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Typically, a zinc concentrate contains about 55% of zinc with some copper, lead and iron.

Zinc concentration is usually done at the mine site to keep transport costs to smelters as low as possible.

At the same time sulfur reacts with oxygen giving out sulfur dioxide which subsequently is converted to sulfuric acid – an important commercial by-product.

The Hydrometallurgical Process In a leaching stage the zinc oxide is separated from the other calcines. The zinc content dissolves whereas iron precipitates and lead and silver remain undissolved.

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Apart from zinc, the concentrate contains some 25-30% or more sulfur as well as different amounts of iron, lead and silver and other minerals.However, the dissolved solution contains some impurities which need to be eliminated in order to obtain a high-purity zinc product at the end of the production process.Purification is mainly done by adding zinc dust to the solution.Metamorphically formed oxide zinc ores such as franklinite or zincite are limited to only a few deposits.Zinc Mining 80% of zinc mines are located underground, 8% are of the open pit type, with the remainder a combination of both.The mineral marmatite is a complex zinc-iron sulfide, which is commonly found but rarely exploited, as it is not easy to smelt.