Process for separating silicon compounds contained in a hydrochl

Details Process for separating silicon compounds contained in a hydrochl Process for separating silicon compounds contained in a hydrochl

1991-12-06

1993-10-05

Brunsman, David

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Iron group metal

4231503, 423324, 423DIG1, C02F 900, C02F 160, C02F 164

Patent

active

052502759

ABSTRACT:
This process in which the used bath is recycled after concentration at (1) by elimination of water at (2), followed by a treatment for recovering iron oxides at (10), is characterized in that it comprises carrying out a tangential microfiltration at (5) of the concentrated bath so as to separate therefrom the silicon compounds in the non-ionic form and thereby concentrate them, and recirculating the major part of the fraction of this bath (11-17) containing these concentrated silicon compounds so as to promote the precipitation of the non-ionic compounds of the silicon.

REFERENCES:
patent: 3310435 (1967-03-01), Robinson et al.
patent: 3442608 (1969-05-01), Addinall et al.
patent: 4086321 (1978-04-01), Holley et al.
patent: 5032369 (1991-07-01), Kondo et al.
Patent Abstracts of Japan, vol. 8, No. 178 (C238) [1605], Aug. 16, 1984, & JP-A-59 073 439, Apr. 25, 1984, T. Yasutaka, "Production of Iron Oxide From Waste Hydrochloric Acidliquor for Pickling".

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