17results about "Red lead" patented technology

The present invention provides the use of a lead (IV)-containing compound for the preparation of a chalcogenide nanocrystal of lead, and a method of manufacturing a broadband chalcogenide nanocrystal of lead in a low-cost, size-controllable and scalable process comprising contacting a lead (IV)-containing compound with an organic acid and a chalcogen-containing agent.

This invention relates to a method for preparing monocrystalline lead oxide from waste lead paste using a low-temperature pyrometallurgical process, belonging to the field of resource recycling technology for waste lead-acid batteries. The invention involves removing waste positive and negative electrode plates from lead-acid batteries and washing them with water; peeling waste lead paste from the grids of the waste positive and negative electrode plates, grinding and sieving to obtain waste lead paste powder; mixing the waste lead paste powder with a desulfurizing agent, a desulfurization aid, and a crystal form control agent to obtain mixture A; calcining mixture A at 400-600℃ for 2-8 hours, followed by furnace cooling to obtain mixture B; washing and drying mixture B to obtain monocrystalline lead oxide, which is α-PbO, β-PbO, or Pb3O4. This invention directly uses waste lead paste from lead-acid batteries for a one-step low-temperature pyrometallurgical process to prepare monocrystalline lead oxide. The desulfurizing agent can directly desulfurize the waste lead paste, the desulfurization aid can lower the calcination temperature, and the crystal form control agent regulates the crystal structure of the generated lead oxide species, resulting in monocrystalline lead oxide with high purity and good crystallinity.

Provided herein is a composition comprising one or more of alpha lead oxide, beta lead oxide, metallic lead, Pb2O3, and Pb3O4, the composition comprising particles comprising sub-particles, the sub-particles having an average maximum size of from 10 to 300 nm. Also described herein are methods of making such compositions.

The application discloses a red lead semi-finished product integrated energy-saving preparation device, and belongs to the technical field of red lead preparation devices, which comprises a bin body, a horizontally arranged partition plate is arranged in the bin body, the bin body is divided into an oxidation cavity and a lead melting cavity by the partition plate, the oxidation cavity is arranged above the lead melting cavity, a powder outlet pipe is arranged on the top of the oxidation cavity, an air blower is arranged on the outer wall of the oxidation cavity, the air outlet of the air blower is communicated with the oxidation cavity, a liquid outlet is arranged on the partition plate and is communicated with the oxidation cavity and the lead melting cavity, two processes of red lead production are integrated, the red lead production process is reduced, and the labor is reduced, the production efficiency of products can be greatly improved, the occurrence of occupational hazards can be reduced by automatic conveying, the structure of the application is simpler, more reasonable and more scientific than that of a traditional red lead production device, and therefore the investment cost of equipment in the red lead production field is reduced.

The utility model relates to secondary oxidation equipment for yellow lead, which comprises an oxidation furnace, the oxidation furnace comprises a horizontally arranged oxidation furnace body and a conveying roller arranged in the oxidation furnace body, and one end of the conveying roller is connected with an output shaft of a driving motor; a resistance wire, refractory bricks and heat preservation cotton are sequentially arranged on the outer side of the oxidizing furnace body from inside to outside, a feeding port and an air inlet are formed in the upper portion of the end, away from the driving motor, of the oxidizing furnace body, an exhaust port is formed in the upper portion of the end, close to the driving motor, of the oxidizing furnace body, and a discharging port is formed in the lower portion of the end. According to the secondary oxidation equipment for the yellow lead, the yellow lead powder is conveyed in the horizontal oxidation furnace body through the conveying rollers, meanwhile, the oxidation furnace body is heated through the resistance wire, fresh air is introduced through the air inlet, the secondary oxidation effect is good, and the oxidation efficiency is high. Refractory bricks and heat preservation cotton are arranged outside the resistance wires for heat preservation, and heat loss is reduced.

The present invention discloses a method for preparing red lead using alloy lead, and belongs to the technical field of lead-acid battery production. The present invention uses a certain amount of lead-tin-antimony alloy lead as a raw material, produces red lead by alloy lead, strictly controls the alloy melting temperature and powder making temperature during production, reduces the burn-in loss of key additive elements, and ensures that the phase of α-PbO is more than 80%, and weak alkaline water is added during granulation, so that high-efficiency granulation and uniform particles can be achieved, and then red lead is oxidized. After adding red lead in the paste stage, the present invention does not need to add tin-containing and antimony-containing compounds, so as to achieve the reduction of battery production costs from the perspective of the entire industrial chain.

The invention discloses a method for recovering lead tetraoxide from waste lead plaster, which comprises the following steps: (1) obtaining a waste lead plaster material, and drying to obtain a lead plaster sample; (2) carrying out acid leaching pretreatment on the waste lead plaster: carrying out acid leaching on the lead plaster sample obtained in the step (1) by using dilute sulphuric acid, wherein the lead plaster sample subjected to acid leaching comprises the main components of PbSO4 and PbO2; (3) desulfurization reaction: leaching the lead plaster sample in the step (2) by using an ammonium oxalate solution to obtain a solid mixture of lead oxalate and lead dioxide; and (4) roasting: roasting the solid mixture in the step (3) to obtain lead tetraoxide. According to the method, the ammonium oxalate solution serves as a desulfurizing agent to directly desulfurize the lead plaster, the obtained solid mixture is directly roasted to obtain a lead tetroxide product, lead dioxide in the waste lead plaster is fully utilized, and the defects that in the process of recovering lead from the waste lead-acid storage battery, the usage amount of chemical reagents is too large, the technological process is long, and secondary pollution is caused are overcome; the method is suitable for industrial production.

A composition is provided comprising one or more of alpha lead oxide, beta lead oxide, metallic lead. Pb2O3 and Pb3O4, the composition comprising particles comprising sub-particles, the sub-particles having a mean greatest dimension of from 10 to 300 nm. Methods of making such a composition are also described.

The present invention provides the use of a lead (IV)-containing compound for the preparation of a chalcogenide nanocrystal of lead, and a method of manufacturing a broadband chalcogenide nanocrystal of lead in a low-cost, size-controllable and scalable process comprising contacting a lead (IV)-containing compound with an organic acid and a chalcogen-containing agent.

A device for deep oxidation of yellow lead comprises a feed hopper, an oxidation reactor and a discharge pipe which are sequentially connected with one another from top to bottom, a feed port is formed in the upper end of the feed hopper, and a discharge port is formed in the lower end of the discharge pipe; a valve is arranged on one side, close to the discharge hole, of the lower end of the discharge pipe; the feed hopper and the oxidation reactor are provided with a plurality of mixed gas supply pipes for supplying gas into the feed hopper and the oxidation reactor, the plurality of mixed gas supply pipes are uniformly distributed side by side along the vertical direction, one ends of the plurality of mixed gas supply pipes extend into the feed hopper and the oxidation reactor, and two openings at the other ends of the plurality of mixed gas supply pipes are respectively connected with a cold air source and a hot air source; an air supply pipe for supplying air to the discharging pipe is arranged on the discharging pipe, one end of the air supply pipe extends into the device, and an opening in the other end of the air supply pipe is connected with a cold air source. The device has the advantages of low energy consumption, high oxidation efficiency and freely adjustable oxidation degree, and meets the production requirements of lead oxide with different oxidation degrees.

A composition is provided comprising one or more of alpha lead oxide, beta lead oxide, metallic lead, Pb2O3 and Pb3O4, the composition comprising particles comprising sub- particles, the sub-particles having a mean greatest dimension of from 10 to 300nm. Methods of making such a composition are also described.

The present invention provides the use of a lead (IV) containing compound to prepare a lead chalcogenide nanocrystal and a method for producing broadband lead chalcogenide nanocrystals in a low cost, size-controllable and scalable method, the method comprising contacting a lead (IV) containing compound with an organic acid and a chalcogen-containing reagent.

Compositions are provided that include one or more of alpha lead oxide, beta lead oxide, metallic lead, Pb2O3, and Pb3O4, the compositions comprising particles that include subparticles, the subparticles having an average largest dimension of 10 to 300 nm. Methods of making such compositions are also described.

The present invention provides the use of a lead (IV) containing compound to prepare a lead chalcogenide nanocrystal and a method for producing broadband lead chalcogenide nanocrystals in a low cost, size-controllable and scalable method, the method comprising contacting a lead (IV) containing compound with an organic acid and a chalcogen-containing reagent.

The invention discloses a method for preparing lead oxide powder containing barium element by using alloy lead, and belongs to the technical field of lead storage battery production. The invention prepares PbO powder containing barium element by preparing lead-barium alloy and using the alloy through process control. By using the powder and paste, the lead powder has very good dispersion performance, is not easy to agglomerate, and the battery batch consistency is very ideal. At the same time, the introduction of barium element is realized. Moreover, the barium element introduced in this way is not easy to separate from the active material during the cycle because it is embedded in the PbO crystal structure, which delays the passivation process of the negative electrode. During the entire life, the initial low temperature performance of the battery and the low temperature retention ability during the cycle can be improved.

The present invention discloses a porous red lead and a preparation method and application thereof, and belongs to the technical field of lead-acid battery production. The preparation method of the present invention, by adding hydrophilic fibers, in the oxidation stage, the spherical particles retain the pore structure left after the fibers are ashed, and the structure provides a gas channel for the subsequent lead oxide conversion inside the spherical particles, reduces the time of powder oxidation, and improves production efficiency. The prepared porous red lead, after being added to the positive electrode, effectively improves the pore structure of the positive electrode active material, especially the abundance of micropores, increases the reaction area of ​​the active material, and improves the utilization rate of the active material.

The present invention belongs to the technical field of lead storage battery production. Disclosed are a porous-structure red lead, and a preparation method therefor and the use thereof. In the preparation method of the present invention, by adding hydrophilic fibers, the pore channel structure, which is left after the fibers are ashed, of spherical particles is maintained during an oxidation stage, and the structure provides a gas channel for subsequent conversion of lead oxide inside the spherical particles, thereby shortening a powder oxidation time and improving the production efficiency. By adding the prepared porous-structure red lead to a positive electrode, the pore structure of a positive electrode active material is effectively improved; and particularly, the rich micropores increase the reaction area of the active material and improve the utilization rate of the active material.