Solubilisation of carbonates by recycling condensates during...

Details Solubilisation of carbonates by recycling condensates during... Solubilisation of carbonates by recycling condensates during...

2007-05-15

2007-05-15

Vanoy, Timothy C. (Department: 1754)

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C423S111000, C423S121000, C423S122000

Reexamination Certificate

active

10499812

ABSTRACT:
A method for the production of aluminum from bauxites containing aluminum monohydate of the diaspore or boehmite type which may contain more than 1.5% by weight of calcium carbonates. The ore is digested by producing feeding a suspension produced from milled bauxite ore and concentrated aluminate liquor to a plant with a series of autoclaves and a series of regulators supplying tubular reheaters across the autoclaves with steam. The suspension first travels across the series of autoclaves, and on exiting, the digestion of the ore is practically complete, and the suspension then travels across the series of regulators. The condensation water from the steam coming from the regulator and feeding the reheater is collected in a purge pot. Within the series of regulators, the suspension is diluted on entering a regulator with the water coming from the condensation of the steam from one or several upstream regulators.

REFERENCES:
patent: 3560148 (1971-02-01), Tamise et al.
patent: 4101629 (1978-07-01), Mercier et al.
patent: 6814873 (2004-11-01), Spitzer et al.
patent: 2001/0012498 (2001-08-01), Lamerant
patent: 1132898 (1962-07-01), None
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The English abstract of FR 2,328,660 A published on Jun. 24, 1977.
The English abstract of FR 2,758,544 A1 published on Jul. 24, 1998.

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