The process of extracting lead from old batteries

The process of extracting lead from old batteries

The process of extracting lead from old batteries mainly includes the following steps:

Battery crushing: First, crush and crush the waste batteries for subsequent processing. one

Acid washing: After crushing, the battery is immersed in an organic acid solution, and the lead acid, polyethylene glycol, and acid phases are stacked through electrochemical reactions to separate the lead.

Precipitation: Using chemical agents to precipitate lead ions to obtain pure lead.

Melting: Place the lead paste in a furnace and melt it at temperatures exceeding 1000 ℃. If coke or coal is used as fuel, it will produce a large amount of carbon dioxide, lead dust, and sulfur dioxide. two

Desulfurization: In the process of lead casting, sulfides may be produced and require desulfurization treatment. Usually, copper oxide and iron oxide are added to the melt to eliminate sulfides in the furnace. three

Cooling and pouring lead: The melted lead liquid is poured into the mold for cooling, and after solidification, the lead block can be poured out. four

Deslagging: To remove impurities such as copper and zinc from the surface of a lead block by gravity or centrifugal force.

Calcination: The lead block after slag removal is calcined to remove residual impurities. This process is also known as "coarse burning" because it is a prelude to producing high-purity lead blocks.

Fine drawing: Finally, other metal impurities in the lead are removed by melting and drawing to improve purity, and fine lead is used to manufacture spare parts or produce finished products such as lead bars and blocks.

It should be noted that the process of extracting lead from waste batteries will generate certain pollutants and waste residue. Therefore, it is necessary to strictly follow safety and environmental requirements to ensure that pollutant emissions meet relevant national environmental standards.