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A Mobile "In-flight" Plasma Process to Treat Electric Furnace Dust.

Authors
Hepworth-MT; Tylko-JK
Source
For Reference Only At Bureau Libraries Contract No G1175132-2721 (G1175132-2721):69 pages
Link
NIOSHTIC No.
10011023
Abstract
A new type of plasma device, the sustained shockwave plasma (ssp), has been shown to treat electric arc furnace dust (efd) to produce a nonhazardous slag and to recover metallic zinc and lead for recycle. The ssp enables an in-flight treatment of efd and provides a diffuse plasma zone in which reduction reactions occur. The collection efficiency of metallic zinc and lead from the efd using a specially designed cyclone condenser was about 60 pct within the condenser itself, with an additional 10 pct of the nonferrous reaction products being collected in a downstream filter bag. A zinc or lead splash condenser should be incorporated into a commercial design since the condenser used in the small-scale (500- g/h) system used in this present study was not suitable for steady- state operation. A problem was encountered with blockage of the laboratory-scale condenser exit tube, which was solved by pulsing the condenser. Another problem was high electrical energy requirements needed for the laboratory-scale reactor to process the efd; however, treatment of efd in an industrial-scale reactor equipped with a lead splash condenser appears promising. For the small scale of operation in the tests that were conducted, heat losses and transient heating effects accounted for a major portion of the energy input; however, for full-scale operation (20 tons per day), much more favorable energy utilization is to be expected.
Publication Date
19910101
Document Type
CP; Final Contract Report;
Fiscal Year
1991
NTIS Accession No.
NTIS Price
Identifying No.
OFR 50-91
NIOSH Division
WO;
Source Name
For Reference Only At Bureau Libraries Contract No. G1175132-2721
State
NV;
Performing Organization
University of Nevada--Reno
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