化工学报2026，Vol.77Issue(2)：968-984,17.DOI:10.11949/0438-1157.20250593
电厂脱硫石膏与烟气协同合成多形貌微纳米碳酸钙工艺参数研究
Process parameters in the cooperative synthesis of polymorphic micro/nano calcium carbonate from power plant desulfurization gypsum and flue gas
摘要
Abstract
In view of the dependence of traditional CO2 mineralization technology on high-purity CO2 and crystal form control agents,this study achieved the directed synthesis of high-purity micro-and nano-calcite and vaterite-type calcium carbonate(CaCO3)using desulfurization gypsum as the calcium source and simulated flue gas as the carbon source via a bubbling carbonization device.In the NaCl and NH4 Cl systems,an isocline projection model of process parameters and particle size/yield was established through orthogonal experiments,and the synergistic regulation laws of temperature,flue gas flow rate,pH,carbonization time,and ultrasonic power on the crystal form,particle size,and yield of CaCO3 were analyzed.The results showed that in the NaCl system,calcite was the dominant crystal form,and the optimal conditions were a temperature of 40℃,a flue gas flow rate of 0.2 L/min,a pH of 7.5,a reaction time of 30 min,and an ultrasonic power of 300 W,resulting in an average particle size of 473 nm and a purity of 90%for CaCO3.In the NH4 Cl system,aragonite was the dominant crystal form,and under conditions of a temperature of 15℃,a flue gas flow rate of 0.4 L/min,an ammonia water addition of 16%,a reaction time of 120 min,and an ultrasonic power of 400 W,the purity of aragonite could reach 92.6%,with a particle size of approximately 1.3 μm.In the NaCl system,the particle size of CaCO3 was most sensitive to temperature and flue gas flow rate,while the yield was mainly controlled by carbonization time and temperature.In the NH4 Cl system,the particle size of aragonite crystals was jointly affected by ultrasonic power and temperature,and the yield was mainly controlled by flue gas flow rate and reaction time.Due to the slow adjustment of solution pH by NH+4 and OH-,the CO2 absorption rate and the nucleation rate of Ca2+were relatively low,keeping the system in a relatively mild supersaturated state,which easily induced the rapid formation of a large number of small nuclei and promoted the spherical self-assembly structure of aragonite.In contrast,in the NaCl system,the alkalinity rapidly increased after CO2 absorption,resulting in a smaller number of nuclei and primarily expansion-based crystal growth,ultimately forming large,regular calcite particles.This study revealed the multi-parameter crystal form regulation mechanism of CaCO3 synthesis through the synergistic mineralization of desulfurized gypsum and flue gas,without the need for crystal form control agents,and directly utilizing unfiltered and uncollected flue gas CO2,providing an innovative solution for the low-cost resource utilization of power plant waste.关键词
CO2捕集/废物处理/可持续性/电厂烟气/碳酸钙晶型/氯盐体系Key words
CO2 capture/waste treatment/sustainability/power plant flue gas/calcium carbonate crystal/chloride salt system分类
通用工业技术引用本文复制引用
吕灿,汪露飞,赵伟仲,王志远,苏现波,李明栩..电厂脱硫石膏与烟气协同合成多形貌微纳米碳酸钙工艺参数研究[J].化工学报,2026,77(2):968-984,17.基金项目
国家自然科学基金项目(42230804) （42230804）
