81 results about "Lead sulfide" patented technology

The invention discloses a composite modified material for a lithium niobate wafer, and relates to the technical field of nano materials. The material is composed of an anti-corrosion passivation matrix and a function enhancement component, wherein the anti-corrosion matrix adopts a silicon nitride / SiO2 multi-layer composite layer, atomic layer deposition titanium dioxide and magnetron sputtering aluminum oxide to form cascade protection; the functional layer comprises lead sulfide nanoparticles and nano silicon dioxide, and is directionally modified by a silane coupling agent and a perfluoropolyether surfactant. During preparation, PbS nano-particles are synthesized by combining a PECVD-ALD-magnetron sputtering stepped deposition process (200-150 DEG C) with a solvothermal method, and finally, the PbS nano-particles are formed through spin coating-annealing (300-400 DEG C). The optical loss of the material under the wavelength of 1550 nm is smaller than 0.2 dB / cm, the acid and alkali corrosion resistance is larger than 240 h, the lead dissolution rate is smaller than 0.1 ppm, the interface state density is reduced by 2 orders of magnitude, the contradiction between lithium niobate wafer surface degradation, photoelectric property degradation and lead-containing material environment risk is solved, and the material is suitable for 5G optical waveguide and quantum integrated device packaging.

The invention provides a method for preferentially extracting lithium from a waste lithium-containing material, and relates to the field of battery recovery. Mixing the waste lithium-containing material with a lead-containing compound, and roasting to obtain roasted sand; carrying out water leaching on the roasted product, and carrying out solid-liquid separation to obtain lithium-rich water leaching liquid and water leaching residues; the water leaching residues are subjected to acid leaching and liquid-solid separation, and acid leaching residues and acid leaching liquid are obtained; the waste lithium-containing material comprises black powder and / or positive electrode powder; the lead-containing compound comprises lead sulfate and / or lead sulfide. A lead-containing compound is added into a waste lithium-containing material for roasting-water leaching, the leaching rate of lithium can be 99% or above, nickel / cobalt / manganese near-zero leaching can be achieved, the production cost of lithium extraction is reduced, and efficient extraction of lithium is achieved; the leaching rate of nickel / cobalt / manganese is 99% or above only by performing simple acid leaching on the water leaching residues, and lead is nearly zero leaching and exists in the acid leaching residues in the form of lead sulfate.

The utility model provides a spectral responsivity calibration device, and relates to the technical field of optical metrology. The device comprises a light source module, a light path module, a detection module, a control system and a packaging box, wherein the control system is respectively in communication connection with a light source, a light path and the detection module; the light source module is a direct-current voltage-stabilizing light source combined by a deuterium lamp and a halogen lamp; the light path module comprises an adjustable grating, a monochromator, a reflector and a lock-in amplifier, and the light path module is of a double-light-path design; the detection module comprises a reference detector, a standard detector and a detected detector. The standard detector is composed of a standard silicon detector, a standard indium gallium arsenic detector, a standard germanium detector and a standard lead sulfide detector. The device can be used for calibrating the spectral responsivity of ultraviolet, visible and near infrared detectors, and can be used for measuring and calibrating the spectral responsivity of the detected detector through a comparison method by arranging standard detectors such as silicon, germanium, indium gallium arsenic, lead sulfide and the like.

The invention discloses a flotation system for lead-zinc sulfide ore containing pyrrhotite, a technological method of the flotation system and a water treatment method, and belongs to the field of flotation and water treatment. Rough concentrate of the lead-sulfur mixed flotation tank is connected with the lead-sulfur concentration subsystem, tailings are connected with the lead-sulfur scavenging subsystem, lead-sulfur mixed flotation concentrate is connected with the thickener, overflow is connected with the buffer water pool, and underflow is connected with the lead-sulfur separation flotation tank. Lead rough concentrate is connected with the lead concentration subsystem, lead concentrate is connected with the filter press, and filtrate is connected with the buffer water pool. Roughing tailings are connected with a lead scavenging subsystem, sulfur concentrate is connected with a filter press, and filtrate is connected with a buffer water tank. Lead-sulfur mixed flotation tailings are connected with a zinc flotation roughing tank, zinc rough concentrate is connected with a zinc concentration subsystem, zinc concentrate is connected with a zinc concentrate filter press, and filtrate is connected with a buffer water pool. Roughing tailings are connected with the zinc scavenging subsystem and the sedimentation tank, and supernate is connected with the buffer water tank. The buffer pool is connected with ore grinding equipment. The problem that the pyrrhotite is difficult to inhibit after being activated in the zinc blende activation process is solved, the grade and the recovery rate of the zinc concentrate are improved, and the water treatment process is simplified.

The spectrograph comprises a light-emitting element, a diaphragm, a light splitting element and a lead sulfide quantum dot photoelectric detector, the light-emitting element is used for emitting light, the diaphragm is arranged on a propagation path of the light emitted by the light-emitting element, and the diaphragm is used for limiting the width of the light which is emitted by the light-emitting element and passes through the diaphragm. The light splitting element is arranged on a propagation path of light rays irradiated by the diaphragm and used for dispersing the light rays irradiated by the diaphragm into light rays with multiple wavelengths, and the lead sulfide quantum dot photoelectric detector is arranged on the propagation path of the light rays dispersed by the light splitting element and used for receiving the light rays dispersed by the light splitting element and converting the light rays into electric signals. According to the spectrograph provided by the embodiment of the invention, the Pbs quantum dot photoelectric detector is adopted, so that the spectrograph can cover a relatively wide spectral region, the detector does not need to be replaced when the spectrograph performs detection, the detection efficiency is improved, and the cost is reduced.

The invention relates to a QWLED of a three-dimensional heterojunction quantum well composite light-emitting layer based on cadmium selenide and lead sulfide quantum dots and a preparation method of the QWLED, and belongs to the field of LED preparation. The QWLED sequentially comprises an electrode layer, an inorganic electron transport layer, a CdSe / PbS three-dimensional heterojunction quantum well composite light-emitting layer, an organic hole transport layer and an ITO glass substrate from top to bottom, and the CdSe / PbS three-dimensional heterojunction quantum well composite light-emitting layer is of a three-dimensional heterojunction quantum well structure formed by compounding wide bandgap cadmium selenide quantum dots and narrow bandgap lead sulfide quantum dots. The CdSe / PbS quantum well composite material prepared by the invention has a three-dimensional depletion region and a three-dimensional heterojunction structure, high quantum efficiency, good optical characteristics and structural stability, and the prepared LED device with the three-dimensional depletion region and the three-dimensional heterojunction quantum well structure has excellent electroluminescent efficiency and external quantum efficiency, and can be used as a light emitting diode device of the three-dimensional depletion region and the three-dimensional heterojunction quantum well structure. And the method has huge application potential in the fields of high-brightness, long-service-life and high-resolution display technology and the like.

The preparation method of the high-temperature-creep-resistant nano-composite pressure vessel steel comprises the following steps that a lead sulfide precursor is dissolved in an organic solvent, and heating reaction is conducted under the inert gas condition to generate lead sulfide quantum dots; mixing quantum dots with amphiphilic molecules, and performing ultrasonic emulsification to form a quantum dot colloidal solution; mixing the quantum dot colloidal solution with supercritical carbon dioxide to form a homogeneous fluid phase; the steel matrix is placed in a high-pressure reaction kettle, the homogeneous fluid phase is introduced, permeation is conducted for 2-4 h under the conditions that the pressure is 10-15 MPa and the temperature is 50-70 DEG C, and a steel billet is obtained; the steel billet is placed in hot isostatic pressing equipment, heat preservation and pressure maintaining are conducted for 1-2 h in the inert gas environment under the conditions that the pressure ranges from 150 MPa to 200 MPa and the temperature ranges from 800 DEG C to 900 DEG C, and then the steel billet is cooled to the room temperature; semiconductor quantum dots are introduced into a metal matrix, atomic-scale interface strengthening is achieved through the quantum effect and the supercritical fluid permeation technology, and the steady-state creep rate of the material at the temperature of 600 DEG C can be reduced to 1 / 10 of that of a traditional process by combining the microcosmic strengthening advantage of the quantum dots and the macroscopic permeation advantage of supercritical fluid.

The application discloses a kind of high oxidation rate lead-zinc oxide ore aerated sulphidation flotation and tailings discharge process, belong to mineral processing technical field.The method includes the following steps: grinding to lead-zinc oxide ore raw ore, obtain slurry;Sodium sulfide is added to slurry, and under the condition of aerated stirring, sulphidation reaction is carried out, and sulphidation slurry is obtained;Collector and foaming agent are added to sulphidation slurry, and flotation is carried out, and lead concentrate and zinc concentrate are obtained.The application introduces forced aerated stirring in the sulphidation process, strengthens the mass transfer process among gas-liquid-solid three phases, promotes the generation of dense, stable lead sulfide film on the surface of lead oxide minerals, solves the problem of low sulphidation efficiency of traditional sulphidation process.The application is used to treat refractory lead-zinc oxide ore containing Pb 5.59%, Zn 44.02%, oxidation rate more than 90%, and closed-circuit test can obtain qualified lead concentrate with lead grade of 60.72% and lead recovery rate of 79.53%, while lead flotation tailings directly become zinc concentrate with zinc grade of 46.33% and zinc recovery rate of 98.41%, realizing efficient separation of lead and zinc and tailings discharge.

The invention relates to an infrared light sensor which comprises a substrate, and a first electrode, a light sensing unit and a second electrode which are sequentially formed from the surface of the substrate, and the substrate and the first electrode have infrared light penetrability. The light sensing unit is arranged on the surface, opposite to the substrate, of the first electrode, is used for absorbing and sensing infrared light, and is provided with a zinc oxide-based (ZnO-based) layer, a first lead sulfide-based (PbS-based) modified layer and a second lead sulfide-based (PbS-based) modified layer which are sequentially far away from the substrate from the surface of the first electrode, the first lead sulfide-based modified layer comprises a plurality of halogen ion modified lead sulfide nanoparticles, and the second lead sulfide-based modified layer comprises thiol molecule modified lead sulfide.

The application provides a method for preparing lead sulfide from a complex lead sulfide ore, and belongs to the technical field of lead sulfide preparation. The complex lead sulfide ore is subjected to vacuum distillation to obtain crude lead sulfide; the temperature of the vacuum distillation is 700-1200 DEG C, the time is 30-120 min, and the vacuum degree is 1-10 Pa; the crude lead sulfide is mixed with an alkaline solution to perform alkaline leaching, solid-liquid separation, and then lead sulfide pure product is obtained. In the application, the temperature and heating time are controlled under vacuum conditions, the structure of the solid solution in the original mineral is broken, the lead sulfide is volatilized alone, preliminary separation is realized, and then the lead sulfide with high purity is obtained through the wet leaching method. The examples show that the purity of the lead sulfide obtained through the vacuum distillation-alkaline solution leaching method is 90-98%, the Sb content is 0.5-3%, the lead sulfide has high purity, and the lead sulfide is directly obtained from the complex lead sulfide ore.

Methods of fabricating nanocrystals are disclosed. Such methods may include providing copper sulfide core nanocrystals and providing a lead precursor. Moreover, the copper sulfide core nanocrystals may be reacted with the lead precursor to generate copper doped lead sulfide nanocrystals. Related nanocrystals and optoelectronic devices are also disclosed.

The application discloses a copper-lead separation inhibitor and a preparation method and an application method thereof, and the preparation method comprises the following steps: mixing acrylic acid-2-acrylamide-2-methylpropane sulfonic acid copolymer, hydrolyzed polymaleic anhydride, sodium silicate and sodium sulfite, and performing emulsification and dispersion to obtain a uniform viscous suspension. The application method comprises the following steps: adding active carbon, sodium sulfide, the copper-lead separation inhibitor, a collector Z-200 and a foaming agent No. 2 oil into copper-lead mixed concentrates to perform copper-lead separation flotation operation; performing three times of cleaning on the copper rough concentrates; and performing three times of scavenging on the obtained lead rough concentrates. The inhibitor composition is non-toxic; the inhibitor is rich in carboxyl and sulfonic acid groups, and under the action of the two main groups, the adsorption effect of the inhibitor on the surface of galena can be enhanced; the inhibitor can be used under neutral, weak acidic and weak alkaline conditions, has strong inhibition effect on galena, is strong in selectivity, is easy to obtain and store, is friendly to the environment, and can effectively improve the flotation separation indexes of copper-lead sulfide ores.

The invention discloses a photoelectric detector with a silicon nanowire / lead sulfide / graphene composite structure. The photoelectric detector comprises an indium gallium electrode, a silicon substrate, a silicon oxide layer, a silicon nanowire, a lead sulfide submicron crystal and a graphene / PMMA layer which are sequentially arranged from bottom to top, the solar cell further comprises a gold electrode arranged on the surface of the silicon oxide layer, and the other face of the gold electrode is in contact connection with the graphene / PMMA layer. According to the photoelectric detector, the lead sulfide crystal film is grown on the surface of the silicon nanowire in situ through an electrochemical deposition method, and a silicon / lead sulfide structure with good interface contact and synergistic effect is constructed; meanwhile, rapid separation and transportation of carriers are realized by utilizing high carrier mobility of the silicon nanowires and heterojunction energy band engineering, and dark current and response speed are effectively reduced. Finally, a suspended graphene top electrode structure design is introduced, effective collection of signals is realized by using the advantages of high light transmittance (97.7%) and mechanical flexibility of graphene, and efficient transmission of photon-generated carriers at an interface is ensured.

The preparation method comprises the following steps: (1) adding a lead salt and diammonium hydrogen phosphate into deionized water, stirring at room temperature, dropwise adding ammonia water into the deionized water in the stirring process, continuously stirring to obtain a mixed solution, adding the mixed solution into a hydrothermal kettle for reaction at the hydrothermal temperature of 100-200 DEG C for 10-30 hours, and filtering to obtain a filtrate; carrying out solid-liquid separation on a white product after the reaction to obtain a solid matter, drying the solid matter at 50-60 DEG C, and then carrying out high-temperature calcination to obtain lead phosphate powder; and (2) vulcanizing the lead phosphate powder to prepare the infrared detection material based on vulcanized lead phosphate. The prepared infrared detection material based on sulfurized lead phosphate is used for an infrared detector. The synthesis method has the beneficial effects that 1, the synthesis method is simple and low in cost, the used solvent is environment-friendly and green, and the synthesis method is suitable for large-scale production; and 2, the vulcanized lead phosphate disclosed by the invention has an ultra-low band gap and has the feasibility of infrared detection.

The application provides a copper-lead sulfide ore flotation separation inhibitor and a preparation method and application thereof, and belongs to the technical field of ore-dressing reagents. The main components of the inhibitor are maleic acid acrylic acid copolymer, trisodium nitrilotriacetate and sodium sulfite. In the preparation, the maleic acid acrylic acid copolymer, the trisodium nitrilotriacetate and the sodium sulfite are mixed at normal temperature, and then are added into a high-shear emulsifying machine to be emulsified and dispersed, so that a uniform viscous suspension inhibitor is obtained. In the application, after the raw ore is treated, preselected ore slurry is obtained; copper-lead mixed flotation is performed first to obtain copper-lead mixed concentrate and copper-lead tailings; active carbon and sodium sulfide are added into the copper-lead mixed concentrate first, and reagents are added to perform copper-lead separation flotation to obtain copper and lead concentrates. The inhibitor has the advantages of being cheap, easy to obtain and store and environment-friendly. The inhibition effect on galena is good, the copper-lead sulfide ore separation effect is good, and the ore-dressing indexes are effectively improved.

The present invention relates to the field of chemical synthesis technology, and specifically to a preparation method of aluminum sulfide. The method comprises the following steps: S1, mixing lead sulfide and aluminum powder to obtain a mixture; S2, wrapping and compacting the mixture with an iron sheet, roasting at a temperature of 600-800 °C for 3-8 h, and cooling to room temperature to obtain an intermediate powder; S3, screening the intermediate powder to obtain a primary clinker; S4, roasting the primary clinker at a temperature of 860-950 °C for 3-8 h, and cooling to room temperature to obtain aluminum sulfide powder. The problems in the existing preparation method of lead sulfide, such as violent reaction during the preparation process, generation of toxic gases, and inability to separate the product from the raw materials, are solved.

The invention provides a chiral lead sulfide quantum dot and a preparation method thereof.The preparation method of the chiral lead sulfide quantum dot comprises the following steps that S1, a lead precursor solution is provided, and a lead precursor comprises at least one of chiral CsPbBr3 quantum dots and (R-MBA) PbBr3; s2, dissolving sulfur in the organic amine ligand to obtain a sulfur precursor; s3, mixing the lead precursor solution with the sulfur precursor, and stirring and reacting at room temperature to obtain a crude solution; s4, the crude solution is purified, centrifuged and dried, and the chiral lead sulfide quantum dots are obtained. The chiral lead sulfide quantum dot can be rapidly synthesized at room temperature in an air environment, the conditions are mild, the efficiency is high, the cost is low, and the chiral lead sulfide quantum dot is good in dispersity and stable in property.

The invention relates to a method for removing elemental sulfur in lead-zinc smelting sulfur-containing smoke leachate. The invention provides a method for removing elemental sulfur in lead-zinc smelting sulfur-containing smoke leachate, which comprises the following steps: adding lead powder into the lead-zinc smelting sulfur-containing smoke leachate, carrying out heat preservation reaction, and then carrying out liquid-solid separation to obtain a zinc sulfate solution and leaching residues. According to the method, the lead powder is added into the lead-zinc smelting sulfur-containing smoke dust leaching solution, elemental sulfur in the leaching solution is removed, an inactive compound lead sulfide precipitate is generated, lead sulfide is separated from the lead-zinc smelting sulfur-containing smoke dust leaching solution, and the purpose of eliminating the influence of elemental sulfur is achieved; the removal method disclosed by the invention is simple, efficient and easy to operate, the reagent cost is low, and the original production process flow is not influenced.

The application discloses a preparation method of a fluorinated antimony-doped passivated lead sulfide quantum dot active layer, and the preparation method comprises the following steps: preparing an iodine-bromine-wrapped lead sulfide colloidal quantum dot film; dissolving fluorinated antimony in acetonitrile to obtain a fluorinated antimony acetonitrile solution; soaking the iodine-bromine-wrapped lead sulfide colloidal quantum dot film in the fluorinated antimony acetonitrile solution; and washing the iodine-bromine-wrapped lead sulfide colloidal quantum dot film with acetonitrile for a preset number of times to obtain a fluorinated antimony chemical reaction-doped passivated lead sulfide quantum dot active layer. The application can improve the overall performance of a semiconductor device containing an active layer.

The invention relates to the field of lead flash smelting in pyrometallurgy, and discloses a flash lead smelting process matched with treatment of copper concentrate, which comprises the following steps: mixing copper concentrate and lead concentrate for flash smelting, and forming a lead-copper mixed melt after oxidation and reduction reaction; adding a vulcanizing agent to liquate and remove copper by utilizing the principle that the solubility of copper in the lead liquid is reduced along with the reduction of the temperature, so as to generate co-melt lead matte mainly comprising sulfides such as lead sulfide and copper sulfide; according to the process method, the mixed furnace charge containing 20-50% of lead and 0.5-5% of copper can be treated, a high-benefit lead matte product is directly produced in the flash lead smelting process, and a new benefit growth point is created for lead smelting enterprises.

The application discloses a long-time high-temperature-resistant lead sulfide colloidal quantum dot film and a preparation method thereof, and comprises the following steps: obtaining first PbS quantum dot solids, wherein the surface ligand of the first PbS quantum dot solids is a first ligand; dissolving the first PbS quantum dot solids in a first non-polar solvent to form a first PbS quantum dot solution; adding a mercaptan ligand into the first PbS quantum dot solution; obtaining second PbS quantum dot solids, wherein the surface of the quantum dots is the mercaptan ligand; dissolving the quantum dots with the mercaptan ligand on the surface in a second non-polar solvent to obtain a second PbS quantum dot solution; and spin-coating the second PbS quantum dot solution on a substrate to prepare a PbS colloidal quantum dot film; and the mercaptan ligand is one or a combination of mercaptoethanol (ME) or butanethiol. According to the application, mercaptoethanol (ME) or butanethiol is used as the PbS quantum dot solid ligand, the high-temperature-resistant mercaptan ligand is used to replace the high-temperature-unstable metal halide ligand, and the long-time high-temperature stability of the PbS quantum dot film is greatly improved.

The invention relates to the technical field of lead-zinc ore flotation, in particular to a method for flotation of lead concentrate from lead-zinc sulfide ore. In order to solve the problem of low dissociation degree of lead and zinc monomers in the first-time concentrated tailings of lead, the first-time concentrated tailings of lead and first-stage grinding and grading overflow ore pulp are mixed and then subjected to second-stage grinding and grading treatment, ore over-grinding is avoided, meanwhile, coarse-fraction returned sand and settled sand are returned to a ball mill to be ground again, and the separation degree of lead and zinc monomers in the first-time concentrated tailings of lead is improved. Therefore, the lead metal is prevented from circulating back and forth in lead roughing and lead first-time concentration in a middling mode, and lead and zinc are prevented from being gradually accumulated in the lead first-time concentration process and worsening the flotation process. After countercurrent grading and regrinding of the first-time lead concentrate tailings, coarse-grained minerals in the first-time lead concentrate tailings are ground to fine-grained minerals, lead-zinc intergrowth circulating back and forth in the lead roughing and first-time lead concentration processes is reduced, the concentration of the first-time lead concentrate tailings is reduced, the dissociation degree of lead and zinc monomers is improved, and the lead-containing grade of lead concentrate is improved.

An infrared sensor includes a substrate, a first electrode, a light-sensing unit, and a second electrode. The substrate is infrared-transmissible. The first electrode is disposed on a surface of the substrate and is infrared-transmissible. The light-sensing unit is disposed on a surface of the first electrode opposite to the substrate, is capable of absorbing and sensing infrared light, and includes a zinc oxide (ZnO)-based layer, a first lead sulfide (PbS)-based modification layer, and a second PbS-based modification layer that are sequentially stacked from the surface of the first electrode. The first PbS-based modification layer includes halide ion-modified PbS, and the second PbS-based modification layer includes thiol-modified PbS. In addition, the second electrode is disposed on a surface of the light-sensing unit opposite to the substrate, and is capable of forming a current flow path by cooperating with the light-sensing unit and the first electrode.

The application belongs to the technical field of neuromorphic computing devices, and particularly relates to a temperature programmable neuromorphic device based on lead sulfide colloidal quantum dots and application. The device comprises an insulating substrate, a planar gap electrode, a lead sulfide colloidal quantum dot photosensitive film and a temperature control module. By setting the working temperature to control the release kinetics of the trap state charge in the photosensitive film, the device has different photocurrent decay characteristics at different temperatures, realizing reversible switching of the fast detection and long-term storage modes. The device can be used for reservoir computing, and realizes time sequence information processing through the historical dependence response to time sequence light pulses. The application solves the problem of fixed and unadjustable response time scale of the existing device, and has the advantages of simple structure, good process compatibility and wide response dynamic range.

The invention relates to the technical field of industrial wastewater treatment, in particular to a lead smelting arsenic-containing wastewater treatment method which comprises the following steps: S1, crushing and fine grinding: carrying out ore grinding treatment on lead sulfide ore to obtain lead sulfide fine powder; s2, washing liquid rich oxidation treatment, wherein the washing liquid is subjected to micro-nano air or oxygen-enriched air oxidation treatment, and the end-point ORP value is controlled; s3, flue gas washing, wherein the flue gas is guided into a washing solution to be washed; s4, arsenic removal is conducted, specifically, the sulfur lead concentrate fine powder in the S1 is added into the oxygen-enriched washing liquid in the S2 for arsenic removal operation; s5, primary solid-liquid separation: carrying out solid-liquid separation on the solution subjected to arsenic removal in the step S3; s6, oxidation and neutralization: adding the solution obtained in the step S5 into an oxide intermediate product in the lead smelting process to carry out oxidation and neutralization reaction; and S7, secondary solid-liquid separation is conducted, specifically, liquid-solid separation is conducted on the ore pulp obtained in the step S6. The method provided by the invention can be used for solving the problems that the arsenic in the lead smelting arsenic-containing flue gas washing liquid is difficult to effectively remove and the arsenic cannot be subjected to centralized open-circuit treatment.

The application discloses a kind of lead sulfide quantum dots with adjustable light absorption range, preparation method and application thereof.Sulfur source is dissolved in short-chain amine solvent, lead source and organic small molecule ligand solution dissolved in organic polar solvent are added, and then sulfur source solution is added, and the reaction is stirred at a temperature of 0-100 DEG C to obtain a reaction product;anti-solvent is added, and the product is washed and dried to obtain lead sulfide quantum dots with uniform particle size and adjustable light absorption range.By adjusting the content of precursor, reaction solvent and temperature, and under the action of n-butylamine, PbS quantum dots with adjustable light absorption range are directly synthesized in one step, which solves the limitations of small light absorption range and low yield of quantum dot ink direct synthesis, and obtains quantum dots with a light absorption range of 1000nm-2000nm wavelength.The synthesized quantum dots have achieved preliminary application in photoelectric detector.

The present application relates to the technical field of sulfide lead-zinc ore dressing, and discloses an alkali-free ore dressing method for sulfide lead-zinc ore. The method comprises the following steps: grinding to obtain ore slurry; performing lead flotation on the ore slurry to obtain lead concentrate and lead tailings; adding pyrite depressant, zinc activator and zinc flotation collector into the lead tailings slurry to perform zinc flotation, and obtaining zinc concentrate and final tailings; wherein, in the process of lead flotation, the added lead flotation depressant is a mixture of lignosulfonate and zinc sulfate; in the process of zinc flotation, the added pyrite depressant is composed of trithiocarbonate containing a hydrophilic group and a sulfur-containing inorganic salt. The present application can realize alkali-free flotation of sulfide lead-zinc ore, avoid the disadvantages of high-alkali lime process, and improve the lead-zinc separation efficiency.

The present invention discloses a graphene / lead sulfide infrared detector and its preparation method. The graphene / lead sulfide infrared detector comprises a substrate, which is sequentially covered with a graphene film, a metal electrode, a lead sulfide seed layer, and a lead sulfide nanocrystal film layer. The graphene film is provided with one of the metal electrodes at each end. The present invention introduces a lead sulfide seed layer onto the surfaces of the graphene and metal electrodes, using the seed layer to assist in the growth of lead sulfide nanocrystals, resulting in a dense, smooth, uniform, high-quality lead sulfide nanocrystal film layer, ultimately realizing a highly responsive infrared detector.

The application discloses a method for removing heavy metal in oligotrophic environment by using semiconductor mineral reinforced microorganisms, which utilizes light energy to replace organic matter to drive sulfate-reducing bacteria metabolism to remove heavy metal ions. The sphalerite produced by microbial metabolism or natural sphalerite or chemically synthesized sphalerite is excited to produce photoelectrons under light conditions, and the sulfate-reducing bacteria with extracellular electron transfer capacity utilize the photoelectrons to carry out sulfate reduction metabolism to produce hydrogen sulfide, which reacts with heavy metal ions (such as lead ions) in wastewater to form heavy metal sulfide precipitates such as lead sulfide, so as to remove the heavy metal ions from the water phase. The method cooperatively utilizes light energy and chemical energy to efficiently treat heavy metal pollution, and simultaneously avoids problems such as secondary pollution, active sludge production and greenhouse gas emission in the treatment process, has low treatment cost, is environment-friendly, and has a wide application prospect.

The application discloses a galena combined inhibitor and a use method thereof, and the combined inhibitor comprises iron sulfate, sodium nitrate and jarosite, and the mass ratio of the amount of the iron sulfate, the sodium nitrate and the jarosite is 20:(4-10):(1-2). The combined inhibitor can be applied to separation of copper-lead mixed concentrate to realize lead inhibition and copper floating, and the combined inhibitor does not need to be removed. In an acid medium, after the combined inhibitor acts, not only can the combined inhibitor decompose the adsorbed reagent on the surface of the copper-lead mixed concentrate, but also can promote the galena surface to be oxidized to generate hydrophilic PbSO4 and PbO, while the chalcopyrite surface is oxidized to generate hydrophobic elemental sulfur (S 0 ), thereby expanding the floatability difference between the copper-lead sulfide, the jarosite is selectively adsorbed on the surface of the galena, further reducing floatability of the lead, and improving the copper-lead separation efficiency. The copper concentrate and the lead concentrate obtained by the application have high recovery rates, low mutual content, reusable acid liquid, low cost and environmental protection.