METHOD FOR ACID DECOMPOSITION OF CALCIUM SILICATE AND RECOVERY OF ZIRCONIUM Russian patent published in 2005 - IPC

Abstract RU 2244035 C1

FIELD: nonferrous metallurgy.

SUBSTANCE: invention aims at recovering uncommon metals from silicate ores and concentrates in processing of zirconium concentrates. Method according to invention envisages treating cake obtained by caking zircon concentrate with calcium oxide in presence of nitric or sulfuric acid. Concentrated acid is added to water-slurried cake at constant speed during 30-60 min in two steps so that 18-25% of acid is added during first 30 min, whereupon zirconium is leached at 80-90^оС.

EFFECT: increased filtration velocity and simplified process due to reduced number of operations.

2 cl, 2 dwg, 4 ex

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RU 2 244 035 C1

Authors

Sinegribov V.A.

Judina T.B.

Dates

2005-01-10—Published

2003-04-22—Filed