6. TECHNICAL SESSION AGENDA
October 22, 2001
Chairman: Rae Cunnington, Sandwell Engineering Services, Vancouver, B.C.
6.1 Filtrate Recycling Facilities at Paprican & Bleach Plant Pilot Plant Update, by Jean Bouchard
Jean's presentation is included in the Attachments to the minutes.
Q. Add more chemical? A. Yes, Add for decomposition expected.
Q. ClO2 residual or exhausted? A. No measurement. No brightness gradient.
Q. Why is overall yield for Sequencer lower? A. 3 Different experiments.
Q. Configure dilution factor as wash the pulp, e.g. 2, 0, -1? A. Yes.
Q. Check annular differences in pulp. Inside out? A. He will check.
Q. Monitor pH? A. Yes. Q. Wash effic.? A. Mimic mill wash effic.
Q. No mechanical mixing? A. No. Q. To compare with High Shear Mixing would see higher tensile strength coming out of lab sequence. A. Yes.
Q. System automatically measure Kappa and brightness after each stage. Q. No.
6.2 Changes to Filtrate Recycle Scheme at DMI Peace River by Guy Normandeau.
Guy was not able to attend the Committee meeting but his presentation is attached to the minutes.
6.3 Recent Studies on Effluent Closure at Skookumchuck & Eop Filtrate Recycle Update, by Gavin Baxter of Tembec
Presentation is included in the minutes.
Q. Organics? A. = colour components.
Q. ESP dust coloured? A. No, clear. Low odour boiler.
Q. How much dust? A. 3% of dust.
Q. PDP effluent? A. Put back into sodium cycle (dissolving tank).
Q. Saltcake recovery? A. Good, not a lot of losses.
Q. 4.5 down to 2 liquor to BP scrubbers? Still in compliance. A. Yes, can go down to 2 gpm. Q. Analyzer type? A. Current usage is about 18 tpd ClO2. Q. Chlorides? A. 4.9 gpl chlorides now was 1 prior to recycle.
Q. Current water usage? A. 6000 gpm is current water usage. 40 m3/tonne.
Q. Sulfidity? A. Try to keep % sulfidity at 28 to 30 TTA basis. i.e. same.
6.4 Progressive System Closure, a paper by Richard Berry et al but presented here by Jean Bouchard
Presentation is included in the minutes.
Q. Biggest capacity that Recoflow tried? A. Only Pilot Plant scale. Has been applied in other industrial processes. Champion uses MRP. Acid recovery process is well proven in mining industry. Need different resins but proven technology.
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6.5 Ultrafiltration of Eop Filtrate & Recycle to the Brownstock Area, by Doug Reid of EKA Chemicals
Presentation is included in the Attachments to the minutes.
Q. Flow? A. 300 gpm throughput on O2 filtrate.
Q. Did Leaf River install this system? A. No, pure environmental no payback and there is no capital right now.
Q. Remove metals, pitch or something else that would have operational benefit? A. Yes, 65% metals removal.
6.6 Modeling Bleach Washers & Filtrate Recycle, by Larry Wasik of Aurel
Presentation is included in the minutes.
Q. Assume one efficiency? Q. Yes, e.g. grouped inorganics.
6.7 Mill Results on Low versus MC D0 stage, by Murray Walters, Pope & Talbot, Nanaimo
Presentation is included in the minutes.
6.8 MVP Safety Program at Halsey by Jeff Mills, Pope & Talbot, Halsey
6.9 Update Blueridge Paper BFR by Paul Earl
Paper is included in minutes.
Q. Reliability? A. 75% Online factor for MRP. Mechanical problems. Ion exchange weak spot. CRP is high 90's.
Q. Purge streams? A. Both MRP & CRP purge streams are sewered.
Q. On both? A. Just on SW. But common boiler. Recover 20% of Eop on HW.
Q. Installed elsewhere? A. CRP also put in at former Union Camp mill w/o ozone. Eastover.
(Correction by Paul Earl, October 28, 2001
At last week's Bleaching Committee Technical Session, I gave an incorrect response to a question about the Metals Removal Process for the BFR installation at Blue Ridge Papers in Canton NC. The actual uptime for the Metals Removal Process is about 90%, not 75% as I stated. 75% is the portion of D100 filtrate, which they are treating and recovering.)
Technical Session PAPTAC Bleach Committee Meeting Fall 2001.doc