YAN Dongjie1, ZHAO Jiaxuan1, LI Zaoyuan2, YU Ya1
(1. College of Environmental and Municipal Engineering, Shaanxi Key Laboratory of Environmental Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; 2. Changzhi Yingchuang Environmental Technology Co., Ltd., Changzhi 046000, China)
Abstract：In the dry flue gas desulfurization process, the preparation of Ca(OH)2 powders with a high specific surface area has become increasingly valuable for flue gas purification due to the tiny specific surface area with small pore volume and pore size of ordinary Ca(OH)2, thus leading to low desulfurization officiency. Limo digestion conditions are vital elements affection the sturcture and performance of Ca(OH)2. In order to prepare Ca(OH)2 with a high specific surface area, digestion conditions such as mass ratio of water to lime, digestion time, initial temperature of deionized water, initial particle size of quicklime, and stirring speed were investigated. The quicklime digestion products were characterized using a specific surface area analyzer, laser particle size meter, X-ray diffractometer, and scanning electron microscope. The results show that Ca(OH)2 prepared in this experiment has the characteristics of high specific surface area, loose porosity, and small grain size. Moreover, different digestion conditions have different effects on properties of Ca(OH)2. The specific surface area of quicklime digestion product Ca(OH)2 is 26.990 m2/g and the specific pore volume is 0.908 cm3/g when the mass ratio of water to lime is 0.6, digestion time is 15 minutes, initial temperature of deionized water is 90 ℃, initial particle size of quicklime is greater than 75～150 μm and stirring speed is 120 r/min.
Keywords：calcium hydroxide; quicklime digestion; specific surface area; particle size distribution
Get Citation：YAN D J, ZHAO J X, LI Z Y, et al. Influence of lime digestion conditions on properties of Ca(OH)2 with high specific surface area[J]. China Powder Science and Technology, 2023, 29(4): 46-60.
DOI：10.13732/j.issn.1008-5548.2023.04.005
Received：2022-10-03,Revised：2022-11-13,Online：2023-06-06 17:40。
Funding Project：陕西省重点研发计划项目,编号:2020SF-432。
First Author：闫东杰(1981—),男,副教授,博士,硕士生导师,研究方向为颗粒污染物控制技术。 E-mail: andongjie_2000@163.com。
CLC No：X701.3; TB4
Type Code：A
Serial No：1008-5548(2023)04-0046-15
