Lead oxide is a general term & can be used to describe either –
Lead Monoxide – PbO – Litharge
Lead Tetroxide – Pb3o4 – Red Lead – Brilliant Orange Red Pigment.
Black or Gray Oxide – 70% PbO + 30% Metallic Lead
Red Lead is used in
Ferrous Metal Protective Paints
Stationary / Traction / Tubular Plate Batteries
Crystal Glass
Television Tubes
Glazes
Red lead forms through an oxidation process when the raw material (lead oxide from ball mill) is heated to around 450oC in a furnace. In the oxidation process, the controlling has to be done of –
Lead Oxide
Oxygen
Temperature
Time
After the desired % of Red Lead has been reached, it is discharged & ground in a low impact hammer mill to adjust for particle size, distribution, acid adsorption, apparent density etc.
Process: -
A vertical agitator is used for constant mixing of powder inside the furnace. A vertical shaft supports & turns agitator arms to stir the batch lying on top of furnace.
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