95 results about "Nickel sulfide" patented technology

The invention provides a non-destructive glass defect detection and repair method, and relates to the technical field of glass processing. Comprising the following steps: performing vacuum chuck positioning after glass cleaning; a red, blue and white LED light source array is adopted to form a spatial structure light system, interference fringes are generated through light with different wavelengths penetrating glass, and the stress defect and the bubble defect of deeply-buried nickel sulfide residues are detected; an industrial camera is used for photographing to obtain images, and the images are processed and compared to identify defect types and defect positions; bubble defects are repaired by adopting laser fixed-point breakdown and hole filling methods; the method comprises the following steps: firstly, carrying out thermal field crack guide on stress defects, then realizing uniform stress release through temperature and pressure control, and finally, actively expanding cracks in a cold crack manner to break through the glass surface, removing stress impurities and forming glass surface defects which can be filled, and filling the defects to finish repairing. The method has the advantages of no damage to glass and the like.

The invention relates to the field of catalysts, and discloses a nickel sulfide heterojunction rich in lattice distortion and sulfur vacancies and a preparation method and application thereof.The preparation method comprises the steps that a nickel net is inserted into a mixed solution containing Cr salt and terephthalic acid, a hydrothermal reaction is conducted, and a precursor is obtained; and calcining the precursor and sulfur powder in an inert atmosphere to obtain the Cr-doped water electrolysis hydrogen production catalyst. The prepared catalyst has a heterostructure, a large number of S vacancies exist on a heterojunction interface at the same time, lattice distortion occurs, such microstructure defects (including microstrain and atomic vacancies) are beneficial to adsorption and desorption of intermediate products in the electrochemical reaction process, and high-valence Cr (+ 3 and + 6) existing in the catalyst has a good electrochemical reaction effect. The catalytic activity and the stability can be favorably improved.

The invention belongs to the technical field of photocatalysts, and particularly relates to a sulfur nickel selenide cocatalyst, a photocatalyst and a preparation method and application of the sulfur nickel selenide cocatalyst, and the preparation method of the sulfur nickel selenide cocatalyst comprises the steps that a soluble nickel source, a soluble sulfur source and a soluble selenium source are dispersed in an alcohol solvent to be mixed, a reaction is conducted for 10-20 h at the temperature of 160-200 DEG C, and the sulfur nickel selenide is obtained after washing and drying; the molar ratio of the soluble nickel source to the soluble sulfur source to the soluble selenium source is 1: (0.5-1.5): (0.5-1.5). In the cocatalyst, Se is introduced into a NiS2 structure, lattice spacing is increased, a replacement solid solution NiSexS2-x is formed, in the solid solution, Se atoms replace S atoms in an atomic level and enter NiS2 lattices instead of being simply attached to the surface of NiS2 or forming heterojunctions, a single-phase and uniform crystal structure is formed instead of physically mixed two phases, and the structure is stable.

The invention discloses a resourceful treatment method for stainless steel pickling waste liquid and waste water. The waste liquid is divided into high-concentration waste liquid and low-concentration waste liquid according to the acid concentration and the salt concentration to be treated respectively. Sequentially recovering gypsum, chromic hydroxide, nickel sulfide, ferrous hydroxide and manganese-rich slag from the low-concentration waste liquid through gradient precipitation; and neutralizing free acid from the high-concentration waste liquid by using ferrous hydroxide generated in a low-concentration section, cooling and crystallizing to recover ferrous sulfate, deeply removing nickel by using nickel sulfide generated in the low-concentration section, and precipitating to recover chromium hydroxide. In the whole process, generation of ferric iron is strictly controlled, and high-value productization recovery of free acid and all metals is achieved. The method has the advantages of low medicament consumption, high metal recovery rate, high product value, no secondary pollution and the like.

The invention discloses a hollow microsphere with electromagnetic absorption performance and a preparation method and application thereof. Each hollow microsphere structurally comprises a glass hollow microsphere and a metal layer coated on the glass hollow microsphere, and the metal layer is made of nickel; the solid nickel sulfide particles are embedded in the metal layer, and the nickel sulfide particles are at least partially exposed on the outer surface of the metal layer. When being used as a wave-absorbing material (wave-absorbing agent), the hollow microspheres provided by the invention have low density, good structural stability and excellent microwave absorbing and shielding effects.

The invention belongs to the technical field of electrocatalyst preparation, and particularly relates to a metal sulfide-metal double-layer hydroxide heterostructure electrocatalyst as well as a preparation method and application thereof. The method comprises the following specific steps: S1, putting a piece of pretreated foamed nickel into a 0.005 g / mL-0. 015 g / mL thiourea aqueous solution, and sequentially carrying out ultrasonic treatment and heating to obtain nickel sulfide; s2, nickel chloride hexahydrate and cobalt chloride hexahydrate are dissolved in deionized water, thiourea is added, and the mixture is stirred until the mixture is completely dissolved; and performing electrochemical deposition by adopting a three-electrode system to form sulfur-doped cobalt-nickel double-layer hydroxide and nickel sulfide, and then sequentially cleaning and drying to prepare the metal sulfide-metal double-layer hydroxide heterostructure electrocatalyst. The electrocatalyst has the advantages of high performance, low cost, high benefit and the like.

The application discloses a beneficiation method for flotation of copper nickel sulfide ore at different pH values, and relates to the technical field of metal beneficiation, and comprises steps of section grinding and flotation, etc. Different pH values are adopted for stage flotation of the nickel copper sulfide ore, weak alkaline flotation is adopted for the first stage flotation, and easy-floating nickel copper minerals are recovered; the Isa mill is adopted for fine grinding in the second stage, so that fine-grained useful minerals are dissociated, high-concentration weak acid flotation is adopted for the flotation, and difficult-to-select nickel copper minerals are recovered, and the acid-resistant collecting agent and the foaming agent are added, so that the copper nickel recovery rate index is effectively improved.

The application provides a cobalt-nickel sulfide-indium oxide composite nanosheet material, a preparation method and application thereof. The preparation method of the cobalt-nickel sulfide-indium oxide composite nanosheet material comprises the following steps: synthesizing CoNi2S4 nanosheet powder; synthesizing In2O3 nanosheet powder; compounding the CoNi2S4 nanosheet and the In2O3 nanosheet: the CoNi2S4 nanosheet powder and the In2O3 nanosheet powder are fully dispersed in water according to a molar ratio of (1-2):(1:2), are placed in a light-transmitting container, are irradiated with visible light for 1 h, and then are centrifugally separated to obtain a precipitate, are washed with water, and are vacuum dried to obtain the cobalt-nickel sulfide-indium oxide composite nanosheet material. The cobalt-nickel sulfide-indium oxide composite nanosheet material prepared by the method can catalytically reduce carbon dioxide into carbon monoxide and methanol under visible light irradiation, the yield of methanol can reach 129.73 μg·g ‑1 ·h ‑1 , the selectivity and the electronic selectivity of methanol can reach 52.65% and 76.29%, respectively, and the methanol production performance does not show attenuation at least for 30 h.

The invention discloses core-shell structure nickel-copper sulfide, a preparation method thereof and a supercapacitor based on the core-shell structure nickel-copper sulfide, and belongs to the technical field of supercapacitor electrode materials. The method comprises the following steps: uniformly mixing a solution containing nickel ions and copper ions with a ligand to obtain a turbid liquid; carrying out plasma activation treatment on the turbid liquid, carrying out gradient heating and heat preservation, centrifugally collecting precipitates, washing and drying to obtain spherical Ni-Cu bimetal MOF powder; the preparation method comprises the following steps: dissolving spherical Ni-Cu bimetal MOF powder, and dispersing to obtain a precursor suspension; and under an inert atmosphere, injecting a dissolving solution containing thioacetamide and thiourea into the precursor suspension, uniformly mixing, vulcanizing, centrifuging, washing, drying and calcining to obtain the nickel-copper sulfide with the core-shell structure. Experiments prove that the nickel-copper sulfide with the core-shell structure can solve the problems that an existing MOF derivative sulfide electrode material is limited in specific surface area and insufficient in capacitive performance, and a preparation process is prone to causing structural damage.

The invention provides a metallurgical furnace for multi-stage smelting and dilution of copper-nickel sulfide ore, and belongs to the technical field of non-ferrous metal pyrometallurgy equipment. The device is provided with a first-stage space smelting area, a second-stage molten pool smelting area, a third-stage molten pool reduction smelting area and a fourth-stage depletion smelting area which are communicated in sequence; a feeding nozzle and a spray gun are arranged at the top of the first-stage space smelting area to realize material pre-oxidation and impurity volatilization, and a side-blowing spray gun is arranged in the second-stage molten pool smelting area to finish deep smelting and slag-matte separation; a third-stage molten pool reduction smelting area is provided with a spray gun to create a reducing atmosphere, and impurities such as lead and zinc are selectively reduced and volatilized to be removed; a controllable polarity electrode and a sulfuration reducing agent feeding hole are arranged at the top of the fourth-stage depletion smelting area, so that electromagnetic stirring, chemical reduction sulfuration and the like are realized. Through multi-zone collaborative design and functional coupling, the problems that in the existing copper-nickel sulfide ore pyrogenic process, the smelting strength is improved, the adaptability to raw materials is poor, the slag dilution efficiency is low, and impurity valuable metal elements are difficult to enrich are solved.

The invention provides a self-supporting Fe-Ni3S2-coated NiCoLDH core-shell electrocatalyst, a preparation method thereof and a hydrogen production method, and relates to the field of catalysts. The self-supporting Fe-Ni3S2-coated NiCoLDH core-shell electrocatalyst comprises a conductive nickel substrate and a core-shell electrocatalyst arranged on the surface of the conductive nickel substrate, a core in the core-shell electrocatalyst comprises iron-doped nickel sulfide nanosheets, and a shell comprises nickel-cobalt layered double hydroxides. The core and the shell are tightly connected through strong chemical bonding, so that the material keeps structural integrity under a harsh electro-catalysis working condition, and active components are effectively prevented from falling off; the iron-doped nickel sulfide nanosheet with excellent conductivity is used as a natural framework, an efficient electron transmission path is provided for an external nickel-cobalt layered double-metal hydroxide shell layer, the internal resistance of the electrode is remarkably reduced, and reaction kinetics is accelerated.

The invention provides nickel sulfide as well as a preparation method, an electrochemical performance test method and application thereof, and relates to the technical field of electrochemical materials. The method comprises the following steps: adding nickel acetate hexahydrate and thioacetamide into a container, adding ultrapure water into the container, and uniformly stirring to obtain a mixed solution; transferring the mixed solution into a reaction kettle, sealing the reaction kettle, putting the reaction kettle into a drying oven, heating the reaction kettle to a first temperature for a first duration, and carrying out a hydrothermal reaction to generate nickel sulfide; and after the hydrothermal reaction is finished, after the reaction kettle is cooled to room temperature, opening the reaction kettle, and washing nickel sulfide in the reaction kettle to prepare nickel sulfide. According to the method, the concentration in nickel sulfide is accurately controlled by regulating and controlling the hydrothermal reaction time, and the electro-catalytic hydrogen evolution performance is improved, so that the performance of the nickel sulfide electrochemical material is optimized.

The invention discloses a heavy metal emission reduction and sludge reduction treatment process method for circuit board wastewater. The invention provides a layered precipitation strategy of'first acid, second alkali and second sulfur '. The method comprises the following steps: performing acid precipitation on alkaline organic wastewater by using acidic wastewater, and recovering printing ink residues; carrying out air stripping treatment on the copper ammonia wastewater by utilizing an alkaline condition, and precipitating high-purity copper hydroxide; and finally, carrying out deep precipitation on residual complexing heavy metals by utilizing excessive sulfides in the pretreatment stage, and further recovering copper resources in the comprehensive water tank through coprecipitation of copper hydroxide and copper sulfide. Sludge generated in each process is classified and treated; printing ink slag, biochemical residual sludge and copper / nickel sulfide sludge are subjected to synergistic pyrogenic process treatment; copper hydroxide sludge is selectively subjected to acid dissolution to prepare copper sulfate. Lime, ferrous sulfate and polyaluminum are not used in the whole process. According to the method, the medicament is utilized to the maximum extent, the sludge is reduced by 50% or above, and the resource value of valuable metal is increased by 3-5 times.

The invention belongs to the technical field of water electrolysis hydrogen production catalysts, and relates to a preparation method of a high-crystallinity self-supporting nickel sulfide nanosheet, which comprises the following steps: 1, dissolving dimethylglyoxime in absolute ethyl alcohol to form a solution A, and dissolving nickel nitrate hexahydrate in deionized water to form a solution B; 2, mixing and stirring the solution A and the solution B to generate nickel dimethylglyoxime precipitate; 3, centrifugally separating the nickel dimethylglyoxime precipitate, and alternately washing with deionized water and ethanol; 4, the purified nickel dimethylglyoxime is dispersed in a mixed solvent composed of deionized water and ethyl alcohol, and a dispersion system is obtained; 5, adding sodium sulfide into the dispersion system, uniformly mixing, and reacting at a constant temperature; 6, after the constant-temperature reaction is finished, naturally cooling to room temperature, centrifugally separating a solid product, washing with deionized water and ethanol, and carrying out vacuum drying to obtain the nickel sulfide electrocatalyst; the method is simple and easy to operate, and an effective scheme is provided for solving the problem of high cost of a traditional noble metal catalyst in the field of water electrolysis hydrogen production.

The invention provides conductive silver paste special for a glass-based circuit board and a preparation method of the conductive silver paste. The conductive silver paste comprises, by weight, 60-90 parts of silver powder, 4-30 parts of polymer resin, 1.5-5 parts of inorganic filler, 0.05-0.5 part of auxiliaries and 5-20 parts of solvent. The silver powder is spherical and nano silver powder; the glass powder is lead-free glass powder, and the inorganic additive filler is glass powder, indium-tin alloy powder and an expansion coefficient adjusting material (nickel sulfide); the special conductive silver paste for the glass-based circuit board, provided by the invention, has the characteristics of easiness in printing, good solderability by using a lead-free solder after sintering, long service life of a finished product, high and low temperature climate resistance, acid, alkali and salt chemical corrosion resistance, and firm adhesion with a glass substrate without falling after long-term use.

The invention belongs to the technical field of water electrolysis hydrogen production energy conversion, and particularly relates to a porous net-shaped nano nickel sulfide electrocatalyst and a preparation method thereof. The raw materials of the porous reticular nano nickel sulfide electrocatalyst comprise foamed nickel and sulfide of nickel; the foamed nickel is prepared through a slurry hanging method, and used slurry comprises the following components in percentage by mass: 30-40% of nickel powder, 3.0-3.5% of a binder, 0.4-0.45% of a dispersing agent and the balance of water. The porous reticular nano nickel sulfide electrocatalyst is prepared through foamed nickel vulcanization treatment, the surface of the catalyst material is in a nano porous reticular design, the specific surface area is large, the number of active sites is large, and the porous reticular nano nickel sulfide electrocatalyst has the performance advantages of being low in cost and high in activity as a water electrolysis hydrogen evolution catalyst; the water electrolysis hydrogen production equipment designed by using the catalyst can realize the product advantages of low power consumption, high capacity and high efficiency.

The invention discloses a combined reagent for mixed flotation of copper-nickel sulfide ores and application, and belongs to the technical field of mineral flotation reagents. The combined medicament is composed of a component 1 (amine compound) and a component 2 (composite oil phase) which are independently subpackaged, and the component 2 is prepared by compounding sulfur-nitrogen ester, 2 # oil, N, N-dialkyl dithiocarbamate and a nonionic surfactant. Through step-by-step addition of the two components and synergistic compounding of the interior of the component 2, the agent has high collecting performance and good foaming performance, and the recovery rate of pentlandite and chalcopyrite is remarkably increased; meanwhile, the problems that a conventional medicament is easy to crystallize at low temperature and poor in flowability are effectively solved, and the medicament system is simple and low in cost. The method is particularly suitable for bulk flotation of the copper-nickel sulfide ore and has a wide industrial application prospect.

The present application relates to the field of electrocatalytic hydrogen evolution, and discloses a preparation and application of a foam nickel loaded polyacid derived molybdenum nickel sulfide.The present application aims to solve the problems of the prior art, such as the scarcity of raw materials for synthesizing high-performance electrocatalysts, the high overpotential of hydrogen evolution reaction, and the complex preparation method.A foam nickel loaded polyacid derived molybdenum nickel sulfide MoS2 / Ni3S2@NF-MO is designed and developed.The method comprises the following steps: taking foam nickel with in-situ grown NiO nanometer array as a template, and taking synthesized silicomolybdic acid and thiourea as raw materials, and then preparing the foam nickel loaded polyacid derived molybdenum nickel sulfide by a hydrothermal synthesis method.The foam nickel loaded polyacid derived molybdenum nickel sulfide can be applied to an electrocatalytic hydrogen evolution reaction in an alkaline electrolyte, and has low hydrogen evolution overpotential and high catalytic activity.

The invention discloses a method for preparing a nickel solution from high-grade matte nickel, and belongs to the technical field of hydrometallurgy. The method comprises the following steps: carrying out first-time first-stage normal-pressure acid leaching on high nickel matte, a first inorganic acid and a first oxidant, and carrying out solid-liquid separation to obtain first-stage leached residues; performing second-stage normal-pressure acid leaching on the first-stage leaching residues, second inorganic acid and a second oxidizing agent, and performing solid-liquid separation to obtain second-stage leaching residues and second-stage leaching liquid; the second-stage leaching residues and the second-stage leaching liquid are subjected to second-time first-stage normal-pressure acid leaching, solid-liquid separation is conducted, and first-stage leaching open-circuit liquid is obtained; h2S generated in the second-stage normal-pressure acid leaching process is used for conducting copper removal treatment on the first-stage leaching open-circuit liquid. The method is simple in process, convenient to operate, low in production cost and energy consumption and high in metal recovery rate. Alloy phases and sulfides can be leached out through segmented acid leaching, and H2 and H2S gas are escaped in a segmented mode; the method does not need to deeply leach nickel sulfide by means of oxygen pressure, does not need to additionally add an extraction copper removal process, and does not generate residual acid wastewater in the whole process.

The present application provides a method for removing thiosulfate from a nickel sulfate solution preparation process. The method comprises the following steps: a slurrying procedure: slurrying a nickel raw material to obtain a slurry, wherein the nickel raw material comprises at least one of high-grade nickel matte, low-grade nickel matte, nickel ore concentrate, and a nickel sulfide intermediate product; an atmospheric pressure leaching procedure: performing atmospheric pressure acid leaching on the slurry to leach out at least part of the metal nickel from the nickel raw material, to obtain an atmospheric pressure leaching residue and an atmospheric pressure leaching solution; a pressurized leaching procedure: performing pressurized acid leaching on the atmospheric pressure leaching residue to leach out nickel contained in the atmospheric pressure leaching residue, to obtain a pressurized leaching residue and a pressurized leaching solution; and a first recycling procedure: performing a first recycling treatment on the pressurized leaching solution to obtain a recycled solution having a copper ion concentration of 2-40 g / L, and returning the recycled solution to the atmospheric pressure leaching procedure for mixing with the slurry for atmospheric pressure acid leaching. The method provided in embodiments of the present application can effectively separate nickel from impurities such as thiosulfate, thereby obtaining a nickel product having better quality.

The utility model discloses a smelting system. The smelting system sequentially comprises a smelting furnace, a converting furnace, a dilution electric furnace and a reduction electric furnace according to the smelting sequence. Copper-nickel sulfide concentrate, lump coal, oxygen-enriched air and the like are subjected to a smelting reaction in a smelting furnace, generated copper-nickel matte enters a converting furnace for converting through a connector, crude copper or high-nickel matte is produced and sent to a subsequent refining procedure for further treatment, converting slag produced by the converting furnace is subjected to sedimentation treatment through a dilution electric furnace, and then a crude copper product or a nickel matte product and dilution electric furnace slag are obtained; and after the depleted electric furnace slag is treated by a reduction electric furnace, copper-nickel alloy and waste slag can be obtained. According to the equipment, high-copper and low-nickel copper-nickel sulfide concentrate can be treated, and a crude copper product and a copper-nickel alloy are obtained; and high-nickel and low-copper sulphide copper-nickel concentrate can also be treated, and high-nickel matte and copper-nickel alloy products are obtained. The device has the advantages of wide raw material adaptability, high working condition adjusting capability and continuous and stable production.

The application discloses a method and system for comprehensively utilizing high-magnesium nickel sulfide ore by a low-temperature oxygen-rich method. The method comprises the following steps: obtaining pre-leaching residue by pre-leaching and magnesium removal with high-magnesium nickel sulfide ore as raw material; obtaining activated ore slurry by mechanically activating the pre-leaching residue; and obtaining a nickel-containing leaching solution by low-temperature oxygen-rich leaching of the activated ore slurry. The application has wide application range, is simple and reliable, easy to control, and low in investment cost, and can convert metals into corresponding products, so that high-magnesium nickel sulfide concentrate can be treated at low cost and high efficiency.

This invention discloses a transition metal sulfide@wood charcoal self-supporting electrode material, its preparation, and its application. The invention involves carbonizing delignified wood in an inert gas atmosphere to obtain three-dimensional porous conductive wood charcoal; dispersing a nickel and iron source in a solvent to obtain a mixed solution A; subjecting the wood charcoal to a hydrothermal reaction in mixed solution A to obtain wood charcoal loaded with metal double hydroxides; dispersing a molybdenum and sulfur source in a solvent to obtain a mixed solution B; and subjecting the wood charcoal loaded with metal double hydroxides to a hydrothermal reaction in mixed solution B to obtain a wood charcoal electrode loaded with molybdenum sulfide and nickel-iron sulfide nanosheets, which is the transition metal sulfide@wood charcoal self-supporting electrode material. This invention utilizes a simple two-step hydrothermal method to synthesize the transition metal sulfide@wood charcoal self-supporting electrode material, constructing a heterostructure of molybdenum sulfide and nickel-iron sulfide nanosheets, thereby improving electrocatalytic activity and stability.

The invention discloses a copper-nickel sulfide ore two-stage grading method based on cooperation of vertical mill regrinding and a flotation column, and belongs to the technical field of efficient utilization of nonferrous metal mineral resources. The method comprises the following steps: grinding second-section raw ore by a vertical stirring mill, grading by a hydrocyclone, and overflowing into a flotation column for second-section primary roughing and secondary roughing by the hydrocyclone; roughing concentrates are combined and reground and then enter a flotation column to be subjected to second-section primary concentration and secondary concentration, concentrated concentrates are final concentrates, and concentrated middlings are cyclically reselected; roughing tailings enter a flotation machine for second-stage primary scavenging and secondary scavenging, scavenged tailings are final tailings, and scavenged middlings are cyclically re-separated; and primary middlings subjected to fine selection and scavenging are combined and returned to the cyclone for classification. Through the synergistic effect of selective regrinding of the vertical mill and precise separation of the flotation column, over-ground superfine silt is reduced, and the recovery rate of micro-fine particle minerals is increased; a column-machine combined process is adopted, the equipment advantages of a flotation column and a flotation machine are exerted, comprehensive recovery of coarse and fine fraction copper-nickel minerals is achieved, the concentrate grade and the metal recovery rate are improved, and meanwhile energy conservation and consumption reduction in the whole process are achieved.

The invention belongs to the technical field of waste residue recycling, and particularly relates to a method for recycling nickel-copper matte by treating nickel residues through a homologous vulcanizing agent. The method comprises the following steps: mixing nickel slag, limestone, a homologous vulcanizing agent and a reducing agent, heating for reduction vulcanization treatment, and cooling to obtain nickel-copper matte and depleted slag; the homologous vulcanizing agent is nickel dry concentrate, nickel sulfide and pyrite concentrate, copper sulfide and pyrite concentrate, or nickel sulfide, copper sulfide and pyrite concentrate; the mass of the homologous vulcanizing agent accounts for more than 1.5% and 1t of the mass of the nickel slag; and 8.5%. The content of Ni, Cu and Co in the depleted slag obtained through the method is far lower than the content of Ni, Cu and Co in nickel slag, and production indexes are met. The nickel-copper matte is a target product of the invention, has high Ni, Cu and Co contents, and mainly exists in the form of sulfides. According to the method, the recovery rate of valuable metal in the nickel slag is increased, and the obtained nickel-copper matte product can directly enter a nickel smelting process flow or be sold.

The application belongs to the field of materials, and discloses a preparation method of a bifunctional alkaline water electrolysis manganese-doped nickel sulfide / porous nickel foam electrode. The application is prepared by two-step electrodeposition, first activates the nickel foam substrate, and then electrodeposits nickel sulfide on the activated porous nickel foam substrate and dopes manganese. The manganese-doped nickel sulfide nanostructure grown on the porous nickel foam builds an electrode that can be used for bifunctional water electrolysis. The porous structure of the electrode can effectively accelerate the mass transfer process and promote the rapid escape of the bubbles generated by the reaction under high current density. In addition, the doping of manganese optimizes the electronic structure of the nickel sulfide, and the nickel sulfide has the characteristics of enhanced conductivity, increased electrochemical active area, fully exposed active sites, and optimized intermediate adsorption. The preparation method provides an effective strategy for the preparation of high-performance electrodes in actual water electrolysis.

A nickel recovery method according to an embodiment of the present invention is a method for recovering nickel from a nickel matte in sulfide form, the method comprising: a step for pressure-leaching the nickel matte at a pressure higher than atmospheric pressure; a step for neutralizing the pressure-leached liquid produced in the pressure-leaching step; a first solvent extraction step for producing a first extracted liquid containing nickel from the neutralized liquid produced in the neutralization step; and a second solvent extraction step for producing a second extracted liquid containing nickel from the first extracted liquid.

The invention discloses a novel electro-deposition nickel sulfide electrode and application of the novel electro-deposition nickel sulfide electrode as an alkaline electrolysis water electrode. The novel nickel particle modified electrode is an inorganic material. The excellent electrochemical performance of the novel electro-deposition nickel sulfide electrode shows that the novel electro-deposition nickel sulfide electrode has a very large application prospect as an alkaline electrolysis water electrode. Meanwhile, the novel electrodeposition nickel sulfide electrode preparation process is simple and controllable, equipment is simple, and the method is easy for large-scale production.

The invention discloses a graphene oxide / cobalt-nickel sulfide loaded nickel-manganese layered double hydroxide, which is prepared by the following steps: firstly, by taking nickel acetate tetrahydrate, cobalt acetate tetrahydrate, thiourea, ethylene glycol and graphene oxide as raw materials, preparing black graphene oxide loaded cobalt-nickel sulfide rGO / NiCo2S4 (rGO / NCS for short) through a hydrothermal method; then, nickel chloride hexahydrate, manganese chloride tetrahydrate, hexamethylenetetramine and deionized water are used as raw materials, rGO / NCS is used as a carrier, layered hydroxide NiMn-LDH is loaded through a hydrothermal method, and grey green graphene oxide / cobalt nickel sulfide loaded nickel manganese layered double hydroxide rGO / NiCo2S4 / NiMn-LDH is obtained; the microstructure is of a flower-shaped structure, and the size is 1-2 microns. When the material is used as a supercapacitor electrode material, the material is charged and discharged in a range of 0-0.5 V, and when the discharge current density is 1Ag <-1 >, the specific capacitance of rGO / NCS / NiMn-LDH is 1900-2000Fg <-1 >; when the discharge current density is 10 Ag <-1 > and the cycle index is 5000, the capacitance retention rate is 60-70%, and the coulombic efficiency is 90-100%.

The invention belongs to the technical field of catalysts, and provides a sulfur recovery tail gas hydrogenation catalyst and a preparation method thereof, the catalyst comprises a carrier and an active component loaded on the carrier; the active components are molybdenum sulfide, cobalt sulfide and nickel sulfide; the carrier is prepared by mixing and molding aluminum-titanium composite hydroxide, magnesium oxide, a pore-enlarging agent and a binder and then roasting, and the aluminum-titanium composite hydroxide is prepared by adopting a rapid coprecipitation-secondary crystallization method; based on the total weight of the catalyst, the content of the molybdenum sulfide is 5 to 20 wt%, the content of the cobalt sulfide is 1 to 5 wt%, the content of the nickel sulfide is 0.5 to 5 wt%, the content of the aluminum-titanium composite metal oxide is 75 to 90 wt%, and the content of the magnesium oxide is 1 to 10 wt%. The catalyst provided by the invention has the characteristics of high SO2 hydrogenation activity and strong organic sulfur hydrolysis ability, and has good activity stability.