Ultrafine Grinding in an Annular Ball Mill

Orumwense, Osawaru A.; Forssberg, Eric

doi:10.14356/kona.1990020

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…Generally, milling of these minerals can be performed in the conventional tumbling, impact, stirred ball, jet and vibration mills. However, in the fine size range, the economic and process considerations show the last three milling methods to be the most versatile, depending on the product and use [3]. Due to higher power density (density of the energy absorbed by the particles) and better grinding efficiency, high-speed stirred ball mills are considered as an interesting alternative to conventional tumbling mills and vibratory mills for fine grinding and delamination processes in the minerals industry [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…The aim of this study is to determine the operating conditions for the dry grinding of talc to micro fine sizes using a laboratory vertical stirred ball mill. specific density of talc is 2.78 g/cm 3 . The typical size distribution of the feed sample is presented in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…The typical size distribution of the feed sample is presented in Figure 1. Alumina balls with diameters 2.5-3.5 mm mixtures (33% of each) a density of 3.6 g/cm 3 were used as the grinding media.…”

Section: Introductionmentioning

confidence: 99%

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Dry grinding of talc in a stirred ball mill

Çayırlı

2016

E3S Web Conf.

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ÖZ Karıştırmalı bilyalı değirmende (attritör), mikron altı ve nano boyutlu tanelerin öğütmede sergilediği davranış ve elde edilebilir en küçük tane boyutu süspansiyonun kararlılığından oldukça fazla etkilenmektedir. Bu çalışma kapsamında, yaş öğütmede talkın süspansiyon kararlılığı pH ölçümü ile araştırılmıştır. Elde edilen veriler doğrultusunda, karıştırmalı bilyalı değirmende belli bir süre sonunda boyutta çok fazla bir küçülme olmadığı ve ortalama ürün boyutunun (d 50) arttığı gözlenmiştir. Bunun asıl sebebi olarak, mikron altı boyutta partikül üretiminin daha çok tane-tane etkileşimine yol açtığı ve sonuç olarak süspansiyonun pH değerinin zamanla azaldığı tespit edilmiştir. Yapılan deneylerde beş farklı pH değerinin (5-6,5-8-9,5 ve 11) etkisi araştırılmış ve sonuç olarak süspansiyonun kararlılığının öğütme süresi ile değiştiği ve dolayısıyla süspansiyonun kararlılığının boyut küçültmeyi de etkilediği tespit edilmiştir. ABSTRACT Grinding behaviour of submicron and nanoparticles in stirred media mill (attritor) and the minimum achievable particle size are pretty much influenced by the suspension stability. In the present work, suspension stability of talc in a wet milling process was investigated by measuring pH. It was found that after a certain time in an attritor mill, there is no more size reduction and the average product particle size (d 50) increases. One of the main reasons is that the production of submicron particles causes more particle-particle interactions and consequently pH of the suspension decreases with grinding time. The effect of pH was investigated by the experiments carried out at five pH values (5-6.5-8-9.5 and 11). It was determined that the suspension stability was found to be affected by grinding time and hence, the size reduction was affected by pH of the suspension.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dry grinding of talc in a stirred ball mill

Çayırlı

2016

E3S Web Conf.

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“…It is essential to retain or enhance the fundamental features of the muscovite through the grinding process. Generally, muscovite grinding has been performed in impact, stirred, jet, and planetary mills, either dry or wet (Orumwense and Forssberg, 1990). Considering the importance of water resources and the need to use them more efficiently, dry grinding has become increasingly important, and studies in the related literature are at an early stage.…”

Section: Introductionmentioning

confidence: 99%

The effect of liquid grinding aids on the dry fine grinding of muscovite

Bozkurt,

Cayirli,

Gokcen

et al. 2023

Physicochem. Probl. Miner. Process.

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This paper investigates the production of a micronized muscovite to a target product size of d50~15 µm with a minimum energy consumption to suit the product requirements of the paint industry by a dry grinding process in a laboratory-scale vertical stirred ball mill. A series of batch dry grinding tests were conducted without and with two commonly used industrial liquid grinding aids, ethylene glycol (EG, C2H6O2) and triethanolamine (TEA, C6H15NO3). The results were evaluated based on particle size distribution (PSD), specific energy consumption, span value, and aspect ratio. The results showed that using liquid grinding aids resulted in a finer PSD, lower specific energy consumption, a narrower size distribution, lower span values, and a higher aspect ratio, which meant better delamination and improved grinding efficiency to that of no grinding aid. The interaction between grinding aids and ground muscovite surfaces was investigated by Fourier Transform Infrared Spectroscopy (FTIR). FTIR measurements revealed that EG and TEA were physically adsorbed on muscovite surfaces. Scanning Electron Microscopy (SEM) was also employed to determine differences between ground muscovite surfaces with and without grinding aids. SEM images indicated that grinding aids could prevent the agglomeration of ground muscovite particles while improving delamination. Adding grinding aids led to a decrease in muscovite agglomeration and an improvement in lamination owing to the adsorption of grinding aids on the particle surfaces.

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“…As the motor thrust and the relative motion of the rubbing mill-balls produce shears high enough to overcome the inter-agglomerate bonding upon milling, de-agglomeration occurs and this dispenses the thick liquid slurry into a low viscous one [8,9]. Among the process variables involved in the milling process, factors such as material and size/shape of the grinding medium, milling time and filling ratio of grinding balls with respect to the overall powder loading and mill-pot volume have all been shown critical to the milling efficacy and the milled particle-size distribution [1,[10][11][12]. Contaminations arising from the milling operation also become a concern particularly for long-time milling.…”

Section: Introductionmentioning

confidence: 99%