Refluxing Process
The New Jersey Zinc Company invented this process in 1930.
The process take advantage of the relatively low boiling point of zinc (907 °C (1,665 °F)) as compared to the impurities being removed in the first "column": iron and aluminium. Therefore, in the first column the zinc is heated above its boiling point and allowed to rise to a condenser. The other impurities sink to the bottom in the form of a solid or liquid. There is still lead and cadmium, in the form of vapor, impurities. In order to remove the lead 2-3% of the vapor is condensed, which draws the majority of the lead out of the vapor; down to the point where it is only 0.003% of the total contents. Finally the vapor is pumped into the cadmium column where it is cooled to an intermediate temperature below the boiling point zinc, but still above the boiling point of cadmium (767 °C (1,413 °F)). The zinc leaves out the bottom as a refined liquid, while the cadmium leaves out the top as vapor.
Read more about this topic: Zinc Refining
Famous quotes containing the word process:
“The American, if he has a spark of national feeling, will be humiliated by the very prospect of a foreigners visit to Congressthese, for the most part, illiterate hacks whose fancy vests are spotted with gravy, and whose speeches, hypocritical, unctuous, and slovenly, are spotted also with the gravy of political patronage, these persons are a reflection on the democratic process rather than of it; they expose it in its process rather than of it; they expose it in its underwear.”
—Mary McCarthy (19121989)