Chemistry: physical processes – Physical processes – Crystallization
Patent
1976-02-27
1977-11-01
Emery, Stephen J.
Chemistry: physical processes
Physical processes
Crystallization
23271R, 23273R, 23305A, 210 82, 210393, 423132, 423126, 23279, B01D 902, B01D 1102, C01F 722, C01F 704
Patent
active
040563634
ABSTRACT:
An apparatus for the production of pure alumina from alumina and silicate containing raw materials comprising means to feed said raw material into the top of an acid resistant leaching tower; means to continuously feed a leaching liquor containing hydrochloric acid into the bottom of said leaching tower, means to continuously flow said leaching liquor upward through said raw material to leach out the alumina as a solution of aluminum chloride, means to withdraw said solution enriched in aluminum chloride toward the top of said tower zone; means to withdraw 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 means to separate said solid residue from said carrier liquid in said separation zone.
REFERENCES:
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patent: 1519880 (1924-12-01), Specketer
patent: 1778083 (1930-10-01), Marburg
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Chem & Met's Chem Engin Flow Sheets, 4 Ed., Eli Olive, 1944, McGraw-Hill, p. 7, Coy w. Emery PU175.
Tilley et al., Acid Processes For The Extra Of Alumina, Dept of Comm. Beau of Mins, Bulletin 267, 1927/36, pp. 1-84.
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