Effects of Ball Size Distribution and Mill Speed and Their Interactions on Ball Milling Using DEM

2020 ◽  
pp. 1-6
Author(s):  
Mohammad AmanNejad ◽  
Kianoush Barani
Keyword(s):  
Size Distribution ◽  
Ball Milling ◽  
Ball Size ◽  
Mill Speed

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 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 Mechanochemical Ring-Opening Metathesis Polymerization: Development, Scope, and Mechano-Only Copolymer Synthesis

2021 ◽  
Author(s):  
Gue Seon Lee ◽  
Hyo Won Lee ◽  
Hyun Sub Lee ◽  
Taeyang Do ◽  
Jean-Louis Do ◽  
...  
Keyword(s):  
Solid State ◽  
Ball Milling ◽  
Ring Opening ◽  
High Speed ◽  
Wide Spectrum ◽  
Mechanical Energy ◽  
Ring Opening Metathesis Polymerization ◽  
Metathesis Polymerization ◽  
Ball Size ◽  
Milling Method

Ruthenium-alkylidene initiated ring-opening metathesis polymerization (Ru-ROMP) was realized under solid-state conditions employing a mechanochemical ball milling method, promoting greenness and broadening scope. High-speed ball milling provided sufficient mixing and energy to the reaction mixture comprised of the catalyst and solid monomers, thus eliminating the need for solvents. Studies on the catalytic species and ball milling parameters (liquid-assisted grinding, vibration frequency, and ball size) revealed that mechanical energy regulated solid-state Ru-ROMP and it follows similar mechanistic features of solution-phase reactions. The solubility and miscibility of monomer and Ru-initiator are not a limitation in solid-state ball milling. Without the use of a solvent, a wide spectrum of solid monomers, including ionomer, fluorous monomer, and macromonomers, were successfully polymerized. Finally, effective direct copolymerization of immiscible monomers such ionic/hydrophobic and ionic/fluorous monomers resulted in a set of copolymers that are difficult to make using traditional solution procedures.

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