Precipitation of Calcium from Seawater Using CO2

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Researches on precipitation of calcium from seawater have been carried out using CO2. The effect of pH value on calcium removals from seawater was investigated. It was found that it is easier to remove calcium from seawater at a higher pH value, and the removal rate of calcium can reach 60% to 90% when the pH value is from pH 8.0 to pH 9.0. The precipitated solids were characterized using X-ray diffraction (XRD) analysis. The results show that they consist of CaCO3·H2O at pH 8.0 to pH 8.7, of CaCO3·H2O and MgCO3·3H2O at more than pH 9.0.

Info:

Periodical:

Advanced Materials Research (Volumes 233-235)

Edited by:

Zhong Cao, Lixian Sun, Xueqiang Cao, Yinghe He

Pages:

747-752

DOI:

10.4028/www.scientific.net/AMR.233-235.747

Citation:

J. J. Zhang et al., "Precipitation of Calcium from Seawater Using CO2", Advanced Materials Research, Vols. 233-235, pp. 747-752, 2011

Online since:

May 2011

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Price:

$35.00

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