4. By-products
4.1 Galvanizing ash
It is a blend of :
of zinc oxide resulting from the oxidation of zinc by the air and water contained in the flux;
flux residues (burnt salt) ;
zinc metal in more or less fine form, carried along with zinc oxide and salt burnt off during surface cleaning of the bath by scraping or skimming.
These ashes are found in the form of particles of average size < 0.75 mm.
The typical mass composition of ash is as follows:
total zinc: approx. 80-90% ;
zinc metal: highly variable, from 40 to 75% (this content depends...
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By-products
Environment
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Economic data
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Annual world zinc production is 9 Mt, of which more than 50% is devoted to steel production (growth of around 3% per year).
There are 550 continuous galvanizing lines worldwide, producing 70 Mt of coated steel.
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In Europe, automotive consumption will reach 8 Mt in 2005.
In Europe, 1.7 Mt/year...
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