I think the benefits for the galvanzing industry are unclear from discussions to date. Hummmms, I think you may be mixing up technologies - I don't think galvanizing generates dust.
Steel is pickled in acid prior to galvanizing. The pickle liquor would be likely to contain iron, and some minor amounts of heavy metals. The amount of zinc in the liquor would be in proportion to the minor amount present in steel, or on its surface, and as this becomes concentrated by repeat cleaning operations. Treating the pickle liquor would therefore predominantly recover iron.
After cleaning and removal of acid the steel is dipped into a bath of zinc. Excess zinc drips back into the zinc bath when the galvanized steel item is lifted out. The zinc bath becomes gradually contaminated with other metals, eg iron, and residue from cleaning.
Unless the APG process can be used to extract the contaminants, eg iron, from the zinc bath, I think it's main benefit would be to regenerate the acid and remove iron. Some zinc recovery would be possible, but would be from the initial cleaning, rather than from the galvanizing bath stage.
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