1758 results about "Zinc" patented technology

The invention provides an acetylacetone-based composite thermal stabilizer which is a mixture obtained by mixing zinc acetylacetonate, calcium acetylacetonate or magnesium acetylacetonate and hydrotalcite pro rata. The composite thermal stabilizer is suitable for chloride-containing high polymer, such as polyvinyl chloride, chlorinated polyethylene, chlorinated polyvinyl chloride, copolymer of vinyl chloride-ethylene or copolymer of vinyl chloride-vinyl acetate, has better thermal stability, prolongs the thermal aging time of the chloride-containing high polymer, and overcomes the shortcomings of poor long-term performance of single stabilizer of zinc acetylacetonate, poor transparency of stabilizer of calcium acetylacetonate, and poor initial colorability of stabilizer of hydrotalcite. The composite thermal stabilizer has low cost, good initial colorability, excellent long-term performance and good transparency, and is an efficient composite thermal stabilizer.

The invention discloses a matte glaze and a preparation method thereof. The matte glaze comprises the following components by weight: 1-5 parts of zinc oxide, 5-15 parts of barium carbonate, 0-15 parts of zirconium silicate, 10-25 parts of potassium feldspar, 10-20 parts of kaolin, 5-15 parts of calcite, 5-15 parts of calcined talcum powder, 20-35 parts of a matte frit and 0.5-1 part of an additive. Specifically, the matte frit comprises the following components by weight: 30-50 parts of SiO2, 15-20 parts of Al2O3, 0.01-0.5 part of Fe2O3, 3-10 parts of CaO, 0.5-5 parts of MgO, 1-5 parts of K2O, 3-10 parts of Na2O, 3-10 parts of ZnO, 0.1-1 part of B2O3 and 10-25 parts of BaO. By introducing the matte frit, the melting temperature of the formula is lowered, the firing range of the formula isbroadened, and the glaze texture achieves a fine matte effect.

The invention discloses piggy creep feed containing composite flavone. The piggy creep feed is prepared from the following raw materials in parts by weight: 13 to 20 parts of expanded corn, 10 to 25 parts of corn, 6 to 13 parts of broken rice, 8 to 12 parts of flour, 8 to 15 parts of whey mist, 3 to 8 parts of soy protein concentrate, 5 to 10 parts of extruded soybean, 0.7 to 3 parts of soya-bean oil, 7 to 12 parts of 46.5-percent bean pulp, 2 to 5 parts of fish meal, 2 to 5 parts of plasma protein powder, 0.3 to 0.7 part of mountain flour, 0.5 to 1.0 part of calcium hydrophosphate, 0.05 to 0.5 part of lysine, 0.05 to 0.3 part of threonine, 0.1 to 0.3 part of sodium chloride, 0.1 to 0.8 part of compound flavone premix compounds, 0.15 to 0.3 part of zinc oxide, 0.03 to 0.06 part of calcium propionate, 0.02 to 0.04 part of ethoxyquin and 1.0 part of suckling pig premix compounds. The invention also discloses a preparation method. The intestinal tract health and the production performance of weaned pigs can be improved.

The invention relates to the technical field of in-situ / ex-situ remediation of sites polluted by heavy metals such as cadmium, lead, copper and zinc, and discloses a heavy metal polluted soil remediation system and method based on intelligent management and control. The system comprises an electrode system module, an activator module, a targeted adsorption device module, an automatic monitoring system module, an intelligent decision-making system module and a photovoltaic power supply module. The method comprises the steps of driving heavy metal ions in soil to directionally migrate through an electric field; the activating agent module works, green micromolecule organic acid and other activating agents are injected in a gradient mode, and the migration efficiency of heavy metal is improved; activated heavy metal ions can be captured by an adsorption material in the targeted adsorption device module in cooperation with a selective enrichment device; meanwhile, the automatic monitoring system module collects environmental parameters in real time; the intelligent decision-making system module optimizes the remediation efficiency and energy consumption according to the real-time data, and low-cost and high-efficiency remediation of soil heavy metal pollution is achieved. The remediation efficiency is remarkably improved, and the risk of secondary pollution is reduced.

The invention provides a multi-source geophysical prospecting data fused Zenzenite rock mass contact zone anomaly method and system, and relates to the technical field of geophysical prospecting, the method comprises the following steps: executing joint denoising processing and time-frequency feature enhancement processing on a TFEM data set in a three-dimensional fused data volume, and outputting the optimized three-dimensional fused data volume; and based on the optimized three-dimensional fusion data body, by establishing a mapping relationship between magnetic, electric and polarization anomalies and a geologic body, quantifying the correlation between a multi-parameter combination and a mineralization index and screening an up-to-standard abnormal region, and finally delineating a magnetic anomaly gradient zone, a low-resistance region and a high-polarization anomaly co-occurrence ore prospecting target region three-dimensional distribution diagram. Through multi-source geophysical prospecting method collaboration, data deep fusion, quality optimization and accurate mapping, full-chain technology upgrading from data acquisition to target area delineation is realized, and the high efficiency of mineral exploration is improved.

The invention relates to the technical field of magnesium alloys, in particular to a high-toughness rare earth-containing magnesium alloy and a preparation method thereof.The high-toughness rare earth-containing magnesium alloy is prepared from, by weight, 3-8 parts of Zn, 1-5 parts of RE, 0.5-3 parts of Al, 0.1-1 part of Mn, 0.05-0.3 part of Zr and the balance Mg; rE is a combination of Y, Nd and La in a mass ratio of (2-3): 1: (0.5-1). Zinc is used as a secondary main element to replace part of aluminum, efficient solid solution strengthening is achieved through high solid solubility of zinc in magnesium, meanwhile, the morphology and distribution of a precipitated phase are regulated through rare earth, a beta-MgZn2 phase is formed, the high-temperature stability is better, balance optimization of strength, toughness and corrosion resistance is achieved, meanwhile, the welding performance of the alloy is improved through combination of Y, Nd, La and Zr, and the welding performance of the alloy is improved. The hot crack tendency is reduced, the brittle phase problem of a traditional high aluminum alloy is avoided, and the corrosion resistance and the machining performance are synergistically improved.

The invention provides a production process for stably controlling adhesive force of a DP steel zinc layer. The production process comprises the following steps: step 1, setting a heating section 1, a heating section 2 and a furnace nose section in a total radiation heating annealing furnace; 2, according to the model and thickness of DP steel, target dew points of a first heating section, a second heating section and a furnace nose section are set; 3, according to the target dew points set in the first heating section, the second heating section and the furnace nose section in the step 2, water vapor is put into the protective gas for humidification, and the water vapor reacts with Si, Mn and Cr elements enriched on the surface of the steel plate to generate volatile oxides; the dew point of the annealing furnace is precisely controlled in a segmented mode, different humidification modes are adopted, and the surface state is controlled, so that surface oxide residues are reduced, cleanliness of a steel substrate is guaranteed, and the binding force of a zinc layer is improved; the iron oxide layer formed on the surface of the steel plate enters a reducing atmosphere annealing furnace containing hydrogen, the hydrogen can reduce the iron oxide layer on the surface of the steel plate to form a reduced iron layer, and the adhesive force of a zinc layer is improved.

The invention relates to composition and preparation of a thick-film copper conductor sintered at different temperatures and different atmospheres, and belongs to the field of chemical preparation. Comprising the following steps: mixing 65-85% of copper powder, 3.0%-15.0% of glass, 15.0%-35.0% of an organic adhesive and 0.1-1.5% of an additive which is one or more of titanium trioxide or stannous oxide, cuprous oxide and copper oxide, rolling into slurry, and sintering at 850-950 DEG C under the protection of nitrogen or ammonia gas to obtain a copper conductor. The medium-temperature copper paste is prepared by the following steps: mixing 60.0-85.0% of copper powder, 3.0-13.0% of glass, 8.0-25.0% of an organic adhesive and 0.2-1.6% of an additive which is one or more of titanium sesquioxide or stannous oxide, cuprous oxide and copper oxide, rolling into paste, and sintering at 450-650 DEG C under the protection of nitrogen or ammonia gas to obtain a copper conductor. The low-temperature copper paste is prepared by mixing 60.0-85.0% of copper powder, 3.0-13.0% of glass, 8.0-25.0% of an organic binder and 0.1-2.0% of an additive which can be one or more of elemental elements of magnesium, zinc, boron and phosphorus or one or more of nickel phosphide, nickel boride, copper phosphide and copper oxide, rolling the mixture into paste, and sintering the paste in air at 250-350 DEG C to obtain a copper conductor.

The invention relates to the technical field of metallurgy, in particular to a zinc-aluminum-magnesium coating preparation method capable of keeping coating integrity in a corrosion environment, alloy steel with the thickness of 1.8 mm or above is adopted, in the preparation process, a continuous annealing process adopts a three-section heating process, and an after-plating cooling process adopts a three-section variable-temperature cooling process; a plating solution adopted by the zinc-aluminum-magnesium plating layer comprises the following chemical components in percentage by weight: 9-11% of Al, 2.8-3.1% of Mg, less than or equal to 0.1% of rare earth elements, 0.1-0.2% of Si and the balance of Zn and inevitable impurities; according to the invention, the key problems of poor coating structure uniformity, contradiction between scratch resistance and self-repairing capability, limitation of super-thick coating preparation process, insufficient adaptability to extreme corrosion environment and the like of the existing zinc-aluminum-magnesium coating technology in industrial application are solved, and the coating can efficiently keep structural integrity in the industrial corrosion environment, and can be widely applied to the industrial corrosion environment. And meanwhile, the requirements of super-thick coating preparation, complex working condition adaptability and low-cost industrial production are met.

The invention provides a method and a device for recovering valuable metals from copper smelting slag, and the method for recovering valuable metals from copper smelting slag comprises the following steps: before molten copper smelting slag is transferred into a slag ladle for cooling, adding first gas, gypsum slag and nitrogen into the molten copper smelting slag in a plasma injection mode, and after injection is completed, adding second gas into the slag ladle for cooling; and metal gaseous substances and copper slag are obtained. Carrying out post-treatment and flotation on the copper slag to obtain a valuable metal sulfonium phase and depleted slag; wherein the first gas is one or more of CO, H2, CO2 and CH4; and the metal gaseous substances comprise gaseous lead and gaseous zinc. And the valuable metal sulfonium phase is sulfides of copper, iron, lead and zinc. The process method and device are simple, the production time is shortened, CO2 emission can be reduced, secondary pollution caused by waste water and waste residues is avoided, and the green metallurgy requirement is met.

The invention relates to a high-corrosion-resistance and heat-resistance hot-dip galvanized alloy hot stamping steel component and a preparation method, and belongs to the technical field of component production. The hot stamping steel component comprises a steel base body and a plating layer attached to at least part of the surface of the steel base body. Wherein the steel matrix comprises the following chemical components in percentage by mass: 0.15%-0.35% of C, 0.1%-0.4% of Si, 2%-5% of Mn, less than or equal to 0.05% of P, less than or equal to 0.05% of S, 0.05%-0.2% of Al, 0.05%-0.2% of V, 0.05%-0.1% of Ti, less than or equal to 0.05% of N, 0.001%-0.004% of B and the balance of Fe and inevitable impurities; the plating layer comprises the following chemical components in percentage by mass: 5%-50% of Al, 0.5%-2% of Fe, 0.1%-5% of Si and the balance of Zn and inevitable impurities. Elements Al, Si and Fe are added into a zinc-based coating to form a metal inhibition layer, the inhibition layer cannot disappear in the hot stamping heating process, cracks can be inhibited from extending into a substrate in the stamping process, and therefore the problem of liquid metal embrittlement (LME) is effectively solved.

The invention provides a method for recycling valuable substances and cyanide in cyanide-containing wastewater, and belongs to the technical field of cyanide-containing wastewater treatment. The method comprises the following steps: firstly, carrying out replacement reaction on a physicochemical material (reducing substance zinc) and a copper-cyanogen complex in the cyanogen-containing wastewater to displace copper, and filtering to obtain filter residues containing zinc and copper, so as to realize copper recovery; in the replacement reaction, the copper-cyanogen complex in the filtrate is converted into a zinc-cyanogen complex with a lower stability constant, and then the zinc in the filtrate is recycled by diaphragm electrolysis. The method specifically comprises the following steps: dividing an electrolytic cell into a cathode region and an anode region by utilizing a membrane material, and enabling electrode reactions to be independently carried out, so that cyanide is prevented from entering the anode region to generate electrochemical oxidation and the decomposition of the cyanide is inhibited, and the cyanide is recycled in a solution for cyclic utilization; and then an alkali-resistant titanium-based coating electrode is used as an anode plate, a porous material is used as a cathode plate, recovery of zinc on the cathode plate is promoted, and recovery of valuable metal zinc and copper and cyclic utilization of cyanide are achieved.

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 discloses a high-toughness corrosion-resistant semi-solid injection molding magnesium alloy and a preparation method thereof, and belongs to the technical field of metal materials. The magnesium alloy comprises the following chemical components in percentage by weight: 8.6 to 11 percent of aluminum, 0.5 to 1 percent of zinc, 0.05 to 0.4 percent of manganese, 0.05 to 0.2 percent of calcium, 0.6 to 2 percent of rare earth element RE and the balance of magnesium and inevitable impurities. The preparation method of the alloy comprises the following steps: (1) adding raw materials according to the component proportion, smelting into magnesium alloy melt, pouring into a mold, and molding to obtain a magnesium alloy ingot; (2) cutting the cast ingot into magnesium alloy semi-solid blank particles; (3) performing injection molding to obtain a molded part; (4) solid solution heat treatment; and (5) performing two-stage aging heat treatment. The magnesium alloy has high toughness and corrosion resistance, and is suitable for semi-solid injection molding. The forming process can achieve near-net forming of complex components, and castings are few in defect, compact in structure and wide in application prospect.

The invention relates to the technical field of novel environment-friendly materials, in particular to a ZnO / ZnFe2O4 desulfurization adsorbent with a stable porous structure and a preparation method of the ZnO / ZnFe2O4 desulfurization adsorbent with the stable porous structure, and the preparation method of the ZnO / ZnFe2O4 desulfurization adsorbent with the stable porous structure comprises the following steps: step 1, preparing a zinc-iron salt mixed solution; preparing an alkaline mixed solution; step 2, dropwise adding the alkaline mixed solution prepared in the step 1 into the zinc-iron salt mixed solution while stirring, and adjusting the pH value to 9-10; then carrying out a water bath reaction to obtain a zinc iron-double metal hydroxide; 3, the zinc iron-bimetal hydroxide prepared in the step 2 is subjected to high-temperature calcination, and the ZnO / ZnFe2O4 desulfurization adsorbent with the stable porous structure is obtained.The zinc iron-bimetal hydroxide (ZnFe-LDH) serves as a raw material, under the high-temperature calcination condition, the ZnFe-LDH is decomposed to generate ZnO and Fe2O3, then the ZnO and the Fe2O3 are further subjected to a solid-phase reaction to generate ZnFe2O4 (excessive ZnO), and the ZnO / ZnFe2O4 desulfurization adsorbent with the stable porous structure is obtained. And finally, the ZnO / ZnFe2O4 desulfurization composite adsorption material is prepared.

The invention relates to the technical field of ceramic glaze preparation, in particular to a formula of ceramic glaze, which comprises the following components in percentage by mass: 25-30% of modified zircon sand; 20 to 25% of spodumene; 15 to 20 percent of nano aluminum oxide; 10 to 15% of petalite; 8-12% of kaolin; 3-5% of a silver-loaded zeolite antibacterial agent; 5-8% of boron carbide-silicon nitride composite powder; 2-3% of zinc borate; and 10-15% of a composite frit. A three-dimensional grid structure (the Vickers hardness is greater than or equal to 1800 HV) is formed through boron carbide-silicon nitride composite powder, and the wear resistance is improved by 40% in combination with a potassium feldspar modification technology; the silver-loaded zeolite realizes slow release of Ag, the antibacterial rate is greater than 99.9%, a gradient sintering process enables a glaze layer to form a gradient density structure, the porosity of a surface layer is less than 0.5%, the porosity of a bottom layer is 3-5%, the oxidation defect of the copper red glaze is avoided through CO / N atmosphere control, and the color development uniformity delta E is less than or equal to 0.8; the firing temperature is reduced by 150 DEG C, and the energy consumption is reduced.

According to the lead-zinc ore sorting method and the electronic equipment, in the preprocessing stage, an obtained raw ore high-energy diagram is registered with a low-energy diagram as the benchmark, physical response difference measurement is adopted, the low-energy diagram and the registered high-energy diagram are fused to obtain a fusion diagram, the fusion diagram is colored according to a color transition rule, a pseudo-color diagram is obtained, and a lead-zinc ore sorting result is obtained. And the pseudo-color image is used as input, and a target detection model based on deep learning is used for processing, so that accurate and efficient recognition of the lead-zinc ore in the raw ore is realized.

The invention belongs to the field of preparation processes of zinc-rich coatings, and relates to a preparation process of a corrosion-resistant water-based passivated zinc-rich coating, which comprises the following steps: obtaining spherical zinc powder; carrying out ball milling treatment; performing kneading treatment; and high polymer coating. The process provided by the invention can meet the requirements of the market on high-performance, environment-friendly and low-cost anticorrosive paint.

The invention discloses a preparation process of special-shaped zinc powder, which comprises the following steps: cleaning spherical powder, pressing into a thin pancake, coating a ferromagnetic material part on the surface of the spherical zinc powder through magnetron sputtering, and then carrying out oriented shearing ball milling by using a high-energy ball mill and an external magnetic field, so as to obtain the special-shaped zinc powder. And the processed special-shaped zinc powder is graded through magnetic separation and a special-shaped screen to prepare the non-magnetic or weakly-magnetic 1-5 [mu] m screened special-shaped zinc powder. By means of the technology, the special-shaped zinc powder which is appropriate in sphericity degree and high in one-time ball milling qualification rate can be efficiently prepared and used for production of zinc-rich paint.

The invention provides an anodic oxidation passivation method of a neodymium-iron-boron permanent magnet zinc coating, which comprises the following steps of: performing electrochemical anodic oxidation by taking a neodymium-iron-boron permanent magnet with a zinc coating on the surface as an anode, a Pt sheet as a cathode and a passivation solution as an electrolyte, forming a passivation layer on the surface of the neodymium-iron-boron permanent magnet with the zinc coating on the surface, and cleaning and drying to obtain the neodymium-iron-boron permanent magnet with the zinc coating on the surface. A chromium-free passivation film is formed on the neodymium-iron-boron permanent magnet zinc coating, and passivation of the neodymium-iron-boron permanent magnet zinc coating is completed; the passivation solution is prepared from 10 g / L to 20 g / L of molybdate, 10 g / L to 15 g / L of ammonium fluozirconate, 1 g / L to 10 g / L of etidronic acid, 1 g / L to 10 g / L of sodium dihydrogen phosphate, 1 g / L to 10 g / L of nitric acid, 1 g / L to 10 g / L of phosphoric acid and the balance distilled water. According to the method disclosed by the invention, a complete, uniform and compact passivation film is formed on the surface of the zinc coating after passivation, the corrosion potential is improved while the corrosion current is effectively reduced, and the time for generating a rust spot in a salt spray test exceeds 72 hours.

The invention discloses a rapid enrichment-atomic absorption spectrum analysis method for low-content gold in gold ore, and relates to the technical field of gold ore analysis and detection.The rapid enrichment-atomic absorption spectrum analysis method comprises the following steps that an ore sample and a solid composite additive are mixed and roasted at the low temperature of 500-650 DEG C, and the additive contains alkali metal carbonate and zinc oxide; sulfur fixation, catalytic oxidation of organic carbon and stabilization of volatile elements can be synchronously realized; the method comprises the following steps: roasting gold-loaded activated carbon, dissolving the gold-loaded activated carbon in aqua regia to obtain a to-be-enriched solution, enabling the solution to pass through an adsorption column filled with modified activated carbon, pretreating the activated carbon with a 1-10% ammonium citrate solution to improve the selective adsorption capacity of the activated carbon on gold chloride complex ions, ashing the gold-loaded activated carbon, dissolving residues, fixing the volume, and measuring by using an atomic absorption spectrometry. According to the rapid enrichment-atomic absorption spectrum analysis method for the low-content gold in the gold ore, through cooperation of low-temperature roasting of the composite additive and selective adsorption of the modified activated carbon, the decomposition efficiency and enrichment selectivity of the ore difficult to treat are improved.

The invention belongs to the technical field of environment-friendly treatment, and provides a treatment process for natural gas combustion waste gas generated by zinc chloride production based on zinc ash and zinc slag and acid mist waste gas generated by regenerated acid decoction, which comprises the following steps: S1, introducing the natural gas combustion waste gas and the acid mist waste gas into a spray tower, carrying out dynamic alkali neutralization treatment and cooling treatment on the basis of an intelligent pH value regulation and control method to obtain primary purified gas; s2, the primary purified gas enters primary plasma dedusting and demisting equipment through a pipeline to be treated, and secondary purified gas is obtained; and S3, the secondary purified gas enters secondary plasma dedusting and demisting equipment to be treated, and final treated tail gas is obtained. According to the invention, the chemical neutralization based on the spray tower and the two-stage plasma deep cracking are combined, the treated waste gas meets the emission limit value in the secondary standard in the Integrated Emission Standard of Air Pollutants, the treatment efficiency is high, the medicament consumption is low, the energy consumption is low, and the problems in the prior art are effectively solved.

The invention relates to the technical field of material surface corrosion prevention, in particular to a spraying method for a heavy anti-corrosion coating of a port steel structure. The method comprises the following steps that (1) sand blasting derusting treatment is conducted on a steel structure base body, so that the cleanliness of the steel structure base body reaches the Sa2.5 level, and the roughness is controlled to range from 40 micrometers to 75 micrometers; 2) coating the treated substrate with epoxy zinc-rich primer, and doping graphene modified zinc powder accounting for 1-3% of the total mass of the primer to form a primer layer with a dry film thickness of 60-80 [mu] m; (3) after the primer layer is cured, the primer layer is coated with epoxy micaceous iron oxide intermediate paint, aluminum tripolyphosphate accounting for 2-5% of the total mass of the intermediate paint is further added into the epoxy micaceous iron oxide intermediate paint, and an intermediate paint layer with the dry film thickness being 150-200 microns is formed; 4, the middle paint layer is coated with weather-resistant finish paint, and a finish paint layer with the dry film thickness being 60-80 microns is obtained.According to the method, the adhesive force, chloride ion permeation resistance, salt fog resistance (larger than or equal to 3000 hours) and weather resistance of the coating are remarkably improved, the method is suitable for the harsh marine environment, and the service life of the steel structure can be prolonged to 20 years or above.

The invention discloses a recyclable porous copper / cuprous oxide filamentous catalytic material and also discloses a preparation method of the catalytic material, and the preparation method comprises the following steps: taking a copper wire and pre-treating the copper wire to remove surface oxides; performing zinc electrodeposition treatment on the copper wire to obtain a galvanized copper wire; carrying out solution treatment on the galvanized copper wire to obtain a porous copper precursor; then, the porous copper precursor is subjected to corrosion treatment, zinc in a plating layer is removed, and a porous copper catalyst carrier is obtained; and putting the porous copper catalyst carrier into a tubular furnace for high-temperature oxidation to obtain the Cu / Cu2O filamentous catalytic material. The catalytic material provided by the invention has the characteristics of recoverability and good catalytic performance. According to the method, cuprous oxide is generated by adopting a one-step high-temperature thermal oxidation method, and regulation and control parameters are few and easy to control in the process.

The invention discloses a method for enriching and recovering germanium from an indium raffinate obtained by zinc hydrometallurgy by using fine zinc powder, which comprises the following steps: first-stage enrichment: adding germanium precipitation slag into the indium raffinate for reaction, then adding fine zinc powder to enrich germanium, and filtering to obtain an enriched solution and germanium concentrate after the enrichment is completed; wherein the germanium content in the indium raffinate is 50 mg / L-300 mg / L, and the adding amount of the fine zinc powder is 0.92-0.98 times of the theoretical amount of the required fine zinc powder for completely neutralizing sulfuric acid in the indium raffinate; fine zinc powder is added into the enriched liquid for germanium precipitation, the final pH is controlled to be 5.0-5.3, and germanium precipitation liquid and germanium precipitation residues are obtained through filtering; wherein the germanium precipitation slag is returned to the indium raffinate, and the germanium precipitation liquid enters a zinc returning system. According to the method, the fine zinc powder is used as a raw material for enriching and recovering germanium in the indium raffinate, so that the recovery and precipitation rate of germanium in the indium raffinate exceeds 98%, the content of germanium in germanium concentrate reaches 15%, the content of germanium in germanium precipitation liquid is smaller than or equal to 5 mg / L, and the phenomenon of zinc electrolysis plate burning caused by the fact that the germanium precipitation liquid enters a zinc return system is avoided.

The invention relates to a finite element method for calculating temperature distribution of a steel strip in a continuous hot galvanizing process, and belongs to the technical field of hot galvanizing methods. According to the technical scheme, the method comprises the steps that relevant sizes and technological parameters of a continuous hot galvanizing production line are obtained; model establishment and grid division are conducted, a three-dimensional model is established according to the related size, the model comprises molten zinc and a steel belt, and the molten zinc and the steel belt are set to be solid models; and setting boundary conditions, performing heat exchange calculation, and processing a calculation result. The method has the beneficial effects that the method is used for analyzing the temperature distribution of the steel strip in the hot galvanizing process and analyzing the flow field and the temperature field of molten zinc; and the change of working condition parameters such as the temperature of the steel brought into the zinc pot, the moving speed of the steel strip, the thickness and width of the steel strip, the temperature and depth of molten zinc and the like is accurately responded, so that the optimization of the continuous hot galvanizing process is guided.

The present invention discloses a method for recovering zinc, lead, and silver from zinc-oxygen press slag using a combination of microbial leaching and chloride leaching. This method simultaneously recovers zinc, lead, and silver from zinc-oxygen press slag through a process of crushing, slurry adjustment, acid balancing, bioleaching, solid-liquid separation, slurry adjustment, chloride leaching, and solid-liquid separation. The leaching rates for zinc, lead, and silver are ≥95%, ≥95%, and ≥90%, respectively. This method offers the advantages of simple process, environmental friendliness, ease of operation, and high recovery of valuable metals.

The invention discloses a method for preparing a NaFeO2 material and leaching copper, zinc and molybdenum from copper slag, and relates to the technical field of metallurgical solid waste resource utilization. The method comprises the following steps: grinding the copper slag, mixing the ground copper slag with a sodium salt, roasting the mixture in a muffle furnace at a proper temperature, and finally carrying out ultrasonic washing and filtering on the roasted product to obtain filter residues and filtrate; and drying filter residues to obtain a high-purity NaFeO2 material, and recovering valuable metals such as copper, zinc and molybdenum from filtrate. In the washing process, valuable metal elements copper, zinc and molybdenum in the copper slag are efficiently leached into the solution, the leaching rate reaches 96% or above, and synchronous recovery of the valuable elements is achieved; according to the method, the industrial waste residue copper slag is successfully converted into the NaFeO2 product with the high additional value, meanwhile, valuable metal is efficiently extracted, the method has the advantages of being simple in process, low in cost, high in recycling degree and environmentally friendly, a new way is opened up for high-value utilization of the copper slag, and the method has good industrial application prospects.

The invention discloses a powder metallurgy brake shoe for a locomotive and a preparation method, and relates to the technical field of metallurgy brake shoes, the powder metallurgy brake shoe comprises the following raw materials by mass percentage: 50%-70% of a matrix component, 10%-18% of a reinforcing component, 10%-16% of a lubricating component and 10%-16% of a friction component; the matrix component comprises electrolytic copper powder; the reinforcing components comprise reduced iron powder, superfine iron powder, atomized nickel powder, molybdenum powder and zinc powder; the lubricating component comprises artificial graphite and sulfide. According to the invention, the performance reduction of the brake shoe and the decline of a matrix at high temperature are effectively inhibited, the stability of a friction coefficient is kept, the abrasion is reduced, and the service life is prolonged.

The invention discloses an NF-loaded high-valence metal doped-high-entropy layered double hydroxide / MOF composite material, and belongs to the technical field of high-entropy catalysts. A two-step hydrothermal method is adopted, firstly, a metal organic framework material (MOF) precursor Ni-MOF is prepared through the hydrothermal method, then a metal salt solution containing iron, zinc, cerium, cobalt and the like is prepared at the room temperature, the solution is fully stirred and subjected to ultrasonic uniformization and transferred into a high-pressure kettle, the precursor Ni-MOF is added, and the metal salt solution containing iron, zinc, cerium, cobalt and the like is obtained. And carrying out hydrothermal treatment, washing and drying to obtain the high-valence metal doped high-entropy layered double hydroxide / MOF composite material loaded on foamed nickel (NF). According to the technical scheme, due to the synergistic effect of the MOF and the high-entropy LDH, the MOF / LDHs have excellent electrochemical performance, and the introduction of the high-valence metal can regulate an electronic structure and expose rich active sites, so that the electrocatalytic activity of the MOF / LDHs is improved, and excellent HER, OER and UOR activities are obtained.