride wet material containing free water is obtained; S5, drying: the nickel fluoride wet material containing free water prepared in step S4 is dried by adopting a cyclone separator, and nickel fluoride products are obtained; wherein, the lye in step S1 is ammonia water, and the ammonia water is added in a step-by-step manner, and the proportion of the ammonia water mass added in each step in the total mass of the ammonia water is gradually increased. The application creates a dynamic reaction environment capable of effectively inhibiting the generation of hydrogen bonds by adjusting the pH value and controlling the temperature and stirring in a low-temperature range, and greatly improves the nickel content and yield of the products.

To provide a dissolving tank capable of enhancing efficiency of a chlorine leaching reaction of a nickel raw material and a method for manufacturing an aqueous solution of nickel chloride.SOLUTION: A dissolving tank 1 includes a tank main body 10, a screen plate 15 provided inside the tank main body 10 and on which a nickel raw material N is placed, an injection part 21 that sprays a liquid on the nickel raw material N, a chlorine gas supply tube 52 that supplies the chlorine gas to inside of the tank main body 10, and a drain port 18 provided below the screen plate 15 to discharge the generated nickel chloride aqueous solution by overflow. Since the nickel raw material N is covered with a liquid film under a chlorine gas atmosphere, the chlorine gas is easily absorbed into the liquid, and the chlorine leaching reaction of the nickel raw material N is likely to proceed. Therefore, a nickel chloride aqueous solution can be generated with high efficiency.SELECTED DRAWING: Figure 1

Layered electrode materials, positive electrodes, rechargeable zinc batteries, and methods are provided. A layered electrode material for use in a rechargeable zinc battery includes a plurality of active metal slab layers in a layered configuration. The active metal slab layer includes a plurality of redox active metal centers and a closely-packed anionic sublattice. A plurality of interlamellar spaces separate adjacent active metal slab layers in the layered configuration. The interlamellar space includes at least one pillar species. The layered electrode material has a combined average metal oxidation state in a range of +3 to +4 in an initial charged state. The layered electrode material accepts solvated zinc cations via intercalation into the interlamellar space upon reduction.

The present invention provides a process for preparing a nickel oxide, said nickel oxide comprising nickel and at least one of cobalt and manganese, said process comprising the steps of: i. extracting nickel and at least one of cobalt and manganese form a feed solution; ii. stripping an obtained organic phase with hydrochloric acid, thereby obtaining an aqueous solution comprising, respectively, nickel chloride, cobalt chloride and / or manganese chloride; iii. mixing nickel chloride and at least one of cobalt chloride and manganese chloride obtained in step ii. in a predetermined ratio; iv. hydropyrolysis of the aqueous solution formed in step iii. to afford a nickel oxide comprising nickel and at least one of cobalt and manganese, and gaseous hydrochloric acid; v. separating the gaseous hydrochloric acid formed in step iv. from said nickel oxide formed in step iv.; and vi. recycling the gaseous hydrochloric acid obtained in step v. upstream of said hydropyrolysis in step iv.