TY - JOUR
T1 - Effect of ion excess on particle size and morphology during barium sulphate precipitation: an experimental study
AU - Wong, David
AU - Jaworski, Zdzislaw
AU - Nienow, Alvin
PY - 2001/2/1
Y1 - 2001/2/1
N2 - Precipitation of BaSO4 has been studied in a vessel of similar to8 l stirred by a Rushton turbine. Either BaCl2 or Na2SO4 as a limiting reactant of concentration 0.1 M was added to the tank containing the opposite component at a concentration from 0.0018 to 0.027 M, thereby giving total molar ratios from 1/15 to 1 or 1 to 15/1, respectively. The results were generally not symmetrical. Molar ratios closest to 1 with BaCl2 as the feed gave the largest d(43) (similar to 20-30 mum) whilst for Na2SO4 feed, the mean size d(43) was similar to 10-15 mum. At the ratios 1/15 (BaCl2 feed) and 15/1 (Na2SO4 feed), the mean sizes were much smaller and very similar (similar to3-5 mum). In all cases, the CoV was similar to0.4 - similar to0.5. The impact of agitation speed was generally rather small. It is suggested that varying ionic ratios might be an effective and rather simple way of achieving a degree of particle size control. (C) 2001 Elsevier Science Ltd. All rights reserved.
AB - Precipitation of BaSO4 has been studied in a vessel of similar to8 l stirred by a Rushton turbine. Either BaCl2 or Na2SO4 as a limiting reactant of concentration 0.1 M was added to the tank containing the opposite component at a concentration from 0.0018 to 0.027 M, thereby giving total molar ratios from 1/15 to 1 or 1 to 15/1, respectively. The results were generally not symmetrical. Molar ratios closest to 1 with BaCl2 as the feed gave the largest d(43) (similar to 20-30 mum) whilst for Na2SO4 feed, the mean size d(43) was similar to 10-15 mum. At the ratios 1/15 (BaCl2 feed) and 15/1 (Na2SO4 feed), the mean sizes were much smaller and very similar (similar to3-5 mum). In all cases, the CoV was similar to0.4 - similar to0.5. The impact of agitation speed was generally rather small. It is suggested that varying ionic ratios might be an effective and rather simple way of achieving a degree of particle size control. (C) 2001 Elsevier Science Ltd. All rights reserved.
KW - ion excess
KW - semi-batch
KW - precipitation
KW - barium sulphate
KW - particle size distribution
UR - http://www.scopus.com/inward/record.url?scp=0035251078&partnerID=8YFLogxK
U2 - 10.1016/S0009-2509(00)00282-7
DO - 10.1016/S0009-2509(00)00282-7
M3 - Article
SN - 1873-4405
VL - 56
SP - 727
EP - 734
JO - Chemical Engineering Science
JF - Chemical Engineering Science
ER -