Process for neutralizing regenerated sand

Details Process for neutralizing regenerated sand Process for neutralizing regenerated sand

1992-03-24

1993-05-18

Batten, Jr., J. Reed

Metal founding

Process

Including recycling of process material

134 2, 134 3, B08B 704, B22C 500, B22C 518

Patent

active

052112152

ABSTRACT:
Sand containing clay binder after regeneration is neutralized with NH.sub.4 OH as a base or sulfuric acid or hydrofluoric acid depending on its pH-value determined after regeneration by a measuring procedure, so that it subsequently has a pH-value between 6 and 8.

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patent: 4952246 (1990-08-01), Seeley
patent: 4960162 (1990-10-01), Millager
Geremia, J. J., "New Sand from Old: Thermal Reclamation . . . " 85 AFS Transactions, pp. 123-128 (Am. Found. Soc.), 1977.
Stevenson, M., "The reclamation of sands bonded with alkaline Phenolic Resins," The British Foundryman, pp. 382-383, Oct. 1986.
VDG-Merkblatt, No. R 93 (Verein Deutscher Giessereifachleute), Nov. 1988 (in German).
Weller, Edwin, "Moglichkeiten und Grenzen . . . ".
Zeitschrift Giesserei 76, No. 10/11, May 15, 1989 (German) pp. 350-358.
Grothe, Hans, Lueger Lexikon der Technik, 1963, pp. 214-215.
Jander, G. and Wendt, H., Introduction to Inorganic Chemical Practice, p. 306 (3d Ed. 1954) (in German).

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