Selection - breaking - separation of accumulators

Used accumulators are collected in recycling units in properly designed spaces for first sorting and load control.

This phase of screening is necessary to remove possible incompatible materials (nickel-cadmium accumulators, ferrous parts, various wastes). The accumulators are loaded onto conveyor belts and through a hopper, shipped to their crushing and shredding areas.

At the end of this phase, we have lead paste, partition meshes, battery poles, polypropylene mix and plastic. The lead paste, in the form of sludge, is recovered in the filtrate unit.

The usual lead concentration is about 99% in metallic form and is recovered by redox in cylindrical melting furnaces. The dividing grid and poles are driven into the melting furnace.

The polypropylene at the exit from the separator is recovered by air separation and flotation and sent for shredding.

From the plastic mix, a part, after rinsing, clean and free from any residual materials, is sold as a product to plastic makers. While the remainder, at most polyethylene, is recovered or dispatched for deposition.

diadikasia anakiklosis
Melting and reduction of metallic compounds

From the melting and reducing furnace, lead and rust are continuously exported. The processes taking part in this phase, synthetically can be described:

  • reduction of oxides and lead sulphate with carbon
  • release of lead, which is found as lead sulphate, using sodium carbonate and iron

The operating temperature in this phase is greater than 1,100 ° C and is achieved by the addition of liquid oxygen, gas or diesel.

Cleaning

The lead exiting the oven is at 900 ° C and must be cleaned to obtain the desired degree of purity or the corresponding metals added to obtain the desired composition as an alloy.

Finally, the processes that are being developed in this phase are:

  • removal of surface oxides
  • partial or total removal of copper
  • partial or total removal of tin
  • partial or total removal of the antimony
  • controlled addition of metallic elements for the desired alloy composition
Processing of electrolyte in recycling facilities

The electrolyte treatment of the accumulators follows the following schematic process:

  • battery electrolyte collection and acid production solutions
  • neutralizing solutions
  • processing
  • separation (sludge promoted to lead recovery furnaces)
  • sand filtering
  • fraction as waste and the remaining quantities are going to be re-used in the plant

The installations of the recycling units operate with corresponding phases of work, taking into account the quantities and organization of production work required for the recycling of batteries and protection from gaseous and liquid pollution.