Claims
- 1. A method of making cement from tailings or rock fines containing silicate or siliceous compounds comprising grinding the tailings or rock fines to a size in the range of from about −250 to about 425 mesh to produce ground pozzolan, and mixing the ground pozzolan with Type 1 normal Portland cement or Type 3 high early strength Portland cement in a ratio of at least about 0.1:1 by weight to produce a blended cement.
- 2. A method according to claim 1 wherein the ground pozzolan is mixed with the Portland cement in a ratio in the range of from about 0.1:1 to about 1.75:1.
- 3. A method according to claim 1 wherein the ground pozzolan is mixed with the Portland cement in a ratio of up to about 2.5:1 to dispose of extra tailings or rock fines without unduly reducing compressive strength.
- 4. A method according to claim 1 wherein the tailings rock fines contain from about 15% to about 95% SiO2, from about 0 to about 35% Al2O3 and from about 0 to about 35% CaO by weight.
- 5. A method according to claim 1 wherein sand, stone and water are added to the blended cement to produce concrete.
- 6. A method according to claim 1 including separating metal values from ground tailing pozzolan before mixing with the Portland cement.
RELATED APPLICATIONS
[0001] This application is a continuation in part of U.S. patent application Ser. No. 09/580,347 filed May 25, 2000 which claims priority from U.S. Provisional Patent Application No. 60/137403 filed Jun. 1, 1999.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60137403 |
Jun 1999 |
US |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09580347 |
May 2000 |
US |
Child |
09892488 |
Jun 2001 |
US |