Products for the manufacture of molds and cores used in metal casting and a method for their manufacture and recycle from crushed rock
AssigneeNoram Technology, Ltd.
InventorsRobert E. Sparks, Kenneth Hillel Peter Harris
Life of this patent
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Abstract
A system and method for producing foundry quality sand from non-conventional starting materials through the combination of oolitization and classification. Incoming particulate matter is first directed into a controlled energy attrition unit where the particles are made to collide with one another. Such collisions clean and round the particles by chipping away surface projections and coatings without crushing the particles. The particle stream is then directed through a multi-fraction classifier where it is separated into two or more useable grades of foundry sand. An air classifier is preferred for the classification stage.
Claims13
A method of preparing foundry sand from particles of a base material, comprising the steps as ordered of:
- selecting a base material including a first casting sand and a second casting sand of different specific gravities such that a median grain size of the first casting sand is at least twice a median grain size of the second casting sand;
- shaping particles of said first and second casting sands through treatment in a controlled energy impactor, said treatment causing the particles to collide with one another such that surface irregularities are chipped away to produce smoothed particles;
- and
- classifying the smoothed particles with an air classifying system to produce at least two grades of finished sand corresponding to the first and second casting sands.
A method of preparing foundry sand from particles of a base material, comprising the steps as ordered of:
- selecting a base material including a first casting sand and a second casting sand of different specific gravities such that a median grain size of the first casting sand is at least twice a median grain size of the second casting sand;
- pretreating the base material by heating thereof to a temperature of approximately 300° C. for about two minutes to embrittle any elastic binder residues;
- treating the base material with a mineral acid solution to facilitate removal of alkaline residues;
- shaping particles of said first and second casting sands through treatment in a controlled energy impactor, said treatment causing the particles to collide with one another such that surface irregularities are chipped away to produce smoothed particles;
- and
- classifying the smoothed particles with an air classifying system to produce at least two grades of finished sand corresponding to the first and second casting sands.
Dependencies are inferred from the claim text.