Publications and Presentations Related to the Szego Mill and Associated Process Technologies

To request a copy of a publication, please contact:
Dr. Olev Trass
Tel: 1-416-978-6901
Email: olev.trass@utoronto.ca

Refereed Publications

Trass, O., ‘The Szego Grinding Mill’, Proc. of  Intl. Symp. on Fine Particles Processing, Society of  Mining Engineers, AIME, Las Vegas, P. Somasundaran, Ed., Vol. I, 96-112 (1980).

Koka, V.R. and O. Trass, ‘The Novel Szego Grinding Mill’, Chemical Age of India, 33(6), 395-399 (1982).

Diosady, L.L., L.J. Rubin, N. Ting and O. Trass, ‘Rapid Extraction of Canola Oil’, J. Amer. Oil Chem. Soc., 60(9), 1658-1661 (1983).

Diosady, L.L., L/J. Rubin and O. Trass, ‘Solvent Grinding and Extraction of Rapeseed’, Proc. 6th World Rapeseed Congress, Paris, France, May, 1460-1465 (1983).

Gandolfi, E.A.J., G. Papachristodoulou and O. Trass, ‘Preparation of Coal-Slurry Fuels with the Szego Mill’, Powder Technology, 40, 269-282 (1984).

Papachristodoulou, G. and O. Trass, ‘Rheological Properties of Coal-oil Mixture Fuels’, Powder Technology, 40, 353-362 (1984).

Papachristodoulou, G. and O. Trass, ‘Grinding of Coal-oil Slurries with the Szego Mill’, Can. J. Chem. Eng., 63, 43-50 (1985).

Gotsis, C. and O. Trass, ‘Performance of the Szego Mill in Dry Grinding Coal and Wheat’, Powder Technology, 12, 287-294 (1985).

Koka, V.R. and O. Trass, ‘Analysis of the Kinetics of Coal Breakage by Wet Grinding in the Szego Mill’, Powder Technology, 43, 287-294 (1985).

Koka, V.R., G. Papachristodoulou and O. Trass, ‘Settling Stability of Coal Slurries Prepared by Wet Grinding in the Szego Mill’, Can. J. Chem. Eng., 63, 585-590 (1985).

Koka, V.R. and O. Trass, ‘Breakage Kinetics Using Multipass Grinding’, Particulate Science and Technology, 4, 379-394 (1986).

Trass, O. and V.R. Koka, ‘The Szego Mill: Its Applications in the Preparation of Coal-Slurry Fuels and Other Fine Materials’, Proc. Intl. Symp. on Recent Advances in Particulate Science and Technology, Madras, India, (Fine Particle Society), 135-147 (1987).

Koka, V.R., R. Hohmann and O. Trass, ‘Flow of Dry Particulates in the Szego Mill’, Powder Technology, 51(2), 189-200 (1987).

Koka, V.R. and O. Trass, ‘Determination of Breakage Parameters and Modelling of Coal Breakage in the Szego Mill’, Powder Technology, 51 (2), 201-214 (1987).

Papachristodoulou, G. and O. Trass, ‘Coal-Slurry Fuel Technology’, Can. J. Chem. Eng., 65, 177-201 (1987).

Koka, V.R. and O. Trass, ‘Estimation of Breakage Parameters in Grinding Operations Using a Direct Search Method’, Intl. J. Mineral Proc., 23, 137-150 (1988).

Wayman, M., S.R. Parekh, R.S. Parekh, O. Trass and E. Gandolfi, ‘Saccharification and Fermentation of Whole Barley Ground in the Szego Mill’, Starch/Starke, 40, 418-422 (1988).

Bajor, 0. and O. Trass, ‘Modified Oil Agglomeration Process for Coal Beneficiation I. Mineral Matter Liberation by Fine Grinding with the Szego Mill’, Can. J. Chem. Eng., 66, 282-285 (1988).

Trass, O. and O. Bajor, ‘Modified Oil Agglomeration Process for Coal Beneficiation II. Simultaneous Grinding and Oil Agglomeration’, Can. J. Chem. Eng., 66, 286-290 (1988).

Trass, O. and E.A.J. Gandolfi, ‘Fine Grinding of Mica and Other Filler Materials in the Szego Mill’, J. Powder & Bulk Solids Technol., 12, 11-17 (1988).

Austin, L.G., O. Trass, T.F. Dumm and V.R. Koka, ‘A Rapid Method for Determination of Changes in Shape of Comminuted Particles Using a Laser Diffractometer’, Part. Part. System Charact., 5, 13-15 (1988).

Trass, O. and E.A.J. Gandolfi, ‘Fine Grinding of Mica in the Szego Mill’, Powder Technology, 60, 3, 273-279 (1990).

Meffe, S., A. Perkson, E. Vasquez and O. Trass, ‘Coal Beneficiation for Slurry Fuel Preparation’, in Processing and Utilization of High Sulfur Coals IV, Dugan, P.R., Quigley, D.R. and Attia, Y.A., Eds., Elsevier, Amsterdam, 461- 490 (1991).

Perkson, A., S. Meffe and O. Trass, ‘Coal Beneficiation Using Methanol’, in Processing and Utilization of High Sulfur Coals V, Parekh, B.K. and Grappo, J.G., Eds., Elsevier, Amsterdam, 99-118 (1993).

McCracken, T.W. and O. Trass, ‘Modified Oil Agglomeration Process for Coal Beneficiation III. Grinding and Agglomeration Using Different Szego Mill Designs’, Can. J. Chem. Eng., 72, 375-379 (1994).

Trass, O., E.R. Vasquez, P.D. Campbell, E.A.J. Gandolfi and V.R. Koka, ‘Modified Oil Agglomeration Process for Coal Beneficiation IV. Pilot Plant Demonstration of the Simultaneous Grinding-Agglomeration Process’, Can. J. Chem. Eng., 72, 113-118 (1994).

Koka, V.R., G. Papachristodoulou and O. Trass, ‘Particle Shapes Produced by Comminution in the Szego Mill’, Part. Part. System Characterization, 12, 158-165 (1995).

Song, S., S. Haidari and O. Trass, ‘Flotation of Oil-Agglomerated Coal for Ash and Pyrite Removal’, Processing of Hydrophobic Minerals and Fine Coal, Laskowski, J.S. and Poling, G.W., Eds., Proc. 1st UBC-McGill Bi-annual Intern. Symp., CIMM, Vancouver, B.C., 223-234 (1995).

Trass, O., G.L. Papachristodoulou and E.A.J. Gandolfi, ‘Wet Grinding of Coal in the Szego Mill: Limiting Predictions and Experimental Results’, Coal Preparation, 16, 179-201 (1995).

Molder, T. and O. Trass, ‘Grinding of Waste Paper and Rice Hulls with the Szego Mill for Use as Plastics Fillers’, Intl. Jour. Mineral Processing (special comminution issue), 583-595 (1996).

Song, S. and O. Trass, ‘Floc Flotation of Prince Coal with Simultaneous Grinding and Hydrophobic Flocculation in a Szego Mill’, Fuel, 76, 839-844 (1997).

Anthony, E.J., A. MacKenzie, O. Trass, E. Gandolfi, A.P. Iribarne, J.V. Iribarne and S.M. Burwell, ‘Advanced Fluidized Bed Combustion Sorbent Reactivation Technology’, Industrial & Engineering Chemistry Research,  42, 1162-1173 (2003).

Delibas C. and O. Trass, ‘Refining Hemp Fibers for Papermaking’, Journal of Natural Fibers, 2, 59-68 (2005).

Anthony, E.J., L. Jia, A.P. Iribarne, G. Welford, J. Wang and O. Trass, ‘Calcium Sulphide in FBC Boilers and its Fate Using Liquid Water Reactivation’, Fuel, 85, 1871-1879 (2006).

Chen, X., E. Kuhn, W. Wang, S. Park, K. Flanegan, O. Trass, L. Tenlep, L. Tao and M.P. Tucker, ‘Comparison of Different Mechanical Refining Technologies on the Enzymatic Digestibility of Low Severity Acid Pretreated Corn Stover’, Bioresource Technology, 147, 401-408 (2013).

Gravelsins, R.J. and O. Trass, ‘Analysis of Grinding of Pelletized Wood Waste with the Szego Mill’, Powder Technology, 245, 189-198 (2013).

Kaljuvee, T., O. Trass, T. Pihu, A. Konist and R. Kuusik, ‘Activation and Reactivity of Estonian Oil Shale Cyclone Ash Towards SO2 Binding’, Journal of Thermal Analysis and Calorimetry, 121, 19-28 (2015).

Chen, X., W. Wang, P. Ciesielski, O. Trass, S. Park, L. Tao and M.P. Tucker, ‘Improving Sugar Yields and Reducing Enzyme Loadings in the Deacetylation and Mechanical Refining (DMR) Process through Multistage Disk and Szego Refining and Corresponding Techno-Economic Alalysis’, ACS Sustainable Chemistry & Engineering, 4, 324-333 (2016).

 

Reports

Trass, O., ‘Grinding of Wood Chips and Bark to Fine Powders’, ENFOR Project C-433 Report (1984).

Gandolfi, E.A.J., C. Delibas and O. Trass, ‘Improved Process for Fuel Ethanol Production’, General Comminution Inc. Report (2005).

Delibas, C., Report to CANMET Energy Technology Centre, Natural Resources Canada, Project File EA 9730G04-01, 36 pp. (2007).

Trass, O., ‘Use of the Szego Mill for Grinding/Processing Biomass’, 77 pp. (2012).


Textbook Chapters

Papachristodoulou, G. and O. Trass, ‘Rheological Properties of Ultrafine Coal-Oil Mixtures’, in Coal-Oil Mixture Combustion Technology, M.M. Schumacker, Ed., Noyes Data Corp., Park Ridge, N.J., 250-264 (1981).

Austin, L.G. and O. Trass, ‘Size Reduction of Solids: Crushing and Grinding Equipment’, Chapter 12 in Handbook of Powder Science and Technology, 2nd edn., M. Fayed and L. Otten, Eds., Chapman & Hall, N.Y., N.Y., 586-634 (1997).

Trass, O., ‘Process Feedstock Characterization and Preparation’ in Advances in Clean Hydrocarbon Fuel Processing, Woodhead Publishing, 5-53 (2011).

 

Conference Proceedings

Papachristodoulou, G. and O. Trass, ‘Grinding of Coal-in-Oil Slurries with the Szego Mill’, Proc. 2nd Intl. Symp. on Coal-Oil Mixture Combustion, Danvers, MA, 28 pp., U.S. Dept. of Energy, November (1979).

Papachristodoulou G. and O. Trass, ‘Rheological Properties of Ultrafine Coal-Oil Mixtures, Proc. 3rd Intl. Symp. on Coal-Oil Mixture Combustion, Orlando FL, 26 pp., U.S. Dept. of Energy (1981).

Trass, O., ‘Preparation of Coal-Oil Mixture Fuels’, Proc. 2nd World Congress of Chemical Engineering, Montreal, Quebec, Vol. II, 8 pp. (1981).

Trass, O., V.R. Koka, G. Papachristodoulou and E.R. Vasquez, ‘Grinding of Coal-Oil Slurries with the Szego Mill – Effect of Solids Concentration’, Proc. 4th Intl. Symp. on Coal Slurry Combustion, Orlando, FL, 15 pp., U.S. Dept. of Energy, May (1982).

Papachristodoulou, G., H. Boghossian and O. Trass, ‘Rheological Properties of Coal-Oil Mixtures. Effect of Particle Size Distribution’, 13 pp., May (1982).

Trass, O., G. Papachristodoulou, E.A.J. Gandolfi and J.D. Rouse, ‘Grinding of Coal Slurries with the Szego Mill’, A.C Taweel, A.M., Ed., Proc. Symp. Coal: Phoenix of the 80’5, 64th C.I.C. Ann. Mtg., Halifax, June 1981, Vol. I, 235-243 (1982).

Trass, O., ‘Preparation of Coal Slurry Fuels with the Szego Mill’, ACHEMA Congress, Frankfurt. Germany, sect. Advances and Developments in Mech. Eng., 4 pp., DECHEMA, June (1982).

Trass, O., ‘Mineral Matter Liberation by Fine Grinding of Coal Using the Szego Mill’, Proc. Coal-liquid Mixtures Workshop, Halifax, N.S., 24 pp., Centre for Energy Studies, TUNS, November (1982).

Koka, V.R. and O. Trass, ‘Analysis of the Kinetics of Coal Breakage by Wet Grinding in the Szego Mill’, Proc. 33rd Cdn. Chem. Eng. Conf., Toronto, Ontario, 6 pp., Cdn. Soc. for Chem. Eng., October (1983).

Trass, O. and Imanudin, ‘Grinding of Wood Chips and Bark to Fine Powders’, Proc. Sth Ann. Bioenergy R&D Seminar, Ottawa, Ontario, 5 pp., March (1984).

Trass, O. and O. Bajor, ‘Improved Oil Agglomeration Process for Coal Beneficiation’, Proc.6th Intl. Symp. on Coal Slurry Combustion and Technology, Orlando, FL, 639-648, June (1984).

Koka, V.R., G. Papachristodoulou and O. Trass, ‘Stability of Coal Slurries Prepared by Wet Grinding in the Szego Mill’, 939-950, June (1984).

Trass, O., O. Bajor, G. Papachristodoulou and T. McCracken, ‘Fine Coal Beneficiation by Improved Oil Agglomeration Process’, Proc. 1st Ann. Pittsburgh Coal Conf., Pittsburgh, PA, 470, September (1984).

Koka, V.R. and O. Trass, ‘Determination of Breakage Parameters and Modelling of Coal Breakage in the Szego Mill’, Proc. Intl. Symp. on Particulate and Multiphase Processes, Miami, FL, 22 pp, April (1985).

Trass, O., V.R. Koka and G. Papachristodoulou, ‘Beneficiation and Fine Grinding of Coal for Slurry Fuel Preparation’, Proc. 7th Intl. Symp. on Coal Slurry Comb. and Techn., New Orleans, LA, 240-255, May (1985).

Trass, O. and T.W. McCracken, ‘Grinding and Oil Agglomeration of Coal in the Szego Mill’, Proc. 4th Intl. Symp. on Agglomeration, Toronto, Ontario, 891-900, June (1985).

Trass, O. and G. Papachristodoulou, ‘Fine Grinding with the Szego Mill: An Update’, Proc. Cdn. Mineral Processors Mtg., Ottawa, Ontario, 14 pp., January (1986).

Trass, O., V.R. Koka and G. Papachristodoulou, ‘Particle Shapes Produced by Comminution in the Szego Mill’, Proc. 1st World Congress Particle Technology, Nuremberg, Germany, Vol. II, 501-514, April (1986).

Trass, O., G. Papachristodoulou and C.E. Capes, ‘Economical Coal Slurry Fuels by Oil Agglomeration’, Proc. 8th Intl. Symp. on Coal Slurry Fuel Preparation and Utilization, Orlando, FL, 232-240, May (1986).

Trass, O., E.A.J. Gandolfi, E. Vasquez and V.R. Koka, ‘Pilot Plant Demonstration of the New Simultaneous Grinding-Agglomeration Process for Fine Coal Beneficiation’, Proc. 12th Intl. Conf; on Slurry Technology, New Orleans, LA, 379-386, April (1987).

Gandolfi, E.A.J., V.R. Koka and O. Trass, ‘Fine Grinding Applications with the Szego Mill’, Proc. 12th Powder & Bulk Solids Conference/Exhibition, Rosemont, IL, 448-457 (1987).

Trass, O. and R. Gravelsins, ‘Fine Grinding of Wood Chips and Wood Wastes with the Szego Mill’, Proc. 6th Cdn. Bioenergy Seminar, Vancouver, B.C., 198-204 (1988).

Gravelsins, R. and O. Trass, ‘Modelling of Wood Grinding with the Szego Mill’, Proc. Chem. Eng. Grad. Student Conf., Kingston, Ont., 150-157 (1988).

Vasquez, E.R. and O. Trass, ‘Mechano-chemical Liquefaction of Coal’, Proc. Chem. Eng. Grad. Student Conf., Kingston, Ont., 292-299 (1988).

Gravelsins, R. and O. Trass, ‘Wet Grinding of Wood with the Szego Mill’, Proc. 7th Cdn. Bioenergy R&D Seminar, Ottawa, Ontario, 281-286, April (1989).

Trass, O. and E.R. VasqiJez, ‘Liquefaction of Coal with Simultaneous Grinding’, Proc. 15th Intl. Conf. on Coal Slurry Technology, Clearwater, FL, 337-349 (1990).

Trass, O., E.A.J. Gandolfi and E. Daugulis, ‘Development of an Integrated Fine-Grinding, Hydrolysis, Ethanol Fermentation Process’, Proc. Energy from Biomass and Wastes XIV Conference, Lake Buena Vista, FL; D.L. Klass, Ed., Inst. Gas Technology, Chicago, IL, 1207-1224 (1990).

Trass, O. and G.L. Papachristodoulou, ‘Dynamic Modelling of Wet Grinding in the Szego Mill’, Proceedings, 2nd World Congress Particle Technology, Kyoto, Japan, Vol. II, 471-479 (1990).

Vasquez, E.R. and O. Trass, ‘Non-Catalytic Reaction Models and Liquefaction of Coal With and Without Simultaneous Grinding’, Proceedings, 16th International Conference on Coal & Slurry Technologies, Clearwater, FL, 387 -398, April (1991).

Meffe, S., A. Perkson, and O. Trass, ‘Coal Beneficiation and Organic Sulfur Removal’, Proc. 17th Intl. Conf. on Coal Utilization & Slurry Technologies, Clearwater, FL, 245-256, April (1992).

Gandolfi, E.A.J., R. Leszczyniecki and O. Trass, ‘Wet Grinding of Coal in the Szego Mill’, Proc. 18th Intl. Techn. Conf. on Coal Utilization & Fuel Systems, Clearwater, FL, 853-865 (1993).

Raghem-Moayed, A. and O. Trass, ‘A Rapid Method for Estimating Breakage Parameters Applied to the Comminution of Brittle Materials’, Proc. 1st Intl. Particle Technology Forum, Denver, CO, 129-134, August (1994).

Molder, T. and O. Trass, ‘Grinding of Waste Paper and Rice Hulls with the Szego Mill for Use as Plastics Fillers’, Proc. 8th European Symposium on Comminution, Stockholm, Sweden, 8 pp., May (1994).

Trass, O. and E.R. Vasquez, ‘Liquefaction of Coal With and Without Simultaneous Grinding’, Proc.44th Cdn. Chem. Eng. Conf., Calgary, 509-510, October (1994).

Song, S., O. Trass and Z. Wang, ‘Natural Hydrophobic Flocculation of Fine Coal Particles in Aqueous Solution’, Proc. 11th Ann. Intl. Pittsburgh Coal Conference, S.H. Chiang, Ed. Pittsburgh, PA, 834-839 (1994).

Molder, T. and O. Trass, ‘Efficient Grinding of Cellulosic Fibres for Use as Plastics Fillers’, Proc. 1st Intl. Conf. on Composite Materials and Energy, Enercomp ‘85, Montreal, Quebec, Technomic Publ. Co. Inc., Lancaster, PA, 309-316 (1995).

Song, S., A. Perkson and O. Trass, ‘Flotation of Oil-Agglomerated Coal for Ash and Pyrite Removal – Simultaneous Grinding and Agglomeration’, Proc. 21st Intl. Techn. Conf. on Coal Utilization & Fuel Systems, 339-351, March (1996).

Trass, O., ‘Use of the Szego Mill in Fine-Grinding of Coal, Industrial Minerals and Waste Materials’, Proc. CHISA ’96, 12th Intl. Congress of Chemical and Process Engineering (D6.4), Praha, Czech Republic, 10 pp., August (1996).

Trass, O., ‘Beneficiated Coal Slurry Fuels – Overview and Prospects’, Proc. 14th Intl. Pittsburgh Coal Conf., Taiyuan, Shanxi, China, 15 pp., Sept. 23-27 (1997).

Trass, O., ‘Coal Slurry Fuels: where are we and where should we go?’, Proc. 26th IntI. Techn. Conf. on Coal Utilization & Fuel Systems, Clearwater, FL., 297-309, Mar. 5-8 (2001).

Trass, O., E.A.J. Gandolfi and E.J. Anthony, ‘Reactivation of Fluidized Bed Combustor Ashes’, Proc. 27th IntI. Techn. Conf. on Coal Utilization & Fuel Systems, Clearwater, FL, 921-930, Mar. 4-7 (2002).

Trass, O., C. Delibas and D. Carruthers, ‘Grinding and Refining Textile Fibres for Papermaking’, Proc. Paperweek IntI. (P APTAC), Montreal, Quebec, 6 pp., Jan. 27-30 (2003).

Trass, O., ‘Reactivation of Fluidized Bed Combustor Ashes – Economic Evaluation and Implementation’, Proc. 29th Intl. Techn. Conf. on Coal Utilization & Fuel Systems, Clearwater, FL, 12 pp., Apr. 18-22 (2004).

Trass, O., ‘Developments in Grinding Technology’, Proc. Intl. Sem. on Chem. Eng. And Sci. for Human Welfare, Waseda University, Tokyo, Japan, IV, 1-26, March 11 (2005).

Trass, 0., E.A.J. Gandolfi, E.J. Anthony and M. Maryamchik, ‘Reactivation of Fluidized Bed Combustor Ashes: Economic Evaluation and Implementation’, Proc. 18th IntI. Techn. Conf. on Fluidized Bed Combustion, Toronto, Ontario, Canada, 13 pp., May 22-25 (2005).

Trass, O., C. Delibas and D. Carruthers, ‘Grinding and Refining Textile Fibers for Papermaking’, Paperweek Intl. (PAPTAC), Montreal, Quebec, 5 pp. (2005).

Mackenzie, A. and E.J. Anthony, ‘Economic Case Study of Ash Reactivation for a Generic 150MWe Canadian CFB’, Proc. 19th Intl. Conf. on FBC, Vienna, 9 pp. (2006).

Trass, O. and E. Vasquez, ‘Beneficiation of Coal for Slurry Fuel Preparation’, Proc. 33rd Intl. Techn. Conf. On Clean Coal and Fuel Systems, Clearwater, FL. 12 pp. (2008).

Trass, O., C. Delibas and E.J. Anthony, ‘Efficient Reactivation of Fluidized Bed Combustor Ashes: Test Results from a 35 MWt Utility Boiler’, Proc. 9th Intl. Conf. on Circulating Fluidized Beds, CFB-9, Hamburg, Germany, 869-874 (2008).

Zarei, A., M. Sain and O. Trass, ‘Characterization of Szego-milled Hemp Fibers’, Proc. 11th Intl. Conf. on Biocomposites: Transition to Green Materials, Toronto, Ontario, 13 pp. (2010).

Trass, O. and M. McLaren, ‘Preparation of Various Fuels for the Non-thermal Plasmatron Reactor-gasifier Using the Szego Mill’, Proc. 37th Intl. Techn. Conf. on Clean Coal and Fuel Systems, Clearwater, FL. 12 pp. (2012).

Trass, O. and M. McLaren, ‘Revisiting Selective Oil Agglomeration for Ecological Benefits’, Proc. 38th Intl. Techn. Conf. On Clean Coal and Fuel Systems, Clearwater, FL. 12 pp. (2013).

Trass, O. and M. McLaren, ‘Coal Beneficiation by Selective Oil Agglomeration Using Bio-oils’, Proc. 39th Intl. Techn. Conf. on Clean Coal and Fuel Systems, Clearwater, FL. 12 pp. (2014).

Trass, O. ‘Efficient Reactivation of Fluidized Bed Combustor Ashes: A Simplified Procedure’, Proc. 41st Intl. Techn. Conf. on Clean Coal and Fuel Systems, Clearwater, FL. 12 pp. (2016).

 

Conference Presentations (not listed under Proceedings)

Trass, O., ‘Development of the Szego Mill for Coal Grinding’, Engineering Foundation Conference on Advanced Coal Preparation, Henniker, N.H., August (1981).

Trass, O., E.A.J. Gandolfi and G.L. Papachristodoulou, ‘Performance and Scale-up of the Szego Mill for Coal-Slurry Fuels Preparation’, at the 5th International Symposium on Coal Slurry Combustion and Technology, Tampa, Florida, U.S. Department of Energy, April (1983).

Trass, O. and T. Lustvee, ‘Preparation of Aluminum Pastes with the Szego Mill’, Pacific Region Meeting, Fine Particle Society , Honolulu, Hawaii, August (1983).

Trass, O. and Imanudin, ‘Grinding of Wood Chips and Bark to Fine Powders’, 34th Canadian Chemical Engineering Conference, Quebec City , Quebec, October (1984).

Trass, O. and G. Papachristodoulou, ‘The Szego Mill’, German Process Engineering Workshop on Comminution and Agglomeration (V.D.I.), Moenchengladbach, West Germany, April (1985).

Tar, G.C., L.L. Diosady and O. Trass, ‘Semi Pilot Scale Solvent Grinding of Canola’, Annual Meeting, Canadian Institute of Food Science and Technology, Toronto, Ontario, June (1985).

Trass, O., G. Papachristodoulou and T.W. McCracken, ‘Improved Oil Agglomeration Process for Coal Beneficiation: Effect of Main Variables’, Engineering Foundation Conference on Science and Technology of Processing Fine Coal, Henniker, N.H., August (1985).

Trass, O., P.O. Campbell and G. Papachristodoulou, ‘Ash Liberation and Coal Cleaning by Oil Agglomeration in the Szego Mill’, 5th International Workshop on Coal-Liquid Fuels Technology (Technical University of Nova Scotia), Halifax, N.S., October (1985).

Trass, O. and G. Papachristodoulou, ‘Fine Grinding with the Szego Mill: An Update’, Engineering Foundation Conference on Recent Developments in Comminution, Honolulu, Hawaii, December (1985).

Gravelsins, R.J. and O. Trass, ‘Development and Modelling of Wood Grinding with the Szego Mill, 36th Canadian Chemical Engineering Conference, Sarnia, October (1986).

Trass, O., P.D. Campbell and G. Papachristodoulou, ‘Fine Grinding and Beneficiation of Coal by Improved Oil Agglomeration Process’, AIChE Annual Meeting, Miami Beach, Florida, November (1986).

Koka, V.R. and O. Trass, ‘A Pilot Plant Demonstration of the Simultaneous Grinding/ Agglomeration Process’, Eng. Foundn. Conf., Santa Barbara, California, January (1987).

Trass, O., E.A.J. Gandolfi and L.J. Keller, ‘Preparation of Coal Slurry Fuel from Coal-oil Agglomerates’, at the 13th Int’l. Conf. on Coal & Slurry Technology, Denver, CO, April 12-15 (1988).

Trass, O., E. Edusei and E.A.J. Gandolfi, ‘Wet Grinding of Coal and Limestone with the Szego Mill at High Solids Concentrations’, 14th Intl. Conf. on Coal Slurry Technology, Clearwater, FL, April 24-27 (1989).

Trass, O., ‘Cooperative Research in Coal Beneficiation – An Example of University-Industry Collaboration’, at the 7th Cdn. Conf. on Eng. Educ., Toronto, Ontario, June (1990).

Trass, O., M. Madden and B. Etkin, ‘Development of the EPS Aerodynamic Particle Separator’, 73rd Can. Chem. Eng. Conf., Halifax, N.S., July (1990).

Trass, O., ‘Simultaneous Grinding and Oil Agglomeration of Coal Followed by Chemical Cleaning’, Eng. Found. Conf. on Advanced Fine Coal Cleaning, Palm Coast, FL, Dec. (1990).

Trass, O., ‘Comminution of Paper and Wood Wastes with the Szego Mill’, Workshop on Identification of R&D Challenges in the Recycling of Paper, Plastic and Wood Waste into Composites, Toronto, Feb. 11 (1991).

Trass, O. and M. Madden, ‘Size Separation of Fine Particles with the EPS Aerodynamic Classifier’, 42nd Can. Chem. Eng. Conf., Toronto, October (1992).

Molder, T. and O. Trass, ‘Fibre Preparation for K-mixer Process Using the Szego Mill’, Wood Fiber-Plastic Composites Conf., Madison, WI, May (1993).

Trass, O. and T. Molder, ‘Grinding of Waste Paper with the Szego Mill for use as Plastics Filler’, 43rd Can. Chem. Eng. Conf., Ottawa, October (1993).

Gandolfi, E.A.J., G. Papachristodoulou and O. Trass, ‘Wet Grinding of Coal in the Szego Mill: Limiting Predictions and Experimental Results’, 19th Intl. Tech. Conf. on Coal Utilization & Fuel Systems, Clearwater, FL, March (1994).

Trass, O., J. Pim and C. Delibas, ‘Energy Requirements for Chemimechanical Pulping of Wood Chips with the Szego Mill’, 51st Cdn. Chem. Eng. Conf., Halifax, N.S. Oct. 14-17 (2001).

Delibas, C., J. Pirn and O. Trass, ‘Pulping Conditions and Fiber Properties in Chemimechanical Pulping with the Szego Mill’, 51st Cdn. Chem. Eng. Conf., Halifax, N.S., Oct. 14-17 (2001).

Trass, O., R.J. Gravelsins and E.A.J. Gandolfi, ‘Co-firing of Wet and Dry Biomass’, 53rd Cdn. Chem. Eng. Conf., Hamilton, Ontario, Oct. 26-29 (2003).

Trass, O. and C. Delibas, ‘Grinding of Hemp, Used Textile Fibres and Flax with the Szego Mill’, Paperweek Intl. (PAPTAC), Montreal, Quebec, Feb. 7-10 (2005).

Trass, O., ‘Clean Coal Technologies: Overview and Opportunities’, 56th Cdn. Chem.Eng. Conf., Sherbrooke, Quebec, Oct.15-18 (2006).

Trass, O., ‘Use of the Szego Mill for Wet or Dry Biomass Processing’, International Biomass Conference & Expo, Minneapolis, April 10-12, 2017.

 

Patents

Trass, O., ‘Multiple Stage Comminution Device’, Canadian Patent No. 1,134,336 (1982). Issued also in the following countries: Belgium, Finland, France,  Germany, Italy, Netherlands, South Africa, Sweden, Germany, United Kingdom (1981-1986), and in Japan (1989). Commercial use started in 1983. Assigned to General Comminution Inc. Equipment is described which allows comminution of material in multiple stages, built into one grinding cylinder, with different designs of the helically grooved grinding rollers in the different stages. Provision is made for variable transport capability in and between the stages so as to vary residence time and grinding characteristics. 15 claims.

Trass, O., ‘Method.of Separating Solids by Simultaneous Comminution and Agglomeration’. U.S. Patent No. 4,730,787 (1988). Canadian Patent No.  1,249,986 (1989). Issued also in Australia (1989), Belgium, France, Germany, India, Italy, Netherlands, Sweden, and United Kingdom (1990), pending in Japan.  Assigned to the University of Toronto. A process is provided for the separation of a solid into its constituent lyophobic and lyophilic components by comminution and agglomeration in liquids to which the two components are respectively lyophobic and lyophilic. The process has particular application in coal beneficiation wherein ash particles are liberated into a water phase and coal particles are agglomerated with oil. The operations of comminution and agglomeration are combined in a single step by performing the process in a mill having positive transport capability. 27 claims.

Trass, O., E. Gandolfi and E.J. Anthony, ‘Ash Reactivation’, U.S. Patent No. 7,323,021 B2 (2008).