Abstract
This paper reports a study of the flocculation and dispersion of suspensions of dolomite by acrylate polymers of various molecular weights. The mechanism by which dispersion of dolomite occurs is interpreted on the basis of experimental results of dispersion tests, zeta potential and polymer adsorption measurements. From these data, it is concluded that electrostatic effects must not be ignored in explaining the behaviour of mineral suspensions. In the specific case of dolomite, the electric charge interactions appear to play a fundamental role and to be mainly responsible for the dispersion effect observed with polymers of low molecular weight (± 10,000). At high pH values (between 9.5 and 11.2), dolomite slimes can be dispersed, although the coverage of the mineral surface by the polymer is limited to 25%. On the other hand, when a polymer of high molecular weight (about 1,000,000) is used, this factor reaches values above 50%.
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