Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1990-10-05
1992-04-21
Niebling, John
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204116, 423109, C25C 116
Patent
active
051064677
ABSTRACT:
Caustic dezincing galvanized steel scrap. A dezincing plant includes a plurality of tanks interconnected in series with steel scrap sequentially being moved through each of the tanks. The tanks contain a caustic leaching solution including an oxidant with the leaching solution being circulated through each of the tanks in a direction opposite to the movement of the scrap. Fresh scrap initially is exposed to a partially depleted leaching solution with the oxidant concentration of the leaching solution increasing as the scrap moves through the series of tanks. Leaching solution depleted of its oxidant is transferred to an electrolytic cell where zinc is removed and plated as metallic zinc powder onto a cathode. The leaching solution is recycled by removing zinc. The chemistry of the leaching solution is controlled so that sufficient free caustic is present to prevent passivating zinc coating on the scrap. Oxidant is added to the recycled solution and the caustic concentration is adjusted, if necessary, to have a total caustic concentration of at least 5 M and the recycled solution is returned to the last tank. Compressed scrap bales are dezinced and ready for use as a melting furnace charge material.
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Leeker Jerald W.
Neidringhaus Joyce C.
Rodabaugh Ronald D.
Armco Steel Company, L.P.
Bunyard R. J.
Fillnow L. A.
Johnson R. H.
Niebling John
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