C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/5
C22B 7/02 (2006.01)
Patent
CA 1036361
ABSTRACT OF THE DISCLOSURE Highly crush-resistant hardened agglomerates are produced from steel plant waste dusts by forming a moistened mixture including (a) one or more of such dusts, (b) about 2 to about 20 weight percent of a bonding agent, such as lime or calcium hydroxide, and (c) about 0.5 to about 5 weight percent of a siliceous material, such as silica; aging the moistened mixture at an elevated temperature for a suf- ficient time to hydrate the overburned lime and/or slag con- tained therein; forming the aged mixture in discrete, green agglomerates; adjusting the moisture content of the green agglomerates to about 5 weight percent or less; and then hydro- thermally hardening the green agglomerates to a hardened form, The crushing or compressive strength of the hardened agglomerates can be further increased by subjecting them to a drying step to remove at least a portion of the moisture contained therein immediately after the hydrothermal hardening step.
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