9 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 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 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 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.