Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1992-10-08
1993-09-14
Niebling, John
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
2041824, 204149, 423488, C25B 1508, C25C 106
Patent
active
052445518
ABSTRACT:
A waste pickle which has been formed in the surface treatment of rolled stock consisting of steel and contains metal salts and acids and specifically contains nitric and hydrofluoric acids and nickel salts, chromium salts, and iron salts is subjected to an acid dialysis and a membrane electrolysis. To permit a recycling of free acids at a high rate and a recovering of the metals in a form in which they can directly be used in the melting process, the acid dialysis performed for a recovery of the free nitric acid and hydrofluoric acids is succeeded by a membrane electrolysis, in which the metals are recovered from the depleted effluent from the acid dialysis, which effluent has been depleted of free acid, and the enriched effluent from the acid dialysis, which enriched effluent has been enriched with free acids, and the effluent from the membrane electrolysis, which effluent has been depleted of metals, are subjected to an evaporation.
REFERENCES:
patent: 4609443 (1986-09-01), Nogueira
patent: 4943360 (1990-07-01), Sugisawa et al.
Acid Purification Unit (APU) Brochure.
Hatch et al., "Acid Retardation," I&EC Process design and development (1963) pp. 253-263.
Munns, "Iron removal from pickle liquors using absorption resin technology," pp. 537-548.
Y. Kobuchi et al., "Application of Ion Exchange Membranes to the Recovery of Acids by Diffusion Dialysis," (1986) pp. 173-179.
C. Horner et al., "Electrolytic Treatment of Waste Sulfate Pickle Liquor Using Anion Exchange Membranes," (1955) pp. 1121-1129.
Brucken Volker
Kaune Albert
Potzschke Manfred
Wallis Ernst
Metallgesellschaft Aktiengesellschaft
Niebling John
Phasge Arun S,.
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