4 results about "Lead nitrate" patented technology

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 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.

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 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.