RECOVERY OF PURE MAGNESIUM COMPOUNDS FROM SEAWATER BY THE USE OF THE EFFECT OF ISOTHERMAL SUPERSATURATION IN THE ION-EXCHANGE PROCESS

Authors
KHAMIZOV RK MIRONOVA LI TIKHONOV NA BYCHKOV AV POEZD AD
Citation
Rk. Khamizov et al., RECOVERY OF PURE MAGNESIUM COMPOUNDS FROM SEAWATER BY THE USE OF THE EFFECT OF ISOTHERMAL SUPERSATURATION IN THE ION-EXCHANGE PROCESS, Separation science and technology, 31(1), 1996, pp. 1-20
Citations number
14
Categorie Soggetti
Engineering, Chemical","Chemistry Analytical
Journal title
Separation science and technology → ACNP
ISSN journal
01496395
Volume
31
Issue
1
Year of publication
1996
Pages
1 - 20
Database
ISI
SICI code
0149-6395(1996)31:1<1:ROPMCF>2.0.ZU;2-Y
Abstract
The effect of high supersaturation of magnesium carbonate solutions in an ion-exchange bed is displayed on treatment of (Mg2+-Na+) forms of carboxylic resins in the column with solutions of sodium carbonate and sodium bicarbonate. Upon leaving the column the supersaturated eluate decomposes with formation of coarse-grained crystals of nesquegonite: MgCO3 . 3H(2)O. The sorption scheme of isolating pure magnesium compo unds from seawater by means of the effect of isothermal supersaturatio n was advanced and tested on a pilot-plant scale. The proposed process includes stages of isolation of calcium using natural and manufacture d zeolites and isolation of magnesium using carboxylic ion-exchange re sins. The mathematical model of the dynamics of the ion-exchange proce ss with supersaturation is developed.