C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/240
C01F 7/22 (2006.01)
Patent
CA 1066872
METHOD AND APPARATUS FOR THE FABRICATION OF PURE ALUMINA FROM Al2O3 AND SILICA CONTAINING RAW MATERIALS BY LEACHING WITH HYDROCHLORIC ACID Abstract of the Disclosure A process for the production of pure alumina from alumina and silicate containing raw materials comprising feeding said raw material into the top of an acid resistant leaching tower; continuously feeding a leaching liquor containing hydrochloric acid into the bottom of said leaching tower, continuously flowing said leaching liquor upward through said raw material to leach out the alumina as a solution of aluminum chloride, withdrawing said solution enriched in aluminum chloride toward the top of said tower zone; withdrawing said raw material solid residue from the bottom of said tower zone to convey said solid residue from said leaching tower into a separation zone at a level higher than the level of said leaching tower; and separating said solid residue from said carrier liquid in said separation zone. Apparatus for producing alumina according to this method includes the corresponding means.
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