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Process for recovering metals from coal liquefaction residue containing spent catalysts

  • US 8,628,735 B2
  • Filed: 03/25/2010
  • Issued: 01/14/2014
  • Est. Priority Date: 03/25/2009
  • Status: Active Grant
First Claim
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1. A method of recovering metals from a coal liquefaction residue containing a spent catalyst comprising:

  • (a) deoiling and drying the coal liquefaction residue to form an ash feed;

    (b) reducing the particle size of the ash feed;

    (c) mixing the ash feed in a weak acid solution to form a first slurry containing at least alkaline earth metal compounds;

    (d) separating the at least alkaline earth metal compounds from the first slurry to form a first filtrate and a metals bearing material;

    (e) pressure leaching metals from the metals bearing material in the presence of ammonia and air to form a pressure leach slurry containing transition metals;

    (f) precipitating and recovering transition metals from the pressure leach slurry.

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