85 results about "Tin Element" patented technology

The invention discloses a plasma cleaning device and method. The plasma cleaning device comprises a base, a workpiece carrying plate and a protective cover, a positive electrode plate is arranged on the upper end face of the base, a ceramic plate is arranged on the upper end face of the positive electrode plate, a positioning piece is arranged on the upper end face of the ceramic plate, and a vacuumizing pipeline is arranged on the base; the workpiece carrier plate is provided with a plurality of positioning grooves for loading substrates to be cleaned, and the distance between the workpiece carrier plate and the ceramic plate is smaller than or equal to 0.05 mm; the protective cover is connected with a lifting mechanism and provided with a negative electrode plate, the negative electrode plate is located above the positive electrode plate, and the positive electrode plate and the negative electrode plate are located in the closed space. A ceramic plate is arranged on the positive electrode plate for covering, and a discharge mode is changed into a dielectric discharge mode, so that a golden finger of the substrate is prevented from being polluted by a tin element; according to the method, oxygen is input firstly to clean the surface of the substrate in a high-efficiency chemical reaction mode, then argon is introduced, the surface of the substrate is physically impacted, and surface oxides are thoroughly removed, so that the cleaning effect is better.

The invention discloses a preparation method of a Ni3Sn superconducting wire based on 3D printing. The preparation method comprises the following steps: depositing a reticular niobium film on the surface of a tin-titanium alloy rod through 3D printing to obtain a tin-titanium-niobium alloy rod; drilling a hole in the center of the tin-titanium-niobium alloy rod, and inserting a tin-silver alloy rod to obtain the tin-titanium-niobium-silver alloy rod; the tin-titanium-niobium-silver alloy bar is put into the Ni3Sn-copper-niobium composite tube, and then an internal tin method Ni3Sn sub-component is obtained; sequentially putting the internal tin method Ni3Sn subcomponents into the tantalum tube and the oxygen-free copper tube to obtain an internal tin method Ni3Sn blank; and stretching the inner tin method Ni3Sn blank to obtain the Ni3Sn superconducting wire. Due to the existence of the silver element, uniform diffusion of the tin element in the heat treatment process is facilitated, the netted niobium film is deposited on the surface of the tin-titanium alloy rod through 3D printing, the precision and quality of the niobium film are guaranteed, more high-quality Ni3Sn crystal grains can be generated in the heat treatment process of the wire, and the performance of the Ni3Sn wire prepared through the internal tin method is improved.

The invention relates to an iridium-ruthenium-tin composite catalyst and a preparation method and application thereof, the iridium-ruthenium-tin composite catalyst comprises an iridium element, a ruthenium element and a tin element, and an XRD spectrogram of the iridium-ruthenium-tin composite catalyst only has an amorphous peak packet within 25-40 degrees. Compared with a commercial iridium oxide catalyst, the iridium ruthenium tin composite catalyst disclosed by the invention has higher catalytic activity, the use amount of noble metal is remarkably reduced, the cost is reduced, and the use value is higher.

The invention relates to the technical field of chemical analysis, in particular to a chemical analysis method for rapidly measuring niobium and tantalum elements in high-tin ore, which comprises the following steps: preparing a to-be-measured sample melt: weighing a high-tin ore sample, and putting the high-tin ore sample into a corundum crucible containing sodium peroxide for pretreatment to obtain the melt; preparing a to-be-detected sample liquid; adding concentrated hydrofluoric acid and concentrated hydrochloric acid into the melt for acidification; the hydrofluoric acid with high complexing property is selected to replace tartaric acid to serve as a stable complexing agent of niobium and tantalum, the hydrochloric acid acidizes the alkali melt, the nitric acid serves as an oxidizing agent, and a large amount of tin element is removed according to the fact that the hydrochloric acid reacts with tin ions to generate metastannic acid precipitate. The niobium and the tantalum in the high-content tin ore are separated from a large number of tin matrixes, the test accuracy is guaranteed, the influence of the high-content tin matrix effect is avoided, the niobium and the tantalum in the high-content tin ore can be rapidly and efficiently measured, and the method has the advantages of being good in separation effect, high in recovery rate, good in precision and the like.

The invention discloses an ammoxidation catalyst and a preparation method and application thereof, the active component of the catalyst is represented by a general formula MoxBiaFebAcBdCeDfEgFhOy, A represents at least one element selected from the combination of a nickel element, a cobalt element, a manganese element, a zinc element and a cadmium element; b represents at least one element selected from the group consisting of magnesium, strontium and barium elements; c represents at least one element selected from a combination consisting of potassium, rubidium and cesium elements; d represents at least one element selected from the group consisting of a tungsten element, a vanadium element, a chromium element, a gallium element, a germanium element, a scandium element, an yttrium element, an indium element, a tin element, and an antimony element; e represents at least one element other than promethium element among lanthanide elements; f represents at least one element among platinum group elements. According to the present invention, the composition ratio of the active components of the catalyst is regulated according to the action mechanism of the metal catalyst, such that the comprehensive performance of the catalyst is improved, and the high trinitrile product yield and the low trinitrile yield material consumption are provided.

The invention belongs to the technical field of electrochemical rust removal, and discloses a preparation method and application of a tin-doped stability-enhanced lead dioxide electrode. According to the preparation method, the tin element is introduced into the electrodeposition liquid, and the modified lead dioxide electrode with high stability and high conductivity is obtained by effectively regulating and controlling the preparation conditions. The introduction of the tin element enables the surface of the electrode to be more compact, uniform and smooth, and the conductivity and stability of the electrode are effectively improved; the cathode material is suitable for electrochemical rust removal. The invention provides a method for using tin-doped lead dioxide as a cathode material in an electric rust removal process. According to the method, by optimizing cathode material selection, the electric rust removal efficiency is remarkably improved, and the service life of the electrode is prolonged. Compared with a traditional graphite cathode, the tin-doped lead dioxide cathode can better resist corrosion and maintain stable performance under high current density. According to the embodiment of the invention, the excellent performance of the tin-doped lead dioxide cathode in the electric rust removal process is shown.

The invention relates to a high-efficiency enrichment and recovery process for indium in an indium-containing acid solution, which comprises the following steps of: feeding an indium-tin-containing raw material into a top-blown furnace for smelting, and volatilizing most indium and entering a dust collection system along with smoke dust to obtain indium-containing top-blown furnace smoke dust; carrying out centralized treatment on the indium-containing top-blown furnace smoke dust in an electric furnace to obtain high-indium electric furnace smoke dust; then the high-indium electric furnace smoke dust is subjected to wet treatment, washing is conducted firstly, then sulfuric acid is used for leaching, an acid solution rich in indium, zinc, cadmium and a small amount of tin elements is obtained, and tin is enriched and recycled in the form of acid leaching residues and returned for tin smelting; neutralizing and precipitating the indium-containing acid solution with ammonia water to obtain indium precipitation slag and indium precipitation liquid; washing the indium precipitation residues with water to obtain washed indium residues and washing liquid, and drying the washed indium residues to obtain indium-rich residues. According to the method, indium, tin and other high-value metals can be efficiently separated from the zinc-cadmium slag with low consumption, efficient enrichment and recovery of indium and tin are achieved, zinc and cadmium are recovered in the form of zinc-cadmium slag, and comprehensive recovery and utilization of various valuable metals are achieved.

The invention discloses a combined determination method for the tin content of iron ore, which is characterized by comprising the following steps: drawing a calibration curve; selecting measurement parameters of an instrument; weighing a sample; sample melting: uniformly mixing the weighed sample with a mixed flux in a certain proportion, and melting in a muffle furnace; extracting a sample: extracting the fused sample by using hydrochloric acid, and fixing the volume for detection; and sample determination: determining by using an inductively coupled plasma emission spectrometer, determining the intensity value of each element by drawing a standard curve method, and calculating the final content of the element according to a calibration curve made by a standard solution. The invention aims to provide the combined determination method for the tin content of the iron ore, through experiments, the accuracy of determining the standard substance and the tin element of the tin-containing iron ore can be guaranteed, and through standard recovery experiments, the recovery rate is 95% or above. The method is used for production practice, and is an effective and practical method.

This invention provides a method for preparing a titanium-tin master alloy with tin segregation suppression and a cooling device. The preparation method includes: (1) pressing a molten blank; (2) smelting and refining to obtain an alloy melt; (3) casting and cooling: after turning on the cooling device, the alloy melt is poured into the cooling device, cooled, and then demolded to obtain a titanium-tin master alloy; the outer surface and the interior of the cooling device are equipped with water-cooling units. This invention utilizes the raw material structure of "titanium-tin core" to effectively reduce the occurrence of tin seepage in the crucible, reduce tin raw material loss, and improve the accuracy of alloy composition; combined with the cooling device to achieve internal and external synergistic cooling, it can effectively suppress tin atom diffusion, prevent the occurrence of tin element anti-segregation in the traditional smelting process, enhance the uniform distribution of tin element in the titanium-tin alloy ingot, and control the tin element content deviation in the titanium-tin alloy ingot within 2wt%.

The invention belongs to the field of catalysts, and in particular to a Cu-Sn bimetallic catalyst for electrolysis of water and a preparation method thereof. The preparation method comprises the following steps: a copper-containing precursor, a tin-containing precursor, a palladium-containing precursor, a spinning material and a solvent are mixed, electrostatic spinning, and the product of the electrostatic spinning is placed on a substrate for calcination to obtain a Cu-Sn bimetallic catalyst; wherein the molar ratio of the copper element in the copper-containing precursor, the tin element in the tin-containing precursor, and the palladium element in the palladium-containing precursor is (2-8): (2-8): (0-4); in electrolysis of water, the number of oxygen vacancies in the catalyst is increased by a specific amount of copper element and tin element, and the electrolysis reaction path of water is guided so that the catalyst has an excellent catalytic effect.

The invention relates to the technical field of commercial vehicle air compressor air cylinder bodies, in particular to an air cylinder body casting and a preparation method thereof.The air cylinder body casting comprises, by weight, 3.2%-3.45% of carbon element, 1.7%-1.9% of silicon element, 0.85%-0.9% of manganese element, 0.06%-0.08% of phosphorus element, 0.06%-0.09% of sulfur element, 0.45%-0.54% of copper element, 0.12%-0.20% of chromium element, 0.026%-0.040% of antimony element, 0.053%-0.061% of tin element and the balance iron element. The cylinder block casting has the advantages of high tensile strength and hardness, and the application range of the cylinder is effectively widened.

The invention provides a composite refining agent for impurity removal of scrap brass and application of the composite refining agent, and the composite refining agent comprises a Cu-Y intermediate alloy, a Cu-Ti intermediate alloy, a Cu-B intermediate alloy, an Mg-Ca intermediate alloy, lime, sodium carbonate, pyroborax, fluorite, sodium fluoride and cryolite. Aiming at the impurities of iron, lead, bismuth and tin in the yellow scrap copper raw material, the composite refining agent can effectively remove the impurities of iron, lead, bismuth and tin, the deoxidation capacity is high, slag is easy to clean, meanwhile, Y, Ti, B, Ca and the like serve as beneficial elements of an alterant, ingot casting grains can be effectively refined, the metallurgical quality of brass alloy is improved, and the service life of the alloy is prolonged. And the hot and cold processing properties and mechanical properties of the brass alloy are improved, so that the regeneration and cyclic utilization of the scrap brass are realized.

The invention relates to the technical field of aluminum alloy materials, in particular to a high-strength corrosion-resistant photovoltaic aluminum alloy frame profile and a preparation method thereof. The aluminum alloy comprises the following components in percentage by mass: 0.65 to 0.75 percent of Si, 0.60 to 0.68 percent of Mg, 0.01 to 0.05 percent of Mn, 0.01 to 0.05 percent of Cr, less than 0.15 percent of Fe, 0.02 to 0.045 percent of Ti, 0.06 to 0.08 percent of Cu, 0.18 to 0.22 percent of Sn and the balance of Al. Due to the addition of the tin element and the precise control of the contents of main alloy elements such as magnesium and silicon, the alloy disclosed by the invention shows higher strength, toughness and fatigue resistance, so that the alloy can keep higher structural stability and durability when bearing a complex stress environment, for example, a photovoltaic frame is used for a long time in an outdoor environment. And meanwhile, the aging time required for achieving the optimal mechanical property is remarkably shortened, and the method has important significance in the aspects of improving the production efficiency, reducing the production cost, reducing the energy consumption, achieving green production and the like.

The invention belongs to the technical field of hydrogen energy and fuel cell catalyst preparation, and particularly relates to a carbon-loaded palladium-tin intermetallic compound and a preparation method and application thereof. The preparation method comprises the following steps: dispersing palladium salt, tin salt and a carbon carrier in a solvent, ultrasonically mixing, heating until the solvent is evaporated, drying an obtained solid product, and grinding to obtain precursor solid powder; and heating and reducing the precursor solid powder in a reducing atmosphere to obtain the carbon-loaded palladium-tin intermetallic compound. By introducing low-melting-point and relatively-cheap metallic tin, not only can the formation temperature of intermetallic compounds be reduced and the energy consumption be reduced, but also more OH and CO adsorption and desorption sites can be provided by doping the tin element, the electro-catalytic activity and the CO poisoning resistance can be improved, and the preparation method is simple and easy to implement. The problems that hydrogen energy and fuel cell catalysts are poor in activity, the preparation method is tedious, and the CO poisoning resistance is poor are effectively solved.

The invention belongs to the technical field of soil and sediment detection, and particularly relates to a method for measuring the content of a tin element in soil and sediment, which comprises the following steps: S1, sample treatment; the method comprises the following steps: weighing a soil or sediment sample, adding an acid solution and ultrapure water, carrying out gradient heating digestion, and fixing the volume with acid after digestion to obtain a test solution; the method is different from a conventional four-acid digestion method, and digesting is carried out by using a diacid digestion method of nitric acid and hydrofluoric acid and a full-automatic graphite digestion method; s2, tin content determination: taking the test sample solution, injecting the test sample solution into an inductively coupled plasma mass spectrometer to obtain test data, and calculating the content of the tin element in the test sample solution according to the test data. The tin element is measured by combining the inductively coupled plasma mass spectrometer, the detection mode is matched with an optimized gradient heating and diacid full-automatic digestion method, the accuracy and reliability of a detection result can be guaranteed, and the method is suitable for accurate analysis of the tin element in soil and sediments.

The invention belongs to the technical field of superconducting wires, and particularly relates to a CuSnTi / Nb composite material for a Ni3Sn superconducting wire and a preparation method and application of the CuSnTi / Nb composite material. The preparation method comprises the steps that molten CuSnTi alloy liquid is cast into a mold where a niobium rod is fixed for heat preservation, then directional solidification is conducted, an obtained CuSnTi / Nb composite blank is subjected to heat treatment, and the CuSnTi / Nb composite material is obtained. The directional solidification technology is adopted for preparing the CuSnTi / Nb composite blank, the temperature gradient and the cooling rate in the solidification process are accurately controlled, tin element segregation can be effectively restrained, generation of brittle phases is reduced, the structure uniformity is improved, and a directional solidification structure is obtained, so that the plasticity of the alloy in the axial direction is improved, the ductility of the CuSnTi / Nb composite material is greatly improved, and the service life of the CuSnTi / Nb composite material is prolonged. The problem that in the process of preparing the Nb3Sn superconducting wire through a bronze method, the CuSnTi alloy is quick in work hardening and insufficient in plasticity, and consequently the core of the superconducting wire is broken is solved.

The present invention discloses a conductive Al-Cu-Sn-Er rare earth aluminum alloy and a processing method thereof, wherein the content of copper element in the rare earth aluminum alloy is 0.2-1.0wt%, the content of tin element is 0.1-0.8wt%, the sum of the content of tin element and erbium element is less than or equal to 1.0wt%, and the remainder is aluminum. The processing method is as follows: pure aluminum is smelted in an atmospheric environment by a medium frequency induction smelting furnace to obtain a pure aluminum melt; aluminum-copper master alloy, aluminum-tin master alloy and aluminum-erbium master alloy are sequentially added to the pure aluminum melt to obtain a mixed melt by smelting; the mixed melt is cast by a near-liquidus casting method to obtain an alloy ingot; the alloy ingot is subjected to a solid solution treatment to obtain an alloy billet; the alloy billet is subjected to alternating treatments of three rollings and three-stage aging. The present invention can solve the problem that the electrical conductivity and mechanical strength of the existing aluminum alloy cannot be combined.

The invention provides a low-stress high-surface IGBT (Insulated Gate Bipolar Translator) bottom plate copper material and a preparation method thereof, and belongs to the field of IGBT copper material preparation, and the low-stress high-surface IGBT bottom plate copper material comprises the following components in percentage by weight: 99.95-99.98% of copper element, 10-30 ppm of oxygen element, 30-50 ppm of iron element, 15-30 ppm of phosphorus element, 30-50 ppm of zinc element, 20-50 ppm of tin element and 20-40 ppm of nickel element. The contents of trace elements such as Fe, P, Zn, Sn and Ni in the IGBT bottom plate copper material are accurately controlled, and the oxygen content in the components is greatly reduced, so that the purity of the copper material is improved, the generation of impurity elements is reduced, the Vickers hardness of the obtained copper material is still larger than or equal to 90 HV after the obtained copper material is subjected to heat preservation for 30 minutes at 320 DEG C, and the IGBT bottom plate copper material with excellent mechanical performance is prepared.

The invention discloses a soldering tin testing machine special for a motor rotor, and relates to the field of soldering tin testing, the soldering tin testing machine comprises a conveying table, a testing mechanism, an image acquisition part and a detection module, the detection module is installed on the surface of the conveying table, the testing mechanism is arranged on one side of the conveying table, the image acquisition part is arranged on one side of the testing mechanism, and the image acquisition part is arranged on the other side of the testing mechanism. Wherein the conveying table is used for bearing the conveying work of a to-be-tested motor rotor subjected to soldering tin and bearing all functional parts and functional modules; the testing mechanism is used for dual continuous treatment of smoke collection and stability testing after tin soldering when tin soldering is carried out on the tin-soldered electronic rotor; the tin soldering smoke absorption and the strength test of the tin soldering element can be conveniently combined, the dual functions of the device can be automatically switched, the pollution in the test process is reduced, the abnormal condition in the tin soldering process is effectively recorded and tracked through the abnormal analysis and traceability of the detection module, and the source of a fault is quickly positioned through traceability analysis.

The invention discloses a method for simulating elimination of tin element and weakening of texture and forming performance of ultra-low carbon steel in a laboratory, which comprises the following steps: S1, smelting: taking industrial pure iron as a matrix, adding 0.01-0.03% by mass of Sn and 0.01-0.1% by mass of one or two rare earth elements of La and Ce, and smelting to obtain a cast ingot; s2, hot rolling is conducted, specifically, the cast ingot is subjected to hot rolling after being heated and subjected to heat preservation, coiling is conducted after rolling, and air cooling is conducted to the room temperature after coiling; s3, cold rolling is conducted, specifically, surface oxides of the coiled base body are removed, and cold rolling is conducted; and S4, recrystallization annealing is conducted, specifically, recrystallization annealing treatment is conducted on the base body obtained after cold rolling, and crystal grains in the base body obtained after recrystallization annealing are distortionless equiaxed crystal grains. The rare earth element and the element Sn are added to react with each other, segregation of Sn at the grain boundary is inhibited, and therefore the weakening effect of Sn on the ultra-low carbon steel texture and forming performance is relieved; the steel is subjected to large cold rolling reduction and subsequent recrystallization annealing treatment, and the final steel has a high {111} texture and a high plastic strain ratio.

The present application provides a modified electrolyte and a preparation method therefor, an electrode material, and a battery. The modified electrolyte comprises a basic electrolyte and metal particles attached to the surface of the basic electrolyte; the material of the metal particles comprises one or more of a nickel element, a copper element, a tin element, an iron element, a cobalt element and a precious metal element. According to the modified electrolyte provided by the present application, a specific solid electrolyte is used as the basic electrolyte, the surface of the basic electrolyte is modified with the metal particles, the electronic conductivity of the modified electrolyte is effectively improved by means of cooperation of the basic electrolyte and the metal particles, and the positive electrode material containing the modified electrolyte can simultaneously improve the effective transmission of ions and electrons, such that the battery having the positive electrode material has both low interface impedance and good electrochemical performance.

The invention discloses a gold purification method for gold-tin eutectic alloy waste. The method comprises the following steps: S1, dissolving; s2, first-time tin removal, wherein free tin elements are removed; s3, second-time tin removal is conducted, specifically, complex-state tin elements and impurity elements are removed; s4, tin is removed for the third time, and a trace amount of residual tin element is removed; and S5, gold reduction and purification. According to the method, tin elements in different forms (free state-complex state-trace residue) are removed in stages, copper powder replacement, hydrochloric acid boiling and washing and hydrolysis tin removal methods are combined, deep removal of tin in the gold dissolving solution is achieved, the purpose of efficiently separating and purifying high-purity gold from the gold-tin eutectic alloy waste is achieved, operation is easy, and complex equipment is not needed.

A solid electrolyte according to one aspect of the present invention contains the element lithium, the element phosphorus, an element M, the element sulfur, and an element X, wherein the element M is at least one selection from the group consisting of the element silicon, the element germanium, and the element tin, and the element X is at least one selection from the group consisting of the element bromine and the element iodine. In an X-ray diffraction diagram of the solid electrolyte obtained using CuKα radiation, a diffraction peak A is present in the range of diffraction angle 2θ = 20.1° ± 0.3°, a diffraction peak B is present in the range of diffraction angle 2θ = 29.4° ± 0.3°, and a diffraction peak C is present in the range of diffraction angle 2θ = 33.3° ± 0.3°. The ratio IC / IB in the X-ray diffraction diagram of the intensity IC of the diffraction peak C to the intensity IB of the diffraction peak B is at least 0.15. The X-ray diffraction diagram either does not have a diffraction peak in the range of diffraction angle 2θ = 24.9° ± 0.3° or has a diffraction peak D in the range of diffraction angle 2θ = 24.9° ± 0.3° with the ratio ID / IB of the intensity ID of the diffraction peak D to the intensity IB of the diffraction peak B being not more than 0.05.

The invention relates to the technical field of tin content detection, and particularly discloses a method for detecting the tin content in tin bronze electroplating liquid. The method comprises the following steps: accurately preparing a tin standard working solution with the concentration of 20-200mg / L according to gradient, detecting the tin standard working solution with each concentration through an atomic absorption spectrometer, determining the absorbance, and establishing a concentration-absorbance standard curve of the tin standard working solution; the method comprises the following steps: treating a to-be-detected tin bronze electroplating solution sample, measuring the absorbance of a to-be-detected sample solution, converting the tin element concentration in the to-be-detected sample solution on the basis of an established tin standard working solution concentration-absorbance standard curve, and further calculating the mass concentration of tin in the to-be-detected sample solution. The method has high accuracy, the adding standard recovery rate is 99.0-100.3%, the precision test RSD is far less than 5%, and the precision and accuracy of the detection result are far higher than those of the traditional detection method.

Provided are a composite electrode, and a light-emitting diode having the composite electrode and a preparation method therefor, relating to the technical field of semiconductors. The light-emitting diode comprises an epitaxial layer and the composite electrode. The composite electrode comprises an adhesion barrier layer and a solder layer sequentially stacked on the epitaxial layer; the solder layer comprises at least two solder sub-layers sequentially stacked; each solder sub-layer is a gold-tin alloy layer; in each solder sub-layer, the mass ratio of gold element to tin element increases progressively in the direction away from the adhesion barrier layer; and in two adjacent solder sub-layers, the maximum mass ratio of gold element to tin element in the solder sub-layer closer to the adhesion barrier layer is greater than the minimum mass ratio of gold element to tin element in the solder sub-layer farther from the adhesion barrier layer. The present disclosure can effectively improve the soldering and packaging reliability of the light-emitting diode.

The invention provides a composite brazing sheet, a preparation method thereof and a brazing body. The composite brazing sheet comprises a core material and a brazing filler metal layer arranged on the surface of at least one side of the core material, and a middle layer is arranged between the core material and the brazing filler metal layer. The middle layer comprises a low-melting-point phase; the melting point of the low-melting-point phase is not higher than 600 DEG C; the low-melting-point phase includes a magnesium element and at least one element selected from a bismuth element and a tin element. The composite brazing sheet provided by the invention is provided with the middle layer, and the middle layer forms a specific low-melting-point phase, so that oxide film breaking and wetting uniformity are improved, and formation of an effective welding seam is more facilitated, so that use of a brazing flux in a CAB brazing process is avoided, the problem of brazing flux residue is thoroughly avoided, and meanwhile, a good brazing effect is ensured.

The invention provides a chestnut-shaped silicon-tin-based composite negative electrode material as well as a preparation method and application thereof. The silicon-tin-based composite negative electrode material comprises 20%-32% of a silicon element, 40%-55% of a tin element, 10%-20% of a carbon element, 5%-11% of an oxygen element and 0.5%-1.5% of a nitrogen element. The silicon-tin-based composite negative electrode material is of a two-layer coated chestnut-shaped structure, the core is a silicon-tin-based material, and the first layer is a carbon nanotube doped carbon layer; the second layer is an amorphous nitrogen-doped carbon layer; and a cavity is formed between the first layer and the second layer. The silicon-tin-based composite negative electrode material provided by the invention meets one or more of the following effects and advantages: (1) the first-cycle discharge capacity is high; (2) the capacity retention ratio is high after 200 cycles; and (3) the internal resistance is small.

The invention provides a core-shell type catalyst as well as a preparation method and application thereof. The core-shell type catalyst comprises an inner core, and an inner coating layer and an outer coating layer which are sequentially coated on the surface of the inner core, the inner core comprises a nickel-cobalt oxide, the inner coating layer comprises a tin-doped iridium ruthenium oxide, and the outer coating layer comprises a titanium-based oxide. According to the catalyst, the nickel-cobalt oxide serves as an inner core, structural support is provided, electron transfer is assisted through Ni < 2 + > / Ni < 3 + > redox pairs, and the catalytic activity is improved; due to the introduction of the tin element in the inner coating layer, the d-band center of Ir / Ru is regulated and controlled, the intrinsic activity of OER is improved, and meanwhile dissolution and loss of precious metal are inhibited; and the outer coating layer is tightly combined with the inner coating layer by forming Ti-O-Ir bonding, so that the interface stability is further enhanced, effective physical protection and chemical anchoring are provided for the noble metal, and the loss path of the noble metal is doubly blocked. The catalyst synchronously realizes the improvement of catalytic activity and the enhancement of long-term durability.

The application provides a tin mineralization identification and sampling method fusing XRF and spectral data, and relates to the technical field of geological exploration and mineral exploration. The method comprises the following steps: tin element content distribution is obtained by adopting portable XRF to perform grid rapid scanning; the characteristic peak of altered mineral is identified by using a portable spectrometer at an abnormal point; XRF data and spectral data are fused; the boundary of a tin mineralization body is rapidly circled on site; and the geological logging and sampling are guided accordingly. The application implements forced sampling on the point which is not mineralized by naked eyes but is determined as mineralized by instruments, and fundamentally solves the technical problem of "logging without seeing and supplementing sampling with ore". The application can significantly reduce the ore leakage rate, improve the accuracy and efficiency of logging and sampling, shorten the exploration period, and can be popularized to the on-site exploration of other difficult-to-identify metal minerals.

The invention discloses a BDD modified electrode, a modification method and application of the BDD modified electrode in production of persulfate through electrocatalytic oxidation of sulfate. A BDD electrode is used as a substrate, and a SnO2 / Sb2O5 / CeO2 transition metal oxide catalytic layer composed of a tin element, an antimony element and a cerium element is deposited on the surface of the BDD electrode. The catalyst layer covers the diamond peak bottom concave end on the surface of the electrode, so that the hydroxyl free radical production capacity of the electrode is improved, the catalyst layer is combined more tightly due to a certain Sn: Sb ratio, the service life of the catalyst layer is prolonged by doping trace Ce, the electron transmission capacity is improved, and the oxidation capacity of the electrode is further improved. The catalyst layer is prepared through electrochemical linear voltammetry deposition, only metal ions and an inorganic system are used as electrolyte in the method, and synthesis conditions are environmentally friendly and easy to amplify. The BDD modified electrode provided by the invention is applied to production of persulfate, the FE content exceeds 84.5% under the 1M sulfate concentration of 30mA / cm < 2 >, and the FE content can reach 93% or above in a 3M sulfate system.