Effect of media size in stirred ball mill grinding of coal

Mankosa, M.J.; Adel, G.T.; Yoon, Roe‐Hoan

doi:10.1016/0032-5910(86)85008-2

Cited by 98 publications

(27 citation statements)

References 3 publications

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“…Although this range is consistent with the observation here, the lower limit of the media-feed size ratio is about I 0 : I, possibly due to the grinding mechanism. Mankosa et al 10 ) found that maximum breakage occurs with a media-feed ratio of 20: I. Our results show that the media-feed ratio should be less than this value.…”

Section: Media Sizesupporting

confidence: 40%

Ultrafine Grinding in an Annular Ball Mill

Orumwense

Forssberg

1990

KONA

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Section: Media Sizesupporting

confidence: 40%

Ultrafine Grinding in an Annular Ball Mill

Orumwense

Forssberg

1990

KONA

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“…the fraction of the fragments produced by breaking particles of size xi that are smaller than size Xi, <l>i; a, and yare constants which may vary with the size (xi) being broken. In several studies, the above grinding model has been shown to be applicable to stirred ball milling [2,[20][21][22][23]. Generally, the trends in the breakage parameters were found to be similar to those for conventional, tumbling ball milling.…”

Section: 1mentioning

confidence: 90%

“…Generally, the trends in the breakage parameters were found to be similar to those for conventional, tumbling ball milling. Mankosa et al [22,24] determined breakage rates for coals in the size range of 20x 140 US mesh ground in a stirred ball mill. The grinding kinetics showed first-order behavior and for a given ball size, the breakage rates followed the trend shown in Figure 1.…”

Section: 1mentioning

confidence: 99%

“…Breakage distributions seem to be relatively insensitive to media size. Based on such data as are available and on indirect evidence from the work of Kwade et a!., [11,15] and others [2,6,7,22,23,34], it appears that the trade-off between stress intensity and stress frequency becomes especially critical at ultrafine sizes. Changing media size can lead to enhanced breakage in one range of sizes but simultaneously to reduced rates for slightly coarser material.…”

Section: Breakage Parameters In Fine Stirred-media Millingmentioning

confidence: 99%

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A Review of Breakage Behavior in Fine Grinding by Stirred-Media Milling

Hogg¹,

Cho

2000

KONA

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“…The ability to achieve mineral matter liberation from coal is fundamental to all separation techniques that seek to produce super-clean coal. It has been concluded from the microscopic examination of a wide variety of U.S. coals that, in many cases, grinding to 10 µm or below may be necessary in order to achieve the necessary liberation (2). It is clear, therefore, that future advanced coal cleaning technologies must be capable of accommodating micron size particles.…”

Section: Introductionmentioning

confidence: 99%

Aqueous Biphase Extraction for Processing of Fine Coal

Osseo‐Asare¹

2001

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Ever-stringent environmental constraints dictate that future coal cleaning technologies be compatible with micron-size particles. This research program seeks to develop an advanced coal cleaning technology uniquely suited to micron-size particles, i.e., aqueous biphase extraction. The partitioning behaviors of silica in the polyethylene glycol (PEG)/dextran (Dex) and dextran/Triton X-100 (TX100) systems have been investigated, and the effects of sodium dodecylsulfate (SDS) and dodecyltrimethylammonium bromide (DTAB) on solid partition have been studied. In both biphase systems, silica particles stayed in the top PEG-rich phase at low pH. With increase in pH, the particles moved from the top phase to the interface, then to the bottom phase. At very high pH, the solids preferred the top phase again. These trends are attributable to variations in the polymer/solid and nonionic surfactant/solid interactions. Addition of ionic surfactants into these two systems introduces a weakly charged environment, since ionic surfactants concentrate into one phase, either the top phase or the bottom phase. Therefore, coulombic forces also play a key role in the partition of silica particles because electrostatic attractive or repulsive forces are produced between the solid surface and the ionic-surfactant-concentrated phase. For the PEG/dextran system in the presence of SDS, SiO 2 preferred the bottom dextran-rich phase above its pH PZC . However, addition of DTAB moved the oxide particles from the top phase to the interface, and then to the bottom phase, with increase in pH. These different behaviors are attributable to the fact that SDS and DTAB concentrated into the opposite phase of the PEG/dextran system. On the other hand, in the dextran/Triton X-100 system, both ionic surfactants concentrated in the top surfactant-rich phase and formed mixed micelles with TX100. Therefore, addition of the anionic surfactant, SDS, moved the silica particles from top phase to the interface or bottom phase. On the other hand, DTAB, a cationic surfactant, attracted the particles to the top phase in the pH range form 4 to 11, where in the DTAB-free system the solids either stayed at the interface or in the bottom phase.

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Effect of media size in stirred ball mill grinding of coal

Cited by 98 publications

References 3 publications

Ultrafine Grinding in an Annular Ball Mill

Ultrafine Grinding in an Annular Ball Mill

A Review of Breakage Behavior in Fine Grinding by Stirred-Media Milling

Aqueous Biphase Extraction for Processing of Fine Coal

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