Property stability of ultrafine calcium hydroxide suspension prepared by wet digestion: Effect of concentration
1
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
2
Hunan Key Laboratory of Mineral Materials and Application, Central South University, Changsha 410083, China.
3
School of Materials and Environment, Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, Guangxi Minzu University, Nanning 530105, China.
4
School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou 510006, China.
5
College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, 410081, China.
Publication date: 2026-05-07
Corresponding author
Kun Liu
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
Physicochem. Probl. Miner. Process. 2026;62(3):221504
KEYWORDS
ultrafine calcium hydroxide suspensionproperty stabilityparticle size and morphologysedimentation and rheological properties
TOPICS
ABSTRACT
Only the performance-stable ultrafine calcium hydroxide (Ca(OH)2) suspension has industrial practical value. This study investigated the variations in particle size, morphology, crystalline phase, sedimentation, and rheological properties of three-concentration ultrafine Ca(OH)2 suspensions (prepared via wet digestion) during 120 h of static settling. The results indicated that the three concentrations of ultrafine Ca(OH)2 suspensions exhibited consistent patterns of change in particle size, morphology, crystalline phase, sedimentation, and rheological properties during the settling process. Firstly, particle size and morphology of Ca(OH)2 only changed slightly at the initial settling stage and resumed their original states with prolonged settling. Secondly, in terms of the composition of the crystalline phase and the rheological properties, it can be observed that there is no significant change during the 120 h static settling process. Finally, regarding settling characteristics, it was found that the position of the settling interface of the ultrafine Ca(OH)2 suspension was influenced by its concentration, with the settling interface of the 18.87 wt.% suspension dropping by only 8% and that of the 9.44 wt.% suspension dropping by 48%. In conclusion, the ultrafine Ca(OH)2 suspension prepared by lime wet digestion showed excellent property stability and thus possesses considerable potential for industrial applications.
| eISSN: | 2084-4735 |
| ISSN: | 1643-1049 |
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