Both materials were calcined at 900 °C during one hour, under controlled temperature conditions by a laboratory furnace and, ground during 120 minutes by a ball-mill with 600-liters capacity.
Ambos materiales fueron calcinados a 900 °C durante 1 hora, bajo condiciones controladas de temperatura en un horno de laboratorio, y molidos durante 120 minutos en un molino de bolas con capacidad de 600 litros.