闫东杰¹, 赵佳璇¹, 李灶渊², 玉 亚¹

（1. 西安建筑科技大学 环境与市政工程学院, 陕西省环境工程重点实验室, 陕西 西安 710055;2. 长治市赢创环境科技有限公司, 山西 长治 046000）

引用格式：闫东杰, 赵佳璇, 李灶渊, 等. 石灰消化条件对高比表面积Ca(OH)₂性能的影响[J]. 中国粉体技术, 2023, 29(4): 46-60.

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

收稿日期：2022-10-03，修回日期：2022-11-13，在线出版时间：2023-06-06 17:40。

基金项目：陕西省重点研发计划项目,编号:2020SF-432。

第一作者简介：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。

摘要：在烟气干法脱硫过程中，由于普通Ca(OH)₂比表面积小，孔容和孔径小，导致脱硫效率低，因此制备高比表面积的Ca(OH)₂粉体对烟气净化具有重要意义。消化条件是影响Ca(OH)₂的结构和性能的重要因素。为了制备高比表面积的Ca(OH)₂,对水与石灰的质量比(水灰比)、消化时间、去离子水的初始温度、生石灰初始粒径、搅拌速度等消化条件进行研究，利用比表面积分析仪、激光粒度仪、 X射线衍射仪和扫描电镜对石灰消化产物进行表征。结果表明：制备的Ca(OH)₂具有高比表面积和疏松多孔及晶粒小的特点，不同的消化条件对Ca(OH)₂的性能影响均不同；当水灰比为0.6、消化时间为15 min、去离子水的初始温度为90℃、生石灰初始粒径为>75～150μm、搅拌速度为120 r/min时，石灰消化产物Ca(OH)₂的比表面积为26.990 m²/g,比孔容积为0.908 cm³/g。

关键词：氢氧化钙; 石灰消化; 比表面积; 粒度分布

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

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