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A Trend to the Production of Calcium Hydroxide and Precipitated Calcium Carbonate with Defined Properties
Author(s) -
Lõhmus Hilja,
Räni Ahto,
Kallavus Urve,
Reiska Rein
Publication year - 2002
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.5450800514
Subject(s) - lime , calcium carbonate , suspension (topology) , calcium hydroxide , dissolution , calcite , chemical engineering , diffusion , calcium , particle size , chemistry , particle (ecology) , carbonate , mineralogy , hydroxide , inorganic chemistry , materials science , metallurgy , geology , thermodynamics , organic chemistry , mathematics , oceanography , homotopy , engineering , physics , pure mathematics
In this paper, production of precipitated calcium carbonate (PCC) with required particle size and morphological structure, along with its dependence on technological parameters and the properties of Ca(OH) 2 , is discussed. The effect of the reaction environment on the kinetics of CaO hydration and the formation of crystals in water suspension was established. A remarkable difference in the system's restoration ability after stirring was observed. The hydration process is initially controlled by a kinetic mechanism, followed by a diffusion‐controlled process. The dissolution speed of lime hydrated to suspension is eight times higher than that of lime hydrated to powder. Particles of hydrated lime appeared in various forms.