The Experts below are selected from a list of 231 Experts worldwide ranked by ideXlab platform
Peter Kleinebudde - One of the best experts on this subject based on the ideXlab platform.
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experimental determination of residence time distribution in continuous dry granulation
International Journal of Pharmaceutics, 2017Co-Authors: Haress Mangal, Peter KleinebuddeAbstract:Abstract With increasing importance of continuous manufacturing, the interest in integrating dry granulation into a continuous manufacturing line is growing. Residence time distribution measurements are of importance as they provide information about duration of materials within the process. These data enable traceability and are highly beneficial for developing control strategies. A digital image analysis system was used to determine the residence time distribution of two materials with different deformation behavior (brittle, plastic) in the Milling unit of dry granulation systems. A colorant was added to the material (20% w/w iron oxide), which did not affect the material properties excessively, so the Milling process could be mimicked well. Experimental designs were conducted to figure out which parameters effect the mean residence time strongly. Moreover, two types of dry granulation systems were contrasted. Longer mean residence times were obtained for the oscillating Mill (OM) compared to the conical Mill (CM). For co-processed microcrystalline cellulose residence times of 19.8–44.4 s (OM) and 11.6–29.1 s (CM) were measured, mainly influenced by the specific compaction force, the Mill Speed and roll Speed. For dibasic calcium phosphate anhydrate residence times from 17.7–46.4 (OM) and 5.4–10.2 s (CM) were measured, while here the specific compaction force, the Mill Speed and their interactions with the roll Speed had an influence on the mean residence time.
Haress Mangal - One of the best experts on this subject based on the ideXlab platform.
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experimental determination of residence time distribution in continuous dry granulation
International Journal of Pharmaceutics, 2017Co-Authors: Haress Mangal, Peter KleinebuddeAbstract:Abstract With increasing importance of continuous manufacturing, the interest in integrating dry granulation into a continuous manufacturing line is growing. Residence time distribution measurements are of importance as they provide information about duration of materials within the process. These data enable traceability and are highly beneficial for developing control strategies. A digital image analysis system was used to determine the residence time distribution of two materials with different deformation behavior (brittle, plastic) in the Milling unit of dry granulation systems. A colorant was added to the material (20% w/w iron oxide), which did not affect the material properties excessively, so the Milling process could be mimicked well. Experimental designs were conducted to figure out which parameters effect the mean residence time strongly. Moreover, two types of dry granulation systems were contrasted. Longer mean residence times were obtained for the oscillating Mill (OM) compared to the conical Mill (CM). For co-processed microcrystalline cellulose residence times of 19.8–44.4 s (OM) and 11.6–29.1 s (CM) were measured, mainly influenced by the specific compaction force, the Mill Speed and roll Speed. For dibasic calcium phosphate anhydrate residence times from 17.7–46.4 (OM) and 5.4–10.2 s (CM) were measured, while here the specific compaction force, the Mill Speed and their interactions with the roll Speed had an influence on the mean residence time.
M H Moys - One of the best experts on this subject based on the ideXlab platform.
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effects of slurry filling and Mill Speed on the net power draw of a tumbling ball Mill
Minerals Engineering, 2014Co-Authors: Francois K Mulenga, M H MoysAbstract:The pool of slurry is known to lower the power drawn to the Mill. An attempt to ascertain this observation by relating load orientation to Mill power for a range of Speeds and slurry fillings was undertaken. To this end, a Platinum ore (−850 μm) was used to prepare a slurry at 65% solids concentration by mass. The Wits pilot Mill (552 × 400 mm), initially loaded with 10 mm balls at 20% volumetric filling, was run at 5 different Speeds between 65% and 85% of critical. The net power draw and media charge position were measured. After this, the slurried ore was gradually added to the media charge for slurry filling U between 0 and 3. A proximity probe and a conductivity sensor mounted on the Mill shell provided a means of measuring both the position of the media charge and that of slurry. The data collected for the load behaviour and net power draw was later analysed. It was found that Morrell’s model could not fully explain the effect of slurry volume on net power draw especially for an under-filled media charge (i.e., for U < 1). The size of lifters and grinding balls used could be the reason for this. That is why a piece-wise function was curve-fitted to the power data to help make sense of the inconsistencies observed.
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particle filling and size effects on the ball load behaviour and power in a dry pilot Mill experimental study
Powder Technology, 2008Co-Authors: Kiangi K. Kiangi, M H MoysAbstract:Abstract The ball load behaviour in a pilot Mill is studied under conditions of increasing particle filling, for coarse silica feed (0.8–1.8 mm) and fine silica feed (0.075–0.3 mm), at the Mill Speeds of 63, 78, 88 and 98% of the critical. An inductive probe is used to obtain the ball load behaviour independent of particles present in the Mill. The difference in Mill power draw obtained from the coarse and fine particle charges are explained via their load behaviour signals. The effect of particle filling and size on the ball load behaviour is quantified through the toe and shoulder angular positions. Radial segregation of the coarse silica particles to the periphery of the charge occurs. A radial segregation index related to the extent of drop in the inductive probe's signal has been defined and used to quantify radial segregation as a function of particle filling and Mill Speed.
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further validation of dem modeling of Milling effects of liner profile and Mill Speed
Minerals Engineering, 2003Co-Authors: O Hlungwani, J Rikhotso, H Dong, M H MoysAbstract:Grinding Mills are usually lined with lifters to improve their efficiency. During the course of operation, the lifters are worn away. This will affect the energy efficiency and capacity of Mills and the behavior of the load in the Mill and finally leads to a relining to replace the worn lifters. However, the effects of the profiles of lifters are not taken into account in all the previous power models for rotary Mills. Discrete element method (DEM) is capable of demonstrating the effects of lifter profiles on Mill power and load behavior. In this paper, two types of lifter profiles, square and trapezoidal, are investigated in terms of Mill power and load behavior with a 2D Mill and a DEM simulator, Millsoft, over a wide range of rotational Speed. DEM satisfactorily predicted the load behavior and power draw for different lifter profiles at sub-critical Speeds comparing with the experimental results. It is found that the trapezoidal lifters draw more power than the square lifters. An attempt has been made to explain the difference between measured and simulated power using photographs of experimental load behavior.
E.a.p. Egbe - One of the best experts on this subject based on the ideXlab platform.
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determination of the bond s work index of baban tsauni nigeria lead gold ore
European Scientific Journal ESJ, 2013Co-Authors: E.a.p. Egbe, E. Mudiare, O. K. Abubakre, M. I. OgunbajoAbstract:The energy required to grind one tonne of an ore from a given feed size to a specified product size is a material property that needs to be determined for different ore deposits. The Bond’s work index has generally been accepted as a measure of the grindability of an ore. This study used quartz as a reference ore via a comparative method to determine the Bond’s work index of Baban Tsauni Nigeria) ore. The same amount of energy was utilized in grinding the reference and test ore with the same particle size distribution under the same grinding conditions. Typical feed load and Mill Speed in practice were used in order to make the grinding environment as close as possible to that in large scale grinding. The Bond’s work index of Baban Tsauni (Nigeria) ore was found to be 11.52kWh/tonne.
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DETERMINATION OF THE BOND’S WORK INDEX OF BABAN TSAUNI (NIGERIA) LEAD-GOLD ORE
European Scientific Journal ESJ, 2013Co-Authors: E.a.p. Egbe, E. Mudiare, O. K. Abubakre, M. I. OgunbajoAbstract:The energy required to grind one tonne of an ore from a given feed size to a specified product size is a material property that needs to be determined for different ore deposits. The Bond’s work index has generally been accepted as a measure of the grindability of an ore. This study used quartz as a reference ore via a comparative method to determine the Bond’s work index of Baban Tsauni Nigeria) ore. The same amount of energy was utilized in grinding the reference and test ore with the same particle size distribution under the same grinding conditions. Typical feed load and Mill Speed in practice were used in order to make the grinding environment as close as possible to that in large scale grinding. The Bond’s work index of Baban Tsauni (Nigeria) ore was found to be 11.52kWh/tonne.
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Effects of Ball Milling Conditions on Breakage Response of Baban Tsauni (Nigeria) Lead-Gold Ore.
IOSR Journal of Mechanical and Civil Engineering, 2013Co-Authors: E.a.p. EgbeAbstract:The effects of ball Milling conditions on breakage response of Baban Tsauni (Nigeria) lead-gold ore was examined in this research work. The three factors considered were, the grinding media mass to ore sample mass ratio, the grinding time and the ball Mill Speed. The breakage response measured in terms of cumulative per cent mass passing the liberation size increased with increase in media mass to sample mass ratio and reached optimum at a ratio of 10:1. The response per unit time decreased as the grinding time was increased gradually from 2minutes to 10minutes, thereby indicating that long grinding circuits were poor in performance. The optimum ball Milling Speed of the ore was found to be 82.9% of the critical Mill Speed. This work established a rational approach in the choice of grinding Speed. The effects of the three parameters on generation of fines were less pronounced.
M. I. Ogunbajo - One of the best experts on this subject based on the ideXlab platform.
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DETERMINATION OF THE BOND’S WORK INDEX OF BABAN TSAUNI (NIGERIA) LEAD-GOLD ORE
European Scientific Journal ESJ, 2013Co-Authors: E.a.p. Egbe, E. Mudiare, O. K. Abubakre, M. I. OgunbajoAbstract:The energy required to grind one tonne of an ore from a given feed size to a specified product size is a material property that needs to be determined for different ore deposits. The Bond’s work index has generally been accepted as a measure of the grindability of an ore. This study used quartz as a reference ore via a comparative method to determine the Bond’s work index of Baban Tsauni Nigeria) ore. The same amount of energy was utilized in grinding the reference and test ore with the same particle size distribution under the same grinding conditions. Typical feed load and Mill Speed in practice were used in order to make the grinding environment as close as possible to that in large scale grinding. The Bond’s work index of Baban Tsauni (Nigeria) ore was found to be 11.52kWh/tonne.
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determination of the bond s work index of baban tsauni nigeria lead gold ore
European Scientific Journal ESJ, 2013Co-Authors: E.a.p. Egbe, E. Mudiare, O. K. Abubakre, M. I. OgunbajoAbstract:The energy required to grind one tonne of an ore from a given feed size to a specified product size is a material property that needs to be determined for different ore deposits. The Bond’s work index has generally been accepted as a measure of the grindability of an ore. This study used quartz as a reference ore via a comparative method to determine the Bond’s work index of Baban Tsauni Nigeria) ore. The same amount of energy was utilized in grinding the reference and test ore with the same particle size distribution under the same grinding conditions. Typical feed load and Mill Speed in practice were used in order to make the grinding environment as close as possible to that in large scale grinding. The Bond’s work index of Baban Tsauni (Nigeria) ore was found to be 11.52kWh/tonne.
