Recovery of Chromite and Silica from Steel Industry Waste Molding Sands.
Barnard-PG; Ritchey-RA; Kenworthy-H
NTIS: PB 203 890 :21 pages
Most foundry molding sands are recycled within their plants until they become unusable through agglomeration or because of excessive coating with deleterious materials. This portion of the sand is then discarded since it no longer has the required properties. To eliminate this waste, a method was developed to clean the sand particles and recover the valuable components by using physical separation techniques. A simple scrubbing followed by an oxidation roast is used to produce a quality sand which can be reused. If the waste sands contain chromite, a magnetic separation will separate this relatively expensive component after the cleaning treatment. A large steel foundry that has recently adopted the process for recovering chromite and silica from its waste molding sand is presently recovering for reuse about 20 tons of chromite and 80 tons of silica sand per day. (Out of print.)
NTIS Accession No.
NTIS: PB 203 890