Progress in Producing Detinned Steel from Urban Refuse Magnetic Fractions.
Makar-HV; Gresh-EL III
6th Miner Waste Util Symp Chicago 5/2-3/78 Spons USBoM & IIT Res Inst :196-203
Ferrous fractions recovered from urban refuse were tested by the Bureau of Mines, U.S. Department of the Interior, to assess the character, composition, and response to detinning as part of the Bureau's efforts to conserve mineral resources through recycling. Results from laboratory and pilot tests established the technical feasibility of detinning scrap recovered from household refuse. Detinned products containing less than 0.03 pct residual tin were produced. Concentrations of other residual elements were determined and compared with those in existing commercial evaluations under commercial conditions. Preliminary tests with 5-1/2 short tons of ferrous fractions revealed the need for adequate shredding to assure optimum metal-caustic contact and minimize retention of tin-bearing rinse solution in the final baled product. The washed metal product contained 0.06 pct residual tin. Subsequent melt tests showed a yield of 91.4 pct. Based on these studies, full-scale commercial demonstrations were initiated. A detinned product comparable to current commercially detinned bales is considered achievable, with concurrent recovery of up to 5 pounds of tin per gross ton of scrap.
6th Miner. Waste Util. Symp., Chicago, 5/2-3/78; Spons. USBoM & IIT Res. Inst., PP. 196-203