ISSN 2594-5297
50º Seminário de Laminação — vol. 50, num.50 (2013)
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Abstract
With ever increasing environmental legislations, shortages of raw material supply and high metal prices, the implementation of dedicated processes for treating metallurgical residues and recovering their valuable contents becomes more and more relevant. Oily mill sludge and scales are part of these residues. Their internal recycling in Sinter Plants, BF’s or BOF’s are more and more restricted due to off-gas emissions, increasing risk of ESP explosion, abrasion issues, and their impact on steel quality. Paul Wurth, an Engineering and Technology supplier for the Iron and Steel industry, and Lhoist, a leading producer of calcium oxide and magnesium oxide based chemicals, developed an innovative auto-thermal process PLD (Paul Wurth Lhoist De-oiling), which is based on a low temperature pyro-metallurgical approach by using lime, thus providing an efficient and economical solution to steelmakers. In this process, a combination of exothermal chemical reactions and a controlled oxidation process destroys the hydrocarbons contained in the oily sludge and the recovery of the premium iron ore is ready to be re-used in the Sinter Plant. Thanks to an appropriate off-gas cleaning system, exhaust gases are treated so as to limit gas emissions in terms of VOC, CO, PCB, PAH, SO2, PCDDs, PCDFs, etc...This paper will describe the PLD process efficiency by presenting results of semi- industrial tests and economic benefits
With ever increasing environmental legislations, shortages of raw material supply and high metal prices, the implementation of dedicated processes for treating metallurgical residues and recovering their valuable contents becomes more and more relevant. Oily mill sludge and scales are part of these residues. Their internal recycling in Sinter Plants, BF’s or BOF’s are more and more restricted due to off-gas emissions, increasing risk of ESP explosion, abrasion issues, and their impact on steel quality. Paul Wurth, an Engineering and Technology supplier for the Iron and Steel industry, and Lhoist, a leading producer of calcium oxide and magnesium oxide based chemicals, developed an innovative auto-thermal process PLD (Paul Wurth Lhoist De-oiling), which is based on a low temperature pyro-metallurgical approach by using lime, thus providing an efficient and economical solution to steelmakers. In this process, a combination of exothermal chemical reactions and a controlled oxidation process destroys the hydrocarbons contained in the oily sludge and the recovery of the premium iron ore is ready to be re-used in the Sinter Plant. Thanks to an appropriate off-gas cleaning system, exhaust gases are treated so as to limit gas emissions in terms of VOC, CO, PCB, PAH, SO2, PCDDs, PCDFs, etc...This paper will describe the PLD process efficiency by presenting results of semi- industrial tests and economic benefits
Keywords
De-oiling; Oil; Sludge; Scales; Hydrocarbons; Auto-thermal.
De-oiling; Oil; Sludge; Scales; Hydrocarbons; Auto-thermal.
How to refer
David, Rodriguez;
Marc, Pelletier;
Michel, Houbart.
DE-OILING OF OILY MILL SLUDGE AND SCALES
,
p. 1270-1278.
In: 50º Seminário de Laminação,
São Paulo,
2013.
ISSN: 2594-5297
, DOI 10.5151/2594-5297-24164
