Effect of grinding nozzles pressure on particle and fluid flow patterns in a spiral jet mill

Scott, Lewis; Borissova, Antonia; Burns, A. D.; Ghadiri, Mojtaba

doi:10.1016/j.powtec.2021.07.090

Cited by 8 publications

(4 citation statements)

References 18 publications

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“…This is because spiral gas-solid two-phase flow in a spiral jet mill is influenced by the operating parameters: feed rate and carrier gas pressure. [37][38][39] When the feed rate increases, the flow field retains more materials, its load greatly increases, so the particle velocity is reduced, and the collision strength among them is weakened, reducing the reaction rate. In contrast, the velocity of the particles increases with the increase of the carrier gas pressure.…”

Section: Resultsmentioning

confidence: 99%

Manufacturing of urea co-crystals by spiral gas–solid two-phase flow (S-GSF) based on spiral jet mills: a continuous, solvent-free, and scalable mechanochemical method

Song,

Jin,

Zhang

et al. 2023

CrystEngComm

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Section: Resultsmentioning

confidence: 99%

Manufacturing of urea co-crystals by spiral gas–solid two-phase flow (S-GSF) based on spiral jet mills: a continuous, solvent-free, and scalable mechanochemical method

Song,

Jin,

Zhang

et al. 2023

CrystEngComm

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“…When F = 17.5 g/s, there are more coarse particles. Therefore, both excessively large and excessively small values of F are unfavorable for the comminution of the material; there exists an optimal feed rate F, which ensures a narrow distribution of particle sizes and obtains a desirable grinding efficiency [38]. As shown in Figure 12b, the cumulative particle size distribution exhibits the smallest standard deviation when F = 10.5 g/s.…”

Section: Effect Of Feed Rate (F) On the Particle Grinding Processmentioning

confidence: 99%

Research on the Grinding Process of Superhard Particles in the Fluidized Bed Opposed Jet Mill Based on the CFD-DEM Methodology

Shen,

Jiang,

Liu

et al. 2024

Minerals

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The process of superhard particle breakage in the grinding zone of the fluidized bed opposed jet mill is investigated using the CFD-DEM (computational fluid dynamics-discrete element method) coupling method with the Tavares UFRJ Breakage Model in the present study. The effects of structural and operational parameters, such as target plate structure, nozzle position, air inlet velocity, and feed rate, on the equipment stress distribution, airflow velocity, pressure field, particle velocity, and cumulative particle size distribution are thoroughly studied to determine the optimal structural and operational parameters. Experimental validation is conducted, including scanning electron microscope (SEM) observation of particle morphology and analysis of particle size distribution of ground product particles. The simulation results indicate that the wear rate of the structure without a target plate is lower than that of the structure with a target plate in the grinding central zone. Therefore, the structure without a target plate is chosen for further investigation. The cumulative particle size distribution after grinding is influenced by nozzle position, air inlet velocity, and feed rate. The particle D50 is positively correlated with nozzle spacing and feed rate, while it is negatively correlated with air inlet velocity. The optimal grinding effect is achieved when the distance between the nozzle and the center of the grinding zone ranges from 52.5 mm to 72.55 mm, the air inlet velocity is 950 m/s, and the feed rate is 10.5 g/s. Through experimental investigation, it has been observed that when the feed rate is 10 g/s, the particle size distribution becomes more uniform. Furthermore, consistent trends in the cumulative particle size distribution in the experiment and simulation results can be found, which validates the present numerical model. It was observed that particles at low feed rates retain certain angular edges, while particle roundness increases at high feed rates.

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“…This equipment is the first choice for processing fine powder in many industries because of its simple mechanical structure. 26,27 The aim of this work is to demonstrate the continuous synthesis of several N-acylhydrazone derivatives and to establish an S-GSF technique combining mechanochemical and simple spiral jet mill equipment to improve the scalability and environmental friendliness of the overall synthesis process. We demonstrated that S-GSF can be used efficiently for the continuous synthesis of N-acylhydrazone derivatives without the addition of any organic solvent to obtain submicrometer ultrafine powder products in high yield, purity, and crystallinity.…”

Section: Introductionmentioning

confidence: 99%

“…Here, we report a spiral gas–solid two-phase flow (S-GSF) technique developed from a spiral jet mill apparatus for the continuous mechanochemical synthesis study of N- acylhydrazone derivatives. This equipment is the first choice for processing fine powder in many industries because of its simple mechanical structure. , The aim of this work is to demonstrate the continuous synthesis of several N- acylhydrazone derivatives and to establish an S-GSF technique combining mechanochemical and simple spiral jet mill equipment to improve the scalability and environmental friendliness of the overall synthesis process.…”

Section: Introductionmentioning

confidence: 99%

Continuous, Solvent-Free, and Mechanochemical Synthesis of N-Acylhydrazone Derivatives by Spiral Gas–Solid Two-Phase Flow

Song,

Jin,

Zhang

et al. 2024

ACS Sustainable Chem. Eng.

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In this work, we report a novel spiral gas−solid two-phase flow (S-GSF) technique for the continuous mechanochemical synthesis of N-acylhydrazone derivatives. The synthesis of (E)-N′-(4-nitrobenzylidene)benzoylhydrazide (compound 1) was used as a model reaction to demonstrate the feasibility of this approach. The prepared products were characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance, powder X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis, ultraviolet−visible (UV−vis) spectroscopy, and scanning electron microscopy (SEM). Results showed that the product prepared by this method was analytically pure and had a high yield. No solvent was used in the reaction, and the byproduct water was in the form of water of crystallization. Moreover, SEM images showed that the method can directly obtain ultrafine powder products that are attractive to the pharmaceutical industry. Subsequently, kinetic analysis was performed by detecting the UV−vis spectra of the products under different optimized reaction conditions. The green chemistry metrics of the method showed that it is more environmentally friendly than the conventional solution method. In addition, the method was used in preparing a variety of N-acylhydrazone derivatives by using aldehydes with different substituents.

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Effect of grinding nozzles pressure on particle and fluid flow patterns in a spiral jet mill

Cited by 8 publications

References 18 publications

Manufacturing of urea co-crystals by spiral gas–solid two-phase flow (S-GSF) based on spiral jet mills: a continuous, solvent-free, and scalable mechanochemical method

Manufacturing of urea co-crystals by spiral gas–solid two-phase flow (S-GSF) based on spiral jet mills: a continuous, solvent-free, and scalable mechanochemical method

Research on the Grinding Process of Superhard Particles in the Fluidized Bed Opposed Jet Mill Based on the CFD-DEM Methodology

Continuous, Solvent-Free, and Mechanochemical Synthesis of N-Acylhydrazone Derivatives by Spiral Gas–Solid Two-Phase Flow

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