scholarly journals Particle Size Distribution Models for Metallurgical Coke Grinding Products

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1288
Author(s):  
Laura Colorado-Arango ◽  
Juan M. Menéndez-Aguado ◽  
Adriana Osorio-Correa
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Ultrafine Particles ◽  
Goodness Of Fit ◽  
Metallurgical Coke ◽  
Ball Size ◽  
Grinding Conditions ◽  
Comparison Criteria ◽  
Grinding Time

Six different particle size distribution (Gates–Gaudin–Schuhmann (GGS), Rosin–Rammler (RR), Lognormal, Normal, Gamma, and Swebrec) models were compared under different metallurgical coke grinding conditions (ball size and grinding time). Adjusted R2, Akaike information criterion (AIC), and the root mean of square error (RMSE) were employed as comparison criteria. Swebrec and RR presented superior comparison criteria with the higher goodness-of-fit and the lower AIC and RMSE, containing the minimum variance values among data. The worst model fitting was GGS, with the poorest comparison criteria and a wider results variation. The undulation Swebrec parameter was ball size and grinding time-dependent, considering greater b values (b > 3) at longer grinding times. The RR α parameter does not exhibit a defined tendency related to grinding conditions, while the k parameter presents smaller values at longer grinding times. Both models depend on metallurgical coke grinding conditions and are hence an indication of the grinding behaviour. Finally, oversize and ultrafine particles are found with ball sizes of 4.0 cm according to grinding time. The ball size of 2.54 cm shows slight changes in particle median diameter over time, while 3.0 cm ball size requires more grinding time to reduce metallurgical coke particles.

scholarly journals The Effect of Grinding Media on Mineral Breakage Properties of Magnetite Ores

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Liang Si ◽  
Yijun Cao ◽  
Guixia Fan
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Production Capacity ◽  
Milling Process ◽  
Ball Size ◽  
Grinding Media ◽  
Grinding Conditions ◽  
Steel Balls ◽  
Different Diameters

The breakage and liberation of minerals are the key to fluidized mining for minerals. In the ball milling process, steel balls function as not only a grinding action implementer but also energy carrier to determine the breakage behavior of ores and the production capacity of the mill. When ground products present a much coarse or much fine particle size distribution, the separation process will suffer, resulting in inefficient recovery of useful minerals. Optimal control of the particle size distribution of the products is therefore essential, but the complexity and randomness of ball mill grinding make it difficult to determine the appropriate ball size. To solve the problem in the precise measurement of grinding ball diameters, this paper carried out magnetite grinding experiments with grinding balls of different diameters under the same grinding conditions to study the influence pattern of steel ball diameters on the particle break behavior, the particle size distribution of ground products, and the mineral liberation degree distribution. The research proposed on the matching relation between the ball size and the quality of ground products is essential for improving the ground product quality and reducing energy consumption.

Aerosols at Salzburg Airport: Long-term measurements of ultrafine particles at two locations along the runway/Aerosole am Salzburger Flughafen: Langzeitmessungen von ultrafeinen Partikeln an zwei Messstellen neben der Rollbahn

Gefahrstoffe ◽  
2019 ◽  
Vol 79 (06) ◽  
pp. 227-234
Author(s):  
M. Vorage ◽  
P. Madl ◽  
A. Hubmer ◽  
H. Lettner
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Ultrafine Particles ◽  
Aircraft Noise ◽  
Aircraft Engines ◽  
Limited Data ◽  
Background Levels ◽  
Close Proximity

This paper unequivocally links particle emissions to specific planes engaged in landing and take-off (LTO) activity at Salzburg Airport (SZG, Austria). This is possible because particles were counted in ten second intervals over multiple months at two locations simultaneously upwind and downwind in close proximity of the runway. As background levels are relatively low and LTO activities are limited, data on aircraft noise and identity enables the allocation of sharp and short-lived spikes of particle concentrations to specific aircraft located upwind. In addition, the spike shapes may even be used to identify engine modes and deduce conjectures on LTO movements of the plane. Particle size distribution measurements confirm aircraft engines as the site of origin.

scholarly journals Effectiveness of the Top-Down Nanotechnology in the Production of Ultrafine Cement (~220 nm)

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Byung-Wan Jo ◽  
Sumit Chakraborty ◽  
Ki Heon Kim ◽  
Yun Sung Lee
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Milling Process ◽  
Sustainable Construction ◽  
Cement Particle ◽  
Top Down ◽  
Bead Milling ◽  
Grinding Time ◽  
Ultrafine Cement

The present investigation is dealing with the communition of the cement particle to the ultrafine level (~220 nm) utilizing the bead milling process, which is considered as a top-down nanotechnology. During the grinding of the cement particle, the effect of various parameters such as grinding time (1–6 h) and grinding agent (methanol and ethanol) on the production of the ultrafine cement has also been investigated. Performance of newly produced ultrafine cement is elucidated by the chemical composition, particle size distribution, and SEM and XRD analyses. Based on the particle size distribution of the newly produced ultrafine cement, it was assessed that the size of the cement particle decreases efficiently with increase in grinding time. Additionally, it is optimized that the bead milling process is able to produce 90% of the cement particle<350 nm and 50% of the cement particle<220 nm, respectively, after 6.3 h milling without affecting the chemical phases. Production of the ultrafine cement utilizing this method will promote the construction industries towards the development of smart and sustainable construction materials.

scholarly journals Improved Parameterization of Fertilizer Particle Size Distribution

1998 ◽  
Vol 81 (5) ◽  
pp. 935-942 ◽  
Author(s):  
Edmund Perfect ◽  
Qiang Xu ◽  
David L Terry
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Goodness Of Fit ◽  
Physical Property ◽  
Distribution Functions ◽  
Parameter System ◽  
Common System ◽  
Best Parameter ◽  
Log Normal

Abstract Particle size distribution is an important physical property of granular fertilizers that influences their bulk behavior (e.g., packing and segregation). Several parameter systems for fertilizer particle size distributions are analyzed in this paper. The most common system used by the fertilizer industry is the SGN-UI system, where SGN is the size guide number (the median particle size) and Ul is the uniformity index (the 10th percentile particle size expressed as a percentage of the 95th percentile particle size). This 2-parameter system, however, has many limitations. For example, it does not give a distribution function. Furthermore, the Ul parameter does not accurately reflect the spread of particle sizes. It is therefore necessary to find a better parameterization system. Three size distribution functions (the log-normal, the Rosin-Rammler and the Gaudin-Schuhmann equations) were tested on a size distribution database composed of 377 samples from 7 fertilizer materials. Each function was fitted to the data by nonlinear regression. The Rosin-Rammler function is the best parameter system on the basis of an analysis of variance of the sum of squares of error from the nonlinear fits. Comparisons between the Rosin-Rammler and the SGN-UI parameters were also made. The Rosin- Rammler system is more accurate than the SGN-UI system, possesses the ability of prediction, and provides a measure of the goodness of fit. Therefore, the Rosin-Rammler system should be used to characterize size distribution of granular fertilizer materials instead of the SGN-UI system.

scholarly journals Breakage Characterization of Grinding Media Based on Energy Consumption and Particle Size Distribution: Hexagons versus Cylpebs

Minerals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 527 ◽  
Author(s):  
Caibin Wu ◽  
Ningning Liao ◽  
Guiming Shi ◽  
Liangliang Zhu
Keyword(s):  
Particle Size ◽  
Energy Consumption ◽  
Particle Size Distribution ◽  
Specific Surface ◽  
Bulk Density ◽  
Size Distribution ◽  
Surface Area ◽  
Specific Surface Area ◽  
Grinding Media ◽  
Grinding Conditions

The grinding performance of hexagon grinding media particles has been compared with that of cylpebs grinding media particles. A batch grinding test was conducted using equal masses of hexagons and cylpebs. The particle size distribution and energy consumption during grinding of the ground product were analyzed, and the relationships among the specific surface area, bulk density, energy consumption, and t10 value are discussed. Under the same grinding conditions, the grinding capacity of hexagons was inferior to that of cylpebs. However, as the particle size of the feed became finer, the grinding effect of hexagons became more apparent. At the same time, the qualified particles content in the ground product was higher when using hexagons than when using cylpebs. The relationship between the specific surface area and energy consumption during grinding was consistent with the regular pattern of grinding fineness and energy consumption. In addition, the bulk density of minerals decreases with an increase in grinding energy. The same conclusion was obtained when −0.425 mm tungsten ore was used as a sample for validation. The flotation experiment result has carried out that hexagons as grinding media have a better flotation indicator than cylpebs in the same grinding fineness. It is demonstrated that although the grinding capacity of hexagons is inferior to that of cylpebs, less overgrinding occurs when using hexagons than when using cylpebs. For tungsten ore grinding, hexagons act as a finer grinding media than cylpebs.

scholarly journals Effect of Grinding Time on the Particle Size Distribution Characteristics of Tuff Powder

2021 ◽  
pp. X
Author(s):  
Shuhua LIU ◽  
Hao WANG ◽  
Hongling WANG
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Milling Time ◽  
Milling Process ◽  
Coarse Grained ◽  
Distribution Model ◽  
Fine Grained ◽  
Fractal Characteristics ◽  
Grinding Time

We study the grinding dynamic behavior and particle size distribution (PSD) characteristics of tuff powder. With the analysis of particle size and data of activity test, the results indicate that tuff powder is easy to be ground for the coarse-grained while is difficult for the fine-grained. It is feasible to quantitatively express the milling process of tuff powder by Divas-Aliavden milling dynamic equation. The milling speed and the milling time are negatively correlated, and the grinding efficiency is minimized after 60 min. Equivalent particle size (EPS) is positively linearly correlated with the logarithm of grinding time, while specific surface area (SSA) is inversely correlated, both of them have a highly linear correlation. The PSD of tuff powder, which complies well with the Rosin-Rammler-Bennet (RRB) distribution model, has typical fractal characteristics, and its fractal dimension is also positively correlated with the milling time.

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