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CALCIUM CARBONATE DISSOLUTION RATE IN LIMESTONE CONTRACTORS
Citation:
Letterman, R. CALCIUM CARBONATE DISSOLUTION RATE IN LIMESTONE CONTRACTORS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-95/068 (NTIS PB95222733), 1995.
Description:
The rate of carbonate mineral dissolution from limestone was studied using a rotating disk apparatus and samples of limestone of varied composition. he purpose of this study was to determine the effect of limestone composition on the kinetics of carbonate mineral dissolution. he results are needed to improve the relationships used to design limestone contactors for long term operation. he stone samples with the highest calcite content and lowest dolomite content had the highest initial rates of dissolution. he magnitude of the overall dissolution rate constant for fresh stone decreased by approximately 60% as the calcite content of the stone decreased from 0.92 to 0.09 g CaCo3/g stone. he overall dissolution rate constant decreased as the amount of calcium dissolved from the surface of the stone increased. nalysis of several stone surfaces indicated that a residue layer of aluminum, silicon and iron formed as calcium dissolved.
