Binder for mine tailings
AssigneeLafarge Canada Inc.
InventorsBrian O'Hearn, Terrance Ronald Walton
Life of this patent
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Abstract
A binder for mine tailings and aggregate used as a backfill for an underground void comprises ferrous slag, and cement kiln dust, optionally with lime kiln dust; the binder displays strength characteristics better than or comparable to those achieved with conventional binders based on Portland cement and slag.
Claims19
A fill material for an underground void comprising an intimate mixture of:
- A particulate composition comprising mine tailings, a particulate, hydraulically solidifiable inorganic binder composition for said particulate composition and water,
- Said binder composition comprising, in weight %, to a total of 100%, based on the weight of the binder composition:
- a) 70 to 97.5% of a ferrous slag;
- b) 2.5 to 30% of cement kiln dust, and
- c) 0 to 30% of lime kiln dust.
A fill material for backfilling a man-made underground void comprising an intimate mixture of:
- i) a particulate composition of mine tailings and inert particulate aggregate,
- ii) a particulate, hydraulically solidifiable inorganic binder composition, and
- iii) water,
- said binder composition comprising, in weight %, to a total of 100%, based on the weight of the binder composition:
- a) 70 to 97.5% of iron blast furnace slag;
- b) 2.5 to 30% of cement kiln dust;
- c) 0 to 30% of lime kiln dust, provided that when present, said lime kiln dust is present in an amount of at least 2.5%;
- said fill material having a solids content of 65 to 85%, by weight, and said binder composition and particulate composition being present in a weight ratio of 1:8to 1:50.
A particulate binder composition for a backfill material comprising, in weight %, to a total of 100%, based on the weight of the binder composition:
- a) 70 to 97.5% of a ferrous slag;
- b) 2.5 to 30% of cement kiln dust, and
- c) 0 to 30% of lime kiln dust.
Dependencies are inferred from the claim text.