| US 7,531,151 B1 | ||
| Powdered metals extracted from acid mine drainage and their use in the manufacture of pressed metal articles | ||
| James R. Aiello, Ridgeway, Pa. (US) | ||
| Assigned to Saint Marys Pressed Metal, Inc., Ridgway, Pa. (US) | ||
| Filed on Mar. 03, 2006, as Appl. No. 11/368,273. | ||
| Claims priority of provisional application 60/642938, filed on Mar. 04, 2005. | ||
| Int. Cl. C02F 11/12 (2006.01); C02F 103/10 (2006.01) | ||
| U.S. Cl. 423—150.3 [75/746; 75/751] | 18 Claims |
| 1. A method for the recovery of iron-bearing powder from acid mine drainage, said method comprising the steps of:
A) obtaining a wet metal-containing precipitate that has been formed by treatment of metal-containing acid mine drainage and
separated from standing water, said wet metal-containing precipitate comprising iron and calcium as the two most prevalent
metals by weight percentage;
B) heating the wet metal-containing precipitate in an oxide reducing atmosphere at a temperature of approximately 400° F.
to approximately 2070° F. to i) dry the wet metal-containing precipitate, ii) at least partially reduce any oxides, and iii)
form a dry iron-bearing precipitate;
C) processing the dry iron-bearing precipitate to form an iron-bearing powder suitable for later sintering; and
D) combining a lubricant with said iron-bearing powder obtained in Step C.
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