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A Water Elutriator System for Recovering Non-magnetic Metals from Automobile Shredder Rejects.

Steele DK; Sterner JW
MISSING :22 pages
An 18-in-diam column water elutriator was designed, tested, and operated by the Bureau of Mines for recovering nonferrous mixed metals from automobile shredder rejects. The unit was constructed and integrated into a local automobile shredding operation. Nonmagnetic rejects from the automobile shredder were fed onto the surface of a column of rising water. Dense materials fell through the rising water and were collected at the bottom of the column; medium-density materials were removed through a discharge port located between the overflow and sink; and light materials were immediately carried out in the overflowing water at the top of the column. Nearly 99 pct of the mixed metals were recovered from the nonmagnetic rejects as a 70-pct-metal concentrate. Other operating conditions yielded a 93.7-Pct-pure-metal product resulting in a 93.1- pct metal recovery. Float rejects are combustibles, light plastics, foam rubber, and minimal amounts of coated and uncoated copper wire. The middling discharge contained mainly medium-density rubber, plastics, glass, rock, wire, and some thin-sheet stainless steel and wrought aluminum. Records maintained by the shredder operator show a 34-pct increase in nonmagnetic metals recovery during a 1-yr operation of the water elutriator as compared to recoveries from a previously used air classification system. This work was done under an agreement between the Bureau of Mines and Learner-Pepper Company, Salt Lake City, Utah.
Publication Date
Document Type
IH; Report of Investigations
Fiscal Year
Identifying No.
RI 8771
NIOSH Division
Source Name
Page last reviewed: November 12, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division