The best concentration method for zinc ore is froth flotation. Procedure of Zinc Extraction. The Concentration of Ore: Froth Flotation. First of all, the ores are crushed into very fine powder sized particles and are mixed with water. The mixture obtained is called Slurry. A Collector is used which will act as a surfactant and a chemical is added to the slurry.
Metallurgy of Zinc. The principal ore of zinc used for its extraction is Zinc blend . As Zinc blend is a sulphide ore, the process used for its concentration is the Froth Floatation Method. The concentrated ore is then roasted in excess air at 1200 K to obtain zinc oxide .
The reaction of the final step of extraction of zinc is. 2ZnO+C 2Zn+CO2 2 Z n O + C 2 Z n + C O 2. Since, the boiling point of Zinc is way back at 1180 K, the zinc formed immediately vaporizes and distills over leaving behind non volatile impurities such as Cadmium, Lead and Iron.
The chief Ore of zinc is zinc blende. The extraction of zinc from zinc blende involves the following steps. Concentration: The ore is crushed and then concentrated by froth floatation Process. Roasting: The concentrated ore is then roasted in the presence of excess of air at about 1 2 0 0 k: 2 Z n S + 3 O 2 Δ 2 Z n O + 2 S O 2
Zinc is extracted from its ore by calcination to remove the sulphur converting zinc to an oxide. The next step is to smelt the particular oxide with carbon where it is... Read more