Method for producing briquettes from pellet fines, DRI sludge, DRI fines and dust from DRI dedusting systems, for industrial use in direct-reduced iron production processes
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United States of America Patent
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Oct 27, 2020
Grant Date -
Sep 21, 2017
app pub date -
Jun 2, 2017
filing date -
Dec 3, 2014
priority date (Note) -
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Abstract
A method for producing briquettes from pellet fines, DRI sludge, DRI fines and dust from DRI dedusting systems and, in this way, reincorporating same into steel production processes, thereby contributing to the re-use of the by-products of these processes, as well as minimizing the stocks of these types of materials and, consequently, helping to improve the environment. The invention comprises: grinding and sieving the pellet fines and the DRI sludge; sieving the DRI fines; storing the dust from DRI dedusting systems; briquetting with roller presses, using liquid sodium silicate and bentonite or composite Portland cement as binders; sieving the briquettes; shredding the edges and waste of the fresh briquettes; and curing in order to improve the physical properties thereof, such as strength. Once cured, the fresh briquette can be stored or sent directly to direct-reduced iron production processes for use as part of the feedstock for reduction ovens or reactors.
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