63 results about "Nickel sulphide" patented technology

The invention relates to a nickel disulfide carbon nano composite material and a preparation method and an application thereof, wherein the composite material is formed by coating a nickel disulfide nanosheet with a carbon layer. The preparation method comprises the following steps of preparing a nickel hydroxide nanosheet precursor by a hydrothermal method, performing magnetic stirring and dispersing in deionized water to obtain a uniform dispersion liquid of the nickel hydroxide nanosheet precursor, adding a buffering agent tris(hydroxymethyl) aminomethane hydrochloride, and adjusting the pHvalue to be 8.5 by adopting an alkali solution with the pH value of 13, adding dopamine hydrochloride, and magnetically stirring at room temperature for in-situ polymerization, and carrying out washing and centrifugally drying to obtain a nickel hydroxide nanosheet precursor / polydopamine composite material, and carrying out heat treatment and vulcanization with sublimed sulfur powder in a tubularfurnace in nitrogen atmosphere at a certain temperature to obtain the composite material. The preparation process is simple, easy to operate, green and non-toxic and friendly in material preparationprocess; and the prepared nickel disulfide carbon nano composite material is stable in structure, uniform in morphology and high in dispersion. The obtained nickel disulfide carbon nano composite material can be an ideal electrode material of a high-performance lithium ion battery, a supercapacitor and other new energy devices.

The invention discloses a method for preparing a hollow ball of sulfide and oxide of nickel. The method comprises the following steps: (1), adopting ultrasonic or mechanical stirring to disperse nickel nitrate, L-cysteine and urea uniformly in deionized water; (2), transferring the mixed liquid into a reaction kettle, and reacting for 8 to 48 hours at a temperature of 140 DEG C to obtain a nickel disulphide hollow ball; (3), calcinating nickel disulphide at different temperatures to obtain hollow balls of nickel monosulfide and nickel oxide respectively; and (4), under hydrothermal condition, reacting nickel disulphide with selenium source and tellurium source respectively for 4 to 48 hours at a temperature of 140 DEG C to obtain hollow balls of nickel diselenide and nickel telluride. According to the method, raw materials are cheap, easy to obtain, and convenient to compound; the required devices are simple; no pollution is caused in the production process; and the large scale production can be realized rapidly.

The invention belongs to the technical field of nanomaterial, and specifically discloses a nickel sulfide nanoparticle / nitrogen-doped fiber-based carbon aerogel composite material and a preparation method therefor. The composite material is prepared by the steps of adopting nickel salt and a sulfur source, and performing in-situ growth of the nickel sulfide nanoparticles on the nitrogen-doped cellulose-based carbon aerogel; the raw materials comprise a biomass material rich in fibers, nickel salt, thiocarbamide, dopamine and aniline monomer; the preparation process comprises the steps of preparing a poly-dopamine-coated fiber-based biomass material or a polyaniline-coated cellulose-based biomass material through a one-step polymerization method; preparing the nitrogen-doped cellulose-based carbon aerogel through a high temperature carbonization method; and performing in-situ growth of the nickel sulfide nanoparticles on the surface of the nitrogen-doped fiber-based carbon aerogel by adopting a one-step solvothermal method. The composite material prepared by the invention has the uniform distribution characteristic of the nickel sulfide nanoparticles on the nitrogen-doped fiber-based carbon aerogel, so that the composite material can be used as the ideal supercapacitor electrode material.

The invention discloses an application method of binary metal sulfides in a chargeable magnesium battery. The binary metal sulfides comprise nickel sulfide, manganese sulfide, cobalt sulfide, ferric sulfide, tin sulfide, tungsten sulfide, zinc sulfide, vanadic sulfide and the like. The preparation method for preparing the chargeable magnesium battery with the binary metal sulfides as an anode material specifically comprises the steps of: grinding the binary metal sulfides; adding a conductive agent and a bonding agent into the binary metal sulfides, and agitating uniformly and coating on a current collector; placing the current collector in an oven to dry, punching into a pole piece by a punch, tabletting and placing into a vacuum oven to dry so as to obtain the anode material; and using magnesium as a cathode, adding an electrolyte and assembling the chargeable magnesium battery. The chargeable magnesium battery prepared by the method provided by the invention has the advantages of simpleness in preparation, abundance in materials, low cost, and easiness in mass production. The chargeable magnesium battery has a great advantage as a large energy storing battery and has a good application prospect as a green energy resource.

The invention belongs to a method for beneficiating copper / cobalt / nickel mine and specifically relates to a method for beneficiating ion-state copper / cobalt / nickel mine of ore; copper ore containing a plenty of ion-state copper / cobalt / nickel in raw ore is beneficiated except copper / cobalt / nickel sulphide; copper / cobalt / nickel sulphide mine can be recycled in a conventional beneficiating and floating method; and the ion-state copper / cobalt / nickel cannot be recycled and is lost in gangue along with the emission of floated gangue. According to the invention, regulating agent and precipitator are added to gangue pulp in a stirring manner after floating the copper / cobalt / nickel sulphide mine; the ion-state copper / cobalt-nickel in mine pulp is reacted with the precipitator so as to generate copper / cobalt / nickel of a compound; the copper / cobalt / nickel is recycled so as to acquire a copper / cobalt / nickel concentrate product in a floating method; compared with conventional flotation, cobalt concentrate recycling rate is increased by 34.01%; and nickel concentrate recycling rate is increased by 31.58%.

The invention relates to a beneficiation method of low-grade copper, cobalt and nickel sulphide ore. The technical scheme is adopted as follows: according to the property and characteristics of ore, a selective flocculation desliming-flotation technology is adopted, and technological advantages of differential flotation and bulk flotation are absorbed. The method is good in separation effect and stable in index, accords with property and characteristics of the ore, can effectively eliminate influences of slurry on flotation, and can recycle metal of copper, cobalt and nickel to the greatest extent.

The invention relates to a beneficiation method for high-grade copper-nickel sulphide ore, and belongs to the field of beneficiation methods for copper-nickel sulphide ore. The beneficiation method includes the steps of 1), crushing and screening of raw ore, 2), magnetic separation and preconcentration of the raw ore, 3), grinding separation of low-grade ore, 4), reselection of tailings and 5), flotation of concentrates, concentration and filtration. During floatation, a beneficiation reagent in a specified ratio is added step by step, and high-grade copper-nickel ore of 2.5-5% is processed based on the technological process of low-grade copper-nickel ore of 0.5-1.5%. On the condition of 3.88% nickel grade and 0.56% copper grade of the raw ore, copper-nickel bulk concentrates with comprehensive nickel grade of more than 6% and comprehensive nickel metal recovery rate of 95% are acquired. The method is reliable and advanced in technology, low in investment, high in benefit and high in comprehensive recovery rate of valuable metal, and is an ideal beneficiation method for processing high-grade copper sulphide ore, nickel sulphide ore and copper-nickel sulphide associated ore by the original technological process.

A method of using the synergy of multiple depressants to improve the depression of iron sulphide without compromising the recovery of the valuable sulphide minerals in the flotation of non-ferrous metal sulphides, while reducing or eliminating the use of environmentally problematic chemicals such as polyamines. The method has significant economic and environmental benefits. The multiple depressants comprise at least one organic polymer, at least one sulphur-containing compound and / or at least one nitrogen-containing organic compound.

The invention relates to a copper-nickel sulphide ore catching agent, namely a J622 catching agent. The copper-nickel sulphide ore catching agent is prepared by the following raw materials in parts by weight: 30-60 parts of alkyl xanthate propionitrile ester, 10-30 parts of oil No.2, 10-20 parts of black catching agent No.25, 5-15 parts of amino propionitrile, and 5-15 parts of black catching agent acid. The raw materials are mixed fully and stirred uniformly to prepare the copper-nickel sulphide ore catching agent. The copper-nickel sulphide ore catching agent has catching and foaming doubleattributes, and is good in selectivity, high in catching capability and ore flotation speed, and stable in flotation foam, so that the grade and the recovery rate of the concentrate can be effectively improved; and therefore, the copper-nickel sulphide ore catching agent is a very ideal selective catching agent for copper-nickel ores.

The invention discloses a solvothermal preparation method for an in-situ electrode. The solvothermal preparation method specifically comprises the following steps of dissolving metallic nickel salt, thiourea or selenium powder and ethylenediamine in ethylene glycol solution, adding a transparent substrate material, filling in a hydrothermal kettle, performing solvothermal at 140-230 DEG C for 3-24 h, taking out the transparent substrate, cleaning, and drying so as to obtain the transparent in-situ electrode. Areagent used in the invention is cheap; the preparation method is simple; and furthermore, the prepared in-situ nickel sulphide and nickel selenide electrode has relatively high electrocatalytic activity.

The present invention discloses a preparation method of an iron nickel sulphide. The method comprises the steps of: of obtaining an iron organic acid salt, nickel nitrate and a carbon and nitrogen source organic matter according to a mass ratio of 1:(1-3):(1-7) for mixing and grinding to obtain a mixture A; performing heat treatment of the mixture A for 1-5h at a temperature of 500-1200 DEG C, taking out the mixture A after cooling to obtain a product B, uniformly mixing and grinding of the product B and a sulfur source according to a mass ratio of 1(5-10) to obtain a mixture C; performing heat treatment of the mixture C for 30min-1h at a temperature of 300-600 DEG C, taking out the mixture C after cooling to obtain a product D which is the iron nickel sulphide. The prepared iron nickel sulphide has a cucurbit-shaped structure with active particles continuously coated with carbon layers; the active particles in the structure can maintain the nanoscales in the charge-discharge process,the carbon-coated nano tube structure can protect the material expansion process to maintain the stability of the structure of the active materials, the graphited carbon nano tube can provided a high-speed conductive path, and the iron nickel sulphide can be used for the anode of the sodium-ion battery.

The invention relates to a copper-nickel sulphide ore floatation collector, which is prepared from isobutanol, phosphorus pentasulfide, ammonia water, hydroximic acid and ethionine ester. A preparation method comprises the following steps of: adding the isobutanol into a kettle, adding the phosphorus pentasulfide with stirring, introducing steam to heat to the temperature of the between 70 and 80 DEG C, performing reaction for 2 hours, injecting water into a jacket until the temperature is reduced to 40 DEG C, adding into an ammoniation kettle, injecting water for dilution with stirring, introducing the ammonia water for ammoniation when the concentration is diluted to 70 percent, controlling the ammoniation temperature to be 45 DEG C, and stopping introducing the ammonia water when the pH value reaches 8-9; continuously stirring for 20 minutes to obtain a substance for later use; weighing the substance for later use, the hydroximic acid and the ethionine ester based on weight part; and putting into the kettle sequentially, stirring at normal temperature for 1 hour, and discharging when the pH value is over 7 to obtain the finished product. The copper-nickel sulphide ore floatation collector has the advantages of strong selectivity and high recovery rate.

The invention relates to an ore dressing method for low grade nickel sulphide ore. Through the application of the ore dressing method disclosed by the invention, nickel sulfide ore concentrate can be obtained from the low grade nickel sulphide ore containing serpentine. The ore dressing method disclosed by the invention comprises the following steps of performing ore grinding, performing ore pulp adjustment, performing coarse scavenging on nickel sulphide ore and performing selection on roughing ore concentrate. According to the ore dressing method disclosed by the invention, through the united effects of sulphuric acid and ethylenediaminetetraacetic acid, the out-of-phase coagulation of the serpentine and sulphide minerals is eliminated, and the restraining effects of the serpentine to the sulphide minerals are alleviated; before flotation, the pH of ore pulp is adjusted to weak alkali, and the flotation is performed, so that the corrosion effects of acid ore pulp to flotation equipment are eliminated. Xanthan gum is used as an inhibitor, so that the selective inhibition of lyophobic gangue is realized, and the high-efficient separation of nickel sulfide minerals and the gangue is improved.

The invention relates to a method for processing a nickel product from nickel- bearing sulphidic raw materials, such as nickel sulphide concentrate or ore. According to the invention, the raw material is leached in atmospheric conditions in an aqueous solution of sodium chloride and copper (II) chloride. The reagents needed for leaching nickel and for processing the products, such as chlorine, hydrogen and sodium hydroxide, are obtained from chlorine-alkali electrolysis that is integrated as a step in the process.

A method of using the synergy of multiple depressants to improve the depression of iron sulphide without compromising the recovery of the valuable sulphide minerals in the flotation of non-ferrous metal sulphides, while reducing or eliminating the use of environmentally problematic chemicals such as polyamines. The method has significant economic and environmental benefits. The multiple depressants comprise at least one organic polymer, at least one sulphur-containing compound and / or at least one nitrogen-containing organic compound.

The invention relates to a lithium-sulphur battery cathode material and a preparation method thereof, and in particular relates to a sulphur, nickel oxide and nickel sulphide composite lithium-sulphurbattery cathode material. A preparation process is as follows: a nickel oxide double-layer hollow ball is prepared at first; then, the nickel oxide double-layer hollow ball is partly vulcanized, so that a nickel oxide and nickel sulphide composite is obtained; and then, the material is prepared by sulphur mixing through ball-milling and hot melt methods. The material designed in the invention hasa double-layer hollow ball structure; the relatively high specific capacity is obtained under high current density; the nickel oxide double-layer hollow ball is composed of a nickel oxide nano-sheet;an electron and charge transmission path is shortened; expansion of a material is relieved; furthermore, due to the good mechanical performance, the material has good cycle life; loss of an active substance in a reaction process is reduced in the application process of nickel oxide; a surface oxidation and reduction process is accelerated; and thus, the whole performance of a Li-S battery is improved.

The invention relates to a method for reinforcing copper-nickel sulphide ore flotation separation in industrialized application. According to the method, reinforced mechanical stirring and pulp mixing is carried out on ore pulp before copper-nickel sulphide ore flotation, and the conditions of stirring and pulp mixing process parameters need to meet simultaneously that energy input is in a range from 0.5kW.h / m<3> to 2.5kW.h / m<3>, and the linear speed of the blade end of a stirring impeller is in a range from 7.5m / s to 10.0m / s. The ore pulp after the reinforced stirring and pulp mixing immediately enters the flotation operation, a conventional copper-nickel sulphide ore flotation flow is adopted in the flow of the flotation operation, concentrates are obtained through the flotation and used as final concentrates, and flotation tailings can be re-grinded and re-separated to obtain concentrates, and the tailings are discarded. The invention provides a method for reinforcing copper-nickel sulphide ore flotation separation. According to the method, the negative effects of magnesium silicate ores on the copper-nickel sulphide ore flotation can be weakened and even eliminated, so that copper-nickel sulphide ore resources are efficiently utilized.

The present invention relates to a gravity / flotation circuit where a mineral stream, such as a flotation rougher or cleaner concentrate, undergoes a two stage size separation wherein:i) the screen of the first stage provides a coarse stream of particles greater than 110 microns and a fines stream of particles less than 110 microns; andii) the fines stream of less than 110 microns is subjected to the second stage separation whereupon a cyclone provides an ultrafine / slimes stream of p80 less than about 25 microns and a middlings stream of p80 greater than around 25 microns.The middlings stream is subjected to flotation to recover nickel sulphide which is sent to final concentrate, and reject or depress magnesia which undergoes gravity separation to concentrate the MgO. It has been discovered that a large proportion of the MgO minerals in the concentrate are contained in the 30 to 100 micron size fraction and that they are well liberated making physical separation possible. Furthermore, the nickel sulphide minerals and magnesia minerals have a significantly different specific gravity which can be exploited using gravity separation equipment to achieve magnesia rejection.

The invention relates to the field of electrolysis water catalysts, and provides a dual-function fully-hydrolyzed hydroelectric catalyst. The catalyst comprises a carrier nickel of the net structure,chromium loaded on the carrier nickel and nickel sulfate growing on the carrier nickel. The invention further provides a preparation method of the dual-function fully-hydrolyzed hydroelectric catalyst. The method comprises the steps of mixing a sulfur-containing monomer, chromate and solvents to be uniform to obtain a mixed solution; mixing the mixed solution and foamed nickel to perform a thermalreaction. The fully-hydrolyzed hydroelectric catalyst has the functions of catalysis hydrogen evolution and catalysis oxygen evolution, the reaction overpotential of electrochemical analysis can be lowered, electron transfer of the reaction is promoted, adsorption of water molecules is accelerated, the reaction rate is increased, and the stability is good under the extreme condition. The dual-function fully-hydrolyzed hydroelectric catalyst or a dual-function catalyst prepared through the preparation method of the dual-function fully-hydrolyzed hydroelectric catalyst can be applied to electrolysis of water.

The invention provides an application method of ferric phosphate for reinforcement of bacterial leaching of nickel sulphide ores, wherein the dosage of ferric phosphate is 0.2-0.6g / L; under the action of ferric phosphate, the leaching rate of the bacterial leaching out of the nickel sulphide ores is greatly increased and is more than 95%, and moreover, the oxidation time is greatly shortened; phosphoric acid in ferric phosphate provides the nutritive phosphorus needed by bacteria and reinforces the activity and ore leaching function of the bacteria, and moreover, Fe(III) released from ferric phosphate due to bacterial oxidation and Fe(II) in solution form a high redox couple, thus promoting the oxidative decomposition of the nickel sulphide ores, and Fe(II) and S generated by the decomposition enables the energy of bacterial growth and reproduction to further reinforce the leaching of the nickel sulphide ores, thus promoting the speed of the bacterial leaching out of the nickel sulphide ores, and providing important theoretical and technical guidance for the reinforcement of the bacterial leaching of the nickel sulphide ores.

The invention discloses a method for smelting chromium-containing ferronickel through laterite nickel ore. Nickel sulphide ore, a chromium-containing material and stainless steel smelting waste slag with a certain proportion are added into the laterite nickel ore, a rotary kiln pre-reduction-electric furnace process is adopted for smelting, a chromium-containing ferronickel product is used for producing 300-series austenitic stainless steel, the nickel sulphide ore and the chromium-containing material can serve as a part of a nickel source and a chromium source to improve the nickel and chromium grade in an alloy smelting product, other components in the nickel sulphide ore and the chromium-containing material are matched with multiple components in other stainless steel smelting waste slag to serve as a slag forming constituent to adjust the furnace slag smelting property, the reduction condition of chromium oxides can be improved, and separation of metal and slag can be reinforced. The method can improve the chromium grade and the chromium recycling rate in the ferronickel product, the smelting energy consumption can be greatly reduced, multiple metallurgical waste slag in the stainless steel production process can be sufficiently used, secondary resource recycling can be achieved, enterprise production cost is reduced, and the environment pollution brought by the metallurgical waste slag can be removed.

The system (40) provides for directing a hydrogen-rich reformate fuel stream from a reformer (42) through a sulfur removal bed (50) having a sulfur removal material consisting of manganese oxide secured to a support material. A regeneration fluid is intermittently directed through the bed (50) to remove sulfur and regenerate the bed. A regeneration-produced sulfur containing stream is then directed into a sulfur capture bed (54) having a heat source (60) and a flush inlet (62) and flush outlet (64). The sulfur capture bed (54) includes sulfur capture material consisting of nickel oxysulfide catalyst supported on silicon carbide. When the heat source (60) heats the sulfur capture bed (54) a flush liquid passed through the flush inlet (62), capture bed (54), and flush outlet (64) to transport elemental sulfur to a sulfur storage container (50).

The invention discloses a preparation method of a nickel sulfide nanosheet anchored on the inner surface of a nitrogen-containing hollow carbon matrix, and relates to the technical field of nano materials. The preparation method comprises the following steps of (1) respectively dissolving nickel chloride, polyvinylpyrrolidone and 2methylimidazole in methanol at room temperature to obtain a nickelchloride solution and a 2-methylimidazole solution; (2) mixing and stirring the solution, standing, and centrifuging to obtain a precursor; (3) heating and carbonizing the precursor in an inert gas atmosphere, ultrasonically dispersing the precursor in deionized water, and adding mixed acid; and (4) washing and drying, namely respectively placing the sample and sulfur powder at a lower air port and an upper air port of a tubular furnace, heating and preserving heat. The invention also provides a product obtained by adopting the preparation method and an application of the product. The advantages of the present invention are that the method is safe and easy to implement and is short in synthesis period, large-scale preparation can be achieved, popularization and industrial application are expected, and the material has great application potential at the aspects of batteries, electrochemical energy storage, catalysis and the like.

The invention discloses a method for preparing a hollow ball of sulfide and oxide of nickel. The method comprises the following steps: (1), adopting ultrasonic or mechanical stirring to disperse nickel nitrate, L-cysteine and urea uniformly in deionized water; (2), transferring the mixed liquid into a reaction kettle, and reacting for 8 to 48 hours at a temperature of 140 DEG C to obtain a nickel disulphide hollow ball; (3), calcinating nickel disulphide at different temperatures to obtain hollow balls of nickel monosulfide and nickel oxide respectively; and (4), under hydrothermal condition, reacting nickel disulphide with selenium source and tellurium source respectively for 4 to 48 hours at a temperature of 140 DEG C to obtain hollow balls of nickel diselenide and nickel telluride. According to the method, raw materials are cheap, easy to obtain, and convenient to compound; the required devices are simple; no pollution is caused in the production process; and the large scale production can be realized rapidly.

The invention concerns a method for heat treatment of prestressed glass panes so as to eliminate specimens liable to spontaneous fracture following the growth of included crystals, in particular by the transformation of nickel sulphide of their alpha -phase into their beta -phase (heat soak test), the glass panes, after prestressing treatment, being maintained, during specific time intervals, at a temperature value accelerating the crystal growth; said method consists in bringing the temperature of the glass panes by controlling in the NiS alpha -inclusions from an initial temperature in the domain of a formation of germs of the beta -phase which is below 250 DEG C and above room temperature (domain of germ formation), the temperature modification when the germ formation domain is brought about by control being higher than 2 degrees K / minute and a temperature modification substantially slower is imposed or a specific temperature being maintained during a specific time interval within the germ formation domain. The method is particularly suitable to be executed immediately after prestressing thermal treatment of glass panes, by first of all lowering their temperature and by maintaining same within said germ formation domain.

The invention discloses a preparation method of a nickel sulfate coated ferriferrous oxide particle for an iron-nickel battery, and belongs to the technical field of iron-nickel battery electrode materials. The preparation method comprises the following steps: synthesizing nickel alkyl xanthate from alkyl xanthate and a water-soluble nickel salt according to a molar ratio of 2:1, dissolving the nickel alkyl xanthate in a pyridine solution to obtain a pyridine solution of the nickel alkyl xanthate, uniformly mixing the pyridine solution of the nickel alkyl xanthate with ferriferrous oxide powder, and keeping the temperature at 300-400 DEG C for 20-60 min to obtain the target product. The coating layer of the nickel sulfate coated ferriferrous oxide particle prepared in the invention is uniform and compact, the particle size of a micron-sized ferriferrous oxide particle is reduced into micro-nano or less, the surface of the particle trends to a spheroidic shape, and the nickel sulfate coated ferriferrous oxide particle p can effectively improve the activation rate, the charging efficiency, the discharge capacity, the rate performances and the cycle performances of an iron negative electrode.

The invention relates to an electrode for an alkaline water electrolysis total battery, and a preparation method of the total battery. The total battery comprises a water electrolysis tank body, whichis divided into a cathode cavity and an anode cavity by a diaphragm, wherein the cathode cavity and the anode cavity are not communicated with each other, a cathode and an anode are respectively arranged in the cathode cavity and the anode cavity, the diaphragm is a sulfonated polyetherketone ion exchange membrane, and the anode is a hydrated cobalt-nickel sulfide nanosheet or a hydrated cobalt-nickel sulfide strip generated on the surface of a nickel-based substrate in situ. According to the invention, the electrode with the structure has the characteristics of high surface roughness and large electrochemical reaction area; due to the existence of the two-dimensional nanosheets, electron transfer and substance transfer can be promoted, and more reaction active sites can be provided for water electrolysis reaction, so that the initial potential of OER is reduced, and the speed of the water electrolysis reaction is increased; and the performance of the substrate Ni is stable in an alkaline environment, and the structure of the nickel sulfide is stable due to the doping of the Co element, so that the structure and the catalytic performance of the nickel sulfide are kept stable in the continuous water electrolysis process.

The invention relates to an electrode for an alkaline water electrolysis full battery and a preparation method thereof. The full battery includes a water electrolysis cell body, and the water electrolysis cell body is separated into a cathode cavity and an anode cavity which are not connected to each other by a diaphragm. The cavity and the anode cavity are respectively equipped with a cathode and an anode, and the diaphragm is a sulfonated polyether ketone ion exchange membrane; the anode is a hydrated cobalt-nickel sulfide nanosheet or a hydrated cobalt-nickel sulfide strip formed in situ on the surface of the nickel-based substrate bring. The electrode with this structure has the characteristics of high surface roughness and large electrochemical reaction area. The existence of two-dimensional nanosheets can not only promote electron transfer and material transport, but also provide more reactive sites for water electrolysis reactions. Thereby reducing the onset potential of OER and increasing the speed of water electrolysis reaction. Since the substrate Ni is relatively stable in an alkaline environment, the incorporation of Co elements makes the structure of nickel sulfide more stable, thereby maintaining its structure and catalytic performance during continuous water electrolysis.

The invention relates to a preparation method of a lithium ion battery negative electrode material. The preparation method comprises the following steps of (1) preparing a silicon dioxide nanorod on carbon cloth, (2) growing cobalt nickel sulfide on the surface of silicon dioxide through an electrochemical deposition method, (3) putting the carbon cloth obtained in the step (2) into a NaOH solution to etch SiO2 so as to obtain carbon cloth loaded with hollow nanotube nickel sulfide cobalt, (4) putting the carbon cloth in the step (4) into an HAuCl4 solution, performing ultrasonic treatment, and performing microwave radiation to obtain a hollow tube nickel sulfide cobalt / Au nanoparticle composite material. The preparation process is simple and efficient, and the negative electrode materialhas excellent cycle performance and rate capability when applied to the lithium ion battery.

The invention relates to a method for processing a nickel product from nickel- bearing sulphidic raw materials, such as nickel sulphide concentrate or ore. According to the invention, the raw material is leached in atmospheric conditions in an aqueous solution of sodium chloride and copper (II) chloride. The reagents needed for leaching nickel and for processing the products, such as chlorine, hydrogen and sodium hydroxide, are obtained from chlorine-alkali electrolysis that is integrated as a step in the process.