Claims
- 1. A method of making cement from base metal smelter slag produced by nickel, copper, lead or zinc smelter, said slag containing by weight from about 15 to 40% silica (SiO.sub.2), from about 35 to about 60% iron oxide (Fe.sub.2 O.sub.3) and from about 2 to about 20% calcium oxide (CaO), comprising:
- grinding the base metal smelter slag with clinker and blast furnace slag to a size in the range of from about -250 to about 425 mesh to produce ground slag cement, and
- mixing the ground slag cement with Portland cement in a ratio of at least about 0.5:1 by weight to produce a blended cement.
- 2. A method according to claim 1 wherein the ground slag cement is mixed with Portland cement in a ratio of from about 0.5:1 to about 1.5:1 by weight to produce the blended cement.
- 3. A method according to claim 1 wherein the ground slag cement is mixed with Portland cement in a ratio of from about 1.25:1 to about 1.75:1 by weight to produce the blended cement.
- 4. A method according to claim 1 wherein the ground slag cement is mixed with Portland cement in a ratio up to about 2.5:1 to dispose of extra slag.
- 5. A method according to claim 1 wherein sand, stone and water are added to the blended cement to produce concrete.
- 6. A method of making a binder for mine backfill from base metal smelter slag, said slag being produced by a nickel, copper, lead or zinc smelter and containing 15 to 40% silica (SiO.sub.2) from about 35 to about 60% iron oxide (Fe.sub.2 O.sub.3) and from about 2 to about 20% calcium oxide (CaO), comprising:
- grinding the base metal smelter slag with clinker and blast furnace slag to a size in the range of about -250 to about 425 mesh to produce ground slag cement, and adding from about 2% to about 60% by weight of a flocculating agent and tailings or sand to produce a binder for mine backfill.
- 7. A method according to claim 6 wherein the flocculating agent comprises calcium aluminum sulfate activated by sulfuric acid.
Parent Case Info
This application is a continuation-in-part of application Ser. No. 08/756,861 filed Nov. 26, 1996, U.S. Pat. No. 5,749,962 which is a continuation-in-part of application Ser. No. 08/494,665 filed Jun. 26, 1995, now U.S. Pat. No. 5,593,493 issued Jan. 14, 1997.
US Referenced Citations (7)
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
756861 |
Nov 1996 |
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Parent |
494665 |
Jun 1995 |
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