250 results about "Nickel sulfide" patented technology

The invention belongs to the technical field of metal powder materials, and particularly relates to a method for coating nickel powder with barium titanate, which comprises the following steps: preparing an inner shell of nickel oxide and / or sulfide; dispersing the nickel powder with the inner shell in the dispersion liquid; sequentially adding a barium compound and a titanium compound into the dispersion liquid; the nickel powder with the inner shell and the barium compound and the titanium compound adsorbed on the surface is dried, and the barium compound and the titanium compound on the surface react to form a barium titanate coated outer shell; and dispersing the dried coated powder to form the barium titanate coated nickel powder with the double-shell structure. According to the nickel powder with the double-shell structure prepared by the technical scheme, the co-firing property of the nickel powder and a dielectric material is improved through the barium titanate shell of the outer shell, the combination degree of nickel and the dielectric material can be better improved through the nickel oxide and / or the nickel sulfide of the inner shell, and the dielectric property of the dielectric material is improved. Therefore, the yield of the nickel powder and the dielectric material in the process of preparing the electronic component is improved, and the electrical property of the electronic component is improved.

The invention discloses a foamed nickel loaded cobalt sulfide / nickel sulfide NF-CoS / NiS. The foamed nickel loaded cobalt sulfide / nickel sulfide NF-CoS / NiS is prepared by the following steps: firstly, taking foamed nickel NF as a substrate, loading cobalt hydroxide on the surface of the NF through first electrodeposition, then converting the NF into ZIF-67 through an impregnation method, then vulcanizing through thioacetamide and hydrothermal reaction, and finally loading Ni3S2 nanoparticles through second electrodeposition. The nickel foam loaded cobalt sulfide / nickel sulfide NF-CoS / NiS can be obtained. The preparation method comprises the following steps: 1, preparing foamed nickel electro-deposition cobalt hydroxide; 2, preparation of the foamed nickel loaded cobalt hydroxide / ZIF-67; 3, cobalt hydroxide / cobalt sulfide NF-Co / CoS is loaded on the foamed nickel; and 4, preparation of the foamed nickel loaded cobalt sulfide / nickel sulfide NF-CoSX / Ni3S2. When the material is used as a supercapacitor material, charging and discharging are carried out in a voltage window range of 0-0.5 V, and when the current density is 1mA cm <-2 >, the area specific capacitance is 8-9F cm <-2 >; and when the current density is 10mA cm <-2 >, 70-80% of the initial capacity is still kept after 5000 charge-discharge cycles are carried out.

The invention belongs to the field of mineral flotation, and particularly discloses a collecting agent, a flotation reagent and a method for nickel sulfide ore flotation, and the method for nickel sulfide ore flotation comprises the steps that the flotation reagent containing the collecting agent is adopted for conducting flotation on to-be-selected minerals containing nickel sulfide ore, and nickel sulfide concentrate is obtained; the collecting agent comprises at least one of a collecting agent a (# imgabs 0 #), a collecting agent b (# imgabs 1 #) and a collecting agent c (# imgabs 2 #). The collecting agent disclosed by the invention has an excellent collecting effect on the nickel sulfide ore, and can still show excellent collecting capacity especially in the aspect of low-grade nickel sulfide ore.

The invention relates to a nickel sulfide / cadmium sulfide / sulfur-doped graphite-like carbon nitride double-heterojunction composite photocatalyst and a preparation method thereof, and belongs to the technical field of photocatalysis. S-doped g-C3N4 nanosheet powder, nickel chloride hexahydrate, cadmium acetate, thioacetamide, cetyltrimethylammonium bromide and polypyrrole are uniformly mixed in ammonia water; the molar ratio of the nickel chloride hexahydrate to the cadmium acetate to the thioacetamide is (1-5): (1-6): (2-12); the precursor solution is subjected to heat preservation treatment at the temperature of 120-180 DEG C to obtain a reaction solution, precipitates in the reaction solution are washed and then dried, separation and transmission of photogenerated charges are effectively promoted, a rapid charge transfer way is provided for rapid migration of electrons-holes in the catalysis process through a double-heterogeneous interface, and therefore the purpose of accelerating separation of the photogenerated charges is achieved; finally, the photocatalytic hydrogen evolution activity of the g-C3N4 can be obviously improved.

The invention discloses a method for efficiently co-producing benzoquinone and cyclohexanone based on electrochemical oxidation / reduction of phenol, which adopts an acid-base mixed electrochemical electrolytic tank, the anode electrolyte is alkaline electrolyte, the cathode electrolyte is acidic electrolyte, the anode electrode is nickel foam loaded with nickel sulfide-nickel oxide composite nanosheets, and the cathode electrode is nickel foam loaded with nickel sulfide-nickel oxide composite nanosheets. The cathode electrode is a palladium-nickel-boron nanoparticle alloy with nitrogen-doped porous carbon as a carrier, and the anode electrolyte and the cathode electrolyte are separated by a bipolar membrane; the phenol is added into the anolyte and the catholyte, so that the phenol is electrochemically oxidized by the anode to generate an additional product benzoquinone with high economic value, and meanwhile, the phenol is catalyzed by the cathode to be reduced to generate an additional product cyclohexanone with high economic value. The whole system only needs to consume acid and alkali, the method has the advantages of being good in environmental protection effect and considerable in capacity, and the electrochemical electrolytic tank is good in stability, simple in preparation method, low in cost and easy to achieve large-scale production and has the potential to be applied to large-scale treatment of acid and alkali wastewater containing phenol in industry.

The invention relates to the technical field of metal beneficiation, in particular to a separation method for precious metal in low-grade copper-nickel sulfide ore, and solves the problems of low recovery rate and separation efficiency of the precious metal in the low-grade copper-nickel sulfide ore at present. According to the method, ore grinding is carried out through a first ball mill, grading is carried out through a first cyclone after ore grinding, part of graded settled sand is separated out through an ore separation gate and subjected to vibrating screen coarse separation, oversize coarse particle ore of a vibrating screen returns to the first ball mill to be ground again, it is ensured that precious metal in the oversize coarse particle ore is fully dissociated, and undersize fine particle ore is subjected to gravity separation through a Nelson gravity separator; the Nelson concentrate is subjected to ore grinding through a second ball mill, precious metal minerals such as gold and platinum in the Nelson concentrate are subjected to full monomer dissociation, desliming is conducted through a second cyclone after ore grinding, deironing is conducted through a magnetic separator on settled sand, and then the ores are fed into a table concentrator, so that the precious metal concentrate with higher purity is obtained, and precious metal in low-grade raw ore is effectively enriched; and the recovery rate of gold and platinum noble metals is effectively improved.

The invention relates to the technical field of catalysts, in particular to a desulfurization catalyst and application thereof in hydrodesulfurization. The desulfurization catalyst adopts a hollow core shell, a weak acid site is constructed on a shell surface, and a boron-containing polymerization network is formed through surface-initiated polymerization; and linear / branched polyethyleneimine complexation is used for synergistically introducing Ni and Mo, in-situ vulcanization is performed after inert atmosphere pretreatment, and a dispersed nickel molybdenum sulfide active phase and shallow and deep double-peak metal distribution are obtained. The structure inhibits excessive hydrogenation while ensuring diffusion and structural stability, promotes a direct desulfurization path, and shows high conversion and high selectivity to 4, 6-dimethyl dibenzothiophene. The catalyst has low hydrogen consumption, high aromatic hydrocarbon retention and cycling stability, and is suitable for deep desulfurization of diesel oil and preparation of ultralow-sulfur fuel.

The invention relates to a method for efficiently recovering valuable components of complex low-grade platinum-palladium-oxygen-sulfur mixed ore. The method comprises the following steps: (1) pretreating the low-grade platinum-palladium-oxygen-sulfur mixed ore to be treated; (2) carrying out primary enrichment on useful components; (3) secondary enrichment by a pyrogenic process; (4) performing different-structure ore making to obtain different-structure sulfonium ore; (5) separating different ores to obtain alloyed gold, silver-containing copper sulfide concentrate and nickel sulfide cobalt concentrate; (6) separating alloyed gold; and (7) respectively refining by-products copper and nickel. According to the method, the efficient recovery effect on the valuable components of the complex low-grade platinum-palladium-oxygen-sulfur mixed ore is remarkable, the recovery rates of the valuable components such as platinum, palladium, gold, silver, copper and nickel are all 60% or above, the recovery benefits are good, the process is stable, adaptability is high, and the method has important significance on comprehensive utilization of low-grade platinum-palladium ore resources poor in copper and nickel.

The invention provides an ore grinding process for nickel sulfide copper ore with high fine ore content. The process comprises the following steps: firstly, feeding materials in a fine ore bin into a linear vibrating screen; feeding oversize materials of the linear vibrating screen into a first-stage ore grinding process; feeding undersize materials into a second-stage screening high-frequency vibrating screen; feeding oversize materials into a first-stage ore grinding process, feeding oversize materials into a third-stage screening high-frequency vibrating screen, feeding oversize products into a second-stage ore grinding process, and feeding undersize products into a flotation process; according to the method, a pre-screening link is added before first-stage ore grinding, fine-fraction materials meeting the particle size conditions of second-stage ore grinding and flotation feeding are separated out in advance, the situation that the fine-fraction materials enter the mills to cause over-grinding is avoided, and the quality of the fine-fraction materials is improved. In addition, the system treatment capacity is improved, and the ore grinding energy consumption is reduced.

The invention provides a process for comprehensively recovering valuable metals such as nickel, copper, gold, palladium and platinum and sulfur from hot filter residues, which comprises the following steps of: leaching copper, nickel and iron in the hot filter residues by adopting a high-pressure oxygen leaching process, and respectively recovering iron, copper and nickel in forms of ferric hydroxide, copper sulfide and nickel sulfide by adopting a manner of precipitating iron by adopting sodium hydroxide and precipitating copper and nickel by adopting sodium sulfide in a fractional manner; performing triple-effect crystallization on the generated wastewater to obtain pure sodium sulfate, drying leaching residues generated by high-pressure oxygen leaching, performing hot filtration to obtain crude sulfur and primary noble metal enriched residues, and performing low-pressure distillation on the primary noble metal enriched residues in a vacuum furnace to obtain crude sulfur and secondary noble metal enriched residues; and leaching gold, platinum and palladium in the secondary precious metal enrichment slag by adopting a hydrochloric acid chlorine method, returning the leaching slag to a vacuum distillation process, replacing and enriching precious metals in a leaching solution by adopting zinc powder, and carrying out triple-effect crystallization on generated wastewater after a conventional purification process to obtain a zinc chloride crystal product, so that comprehensive recovery of nickel, copper, gold, palladium, platinum and other valuable metals and sulfur is realized.

The present invention belongs to the field of green hydrogen energy, and provides a low-cost catalytic electrode, preparation and application for rapid full electrolysis of seawater to produce hydrogen. The bifunctional catalytic electrode uses a three-dimensional self-supporting foam as a catalyst carrier, and an array of nickel iron sulfide nanosheets is in situ grown on the surface of the carrier as a catalyst. This three-dimensional nanosheet array structure helps to expose more active sites and increase the proton and gas mass transfer rates. The synergistic effect of the bimetallic helps to improve the intrinsic catalytic activity of the electrode. The sulfur anions oxidized on the surface during the catalytic process can inhibit the adsorption of chloride ions on the surface. At the same time, the catalyst raw materials are cheap. The present invention is directly used for the cathode and anode of rapid full electrolysis of seawater to produce hydrogen. It has an industrial-grade current density (500mA cm-2) at a relatively low driving potential (1.85V) in alkaline seawater. ‑2 ), which can be used as a low-cost catalytic electrode for the future rapid all-electrolysis of seawater to produce hydrogen.

A mixture includes a nickel-containing ore and / or concentrate thereof and an extraction composition including a fermentation broth obtained from an Aspergillus species (spp.), Acetobacter spp., Bacillus spp., Propionibacterium spp., Corynebacterium spp., Rhizopus spp., Clostridium spp., Fusobacterium spp., Pseudomonas spp., Bifidobacterium spp., Saccharomyces spp., Enterobacter spp., Escherichia spp., among others. The extraction composition is configured to selectively solubilize one or more components, such as a magnesium component from the nickel-containing ore and / or concentrate thereof. A method for extracting a metal from a nickel-containing ore and / or concentrate includes selectively solubilizing a magnesium component from the nickel-containing ore and / or concentrate thereof into an extraction composition including the fermentation broth. The method can include extracting a magnesium component from a nickel-containing ore and / or concentrate thereof into an extraction composition, separating the nickel-containing ore and / or concentrate thereof from an extracted magnesium component and broth, separating the broth from the extracted magnesium component, and repeating the extracting. The extracted magnesium component has a purity in a range from 10% to 90%.

The invention provides a sulfur-doped keggin type molybdenum polyacid and nickel sulfide heterojunction composite catalyst as well as a preparation method and application of the sulfur-doped keggin type molybdenum polyacid and nickel sulfide heterojunction composite catalyst. The heterojunction composite catalyst is formed by compounding keggin type molybdenum polyacid doped with sulfur and nickel sulfide; the heterostructure of the heterojunction composite catalyst is formed by MoS2 and NiS. The keggin type molybdenum polyacid ([HPMo9O34] 8-) is used as a multi-metal oxygen cluster skeleton, a nickel source is modified and vulcanized synchronously, synthesis of the sulfur-doped keggin type molybdenum polyacid and nickel sulfide heterojunction composite catalyst is realized, the heterojunction composite catalyst has excellent electro-catalytic performance and excellent electrochemical stability, and in an oxygen evolution reaction, the oxygen evolution reaction is performed at the same time, so that the yield of the sulfur-doped keggin type molybdenum polyacid and nickel sulfide heterojunction composite catalyst is increased, and the yield of the sulfur-doped keggin type molybdenum polyacid and nickel sulfide heterojunction composite catalyst is increased. The OER material shows lower overpotential, lower Tafel slope and excellent long-time operation stability, and a practical strategy is provided for developing the OER material with high performance, low cost and corrosion resistance.

Disclosed in the present invention is a method for recovering Mn, Mg, Ni, and Co from laterite-nickel ore tailings. The method comprises the following steps: adding concentrated sulfuric acid to an underflow from thickened laterite-nickel ore tailings for first-stage leaching to obtain a magnesium sulfate solution and tailings with magnesium preliminarily removed; slurrying the tailings with magnesium preliminarily removed and then adding concentrated sulfuric acid and hydrogen peroxide for second-stage leaching to obtain a crude manganese solution; adjusting the pH of the solution to 5-7 to undergo a reaction to remove impurities such as Fe, Al, Sc, and Si from the crude manganese solution, and carrying out pressure filtration to obtain a manganese solution subjected to preliminary impurity removal; and then adding a sulfide for deep impurity removal to remove Ni and Co, and carrying out filtration to obtain a qualified manganese electrolyte solution and cobalt nickel sulfide residue. The present invention creatively proposes a method for recovering Mn, Mg, Ni, and Co from laterite-nickel ore tailings. The recovery process does not need heating and has a small consumption of auxiliary materials, and a low cost. The extracted manganese sulfate solution can completely meet the requirements for electrolytic manganese.

The invention relates to the technical field of electrocatalytic hydrogen evolution, and discloses a preparation method of a sulfur-rich vacancy amorphous nickel sulfide hydrogen evolution electrode. According to the preparation method of the sulfur-rich vacancy amorphous nickel sulfide hydrogen evolution electrode, thiourea, nickel sulfide, hydrochloric acid and sodium borohydride serve as raw materials, the sulfur-rich vacancy amorphous nickel sulfide is grown on the surface of a foamed nickel carrier through a one-step electro-deposition process and sodium borohydride aqueous solution soaking, and the sulfur-rich vacancy amorphous nickel sulfide hydrogen evolution electrode is obtained. The preparation method of the sulfur-rich vacancy amorphous nickel sulfide hydrogen evolution electrode provided by the invention is environment-friendly, convenient and efficient in process, and the prepared sulfur-rich vacancy amorphous nickel sulfide hydrogen evolution electrode has relatively good hydrogen evolution performance under high current density, is fast in charge transfer, adjustable in electronic structure and low in electrochemical process energy barrier, and can be applied to the field of hydrogen evolution. The catalytic performance even exceeds that of some noble metal catalysts.

The invention relates to the technical field of preparation of composite nanowires, in particular to a nickel sulfide titanium dioxide composite nanowire as well as a preparation method and application thereof. The preparation method comprises the following steps: taking a nickel-containing titanium-based nanowire obtained by carrying out ion exchange on a nickel element Na2Ti3O7 nanowire as a raw material; the nickel-containing titanium-based nanowire is mixed with sublimed sulfur, and then the nickel sulfide / titanium dioxide composite nanowire is prepared through a two-step heating process. The nickel sulfide / titanium dioxide composite nanowire obtained through the technical scheme is regular in morphology, and nickel sulfide and titanium dioxide are evenly distributed; adsorption of the lithium-sulfur battery positive electrode carrier to a discharge intermediate product can be effectively enhanced, conversion of the discharge intermediate product is accelerated, the electrochemical performance of the lithium-sulfur battery is improved, and meanwhile, the process for preparing the polar transition metal compound material with the high specific surface area and the high activity is simple, and production is easy.

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 method for surface reconstruction of a ligand-regulated oxygen evolution catalyst, the catalyst and application of the catalyst. The methods involve ligand tuned surface reconstruction capable of simultaneous incorporation of doped cations and oxygen vacancies to improve the catalytic activity of the OER. Surface engineered heterointerface structures consisting of nickel-based precatalysts and (oxy) hydroxides have been developed based on the ligand-induced delayed doping effect using ammonia complexes in alkaline electrolytes by using nickel telluride, nickel oxide, nickel sulfide or nickel selenide as the precatalyst. The method is simple in process, easy to operate and capable of being industrially popularized; and the prepared oxygen evolution catalyst has the characteristics of abundant active sites and oxygen vacancies, large chemical active surface area, good stability, controllability and low cost.

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 invention provides a treatment method for copper nickel oxide ore, and relates to the technical field of metallurgical ore dressing. The method comprises the following steps: S1, ore pretreatment; s2, reducing and vulcanizing the mixture; s3, low-nickel matte blowing; s4, smelted slag is slowly cooled; s5, smelting slag beneficiation; according to the method, part of the copper-nickel oxide ore can be smelted into nickel matte, the other part of the copper-nickel oxide ore is modified into the copper-nickel sulfide ore, nickel-copper metal is recycled in a nickel-copper sulfide phase mode through the flotation technology, and resource utilization of valuable metal is achieved.

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 present application belongs to the field of mineral flotation, and particularly relates to a composite collector, which comprises compound A, compound B and compound C; wherein the compound A is a compound with the structure of formula 1, the compound B is a compound with the structure of formula 2, and the compound C is a sulfide ore collector. The present application also comprises a flotation reagent comprising the composite collector and the application thereof. Researches of the present application show that the composite collector can improve the mineral collecting effect, and particularly for the refractory nickel sulfide ore, the composite collector still has excellent collecting capacity.

The invention belongs to the technical field of new materials, and provides a preparation method of high-yield nickel disulfide (NiS2) or a nickel disulfide / sulfur compound (NiS2 / (x-2) S, 3 < = x < = 8) and an application of NiS2 or NiS2 / S in an electrode material. The preparation method comprises the following steps: mixing a nickel ion (Ni < 2 + >) solution with a sodium disulfide (Na2S2) solution or a sodium polysulfide (Na2Sx, x is greater than or equal to 3 and less than or equal to 8) solution, stirring and reacting for 0.5-12 hours, collecting precipitates obtained by reaction, washing and drying to obtain a NiS2 or NiS2 / (x-2) S (x is greater than or equal to 3 and less than or equal to 8) product. The preparation method is simple and easy to operate, low in cost, high in atom utilization rate, green and environment-friendly, high in safety and capable of realizing large-scale industrial production. And when used as an electrode material for a sodium ion battery, the composite material shows good electrochemical performance.

The invention discloses preparation of a Co9S8 / Ni7S6 heterostructure electrode and preparation and application of a paper-based coplanar miniature supercapacitor, a nickel source, a cobalt source and sodium thiosulfate are uniformly mixed to obtain an electrolyte for deposition, a patterned nickel metal electrode is immersed in the electrolyte for deposition, electro-deposition is performed on one side of the patterned nickel metal electrode by adopting a three-electrode system, and the paper-based coplanar miniature supercapacitor is obtained. And the Co9S8 / Ni7S6 heterostructure positive electrode is obtained. According to the invention, the cobalt-nickel sulfide Co9S8 / Ni7S6 is directly deposited on the current collector through a one-step electrodeposition method, so that the influence of an organic adhesive on an electrode is eliminated, and the binding power is stronger. The paper-based coplanar miniature supercapacitor prepared by using the electrode shows excellent cycling stability and energy density. Even under the folding condition, the capacity of the coplanar miniature supercapacitor is almost kept unchanged, and the coplanar miniature supercapacitor has excellent mechanical stability and practicability.

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 present invention belongs to the technical field of flotation of talc-containing copper-nickel sulfide ore, and discloses a flotation method for preferentially removing magnesium from talc-containing copper-nickel sulfide ore. After the original ore is ground and pulp is adjusted, neutral higher fatty alcohol is added as a talc collector for one roughing and one scavenging process, so as to preferentially float and remove talc to reduce the magnesium oxide content and improve the pulp flotation environment; then the copper-nickel minerals are subjected to two roughing flotation enrichment and separation. The present invention significantly reduces the talc content in the flotation process of copper-nickel sulfide ore, thereby reducing the magnesium oxide content in the copper-nickel concentrate product, can reduce or replace the use of macromolecular inhibitors in the flotation process, reduces the consumption cost of flotation reagents, reduces the mechanical entrainment of gangue minerals in the copper-nickel concentrate product, and thus reduces the influence of slime on the flotation process, which has great significance for the efficient and economical development and utilization of talc-containing copper-nickel ore resources.