1072results about "Photography auxillary processes" patented technology

The invention discloses a preparation method of a 3-micron ultrathin lithium battery copper foil. The preparation method comprises the following steps: preparing a copper sulfate electrolyte; a wetting agent, a brightening agent and a high resistance agent are added into the copper sulfate electrolyte, the high resistance agent is at least one of thiazolidinethione, polyethyleneimine, 2-mercaptobenzimidazole and ethylene thiourea, and a mixed additive is formed; polishing and grinding a cathode roller by adopting a flying wing wheel, and carrying out electrolytic treatment on the mixed additive through the polished and ground cathode roller to obtain a first-stage copper foil; and the first-stage copper foil is placed in a nitrogen furnace to be subjected to annealing treatment, and the 3-micron ultrathin lithium battery copper foil is obtained. The invention aims to solve the technical problems that in the prior art, edge tearing, foil breaking, warping, dark appearance oxidation and the like are prone to occurring in the production process of the ultrathin copper foil, the tensile strength and the ductility are difficult to consider at the same time, and stable mass production of the 3-micron copper foil is still difficult.

The invention relates to a process for extracting iron from red mud by using hydrogen reduction and electrolysis technologies, the red mud is a by-product generated in the industrial production process of aluminum, the environmental burden caused by the by-product can be solved, the carbon emission can be reduced, and the development of a green metallurgical technology can be promoted. Comprising the following steps: conveying red mud serving as a raw material into a rotary furnace, conveying hydrogen serving as a reducing medium into the rotary furnace, enabling iron oxide in the red mud to form hydrogen reduced iron in a furnace heating state and a hydrogen reducing atmosphere, conveying the red mud containing the hydrogen reduced iron into a sulfuric acid solution, the hydrogen reduced iron is dissolved in the sulfuric acid solution to form a sulfuric acid solution containing iron ions, the sulfuric acid solution containing the iron ions serves as an electrolyte in an electrolysis device, and electrolytic pure iron formed by electrolytic deposition of the iron ions is obtained through the electrolysis device.

The present disclosure relates to the extraction of lithium from liquid resources such as natural and synthetic brines, leachate solutions from clays and minerals, and recycled products. Herein are systems and processes for extracting lithium using ion exchange materials, where transition metal impurities may be removed from the synthetic lithium solution. In some embodiments, the transition metal species are reformulated to form ion exchange materials to be used in the systems and processes described herein.

This invention belongs to the field of photovoltaic recycling, specifically relating to a method for the comprehensive recycling of waste photovoltaic modules, comprising: disassembling waste photovoltaic panels to separate photovoltaic laminates, aluminum frames, and junction boxes; crushing the photovoltaic laminates to obtain photovoltaic crushed material; subjecting the photovoltaic crushed material to a decomposition reaction to break down the EVA adhesive into non-adhesive molecules; sorting the decomposition reaction-treated photovoltaic crushed material to separate glass, plastic backsheets, and copper powder to obtain a silicon powder mixture; dissolving the silicon powder mixture to obtain a silver-containing solution and silicon powder precipitate; separating the silicon powder precipitate and converting the silver-containing solution into elemental silver for recycling. This invention performs in-depth processing based on physical sorting, further purifying the silicon powder while obtaining valuable metallic silver, increasing economic benefits, reducing recycling costs, and achieving efficient and green recycling of photovoltaic modules.

The invention discloses a method for recovering rare earth and valuable metal from waste rare earth alloy by using ionic liquid, and belongs to the technical field of non-ferrous metal metallurgy. Comprising the following steps that (1) recycled waste rare earth alloy is smashed, and waste rare earth alloy powder is obtained; (2) the waste rare earth alloy powder is put into ionic liquid to be subjected to a leaching reaction, solid-liquid separation is conducted after leaching is completed, and solid rare earth salt and filtrate are obtained; and (3) the filtrate serves as electrolyte, an electrolytic deposition system is constructed for electrodeposition, and valuable metal is obtained. The recovery method also has the advantages of simple process, environmental friendliness, high purity of the regenerated electrolyte and stable performance, and has great popularization and application prospects.

The invention provides a preparation method of ultrahigh-purity copper. The preparation method comprises the following steps: providing a first anode, a first cathode and an electrolyte; the electrolyte comprises the following components: a purified copper salt solution, inorganic acid, an oxidizing agent and an additive, the purified copper salt solution comprises purified copper salt and water, the purified copper salt comprises copper sulfate and copper nitrate, and the molar ratio of nitrate to sulfate in the purified copper salt solution is (1.5-9): 1; the additive comprises any one or a combination of at least two of an alcohol compound, polyacrylamide or a tetrazole compound; and the first cathode and the first anode are immersed in the electrolyte for electrochemical deposition, and the ultra-high-purity copper is obtained. The electrolyte composed of the purified copper salt solution, the inorganic acid, the oxidizing agent and the additive is adopted, the proportion of nitrate radicals to sulfate radicals in the purified copper salt solution is controlled, the impurity content of the sulfur element and the silver element in the electrolyte can be controlled, and preparation of the ultra-pure electrolytic copper is achieved.

The invention discloses a high-chlorine industrial wastewater treatment and chlorine recovery method, which comprises the following steps: sequentially adding copper sulfate and a carbon-sulfur reducing agent into to-be-treated high-chlorine wastewater according to a ratio, adjusting the pH value, generating chlorine-containing residues, precipitating and separating out the chlorine-containing residues from a water body, and carrying out decoloration treatment on dechlorinated tail water by adopting an electrolytic bath, copper sponge deposited at the cathode is subjected to impurity removal treatment and then is merged into a copper salt circulating system; chlorine-containing residues are subjected to dissolution and quality-divided treatment, an obtained solution phase is concentrated / crystallized, KCl is recycled, an obtained copper-containing precipitate and the sponge copper are combined and collected, the mixture is dissolved by means of dilute sulfuric acid in the oxidizing atmosphere, and the whole mixture returns to a wastewater dechlorination treatment system. CuSO4 is reduced to generate Cu < + > ions to precipitate and remove chloride ions in the wastewater, the obtained KCl product is used at a high value, and the cuprous precipitate is subjected to conversion treatment and is completely reused in the dechlorination process, so that the wastewater treatment cost is remarkably reduced, and the method has the obvious advantages of high dechlorination efficiency, no generation of solid wastes and the like, and is suitable for industrial production. And the method has wide adaptability to industrial circulating water containing 2.5-8.5 g / L of chlorine, membrane-process strong brine and the like.

The invention discloses a waste lithium ion battery comprehensive recovery method based on electrochemical driving, and belongs to the technical field of battery resource recovery. The invention relates to a comprehensive recovery method for waste lithium ion batteries based on electrochemical driving, which aims at the problems of low lithium recovery rate, high treatment cost, serious environmental pollution and the like in the traditional wet-process and pyrogenic-process recovery process, and provides a method for inducing lithium to generate electrochemical deposition on an anode / diaphragm interface through a rapid charging process to realize directional enrichment of active lithium and realize comprehensive recovery of the lithium ion batteries. And then through water immersion treatment, efficient separation and recovery of lithium, graphite and the cathode material are realized. The method is simple in process, environment-friendly, low in energy consumption and suitable for selective extraction of lithium in various types of waste lithium ion batteries, and a technical path with a good application prospect is provided for cyclic utilization of lithium resources.

The present application provides a kind of method for extracting metal gallium by vanadium extraction converter sludge, comprising the following steps: S1: vanadium extraction converter sludge is leached with leaching agent, and gallium leaching solution is obtained;S2: the gallium leaching solution of step S1 is extracted, and gallium-containing organic phase is obtained;S3: the gallium-containing organic phase of step S2 is back-extracted, and gallium-containing aqueous phase is obtained;S4: the gallium-containing aqueous phase of step S3 is treated to obtain gallium-containing precipitate, and the gallium-containing precipitate is dissolved in alkali to obtain gallium-containing alkali solution, which is treated by electrolysis to obtain metal gallium.The raw material for extracting gallium is unique, the gallium content is high, the gallium extraction process is short, the impurity removal effect is good, and the by-product produced has higher purity and better economic value.

The invention relates to a process for preparing pure iron by using red mud, which is characterized in that the red mud is Bayer process red mud, i.e., solid waste residue formed by solid-liquid separation after aluminum oxide is dissolved out from bauxite through high temperature, high pressure and strong alkali in the process of producing aluminum oxide by adopting a Bayer process, so that the environmental burden caused by the Bayer process red mud can be solved; the method is beneficial for reducing carbon emission in the aspect of iron element extraction and promoting development of a green metallurgical technology, and is characterized by comprising the following steps: taking Bayer process red mud as a raw material, carrying out acid leaching on the Bayer process red mud to obtain a ferrous oxalate extract, calcining the ferrous oxalate to obtain iron oxide, and recycling the iron oxide. And dissolving the ferric oxide into a sulfuric acid solution to obtain a ferric sulfate solution, taking the ferric sulfate solution as an electrolyte in an electrolysis device, and obtaining electrolytic iron through the electrolysis device, so that the pure iron is prepared from the red mud.

The invention discloses micro-etched copper ion electrolysis regenerated copper recovery treatment equipment, and relates to the technical field of copper ion recovery. According to the micro-etched copper ion electrolysis regenerated copper recovery treatment equipment, when the etching waste liquid is subjected to electrolytic treatment, the cathode plate installed in the reaction frame and the waste liquid are subjected to electrolytic reaction, copper ions in the waste liquid are attached to the surface of the cathode plate in the form of copper powder, rapid collection of the copper ions rich in the etching waste liquid is achieved, and the copper ions in the etching waste liquid are recycled. In the process that the negative plate moves to the upper portion of the collecting frame, the surface of the negative plate is in an attached to-be-scraped state through the scraping plate, the attached copper powder is scraped off through the scraping plate to be collected in a unified mode along with continuous upward movement of the negative plate, the whole collecting process is completely automatic, and the collecting efficiency is improved. The risk problem caused by manual contact with the waste liquid is further reduced, and meanwhile, the labor intensity of workers and the labor cost of enterprises are reduced.

The present invention relates to a method of preparing a composite material, in particular one useful as a catalyst in an electrolytic hydrogen evolution reaction and / or the oxygen evolution reaction and / or urea oxidation-assisted water electrolysis. Provided is a method of preparing a composite material, the method comprising the steps of: (i) electrochemically depositing material onto a substrate from a deposition solution comprising a nickel (II) salt and graphene oxide, to obtain a nickel-reduced graphene oxide composite material comprising nickel dispersed on reduced graphene oxide, said composite material being deposited on the substrate; (ii) after step (i), placing the substrate, having the nickel-reduced graphene oxide composite deposited thereon, in an alkaline solution along with a counter electrode; and (iii) after step (ii), partially electrochemically oxidising the nickel, to obtain a partially oxidised nickel-reduced graphene oxide composite material comprising partially oxidised nickel dispersed on reduced graphene oxide, said composite material being deposited on the substrate. The composite of the invention demonstrates high catalytic activity for electrolytic hydrogen production under alkaline water electrolysis conditions (for example, a hydrogen evolution current of up to 500 mA cm-2 at -1.35 V against a Reversible Hydrogen Electrode). High activity is demonstrated even when the substrate (on which the composite is deposited) does not contain any, or at most trace amounts, of nickel. Thus, the electrode of the invention (that is, the combination of composite material and substrate) demonstrates higher catalytic activity per unit mass of nickel compared to previous electrodes based on nickel foam. The invention also provides a composite material, an electrode, a method of electrolytic hydrogen and / or production under alkaline electrolysis conditions, and a method of electrolytic urea oxidation under urea oxidation-assisted water electrolysis conditions, thereof.

This invention provides a method for preparing (002) crystal-plane oriented metallic zinc and its application. The invention employs a two-electrode electrochemical deposition technique, using iron foil, titanium foil, or copper foil as the working electrode, commercial zinc foil as the counter electrode, and an aqueous zinc salt solution as the electrolyte. Constant current density discharge deposition is used to deposit (002) crystal-plane oriented metallic zinc on the working electrode; the constant current density is 50 mA cm⁻¹. ‑2 ~200 mA cm ‑2 The (002) crystal-plane oriented metallic zinc prepared by this invention can be used in rechargeable zinc-ion batteries. The two-electrode electrolytic cell device used in the preparation of metallic zinc in this invention is simple, the preparation process is straightforward, and the preparation method is more universal. The (002) crystal-plane oriented metallic zinc prepared according to the method of this invention can suppress zinc dendrite growth and hydrogen evolution, thereby improving the service life of rechargeable zinc-ion batteries.

The utility model discloses an acid mist recovery system with a gas-liquid separation function for an electrolytic bath. The acid mist recovery system comprises a diaphragm bag arranged on an anode plate in a sleeving mode, and a containing cavity used for containing anode liquid and acid mist is formed in the diaphragm bag; the gas-liquid separation device is provided with a separation cavity, an anolyte outlet and an acid mist outlet, the anolyte outlet and the acid mist outlet are both communicated with the separation cavity, and the anolyte outlet is lower than the acid mist outlet; the suction device is communicated with the separation device; wherein the suction device sucks the anolyte and the acid mist in the diaphragm bag into the separation cavity for separation, and the separated anolyte and acid mist flow out through the anolyte outlet and the mist outlet respectively; compared with the prior art, the scheme has the advantages that anolyte and acid mist generated in the electrodeposition process can be recycled, and the anolyte and the acid mist are separated.

The invention discloses an antimony electrolyte impurity removal adsorbent as well as a preparation method and application thereof, and relates to the technical field of antimony electrolyte purification. The adsorbent is specially used for solving the problem that lead and bismuth ions similar to antimony in potential in the antimony electrolyte are difficult to deeply remove. The preparation method comprises the following steps: mixing sulfuric acid, deionized water, antimony oxide powder and hydrogen peroxide according to a specific mass ratio (1: (0.8-1.5): (0.5-1.5)), and controlling the liquid-solid ratio to be 8-15 mL / g to form a synthetic initial solution; then reacting for 0.5-4 hours under the condition of stirring at the temperature of 60-90 DEG C and the speed of 200-600 r / min; and finally, carrying out solid-liquid separation and drying at 55-110 DEG C for 1-12 hours. When the adsorbent is applied, the adsorbent is added into electrolyte according to the proportion of 500-5000 times of the total mass of lead and bismuth, reaction is performed for 1-6 hours under the conditions of 30-90 DEG C and 200-550 r / min, and deep purification can be realized after standing, settling and separating. The method is short in technological process, mild in condition, easy to operate, environmentally friendly and high in lead and bismuth removal rate, purified liquid can return to an electrolysis system, the saturated adsorbent can be regenerated and reused, and good economic benefits and application prospects are achieved.

The invention belongs to the technical field of waste liquid treatment processes, and particularly relates to an efficient recycling process based on panel industry copper etching waste liquid. The preparation method comprises the following steps: sequentially carrying out extraction, back extraction and electrolysis to obtain elemental copper, mixing an extracted water phase obtained by extraction with a cooled backwashing agent to obtain a quasi-new solution, comparing the quasi-new solution with a formula of a standard copper etching solution through detection, and blending components to obtain the copper etching regeneration solution. According to the method, the copper etching waste liquid can be re-prepared into the copper etching regeneration liquid after copper is removed, the etching performance of the obtained copper etching regeneration liquid is consistent with that of the copper etching liquid, the treatment cost of organic matter, fluorine ions and other components in the copper etching waste liquid is reduced by recycling the copper etching waste liquid, and the recycling process and cost are greatly reduced.

Provided are methods of extracting metals from rocks and sequestering carbon dioxide. In some embodiments, provided are methods of using phytomining to extract metals from ultramafic rocks while sequestering carbon dioxide. Provided are also compositions, including metal compositions produced by the methods herein.

The utility model relates to a recyclable cathode plate cross beam for electrolytic zinc, which belongs to the field of cross beams and comprises a cross beam body, a positioning component is mounted on the cross beam body, a plug-in component is mounted on the cross beam body, and the positioning component comprises two hanging lugs clamped with the top of the cross beam body. And the bottoms of the two hanging lugs are each fixedly provided with two clamping concave blocks, the top of the cross beam body is provided with a clamping rod, and the interior of the cross beam body is fixedly provided with two conductive blocks. According to the recyclable cathode plate cross beam for electrolytic zinc, by installing the positioning assemblies, when the hanging lugs and the cross beam are welded, the hanging lugs can be preliminarily limited and installed, rapid welding of the hanging lugs and the cross beam body is facilitated, the welding efficiency and quality are improved, by installing the inserting assemblies, the hanging lugs can be conveniently fixed, and the practicability is high. The connecting strength between the hanging lugs and the cross beam is greatly improved, the cross beam is not prone to fracture along a welding seam in the using process, and the service life of the cross beam is prolonged.

The invention discloses a method for efficiently extracting and recovering valuable elements from tailings. The method comprises the steps of gradient crushing-morphology separation, rotational flow reselection-flotation coupling, enhanced alkaline leaching, biological oxidation-acid leaching collaboration, membrane electrolysis enrichment, extraction resin deep recovery and tail water zero discharge treatment. According to the method, metal is pre-enriched through gradient crushing-morphology separation; after rotational flow classification, minerals of different size fractions are recycled through gravity separation and flotation; metal with different chemical forms is dissolved through three-stage synergism of alkaline leaching, biological oxidation and acid leaching; selective deposition of valuable metal in the solution is realized through membrane electrolysis; adsorbing and recovering rare earth by using extraction resin; and tail water closed-loop treatment. According to the method, the aim of multi-element collaborative recovery is achieved, meanwhile, the recovery rate of coarse-grain gold is increased, meanwhile, high-temperature roasting is replaced with biological oxidation, energy consumption is reduced, full recycling of waste water can be achieved, and the method is quite suitable for efficient recovery of valuable elements in metal mine tailings.

The invention belongs to the field of wastewater treatment, and particularly relates to a selective separation method for zinc and cadmium in a low-concentration-difference difficult-to-separate zinc-cadmium-containing solution, which comprises the following steps: carrying out co-precipitation reaction on the low-concentration-difference difficult-to-separate zinc-cadmium-containing solution and an alkaline precipitator to obtain co-precipitation slag enriched with zinc and cadmium; the low-concentration-difference difficult-to-separate zinc-cadmium-containing solution is a solution in which the ratio of the concentration of high-concentration ions to the concentration of low-concentration ions in zinc and cadmium is 0.9-2; the concentration of cadmium is 8-40g / L; the coprecipitation slag is subjected to size mixing with water, selective cadmium dissolving is carried out under the condition that the pH of size obtained after size mixing is controlled to be 6-7.1, then solid-liquid separation is carried out, and zinc-rich slag and cadmium-rich leachate are obtained; the solid-to-liquid ratio in the slurry is 85-150g / L; carrying out deep zinc removal treatment on the cadmium-rich leachate to obtain a cadmium purification solution, and preparing the cadmium purification solution into a high-purity cadmium product with the grade of 3N or above; and the zinc-rich slag is subjected to acid leaching and deep cadmium removal treatment, a zinc purification solution is obtained, and then the zinc purification solution is prepared into a 2N-grade high-purity zinc product. According to the method disclosed by the invention, high-quality cadmium and zinc can be obtained at high yield.

The invention provides a method for preparing 6N-grade high-purity nickel through multistage electrochemical refining, and belongs to the technical field of non-ferrous metal hydrometallurgy. According to the method, under the ultra-clean environment, the ultra-pure raw materials and the pulse electrodeposition technology are used, impurity precipitation is effectively inhibited, deposition layer growth kinetics is optimized, through multi-stage linkage, parameter collaboration and whole-process quality control, the problems that according to a traditional electrolytic method, impurity removal is not thorough, and the cathode deposition morphology is poor are effectively solved, and the method is suitable for industrial production. Limit purification and compact deposition are achieved, and a 6N-grade high-purity nickel cathode product with the smooth surface like a mirror and the compact and defect-free structure can be stably and efficiently obtained. The result of the embodiment shows that the purity of the high-purity nickel obtained through the method is larger than 99.9999%, and the standard of 6N-grade high-purity nickel is met.

The invention discloses a tellurium copper slag comprehensive treatment technology and a multi-element collaborative recovery method, and relates to the technical field of non-ferrous metal metallurgy and solid waste recycling, and the tellurium copper slag comprehensive treatment technology comprises the following steps: pretreatment and arsenic volatilization removal, selective acid leaching copper extraction, tellurium enrichment through alkaline oxidation, tellurium reduction and arsenic recycling. According to the method, by combining the advantages of a wet process and a pyrogenic process, the defects that in the prior art, arsenic cannot be effectively recycled in the tellurium-copper slag treatment process and the process is complex are overcome, efficient copper and tellurium separation is achieved through coordinated regulation and control of an acid / alkali medium and an oxidizing agent, arsenic is recycled in an industrial raw material form, and the limitation that only tellurium and copper are concerned in a traditional process is broken through.

The invention belongs to the technical field of resource recycling of waste photovoltaic panels, and discloses a green metallurgical method for recycling high-purity silicon, silver and copper from waste photovoltaic panels, which comprises the following steps: (1) disassembling the photovoltaic panels to obtain laminated components, and crushing and screening to obtain light silicon powder and metal-enriched fine powder; (2) leaching the metal-enriched fine powder by using a citric acid-hydrogen peroxide mixed solution; (3) silver ingots are recycled through precipitation and electrolysis; (4) electrolyzing to obtain electrolytic copper; and (5) performing magnetic separation, alkali washing, acid washing, spark plasma sintering and direct-current electric field solidification purification on the silicon powder to obtain the high-purity silicon ingot. A leaching system composed of citric acid and hydrogen peroxide is adopted, so that the method has the advantages of no toxic gas emission, easiness in waste liquid treatment and low cost, and unification of efficient resource recovery and environmental protection is realized.

The invention discloses a 7N single crystal copper preparation process based on zone melting and crystal orientation control, which specifically comprises the following steps: S1, raw material pretreatment: purifying 4N copper to 5N grade by adopting electrolytic refining of a nitric acid system, and the carbon content after acid pickling is less than or equal to 1ppm; the invention relates to the technical field of metal material preparation. According to the 7N single crystal copper preparation process based on zone melting and crystal orientation control, impurities in a material are redistributed in a melting zone through local heating, so that separation and removal of the impurities are achieved, in single crystal copper preparation, zone melting can remarkably reduce the content of the impurities in copper, the purity of the copper is improved, and the yield of the 7N single crystal copper is improved. By accurately controlling parameters such as the temperature gradient and the cooling rate in the smelting and solidification process, optimization of crystal orientation is achieved, single crystal copper with an ideal crystal structure can be obtained, the performance of the single crystal copper is improved, and impurities can be removed and crystal defects can be reduced through zone smelting; and crystal orientation control can optimize the crystal structure and improve the performance.

This invention discloses a method for recycling and reusing cyanide silver plating wastewater. The method includes four steps: separation of silver ions and cyanide, concentration of the silver-containing solution, cyanide concentration, electrolysis and residual liquid recycling, and reuse of reclaimed water. This method achieves the separate recycling and reuse of silver, cyanide, and water. The silver-containing solution is electrolyzed to obtain metallic silver, the cyanide concentrate's main component is sodium cyanide or potassium cyanide solution, and the reclaimed water with a conductivity below 20 μS / cm is reused in the production line. This method not only maximizes resource utilization and reduces wastewater discharge, but also separates most of the cyanide from the silver-containing solution during electrolysis, making the electrolysis process safer. Furthermore, the residual liquid after electrolysis can be recycled multiple times for the separation and concentration of silver ions and cyanide.

The invention discloses a lithium battery copper foil online aging device and method, and belongs to the technical field of copper foil production, the device comprises an anode tank, a passivation tank, a drying and aging mechanism and a copper foil winding mechanism which are arranged in sequence, and a roll shaft system for realizing copper foil conveying; the drying and aging mechanism comprises an electromagnetic induction heating coil and an infrared temperature sensor, the electromagnetic induction heating coil is located under the copper foil, and the electromagnetic induction heating coil is connected with an alternating current source; the infrared temperature sensor is used for collecting surface temperature data of the copper foil in real time, and the infrared temperature sensor is in communication connection with a power supply host of the electromagnetic induction heating coil; and a cooling mechanism for cooling the surface of the copper foil is arranged on the output side of the drying and aging mechanism. The aging time is greatly shortened, and the production efficiency can be remarkably improved; and through accurate temperature and stress feedback control, uniform heating of the copper foil is ensured, internal stress is effectively eliminated, and the warping degree of the copper foil is reduced.

The utility model discloses a crushed electrolytic zinc recovery device, which relates to the technical field of metallurgy, and comprises a layering box, a heating box, a condenser and an electromagnetic drying box, the inside of the layering box is fixedly connected with a layering plate, and the top of the layering box is fixedly connected with a siphon, a slag suction pipe and a slag inlet pipe respectively; a temperature control panel is fixedly connected to the surface of the heating box, an air inlet pipe is fixedly connected to the top of the heating box, a powder outlet pipe is fixedly connected to one end of the condenser, a fixing plate is fixedly connected to one side of the layering box, a slag suction machine is fixedly connected to the surface of the fixing plate, and an aluminum removal box is fixedly connected to the bottom of the electromagnetic drying box. Zinc liquid is recycled through the siphon principle, then zinc in the zinc liquid is evaporated through heating, then the zinc liquid is condensed into zinc powder through the condenser, finally the zinc powder is recycled through the zinc powder recycling box, zinc and aluminum slag is absorbed, dried and subjected to aluminum removal through the slag absorbing machine, and finally the zinc and aluminum slag is recycled through the recycling pipe.

The application provides a Pd-Se catalyst and its preparation and application in hydrogen production and magnesium extraction and hydrogen peroxide production by electrolysis of seawater. The preparation method of the catalyst mainly comprises the following steps: preparing Pd-Se nanocrystals from a precursor solution by using a segmented temperature rising and a hot injection reaction. The catalyst is mainly used for hydrogen production, magnesium extraction and hydrogen peroxide production by electrolysis of seawater. The application has the advantages that the formation of crystal nucleus and the subsequent growth process can be accurately and controllably regulated, the prepared catalyst has significantly improved structural stability, the dispersion degree of active sites is greatly improved, and the overall catalytic performance is significantly enhanced. In the specific application process, the resource comprehensive utilization efficiency is greatly improved, the seawater resources are converted to multi-level and high value-added directions, and the green and sustainable development concept of 'one water for multiple uses' is fully embodied.

The invention provides a method for recycling battery pieces from waste photovoltaic panels, and belongs to the technical field of solid waste resource utilization. According to the method, residual EVA decomposition and aluminum back electrode recycling are achieved through selective alkali liquor treatment, then silicon wafers are obtained through acid leaching recycling, the silver electrode is further recycled through electrolytic treatment, the treatment process is simplified, and the recycling cost is reduced; in addition, the recovery rate of aluminum and silver is high.

The present application relates to the technical field of manganese industry wastewater treatment device, and particularly discloses a comprehensive treatment method for electrolytic manganese production wastewater containing medium and high concentration ammonia nitrogen, which comprises the steps of removing manganese, solid-liquid separation of manganese removal wastewater, adding a precipitant for precipitation reaction, etc.; according to the characteristics of electrolytic manganese production wastewater containing manganese, ammonia nitrogen, calcium, magnesium, sulfate ions, etc., by fully utilizing the magnesium ions in water, more than 95% of the manganese ions and all the phosphate radicals in water can be selectively removed by using slurry of quicklime, without introducing excessive calcium ions, effectively reducing the dosage of magnesium salt and phosphoric acid reagent, reducing the treatment cost, so that the electrolytic manganese production wastewater containing medium and high concentration ammonia nitrogen with ammonia nitrogen > 50 mg / L can be completely treated to reach the standard by using the ammonium magnesium phosphate precipitation method, and the indexes of manganese, ammonia nitrogen, phosphate radical and pH value after treatment can all reach the first standard limit value requirement of the Comprehensive Sewage Discharge Standard (GB 8978-1996), and the manganese, ammonia nitrogen and magnesium resources in the wastewater can be recovered.