Method for the alteration of siliceous materials from Bayer proc

Details Method for the alteration of siliceous materials from Bayer proc Method for the alteration of siliceous materials from Bayer proc

1992-08-03

1994-05-24

Hruskoci, Peter

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

210696, 423121, C01F 702

Patent

active

053146263

ABSTRACT:
Siliceous materials produced by thermally treating Bayer process liquors are obtained in modified form when produced in the presence of ammonium, aromatic amine, and amine compounds, or compounds bearing ammonium, aromatic amine or amine moieties, such as N-propylamine, pyridine and tetramethylammonium hydroxide. These modified siliceous materials possess morphologies which confer upon them a reduced tendency to deposit on surfaces throughout the process.

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patent: 4328106 (1982-05-01), Harrar et al.
patent: 4405461 (1983-09-01), Rogers
patent: 4532047 (1985-07-01), Dubin
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"Behavior of Silica in Sodium Aluminate Solutions", R. G. Breur, L. R. Barsotti, A. C. Kelly, AIME Int'l. Aluminum Symposium, NY, Feb. 18-22, 1962.
"Scaling in Bayer Plants", G. Roach, J. Cornell, CHEMECA 85, Paper B7A.
"Review on the Study of Scales Formed on Equipment During Alumina Production Process", Wang Yajun, Ke Jiajun, Institute of Chemical Metallurgy, vol. 9 No. 4, Nov., 1988 CA 110 (18): 158158g.
"Heating and Evaporation of Silicon Containing Aluminate Solutions", V. G. Kazakov, N. G. Potapov, A. E. Bobrov (USSR) CA:92 61106K.

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