CaCO3 IN THE PAPER INDUSTRY • BLESSING OR CURSE?, 2013 PEERS Conference

Please Note: This document will be available in PDF format in the "My Electronic Documents" link on the home page once your order has been completed. Please make sure you have the latest version of Acrobat Reader. Click on the Acrobat Reader icon to check for the latest version, it’s FREE. To print a hardcopy of a PDF file correctly you must have a postscript printer. If you are not sure if your printer is a postscript printer please refer to your owner’s manual.

Purchase of electronic (downloadable) documents made at www.tappi.org by credit cards, followed by instant download CANNOT be cancelled. We do not offer refunds on electronic download documents.

Calcium carbonate is often used in the production of graphic papers. There are many reasons for the use like good optical properties and cheap material costs. Therefore the use of calcium carbonate steadily increased for the production of paper. But the high amount of calcium carbonate in the paper for recycling and the narrowing of the water circuits leads to a high concentration of calcium ions in the process water of paper mills. The consequence can be undesired precipitations und depositions of calcium carbonate in machines and plant components of the mills. To avoid or reduce the undesired precipitation and deposition enhanced knowledge about the precipitation potential of calcium carbonate is necessary. The potential is describable by the Langelier Saturation Index (LSI). Investigations of PMV showed that a deposition of calcium carbonate only happens if the LSI value is higher than 0,5. A LSI value above 0,5 often exists in process water which is treated in a biological effluent treatment plant.