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Practical guidelines for predicting the proper conditions of high-energy mixing in a planetary ball mill towards powder flow improvement

Leś Karolina M., Opaliński Ireneusz

Chemical and Process Engineering

2022

Vol. 43, nr 3

419-–433

In this work Response Surface Methodology and Central Composite Rotatable Design were applied to find high-energy mixing process parameters enabling flow properties of highly cohesive Disulfiram powder to be improved. Experiments were conducted in a planetary ball mill. The response functions were created for an angle of repose and compressibility index as measures of powder flowability. To accomplish an optimisation procedure of mixing process parameters according to a desirability function approach, the results obtained earlier for potato starch, as another cohesive coarse powder, were also employed. Coupling these results with those achieved in a previous work, it was possible to develop some guidelines of practical importance allowing mixing conditions to be predicted towards flow improvement of fine and coarse powders.

Prospective Application of Response Surface Methodology for Predicting High-Energy Mixing Process Conditions towards Fine Powders Flow Improvement

Leś Karolina, Opaliński Ireneusz

Advances in Science and Technology. Research Journal

2021

Vol. 15, no 1

134--143

Planetary ball mill was proposed as an intensive high-energy mixer to obtain flowability improvement of industrially exploited, cohesive and finely comminuted powders via dry coating. Response surface methodology (RSM) coupled with central composite rotatable design (CCRD) was applied as an effective method for the prediction of high-energy mixing conditions. The use of this procedure allows identifying relatively narrow ranges of high-energy mixing parameters (rotating speed of planetary ball mill and mixing time) and the amount of additives used (nanosilica and isopropyl alcohol) providing substantial improvement of the flowability of Aluminium hydroxide (Apyral) and Calcium carbonate powders. In order to find the optimal values of the process parameters, enabling to obtain the lowest values of flowability indices (angle of repose, compressibility index), the desirability function approach was applied. The obtained results may be a basis for developing a general routine allowing mixing parameters to be successfully predicted regarding some physical properties of powders only with no experiments needed.

Modyfikacja mechanochemiczna kompozytów z polifluorku winylidenu jako składników elektrolitów akumulatorów litowo-jonowych

Kozdra S., Opaliński I., Leś K., Chauveau J.

Inżynieria i Aparatura Chemiczna

2016

Nr 6

233--236

PVDF modyfikowano metodą mieszania wysokoenergetycznego w młynie planetarno-kulowym z dodatkiem Li3N, LiNH2 i Aerosilu. Przygotowano folie kompozytów polimerowych. Analizowano strukturę chemiczną i krystaliczną folii metodą FTIR oraz SAXS. Zmierzono przewodnictwo właściwe techniką EIS. Wyniki wskazują na korzystny wpływ modyfikacji mechanochemicznej na właściwości chemiczne i elektrochemiczne kompozytów, jako potencjalnych składników elektrolitów stałych akumulatorów litowo-jonowych.

PVDF powder was modified using high energy mixing in a planetary ball mill with Li3N, LiNH2 and Aerosil additives. Composite membranes were prepared. Chemical and crystal structure were analysed by FTIR and SAXS methods. Ionic conductivity was measured by EIS. The results suggest positive influence of mechanochemical modification on electrochemical properties of composites as a potential electrolyte component for rechargeable lithium ion batteries.