Grinding Kinetics of Lotus Leaf Powder in a Stirred Media Mill

2019 ◽  
Vol 62 (6) ◽  
pp. 1631-1638
Author(s):  
Jianfeng Yu ◽  
Jiang Zhao ◽  
Li Wang
Keyword(s):  
Particle Size ◽  
Stress Intensity ◽  
Specific Energy Consumption ◽  
Grinding Process ◽  
Lotus Leaf ◽  
Grinding Media ◽  
Leaf Powder ◽  
Grinding Kinetics ◽  
Kinetics Of ◽  
Stirred Media Mill

Abstract. Stirred media mills are invoked as high energy utilization equipment to prepare superfine particles with a narrow particle size distribution. In this study, the effects of the stirrer tip speed and the grinding media diameter on the particle size distribution of lotus leaf powder (LLP) were investigated. The stress intensity and stress number, which were determined by the stirrer tip speed and grinding media diameter, were applied to estimate the wet grinding kinetics of LLP. The stress conditions with the minimum specific energy consumption were a grinding media diameter of 1.4 mm and stirrer tip speed of 8.4 m s-1. Additionally, FT-IR measurements of the samples confirmed that the chemical structures of the active ingredients were not damaged with reduction in particle size, which indicated the mildness of the grinding process.HighlightsA stirred media mill was initially applied for preparing superfine lotus leaf powder.The stress conditions with the minimum specific energy consumption were determined.The active ingredients were not denatured during the grinding process. Keywords: Grinding kinetics, Lotus leaf, Stirred media mill, Stress intensity.

Study on Grinding Kinetics of a Unique Double-Sphere Grinding Media for Cassiterite-Polymetallic Sulphide Ores

2013 ◽  
Vol 457-458 ◽  
pp. 236-239
Author(s):  
Jin Peng Feng ◽  
Xia Feng ◽  
Shao Jian Ma ◽  
Jie Liu ◽  
Wei Mo ◽  
...  
Keyword(s):  
Sulfide Ores ◽  
Size Fractions ◽  
Grinding Media ◽  
Sulphide Ores ◽  
Grinding Kinetics ◽  
Different Diameters ◽  
Grinding Efficiency ◽  
Kinetics Of

The grinding kinetics are strongly affected by the grinding media size and style, in order to improve the grinding efficiency and solve the over-grinding problem of cassiterite in the process of grinding in cassiterite-polymetallic sulfide ores plant. A unique double-sphere grinding media has been designed and the grinding kinetics of this media with different diameters for grinding products of different size fractions have been investigated in this paper.

scholarly journals Grinding Kinetics Adjustment of Copper Ore Grinding in an Innovative Electromagnetic Mill

2018 ◽  
Vol 8 (8) ◽  
pp. 1322 ◽  
Author(s):  
Marta Wołosiewicz-Głąb ◽  
Paulina Pięta ◽  
Dariusz Foszcz ◽  
Szymon Ogonowski ◽  
Tomasz Niedoba
Keyword(s):  
Particle Size ◽  
Size Fraction ◽  
Processing Parameters ◽  
Relative Increase ◽  
Grinding Process ◽  
Particle Size Fraction ◽  
Copper Ore ◽  
Media Type ◽  
Grinding Media ◽  
Ultrafine Grinding

The paper presents a study on the effectiveness of the grinding process in an electromagnetic mill devoted to ultrafine grinding, and the influence of processing parameters on the mill’s performance. The research was focused on the optimization of the duration of the grinding process and selection of the grinding media type in order to obtain the highest relative increase of the selected particle size fraction. Copper ore with a particle size between 0–1 mm was used in the experiments. A model was created that determines the relationship between the processing time and efficiency of the grinding, and can be used for the optimization of the process. A comparison of the relative growth of particle size fractions in milling products was performed. The obtained milling efficiency results measured by the growth of the analyzed particle size fraction in the milling product confirmed that the best grinding media set includes a grinding medium with a diameter of 1 mm and a length of 10 mm.

scholarly journals Analysis of a grinding efficiency in the electromagnetic mill for variable process and feed parameters

2017 ◽  
Vol 18 ◽  
pp. 01012
Author(s):  
Marta Wołosiewicz-Głąb ◽  
Dariusz Foszcz ◽  
Daniel Saramak ◽  
Tomasz Gawenda ◽  
Damian Krawczykowski
Keyword(s):  
Particle Size ◽  
Raw Materials ◽  
Raw Material ◽  
Grinding Process ◽  
Key Factors ◽  
Copper Ore ◽  
Factors Affecting ◽  
Grinding Media ◽  
Grinding Efficiency ◽  
The Impact

Article describes issues related to the assessment of raw materials grinding efficiency in an electromagnetic mill. Application of such type of mill in grinding processes can result in measurable benefits of more efficient raw material grinding by reducing time needed to produce a product of a suitable particle size compared to conventional mills. The expected effect of application of a system based on an electromagnetic mill is to achieve a lower energy consumption of grinding process for raw material processing compared to the existing equipment used for the fine grinding. A key element of correct design of comminution circuits in processing of particular feed mineral is to identify the impact of key factors affecting the efficiency of the grinding process. The most important factors determining the efficiency of the grinding process are the time, the construction parameters of the machine, the type of grinding media used in grinding process, as well as the parameters of the feed, among others the crushing resistance or particle size. The paper presents the results of kinetic study of copper ore grinding in electromagnetic mill for variable feed particle size distribution of and different sizes of grinding media.

Grinding kinetics of nano-sized particles for different electrostatic stabilizing acids in a stirred media mill

2013 ◽  
Vol 235 ◽  
pp. 1008-1016 ◽  
Author(s):  
Carsten Schilde ◽  
Sandra Breitung-Faes ◽  
Ingo Kampen ◽  
Arno Kwade
Keyword(s):  
Grinding Kinetics ◽  
Kinetics Of ◽  
Stirred Media Mill

Effects of particle size and ferric hydroxo complex produced by different grinding media on the flotation kinetics of pyrite

2020 ◽  
Vol 360 ◽  
pp. 1028-1036 ◽  
Author(s):  
Xiaolong Zhang ◽  
Yuexin Han ◽  
Peng Gao ◽  
Yanjun Li ◽  
Yongsheng Sun
Keyword(s):  
Particle Size ◽  
Hydroxo Complex ◽  
Flotation Kinetics ◽  
Grinding Media ◽  
Kinetics Of

The Effect of Ball Media with Different Diameters on Grinding Kinetics of Cassiterite-Polymetallic Sulphides

2013 ◽  
Vol 470 ◽  
pp. 154-157
Author(s):  
Jin Peng Feng ◽  
Xia Feng ◽  
Shao Jian Ma ◽  
Jie Liu ◽  
Wei Mo ◽  
...  
Keyword(s):  
Ball Mill ◽  
Fine Particles ◽  
Coarse Particles ◽  
Sulfide Ores ◽  
First Order ◽  
Grinding Media ◽  
Grinding Kinetics ◽  
Different Diameters ◽  
Kinetics Of

To investigate the effects of grinding media size on the grinding kinetics of cassiterite-polymetallic sulfide ores, the ball grinding media with diameters of 25mm, 30mm, 35mm and 40mm were studied in a laboratory ball mill. The results showed that the coarse and fine particles obeyed the first-order grinding kinetics laws in the process of grinding and the ball grinding media with 35mm diameter had a significant advantage on grinding up the coarse particles and controlling the generation of fine particles, which could provide theoretical guidance for practical production so that the grinding effects would be improved effectively and the problem of cassiterite over-grinding would also be settled very well.

Determination of grinding parameters of fenugreek seed

1970 ◽  
Vol 26 (1) ◽  
pp. 16 ◽  
Author(s):  
S Balasubramanian ◽  
Rajkumar Rajkumar ◽  
K K Singh
Keyword(s):  
Particle Size ◽  
Energy Consumption ◽  
Moisture Content ◽  
Specific Energy ◽  
Feed Rate ◽  
Average Particle Size ◽  
Specific Energy Consumption ◽  
Average Particle ◽  
Fenugreek Seeds ◽  
Fenugreek Seed

Experiment to identify ambient grinding conditions and energy consumed was conducted for fenugreek. Fenugreek seeds at three moisture content (5.1%, 11.5% and 17.3%, d.b.) were ground using a micro pulverizer hammer mill with different grinding screen openings (0.5, 1.0 and 1.5 mm) and feed rate (8, 16 and 24 kg h-1) at 3000 rpm. Physical properties of fenugreek seeds were also determined. Specific energy consumptions were found to decrease from 204.67 to 23.09 kJ kg-1 for increasing levels of feed rate and grinder screen openings. On the other hand specific energy consumption increased with increasing moisture content. The highest specific energy consumption was recorded for 17.3% moisture content and 8 kg h-1 feed rate with 0.5 mm screen opening. Average particle size decreased from 1.06 to 0.39 mm with increase of moisture content and grinder screen opening. It has been observed that the average particle size was minimum at 0.5 mm screen opening and 8 kg h-1 feed rate at lower moisture content. Bond’s work index and Kick’s constant were found to increase from 8.97 to 950.92 kWh kg-1 and 0.932 to 78.851 kWh kg-1 with the increase of moisture content, feed rate and grinder screen opening, respectively. Size reduction ratio and grinding effectiveness of fenugreek seed were found to decrease from 4.11 to 1.61 and 0.0118 to 0.0018 with the increase of moisture content, feed rate and grinder screen opening, respectively. The loose and compact bulk densities varied from 219.2 to 719.4 kg m-3 and 137.3 to 736.2 kg m-3, respectively.  

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