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Synergetic effect of secondary nucleation and growth on the lithium carbonate particle size in the gas-liquid reactive crystallization of LiCl-NH3·H2O-CO2

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Particuology 2020年第4期18卷 10-17页

作者： Menghua Tian Jianwei Guo Zhi Wang Jianwei Cao Xuzhong Gong Key Laboratory of Green Process and Engineering National Engineering Laboratory for Hydrometallurgical Cleaner Production TechnologyInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

In this study,the gas-liquid reactive crystallization of LiCl-NH3·H2O-CO2 was adopted to produce *** weakly alkaline nature of NH3·H2O in the absence of any recarbonation process resulted in a unimodal and easily controllable particle size distribution(PSD)of the obtained *** reaction temperature significantly influenced both the Li2CO3 particle size and *** increasing the temperature from 25 to 60℃,the volume weighted mean particle size increased from 50.5 to 100.5μm,*** Li2CO3 secondary nucleation rate and growth rate were obtained by focused beam reflectance measurements and a laser particle size analyzer,*** secondary nucleation rate of Li2CO3 reduced as a function of temperature,whereas the growth rate *** addition to improving the surface energy of the crystals to enhance the growth process,higher temperatures also reduced the supersolubility of Li2CO3,which also plays a role to decrease the secondary nucleation *** a constant temperature,supersaturation affects the Li2CO3 particle size through the synergistic effect of secondary nucleation and ***,with improved supersaturation,the mean particle size of Li2CO3 *** results provide a meaningful way to evaluate the crystallization process and to regulate the particle size.

关键词： Li2CO3 Gas-liquid reactive crystallization Particle size distribution Supersaturation secondary nucleation Growth rate

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The dual action of N_(2)on morphology regulation and mass-transfer acceleration of CO_(2)hydrate film

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Chinese Journal of Chemical Engineering 2024年第9期73卷 120-129页

作者： Jinrong Zhong Yu Tian Yifei Sun Li Wan Yan Xie Yujie Zhu Changyu Sun Guangjin Chen Yuefei Zhang School of Chemistry and Chemical Engineering Changsha University of Science and TechnologyChangsha 410114China State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China Institute of Environmental and Ecological Engineering Guangdong University of TechnologyGuangzhou 510006China

The morphology characteristics of CH_(4),CO_(2),and CO_(2)+N_(2)hydrate film forming on the suspending gas bubbles are studied using microscopic visual method at supercooling conditions from 1.0 to 3.0 *** hydrate film vertical growth rate and thickness along the planar gas-water interface are measured to study the hydrate formation kinetics and mass transfer *** N_(2)in the gas mixture plays the same role as lowering the supercooling conditions,both retarding the crystal nucleation and growth rates,which results in larger single crystal size and rough hydrate morphology.N_(2)in the gas mixture helps to delay the secondary nucleation on the hydrate film,which is beneficial to maintain the porethroat structure and enhance the mass *** vertical growth rate of hydrate film mainly depends on the supercooling conditions and gas compositions but has weak dependence on the experimental temperature and *** the same gas composition condition,the final film thickness shows a linear relationship with the supercooling *** mass transfer coefficient of CH_(4)molecules in hydrates ranges from 4.54×10^(-8)to 7.54×10^(-8)mol·cm^(-2)·s^(-1)·MPa^(-1).The maximum mass transfer coefficient for CO_(2)t N_(2)hydrate occurs at the composition of 60%CO_(2)t 40%N_(2),which is 3.98×10^(-8)mol·cm^(-2)·s^(-1)·MPa^(-1).

关键词： Gas hydrate Morphology secondary nucleation Formation kinetics Mass transfer

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Crystallization of gibbsite from synthetic chromate leaching solution in sub-molten salt process

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Transactions of Nonferrous Metals Society of China 2015年第8期25卷 2734-2743页

作者：张培育魏广叶郭强曲景奎齐涛中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室北京100190 中国科学院大学北京100049

For the clean and economical production of chromium compounds, it is crucial to remove aluminates from chromate alkali solutions and utilize aluminum-containing compounds. In this work, carbonization was used to remove aluminates from a synthetic chromate leaching solution containing a high K2O/Al2O3 mole ratio. The influence of reaction temperature, carbonization time, flow rate of carbon dioxide, and seed ratio on the precipitation of Al was investigated. The optimal output was obtained under the following experimental conditions： a reaction temperature of 50 °C, a carbonization time of 100 min, a carbon dioxide flow rate of 0.1 L/min, and a seed ratio of 1.0. Gibbsite was obtained following carbonization. The structure and morphology of the gibbsite were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and laser particle size analyzer. The particle size distribution and morphology of the gibbsite were significantly influenced by the experimental conditions. The gibbsite had a mean particle size （d50） of 16.72μm. The thermal decomposition of the gibbsite was analyzed by XRD and the decomposition path was determined. The obtained coarseα-Al2O3 precipitate, which contains 0.08% Cr2O3 and 0.10% K2O, was suitable for subsequent utilization.

关键词： gibbsite secondary nucleation carbonization chromate leaching solution

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