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

Cayirli Serkan, Gokcen Hasan Serkan, Bozkurt Volkan, Ucbas Yasar

Physicochemical Problems of Mineral Processing

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2023

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Vol. 59, iss. 2

art. no. 165854

EN

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.

2

Influences of operating parameters on dry ball mill performance

Cayirli S.

Physicochemical Problems of Mineral Processing

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2018

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Vol. 54, iss. 3

751--762

EN

The paper is aimed to investigate the influence of operating parameters on dry fine grinding of calcite in a laboratory scale conventional ball mill. Within the context, the influence of operating parameters such as mill speed, ball filling ratio, ball size distribution, powder filling ratio, grinding aid dosage and grinding time were studied. The results of grinding tests were evaluated based on the product particle size (d50, d80) and surface area (m2/kg). As a result of this study, optimum grinding test conditions determined to be 70% of Nc, J=0.35 for ball filling ratio, 40 mm (10%), 32 mm (10%), 20 mm (40%), 12 mm (40%) for ball size distribution, fc=0.125 for powder filling ratio, 2000 g/Mg for grinding aid dosage and 60 min for grinding time. After determining optimum grinding conditions, the influence of grinding aid dosage on powder fluidity was determined. The use of 2000 g/Mg grinding aid dosage had a greater fluidizing effect compared to the other dosages and no aid condition (0 g/Mg). The influence of grinding aid on dry fine grinding of calcite was also examined by Fourier Transform Infrared Spectroscopy (FTIR). FTIR measurements indicated that grinding aid was adsorbed on the ground calcite particles surface.

3

Środki ułatwiające mielenie w produkcji cementu

Bensted J., Smith J. R.

Cement Wapno Beton

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2009

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R. 14/76, nr 4

179-188

PL

Środki ułatwiające mielenie oddziaływują na powierzchnie różnych faz obecnych w cemencie z utworzeniem warstewki, która zapobiega aglomeracji cząstek cementu. Korzyści ze stosowania tych środków polegają na skróceniu czasu przebywania materiału w młynie, zmniejszenie oklejania mielników cementem, zwiększenie sprawności separatorów i poprawę zdolności do "płynięcia" cementu w trakcie transportu i załadunku do cystern. Środki ułatwiające mielenie są z reguły stosowane do wytwarzania cementów wszystkich rodzajów, a ostatnio coraz częściej do produkcji cementów wiertniczych.

EN

Grinding aids function by interacting with the surfaces of the different phases present in cements, by effectively forming a film that prevents significant agglomeration of the cement particles. The benefits of grinding aids include lower mill retention times, reduced ball coatings within the grinding mills, improved separator efficiency and improved cement flow properties during handling, conveyance and transportation. Grinding aids are normally used in the manufacture of construction cements (Portland, slag, pozzolanic, composite, decorative and high alumina) and increasingly so in oilwell cements.