Foundry sand reclamation

Details Foundry sand reclamation Foundry sand reclamation

1979-04-09

1984-05-22

Lin, Kuang Y.

Metal founding

Process

Including recycling of process material

B22C 500

Patent

active

044495668

ABSTRACT:
A dry method of conditioning spent foundry sand is disclosed. After having sized the sand and removal of tramp metallic elements, the sand is subjected to a sequence of squeezing under a high-stress low kinetic energy system for a period of 5-30 minutes, and then propelled against a target with high-kenitic energy in the presence of a suction for several minutes. This sequence can be preferably repeated to increase the quality of the resulting product which should have 0.1% or less of fine particles, a pH of 6-9, a clay content and organic combustible content of substantially zero. The reclaimed sand will exhibit a density of at least 100 grams/biscuit when compacted for core making or molding.

REFERENCES:
patent: 2813318 (1957-11-01), Horth
patent: 3230635 (1966-01-01), Dietert
patent: 4144088 (1979-03-01), Adams
Report on Sand Reclamation Investigation of American Steel Foundries, vol. 30, AFA Transactions 1923, pp. 743-761.
Reclaim Ferrous Foundry Sand, Jeter, E. C., American Foundryman, Feb. 1949, pp. 40-44.
Foundry Sand Reclamation Techniques, Smith, K. J., Foundry M & T, Nov. 1976, pp. 48-52.
Sand Reclamation, Past, Present, Future, Den Breejen, A. C. , AFS Transactions, vol. 82, 1974, pp. 7-14.
Molding Methods and Materials, 5th ed., American Foundrymen's Society, 1962, pp. 211-216.

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