Web Updates (latest update:
Feb. 13, 2008)
For the newest changes and additions of the Post Mixing website check Web
Updates.
Main Phone Number
Our new phone number is +1 (585) 507-4318. Our old number +1 (585)
383-8788 has been converted to out Fax line. Please see Contact
Us for more information.
This section of our website is getting our attention now. Check the Mixing
Forum and for update news here, including mixing
definitions, nomenclature, Static Mixers,
impeller characteristics and
designs, tank shapes, baffle
descriptions, heat transfer elements (coils, plates,
jackets), scale-up,
CFD and CFM, conferences and
meetings, and mixing
company reports.
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Web Highlights
Upcoming Conferences
Nothing scheduled at this time. If you know of a conference that we
should be at, please
let us know.
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News
Course ChE 621 has now been extended to include mechanical engineers with
PME 621. See the description below for more details. This course will
now consist of 14 lessons and include a lesson on solid-solid mixing.
This course (ChE
621) was part of the Chemical Engineering Department's graduate course on
Pharmaceutical Engineering. The lessons were given once per week, with
homework, quizzes, mid-term and final exams. Some undergraduates also
took the course. The 15 week course included 13 lessons on mixing.
The successful students earned 3 credits toward their credentials.
- June 17-22, 2007: Tom and Keith presented "Optimization of Mixing
in Agitated Horizontal Tank Reactors" in Session 9 to honor Jim
Oldshue of the NAMF Mixing XXI Conference in Park City, Utah.
We presented this paper co-authored with
Darryn McClelland
(Manager Metallurgy, Lane Xang
Minerals Limited) and
Herman Pieterse (Principal, PIETERSECONSULTING).
Although the client was mostly interested in a reduction of the abrasion to
the impellers and autoclave walls and internals, we were also interested in
providing the mixing world with information on various Proximity Factors for
horizontal tanks. These are well known for vertical tanks, but
non-existent for horizontal tanks.
Using CFD as our laboratory, we determined flow velocities, shear rates,
vorticity, flow number, Nq, and power number, Np, as a function of
proximity (PF for Np and Nq), the effect of Reynolds Number, Re on Np and Nq,
effect of baffles on Np and Nq or Baffling Factor, effect of blade number on
Np and Nq, effect of D/T on Np and Nq, and the effect of chamber length on Np
and Nq. We also looked at the effect that two impellers had upon each
other in a long chamber. There can be some serious and significant
interference.
We used Dr. James Oldshue's original hot-film anemometry work of the 1950s
to validate the CFD by constructing the same experimental set-up as Jim had
used and compared local velocities and directions on a 6 inch Rushton Turbine
in a 17.5 inch diameter tank. We were also able to validate the local
velocities using Laser data presented in the NAMF Handbook on page 67.
The agreement between the AcuSolve CFD
and these experiments was amazing.
We were able to test and confirm some of these effects on the Gold
Autoclave of Lane Xang Minerals Limited
(Laos), which has a tank diameter of 3.524 m and a chamber length of 3.6 to
7.3 meters. The result of this test increased the lifetime of the
impellers by more than a factor 2.
- November 16-21, 2003: Tom and Keith presented "Process
Intensifier: Optimization using CFD" in the Industrial Mixing
and Scale-Up/Scale-Down Issues
session of the AIChE 2003 Annual Meeting
in San Francisco.
Tom and Keith presented this paper to a room so full that there was 2
rows of people standing in the back. Obviously, process
intensification is on the minds of many people not just scientists in the
mixing community. The report
we have here has much more detail than we presented at the AIChE Annual
Meeting. Keith demonstrated the superiority of the AcuSolve
CFD program we used, while Tom
described the results and comparison of 4 different mixing devices in a pipe
or pipeline.
-
August 24-27, 2003: Presented "Scale-up
of Pumpers & Mixers for Solvent Extraction" at HYDRO
2003:
Hydrometallurgy 2003: 5th International Symposium in Honor of
Professor Ian Ritchie in Vancouver
Tom presented this paper just 3 hours
after being stung by a wasp on the upper lip. He demonstrated how to
scale-up pumpers and mixers for mineral solvent extraction and he also showed
how AcuSolve can be used to determine the flow
number (Nq), head number (Nh), power number (Np) and pressure drops (delta p)
throughout an SX-system.
-
-
June 15-20, 2003: NAMF
Mixing Conference, Mixing XIX, in Lake Placid, NY
Tom attended this conference. A small summary of each talk
will be added to this site in about 3 weeks (about the 1st-2nd week in
July). It was a great conference.
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Recent Publications
Dr. Post collaborated with Tim Dodge and Peter Lundqvist of Genencor
International on the following presentation at the ACS National Meeting, which
was held in New Orleans from March 23-27, 2003. The paper was presented by
Tim Dodge.
- Simulation of Large Scale Environments in the
Laboratory, T. Dodge, P. Lundqvist, T. Post, ACS 225th National
Meeting, New Orleans, March 23-27, 2003, Oral Presentation
Dr. Post gave an oral presentation of the following paper at the Mineral
Processing Plant Design, Practice and Control Conference, in
Vancouver, BC, Canada (October 20-24, 2002). This
conference is held only once every 15 years and he was an invited contributor.
- Selection and Sizing of Copper Solvent
Extraction and Electrowinning Equipment and Circuits, C.G.
Anderson, M.A. Giralico, T.A. Post, T.G. Robinson, O.S. Tinkler, Mineral
Processing Plant Design, Practice and Control, Edited by A.L.
Mular, D .N. Halbe, D.J. Barratt, SME, Volume 2, Vancouver, BC, Canada,
October 20-24, (2002), pages 1709-1744, Paper and Oral Presentation
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Mixing Course at your company
Why not have a mixing
course planned at your facility? You can have a course tailor-made for
your company's processes and products. A mixing course can be as short as
half a day to as long as 4 days. For a description of a mixing course
given at the university of Toronto click
here. This can be a guide of some of the topics that can be given.
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