58 results about "Iron copper" patented technology

The invention aims to provide a method for preparing micron-sized zinc metastannate by wet recovery of tin and zinc in electronic wastes and a synthetic method of 4-hydroxy-1-indanone, and belongs to the technical field of metal recycling. According to the method, amino coordination and carboxylic acid chelation are utilized, tin and zinc in the electronic waste are selectively leached out under the mild acidic condition, impurity metals such as iron and copper are retained in residues due to the difference of complexing constants, and metal ion grade separation (selectivity gt and 99%) is achieved. And then, through evaporation-crystallization regulation and control, the Sn-Zn complex is directionally reconstructed into micron-sized zinc metastannate. In indanone synthesis, micron-sized zinc metastannate forms a local protonic acid environment by adsorbing trace moisture in a reaction system, synchronously activates a C = N bond (Lewis acid site catalysis) of an imine substrate and stabilizes a cyclization transition state (hydrogen bond guiding effect), so that the activation energy of [4 + 1] cycloaddition reaction is reduced, reaction equilibrium is driven to move towards a product end, and the yield of indanone is increased. And quantitative conversion of indanone under mild conditions (the yield is 60%) is realized.

The invention discloses an iron-copper diatomic catalyst with sustainable dual oxidation-reduction cycles as well as a preparation method and application of the iron-copper diatomic catalyst. A carrier of the iron-copper diatom catalyst is graphite phase carbon nitride, iron-copper diatoms are combined on the carrier through an N4-Fe-Cu-N3 coordination structure, and the coordination effect of the iron-copper diatoms enables the iron-copper diatom catalyst to efficiently activate hydrogen peroxide through continuous iron-copper dual redox cycle; the mass fractions of iron and copper diatoms in the catalyst are respectively 1%-10% and 3%-15%, so that the diatom catalyst capable of realizing the sustainable dual redox cycle can effectively activate hydrogen peroxide in the process of degrading organic pollutants, and meanwhile, the pollutants are efficiently degraded.

The application relates to the field of wastewater treatment catalysis, and discloses a Fe-Cu-Mn ternary hydrotalcite-like catalyst and a preparation method thereof, which comprises iron, copper and manganese; the iron, copper and manganese are distributed in the layer plate metal central site in an atomic dispersion mode; the layer plate oxygen octahedron is in a non-symmetrical stretching distortion state; a 3.2-4.8 degree deviation is generated in the manganese oxygen copper bond angle in the layer plate; the lattice parameter a of the layer plate 110 crystal face direction is 0.305-0.312 nm; the molar ratio of copper to manganese is 1:2-1:5; and the molar sum of copper and manganese to the molar ratio of iron is 2:1-4:1. According to the application, the lattice non-symmetrical distortion induces the space overlap of the auxiliary metal and the iron active center orbit, an electron transfer path is constructed, the shielding effect of the hydroxyl ion on the iron active site under the alkaline environment is eliminated, the catalytic site activity is maintained, and stable and efficient catalytic treatment under wide pH working conditions is realized.

The invention discloses a preparation method and application of a hexavalent chromium treating agent based on nanoscale zero-valent iron, and relates to the technical field of hexavalent chromium treating agents. The key points of the technical scheme are as follows: nanoscale zero-valent iron (mFe0) prepared by using a macro preparation technology is firstly subjected to weak acid etching modification treatment; the preparation method comprises the following steps: preparing a kaolin-loaded nano zero-valent iron-copper (Ko-cFe0 / cCu0) material from nano zero-valent iron (cFe0), carrying out modification treatment on the nano zero-valent iron-copper (cFe0) loaded by a chemical reduction method to prepare a nano zero-valent iron-copper (mFe0 / cCu0) material, and finally carrying out modification treatment on nano zero-valent iron (cFe0) loaded kaolin (Kaco-cFe0 / cCu0) prepared by a chemical reduction method, which is almost equivalent and has a better loading effect, to prepare the kaolin-loaded nano zero-valent iron-copper (Kaco-cFe0 / cCu0) material, and preparing the kaolin-loaded nano zero-valent iron-copper (Kaco-cFe0 / cCu0) material. A material for removing Cr (VI) in water is successfully developed, and the problems that nano zero-valent iron is low in degradation efficiency, poor in stability, serious in agglomeration phenomenon and the like are gradually solved.

The application discloses a preparation method of a modified vanadium-iron denitration catalyst and relates to the technical field of catalysis. The application does not need to introduce tungsten-containing and molybdenum-containing raw materials in the whole process. A vanadium source alkaline solution and a citric acid chelated iron-copper chelated solution are prepared, a double-stage mixing in-situ composite process is adopted, the iron-copper chelated solution is added into a premixed material of a carrier and a vanadium source in a buried material type dropping mode, a linkage control system pH is stabilized, a V-Fe-Cu-O ternary solid solution is formed, then phosphorus elements are embedded and a molding aid is added to mix and form a plastic mud material, after aging, extrusion molding and gradient drying, the material is calcined in an oxidative atmosphere in stages, and a stable V-Fe-Cu-P composite solid solution is formed. Through time sequence decoupling and precise process control, the application realizes uniform dispersion of active component molecules at a molecular level, improves the denitration activity, mechanical strength and sulfur deactivation resistance of the catalyst, and the process is simple and suitable for industrial scale production.

The invention discloses a treating agent for in-situ remediation of aquaculture wastewater and a preparation method of the treating agent, and belongs to the field of aquaculture wastewater treatment. The treating agent is prepared from, by mass, 20-40 parts of hydroxylated montmorillonite, 10-20 parts of diatomite loaded iron-copper composite particles, 30-50 parts of chitosan-sodium alginate composite microspheres, 5-15 parts of modified zeolite powder, 1-3 parts of EDTA disodium and 2-5 parts of polyglutamic acid, the mass ratio of iron to copper in the diatomite loaded iron-copper composite particles is 5: 1, and the loading capacity is 15-20 wt.%. The preparation method comprises the following steps: mixing an adsorption matrix, adding catalytic and auxiliary components, and carrying out composite molding, wherein the addition amount is 0.5-2g / L. The treatment agent efficiently removes COD (Chemical Oxygen Demand), ammonia nitrogen, total phosphorus and heavy metals by virtue of an adsorption-catalysis-slow release synergistic effect, the 30-day removal rate reaches 90% or above, the action period is long, secondary pollution is avoided, the treatment agent is safe to aquatic organisms, growth is promoted, many problems in the prior art are solved, and the treatment agent is suitable for an in-situ remediation scene.

The invention relates to a low-nickel high-iron-copper alloy glass mold material and a preparation method thereof, and relates to the field of alloy materials and preparation thereof, and the low-nickel high-iron-copper alloy glass mold material comprises the following components in percentage by weight: 4.00 to 6.50 percent of Ni, 8.5 to 11.00 percent of Al, 0.00 to 1.00 percent of Zn, 3.00 to 5.00 percent of Fe, 0.00 to 0.20 percent of Sn, 0.00 to 0.50 percent of Si, 0.00 to 0.10 percent of Pb, and the balance of Cu and inevitable impurities. The preparation method comprises the following steps that smelting is conducted at the temperature of 1250-1300 DEG C according to the composition proportion, and alloy liquid is obtained; the alloy liquid is poured into a mold at the temperature of 1200-1250 DEG C, a casting mold is subjected to heat preservation and cooling for 2-3 h and taken out, and a blank is obtained; and cutting and shaping the blank, carrying out heat treatment, and cooling to obtain the low-nickel high-iron copper alloy glass mold material. By regulating and controlling the composition and the preparation process, the nickel content in the glass mold material is reduced, and meanwhile, the good wear resistance, hardness, thermal stability and heat-conducting property of the material are kept.

The invention discloses an activated carbon loaded metal oxide and a preparation method and application thereof, and relates to the technical field of environmental adsorption purification, the activated carbon loaded metal oxide comprises an activated carbon loaded iron oxide, an activated carbon loaded copper oxide and an activated carbon loaded iron-copper bimetallic oxide; the active carbon loaded metal oxide prepared by the invention effectively enhances the specific surface area of the active carbon and the activity of surface functional groups, obviously improves the adsorption capacity of the novel triazine ultraviolet absorbent, overcomes the problems of limited adsorption capacity and slower adsorption rate of the traditional active carbon, can activate a high-grade oxidant, and improves the adsorption efficiency of the novel triazine ultraviolet absorbent. The novel triazine ultraviolet absorbent is efficiently and synergistically removed and degraded through the synergistic effect of adsorption and degradation, meanwhile, the whole preparation process is simple and convenient, the cost is low, the materials can be repeatedly used, and good application and popularization value and economic feasibility are achieved.

The invention provides an arsenic adsorbent as well as a preparation method and application thereof, the arsenic adsorbent takes nano gamma-Al2O3 as a carrier, and an iron-copper sulfide active phase with an Fe-Cu-S electron-rich interface is loaded on the surface of the carrier. The preparation method of the arsenic adsorbent comprises the following steps: dispersing an iron source, a copper source and nano gamma-Al2O3 in a solvent, and then sequentially carrying out ultrasonic treatment and drying treatment to obtain a precursor; and mixing the precursor with a sulfur source, and calcining to obtain the arsenic adsorbent. The adsorbent has high adsorption capacity and wide temperature range adaptability to trivalent arsenic and pentavalent arsenic in flue gas, has stable and even promoted performance in an SO2-containing atmosphere, and can convert gaseous arsenic into a stable crystal phase for fixation.

The invention discloses a method for eliminating interference of high-content manganese ions during testing of the zinc content of zinc concentrate through an EDTA titration method, and belongs to the technical field of zinc concentrate detection. The technical problem to be solved by the method is to eliminate the interference of high-content manganese ions on the test of the zinc content of the zinc concentrate by the EDTA titration method. Through a strategy of step-by-step reduction (hydroxylamine hydrochloride)-oxidation precipitation (hydrogen peroxide), interfering trivalent manganese is converted into manganese dioxide which is easy to filter, so that efficient separation of manganese and zinc is realized. The heating concentration step promotes sulfide decomposition and reduces acid consumption; precision pH control (3.0-4.0) ensures complete reduction of manganese and avoids hydrolysis of zinc. The filtrate is treated by a masking agent to thoroughly eliminate iron / copper interference, and finally, the titration end point is monitored in real time by combining a photometric electrode, so that the zinc recovery rate is increased.

The invention discloses a device and a method for inhibiting electric arc additive manufacturing structure segregation of an iron-copper binary refractory gold wire, and belongs to the field of electric arc additive manufacturing of wires. According to the method, powder adding, porous stirring and low-temperature rapid cooling synergism are adopted, and segregation is inhibited from the combined action of three aspects of thermodynamics, dynamics and the solidification process. The method comprises the steps that Fe wires and Cu wires serve as independent electrodes to be fed into a molten pool, alloying is achieved in an electric arc molten pool by accurately controlling the wire feeding speed, and meanwhile nickel-titanium carbide composite powder is fed into the molten pool under the condition that the molten pool is stirred through a porous stirring head; when a welding system starts to move, a gas-solid mixed CO2 forced cooling device is started immediately, gas-solid mixed CO2 is directly sprayed to the surface of a deposition layer close to the rear portion of a molten pool, rapid cooling is achieved, layer-by-layer accumulation is conducted, and FeCu alloy electric arc additive manufacturing is achieved. The alloy deposition layer is uniform in structure and fine in grain, and the mechanical property can be greatly improved.

This invention relates to the field of wastewater treatment technology, specifically to a process and system for removing heavy metals from ink wastewater. It includes the following steps: coagulating ink wastewater with a metal composite coagulant, adsorbing and removing sludge wastewater with an ink sludge-based adsorbent, and filtering wastewater using a catechol-modified polyethersulfone membrane, followed by detection. This invention utilizes high-iron copper slag with titanium tetrachloride and acetylacetone to prepare a metal composite coagulant, transforming the copper slag into a high-value-added water treatment agent. This significantly reduces the production cost of the coagulant. Through the synergistic leaching of dilute sulfuric acid and hydrogen peroxide, the iron element in the copper slag is efficiently extracted and oxidized into Fe, which has a strong coagulation effect. 3+ The trace amounts of copper and other metal ions dissolved also provide a basis for subsequent composite reactions, thus improving the overall treatment efficiency and effluent quality of oily sludge wastewater.

The invention discloses a preparation method and application of an iron-copper diatomic nano-enzyme, and relates to a preparation method and application of a nano-enzyme. The invention aims to solve the problem that the clinical application of the traditional treatment means is often limited and challenged by severe systemic toxicity, drug resistance and tumor recurrence although the traditional treatment means improve the survival rate of patients. The method comprises the following steps: 1, dissolving dimethylimidazole in absolute methanol, and stirring to obtain a solution A; step 2, dissolving zinc nitrate hexahydrate, ferric ammonium citrate and copper acetylacetonate in absolute methanol, and stirring to obtain a solution B; 3, mixing and stirring the solution A and the solution B, centrifuging, washing and drying to obtain a white sample ZIF-8; and step 4, pyrolyzing the white sample ZIF-8 at 900 DEG C to obtain black powder, namely the iron-copper diatomic nano-enzyme. The invention belongs to the technical field of active oxygen mediated tumor treatment.

A catalyst for removing nitrous oxide and a method of removing nitrous oxide are provided. The catalyst includes a metal oxide powder and an iron-copper compound. The iron-copper compound is attached to the surface of the metal oxide powder, where the metal oxide powder includes zinc oxide, magnesium oxide, aluminum oxide, or a combination thereof. A molar ratio of iron in the iron-copper compound to the metal in the metal oxide powder is 1:1.3-4.0.

The invention relates to an iron-copper double-monatomic electrocatalyst as well as a preparation method and application thereof, and belongs to the field of nano functional materials. The iron-copper double-monatomic electrocatalyst is composed of active metal components and a carrier, the active metal components are loaded on the carrier in a monatomic dispersion state, the active metal components are Fe and Cu, and the carrier is an oxygen-sulfur co-doped carbon nanotube. The preparation method comprises the following steps: preparing a sulfur-rich polymer nanotube through a super-crosslinking reaction, carrying out pyrolysis and oxygen plasma treatment to obtain a carbon nanotube co-doped with rich oxygen and sulfur atoms, and carrying out impregnation-calcination to obtain the iron-copper double-single-atom anchored carbon nanotube electrocatalyst. And an electrocatalytic reduction nitrate catalyst with excellent catalytic activity, high ammonia selectivity and stable monatomic active sites is prepared.

The invention discloses carbon-based bimetal composite chitosan gel and application thereof to removal of dye in printing and dyeing wastewater, and belongs to the technical field of environmental functional materials and water treatment. The preparation method comprises the following steps: firstly, carrying out amino modification on wood charcoal through polydopamine modification and microwave hydrothermal treatment to obtain a PDA-coated BC material; and then mixing with chitosan sol, then carrying out coordination crosslinking with an iron-copper bimetal salt solution, and finally carrying out gelation, washing and freeze drying to obtain the composite gel. The prepared composite gel has the biocompatibility of chitosan, the high specific surface area of a carbon material and the synergistic enhancement effect of bimetal, and has the advantages that the composite gel can be used for treating dyes in printing and dyeing wastewater, especially anionic dyes; the adsorbent shows high adsorption capacity (for example, the Congo red adsorption capacity can reach 1678 mg / g or above) and excellent cyclic regeneration performance (the capacity retention rate gt after five times of circulation is 90%) which are far superior to those of a traditional adsorbent, and has a wide application prospect in the field of advanced treatment of industrial wastewater.

A process for leaching copper and lead from a metallurgical residue of smelted powder which has undergone a copper leaching process and comprises copper, iron, lead, silicon and optionally arsenic, antimony and bismuth, comprising: (i) leaching copper from the metallurgical residue with a first acid solution so as to obtain a first leach solution rich in copper and iron and optionally arsenic, antimony and bismuth and a first leached sludge having a reduced copper and iron content and optionally a reduced arsenic content and being rich in lead and silicon, (ii) leaching the first leached sludge with a first solution of carboxylate salt so as to obtain a second leached sludge lacking lead and a second leach solution rich in lead, (iii) precipitation, wherein a first base is added to the second leach solution rich in lead so as to obtain a first lead concentrate and a first precipitated solution lacking lead, (iv) alkaline leaching of the second leached sludge, wherein a second base is added so as to form an alkaline leaching solution so as to obtain a third leached sludge having a reduced silicon content and a third leach solution rich in silicon and optionally arsenic, (v) hydrochloric acid leaching of the third leached sludge, wherein an acid solution is used in a chloride environment so as to obtain a fourth leached sludge for final disposal and a fourth leach solution rich in copper, lead and iron and optionally arsenic, (vi) (vii) precipitating metals from the fourth leach solution rich in copper, lead and iron and optionally arsenic with a neutralizing slurry so as to produce a fifth solution rich in chlorides and a first precipitated solid rich in iron, copper and lead and optionally arsenic, and (viii) leaching the first precipitated solid rich in iron, copper and lead and optionally arsenic with a sulphuric acid solution so as to produce a sixth leach solution rich in copper, iron and optionally arsenic and a second lead concentrate.

The invention discloses a gold concentrate sulfur content high-frequency infrared absorption determination method adopting an iron-copper composite fluxing agent, and belongs to the technical field of ore chemical analysis. The method comprises the following steps: drawing a standard working curve by using ZBK series certified standard substances similar to a gold concentrate matrix, weighing 0.04-0.06 g of a gold concentrate sample, firstly adding 0.2-0.4 g of a pure iron fluxing agent to cover the sample, then adding 0.7-0.9 g of a pure copper fluxing agent, releasing SO2 through high-frequency combustion, and detecting the sulfur content through infrared absorption. The problems of splashing, insufficient combustion, matrix interference and high cost of a traditional tungsten-based fluxing agent are solved, the vulcanization risk caused when pure copper is independently used is avoided, the absolute error value of a measurement result and an external detection result is smaller than or equal to 0.33%, the accuracy rate reaches 100%, and the method is suitable for gold concentrate with the sulfur content of 0.437%-47.40% and has accuracy, stability and economical efficiency.

The application discloses a kind of iron copper molybdenum alloy powder, at least including the following weight percentage components: iron 75%-90%, copper 8%-20%, molybdenum 1%-5%;The iron copper molybdenum alloy powder is obtained by co-precipitation of soluble salt aqueous solution of iron, copper and molybdenum with alkali, drying to generate oxide precursor, and then reducing;Wherein, the reduction operation is first reduced at 650-680 DEG C for 3.5-4.5 h, and then reduced at 700-750 DEG C for 1.5-2.5 h.The iron copper molybdenum alloy powder prepared by optimizing component ratio and preparation process has excellent hardness, and is suitable for the production of various sintered diamond tools.The sintered body prepared has excellent bending strength, wide market prospect and significant application value.

The application discloses encapsulated copper oxide iron framework doped MFI molecular sieves, and a preparation method and application thereof. The iron source and copper complex are simultaneously added into a crystallization liquid, and are crystallized in a high-temperature hydrothermal crystallization kettle to obtain the encapsulated copper oxide iron framework doped MFI molecular sieves. In the encapsulated copper oxide iron framework doped MFI molecular sieves, the iron is doped into an MFI framework to form framework coordinated iron, and the copper is encapsulated in double ten-membered ring channels in the form of copper oxide. The encapsulated copper oxide iron framework doped MFI molecular sieves are used as catalysts to catalytically degrade tetracycline. At a reaction temperature of 50 DEG C, the tetracycline degradation rate is more than 99.0% after 20 minutes of reaction, and the catalytic reaction performance does not obviously decrease after five cycles of reaction, and the cycle stability is excellent.

A method for preparing nano-zero-valent mineral-based ternary functional materials by roasting natural iron-containing nano-minerals and its application relate to the technical field of microplastic degradation and treatment. Crushed and sieved natural pyrite is mixed with copper ore, laterite nickel-iron ore, and phosphite powders, or natural laterite nickel-iron ore and copper ore powders are mixed separately and stirred with water until uniform mixing is achieved. The mixture is then dried and roasted and pyrolyzed in hydrogen to produce nano-zero-valent iron-copper-sulfur, iron-nickel-sulfur, iron-phosphorus-sulfur, and iron-nickel-copper mineral-based ternary functional materials, respectively. These materials have a highly open pore structure, a large specific surface area, and a high number of hydroxyl functional groups on their surfaces, resulting in high reactivity. The nano-zero-valent mineral-based ternary functional materials are then combined with persulfate to form a heterogeneous, advanced oxidation system, catalyzing the persulfate to produce highly oxidative free radicals, enabling efficient and rapid degradation of microplastics. These materials are widely applicable as functional materials in various fields, such as water treatment and ecological restoration.

The application discloses a method for realizing iron circulation and copper reinforced recovery in a one-step copper smelting process of low-iron copper concentrate, which comprises the following steps: directly pouring smelting slag produced by mixing low-iron copper concentrate with iron ore powder and smelting by a one-step copper smelting method into a reduction smelting furnace, adding appropriate amount of reducing agent blocks and slagging agents, forming copper-iron alloy after reduction and purification, and naturally separating and settling the copper-iron alloy in the furnace, returning the obtained copper-containing molten iron at the lower layer to a flash smelting furnace for reuse, and directly selling the upper layer molten slag after water quenching as tailing slag. The application returns the copper-containing molten iron at the lower layer to the furnace, solves the problem that the copper-iron alloy is difficult to apply, replaces part of iron-containing raw materials for slagging, realizes iron circulation, returns the molten liquid directly, avoids heat loss as much as possible, indirectly saves energy consumption, and makes the melts more easily contact, which is beneficial to smelting and slagging reactions.

The invention belongs to the technical field of mineral beneficiation and processing, and particularly relates to a beneficiation method for recovering valuable metal from complex sulfur concentrate and application of the beneficiation method. The beneficiation method provided by the invention comprises the following steps: roasting; ore grinding operation; performing strong magnetic separation operation; carrying out flotation operation; the cyclone performs grading operation; shaking table operation; centrifugally operating; combining concentrates; and the like. The method comprises the following steps: firstly, roasting sulfides in the sulfur concentrate, completely converting the sulfides into oxides, and modifying valuable minerals; and by utilizing the property difference of the modified minerals, three products, namely iron ore concentrate, copper concentrate and tin concentrate, are obtained by adopting a magnetic-flotation-gravity combined process, so that high-valued reutilization of the sulfur concentrate is also realized while tin resource recovery is realized, and resources such as iron and copper are also recycled. And finally, concentrate products with the tin grade larger than 30%, the iron grade larger than 55% and the copper grade larger than 20% can be obtained.

The invention provides H2O2 self-supplied iron-copper bimetallic nano-enzyme and a preparation method and application thereof.The preparation method includes the steps that mesoporous silica serves as a carrier, copper nitrate trihydrate serves as a copper source, iron acetylacetonate serves as an iron source, reaction is conducted for 6 h under the hydrothermal condition, iron-copper double-doped mesoporous silica is synthesized, then the mesoporous silica is calcined for 3 h at the temperature of 500 DEG C in a muffle furnace, and the iron-copper bimetallic nano-enzyme is obtained. Under the alkaline condition provided by sodium hydroxide, a product obtained after calcination is subjected to H2O2 in-situ oxidation, and the iron-copper bimetallic nano-enzyme (O < 22->-Fe / Cu-O-Si) rich in peroxide bonds is prepared. The nano-enzyme has relatively strong H2O2 self-supply capability, and can be used for pointedly relieving the problems that the content of endogenous H2O2 in tumor cells is insufficient, and active oxygen is difficult to effectively generate. In a weakly acidic tumor microenvironment, the nano-enzyme can generate H2O2 and release low-valence iron and copper ions, the H2O2 is efficiently catalyzed to generate hydroxyl free radicals (OH) with high cytotoxicity through an iron-copper bimetal synergistic mediated Fenton-like reaction, the intracellular active oxygen level is greatly improved, and tumor cell apoptosis is effectively induced. SiO2 is used as a carrier, so that the stability and the biocompatibility of the material are improved, and the acid response controllable release of the active component at a tumor part is also realized. Through the synergistic effect of self-supply H2O2 and explosive OH generation, the dependence of traditional nano enzyme on exogenous H2O2 is overcome, and a new strategy is provided for tumor catalytic treatment.

The application provides a method for high-selectivity separation of iron and copper and application thereof; the method for high-selectivity separation of iron and copper comprises the following steps: S1, providing a complexing agent-alkali mixed solution; the complexing agent-alkali mixed solution contains a metal ion complexing agent and an alkaline substance; S2, mixing and treating an iron-copper mixed solution and the complexing agent-alkali mixed solution to obtain a reaction solution; the iron-copper mixed solution contains ferric ion, ferrous ion and copper ion; the molar ratio of the metal ion complexing agent to the copper ion is 1.5-3:1; the molar ratio of the alkaline substance to iron in the iron-copper mixed solution is 4-8:1; the mixing and treating is carried out at a temperature of 10-45 DEG C; S3, performing solid-liquid separation on the reaction solution to obtain a copper-containing separation solution and a ferric solid substance. The application effectively realizes high-selectivity separation of iron and copper in the iron-copper mixed solution.

The purpose of the present invention is to provide a method for wet recovery of tin and zinc in electronic waste to prepare micron-sized zinc metastannate and a method for synthesizing 4-hydroxy-1-indanone, which belongs to the field of metal recycling technology. The method utilizes amino coordination and carboxylic acid chelation to selectively leach tin and zinc from electronic waste under mild acidic conditions, while impurity metals such as iron and copper are retained in the residue due to differences in complex constants, achieving metal ion-level separation (selectivity>99%). Subsequently, by evaporation-crystallization regulation, the Sn-Zn complex is directionally reconstructed into micron-sized zinc metastannate. In the synthesis of indanone, micron-sized zinc metastannate forms a local proton acid environment by adsorbing trace water in the reaction system, synchronously activating the C=N bond of the imine substrate (Lewis acid site catalysis) and stabilizing the cyclization transition state (hydrogen bond directing effect), reducing the activation energy of the [4+1] cycloaddition reaction, driving the reaction equilibrium to move toward the product end, and achieving quantitative conversion of indanone under mild conditions (yield 60%).

The present invention relates to the field of water treatment technology, and in particular to a composite material, a preparation method thereof, and an application thereof. The preparation method of the composite material comprises: loading nano-zero-valent iron copper on granular activated carbon, wherein the mesh size of the granular activated carbon is 2 to 10 meshes. The present invention controls the size of the activated carbon particles and uses the granular activated carbon to load bimetallic nanoparticles, which not only solves the problem of easy agglomeration of nano-zero-valent iron (nZVI) and improves its dispersibility in water, but also realizes the modification of GAC, reduces the polar functional groups in GAC, enhances the hydrophobicity of GAC, and further improves the adsorption capacity of activated carbon for nitrosamines in water.

The present invention relates to the field of comprehensive recycling and utilization of metal resources, and specifically discloses a comprehensive treatment method for copper-arsenic-rich solid waste. The method comprises: adding the copper-arsenic-rich solid waste and a leaching agent to a reactor for leaching to obtain a leachate at a leaching temperature of 110-150°C for a leaching time of 1-3 hours, using black acid as the leaching agent; filtering the leachate using a first filter press to obtain a filtrate; adding the filtrate to a heat exchanger to preheat the leaching agent; adding an iron extractant to an extraction and iron removal unit to extract and remove iron from the filtrate; adding a copper extractant to an extraction and copper removal unit to remove copper from the iron-extracted residual solution; adding the copper-extracted residual solution to a reduction and arsenic precipitation unit, and then performing a filter press to obtain As2O3. This method extracts iron and copper separately, and standard cathode copper can be obtained by subsequent copper stripping. It can achieve the coordinated treatment of black acid, arsenic-copper slag, and high-arsenic smoke, achieving efficient separation and recycling of copper and arsenic, with a short process and high efficiency.