18 results about "Lead nitrate" patented technology

The invention provides a method for enriching rare earth ore in low-grade apatite. The method comprises the steps of ore pretreatment, graded desliming, three-time graded flotation and four-time rare earth rough concentrate concentration. According to the method, efficient mineral dissociation is achieved by optimizing the pretreatment process, an environment-friendly zinc phosphate complex is adopted to replace lead nitrate to serve as a modification activating agent, the flotation selectivity and the recovery rate of the rare earth minerals are improved by combining the synergistic effect of a specific regulator and a collecting agent, and finally the rare earth minerals with the raw ore grade being 0.15%-0.50% are enriched to the grade being 11.65%-12.55%; and the recovery rate reaches 85% or above, meanwhile, the production cost is reduced, the lead pollution risk is eliminated, and green and efficient utilization of low-grade apatite associated rare earth resources is achieved.

This invention belongs to the field of mineral processing technology, specifically disclosing a method for recovering scheelite and fluorite from scheelite rough concentrate by ambient temperature flotation. It replaces the traditional reagents used in laboratory-scale tests with a reagent combination of sodium carbonate, brine glass, and a lead nitrate-hydroxyvalerate complex. Combined with grinding, concentration, and de-removal pretreatment, this method achieves efficient recovery of scheelite and fluorite from scheelite rough concentrate under ambient temperature conditions. The recovered scheelite concentrate has a WO3 grade of over 32.95%, with an operational recovery rate of over 61.55%; the fluorite concentrate has a CaF2 grade of over 93.22%, with an operational recovery rate of over 51.25%. This method achieves comprehensive recovery and utilization of associated resources, eliminating the need for heating or acid leaching treatment and significantly reducing energy consumption.

The present application relates to a kind of for CO2 reduction CsPbBr3 quantum dot / BiOCl heterojunction photocatalyst and its preparation method, the preparation method has the following steps: with bismuth oxychloride and lead nitrate is added to aqueous solution, freeze-drying after ultrasonic, by muffle furnace calcination, obtain precursor material;CsPbBr3 quantum dot / BiOCl heterojunction photocatalyst is obtained by two-step calcination method again by adding cesium bromide and potassium bromide, dissolving, ultrasonic, freeze-drying, by muffle furnace calcination its feature is.CsPbBr3 quantum dot / BiOCl heterojunction photocatalyst prepared has excellent performance and good cycle stability.The drug used in preparation is easily obtained and low in price, and preparation is simple and short in time.CsPbBr3 quantum dot / BiOCl heterojunction photocatalyst prepared can be successfully applied in the field of photocatalytic CO2 reduction.

The application discloses a combined depressor for recovering scheelite from ultra-low-grade tungsten-molybdenum associated ore and a method, the combined depressor comprising sodium humate, sodium mercaptoacetate, ammonium citrate, sodium pyrophosphate, sodium fluosilicate and lead nitrate, and the six kinds of substances are configured into the combined depressor in a proportion of 1:1:(2-5):(1-5):(1-3):(2-5). The application aims at recovering scheelite from low-grade refractory ore, improves the separation effect of scheelite and gangue minerals, improves the scheelite recovery rate and the concentrate grade, and improves the economic benefit.

What is provided is stannous oxide having an α-ray emission amount of 0.002 cph / cm2 or less after heating in an atmosphere at 100° C. for 6 hours. Tin containing lead as an impurity is dissolved in a sulfuric acid aqueous solution to prepare a tin sulfate aqueous solution, and lead sulfate is precipitated in the aqueous solution and removed. While stirring the tin sulfate aqueous solution from which lead sulfate has been removed, a lead nitrate aqueous solution containing lead having an α-ray emission amount of 10 cph / cm2 or less is added to cause lead sulfate to be precipitated in the tin sulfate aqueous solution, and simultaneously the tin sulfate aqueous solution is circulated while removing the lead sulfate from the aqueous solution. A neutralizing agent is added to the tin sulfate aqueous solution to collect stannous oxide.

This invention discloses a method for preparing and applying a lead-doped copper-based electrocatalyst. The method includes the following steps: mixing an aqueous solution containing trisodium citrate dihydrate with an aqueous solution containing copper sulfate, then adding an aqueous solution of sodium hydroxide to obtain an orange precursor; dissolving the dried orange precursor in a methanol solution of lead nitrate to anchor Pb nanoparticles onto a copper substrate (PbCu2O); and finally pyrolyzing the PbCu2O in a tube furnace to obtain the lead-doped copper-based electrocatalyst. The electrocatalyst for the reduction of carbon monoxide to multi-carbon products obtained by this invention exhibits a Faradaic efficiency of 96.5%, with a Faradaic efficiency of 66.5% for ethanol, and a cycling stability of 100 h.

The application belongs to the technical field of photocatalytic materials, and provides a method for preparing a defective PbBiO2Br multilayer hollow nanosphere catalyst. The method comprises the following steps: (1) adding bismuth nitrate and lead nitrate into a nitric acid solution, and standing the solution to obtain a solution A; (2) obtaining a mixed solution B by adding brominated 1-octyl-3-methyl imidazole, water and a TX-100 emulsifier; (3) adding the mixed solution A into the mixed solution B to obtain a mixed solution C; (4) adjusting the pH of the mixed solution C to 10-10.5, and performing hydrothermal treatment, centrifugation and drying, and the obtained product is the defective PbBiO2Br multilayer hollow nanosphere catalyst after refinement. The method has the advantages of simple process, simple operation and low cost. The PbBiO2Br catalyst synthesized by the method has stable performance, high catalytic efficiency and strong selectivity, and is mainly applied to selective oxidation of organic matters.

The application relates to the technical field of lead-carbon batteries, and aims to provide a preparation method of a composite material of reduced graphene oxide loaded amorphous lead. The method comprises the following steps: adding ammonia water into a lead nitrate solution containing polyvinylpyrrolidone and uniformly mixing, then adding a sodium hypochlorite solution to perform an oxidation reaction; performing a hydrothermal reaction on the obtained solution, washing and drying a white product obtained in the reaction to obtain lead nitrate hydroxide powder; sequentially adding sodium dodecyl sulfate, lead nitrate hydroxide and ascorbic acid into a graphene oxide dispersion liquid and uniformly mixing, and performing a reduction reaction under oil bath conditions; after centrifugal washing and product collection, the product is dispersed in deionized water, and a black powder composite material product is obtained through condensation and freeze drying. The composite material can inhibit the oxygen evolution phenomenon on the surface of reduced graphene oxide, accelerate the electrochemical oxidation reaction, promote the formation of positive active material as a positive electrode additive, and greatly improve the cycle life through the pore-forming agent.

The invention discloses a high-stability alkaline chemical nickel-phosphorus-copper plating ternary alloy plating solution and a plating method, and belongs to the technical field of metal surface treatment. According to the method, sodium citrate, sodium pyrophosphate and sodium lactate are compounded to serve as complexing agents, urea and thiourea or lead nitrate are combined to serve as stabilizing agents, the preferential replacement reaction of Cu < 2 + > is effectively inhibited, and uniform codeposition of the Ni-P-Cu ternary alloy is achieved. The plating solution is high in stability under the conditions that the pH is 9.0-10.0 and the temperature is 63-68 DEG C, can be used for preparing a thick plating layer with the copper content being 5% or above and the thickness being larger than or equal to 50 microns, is suitable for various base materials such as magnesium alloy, carbon steel and stainless steel, and has the advantages of being low in energy consumption, wide in application range, excellent in plating layer performance and the like.

The invention relates to the technical field of flotation, in particular to a flotation reagent and method for recycling copper components in copper slag. The invention provides a flotation reagent for recycling copper components in copper slag. The flotation reagent comprises a composite activating agent and a composite collecting agent. The composite activating agent is prepared from 2, 5-dimercaptothiadiazole and a modifier I; the first modifier is selected from at least one of copper sulfate, copper chloride, copper nitrate, lead nitrate and lead chloride; the composite collecting agent is composed of xanthate and a second modifier. The modifier II is selected from at least one of black powder, thionocarbamate compounds, fatty acid compounds and hydroximic acid. According to the invention, the composite activator highly matched with the copper oxide component in the copper slag is constructed, so that the active sites on the surface of the copper oxide are fully exposed and directionally strengthened; and meanwhile, a composite collecting agent with ultrahigh selectivity on the copper component is introduced, so that copper oxide and copper sulfide are efficiently and synchronously collected in the same process, and deep enrichment and comprehensive recovery of the copper component in the copper slag are achieved.

The application discloses a beneficiation method for recovering tungsten from polymetallic tungsten tailings, and is characterized by comprising the following steps: obtaining strong magnetic concentrate and strong magnetic tailings through strong magnetic separation; concentrating the strong magnetic concentrate to a slurry with a concentration of 30%, adding sodium carbonate to the slurry to make the pH value of the slurry reach 7.0-9.0, then adding sodium hexametaphosphate, OS, salted water glass, lead nitrate and a tungsten capturing agent, and then feeding the mixture into a flotation machine to obtain wolframite concentrate and wolframite tailings; adjusting the strong magnetic tailings to a slurry with a concentration of 30%, adding oxalic acid, water glass and a capturing agent LLR to the slurry, and then feeding the mixture into a flotation machine to obtain scheelite-fluorite concentrate and co-floating tailings; and concentrating the scheelite-fluorite concentrate to a slurry with a concentration of 30%, and then performing 'one roughing and three cleaning' centrifugal gravity separation to obtain scheelite concentrate and fluorite concentrate. Under the acid condition, the flotation effect of the fluorite is enhanced, the interference on the scheelite flotation is reduced as much as possible, and the recovery rate and grade of the wolframite concentrate and the scheelite concentrate are improved.

The invention discloses an anti-cracking and anti-seepage composite material for concrete. The anti-cracking and anti-seepage composite material comprises the following components in parts by weight: 80-82 parts of light calcium carbonate; 3-6 parts of magnesium carbonate; 1.5 to 3 parts of titanium dioxide; 0.5 to 1.5 parts of nano silicon dioxide; 5-6 parts of bone glue powder; 0.2 to 0.3 part of zinc oxide; 0.8 to 1.2 parts of aluminum dihydrogen phosphate; 3 to 5 parts of metakaolin; 5-15 parts of stearic acid; 0.6 to 0.9 part of palmitic acid; 0.2 to 0.3 part of polyethylene glycol; 0.05 to 0.1 part of modified graphene oxide; aluminum dihydrogen phosphate is adopted to replace toxic lead nitrate to serve as a reinforcing agent, aluminum dihydrogen phosphate is non-toxic, odorless and environmentally friendly, and a composite system formed by aluminum dihydrogen phosphate, calcium carbonate and magnesium carbonate can improve the compressive strength and splitting tensile strength of concrete through chemical bonding; through synergistic matching of titanium dioxide and nano silicon dioxide, nano silicon dioxide can be used as a photon-generated carrier separation center, and the photocatalytic efficiency of titanium dioxide in a weak light environment is remarkably improved; by adding a small amount of modified graphene oxide, corrosion of steel bars is effectively delayed, and the corrosion inhibitor is suitable for corrosive environments such as seaside and salinized soil.

The application provides a process for reducing the content of arsenic in antimony concentrate, which comprises adding dextrin and hydroxyl polyacrylamide to inhibit arsenic in the ore slurry during the heavy dressing slurry mixing process, adding lead nitrate as an antimony activator, butyl ammonium as an antimony collector and pine oil as a foaming agent, so that the antimony in the heavy dressing slurry can float under the combined action of the above flotation reagents and the arsenic minerals are further inhibited, and the arsenic in the antimony concentrate can be removed by the heavy dressing more easily. The test results show that, compared with the process of single flotation or single heavy dressing, the process of adding flotation reagents to the heavy dressing operation can effectively reduce the content of arsenic in the antimony concentrate, the process equipment is simple, and the indexes are stable. In addition, the process does not use toxic reagents such as cyanide, is environmentally friendly and non-polluting, and can realize green and efficient separation of antimony and arsenic.

The present application relates to non-ferrous metal dressing technical field, specifically, it relates to antimony ore arsenic antimony separation and antimony recovery process based on secondary resource recovery, including the following steps: high arsenic pyrite concentrate is carried out grinding treatment; then the ground ore pulp is sent to the reverse flotation system, first, sodium carbonate is added to the ore pulp to adjust pH, then active carbon, sodium sulfide are added and stirred to mix, followed by adding xanthate, 2# oil, reverse flotation is carried out, antimony rough concentrate and arsenic removal sulfur concentrate are obtained; finally, the antimony rough concentrate is concentrated and sent to the positive flotation system, sulfuric acid is added to the ore pulp to adjust pH, then active carbon, lead nitrate, ammonium butyl dithiophosphate are added and stirred to mix, positive flotation is carried out, high-grade antimony concentrate is obtained, arsenic antimony separation and antimony recovery are completed through the sectional process design of secondary grinding, arsenic removal by reverse flotation and enrichment by positive flotation, combined with accurate reagent system and parameter control, the deep separation of arsenic and antimony in high arsenic pyrite concentrate and the efficient secondary recovery of antimony metal are realized.

The invention relates to the technical field of gold and antimony beneficiation, in particular to a high-arsenic and poor-antimony gold ore regulator and a method for recovering antimony by using the regulator. The adjusting agent comprises an adjusting agent A and an adjusting agent B; the regulator A comprises 35-45% of oxalic acid, 35-40% of aluminum sulfate, 10-15% of sodium fluosilicate and 5-10% of ammonium chloride; the regulator B comprises 5-15% of sodium humate, 10-20% of ammonium sulfate, 20-30% of sodium sulfite, 15-20% of calcium chloride and 20-40% of bleaching powder. When the raw ore pulp is subjected to gold-antimony mixed roughing, the regulator A is added, the flotation index equal to that when lead nitrate serves as an antimony activating agent can be obtained, and lead pollution can be eliminated; and a regulator B is added when the gold-antimony mixed pre-concentration ore is subjected to antimony roughing and concentration, poison sand in ore pulp is efficiently inhibited under the condition that the pH value is 5-6.5, then high-gold low-arsenic antimony concentrate with the qualified antimony grade and high-arsenic low-antimony gold concentrate with the antimony grade not exceeding the standard are obtained, and efficient comprehensive recycling of the high-arsenic poor-antimony gold ore is achieved.

The invention belongs to the field of photocatalytic nano materials, and discloses a defect-rich PbBiO2Cl ultrathin hollow bowl-shaped photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving 1-octyl-3-methylimidazolium chloride and triton X-100 in water to obtain a microemulsion A; adding bismuth nitrate pentahydrate and lead nitrate into a nitric acid solution to obtain a solution B; dropwise adding the solution B into the microemulsion A, uniformly stirring, and adding a glyoxal aqueous solution to obtain a mixed solution; and adjusting the pH value of the mixed solution to be alkaline by using a NaOH aqueous solution, and carrying out hydrothermal reaction to obtain the defect-rich PbBiO2Cl ultrathin hollow bowl-shaped photocatalyst. The prepared catalyst has good photocatalytic performance, and has good application prospects in the aspects of photocatalytic CO2 reduction and degradation of water pollutants.

The invention relates to a method for preparing a perovskite precursor lead iodide from secondary lead electrolysis ingot casting slag, which comprises the following steps: a grinding process: grinding the secondary lead electrolysis ingot casting slag into lead powder through a grinding mechanism, and separating the lead powder into a dissolving mechanism through a separating mechanism; a dissolving process: controlling the temperature in a dissolving mechanism to be 40-60 DEG C, adding an acetic acid solution, controlling the temperature to be 260-300 DEG C, and adding nitric acid and deionized water; a generation process: after carrying out suction filtration to obtain a lead nitrate solution, dropwise adding the lead nitrate solution into the sodium iodide solution in the generation mechanism, keeping the pH value of the mixed solution at 1-3, and controlling the temperature at 50-60 DEG C to react for 2-3 hours; and a drying process: washing the lead iodide mixed solution with deionized water, carrying out suction filtration, drying to obtain a lead iodide crude product, recrystallizing the lead iodide crude product, and drying to obtain the high-purity lead iodide. The invention solves the problems of resource waste, influence on production efficiency and environmental pollution caused by the fact that the existing secondary lead electrolysis ingot casting slag cannot be reasonably recycled.

The invention belongs to the technical field of agricultural biology, and particularly discloses application of mannose in enhancing plant lead tolerance and repairing lead-polluted soil. It is found for the first time that the tolerance of plants to lead stress can be remarkably improved by exogenously adding mannose, and lead-polluted soil is repaired. Mannose is prepared into a mannose aqueous solution, and the mannose aqueous solution is applied to the lead-polluted soil. An arabidopsis thaliana model proves that the mannose aqueous solution realizes a dual defense mechanism of synergistically activating plant chelation isolation and antioxidation. Under the stress of 300 [mu] M lead nitrate, the fresh weight and root length of arabidopsis thaliana are increased through mannose aqueous solution treatment, and leaf chlorosis and root inhibition caused by lead are reversed. The invention provides a technical scheme for solving the problems of high cost, high secondary pollution risk and the like of the existing lead-polluted soil remediation technology. By enhancing the tolerance mechanism of plants, the environmental risk of a chemical chelating agent is avoided, the method is suitable for ecological restoration of the lead-polluted soil, and a new scheme and technical support are provided for ecological restoration of the lead-polluted soil.