Patent ID: 7531151
Filing Date: 2009-05-12
Classification: C02F,C22B,Y02P

Abstract:
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.