Analysis of grinding media effect on specific breakage rate function of particles in a full-scale open circuit three-compartment cement ball mill

2015 ◽  
Vol 81 ◽  
pp. 10-17 ◽  
Author(s):  
Ö. Genç
Keyword(s):  
Ball Mill ◽  
Rate Function ◽  
Open Circuit ◽  
Full Scale ◽  
Media Effect ◽  
Grinding Media ◽  
Breakage Rate

Analysis of the breakage rate function for selected process parameters in quartzite milling

2012 ◽  
Vol 33 (1) ◽  
pp. 117-129 ◽  
Author(s):  
Tomasz Olejnik
Keyword(s):  
Process Parameters ◽  
Rate Function ◽  
Variable Number ◽  
Specific Rate ◽  
Gardner Equation ◽  
Contact Points ◽  
Batch System ◽  
Grinding Media ◽  
Breakage Rate ◽  
The Impact

Analysis of the breakage rate function for selected process parameters in quartzite milling The paper presents the results of studies on quartzite milling in a ball mill. The milling was conducted in a batch system, for diversified compositions of balls. The milling product was subjected to granulometrical, morphological and strength analyses. On the basis of the developed Reid's theory and using the Austin-Gardner equation, a form of the function circumscribing the specific rate of comminution of selected size fractions was determined. The values of the breakage rate function bi, j for the mill's apparatus conditions were determined. The impact was investigated for a variable number of grinding media contact points on the values of specific rate S and the values of the breakage rate function bi, j. Furthermore, the values of coefficients occurring in the equations circumscribing the specific rate of milling S and breakage parameter bi, j were determined.

Effects of grinding media shapes on load behaviour and mill power in a dry ball mill

2006 ◽  
Vol 19 (13) ◽  
pp. 1357-1361 ◽  
Author(s):  
N.S. Lameck ◽  
K.K. Kiangi ◽  
M.H. Moys
Keyword(s):  
Ball Mill ◽  
Grinding Media

A Study of the Effect of Mineral Particle Shapes on Breakage Rate in Ball Mill Using DEM

2013 ◽  
Vol 658 ◽  
pp. 198-201
Author(s):  
Hong Cheng Li ◽  
Wei Min Dong ◽  
Xing Ping Xie
Keyword(s):  
Discrete Element Method ◽  
Ball Mill ◽  
Great Influence ◽  
Discrete Element ◽  
Mineral Particle ◽  
Regular Tetrahedron ◽  
Breakage Rate ◽  
Impact Energies ◽  
Particle Shapes ◽  
Element Method

In order to investigative the effect of mineral particle shapes to breakage rate of ore, basing on discrete element method, comparative grinding experiments were performed separately in a laboratory ball mill under the same conditions of mass and feed by using regular tetrahedron, parallelepiped and sphere as models of mineral particle. This study shows that ore grain shapes have a great influence on breakage rate due to different impact energies in ball mill.

Instrumentation simultaneously measuring VCO2 and VO2 in humans using titration methods

1982 ◽  
Vol 52 (3) ◽  
pp. 786-791 ◽  
Author(s):  
C. M. Tsoi ◽  
D. B. Raemer ◽  
D. R. Westenskow
Keyword(s):  
Carbon Dioxide ◽  
Single Point ◽  
Open Circuit ◽  
Full Scale ◽  
Bench Test ◽  
Test Results ◽  
Short Term ◽  
Respiratory Flow ◽  
Analysis Technique ◽  
A New Technique

An instrument has been developed for the simultaneous measurement of carbon dioxide excretion (VCO2) and oxygen uptake (VO2). This instrument, the Nutrimeter, gives these breath-averaged measurements continuously without having to determine respiratory flow rate, perform timed spirometric gas collections, or determine absolute CO2 or O2 concentrations. It can be used on ventilated or nonventilated patients in long- and short-term studies. VO2 is determined via the replenishment technique. VCO2 is determined via a new technique, absorption-titration, described here. Bench test results of VCO2 measurements show a standard error of the estimate (SEE) +/- 0.591% of full scale (500 ml/min) and maximum single point error (MSPE) of +/- 3.54% over a 100--350 ml/min range. VO2 measurements show SEE +/- 0.518% of full scale (1,000 ml/min) and MSPE +/- 2.42% over a 100--450 ml/min range. In 31 human clinical trials the Nutrimeter was compared with the open-circuit spirometric collection and micro-Scholander analysis technique. VCO2 measurements show SEE +/- 2.208% and MSPE +/- 10.57% over 135--315 ml/min. VO2 measurements show SEE +/- 1.134% of full scale and MSPE +/- 9.54% over 170--360 ml/min. Response time is 60 s optimally for step changes in VO2 (0--90% of steady-state value), 90 s for VCO2.

Experimental and Numerical Study of Grinding Media Flow in a Ball Mill

2017 ◽  
Vol 40 (10) ◽  
pp. 1835-1843 ◽  
Author(s):  
Marcela V. C. Machado ◽  
Dyrney A. Santos ◽  
Marcos A. S. Barrozo ◽  
Claudio R. Duarte
Keyword(s):  
Ball Mill ◽  
Numerical Study ◽  
Grinding Media
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