MIXTURE FOR MAKING EASILY KNOCK-OUT MOULDS AND CORES Russian patent published in 2025 - IPC B22C1/14 B22C1/18 

FIELD: foundry production.

SUBSTANCE: proposed mix comprises the following components in wt. %: liquid glass – 6, refractory clay – 0.5-3, quartz sand – 89-91.5 and a process additive. As a process additive, mixture contains 1 wt. % spent coffee grounds with water content equal to 40 wt. % and 1 wt. % metallurgical dust with particle size of 5-40 mcm. Introduction of used coffee grounds and metallurgical dust into the mixture on the liquid glass binder in the specified quantity helps to reduce the residual strength of the casting moulds and cores and allows to ensure the required strength of the mixture in the wet and hardened states.

EFFECT: improved knock-out of moulds and cores from sand mixtures on liquid glass binder, used for large-size steel casting, and recycling of wastes formed after preparation of grain coffee and in the process of cleaning gases from arc steel melting furnaces.

1 cl, 1 tbl, 1 ex