生石灰湿法消化制备高比表面积氢氧化钙及结构表征

doi:10.19964/j.issn.1006-4990.2024-0110

摘要/Abstract

摘要：

高比表面积氢氧化钙可以提升其在烟气脱硫过程中的反应效率。采用工业级生石灰为原料湿法消化制备高比表面积氢氧化钙，以二甘醇（DEG）和三乙醇胺（TEA）作为复配消化助剂（DEG/TEA），考察了DEG/TEA复配质量比、DEG/TEA复配助剂添加量、消化温度、水灰比、消化时间和生石灰活性度对氢氧化钙比表面积及粒径的影响；利用比表面积分析仪、纳米粒度仪、扫描电镜、X射线衍射仪及红外光谱仪对氢氧化钙进行表征分析。结果表明，较佳的湿法消化反应条件：DEG/TEA复配质量比1∶2、DEG/TEA复配助剂添加量7.5%（质量分数）、消化温度为70 ℃、水灰质量比为4∶1、消化时间为40 min，所制备的氢氧化钙比表面积为64.44 m²/g，总孔容积为0.265 cm³/g，平均粒径为0.800 μm，其微观形貌为纳米片状层层堆叠而成的团聚体，且具有发达的狭缝孔结构。研究发现，同样消化条件下，生石灰活性度越高，所制得的氢氧化钙比表面积越大。最后，提出了高比表面积氢氧化钙可能的形成机理。

关键词: 氢氧化钙, 比表面积, 粒径, 消化反应, 生石灰

Abstract:

High specific surface area calcium hydroxide can improve its reaction efficiency in the flue gas desulfurization process.Industrial quicklime was used as raw material to prepare high specific surface area calcium hydroxide by wet digestion.Diethylene glycol（DEG） and triethanolamine（TEA） were used as compound digestion additives（DEG/TEA），and the effects of DEG/TEA compound mass ratio，DEG/TEA compound additive amount，digestion temperature，water-to-lime ratio，digestion time and quicklime activity on the specific surface area and particle size of calcium hydroxide were investigated.Calcium hydroxide was characterized and analyzed by specific surface area analyzer，nano particle analyzer，scanning electron microscope，X-ray diffraction，and infrared spectroscopy.The findings indicated that the optimized wet digestion reaction conditions were as follows：DEG/TEA compound mass ratio of 1∶2，DEG/TEA compound additive amount of 7.5%（mass fraction），digestion temperature of 70 ℃，water-to-lime ratio of 4∶1，digestion time of 40 min.The specific surface area of the prepared calcium hydroxide was 64.44 m²/g，the total pore volume was 0.265 cm³/g，and the average particle size was 0.800 μm.Its micro-morphology was agglomerates formed by layer-by-layer stacking of nano-flakes，with well-developed slit pore structure.The research results revealed that the higher the activity of quicklime，the greater the specific surface area of calcium hydroxide produced under the same digestion conditions.Finally，the possible formation mechanism for high specific surface area calcium hydroxide was proposed.

Key words: calcium hydroxide, specific surface area, particle size, digestion process, quicklime

中图分类号:

TQ132.32

王杰, 赵旭波, 汤勇, 覃玲意, 陈小鹏, 廖丹葵, 童张法, 王琳琳. 生石灰湿法消化制备高比表面积氢氧化钙及结构表征[J]. 无机盐工业, 2024, 56(12): 104-112.

WANG Jie, ZHAO Xubo, TANG Yong, QIN Lingyi, CHEN Xiaopeng, LIAO Dankui, TONG Zhangfa, WANG Linlin. Preparation and structural characterization of high specific surface area calcium hydroxide by wet digestion of quicklime[J]. Inorganic Chemicals Industry, 2024, 56(12): 104-112.

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样品	w（CaO）	w（MgO）	w（SiO₂）	w（Al₂O₃）	w（Fe₂O₃）	w（其他）
S1	98.90	0.61	0.21	0.10	0.06	0.12
S2	96.43	1.12	0.96	0.62	0.35	0.52
S3	93.36	3.02	1.71	0.79	0.41	0.71
S4	91.92	3.24	2.11	1.16	0.64	0.93

样品	原料生石灰活性度/mL	产物氢氧化钙比表面积/（m²·g^-1）
S1	408	64.44
S2	357	56.59
S3	300	45.65
S4	210	20.77

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