3242 results about "Precious metal" patented technology

The invention discloses a preparation process of a modified porous carbon material catalyst. The preparation process comprises the following steps: (1) mixing and calcining a biomass precursor and a template agent to prepare graded porous carbon; (2) low-frequency plasma pretreatment and high-frequency plasma fluorination modification are adopted; (3) introducing the pulse plasma into a nitrogen doping site; (4) spraying ionic liquid and activating H2 plasma to form a B / F co-doped layer; and (5) loading alloy nanoparticles such as PtRu through pulse electrodeposition. According to the obtained catalyst, biomass derived porous carbon serves as a carrier, a fluorine / nitrogen co-doped active layer is constructed on the surface of the carrier through multi-frequency plasma synergistic modification and ionic liquid auxiliary modification, superfine precious metal nanoparticles are loaded, the hydrogen evolution overpotential of the catalyst is smaller than or equal to 28 mV under the current density of 10 mA / cm < 2 >, the activity attenuation is smaller than 5% after 1000 times of circulation, and the catalyst has a good catalytic activity. The water electrolysis hydrogen production device is suitable for a large-scale water electrolysis hydrogen production device.

The invention provides a mineral leaching property analysis method, which belongs to the field of process mineralogy, and comprises the following steps: crushing and enriching a sample to be detected, and selecting single mineral particles to obtain target mineral particles; the preparation method comprises the following steps: coating a sample preparation grinding tool with epoxy resin glue, adding target mineral particles, and carrying out curing and grinding treatment to obtain a primary sample; cutting the primary sample, placing the grinding surface downwards and the three wear-resistant alloys at the bottom of a sample preparation grinding tool, injecting epoxy resin glue, curing to form a composite sample, accurately grinding, polishing, performing carbon spraying treatment, performing first automatic mineralogical analysis, measuring the area of a target mineral, cleaning, and performing leaching treatment to obtain a treated sample; and after solidification, accurate grinding and polishing and carbon spraying treatment, secondary automatic mineralogical analysis is carried out, the area of the residual target mineral is measured, and the leaching index of the target mineral is calculated. Reliable technical support is provided for mineral processing technology optimization and resource evaluation, and the method is particularly suitable for development of efficient leaching technologies of precious metal, rare earth and the like.

The invention discloses a gas sensing material based on Ag / Pd-LaFeO3 and application of the gas sensing material in detection of hydrogen sulfide gas in municipal sewage, and relates to the technical field of gas sensing materials. The chemical formula of the gas sensing material based on Ag / Pd-LaFeO3 is X wt% of Ag-Y wt% of Pd-LaFeO3, wherein 0 lt; x < = 5, 0lt; y < = 5. According to the invention, on the basis of LaFeO3, the humidity interference resistance of the gas sensing material based on Ag / Pd-LaFeO3 can be improved through double noble metal surface modification of Ag and Pd. In addition, through double noble metal doping of Ag and Pd, the response sensitivity and selectivity of the prepared gas-sensitive material to H2S gas can be improved, and the working temperature of the gas-sensitive material is reduced. Specifically, at the working temperature of 110 DEG C, the response value of the prepared double noble metal modified LaFeO3 to 1ppm H2S gas is 46.16.

The invention belongs to the technical field of rare and precious metal recovery, and particularly relates to a method for recovering metallic silver from waste crystalline silicon battery pieces, which comprises the following steps: (1) putting the waste crystalline silicon battery pieces into an inorganic alkali aqueous solution for soaking reaction to obtain an aluminum-containing solution and dealuminized crystalline silicon pieces; (2) adding the dealuminized crystal silicon wafer into a mixed solution of organic acid and hydrogen peroxide for soaking reaction, filtering and washing to respectively obtain silver-containing filtrate and a silver-removed silicon wafer; (3) carrying out chlorination precipitation reaction on the silver-containing filtrate and a chlorine source, filtering and drying to obtain silver chloride powder; (4) adding silver chloride powder into an ammonia water solution, heating and stirring to completely dissolve silver chloride to obtain a silver-ammonia solution; (5) adding PVP (Polyvinyl Pyrrolidone) into the silver-ammonia solution, heating and stirring until the PVP is completely dissolved, adding ascorbic acid, and carrying out reduction reaction at room temperature to obtain metal silver powder precipitate; and filtering, washing and drying the precipitate to obtain the spherical silver powder. According to the method, the silver recovery efficiency is high, the spherical nanoscale silver powder can be prepared, and the purity is high.

The invention discloses a method for preparing fuel from waste polyolefin through noble-metal-free low-temperature aromatization, which comprises the following steps: in the atmosphere of synthesis gas, carrying out catalytic cracking on polyolefin serving as a raw material by adopting a binary mixed catalytic system to obtain aromatic hydrocarbon; the binary mixed catalytic system comprises Zr-ZnO and a molecular sieve; the catalytic cracking temperature is less than or equal to 300 DEG C. According to the low-temperature aromatization method disclosed by the invention, methanol is generated in situ through the synthesis gas, and the methanol and olefin generated by polyolefin cracking are subjected to Prins reaction, so that the aromatization reaction can be realized at the pyrolysis temperature far lower than that in the prior art, precious metals are not needed, the additional value and the application range of a plastic recovery product are greatly enhanced, and the method is suitable for industrial production. And the cost of the recovery process is reduced.

The invention discloses a method for recovering a silicon wafer and precious metal silver in a decommissioned crystalline silicon photovoltaic panel, which comprises the following steps of: 1, mechanically disassembling and pyrolyzing the decommissioned photovoltaic panel to obtain a crystalline silicon battery piece; 2, preparing molten salt, and heating the molten salt to melt the salt; and step 3, placing the crystalline silicon cell in molten salt, carrying out selective etching separation, taking out the crystalline silicon cell after etching is finished, and washing with water to obtain a silicon wafer and a silver wire. According to the method, the melting temperature of the used fused salt is low, silver and silicon in the photovoltaic panel can be separated in a targeted mode, the fused salt does not react with substrate silicon and silver wires on the surface, the high recovery efficiency of silver and silicon is guaranteed, meanwhile, environmental pollution caused by silver and silicon in the recovery process is reduced, on the basis, silver and silicon can be obtained through one-step separation and recovery, and the method is suitable for industrial production. The method has the advantages of simple operation, short process, environmental friendliness and the like.

Described herein are methods, devices, materials, and systems for extracting target materials from iron-rich feedstocks. The iron-rich feedstock may be red mud, a natural occurring mineral, and / or a waste stream. The target materials may include a main constituent of the feedstock, a rare earth element, a precious metal, and / or a platinum group element. The invention may use a combination of electrochemical reactions and physical separation methods.

A system and associated method and service for providing a platform that enables members to transfer, receive, or otherwise exchange cash in various international denominations and commodities, such as precious metals (e.g., gold, silver, etc.), in a mobile highly secured telecommunications environment. The system is capable of delivering cash instantly between two or more users by allowing the exchange of secure transactions between system and cash dispensing machines (ATMs). Users may pay, receive, exchange, deposit, transfer, pay bills, exchange currency, retrieve cash, deposit cash and create accounts based on the mobile phone number or a system generated code.

The invention discloses a carbon nitride-based composite material as well as a preparation method and application thereof. The carbon nitride-based composite material comprises a non-metal doped carbon nitride carrier and a noble metal, wherein the noble metal exists in the carrier in an element doping form and / or is loaded on the carrier in an oxide form; the precious metal is one or more of Pt, Pd, Au and Ru, and the nonmetal is one or more of P, S and I. According to the carbon nitride composite material disclosed by the invention, noble metal is utilized to modify carbon nitride, the number of surface active sites is increased, the electron and chemical structures of an active center are adjusted, and meanwhile, generation and migration of photo-generated charges are promoted. Meanwhile, the surface of the carbon nitride composite material is modified by non-metallic elements, so that adsorption and activation of reactant H2O molecules are effectively promoted. The catalyst disclosed by the invention is simple in preparation process, good in repeatability and easy for large-scale production.

The invention discloses a high-bismuth slag and precious lead co-processing and efficient recycling method, and belongs to the technical field of non-ferrous metallurgy. High-bismuth slag and precious lead are mixed to obtain impurity-removed precious lead through impurity removal processes such as plug-blow antimony removal, liquation copper removal and tellurium removal by adding agents, and the impurity-removed precious lead is subjected to an oxidation refining process to obtain gold-silver alloy to recover precious metal. Bismuth and lead are similar, silver can be infinitely dissolved in a molten state, and the silver trapping agent has good silver trapping capacity. The high-bismuth slag and the precious lead are mixed to greatly reduce the temperature of a system, volatilization and unknown loss of metal such as Ag are reduced, energy consumption is remarkably reduced, the production cost is reduced, the recovery rate of metal such as bismuth, antimony and silver is increased, and the production efficiency is improved. The obtained molten slag is used for smelting high-bismuth slag, the obtained soot is used for smelting crude antimony, and efficient cyclic utilization of rare and precious metal resources is achieved.

The invention belongs to the field of micro-nano structures, and relates to a preparation method of a nano needle tip split ring 3D structure periodic array. According to the method, after a reflecting layer and a supporting layer are deposited on a silicon substrate, polystyrene nanospheres are self-assembled, the volume of the nanospheres is reduced through reactive ion etching, then two times of inclined magnetron sputtering are carried out, deposited precious metal is etched through a reactive ion etching machine, and the silicon substrate is obtained. And removing the nanosphere mask to obtain the 3D structure periodic array of the nanotip split ring. The method has the characteristics of simple preparation process, good uniformity, high order degree and strong repeatability, and has wide application potential in the fields of SERS (Surface Enhanced Raman Scattering), photoelectric property detection and the like.

The invention discloses a method for recovering nearly all elements in low-precious-metal zinc replacement powder, which belongs to the technical field of non-ferrous metal wet smelting, and comprises the following steps: preparing zinc replacement powder, oxidizing and leaching, extracting copper, preparing cuprous chloride, electrodepositing zinc in raffinate, extracting precious metal by using a gold extracting agent, extracting, reducing and smelting to prepare a gold ingot and a silver ingot, and dissolving by using sodium hydroxide. Preparing lead carbonate; carrying out oxidation acid leaching; replacing; and smelting bismuth. According to the technology for achieving recovery and high-value utilization of nearly all elements in the zinc replacement powder under the mild condition, the technology can be carried out at the normal temperature, the high-pressure condition does not need to be provided, the zinc replacement powder is leached through the acid solution, then various valuable metals are selectively extracted from the leaching solution, corresponding downstream products are prepared, and the method is suitable for industrial production. The method realizes value maximization, does not generate secondary pollution, does not introduce fluorine, has low requirements on equipment, is simple in process and easy to operate, and makes up for the defects of the zinc replacement powder treatment process in the prior art.

The invention belongs to the technical field of chemical catalysis and chemical engineering, and discloses an oxygen carrier for preparing ethylene through oxidative dehydrogenation of chemical chain ethane as well as a preparation method and application of the oxygen carrier. Comprising a main component CeO2 and loading components V and Ru, specifically, the V and the Ru are loaded on the CeO2 in a step-by-step impregnation mode, and according to the mass percent of the CeO2, the Ru accounts for 2.00%, and the V accounts for 1.00%-5.00%. The key problems that a traditional ethane dehydrogenation technology is high in dependence on precious metal, prone to sintering at high temperature, frequent in regeneration and the like are solved, and an innovative solution is provided for low-carbon efficient ethylene production.

The invention provides corrosion-resistant 960MPa-grade high-strength steel. The corrosion-resistant 960MPa-grade high-strength steel comprises the following chemical components in percentage by mass: 0.07 to 0.13 percent of C, 0 to 0.1 percent of Si, 0.4 to 0.68 percent of Mn, 0.025 to 0.045 percent of P, less than or equal to 0.010 percent of S, 0.015 to 0.04 percent of Als, 0.03 to 0.06 percent of Ti, 0.001 to 0.003 percent of B, 0.1 to 0.4 percent of Cu and the balance of Fe and impurities. The invention further discloses a machining method of the corrosion-resistant 960MPa-grade high-strength steel. The Cu-P composite adding technology is innovatively adopted to replace traditional precious metal, and the alloy cost is remarkably reduced on the premise that the corrosion resistance is guaranteed. Compared with high-strength steel containing precious metal such as Mo in the prior art, the material cost can be reduced, and the strict requirement of the engineering machinery industry for economical efficiency is met.

The invention discloses a gas-sensitive material based on double noble metal doped holmium iron oxide and application of the gas-sensitive material to detection of hydrogen sulfide in a sulfur-containing ore body exploration environment, and relates to the technical field of gas-sensitive materials. HoFeO3 is used as a substrate material, and two elements of Au and Pt are used for doping modification of the HoFeO3 to prepare the gas sensitive material based on double noble metal doped holmium iron oxide. Au and Pt are combined to perform doping modification on HoFeO3, a synergistic effect is achieved on improving the temperature stability of the gas-sensitive material, the sensitivity of the gas-sensitive material in a high-humidity environment can be improved, in addition, due to the synergistic catalysis effect of Au and Pt, an energy barrier of H2S adsorption reaction can be remarkably reduced, surface electron transfer and reaction activity are promoted, and the sensitivity of the gas-sensitive material in a high-humidity environment is improved. Therefore, the working temperature is reduced, the response value is improved, and the method is suitable for detecting hydrogen sulfide gas in a sulfur ore body exploration environment.

The invention discloses a Ti / IrO2-SnO2-SbO2 gradient active coating anode with low cost and high stability and a preparation process of the Ti / IrO2-SnO2-SbO2 gradient active coating anode. The gradient active coating is characterized in that the gradient active coating is composed of 3-5 layers, the total thickness is 5-15 microns, the thickness of each layer is 1-5 microns, the molar percentage content of iridium in a bottom layer is 0-5%, the sum of the molar percentage content of tin and antimony is 95-100%, the molar percentage content of iridium in a surface layer is 10-20%, the sum of the molar percentage content of tin and antimony is 80-90%, and the thickness of each layer is 1-5 microns. The molar percentage content of iridium from the bottom layer to the surface layer is sequentially increased from 2% to 10%, the molar percentage content of tin and antimony is sequentially reduced from 2% to 10%, and the total iridium loading amount in the gradient active coating is 0.05-0.2 mg / cm < 2 >. The preparation method comprises the three steps of titanium substrate pretreatment, precursor salt alcohol solution preparation and gradient active coating preparation. By adopting a gradient coating mode, the thermal stress between the coating and the titanium substrate in the preparation process is remarkably reduced, the consumption of noble metal is reduced, the oxygen evolution activity of the anode is improved, and the service life of the anode is prolonged. The method is simple to operate and low in cost, and has remarkable industrialization advantages.

Disclosed is a jewelry module in which each core module is formed by connecting each other in jewelry produced by processing precious metals. The jewelry module has a rotation bed having an axis of rotation formed so as to be centered on the joining axis of each core module. Additionally, an angle of rotation with a reduced distance away from the rotational movement of each core module by the presence of said axis of rotation is provided, and a connection bracket is centered on the axis of rotation, which grasps the rotation bed and enables one core module to be connected with the other core module.

The invention relates to economical corrosion-resistant 5Cr80 rare earth oil well pipe steel and a preparation method thereof, belongs to the technical field of corrosion-resistant oil well pipe steel for petroleum engineering, and aims to solve the problems that the cost is high due to addition of precious metals such as Mo and Ni in existing medium Cr steel, pitting corrosion is induced by inclusion of MnS, and a rare earth treatment process is unstable. The oil well pipe steel is prepared from the following chemical components in percentage by mass: 0.05 percent to 0.08 percent of C, 0.3 percent to 0.50 percent of Si, 0.80 percent to 1.5 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.0020 percent of S, less than or equal to 0.0020 percent of O, 0.0050 percent to 0.0350 percent of Ce, 4.5 percent to 5.5 percent of Cr, less than or equal to 0.035 percent of Al, 0.020 percent to 0.030 percent of V and the balance of Fe and inevitable impurities. The yield strength of the oil well pipe steel is larger than or equal to 580 MPa. The economical corrosion-resistant 5Cr80 rare earth oil well pipe steel which is low in cost and free of a Mo-Ni component system is used for replacing a traditional high-alloy pipe in a harsh oil and gas well environment containing high Cl <-> and CO2, and the economical corrosion-resistant 5Cr80 rare earth oil well pipe steel is suitable for batch production of corrosion-resistant oil well pipes of deep wells, ultra-deep wells and sulfur-containing and CO2-containing complex working conditions.

The invention relates to a method for preparing a KFI molecular sieve membrane by utilizing a secondary growth method, in particular to a method for preparing the KFI molecular sieve membrane through rapid induction under the conditions of no template agent, no fluorine medium and no heavy metal. According to the method for preparing the KFI molecular sieve membrane by adopting the seed crystal method under the condition of not using a template agent, fluoride and noble metal ions, the membrane synthesis time and the membrane application cost can be remarkably reduced, and the industrial application of the KFI molecular sieve membrane is promoted.

The invention discloses a preparation method of a molecular sieve coated noble metal-rare earth metal / TiO2 monolithic catalyst and application of the molecular sieve coated noble metal-rare earth metal / TiO2 monolithic catalyst in CO oxidation reaction, and relates to the technical field of industrial catalysis and waste gas treatment. The catalyst comprises a composite active component composed of noble metal and rare earth metal, a TiO2 carrier and a molecular sieve coating layer, wherein the composite active component composed of the noble metal and the rare earth metal is dispersed in the TiO2 carrier, and the TiO2 carrier is coated with the molecular sieve coating layer. The catalyst provided by the invention shows excellent catalytic performance and excellent sulfur poisoning resistance and heavy metal poisoning resistance in CO oxidation reaction, has good economical efficiency and long-acting stability, and provides an efficient and stable CO oxidation catalyst technical scheme for flue gas treatment in the iron and steel industry.

The invention discloses a coating and a method for recovering precious metals in a physical vapor deposition process. The coating mainly comprises a silver coating positioned on the lower layer and an organic silicon modified layer positioned on the surface of the silver coating. Before precious metal is recycled, the coating is prepared on the surface of the position where precious metal needs to be recycled in the physical vapor deposition process, after physical vapor deposition is completed, an adhesive tape is adopted to be pasted to the surface of the coating, and then the precious metal is stripped from the surface of the coating in a mode of tearing the adhesive tape; or scraping the surface of the coating by adopting a tool, so that the noble metal is stripped from the surface of the coating, and stripped noble metal chips are collected; and finally, the adhesive tape with the precious metal or the collected precious metal scraps are heated, and the precious metal is recycled from a heating product. According to the method, efficient stripping and efficient recycling of the precious metal can be achieved, the coating has no influence on physical vapor deposition equipment and the technological process, and the method is simple in technology, high in operability, environmentally friendly, free of pollution and high in economical efficiency when the precious metal is recycled and can be applied to the recycling process of the precious metal on a large scale.

The invention relates to the technical field of precious metal recovery, in particular to a process for separating precious metal from copper-nickel smelting waste, which comprises the following steps: crushing and grading the waste, adding a sulfuric acid solution containing etidronic acid, leaching, and washing, drying and crushing filter residues to obtain a pretreated material; mixing the pretreated material with a sodium peroxide-sodium carbonate composite flux, roasting, leaching with water, and filtering to obtain a filter residue B; adding a leaching agent containing hydrochloric acid, sodium chlorate and 1, 2-cyclohexanediamine tetraacetic acid into the filter residue B according to the ratio of 1: 3-1: 5, and filtering to obtain filtrate C and filter residue C; adjusting the pH value of the filtrate C to 1.5-2.5, adding an ethanol solution of sodium N, N-diethyldithiocarbamate, precipitating, washing and calcining to obtain sponge palladium; adding ammonium chloride into the filtrate D, precipitating and calcining to obtain sponge platinum; and leaching the filter residue C by using a hydrochloric acid-chloroauric acid mixed solution containing diphenylthiourea, and replacing and calcining zinc powder to obtain crude gold. According to the process, the leaching rates of platinum, palladium and gold and the product purity are greatly improved; flux and reagent systems are optimized, consumption and energy consumption are reduced, waste liquid treatment is matched for up-to-standard discharge, and efficient resource recovery and environment-friendly cooperation are achieved.

The invention belongs to the field of precious metal recovery, and particularly relates to a method for leaching silver from a silver-containing retired crystalline silicon solar cell. According to the method, the silver in the silver-containing decommissioned crystalline silicon solar cell is recycled and leached through the synergistic effect of an HNO3-H2O2-Fe < 3 + > composite leaching agent and ionic liquid, and the ionic liquid is prepared from choline chloride and malonic acid. Meanwhile, the leaching rate of silver is further improved by optimizing experimental parameters such as the reaction temperature, the reaction time and the H2O2 supply frequency in the three-section gradient temperature control leaching reaction. Compared with the traditional technology, the method disclosed by the invention is green and environment-friendly, low in cost, small in acid consumption and high in recovery rate.

The invention provides a wet purification process suitable for silicon and precious metal of a waste photovoltaic laminated piece, which comprises the following steps of: immersing a waste crystalline silicon battery piece into a NaOH solution, and removing an aluminum wire on the surface of the crystalline silicon battery piece to obtain a dealuminized crystalline silicon piece; the dealuminated crystal silicon wafer is subjected to acid pickling, and a silver-removed crystal silicon wafer and silver leaching liquid are obtained; removing impurities from the silver-removed crystal silicon wafer through a hydrofluoric acid solution to obtain a high-purity crystal silicon wafer; and extracting the silver elementary substance from the silver leachate through a hydrazine hydrate reduction method. According to the wet purification process, the waste crystalline silicon battery piece can be subjected to high-purity recovery, and the high-purity crystalline silicon wafer and the silver elementary substance can be obtained.

The invention belongs to the technical field of chemical energy, and particularly relates to an ultralow-potential-difference zinc-air battery containing a copper cluster axial coordination iron monatomic catalyst. Benzimidazole and 2-methylimidazole are synthesized into ZIF-7-NH2, the ZIF-7-NH2 reacts with Fe (NO3) 3.9 H2O and Cu (OAc) 2. H2O in an ion exchange mode to obtain FeCu-ZIF-7-NH2, a urea calcination product g-C3N4 is added, stirring is carried out to obtain Fe-ZIF-7-NH2 / g-C3N4, finally, sintering is carried out under argon to obtain g-SAFe-Cin, the ORR activity and the OER activity of the catalyst are remarkably enhanced by constructing the copper cluster axial coordination iron monatomic catalyst, and the catalyst has the advantages of being high in catalytic activity, high in catalytic activity and high in catalytic activity. And the performance of the assembled zinc-air battery in the charge-discharge cycle is improved. Non-noble metal and a low-cost carbon source are used as raw materials, the synthesis cost of the catalyst is reduced, the yield is high, the preparation period is short, and large-scale commercial application potential is achieved.

This invention belongs to the field of high-value utilization technology of biomass resources, and discloses a method for catalyzing the depolymerization of lignin into phenolic compounds using a RuNiZn / Nb2O5 catalyst. The method includes: uniformly mixing the RuNiZn / Nb2O5 catalyst, lignin-containing biomass feedstock, and water; stirring under hydrogen atmosphere to carry out the depolymerization reaction; after the reaction, cooling to room temperature and performing solid-liquid separation; evaporating the solvent to obtain the hydrogenated depolymerization product containing monophenols. In this invention, the RuNiZn / Nb2O5 catalyst employs a technique of replacing precious metals with various non-precious metals, which improves the catalyst's reactivity and reduces the amount of precious metals used. This increases the yield of lignin depolymerization products, provides milder depolymerization reaction conditions, and ultimately significantly reduces the catalyst preparation cost and the energy cost of the lignin depolymerization process.

The invention relates to the technical field of hydrometallurgy production, and particularly discloses a method for synergistically extracting gallium and scandium by coupling titanium white waste acid with vanadium extraction converter sludge, which comprises the following steps: mixing titanium white waste acid and vanadium extraction converter sludge in proportion, stirring and leaching to obtain a leaching solution; adding an extraction agent and a diluent into the leaching solution for extraction, and washing to obtain a gallium and scandium loaded organic phase; a first stripping agent is added into the loaded organic phase of gallium and scandium for stripping treatment, and a gallium stripping solution and a loaded organic phase of scandium are obtained; sequentially carrying out alkali precipitation, alkali dissolution and electrolytic treatment on the gallium reverse extraction solution to obtain crude gallium; a second stripping agent is added into the scandium-loaded organic phase for stripping treatment, and a scandium precipitation solution and an organic phase solution are obtained; and the scandium precipitation solution is filtered, washed and subjected to acid dissolution, and a scandium-containing solution is obtained. According to the method, the titanium white waste acid is effectively recycled, rare and precious metals in the vanadium extraction converter sludge are efficiently and synergistically extracted, and the method has a relatively good popularization prospect.

The invention discloses a method for recovering precious metal from refining wastewater, and relates to the technical field of wastewater resourceful treatment. Comprising the following steps: adding a porous carbon-based composite material into the acidic silver-containing refining wastewater, and stirring for adsorption to obtain an adsorption solution; the porous carbon-based composite material adsorbing the silver ions is recycled in a filtering or centrifugal separation mode; the porous carbon-based composite material adsorbing the silver ions makes contact with a desorption agent, desorption treatment is conducted, and a regenerated porous carbon-based composite material and a silver-containing desorption solution are obtained through separation; and a reducing agent is added into the silver-containing desorption solution, and silver ions are reduced into elemental silver to be recycled. The precious metal silver in the refining wastewater is recovered by adopting an adsorption method, and the recovery rate of the silver is relatively high.

Industrial kiln flue gas noble metal purification and resource utilization equipment and method, belong to flue gas treatment technical field. In view of the problems of low purification efficiency, difficult noble metal recovery and secondary pollution of spray liquid in prior art, the equipment is composed of spray tower and resource utilization device: the exhaust disc and multilayer rotating disc are arranged in the spray tower, the flue gas is driven to rotate by arc groove to realize preliminary dispersion, and then is dispersed again through the exhaust hole of rotating disc, and the alkaline solution or chelating agent sprayed by spray pipe is matched, the purified flue gas is filtered by activated carbon layer and discharged. The resource utilization device includes a rotatable collection box, four collection pools are arranged in the collection box to alternately receive the spray liquid, a special-shaped convex disc is driven by a driving shaft to control the periodic lifting of the lifting plate, so that the cathode rod, the anode rod and the water inlet pipe are inserted into the collection pool for electrolysis recovery, and the noble metal is attached to the surface of the cathode rod. The equipment realizes the integration of flue gas dispersion, spray adsorption and electrolysis recovery, significantly improves the noble metal recovery rate and reduces the risk of secondary pollution.

The invention relates to a method for purifying rhodium from a complex-component rhodium leaching solution, and belongs to the technical field of precious metal refining and purification. The method comprises the following steps: adding a reducing agent into rhodium leaching liquid for reduction to obtain RhCl3 primary purification liquid and insoluble slag; simultaneously adding sulfite and ammonium salt into the RhCl3 primary purification liquid to precipitate rhodium in the form of (NH4) 3Rh (SO3) 3; hydrochloric acid is added into the (NH4) 3Rh (SO3) 3 precipitation residues, heating and boiling are conducted, the (NH4) 3Rh (SO3) 3 precipitation residues are dissolved in the form of RhCl3 and enter a solution, SO3 < 2-> in the solution is removed in the form of SO2, and a secondary purification solution of RhCl3 is obtained; adding a strong oxidant into the secondary purified solution of RhCl3, and carrying out oxidation reaction to obtain RhCl4; adding alkali into the RhCl4 solution to adjust the pH value, and boiling to obtain RhO2. 2H2O precipitation slag; and the RhO2. 2H2O precipitation slag is sequentially subjected to pure water slurrying, hydrazine hydrate reduction, calcination and hydrogen reduction to obtain the high-purity metal rhodium. According to the method disclosed by the invention, the high-purity metal rhodium of which the purity is greater than 99.95% can be prepared, and the direct recovery rate of rhodium is greater than 97%.