Process for the removal of silica from an alkaline solution cont

Details Process for the removal of silica from an alkaline solution cont Process for the removal of silica from an alkaline solution cont

1998-06-19

2000-07-11

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423116, 423119, 423600, C01F 700, C01F 702, C01F 704, C01F 716, C22B 2100

Patent

active

060868341

ABSTRACT:
A process is described for removing dissolved silica from an alkaline solution containing sodium aluminate, e.g. a Bayer process solution. The process comprises contacting the alkaline solution with a slowly stirred bed of particles comprising coarse silica sand or a mixture of coarse silica sand and particles of sodalite, whereby the dissolved silica is precipitated out of solution to form a precipitation of desilication product dispersed in the solution and separating the desilication product solids from the alkaline solution to obtain a desilicated alkaline solution.

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The, "A Novel Approach to Post-Desilicating Bayer Process Liquor," Light Metals, San Diego, Mar. 1-5, 1992, No. Meeting 121, Mar. 1, 1992, pp. 117-122, XP000366141.
Murakami et al., "Aspect of Desilication Kinetics with Recycled Seed," Light Metals, San Diego, Mar. 1-5, 1992, No. Meeting 121, Mar. 1, 1992, pp. 113-116, XP00D366140.

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