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Experimental investigations were undertaken in batch kinetic systems, for the removal of iron (II) from aque- ous solutions using activated dolomite. The effect of the extent dolomite activation on the dissolution of magnesium and calcium from the dolomite lattice was determined. Under optimum experimental conditions there was a direct linear rela- tionship between magnesium dissolution and iron (II) removal from bulk solution. The experimental data were mathe- matically described using empirical external mass transfer and pseudo-intra-particle diffusion models. The data show con- formity with a three stage process, with the iron (II) removal rate showing good correlation with external mass transfer (t 90mins). The structure of the Dolomite Group is taken from the Calcite Group structure. The Calcite Group structure is lay- ered with alternating carbonate layers and metal ion layers. The structure of the Dolomite Group minerals is layered in such a way that the A metal ions occupy one layer which is followed by a carbonate layer which is followed by the B metal ion layer followed by another carbonate (CO3) layer, etc. The layering looks like this: |A|CO3|B|CO3|A|CO3|B| CO3|A|... This ordered layering of different or nonequivalent ions causes a loss of the two fold rotational axes and mirror planes that are present in the Calcite Group structure (1). The amount of calcium and magnesium in most speci- mens is equal, but occasionally one element may have a slightly greater presence than the other. Small amounts of iron and manganese are sometimes also present.

Kinetics of Iron (II) Removal from Aqueous Solution Using Activated Dolomite