37 results about "Lead nitrate" patented technology

The invention provides a preparation method of Portland cement for stably curing heavy metal lead. The Portland cement is prepared from the following raw materials in parts by weight: 80-100 parts of ordinary Portland cement, 5-20 parts of low-activity metakaolin, 5-10 parts of lead nitrate powder and 40-50 parts of water. The preparation method comprises the following steps: adding lead nitrate powder into water, stirring to obtain a uniform water solvent, slowly adding the uniform water solvent into a uniform mixture of cement and low-activity metakaolin, then adjusting working parameters of a rotary mixer for mixing to obtain uniform mixed slurry, and finally forming and curing according to the national standard. The Portland cement capable of stably curing the heavy metal lead can be obtained. The raw material adopts industrial solid waste low-activity metakaolin as an auxiliary cementing material, the industrial waste is reasonably utilized, the use of Portland cement is reduced, the engineering cost and energy consumption are reduced, and meanwhile, the Portland cement material with good capability of stably curing heavy metal lead is prepared by improving the internal structure.

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.

The invention discloses a method for beneficiating uranium-containing gold ore. According to the mineral composition characteristics of the uranium-containing gold ore and the distribution characteristics of useful minerals, the uranium-containing gold ore is crushed, ground and classified, the coarse-grained ore is firstly recovered by a shaking table, and then a flotation agent composed of a water glass inhibitor, a sodium hydrosulfide activator, an amyl xanthate and an alkylaminocarboxylic acid combined collector is used to flotate and recover the gold; the fine-grained ore is recovered by centrifugal reselection, and then the coarse-grained and fine-grained tailings are combined, and a flotation agent composed of a lead nitrate and ferric sulfate combined activator, an isooctyl phosphate and a tetradecylamine combined collector is used to flotate and recover uranium, and finally the uranium is further recovered by strong magnetism, which not only realizes the comprehensive recovery of gold and uranium, but also can discard most of the tailings. The gold grade in the total gold concentrate is 56.34g / t, the recovery rate is 97.08%, the uranium grade in the total uranium concentrate is 0.196%, the recovery rate is 70.59%, the tailings yield is 87.06%, the gold grade is 0.14g / t, and the uranium grade is 0.003%.

The invention discloses a system and a measuring method for measuring the content of hydrogen sulfide in a sample by taking a lead nitrate standard solution as a titrant after the hydrogen sulfide in crude oil and liquid sulfur is purged and absorbed and using an automatic potentiometric titration method to calculate the content of the hydrogen sulfide in the sample. The invention provides a gas purging and absorbing system for measuring the content of hydrogen sulfide. The gas purging and absorbing system comprises a gas source, a gas drying device, a gas generating device, a gas washing device and a gas absorbing device which are connected in sequence, a flow meter and a control valve are arranged on a connecting pipeline of the gas source and the gas drying device; a stirring device is arranged in the gas generating device, and a temperature-controllable heating and heat-preserving device is arranged outside the gas generating device. The method is small in interference degree, high in automation degree, capable of greatly improving precision and accuracy, simple, convenient and rapid.

The invention discloses a method for preparing smithsonite-cerusite through carbonate curing and application. According to the method, a mixed solution is prepared from a lead nitrate solution and a zinc nitrate solution according to different proportions, and an ammonium bicarbonate solution is used as a precipitator. Adding a precipitant into the mixed solution, introducing a proper amount of carbon dioxide gas in the reaction process, and controlling the proportion of the mixed solution, the dropping speed of the precipitant, the reaction temperature and the aging time to obtain the smithsonite-cerusite series solid solution. During application, a proper amount of the smithsonite-cerusite series solid solution is taken and dissolved in three different aqueous solutions at the temperature of 25 DEG C, and evolution of the interaction process of the smithsonite-cerusite series solid solution in the aqueous solutions is understood. The smithsonite-cerusite series solid solution obtained by the method has the advantages of low preparation cost, simple experimental operation, mild reaction conditions and the like. Wherein more than 90% of zinc in the aqueous solution is removed from the smithsonite, and the removal rate of lead in the aqueous solution by the cerusite is close to 100%.

The invention discloses a beneficiation method for recovering tungsten from polymetallic tungsten ore tailings, which is characterized by comprising the following steps: carrying out strong magnetic separation to obtain strong magnetic concentrate and strong magnetic tailings; concentrating the strong magnetic concentrate until the concentration is 30% of ore pulp, adding sodium carbonate until the pH value of the ore pulp is 7.0-9.0, then adding sodium hexametaphosphate, OS, salinized water glass, lead nitrate and a tungsten catching agent, mixing, and feeding into a flotation machine to obtain wolframite concentrate and wolframite tailings; the strong magnetic tailings are blended into ore pulp with the concentration being 30%, oxalic acid, water glass and a catching agent LLR are added, the mixture enters a flotation machine after being mixed, and scheelite-fluorite concentrate and co-flotation tailings are obtained; and the scheelite-fluorite concentrate is concentrated until the concentration is 30%, and then one-roughing and three-refining centrifugal reselection is carried out, so that scheelite concentrate and fluorite concentrate are obtained. Under the acidic condition, the flotation effect of fluorite is enhanced, interference on scheelite flotation is reduced as much as possible, and the recovery rate and grade of wolframite concentrate and scheelite concentrate are both improved.

The invention provides a waste lead dioxide anode resource recycling method which comprises the following steps: pretreatment: cleaning a waste lead dioxide anode to remove electrolyte crystals on the surface; the pretreated waste anode is placed in a hydrochloric acid solution to react for 30-50 min, and surface metal oxide is removed; the waste anode is placed in a solution B and soaked for 20-40 min at the normal temperature, part of lead dioxide is dissolved, and the solution B comprises 13-18 wt% of nitric acid and 13-18 wt% of hydrogen peroxide; adding nitric acid and hydrogen peroxide to enable the mixed solution to contain 23-27wt% of nitric acid and 23-27wt% of hydrogen peroxide, heating the mixed solution to 50-60 DEG C, continuously reacting for 25-40 minutes under the condition of blowing air, and dissolving the residual lead dioxide to obtain a leaching solution; the leaching liquid is repeatedly used until the concentration of lead nitrate in the leaching liquid reaches 250-320 g / L, and the leaching liquid is conveyed to an electroplating production line to be recycled after being filtered; and the treated titanium base material is cleaned and then is electroplated again for use. The waste lead dioxide anode resource recycling method provided by the invention is a low-temperature, high-efficiency and low-pollution regeneration technology, and can realize the repeated use of a titanium substrate and the recycling of a lead nitrate solution.

The invention discloses a method for preparing anhydrite-lead vitriol by curing lead with sulfate and application of the anhydrite-lead vitriol. According to the method, sodium sulfate reacts with calcium nitrate and lead nitrate to obtain a lead-containing gypsum solid solution, and the lead-containing gypsum solid solution is contained into a crystal structure of calcium sulfate by adjusting the concentration of lead, so that toxic metal lead dissolved in the environment is removed. The curing mechanism is that when a new solid phase forms a continuous and uniform layer on a mineral substrate, the dissolution of toxic metals is obviously hindered. The anhydrite-lead vitriol prepared by removing water molecules from the lead-containing gypsum series solid solution at high temperature can be used for sealing toxic metal lead. During application, a proper amount of anhydrite-lead vitriol series solid solution is taken and dissolved in three different aqueous solutions under the condition of 25 DEG C, and the evolution of the interaction process of the anhydrite-lead vitriol series solid solution in the aqueous solutions is understood. The anhydrite-lead alum series solid solution obtained by the method has the advantages of simplicity in operation, low cost, easiness in control and the like.

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 invention relates to a flotation separation method for high-arsenic antimony sulfide, and belongs to the technical field of mineral processing. Ore grinding operation is conducted, ore is crushed to 10-20 cm, sodium sulfide is added into the ore, ball-milling ore grinding is conducted, the ore grinding concentration is controlled to range from 60% to 80%, the graded overflow fineness is controlled to range from 70% to 80%, and the overflow ore pulp concentration ranges from 25% to 30%; ammonium oxalate is added at an overflow ore pulp outlet; sodium tannate is continuously added into the ore pulp, butyl xanthate and MIBC are added for pulp mixing, and arsenic concentrate and antimony-containing tailings are obtained through arsenic flotation; and lead nitrate or ammonium nitrate is added into the antimony-containing tailings, butyl xanthate and MIBC are added for size mixing, flotation of antimony minerals is carried out, and a high-quality low-arsenic antimony sulfide concentrate product is obtained. The method is technically characterized in that under the action of a combined inhibitor sodium sulfide, ammonium oxalate and sodium tannate, antimony sulfide minerals are effectively inhibited, the arsenopyrite is activated at the same time, reverse flotation is conducted on the arsenopyrite through a collecting agent, and effective separation of the arsenopyrite and antimony sulfide is successfully achieved.

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 method for preparing biological nano-lead selenide quantum dots by using Bacillus sp HZ3, and specifically relates to the field of microbial application technology. The Bacillus sp HZ3 selected by the invention can efficiently convert lead nitrate and sodium selenite to produce nano-lead selenide PbSe. The preparation method comprises the following steps: (1) preparing bacterial culture solution; (2) fermentation culture; (3) adding sodium selenite and lead nitrate; (4) adding an inducer; (5) inducing synthesis of biological nano-lead selenide; (6) separating and extracting lead selenide quantum dots. Beneficial effect: According to the characteristics of Bacillus sp HZ3 in synthesizing lead selenide, the invention adds an inducer that helps to enhance the synthesis effect of nano-lead selenide during the culture process, and maximizes the synthesis efficiency of nano-lead selenide by combining high temperature culture-low temperature induction culture-high temperature culture.

The invention provides corrosive liquid for detecting the proportion of a skip plating area of a copper-plated welding wire and a detection method of the corrosive liquid. The corrosive liquid comprises a hydrochloric acid solution and a lead nitrate solution; the hydrochloric acid solution is prepared by mixing 50-80 ml of analytically pure concentrated hydrochloric acid and 50 ml of water, and the lead nitrate solution is prepared from 5-10 g of analytically pure lead nitrate and 100 g of water; the detection method comprises the steps of sample preparation, chemical corrosion and metallographic microscope observation and analysis. The specific operation comprises the steps that a sample is soaked in the hydrochloric acid solution for 15-30 s, the sample is soaked in the lead nitrate solution for 10-20 s after being washed and blow-dried through alcohol, and after being washed and blow-dried through alcohol, the proportion of the skip plating area is calculated through analysis software of a metallographic microscope according to different proportions of organizational structures. The corrosive liquid and the detection method provided by the invention can completely and clearly display the skip plating area, can quantitatively evaluate the skip plating quality of welding wire copper plating, and have the characteristics of low detection cost, rapidness and simplicity.

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 invention discloses a preparation method of a lead copper salt catalyst, comprising the following steps: (1) preparing a deoxygenated 2,4-dihydroxybenzoic acid aqueous solution; (2) adding an initiator to the 2,4-dihydroxybenzoic acid aqueous solution to obtain a first solution; (3) dropwise adding a mixed aqueous solution of deoxygenated lead nitrate and copper nitrate to the first solution, and washing with a precipitate to obtain the lead copper salt catalyst. The lead copper 2,4-dihydroxybenzoic acid prepared by the present invention has good batch stability, effectively solving the problem that 2,4-dihydroxybenzoic acid has many types of complexes as a starting material and a complex spatial distribution. The preparation method in the present invention is simple and reliable, and has good application prospects.

The utility model relates to the technical field of lead-containing standard solution preparation, in particular to a preparation device for a lead-containing standard solution, which comprises a tank body which comprises a preparation tank. The cam is driven by the rotating rod to rotate, the cam can extrude the connecting block, then the connecting block drives the sleeve rod to ascend, the stirring shaft drives the stirring rod to ascend, and in cooperation with the elastic property of the first spring, when extrusion on the connecting block is cancelled in the rotating process of the cam, the stirring shaft can rotate; a sleeve rod can drive a stirring shaft and a stirring rod to descend, so that through cooperation of a cam and a first spring, the stirring shaft and the stirring rod can simultaneously perform lifting motion in the rotating process, the stirring rod can stir lead nitrate and a solvent at different positions, the mixing effect can be improved, lead nitrate can be better dissolved, and the practicability is high. Meanwhile, the stirring plate ascends and descends along with the stirring shaft, and a solution at the bottom of the preparation tank can be lifted.

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 belongs to the technical field of aerogel preparation, and particularly relates to a preparation method of radiation-resistant lead-doped rare earth oxide composite aerogel, which comprises the following steps: dissolving rare earth nitrate or rare earth chlorine salt in a water-alcohol mixed liquid phase system with a certain volume ratio, fully stirring to form a homogeneous phase system, and drying to obtain the radiation-resistant lead-doped rare earth oxide composite aerogel. Then a certain amount of lead nitrate is added, the mass fraction of generally added lead is 0.01%-8%, rare earth is one or more of cerium, samarium, europium, erbium, lanthanum, yttrium and ytterbium, alcohol is one or more of methanol, ethanol and isopropanol, and the volume ratio of water is 10%-90%. According to the invention, pulverization and slag falling of the aerogel material can be effectively weakened through lead doping and silicon deposition, the stability of the composite material is effectively improved, the requirements of heat preservation and radiation shielding of a nuclear reactor loop system in the nuclear industry can be met, and effective support is provided for energy conservation, consumption reduction and safe and stable operation of a nuclear reactor in the nuclear industry.

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 utility model relates to a device for composite electrodeposition of lead dioxide, and belongs to the technical field of electrodeposition. The device comprises an electrolysis device unit, a low tank unit and a high tank unit, the electrolysis device unit comprises an electrolytic tank, a first isolating membrane is vertically arranged in the electrolytic tank, an electrolysis area and a lead nitrate plating solution circulating area are arranged on the two sides of the first isolating membrane respectively, a pneumatic stirring device is arranged at the bottom end of the first isolating membrane, and a bottom plate of the electrolysis area of the electrolytic tank is an inclined plate; two conductive copper bars are arranged at the top end of the electrolytic bath, the two conductive copper bars are externally connected with the positive electrode and the negative electrode of a rectifier respectively, an anode plate and a cathode plate are alternately inserted in an electrolysis area of the electrolytic bath, and two conductive heads on conductive beams at the top ends of the anode plate and the cathode plate are electrically connected with the rectifier through the two conductive copper bars respectively; the electrolytic bath lead nitrate plating solution circulating area is communicated with the lower tank unit, and the lower tank unit is communicated with the elevated tank unit through a circulating magnetic pump. The device enables the capacity and quality of composite electrodeposition lead dioxide to be stable and reliable, and is convenient to operate.

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.

Use of nano-sized lead borate compounds for treatment purposes due to their selective anticancer activity on p53 mutant breast cancer cell line, T47D is disclosed. The method of synthesizing nano-sized lead borates of the present invention comprises the steps of preparing a borate buffer solution by sodium hydroxide and boric acid, dissolving lead nitrate (and preferably PEG) in distilled water by stirring, mixing the borate buffer solution with the lead nitrate (and preferably PEG) solution, washing the resulting solution with distilled water and drying to remove the impurities.

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.

According to the technology for reducing the arsenic content in the antimony concentrate, dextrin and hydroxyl polyacrylamide are added in the reselection pulp mixing process to inhibit arsenic in ore pulp, lead nitrate is added to serve as an antimony activating agent, ammonium butyrate serves as an antimony collecting agent, and terpenic oil serves as a foaming agent; under the combined action of the flotation reagents, antimony in the gravity concentration ore pulp can float upwards, arsenic minerals are further inhibited, and arsenic in antimony concentrate can be better removed through gravity concentration. Test results show that compared with a process singly adopting flotation or reselection, the method adopting the reselection operation to add the flotation reagent can effectively reduce the content of arsenic in the antimony concentrate, process equipment is simple, and indexes are stable. In addition, cyanide and other reagents with high toxicity are not adopted in the process, environmental protection and no pollution are achieved, and green and efficient separation of antimony and arsenic can be achieved.