Dry ball mixing and deagglomeration of alumina and zirconia composite fine powders using a bimodal ball size distribution

2014 ◽  
Vol 40 (9) ◽  
pp. 15293-15302 ◽  
Author(s):  
Jens Fruhstorfer ◽  
Stefan Schafföner ◽  
Christos G. Aneziris
Keyword(s):  
Size Distribution ◽  
Ball Size ◽  
Fine Powders

scholarly journals Effects of Ball Milling Processing Conditions and Alloy Components on the Synthesis of Cu-Nb and Cu-Mo Alloys

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1224 ◽  
Author(s):  
Xuekun Shang ◽  
Xitao Wang ◽  
Silian Chen
Keyword(s):  
Size Distribution ◽  
Ball Milling ◽  
Oxidation Process ◽  
Processing Parameters ◽  
Processing Conditions ◽  
Cold Welding ◽  
Immiscible Alloys ◽  
Ball Size ◽  
Milling Method

The effects of processing parameters in ball milling and the different behaviors of Cu-Nb and Cu-Mo alloys during milling were investigated. High powder yields can be obtained by changing the BPR value and ball size distribution and no clear dependence of BPR value on powder yield can be found from the experiment results. The addition of oxygen can largely reduce the effect of excessive cold welding during ball milling. A “two-step” ball milling method was introduced to evaluate the different evolution processes and morphologies in different alloys. With 8 h pre-milling, this method considerably benefits the oxidation process of Mo and shows its promising potential in the synthesis of immiscible alloys. Based on the experiment results and analysis, we suggest that the different behaviors of Cu-Nb and Cu-Mo alloys are related to the shear modules and different tendencies to be oxidized.

scholarly journals Exploring the End-Liner Forces Using DEM Software

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1047
Author(s):  
Ngonidzashe Chimwani ◽  
Murray M. Bwalya
Keyword(s):  
Discrete Element Method ◽  
Size Distribution ◽  
Ball Milling ◽  
Discrete Element ◽  
Significant Cost ◽  
Cost Component ◽  
Dem Simulation ◽  
Ball Size ◽  
Ball Motion ◽  
Simulation Scheme

The main roles of liners are to protect the mill shell and promote effective ball motion for grinding. For this reason the liner profile is carefully selected to ensure that the productivity is maximized and due liner replacement is made when this objective is no longer met. These issues have been extensively studied on shell liners as mill relining is a significant cost component of ball milling. To date, not much has been written about end-liners and the kind of forces they are subjected to. A discrete element method (DEM) simulation scheme is conducted to look at how ball size distribution, mill filling, end-liner configuration and shape affect the distribution of forces acting on the liners that were assessed to understand end-liner wear and damage. The results showed how forces varied both radially and tangentially for the different sections of end-liner, with important insights drawn for end-liner manufactures.

scholarly journals Effect of size distribution on compressive property of fine powders.

1990 ◽  
Vol 16 (5) ◽  
pp. 1074-1079 ◽  
Author(s):  
Michitaka Suzuki ◽  
Yukitoshi Nakatsuji ◽  
Mitsuaki Hirota ◽  
Toshio Oshima
Keyword(s):  
Size Distribution ◽  
Compressive Property ◽  
Fine Powders

scholarly journals Comparison of alumina ball size distribution in two white cement grinding units using Swebrec function

DYNA ◽  
2019 ◽  
Vol 86 (209) ◽  
pp. 25-29
Author(s):  
Lina María Chica Osorio ◽  
Ismael Eduardo Rivera ◽  
Marlon Rincón Fulla ◽  
Adriana Marcela Osorio ◽  
Moisés Oswaldo Bustamante ◽  
...  
Keyword(s):  
Experimental Data ◽  
Steady State ◽  
Size Distribution ◽  
Distribution Model ◽  
Ball Size ◽  
White Cement ◽  
Swebrec Function ◽  
Cement Grinding ◽  
Alumina Ball

The results of characterizing the alumina ball size distribution in two mills of a crushing and grinding plant are shown. The mills were unloaded and the ball charge was screened in order to establish the ball size distribution. For both mills, the balls retained during the unloading were compared to the balls retained at the beginning of the process, and additionally, they were compared to the results obtained by the Swebrec adjusted distribution model. In both cases, the experimental data have had a good fit with this model. This practice is important in order to establish the best ball charge at the beginning of the operation and the ball recharge in the steady state.

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.

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