Process for removal of sand mold residues from cast parts

Details Process for removal of sand mold residues from cast parts Process for removal of sand mold residues from cast parts

1980-12-16

1984-04-10

Lander, Ferris H.

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

164132, C03C 2300

Patent

active

044419309

ABSTRACT:
For removing and dissolving sand mold residues from cast parts, particularly sand mold residues containing zirconium oxide and titanium oxide, there have previously been used mechanical and electrochemical processes in salt melts. However, these processes are very expensive, attack the surface of the cast pieces or fail to work with sand mold constituents which are difficult to dissolve. These disadvantages are avoided by inserting the cast parts having adhering sand mold residues into a melt of 55 to 97 weight % of alkali metal hydroxide and 3 to 45 weight % of one or more fluorides of an element of the first to third main group of the periodic system of elements and/or zinc at 400.degree. to 900.degree. C. Preferably the salt melt additionally contains a boron-oxygen and/or a boron-fluorine compound.

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