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The effect of chemicals on the rheology of highly loaded coal water slurries (CWS)

Slaczka A., Wasilczyk A.

Physicochemical Problems of Mineral Processing

2012

Vol. 48, iss. 1

141-148

In this study the influence of chosen detergents on the rheology of highly loaded coal-water slurries (60%wt) made up from coals of differents degree of carbonization from steam coal rank of 31.2 through 33 to coking coal rank of 35.1 according to Polish Standards were tested. In the experiments the nonionic types of chemicals - Rokwinol 60 (polyoxyethylated sorbite oleate, C64H124026), Rokanol LO18 (RO (CH2CH2O)n H, where R - alkyl radical consisting of 16 to 18 carbon atoms in the carbon chain and "n" is around 18), manufactured by Chemical Factory "ROKITA " in Brzeg Dolny, Poland as well as anionic sodium lignosulphonate LSP, a by-product from cellulose production, were used. The detergents used were of a commercial purity. They were chosen taking into account the structure of molecules. Molecules of the surfactants used differ in space structure. Rokanol LO18 has a linear structure, Rokwinol 60 as a derivative of sorbitol has a branched structure whereas sodium lignosulphonate has complicated space structure. The price and accessibility of the detergents used were also considered. The test results clearly showed that the rheological properties of the CWS depend significantly on both the type of coal and the type of surfactant. The slurries prepared in this study exhibit pseudoplastic and dilatant properties. The same surfactant, depending on the type of coal, may give the CWS of different rheological behaviour. It was supposed that besides of electrostatic and dispersing forces the steric affect plays a significant role in the CWSs fluidity. The coal-water slurries, made up from all tested coals without addition of detergents, had consistency of dense mud and their viscosities were not measured.

Zawiesinowe paliwa węglowo-wodne : wpływ detergentów na stan energetyczny powierzchni ziaren węglowych

Ślączka A., Piszczyński Z., Polo F. G.

Inżynieria Mineralna

2005

R. 6, nr 2

13-21

Przebadano wpływ wybranych detergentów na energię powierzchniową ziaren węgla w układzie węgiel-woda-dodatki modyfikujące. Do przygotowania zawiesin użyto polskiego węgla typu 34.2. Jako modyfikatory zastosowano niejonowe środki powierzchniowo czynne produkcji Zakładów Chemicznych "ROKITA" S.A. w Brzegu Dolnym - Rokwinol 60 będący polioksyetylowanym oleinianem sorbitanu o wzorze sumarycznym C64H124O26 i Rokanol ŁO18, który jest eterem polioksyetylenoglikolowym nienasyconego alkoholu tłuszczowego o wzorze chemicznym: RO(CH2CH2O)nH, gdzie: R - rodnik węglowodorowy zawierający 16 do 18 atomów węgla w łańcuchu, a "n" wynosi średnio 18. Wyznaczenie energii powierzchniowej węgla dokonano w oparciu o testy flotacji powierzchniowej. Stwierdzono, że Rokwinol 60 wykazuje większe zdolności obniżania energii powierzchniowej ziaren węglowych w porównaniu z Rokanolem ŁOI8.

The influence of chosen detergents on the surface energy of coal grains in the system coal-water-additives were tested using the film flotation method. The coal used in experiments was coking coal type of 34.2 according to the Polish Standards. As additives nonionic surfactants Rokwinol 60 and Rokanol ŁO18 manufactured by the "ROKITA" Chemical Factory in Brzeg Dolny, Poland were used. Rokwinol 60 is the polyoksyethylated sorbite oleate of the formula C64H124O26, whereas Rokanol ŁO18 is polyoxyethylene (18) tallow alcohol of the formula RO(CH2CH2O)nH, where R - alkyl radical, consists of 16 to 18 carbon atoms in the carbon chain and "n" is equal to around 8. It was stated that Rokwinol 60 causes greater decrease in surface energy of the coal used in comparison with Rokanol ŁOI8.