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

Abstract

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

CLC Number:

TQ132.32

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.

Figures/Tables 13

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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

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Preparation and structural characterization of high specific surface area calcium hydroxide by wet digestion of quicklime

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