404 results about "Zinc sulphide" patented technology

A process for recovering nickel and cobalt values from nickel- and cobalt-containing laterite ores as an enriched mixed nickel and cobalt sulphide intermediate and for producing nickel and cobalt metal from the nickel and cobalt sulphide intermediate. The laterite ore is leached as a slurry in a pressure acid leach containing an excess of aqueous sulphuric acid at high pressure and temperature, excess free acid in the leach slurry is partially neutralized to a range of 5 to 10 g/L residual free H₂SO₄ and washed to yield a nickel- and cobalt-containing product liquor, the product liquor is subjected to a reductant to reduce any Cr(VI) in solution to Cr(III), the reduced product liquor is neutralized to precipitate ferric iron and silicon at a pH of about 3.5 to 4.0, and the neutralized and reduced product liquor is contacted with hydrogen sulphide gas to precipitate nickel and cobalt sulphides. The precipitated nickel and cobalt sulphides can be leached in a water slurry in a pressure oxidation leach, the leach solution subjected to iron hydrolysis and precipitation, the iron-free solution contacted with zinc sulphide to precipitate copper, the iron- and copper-free solution subjected to zinc and cobalt extraction by solvent extraction to produce a nickel raffinate, the nickel raffinate contacted with hydrogen gas to produce nickel powder and the cobalt strip solution from the solvent extraction step contacted with hydrogen gas to produce cobalt powder.

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a method for individually processing high-iron zinc sulfide concentrate. The method comprises a step of subjecting the high-iron zinc sulfide concentrate to calcination in a fluidized bed combustion boiler to obtain zinc calcine; a step of subjecting the zinc calcine to neutral leaching to produce neutral leaching solution and neutral leaching residue; a step of, after the neutral leaching residue and the high-iron zinc sulfide concentrate are mixed, successively performing reduction leaching and oxidation leaching, and circulating oxidation leaching solution to the reduction leaching to produce reduction leaching solution and silver-rich sulfur residue; a step of replacing the reduction leaching solution by using iron powder to precipitate copper and to produce copper-rich slag and solution after copper precipitation; a step of subjecting the solution after copper precipitation to pre-neutralization by using the zinc calcine, and then replacing by using zinc powder to precipitate indium and to produce indium-rich slag and solution after indium precipitation; and a step of bubbling oxygen into the solution after indium precipitation, heating and removing iron to obtain iron removal solution and hematite slag. The hematite slag can be utilized as a raw material for ironmaking. The method has strong pertinence, short technological process and high metal recovery yield, and the method is clean, efficient, energy-saving and environmental friendly. Separation and comprehensive utilization of zinc, indium, copper and iron are achieved.

The invention discloses a method for preparing zinc sulfide nanospheres, which comprises the following steps: 1) preparing a solution A by dissolving zinc acetate and a surfactant in deionized water, and preparing a solution B by dissolving thioacetamide in deionized water; and 2) mixing the solution A and the solution B to obtain a reaction solution, reacting the reaction solution in a water bath and obtaining zinc sulfide nanospheres, wherein the particle size of the zinc sulfide nanospheres can be kept between 90 and 120 nanometers by controlling reaction conditions. The method has the characteristics of readily available raw material, simple equipment, easy operation, high efficiency, high speed and the like; and the prepared zinc sulfide nanospheres with regular form, high dispersity, controllable size, high yield and high stability are suitable for mass industrial production. The zinc sulfide nano material prepared by the method has a great application prospect in fields of fluorescent lamps, field emission flat-panel displays, light-emitting diodes, electroluminescent devices, solar cells and the like.

The invention discloses a beneficiation method of micro-fine particle dissemination type lead-zinc sulphide ore containing marmatite and pyrrhotite. For the complicated nature of micro-fine particle dissemination type lead-zinc sulphide ore containing marmatite and pyrrhotite, the zinc-sulphide two-stage bulk flotation-zinc-sulphide mixed rough concentrate regrinding and separation technology is adopted, easy-floating zinc-sulphide minerals are preferentially floated during zinc-sulphide mixed first-stage flotation, difficult-floating marmatite flotation is reinforced in the second stage, two-stage mixed rough concentrate is reground so as to promote sufficient monomer separation of zinc-sulphide intergrowth minerals, activated carbon is added in the regrinding process to enhance mineral surface reagent removal, during separation floatation, XKY-12 is added to form deep restraining of pyrrhotite, and efficient separation of marmatite and pyrrhotite is enhanced; according to the method, the good ore dressing recovery rate is ensured, and qualified and high-quality zinc concentrate is obtained; meanwhile, the efficient pyrrhotite inhibitor XKY-12 is adopted, and the problems that the marmatite and pyrrhotite separation efficiency is low and the separation precision is poor are solved.

The present invention relates to compositions for producing poly(meth)acrylimide foams having reduced flammability which comprise ammonium polyphosphate and/or zinc sulphide. Furthermore, the present invention also provides poly(meth)acrylimide moulding compositions and also poly(meth)acrylimide foams obtainable from the abovementioned compositions and moulding compositions. The present invention further relates to processes for producing poly(meth)acrylimide foams having reduced flammability.

The invention discloses a preparing method for a zinc sulfide-graphene composite material for a lithium ion battery negative electrode and application. The preparing method includes the step that the ZnS-RGO composite material is obtained through in-situ synthesis, centrifugation and drying to serve as the lithium ion battery negative electrode. A button type lithium ion battery is assembled, a charging and discharging performance test is carried out on the ZnS-RGO composite sample electrode under the current density of 40 mA/g, and the charging and discharging performance of the ZnS-RGO composite sample electrode is compared with that of a pure ZnS electrode. The result indicates that the first-time charging and discharging specific capacity and the circulation stability of the ZnS-RGO composite sample electrode are improved. After circulation for 25 weeks, the reversible discharging capacity of the ZnS-RGO composite sample electrode can reach 135.9 times that of the pure ZnS electrode. The discharging specific capacity and the circulation stability of the ZnS-RGO composite sample electrode are improved.

The invention relates to a novel flotation method of lead-antimony-zinc sulphide ores, particularly for selecting low-grade complex refractory lead-antimony-zinc sulphide ores. A method of ore selecting and washing is adopted, which combines washing and selection and eliminates interference of unfavorable factors such as harmful ions, drugs, slurry and the like on the selection of the low-grade lead-antimony-zinc so as to effectively improve the ore selection technical economical indexes of low-grade lead-antimony-zinc sulphide ores. The method has great significance on the improvement of utilization rate of ore resources and effective recovery of old, incomplete and waste ore resources and secondary resources, imposes important influence on the ore selection area suffering increasing insufficiency of ore resources, and is suitable for floating recovery of low-grade non-ferrous metals such as lead, non-ferrous metal, zinc and molybdenum.

The invention provides an antimicrobial thermal-insulation coating for fabrics and a preparation method thereof. The fabric coating has favorable thermal insulation property and is harmless to human bodies. The preparation method has the advantages of simple technique and low production cost, and is suitable for industrial production. The fabric with the composite coating is applicable to the fields of outdoor supplies, clothing, construction, military affairs and the like, and is widely applied to the occasions in need of heat preservation and thermal insulation. The coating comprises the following components in percentage by weight: 20-30% of ethanol, 5-10% of dioctyl phthalate, 0.6-0.9% of polyvinyl formal, 15-20% of zinc sulfide/magniferous aluminum oxide composite material, 5-12% of polyethyleneglycol and the balance of polyurethane.

A method and apparatus for pyrolytic destruction of polymer products including whole vehicle vulcanised rubber tyres is disclosed. The apparatus 111 has a reaction chamber 153 into which a tyre can be placed, and immersed for pyrolytic decomposition in a molten alloy of zinc with a minor proportion of aluminium. The apparatus 111 has a heated reservoir 155 in which the alloy is maintained in a molten state, and from where it can be transferred to the reaction chamber 153 to immerse the tyre. Fluid hydrocarbon byproducts are drawn off for condensation and recovery, and solid zinc sulphides are also recovered. Where steel belted tyres are processed, carbon and steel residues are also recovered.

The invention discloses a copper soot smelting and separation combined treatment method. Copper soot is leached in water solution after ball milling to a requested particle size; sodium sulfide is added to control the metal ion mixed potential of whole pulp at a requested numerical value; meanwhile, sulfuric acid is added to adjust the pH value of the pulp to keep at a requested numerical value; after the solution potential is stabilized, and the stirring is continued by a period of time, the filtration is performed; the leaching liquid controls the metal ion mixed potential and the pH value; arsenic sulfide and zinc sulfide precipitates are respectively prepared to send to waste water for treatment; and leaching slag directly performs flotation to prepare copper concentrate and flotation tailing after alkaline ball milling conversion. The method recovers valuable metal step by step by using a control potential vulcanization leaching and beneficiation combined method; the processes are tightly associated; and single process cannot achieve the desired effect of selection and separation of the valuable metal in copper soot. The leaching rates of arsenic and zinc both reach above 95.0%; and the direct recovery rate of copper reaches above 98.0%.

The invention discloses a separation method of lead-zinc sulphide minerals, which belongs to the technical field of mineral dressing. The separation method utilizes crude ore of the lead-zinc sulphide minerals as raw materials and includes steps of performing flotation separation for the crude ore of the lead-zinc sulphide minerals to obtain lead concentrates or obtain lead concentrates and zinc concentrates, and water-soluble thiol acetate or thioglycolic acid is added to be utilized as an inhibitor of the zinc sulphide minerals in separation minerals. Because the water-soluble thiol acetate or thioglycolic acid which is utilized as the inhibitor of the lead-zinc sulphide minerals has advantages of fine selectivity, strong inhibition capacity, low usage, convenient adding and the like, the water-soluble thiol acetate or thioglycolic acid not only can inhibit the zinc sulphide minerals well, but also can achieve better flotation effect. Simultaneously, the water-soluble thiol acetate or thioglycolic acid is low in environment influence and does not pollute environments, thereby improving production conditions well and overcoming the shortage that high common agent usage pollutes and damages the environment.

The invention provides a treatment technique of a copper-containing high-indium high-iron zinc sulfide concentrate, relating to a slag/ore synergic leaching-combined iron precipitation technique of a copper-containing high-indium high-iron zinc sulfide concentrate. The technique comprises the following steps: (1) roasting the high-iron zinc sulfide concentrate in a fluidized bed furnace to obtain high-iron zinc calcine; (2) carrying out neutralizing hydrolysis on the high-iron zinc calcine and a zinc-hydrometallurgy electrolysis waste liquid for impurity removal to generate a medium immersion liquid and medium immersion slag; (3) mixing the medium immersion slag with high-iron zinc calcine and a weak acid solution to generate a weak acid solution and weak acid slag; (4) mixing the weak acid slag with the high-iron zinc sulfide concentrate and a strong acid solution to perform slag-ore synergic leaching to generate a synergic leach solution and synergic leach slag; (5) carrying out strong acid leaching on the synergic leach slag to generate a strong acid solution and strong acid slag; (6) separating and recovering copper and indium from the synergic leach solution by a two-stage continuous replacement technique to generate copper-rich slag, indium-rich slag and an indium precipitation solution; and (7) carrying out high-temperature oxygen-pressure hydrothermal iron precipitation on the indium precipitation solution to obtain an iron precipitation solution and recoverable iron slag. The technique has high metal recovery rate, and solves the problem of zinc-iron separation.

The invention provides a low-grade multi-metal sulfide mineral selective bioleaching technology. The process is as follows: pile building is performed on the raw mineral materials, dilute acid solution is adopted for presoaking, and efficient mineral leaching bacteria are led in for leaching after the acidity of the mineral pile is basically stable; pile unloading is performed when the leaching of nickel reaches more than 80 wt%, then pile building is performed again on the leaching residue, and thermophilic bacteria are led in for leaching; and when the concentration of nickel in the leaching agent is more than 2.0 g/L, open-cycle is performed on the partial leaching agent, sodium sulfide is added into the leaching agent for fractional precipitation, so as to obtain copper sulphide, zinc sulphide and nickel and cobalt sulphide products, after precipitation is completed, lime is added into the leaching agent for neutralization, wherein concentration of iron in the neutralized leaching agent is less than 1.0 g/L, and the neutralized leaching agent can be reused at the leaching stage. According to the invention, technological process is short, equipment is simple, investment conservation and zero contamination are realized, cost is low, recovery rate of valuable metal is improved, the purpose of comprehensively utilizing low-grade multi-metal sulfide mineral resources is realized, and greater economic benefits can be achieved.

Wire or cable insulation comprising at least 30 %, preferably at least 40 %, of polypropylene homo- and/or co-polymer, and comprising at least 2 %, preferably at least 4 % zinc sulphide and/or at least 5 %, preferably at least 10 %, zinc oxide, percentages being by weight based on the whole insulation composition. Preferably, the insulation contains little or substantially zero hydrated flame-retardant fillers and substantially zero mercaptobenzimidazole, and a majority by weight or substantially all of any propylene copolymers present are copolymers of propylene with halogen-free co-monomers.

The invention provides a method for pretreating indium-containing zinc oxide acid supernatant. The method comprises the following steps of: A, reducing, to be specific, adding ball-milled zinc sulfide concentrate into the indium-containing zinc oxide acid supernatant, reacting and then filtering to obtain a reducing solution; B, purifying, to be specific, adding iron powder in the reducing solution, qualitatively detecting until the content of Fe<3+> in the reducing solution is qualified, thus obtaining a purifying solution; C, carrying out desilicication, to be specific, adding bone glue in the purifying solution to obtain a desilicication solution; D, deoiling, to be specific, adding a deoiling agent into the desilicication solution to obtain a deoiling solution; and E, regulating acidicity and the zinc ion concentration and filtering, to be specific, adding sulfuric acid and water in the deoiling solution until the system acidicity and the zinc ion concentration reach the extraction requirements, then filtering to obtain a pretreating solution and pretreating slag. According to the method for pretreating the indium-containing zinc oxide acid supernatant, impurities in the indium-containing zinc oxide acid supernatant, which influence the indium extraction, can be removed so that a pre-extraction feed liquid suitable for direct extraction of indium is obtained; and meanwhile, valuable metals such as bismuth, copper and tin are enriched.

Methods for improving bearing performance in compressors, especially for those that use high energy refrigerants or that have a high-side design, are provided. The compressor comprises a bearing that is substantially free of lead. The bearing comprises copper and at least one lubricant particle type selected from a group consisting of: molybdenum disulfide (MoS2), calcium fluoride (CaF2), tungsten disulfide (WS2), zinc sulfide (ZnS), hexagonal boron nitride, polytetrafluoroethylene (PTFE), carbon fiber, graphite, graphene, carbon nanotubes, carbon particles, thermoset polyimide, and combinations thereof. The compressor processes a high energy refrigerant and a lubricant oil comprising a sulfur-based additive. The sulfur-based additive reacts with the copper in the bearing to enhance lubricity and improve performance of the bearing in the compressor machine. Compressors having such features and improved bearing performance are also contemplated.

The invention belongs to the technical field of zinc hydrometallurgy, and particularly relates to a combined leaching method for high-iron zinc sulfide concentrate and high-iron zinc calcine leaching slag. The method comprises a step of mixing the high-iron zinc sulfide concentrate and the high-iron zinc calcine leaching slag according to a mass ratio of 0.15:1-0.35:1; a step of adopting a solution containing 160-190 g/L of sulfur acid as a leaching agent; a step of adding 1-3 kg sodium lignosulphonate per ton zinc concentrate allowing that the liquid-solid ratio is 6-8 mL/g; and a step of reacting at 85-95 DEG C for 2-4 h under stirring to leach out valuable metals comprising zinc, indium and copper and to reduce Fe<3+> to Fe<2+>. According to the method, a hot-acid leaching technology of zinc leaching slag and a high-iron leaching solution reduction technology are combined to be completed in a process, thereby improving the leaching rate of the valuable metals, achieving efficient reduction of the Fe<3+>, and contributing to subsequent extraction of the zinc, the copper and the indium. The method is characterized by being short in technology process, clean, efficient, energy-saving, and the like.

The invention discloses a recycling method for mineral processing waste water with high leaching residue content in zinc hydrometallurgy. In the recycling method, a P204 extract phase is used to extract zinc-bearing solution; waste electrolyte in a zinc-metallurgical electrolysis system is used to reextract a P204 organic extraction phase to allow zinc in the P204 organic extraction phase to enter the waste electrolyte; and reextraction solution returns to a zinc hydrometallurgy leaching system after deoiling. In the recycling method, zinc sulphide concentrate is added to the mineral processing waste water with mineral processing reagent content exceeding 200mg/L after filtration treatment to be mixed for primary adsorption; and the zinc sulphide concentrate can effectively absorb aerofloat in the mineral processing waste water and remove excessive mineral processing reagent from the mineral processing waste water. The zinc recycled by the recycle method can be conveniently applied to the existing facility; the reextraction solution can directly return to the zinc hydrometallurgy leaching system after the deoiling; the process produces no pollution; the recyclable zinc metallicity can be increased; and better economic benefit is achieved.

The invention discloses a spectral selective radiation infrared stealth material which sequentially comprises a substrate, an aluminum nitride layer and a dielectric layer, the dielectric layer is composed of a plurality of dielectric layers A and dielectric layers B which are arranged alternately; the dielectric layer A is made of any one of germanium, tellurium and silicon, and the dielectric layer B is made of any one of zinc sulfide, zinc selenide, magnesium fluoride, barium fluoride and calcium fluoride. The preparation method of the material comprises the following steps: (1) cleaning and drying the substrate; (2) preparing an aluminum nitride layer on the surface of the substrate by adopting a magnetron sputtering or tape casting method; and (3) adopting magnetron sputtering or electron beam evaporation, depositing a dielectric layer A on the aluminum nitride layer firstly, then depositing a dielectric layer B on the aluminum nitride layer, depositing the dielectric layer A andthe dielectric layer B repeatedly and alternately until the designed number of layers is reached, and completing preparation of the infrared stealth material. The spectral selective radiation infraredstealth material disclosed by the invention considers the requirements of low emissivity and radiation heat dissipation, and has important significance for better realizing infrared stealth.