Micro and colloidal stickie pacification with precipitated calcium carbonate

Abstract

The colloidal stickies which build up in mill process water during pulping are problematic and difficult to remove. The USDA Forestry Service examined precipitated calcium carbonate (PCC) as a means to ameliorate process water stickies, comparing: i) the effectiveness of PCC added directly into a slurry of deinked pulp with ii) in situ precipitation of PCC by the fibre loading method. It was found that without retention aids, fibre loaded PCC resulted in the greatest attraction of colloidal stickies to pulp - following the high-consistency refining required for fibre loading. Also, without retention aids, fibre loaded PCC was the most effective in masking stickies in handsheets. But under the conditions used, PCC, either added directly or fibre loaded, was no more effective than retention aids in removing colloidal stickies from mill water.

Citation

Klungness, John H.; Gleisner, Roland L.; Sykes, Marguerite, S. 2004. Micro and colloidal stickie pacification with precipitated calcium carbonate. Paper technology. (Oct. 2004): Pages 29-33.