Importance

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Abstract

Method and apparatus for the preparation, more particularly for the coolingnd mixing of moulding sand. The method includes the steps of cooling used sand, cleaning the sand where appropriate, and mixing and homogenizing the sand by the addition of water accompanied by intensive agitation, and partly covering the particle surface of the sand with a binding agent under vacuum. The structure for performing the method includes at least one cooling station and one mixing station wherein mixing is associated with a vessel for receiving and with apparatus for supplying constituents to be mixed, and with an agitating device, a device for supplying water, and a device for removing the finished sand mixture, which structure is characterized in that the vessel can be hermetically sealed or is disposed in a hermetically sealed casing and that a vacuum chamber is provided with apparatus for generating a vacuum and at least one flow connection that can be controlled by a controllable valve device is provided between the vessel and vacuum chamber.

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First Claim