Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1989-07-13
1990-04-10
Doll, John
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 25, 75 62, 75 71, 75 83, 75101R, 75109, 75113, 75118R, 423 27, 423 29, 423 34, 423 36, 423 46, 423 87, 423109, 423131, C22B 102, C22B 304, C22B 702
Patent
active
049157302
ABSTRACT:
A process and apparatus for the recovery of metals such as silver from phosphate flue dust. The process includes the steps of blending chloride salt and the flue dust to produce a blended material, roasting the blended material in an oxygen bearing atmosphere to oxidize carbon in the blended material producing a gas and to react chloride salt with the metal in the blended material producing a water soluble metallic salt, dissolving the metallic salt in water to produce a solution, filtering the solution to remove solids, and precipitating metals from the filtered solution with the precipitate ready for conventional smelting. The preferred embodiment of the apparatus includes a flue dust hopper and mill and a salt hopper and mill for feeding the dust and salt to a radiant tube dryer and a radiant tube asher for blending and roasting the materials, and a spray chamber at the outlet of the asher for separating solids and gases, where certain of the solids go into solution. The apparatus further includes a filter for removing the undissolved solids, a zinc feeder to add zinc to precipitate the dissolved silver, and a filter for removing the zinc-silver precipitate which is ready for smelting.
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Babor, Basic College Chemistry, 2nd edition, Thomas Y. Crowell Company, New York, 1953, p. 256.
Elias Allan
Rasmussen Hans W.
Cuomo Lori F.
Doll John
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