A particulate material and method for manufacturing materials for cement production
OwnerNiklas TÖRNKVIST, Iva TSENOVA +1inventors
InventorsNiklas TÖRNKVIST, Iva TSENOVA, Sami LIPONKOSKI
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Abstract
A particulate material is used as an active agent for reducing chromium(VI) to chromium(III) in manufacture of cement, concrete or the like. The particulate material originates from an industrial pyrometallurgical process, preferably from a steelmaking process, and includes at least 10 weight-% of iron(II) and/or iron(III), given as Fe2O3, calculated from the dry weight of the particulate material, and preferably 5 weight-% or less, more preferably 3 weight-% or less, of Fe(0). A method is for manufacturing a particulate material which is suitable for use as an active agent for reducing chromium(VI) to chromium(III) in a manufacture of cement, concrete or the like.
Claims19
A particulate material adapted for use as an active agent for reducing chromium(VI) to chromium(III) in manufacture of cement, concrete or the like, wherein the particulate material comprises an industrial pyrometallurgical processed material, and comprises at least 10 weight-% of iron(II) and/or iron(III), given as Fe2O3, calculated from a dry weight of the particulate material.
A method for reducing chromium(VI) to chromium(III) in a manufacture of cement, concrete or the like, the method comprising:
- obtaining a particulate material originating from an industrial pyrometallurgical process, preferably from a steelmaking process, the particulate material comprising at least 10 weight-% of iron(II) and/or iron(III), given as Fe2O3, and calculated from the dry weight of the particulate material, and preferably 5 weight-% or less, more preferably 3 weight-% or less, of Fe(0), and
- adding the particulate material as an active agent to a cement mix, concrete mix or the like for reducing chromium(VI) to chromium(III).
A method for manufacturing a particulate material, adapted for use as an active agent for reducing chromium(VI) to chromium(III) in a manufacture of cement, concrete or the like, the method comprising:
- obtaining a starting particulate material originating from an industrial pyrometallurgical process, preferably from a steelmaking process, starting the particulate material comprising iron(II) and/or iron(III), and
- fractioning the starting particulate material into at least a first fraction and a second fraction, wherein the first fraction and the second fraction have different content of iron(II) and iron(III), and the second fraction is a particulate material comprising at least 10 weight-% of iron(II) and/or iron(III), given as Fe2O3 and calculated from the dry weight of the particulate material, and preferably 5 weight-% or less, more preferably 3 weight-% or less, of Fe(0).
Dependencies are inferred from the claim text.