


Mineral Concentrate Marketing - Treatment Charges & Penalties
Mar 12, 2016· Zinc ores, as sulfides, must be roasted or sintered to reduce sulfur content before reduction is possible. Zinc oxide ores are calcined to eliminate carbon dioxide and moisture before retorting. Impurities of lead, cadmium and iron must be held to low limits to reduce brittleness and to improve corrosion resistance.
