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Abstract
Parkes’ process crusts were vacuum distilled using a shortened Pidgeon retort. Zinc was effectively removed below 800°C and re-covered as a zinc sheet easily stripped f rom the furnace liner. Lead distillation required about 950°C and the resulting lead condensate tended to stick to the thin metal liner. Final purity of residue is limited only by nonvolatile metals such as copper.
Published Version
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