Dear David Parkhurst, I thank you for today's he telephone conversation. I hope this e-mail will set the communication between us. I need a copy of your report: "User's Guide to Phreeqc (Version 2")", by David L. Parkhurst and C. J.. Appelo, Water-Resources Investigations Report 99-4259, USGS, Denver, Colorado (1999) and the most recent version of the computer program to calculate equilibrium composition in aquatic systems. We are interested in predicting composition of the release water recovered from the oil sands tailings (originally 20 % solids, of which 50 % fines, i.e. smaller than 44 micron). After chemically treating the oil sands tailings with Ca(OH)2 and CO2, the sludge (tailings) is thickened using a suitable thickener. Both the chemical treatment and the thickener are invented by Apex Engineering Inc. of Edmonton, Alberta, Canada. The release water composition is an important element of the whole process. This water has to be treated (with CO2 and/or Na2CO3) so that its Ca2+ ion concentration must be reduced to an acceptable level. Ca2+ ions in the water is a problem, because it reduces the bitumen extraction efficiency of the extraction (hot water or low energy) process. I will provide you more information about the oil sands operation, if needed. I think, this much of information would give you some feelings about the importance of your help. Your cooperation in this matter would be greatly appreciated. Sincerely your. Baki Ozum, P.Eng.,Ph.D. Apex Engineering Inc. 234 Westridge Road Edmonton, Alberta T5T 1C1 Canada Ph. 780-481-8574 Fx: 780-481-0988
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