Varta Batterie Aktiengesellschaft

Thomas Czerny

August Winsel

Hans Von Dohren

Kurt Ziegler, Deceased

Lothar Losch

Hans Sauer

Rainer Jostes

Lead oxide is used for neutralizing the sulfuric acid wastewater received from washing charged (formed) electrodes during lead battery production. The neutralization product, including lead sulfate and excess lead oxide, is returned directly to production of the active mass paste. The mother liquor, after a possible use as cleaning water, is subjected to another neutralization with lead oxide, separate from the wastewater received from the electrode washing procedure in view of its possible content of impurities. The resulting lead sulfate is sent to a metal-processing facility for recycling. The neutral mother liquor, after the removal of lead residues by conventional precipitation methods and filtration, is discharged as treated water.

Process and apparatus for treating wastewater from lead battery

Catalytic material in powder form flows downwardly along a vibratory spiral conveyor chute, while gas flows counter to the powder, preferably in excess. Mixing ramp arrangements may be provided in the chute.

Processing of catalyst powder

Heating for a vibratory spiral conveyor used to react powdery and gaseous substances is accomplished by an expanded metal resistance heater element positioned between adjacent turns of the conveyor.

Vibratory spiral conveyor chute and a resistance heating element

Powdery material flows downwardly along a vibratory spiral conveyor chute, while gas flows counter to the powder, preferably in excess. Mixing ramp arrangements are provided in the chute. These involve inclined ramp surfaces dividing the powder stream into two layers, and provisions for causing the initially uppermost layer to tumble down onto the chute bottom while the initially lowermost layer is still supported on its ramp. The latter then drops down, too, and now becomes the uppermost layer.

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Glashutten, Germany

Thomas Czerny