5 results about "Lead sulfide" patented technology

The application discloses a kind of high oxidation rate lead-zinc oxide ore aerated sulphidation flotation and tailings discharge process, belong to mineral processing technical field.The method includes the following steps: grinding to lead-zinc oxide ore raw ore, obtain slurry;Sodium sulfide is added to slurry, and under the condition of aerated stirring, sulphidation reaction is carried out, and sulphidation slurry is obtained;Collector and foaming agent are added to sulphidation slurry, and flotation is carried out, and lead concentrate and zinc concentrate are obtained.The application introduces forced aerated stirring in the sulphidation process, strengthens the mass transfer process among gas-liquid-solid three phases, promotes the generation of dense, stable lead sulfide film on the surface of lead oxide minerals, solves the problem of low sulphidation efficiency of traditional sulphidation process.The application is used to treat refractory lead-zinc oxide ore containing Pb 5.59%, Zn 44.02%, oxidation rate more than 90%, and closed-circuit test can obtain qualified lead concentrate with lead grade of 60.72% and lead recovery rate of 79.53%, while lead flotation tailings directly become zinc concentrate with zinc grade of 46.33% and zinc recovery rate of 98.41%, realizing efficient separation of lead and zinc and tailings discharge.

The application belongs to the technical field of neuromorphic computing devices, and particularly relates to a temperature programmable neuromorphic device based on lead sulfide colloidal quantum dots and application. The device comprises an insulating substrate, a planar gap electrode, a lead sulfide colloidal quantum dot photosensitive film and a temperature control module. By setting the working temperature to control the release kinetics of the trap state charge in the photosensitive film, the device has different photocurrent decay characteristics at different temperatures, realizing reversible switching of the fast detection and long-term storage modes. The device can be used for reservoir computing, and realizes time sequence information processing through the historical dependence response to time sequence light pulses. The application solves the problem of fixed and unadjustable response time scale of the existing device, and has the advantages of simple structure, good process compatibility and wide response dynamic range.

The application discloses a galena combined inhibitor and a use method thereof, and the combined inhibitor comprises iron sulfate, sodium nitrate and jarosite, and the mass ratio of the amount of the iron sulfate, the sodium nitrate and the jarosite is 20:(4-10):(1-2). The combined inhibitor can be applied to separation of copper-lead mixed concentrate to realize lead inhibition and copper floating, and the combined inhibitor does not need to be removed. In an acid medium, after the combined inhibitor acts, not only can the combined inhibitor decompose the adsorbed reagent on the surface of the copper-lead mixed concentrate, but also can promote the galena surface to be oxidized to generate hydrophilic PbSO4 and PbO, while the chalcopyrite surface is oxidized to generate hydrophobic elemental sulfur (S 0 ), thereby expanding the floatability difference between the copper-lead sulfide, the jarosite is selectively adsorbed on the surface of the galena, further reducing floatability of the lead, and improving the copper-lead separation efficiency. The copper concentrate and the lead concentrate obtained by the application have high recovery rates, low mutual content, reusable acid liquid, low cost and environmental protection.

This invention relates to the field of chemical production, and particularly to a method for hydrometallurgical refining of lead from lead sulfide concentrate, comprising the following steps: Step S1: Catalytically oxidizing lead sulfide concentrate to obtain a first filtrate and a first filter residue; Step S2: Using an alkaline magnesium-based conversion agent to convert lead sulfate in the first filter residue into lead carbonate, obtaining a second filtrate and a second filter residue containing lead carbonate; Step S3: Leaching the lead carbonate in the second filter residue using an acetic acid solution and precipitating it with carbon dioxide to obtain high-purity lead carbonate; Step S4: Leaching the high-purity lead carbonate using a fluorosilicic acid solution and electrolyzing it to obtain metallic lead product. Compared with the prior art, the reagents used in this invention are low-cost and renewable, the reaction conditions are mild, no wastewater is generated, and the obtained metallic lead product has high purity.

This utility model discloses a lead sulfide infrared detector, including a base with several pins fixed on it. A cap is provided on the base, and the top wall of the cap has an opening. A transparent window is fixed to the cap to close the opening. A thermoelectric cooler is disposed inside the cap, with its hot end connected to the base. A photosensitive element is disposed at the cold end of the thermoelectric cooler, and a temperature sensor is also disposed at the cold end of the thermoelectric cooler. The temperature sensor and the thermoelectric cooler are electrically connected to a control circuit through corresponding pins, and the photosensitive element is electrically connected to a processing circuit through corresponding pins. This device can regulate the temperature of the photosensitive element, keeping it below a set temperature, thus ensuring stable operation.