Process for recovering metals from coal liquefaction residue containing spent catalysts
First Claim
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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Accused Products
Abstract
In one embodiment, this invention is directed to a method of recovering metals from a metals bearing material comprising: reducing the particle size of at least a portion of the metals bearing material; mixing the metals bearing material in an acid solution to form a first slurry containing at least alkaline earth metal compounds; separating the at least alkaline earth metal compounds from the first slurry to form a first filtrate and a metals bearing material; leaching metals from the metals bearing material to form a pressure leach solution containing transition metals; precipitating and recovering transition metals from the pressure leach solution. In another aspect, the invention relates to a method for recovering metals from a deoiled and dried coal liquefaction residue that contains spent catalyst originating from a Group VIB metal sulfide catalyst.
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Citations
33 Claims
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1. A method of recovering metals from a coal liquefaction residue containing a spent catalyst comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification