Comparison of parameters of the granulation process of dust waste from sand reclamation

The results of studies of the process of pressure-free granulation of foundry dust were described, including dust generated in the mechanical reclamation of waste bentonite sand (Dust 1), dust generated in the dry mechanical reclamation of waste sand mixture containing approximately 90% of Floster S moulding sand and 10% of core sand with a resol type phenolic resin (Dust 2), and dust generated in the dry mechanical reclamation of waste furan resin-bonded sand (Dust 3). The aim of the studies was to produce granules of specified dimensions and strength parameters. Dust granules were formed from pure bentonite dust and two dust mixtures of the following compositions: mixture 1 - 75 wt. % of dust from the reclamation of various mixed foundry sands and 25 wt. % of dust from the reclamation of bentonite sand, and mixture 2 - 50 wt. % of dust from the reclamation of furan sand mixed with 50 wt. % of dust from the bentonite sand. The moistened bentonite sand dust was used as a binder in the granulation of post-reclamation dust from the technology of loose self-hardening sands. The following parameters of the final product were determined: final moisture content (W), the shattered resistance of granules (Wz) tested immediately after the granulation process and after the lapse of 1, 3, 5, 10 and 30 days of seasoning, and water resistance of granules after the immersion in water for 24 hours. Studies were conducted on granules produced in the granulator pan inclined at an angle of 45° and rotating at four different speeds of 10, 15, 20 and 25 rev/min.

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