process and installation for use in foundry moulds or cores hardening of the resin sand is by gas diffusion through the sand.

摘要

Method of hardening sand and resin foundry elements (I) e.g. moulds or cores comprises forming a non-explosive mixture (II) of dimethylethylamine (DMEA) (III) and CO2 (IV) by bubbling (IV) through liquid (III), and passing (II) for a short time pref 1 second through (Ie. Pref (II) contains 10-50 pref. 40% the remainder being (IV). After passing (II) through (I) air or a neutral gas is passed through (I) for several seconds.