247 results about "Silver oxide" patented technology

The nano titanium oxide main body photocatalytic sterilization multi-element material provided by the invention comprises 85%-98% of a nano titanium oxide material, 2%-15% of a perovskite material and a modifier, the modifier comprises silver, silver oxide and graphene, and the modifier comprises a nano titanium oxide main body and a nano titanium oxide main body. The nano titanium oxide main body photocatalytic sterilization multi-element material can fully utilize the characteristics of a perovskite structure material, overcomes the defects of a nano titanium oxide material, improves the light utilization rate, inhibits carrier recombination, improves the antibacterial durability, can utilize ultraviolet light to carry out catalytic sterilization and can also utilize ions to carry out sterilization, and the antibacterial effect is good. Sterilization can be achieved through the photolysis reaction of visible light, the synergistic composite sterilization effect is achieved, harmful germs are rapidly and effectively killed, the environment is kept fresh and safe, and the comprehensive sterilization and deodorization effect can be achieved by adding the modifier; the preparation method of the nano titanium oxide main body photocatalytic sterilization multi-element material provided by the invention is simple in steps, convenient to operate and easy to implement.

The invention provides a silver paste composition and a preparation method and application thereof. The silver paste composition comprises the following components in parts by weight: 80-120 parts of silver-containing filler, 20-40 parts of an organic solvent, 5-15 parts of a non-noble metal auxiliary agent with an atomic number of 24-30, 8-10 parts of a peroxide organic auxiliary agent and 1-5 parts of a rheological agent, the silver-containing filler comprises elemental silver powder and a silver-containing compound, and the weight ratio of the elemental silver powder to the silver-containing compound is (18-20): 1; the elemental silver powder comprises micron-scale silver powder and nano-scale silver powder; the silver-containing compound is selected from one or more of silver carbonate, silver lactate, silver formate, silver citrate and silver oxide. According to the low-temperature pressure sintered silver paste composition, low-temperature and low-pressure sintering of the silver paste composition is achieved by adding nano-scale and micron-scale silver powder, a metal precursor, a non-noble metal auxiliary agent and the like.

The invention provides a defective catalyst as well as a preparation method and application thereof. The defective catalyst comprises a defective titanium dioxide carrier and a metal oxide active center loaded on the defective titanium dioxide carrier, the metal oxide active center comprises silver oxide; the defect catalyst has high specific surface area and high catalytic activity and can be used for catalytically degrading N-VOCs and cooperatively producing NH3, the conversion rate of N-VOCs is preferably up to 98.0% or above, and meanwhile, the yield of NH3 is preferably up to 100%; the efficient degradation of the N-VOCs and the green resource utilization of the nitrogen resource of the N-VOCs are realized.

The invention discloses a degradable polymeric flocculant and application thereof.The preparation method specifically comprises the following steps that sulfonated starch is dissolved in deionized water, chitosan composite powder is added, the mixture is heated and stirred until the chitosan composite powder is dissolved, acrylamide is added after ultrasonic dispersion, then N, N '-methylene bisacrylamide and potassium persulfate are added, the mixture is stirred until a gel state is formed, and the degradable polymeric flocculant is obtained; cutting the gel into small blocks, soaking the small blocks in distilled water for washing, and drying, crushing and sieving the washed gel to obtain the degradable polymeric flocculant. According to the preparation method, the flocculation capacity and the degradation capacity are improved by compounding synthesized organic polymer and natural polymer materials, the antibacterial capacity and the degradation performance are improved by compounding silver oxide, titanium oxide and graphene oxide, and the composite material is good in flocculation and sedimentation capacity, excellent in degradation performance and good in antibacterial capacity.

The invention provides a graphene-based hydrogen sulfide gas sensor and a preparation method thereof, and relates to the technical field of gas sensors. The preparation method of the graphene-based hydrogen sulfide gas sensor comprises the following steps: soaking the wood substrate in a mixed metal salt solution containing a water-soluble silver salt and a water-soluble transition metal salt; irradiating the soaked wood substrate by using a laser beam at room temperature under the condition of no shielding gas, so that lignin and cellulose in the wood substrate are cracked and reconstructed to form graphene; meanwhile, the mixed metal salt immersed in the wood substrate is decomposed to form bimetallic oxide nanoparticles including silver oxide nanoparticles and transition metal oxide nanoparticles, and the bimetallic oxide nanoparticles are dispersed on the surface of each layer of graphene to obtain a sensitive layer; and coating conductive materials on the wooden substrate and on the two sides of the sensitive layer to form a connecting electrode in contact with the sensitive layer, thereby obtaining the graphene-based hydrogen sulfide gas sensor.

The invention discloses high-performance silver paste added with nano silver oxide and a preparation method of the high-performance silver paste. The high-performance silver paste comprises the following components: an organic carrier, glass powder, silver powder and an additive, the organic carrier comprises a volatile solvent and non-volatile resin; the non-volatile resin comprises ethyl cellulose, nitrocellulose, acrylic resin, polyamide wax resin and hydrogenated castor oil; the volatile solvent comprises texanol, diethylene glycol monobutyl ether, diethylene glycol monobutyl ether acetate, tributyl citrate, dimethyl oxalate and dimethyl silicone oil; the additive adopts nano silver oxide. The invention relates to the technical field of solar cells. Compared with silver powder, the nano silver oxide is smaller in particle size, large in specific surface area and low in tap density, the viscosity can be improved when the nano silver oxide is added into the paste, the height-width ratio of a printing grid line electrode can be improved, the shading area can be reduced, the current of a battery piece can be improved, and the photoelectric conversion efficiency of the battery piece can be improved.

The invention provides a preparation method of a catalyst for synthesizing indole, which comprises the following steps: sequentially impregnating silicon dioxide in a manganese salt solution, a first alkali solution, a silver nitrate solution containing an auxiliary agent M and a second alkali solution by adopting an impregnation method, standing for 0-72 hours at the temperature of 0-50 DEG C during each impregnation, and drying for 0-72 hours at the drying temperature of 20-290 DEG C after each standing, the auxiliary agent M is any one or more of aluminum nitrate, zirconium nitrate, lanthanum nitrate and cerium nitrate. Manganese dioxide is used as an anchor point, so that silver oxide is effectively dispersed and anchored on the surface of a silicon dioxide carrier modified with manganese dioxide; and finally, a nitrate auxiliary agent with the atomic radius larger than that of silver atoms is added and used for inhibiting the rate of increasing the particle size of the silver particles due to agglomeration of the silver particles caused by high-temperature sintering. The preparation process does not involve treatment at 300 DEG C or above and roasting treatment, and the preparation method is simple in step.

The invention relates to the field of building materials, in particular to nano-silver solder paste with high welding strength and a preparation method of the nano-silver solder paste. The nano-silver tin paste with high welding strength comprises the following raw materials: nano-silver powder, nano-tin powder, composite resin, a dispersing agent, an activating agent, a film-forming agent, a thixotropic agent, silicon-titanium particles, a stabilizing agent and the like. According to the nano-silver solder paste with the high welding strength and the preparation method thereof, uniform dispersion of an internal system is achieved, the welding effect and the welding performance are further optimized, the oxidation resistance can be greatly improved, the probability that high surface energy of nano-silver is prone to being oxidized to generate silver oxide is greatly reduced, and the welding quality of the nano-silver solder paste is improved. The silver solder paste prepared by the method further balances the balance between the preparation process and the high strength of the silver solder paste, and has excellent stability and mechanical strength, thereby meeting the requirements of high-reliability packaging in the prior art, and having wide application potential.

The invention discloses bacteriostatic and antibacterial lithium disilicate glass ceramic and a preparation method thereof. The bacteriostatic and antibacterial lithium disilicate glass ceramic comprises the following components in percentage by weight: 60-70% of lithium disilicate whiskers, 5-12% of a nucleating agent, 1-5% of aluminum oxide, 1-4% of calcium oxide, 5-10% of an antibacterial agent and 12-18% of fluorapatite, wherein the nucleating agent is formed by compounding phosphorus pentoxide and zirconium oxide, and the antibacterial agent is formed by compounding silver oxide and zinc oxide; the invention relates to the technical field of lithium disilicate glass ceramics. In the glass ceramic, silver ions can be combined with groups such as sulfydryl and amino in bacterial cells to interfere the metabolic process of bacteria and inactivate enzymes of the bacteria so as to inhibit growth and reproduction of the bacteria, and zinc ions can influence permeability of bacterial cell membranes and destroy physiological functions of the bacteria and cooperate with the silver ions to enhance the antibacterial effect of the glass ceramic.

The invention discloses a 6N high-purity silver raw material for a target material and a preparation method thereof.The preparation method of the 6N high-purity silver raw material for the target material comprises the following steps that 4.5 N silver is placed in a vacuum intermediate frequency furnace to be smelted, and an anode plate is prepared; silver nitrate is purified through a crystallization method and a silver oxide purification method, and high-purity silver nitrate is obtained; the anode plate is loaded into a ceramic membrane, the high-purity silver nitrate is taken to be prepared into an electrolysis mother solution, then the anode plate loaded into the ceramic membrane serves as an anode, titanium-coated silver serves as a cathode, the electrolysis mother solution serves as an electrolyte, and electrolysis is conducted to prepare high-purity silver powder; and the high-purity silver powder is placed in a graphite crucible to be subjected to vacuum melting and then poured into a graphite mold, and the 6N high-purity silver raw material for the target material is prepared. According to the 6N high-purity silver raw material for the target material and the preparation method of the 6N high-purity silver raw material, the purity and stability of the 6N high-purity silver raw material are improved on the basis of guaranteeing the purity of the 6N high-purity silver raw material through combination of various modes such as raw material optimization, equipment optimization and process step improvement.

The invention discloses a mechanochemical synthesis method of an N-heterocyclic carbene metal assembly, and relates to the technical field of chemical synthesis. The method comprises the following steps: mixing N-heterocyclic carbene precursor salt, silver oxide and alkali, adding grinding balls, and carrying out ball milling; and dissolving in a solvent, centrifuging, concentrating under reduced pressure, adding into a precipitant, centrifuging and drying in vacuum to obtain the N-heterocyclic carbene metal assembly. The method is used for synthesizing various types of metal supramolecular assemblies through one-pot ball milling under the condition of no solvent at the ambient temperature, and is carried out under the condition that the method is simpler and milder than other synthesis processes, and the yield is higher. Compared with harsh reaction conditions of a solution method, the solid ball milling method is simple and convenient to operate and rapid in reaction, and generation of by-products formed by AgI ions and a polar solvent is avoided. The problems that in the prior art, the reaction condition for preparing the N-heterocyclic carbene metal assembly is harsh, and by-products are likely to be generated are solved.

The invention relates to the technical field of concrete, and discloses high-strength concrete and a preparation method thereof. The concrete comprises the following components: 800 to 850 parts of cement, 150 to 160 parts of glass beads, 100 to 120 parts of mineral powder, 80 to 100 parts of silica fume, 900 to 950 parts of fine aggregate, 8 to 10 parts of a water reducing agent, 10 to 15 parts of chitosan, 20 to 25 parts of acrylamide, 1 to 2 parts of an initiator, 5 to 6 parts of a coupling agent, 1 to 2 parts of a cross-linking agent, 1 to 2 parts of nano silver oxide, 200 to 210 parts of water and 50 to 60 parts of an acetic acid solution. Chitosan and acrylamide are copolymerized to obtain a polyhydroxy copolymer with a three-dimensional network structure, so that the strength of the concrete is improved; the nano silver oxide is loaded on the three-dimensional network copolymer, the nano silver oxide has excellent antibacterial performance, polyhydroxy on the copolymer structure has good oxidability and reducibility, and the antibacterial ability of the silver oxide is synergistically promoted. The concrete prepared by the preparation method disclosed by the invention keeps high strength while having excellent antibacterial ability.

The invention discloses a preparation method of nano silver oxide aggregate particles, low-temperature conductive silver paste and a preparation method of the low-temperature conductive silver paste. The preparation method of the aggregate particles comprises the following steps: preparing a silver salt solution, mixing an alcoholic solution with an alkali solution to prepare a mixed solution, then gradually dropwise adding the silver salt solution into the mixed solution for reaction, and filtering and drying a product to prepare the aggregate particles. The nano silver oxide aggregate particles are simple to prepare, a small amount of alcohol is added in the synthesis process, and hydroxyl is contained in the molecular structure of the alcohol and can wrap the surfaces of a plurality of small particles, so that connection among the small particles is enhanced, and the silver oxide aggregate is formed. The uniqueness of the morphology is that the reduction temperature of the silver oxide can be greatly reduced, and feasibility is provided for low-temperature sintering of the conductive paste containing the silver oxide. And the addition proportion of silver oxide and silver particles in the conductive silver paste is regulated and controlled to obtain a paste formula with excellent performance. The conductive paste composed of the nano silver oxide and the nano silver shows excellent conductive performance at low temperature.

The invention relates to the technical field of comprehensive recovery and resource utilization of gold dressing and smelting, in particular to a method for comprehensively recovering valuable elements by resource utilization of roasting cyanidation tailings. Comprising the following steps: S1, acidifying and curing the roasted cyanidation tailings; s2, carrying out high-acid leaching on the acidified and cured filter cake; s3, recovering gold, copper and iron; s4, roasting the high-acid acid leaching residues and the copper-zinc-silver oxide ore; s5, recovering copper and zinc from the roasted ore; and S6, gold and silver are extracted from the copper-zinc acid leaching residues. Valuable elements in the roasting cyanidation tailings are efficiently recycled and utilized, high-value utilization and clean production of resources of the roasting cyanidation tailings are achieved, the technical problem that the valuable elements in the roasting cyanidation tailings are difficult to effectively recycle is solved, the technological process is smooth, operability is high, the environment is good, and the method is suitable for industrial production. The method has remarkable economic benefits, social benefits and environmental benefits.

The invention discloses high-transmittance wear-resistant antibacterial dry granules, glaze, a ceramic tile and a preparation method thereof, and belongs to the technical field of building materials. The high-transmittance wear-resistant antibacterial dry granules are prepared from the following raw materials in parts by mass: 15 to 25 parts of potassium feldspar, 12 to 20 parts of lithium feldspar, 6 to 12 parts of dolomite, 4 to 12 parts of calcined soil, 2 to 10 parts of corundum, 0.2 to 1.0 part of silver oxide, 0.2 to 1.0 part of tungsten trioxide, 2 to 6 parts of zinc oxide, 20 to 30 parts of cubic boron nitride and 5 to 15 parts of aluminum nitride. The high-transmittance wear-resistant antibacterial dry granules are obtained by firing raw materials at 1500-1600 DEG C, preserving heat for 30-60 minutes and then quenching, wherein water for quenching is circulating cooling water. A glaze layer and a high-transmittance wear-resistant ceramic tile prepared from the high-transmittance wear-resistant antibacterial glaze added with the high-transmittance wear-resistant antibacterial dry particles are good in transparency and color development and high in hardness and wear-resistant grade, and meanwhile, the glaze layer and the high-transmittance wear-resistant ceramic tile have the antibacterial performance.

The invention provides Low-E coated glass and a preparation method thereof, and relates to the technical field of coated glass. The magnetron sputtering process is adopted for film coating, when the transparent conductive oxide located on the lower layer relative to the silver layer is sputtered, the oxygen flux of sputtering gas is improved, free oxygen is preset in the transparent conductive oxide layer, the top graphite film protection layer is arranged, the hydrophobicity and corrosion potential of the film layer are improved, and the abrasion resistance is improved. Heat treatment is carried out after film coating, so that preset free oxygen is diffused to a silver layer, a silver oxide micro-oxidation layer is formed, uniform distribution of the silver layer is promoted, the roughness of an Ag layer is reduced, and conductivity and transmittance are synchronously improved; the graphite layer is oxidized and removed, and stains and slight scratches on the surface of the graphite layer are eliminated together. Under the influence of heat treatment, the dielectric layers are regularly arranged, so that the compactness and surface hardness of the film are improved.

The invention relates to a method for recovering silver and tungsten from silver-tungsten alloy waste, and belongs to the technical field of comprehensive recovery of precious metal secondary resources. According to the method, the silver-tungsten alloy waste is subjected to extrusion forming and placed in a titanium basket to serve as an anode, a stainless steel plate serves as a cathode, a [AgNH3] < + > solution serves as electrolyte, electrolysis is conducted, and silver powder and anode slime are obtained; the preparation method comprises the following steps: finely grinding anode slime, adding pure water and an oxidizing agent, slurrying, oxidizing metal silver particles in slurry into silver peroxide by virtue of oxidation reaction at the temperature of 60-80 DEG C, adding ammonia water to dissolve the silver peroxide, enabling the silver peroxide to form a silver-ammonia complex, enabling the silver-ammonia complex to enter a solution, and carrying out solid-liquid separation, so as to obtain a silver-ammonia complex solution and coarse tungsten powder; sequentially boiling and washing the coarse tungsten powder with a nitric acid solution and pure water, and drying to obtain high-purity tungsten powder; and adding a reducing agent into the silver-ammonia complex solution for reduction, carrying out solid-liquid separation, and washing and drying the solid to obtain reduced silver powder. Compared with a traditional process, the method is short in technological process, small in environmental pollution, high in metal recovery rate, low in cost and high in production efficiency.

Disclosed herein is a porous substrate having silver and optionally silver oxide and a silver sulfide coating. Also disclosed herein is a battery having a cathode, an anode, and a separator between the cathode and the anode. The cathode includes a substrate having silver and optionally silver oxide and a silver sulfide coating. Also disclosed herein is a method of submerging a substrate having silver and optionally silver oxide in a solution of elemental sulfur in dimethyl sulfoxide to form silver sulfide on the surface of the substrate.

The invention relates to the technical field of H01B1 / 16, in particular to modified glass powder for low-silver-content conductive silver paste and a preparation method and application of the modified glass powder. The silver-loaded modified glass powder at least comprises the following components: main glass powder, an alcoholic solution and silver-containing powder; the main glass powder at least comprises the following components in parts by weight: 1-10 parts of aluminum oxide, 15-20 parts of silicon oxide, 1-10 parts of zinc oxide, 40-65 parts of lead oxide, 10-30 parts of boron oxide, 10-15 parts of bismuth oxide and 1-5 parts of silver oxide, so that the requirements of low contact resistance, high open-circuit voltage and high photoelectric conversion efficiency of a battery at a lower sintering temperature by an LECO sintering technology are met; the conductive paste is suitable for conductive paste with lower silver content, and better battery performance is taken into account while the cost is saved.

The application discloses a heat-insulating and light-shielding curtain and a preparation method thereof, and relates to the field of curtains. The graphene oxide is first prepared into a hydrogel, and modified carbon black is added to improve the light-shielding performance of the curtain; then, silver carboxylate is generated by the reaction between silver oxide and the carboxyl in the hydrogel, so that the antibacterial effect of the curtain is improved; the hydrogel is then frozen and spun, and is woven to obtain an aerogel fabric layer; bamboo charcoal microsphere particles are added to a bottom glue layer, and form spherical protrusions with tin foil, so that the light can be reflected, and the light-shielding effect is improved; the main raw material of a surface glue layer is titanium dioxide modified polyurethane, which is rolled on the surface of the tin foil to further improve the light-shielding, heat-insulating and antibacterial performances; finally, electrostatic flocking is performed to obtain the curtain with the heat-insulating and light-shielding effects.

The invention belongs to the technical field of electrocatalytic carbon dioxide reduction catalysts, and discloses a silver-based catalyst suitable for fluctuating carbon dioxide electrolysis and a preparation method of the silver-based catalyst. The preparation method comprises the following steps: uniformly and continuously dropwise adding a potassium hydroxide solution into a silver nitrate solution to prepare a silver oxide catalyst, and further applying a constant reduction current to the silver oxide catalyst in the presence of carbon dioxide gas for in-situ reduction to prepare the quintuple twin crystal silver-based catalyst. The preparation method disclosed by the invention combines precipitation titration and in-situ electroreduction methods, and has the characteristics of simplicity in operation, greenness, high efficiency and suitability for mass production; meanwhile, the catalyst can maintain high selectivity to carbon monoxide products in an extremely wide potential window range of 3V when being used in an electro-catalysis carbon dioxide conversion reaction, and is very suitable for being directly matched and coupled with fluctuating renewable energy sources.

The present application relates to the field of medicine synthesis, and discloses a preparation method and application of brominated piperonal carboxylic acid, wherein the brominated piperonal carboxylic acid compound is prepared from o-vanillin as a starting material through acetyl protection, bromination reaction, deprotection and demethylation reaction, cyclization reaction and Pinnick oxidation reaction.No longer through a brominated piperonal intermediate, and without using a live LDA reagent low-temperature lithiation reaction, the safety and stability are greatly improved.The deprotection and demethylation reaction is carried out in one pot, and the use of boron tribromide and other reagents is avoided;finally, the oxidation step from aldehyde to acid avoids using traditional silver oxide or potassium permanganate oxidation, and adopts Pinnick oxidation, which is economic, environmental protection and cost reduction, and greatly improves the yield.The whole has the advantages of easy-to-obtain raw materials, short steps, mild reaction conditions, low production cost, environmental protection, high yield and high purity, and can meet the high quality requirements of pharmaceutical products.

This invention discloses a biodegradable polymeric flocculant and its application, specifically comprising the following steps: dissolving sulfonated starch in deionized water, adding chitosan composite powder, heating and stirring until dissolved, ultrasonically dispersing, adding acrylamide, then adding N,N'-methylenebisacrylamide and potassium persulfate, stirring until a gel is formed, cutting the gel into small pieces and immersing them in distilled water for washing, drying, pulverizing and sieving the washed gel to obtain the biodegradable polymeric flocculant; this invention improves flocculation and biodegradability by combining synthetic organic polymers and natural polymeric materials, and enhances antibacterial ability and degradation performance by combining silver oxide, titanium oxide and graphene oxide, exhibiting good flocculation and sedimentation ability, excellent biodegradability, and good antibacterial ability.

The utility model discloses an electronic-grade reduction furnace silver composite board welding protection device which comprises a protection cover body, one side of the protection cover body is provided with an arc-shaped opening matched with an argon arc welding gun, the bottom of the protection cover body is provided with a fence, a perforated plate is arranged between the protection cover body and the fence, and the perforated plate is connected with the arc-shaped opening. An air inlet pipe communicated with the protective cover body is arranged on the protective cover body and is used for introducing inert gas. The surface of the silver composite board can be protected, and generation of various compounds, such as silver oxide and silver nitride, influencing the purity of the silicon material is effectively reduced.

Disclosed herein is a porous substrate having silver and optionally silver oxide and a silver sulfide coating. Also disclosed herein is a battery having a cathode, an anode, and a separator between the cathode and the anode. The cathode includes a substrate having silver and optionally silver oxide and a silver sulfide coating. Also disclosed herein is a method of submerging a substrate having silver and optionally silver oxide in a solution of elemental sulfur in dimethyl sulfoxide to form silver sulfide on the surface of the substrate.

The invention discloses a silver-loaded glass antibacterial agent as well as a preparation method and a product thereof, and silver oxide in the silver-loaded glass antibacterial agent accounts for 5-8wt% of the silver-loaded glass antibacterial agent with the surface thickness of 0-50nm and accounts for [r3-(r-0. 05) 3] / r3 * W of the whole silver-loaded glass antibacterial agent. According to the invention, aluminum oxide with a specific content and alkali metal ions such as sodium oxide and potassium oxide are introduced, so that the substrate glass without Ag2O is prepared, and through ion exchange, aging and yellowing of the resin caused by Ag2O are inhibited while relatively high Ag2O content of the surface is maintained. The Ag2O-containing antibacterial glass is prepared at a lower cost, and when the Ag2O-containing antibacterial glass is added into resin, the additive amount required for achieving the same antibacterial effect is lower, and the influence on aging and yellowing of the resin is smaller.

The invention discloses a liquid heavy metal reactor aerosol protective coating and a preparation method and application thereof, and the liquid heavy metal reactor aerosol protective coating comprises a polymer coating prepared from an acrylic monomer, an emulsifier, an initiator and an organic solvent; the hydrogel coating is prepared from acrylamide, acrylic acid, a cross-linking agent, a photoinitiator and ionic liquid with positive charges; the polymer coating and the hydrogel coating are loaded with nano silver oxide particles. The double-layer coating disclosed by the invention has a relatively good capturing effect on resettled aerosol in air after film formation. A solvent is fixed in the upper hydrogel coating, the solvent is released at a gel-aerosol interface, the surface is locally wetted, and the effects of covering, wetting, adhering, adsorbing and the like on resettled aerosol particles are facilitated.

The application discloses a method for comprehensive recovery and utilization of oxidized lead-tin-silver ore, which comprises the steps of pretreatment, oxidized lead flotation, mixed concentrate concentration, table operation and post-treatment. The oxidized lead-silver-tin is recovered through the combined process of flotation and gravity separation, and the process flow is simple, easy to operate, energy-saving, environment-friendly, and good in applicability. The obtained lead concentrate is high in lead grade and high in recovery rate, and tin and silver are comprehensively recovered and utilized in the form of various valuable minerals.

The present invention provides a method for producing silver nanoparticles, which can produce silver nanoparticles having a fine particle diameter with high production efficiency. One embodiment of the present invention is a method for producing silver nanoparticles, comprising: a raw material preparation step for preparing a silver oxide suspension containing a silver oxide and a solvent; and a silver nanoparticle formation step in which silver nanoparticles are formed by irradiating a suspension of a silver oxide with microwaves at an absorption amount in the range of 41-81 W / mL while flowing the suspension.

The invention provides low-temperature curing weldable conductive paste as well as a preparation method and application thereof, and belongs to the technical field of printed electronic materials. The weldable conductive paste comprises the following components by mass: 11-15% of an organic carrier; 70-85% of a conductive component; 0-19% of an organic solvent; the organic carrier comprises a rosin solution, epoxy resin and a latent curing agent; the conductive component is a micron silver sheet loaded with nano silver oxide; the length of the silver sheet is 1-15 [mu] m; the particle size of the nano silver oxide is 200 to 400 nm. According to the low-temperature cured weldable conductive silver paste provided by the invention, the wettability of the solder on the silver ink layer can be improved, so that the welding binding force is improved; and meanwhile, a silver ink layer printed by the paste has relatively high conductivity.