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LEAD DIVISION

crystallizer FOR LEAD BATTERY RECYCLING

The crystallizer for lead battery recycling permits to recover anhydrous sodium sulphate throughout intermediate crystallization to Glauber’s salt.

lead.stcitaly.com


CRYSTALLIZER

OPERATING PRINCIPLE

The anhydrous salt crystallizer is a fundamental part of the desulphurization plant of lead battery paste. The crystallizer carries out the crystallization of a watery sodium sulphate solution and the accretion of the crystal grains by reduction solubility of salt Na2SO4 throughout increasing of the solution’s temperature. The crystallizer for lead battery recycling is realized completely in stainless steel AISI 304, and is composed by following parts: A cylindric body, that receives from the top the solution to be treated. The sedimentation zone in this body permits to draw off continuously from the top the clarified part of the solution. This part is sent to an external device that concentrates it throughout evaporation. The saturated solution re-enters in the cylindric body containing in suspension the crystallization germs of Na2SO4 · H2O; A shell and tube exchanger, in the cylindric body, feeded with steam, that releases thermal energy to the crystal germ solution. The heating causes a supersaturation of the system (driving force), supporting the new nucleation that the accretion of the crystalline grains presents in suspension with consequent precipitation of bigger crystals; A propeller agitator. This agitator maintains in mechanical agitation the suspension and permits the accretion of the crystals up to the desired size. In this way it is possible to carry out a classification of the created crystals. The agitator is moved by an electric triphase motor and its speed is controlled by an inverter; A conical bottom with a final stem for the crystal collecting. A pump draws the suspension containing the crystals from the crystallizer’s bottom and sends it to a centrifuge for the final separation. The process is continuously controlled throughout temperature and pressure sensors. The motor of the crystallizer reactor for lead battery recycling can be activated via the monitoring system developed on PC, both in manual and automatic mode. In particular, in manual mode start / stop is controlled by the user, while in automatic 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 the machine is not in the service position.

CRYSTALLIZER TECHNICAL SPECIFICATIONS Maximal amount of space Diameter/Height

1600x4200 mm

Weight

1000 kg

Capacity

3,5 m3

Materials

Aisi 304

Electric Feeding

400 VOlt 3Ph 50 Hz

Max Power

2,2 kw

Max Electric Power

6 Ampére

Protection Grade IP

IP55

N° Rotations/min

500 rpm

Noise

70 dB(A) at 1 m distanza

STC srl LEAD DIVISION

Via A. Murri, 22 (Z.I.) • 72023 Mesagne (BR) • Italy Tel/Fax: (+39) 0831 738018 • www.stcitaly.com • info@stcitaly.com

lead.stcitaly.com

Crystallizer for lead battery recycling  

The crystallizer for lead battery recycling permits to recover anhydrous sodium sulphate throughout intermediate crystallization to Glauber’...

Crystallizer for lead battery recycling  

The crystallizer for lead battery recycling permits to recover anhydrous sodium sulphate throughout intermediate crystallization to Glauber’...

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