202 results about "Nickel sulfide" patented technology

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 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.

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 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.

The present invention discloses a metal sulfide-based composite catalyst and a preparation method and application thereof. The metal sulfide-based composite catalyst comprises a MXene substrate and a non-metal atom-doped nickel sulfide nanosheet containing sulfur vacancies loaded on the surface of the MXene substrate. The nickel sulfide nanosheet is doped with non-metal atoms to cause lattice distortion, thereby introducing sulfur vacancies to enhance the ability to capture protons and enhance the reaction activity. At the same time, the nickel sulfide nanosheet is doped with non-metal atoms to increase the number of active sites and improve the conductivity; the sulfur vacancies in the nickel sulfide nanosheet can be used as additional active sites for hydrogen evolution reaction, and at the same time, the electrons are positioned near the defects, which is conducive to the transfer of electrons to proton hydrogen, thereby greatly improving the catalytic performance. There is a synergistic coupling effect between the non-metal atom-doped nickel sulfide nanosheet and the MXene material, which can adjust the electronic structure of the intermediate in the catalytic hydrogen evolution reaction process, reduce its energy barrier, and improve the hydrogen evolution reaction performance.

The nickel cobalt sulfide slag and ternary battery black powder recovery system described in the utility model comprises a microwave device, a leaching device, an impurity removal reaction device, an extraction device, a weight removal reaction device and a precipitation reaction device which are arranged in sequence; the microwave device is connected to the leaching device, and a nickel cobalt sulfide slag inlet is arranged on the microwave device, and a ternary battery black powder inlet is arranged on the leaching device; a first solid-liquid separation device is arranged between the leaching device and the impurity removal reaction device, a second solid-liquid separation device is arranged between the impurity removal device and the extraction device, a third solid-liquid separation device is arranged between the weight removal reaction device and the precipitation reaction device, and the precipitation reaction device is connected to a fourth solid-liquid separation device, and the slag outlet of the fourth solid-liquid separation device is a lithium product outlet. The utility model activates the nickel cobalt sulfide slag through a microwave device, and then uses the oxidizability of the ternary battery black powder to fully cause an oxidation-reduction reaction between the two raw materials, thereby realizing high-value recovery of the valuable metals of the two raw materials.

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 discloses a zirconium-doped nickel sulfide self-supporting electrode material, a preparation method thereof, and an application thereof. The method comprises the following steps: step 1, adding 0.5-3 mmol of zirconium nitrate pentahydrate and 1.5-9 mmol of thioacetamide to a beaker containing 20 mL of anhydrous ethanol, and stirring evenly to obtain a mixed solution A; step 2, firstly transferring the mixed solution A dropwise to a polytetrafluoroethylene liner, then placing 1.5 cm×4 cm×0.2 cm of pure nickel foam into the polytetrafluoroethylene liner containing the mixed solution A, then sealing the polytetrafluoroethylene liner and placing it in an autoclave, finally placing the autoclave in an oven, heating the temperature from room temperature to 120-180° C. at a heating rate of 5° C. / min, and keeping the temperature until the reaction is fully completed; step 3, after the heat preservation is completed, allowing the autoclave to cool naturally to room temperature, taking out the product, cleaning it, and standing it at room temperature. After the product is completely dried, Zr-Ni 0.96 S / NF has excellent catalytic performance for water electrolysis.

The invention discloses a method and a system for purifying a magnesium sulfate solution. The method comprises the following steps: pretreating a magnesium sulfate solution containing nickel and cobalt impurities to remove suspended matters and organic matters in the magnesium sulfate solution; adding sodium hydrosulfide into the pretreated magnesium sulfate solution, enabling nickel and cobalt to respectively react with the sodium hydrosulfide to generate precipitates, and carrying out solid-liquid separation to obtain the purified magnesium sulfate solution and precipitates containing nickel sulfide and cobalt sulfide; evaporating and crystallizing the purified magnesium sulfate solution to obtain magnesium sulfate crystals, and drying to obtain a magnesium sulfate product; and carrying out post-treatment on the precipitate containing the nickel sulfide and the cobalt sulfide, and recovering nickel and cobalt in the precipitate. The method can efficiently remove nickel and cobalt impurities in the magnesium sulfate solution, has the advantages of high efficiency, environmental protection, recoverable resources and the like, and can reduce the production cost and improve the resource utilization rate.

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.