Influencing factors of induced crystallization kinetics of calcium carbonate
HU Rui-zhu1,2, HUANG Ting-lin1,2, LIU Ze-nan1,2
1. School of Environment and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; 2. Shaanxi Key Laboratory of Environmental Engineering, Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an 710055, China
Abstract：The induced crystallization rate of calcium carbonate is affected by various factors in water. The effects of the pH, supersaturation, calcium and magnesium ions activity, and metal ions, such as iron and manganese ions, on the induced crystallization rate of calcium carbonate were studied using the pH-stat method. The results showed that when the pH and supersaturation ranged from 8.0~10.0 and 1.4~4.03, respectively, the induced crystallization rate of calcium carbonate increased with the pH or supersaturation. When the activity of the calcium and magnesium ions was between 0~1.18, the induced crystallization rate of calcium carbonate decreased as the magnesium ions increased. The crystallization rate of calcium carbonate was between 1.0×10-10~5.0×10-10m/s. The presence of iron and manganese ions can increase the induced crystallization process of calcium carbonate. In the presence of iron and manganese, the crystallization rate of calcium carbonate was higher than when only iron and manganese were present. Various factors affecting the induced crystallization kinetics of calcium carbonate were studied to provide data support for the crystallization and granulation process.
Chen Y, Fan R, An D, et al. Water softening by induced crystallization in fluidized bed[J]. Journal of Environmental Sciences, 2016,28(12):109-116.
[2]
Hofman J, Hoek J P V D. Twenty years of experience with water softening in The Netherlands:water quality, environmental benefits, and costs[J]. Water, 2010,21(FEB):21-24.
[3]
Ruizhu H, Tinglin H, Aofan Z, et al. Full-scale experimental study of groundwater softening in a circulating pellet fluidized reactor[J]. International Journal of Environmental Research and Public Health. 2018,15(8):1592.
[4]
Chen Y H, Yeh H H, Tsai M C, et al. The Application of fluidized bed crystallization in drinking water softening[J]. Journal of the Chinese institute of Envrironment Engineering, 2000,10(3):177-184.
[5]
Kitamura M. Crystallization and transformation mechanism of calcium carbonate polymorphs and the effect of magnesium ion[J]. Journal of Colloid and Interface Science, 2001,236(2):318-327.
[6]
Gebrehiwet T A, Redden G D, Fujita Y, et al. The Effect of the CO32- to Ca2+ ion activity ratio on calcite precipitation kinetics and Sr2+ partitioning[J]. Geochemical Transactions, 2012,13(1):1-11.
[7]
Park W K, Ko S J, Lee S W, et al. Effects of magnesium chloride and organic additives on the synthesis of aragonite precipitated calcium carbonate[J]. Journal of Crystal Growth, 2008,310(10):2593-2601.
[8]
Beck R, Seiersten M, Andreassen J P. The constant composition method for crystallization of calcium carbonate at constant supersaturation[J]. Journal of Crystal Growth, 2013,380(1):187-196.
[9]
Lin Y P, Singer P C. Effects of seed material and solution composition on calcite precipitation[J]. Geochimica Et Cosmochimica Acta, 2005,69(18):4495-4504.
[10]
Vavouraki A I, Putnis C V, Putnis A, et al. An atomic force microscopy study of the growth of calcite in the presence of sodium sulfate[J]. Chemical Geology, 2008,253(34):243-251.
[11]
Tai C Y, Hon M J, Chen P-C. A comparison of growth behavior between CaCO3 and CaF2 crystals in a constant-composition environment[J]. Journal of the Taiwan Institute of Chemical Engineers, 2011,42(3):435-440.
[12]
Rruiz-agudo E, Putnis C V, Rodriguez-navarro C, et al. Effect of pH值on calcite growth at constant aCa2+/aCO32-ratio and supersaturation[J]. Geochimica Et Cosmochimica Acta, 2011,75(1):284-296.
[13]
Clifford Y, Juang-Horng L, Jyh-kau W. Crystal grwoth rate of calcite in a constant-composition environment[J]. Journal of the Chinese Institute of Chemical Engineers, 2005,36(5):443-450.
[14]
Hu R Z, Huang T L, Wen G, et al. Pilot study on the softening rules and regulation of water at various hardness levels within a chemical crystallization circulating pellet fluidized bed system[J]. Journal of Water Process Engineering, 2021,(41):102000.
[15]
Tai C Y. Crystal growth kinetics of two-step growth process in liquid fluidized-bed crystallizers[J]. Journal of Crystal Growth, 1999,206(1/2):109-118.
[16]
Aldaco R, Garea A, Irabien A. Calcium fluoride recovery from fluoride wastewater in a fluidized bed reactor[J]. Water Research, 2007,41(4):810-818.
[17]
Nielsen A E A J M T. Electrolyte crystal growth kinetics[J]. Journal of Crystal Growth, 1984,67(2):278-288.
[18]
Clifford Y, Tai P C, Chen S M, et al. Size-dependent growth and contact nucleation of calcite crystals[J]. AIChE Journal, 1993,39:1472.
[19]
Victoria, Boyd, Hongkyu, et al. Influence of Mg2+ on CaCO3 precipitation during subsurface reactive transport in a homogeneous silicon-etched pore network[J]. Geochimica et Cosmochimica Acta, 2014,135(7):321-335.
[20]
Zhang Y, Dawe R A. Influence of Mg2+ on the kinetics of calcite precipitation and calcite crystal morphology[J]. Chemical Geology, 2000,163(1):129-138.
[21]
Dromgoole E L, Walter L M. Iron and manganese incorporation into calcite:Effects of growth kinetics, temperature and solution chemistry[J]. Chemical Geology, 1990,81(4):311-336.
[22]
Di Lorenzo F, Burgos-cara A, Rruiz-agudo E, et al. Effect of ferrous iron on the nucleation and growth of CaCO3 in slightly basic aqueous solutions[J]. CrystEngComm, 2017,19(3):447-460.
