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Calcium carbonate precipitation in a continuous stirred tank reactor
Author(s) -
Maruscak A.,
Baker C. G. J.,
Bergougnou M. A.
Publication year - 1971
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450490619
Subject(s) - calcium carbonate , mixing (physics) , agglomerate , precipitation , economies of agglomeration , aqueous solution , chemistry , residence time (fluid dynamics) , calcium , sodium carbonate , reagent , calcium nitrate , carbonate , geometric standard deviation , mineralogy , chemical engineering , sodium , geology , organic chemistry , physics , quantum mechanics , meteorology , engineering , geotechnical engineering , aerosol
The precipitation of calcium carbonate, brought about by mixing aqueous solutions of calcium nitrate and sodium carbonate in a continuous reactor, has been studied. The pH (8.5‐10.0), reagent concentration (0.25‐1.7 N), temperature (15‐60°C), residence time (1‐3 min), and mixing speed (100‐500 rpm) were chosen so that the effects of agglomeration could be examined The presence of agglomerates was confirmed by microscopy. Precipitate size distributions were log normal, and the geometric mean diameters, ranging from 5 to 13 p.m, were extremely sensitive to pH. Large precipitates were obtained under conditions favouring a high agglomeration rate; namely high temperatures, concentrations, and mixing speeds. The effect of residence time was minimal. The geometric standard deviation increased with the mean size of the precipitate. The solids recovery decreased with increasing temperature, but was not significantly affected by the other parameters