Desulphurization reactor for lead battery recycling

The desulphurization reactor, a stirred tank reactor, is part of the paste desulphurization plant in the lead battery recycling process with recovery of anhydrous sodium sulphate through intermediate crystallization to Glauber’s salt.

The fundamental desulphurization reaction of lead sulphate into lead carbonate (carbonatation reaction) through the adding of sodium carbonate takes place In the desulphurization reactor at pH conditions and controlled temperature.

The desulphurization reactor is composed of:

  • A cylindrical tank with vertical axe and conical bottom;
  • An internal cylindrical, coaxial, shell and tube heater, feeded by pressured steam;
  • An axial stirring shaft on which stirring palettes are fitted.

All parts that are in contact with the reaction elements are realized in stainless steel. On the desulphurization reactor’s cover there are gaps for the feeding of the paste, for the incoming water and for the controlled dosage of the sodium carbonate, while on the conical bottom there are the discharging outlets for the collecting of the lead carbonate.

The attachments for the entrance and the exit of the liquid that feeds the heater and for the process sensors (for pH, temperature and level control) are located on the side of the tank. The base of the tank is sustained by a system of three gravimetric cells which make it possible to know the quantity of loaded suspension at any moment and, consequently, to control its density anytime in order to obtain an optimal solid/liquid relation.

To guarantee an efficient and homogeneous suspension the stirring palettes are fixed on the shaft in groups of three and in three different positions and have an inclination suitable to create an upward flow, while the rotating speed of the shaft is controlled by operating the inverter of the electric motor.

The motor of the desulphurization reactor for lead battery recycling can be activated through the monitoring system developed on PC, both in manual and automatic mode. In manual mode start/stop is controlled by the user, while in automatic mode start/stop will be managed by the control software developed on PLC. In both cases the actual supply will only be present if the disconnector placed on board of the machine is not in the service position.

Desulphurization Reactor datasheet

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Desulphurization cost analysis

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Desulphurization Reactor RD 200
Nominal capacity 26 m3
Body material  AISI 304
Bottom thickness  10 mm
Wall thickness 5 mm
Agitator type mixer with three-bladed propellers
Heating solution system pipes crossed by steam
Dimensions (DxH) 3200x5000 mm
Weight 4000 kg
Installed power 11 kW
Rotating speed 40 rpm
Operating temperature 40 °C
No. of load cells  3



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