Article
Chemistry, Multidisciplinary
Ariel Yi Hui Chua, Gian Yion Tan, Eunice Wan Qi Yeap, David Millar Walker, Joel M. Hawkins, Saif A. Khan
Summary: In this paper, a well-based microfluidic flow cell platform is presented for rapid and direct measurements of evolving crystal sizes and size-dependent growth rates. The platform allows extraction of time-varying crystal size distributions and estimation of shear and size-dependent growth rates. It can be used as a process development and analytics tool, and can be retrofitted to crystallization vessels for online measurements.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Engineering, Environmental
Pengfei Geng, Xiaoping Chen, Suyang Pan, Haifeng Zan, Jiliang Ma, Daoyin Liu, Cai Liang
Summary: Particle growth kinetics during the pyrohydrolysis of pickling waste liquor in a fluidized bed were investigated in this study. The particle growth mechanism was found to be highly dependent on the bed temperature, varying from direct droplet deposition, to droplet deposition and powder collision adhesion, and finally to powder adhesion by inertia collision. Liquid-solid interactions were responsible for the change in particle growth mechanisms. Operating parameters such as bed temperature, Fe3+ concentration, atomized gas velocity, and liquid flow rate also influenced the particle growth and granulation characteristics.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Krunoslav Zizek, Martin Gojun, Ivana Grcic
Summary: This study focuses on simulating the net granulation process of TiO2 powder using population balance modeling and coalescence models, successfully predicting particle size distributions and quantifying coalescence rates. The research reveals a meso-scale study of the wet granulation process for previously ungranulated powder systems.
Article
Chemistry, Multidisciplinary
Wei-Lee Wu, Madeline M. Mills, Ulrich Schacht, Charlie Rabinowitz, Vaso Vlachos, Zoltan K. Nagy
Summary: Traditionally, off-line measurements are used to analyze crystal products. However, frequent invasive sampling can disturb the process dynamics. To overcome this, a calibration method was performed to develop an in situ image analysis algorithm for quantifying crystal size distribution. The algorithm was optimized and adapted to different solid loadings.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Energy & Fuels
Jiaying Wang, Zeneng Sun, Yuanyuan Shao, Jesse Zhu
Summary: Circulating fluidized bed combustors are commonly used gas-solid convertors globally. Different operating regimes have been suggested by researchers, but there is still no universally accepted conclusion. Analysis of reported data supports the operation of the bottom part in the bubbling regime and the upper part as an entrained bed in commercial boilers.
Article
Energy & Fuels
Wenxin Zhao, Fangqin Cheng, Yuanyuan Zhang, Peizhen Zhao, Fengling Yang
Summary: This study investigated the evolution mechanism of limestone particles with a wide size distribution in a self-built fluidized bed. The results showed that the particle size distribution of limestone exhibited three stages as a function of reaction time. The effects of attrition, heat stress, calcination, and sulfation on the changes in particle size were quantified and correlated with time. A novel method was proposed to predict the evolution mechanism of limestone with a wide size distribution.
Article
Energy & Fuels
Vivek Ravisankar, Jie Wu, Suresh Bhargava, Rajarathinam Parthasarathy
Summary: Over-processing particles during mixing can lead to particle damage and reduced product quality in the mineral and chemical processing industries. This study investigated particle attrition in a mechanically agitated vessel using focused beam reflectance measurement (FBRM). It was found that increasing solids concentration resulted in increased particle count due to higher levels of attrition. However, under unbaffled conditions, certain impellers showed lower particle attrition, suggesting potential for process intensification.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Engineering, Chemical
Cong Wang, Daoyin Liu, Jiliang Ma, Cai Liang, Xiaoping Chen
Summary: Particle coating in fluidized beds is a widely used technique. In this study, the growth mechanisms of the coating shell on porous Al2O3 particles were investigated, including the effects of drying conditions and solution viscosities. The study revealed that the growth of the coating shell can be classified into three modes: layer growth, island growth, and irregular growth, with smaller droplet viscosity promoting layer growth.
Article
Engineering, Environmental
Van-Giang Le, Dai-Viet N. Vo, Nhat-Huy Nguyen, Yu-Jen Shih, Chi-Thanh Vu, Chih-Hsiang Liao, Yao-Hui Huang
Summary: This study successfully recovered and reused nitrogen and phosphorus from swine wastewater using fluidized-bed homogeneous granulation technology, achieving high recovery efficiency and purity. Under certain conditions, the optimal up-flow velocity and magnesium concentration significantly affect the recovery efficiency and crystal size.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Construction & Building Technology
Jing Xu, Shaobo Yang, Qiangqiang Ren, Guiyun Yang
Summary: This study investigates the granulation process of cement raw meal, confirming that the main driving force for granulation is sintering rather than solid-phase reactions. The process of granulating cement raw meal is described as a two-step process involving agglomeration and sintering.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Polymer Science
Donghyeon Lee, Byoungseung Yoo
Summary: Xanthan gum powder was agglomerated using a fluidized-bed agglomeration process with water and maltodextrin binder solution. The particle size gradually increased during agglomeration, and using maltodextrin as a binder resulted in larger particles. The rheological properties of the final product depended on the binder solution used. The native xanthan gum powder had small and dense particles, while the agglomerates had larger and porous particles with rough surfaces.
Article
Engineering, Environmental
Jacklyn Monserate Baldovia-lim, Mark Daniel G. de Luna, Ralf Ruffel M. Abarca, Carl Francis Z. Lacson, Nurak Grisdanurak, Ming-chun Lu
Summary: Anthropogenic activities and industrial processes release large amounts of nickel into the environment, leading to potential risks to public and ecological health. A method called fluidized-bed non-seeded granulation process has been found effective in removing and recovering metals, including nickel. This study focused on precipitating nickel using phosphate and investigated the effects of bi-pH operation, molar ratio, initial nickel concentration, and co-existing chemical compounds. The results showed that bi-pH operation improved the granulation process by generating heterogeneous granulation, while co-existing compounds reduced granulation efficiency due to nickel complexation, ionic competition, and precipitate dissolution.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Chao Li, He Kang, Ai Wang, Boai Zhang, Yijun Cao
Summary: Fluidized-bed flotation is a novel process that combines flotation and density separation. It has been increasingly used in grinding circuits to reject coarse gangues for sulfide ores. However, there is a lack of research on the simultaneous effects of mineral liberation, particle size, and bubble size on fluidized-bed flotation efficiency. This study investigated the effects of different bubble and particle sizes on the separation of molybdenite ores. The results showed that the matching of bubble and particle sizes is crucial for successful separation, and this work could contribute to the optimization of fluidized-bed flotation for sulfide ores.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Energy & Fuels
Xiwei Ke, Markus Engblom, Lu Cheng, Lujian Chen, Runxia Cai, Leena Hupa, Junfu Lyu, Hairui Yang, Man Zhang
Summary: Understanding and describing fuel devolatilization behavior in a fluidized bed reactor is crucial for design and modeling purposes. Two mathematical models, isothermal particle model and one-dimensional particle model, have been developed and validated through experiments in a specially designed reactor. The results show that bed temperature and coal size impact volatile yields and nitrogen content in char. A selection principle of these models is proposed to balance calculation precision and computational time, enabling more consistent with laboratory data simulations in fluidized bed reactors.
Review
Engineering, Chemical
Raul Favaro Nascimento, Mariana Ferreira Avila, Osvaldir Pereira Taranto, Louise Emy Kurozawa
Summary: This study conducted a bibliometric analysis to examine the global panorama and trends in agglomeration in a fluidized bed over the past four decades. China, Sweden, Germany, Canada, and the United States were identified as the most productive countries in terms of publications. Keyword analysis revealed the importance of fluidization, biomass, granulation, defluidization, and coating in agglomeration in fluidized beds. The study also found that the main focuses of publications were granulation and combustion, and research emphasis is progressing towards evaluating operating parameters and measurement techniques to enhance theoretical approaches in agglomeration in fluidized beds.