Over the centuries, zinc has proven to be a reliable, durable, corrosion-resistant and attractive metal for use in roofing and cladding. In this article, Marta Danylenko, marketing manager at materials search engine Matmatch explains the history, applications and benefits of using zinc in architectural applications, particularly for roofing and cladding.
The mineral zinc occurs naturally in soil, ore, air and water. In addition to being an abundant and important non-ferrous mineral, it is also essential to daily life and promotes organ and immune system development. Asia, Australia and America are the continents from which most of the world’s zinc supply is mined.
Thirty per cent of the total international zinc supply is recycled. The remaining 70 per cent is the result of extractive metallurgy. Zinc is typically extracted as a by-product of copper, lead and/or iron, most often from deposits of sulfidic ore.
After grinding ore into a fine powder, it is subjected to froth flotation and the resulting concentrate of zinc sulphide ore is roasted. Pyrometallurgy or electrowinning follows the roasting process. The amount of energy required to produce zinc from ore is around 50 per cent of that required for copper and steel, and around 25 per cent of the energy required to produce aluminium.
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