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Calcium carbonate in the paper industry - blessing for coated papermaking and curse for recycling processes

Tappi journal, 2014-11, Vol.13 (11), p.47-54

ISSN: 0734-1415 ;EISSN: 0734-1415 ;DOI: 10.32964/TJ13.11.47

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  • Title:
    Calcium carbonate in the paper industry - blessing for coated papermaking and curse for recycling processes
  • Author: SCHABEL, SAMUEL ; PUTZ, HANS-JOACHIM ; HAMM, UDO ; KERSTEN, ANTJE ; BOBEK, BRIGITTE ; HIRSCH, GEORG ; VOSS, DENNIS
  • Is Part Of: Tappi journal, 2014-11, Vol.13 (11), p.47-54
  • Description: Calcium carbonate provides good optical properties to graphic paper and is relatively inexpensive. Therefore, the use of calcium carbonate for the production of paper has steadily increased. But the high amount of calcium carbonate in paper for recycling and the closure of water circuits leads to a high concentration of calcium ions in the process water of paper mills. The consequence can be undesired precipitation and deposition of calcium carbonate in machines and plant components of the mills. Enhanced knowledge about the precipitation potential of calcium carbonate is needed to avoid or reduce undesired precipitation and deposition. The potential can be described using the Langelier saturation index (LSI). Our investigations showed that a deposition of calcium carbonate only happens if the LSI value is higher than 0.5. An LSI value above 0.5 often exists in process water that is treated in a biological effluent treatment plant. Reasons for such values are the increase in hydrogen carbonate concentration (m-alkalinity) by carbon dioxide production and the increase of the pH value by reduction of fatty acids. With the knowledge about the precipitation potential of calcium carbonate in a process water line, suitable measures could be implemented.
  • Language: English
  • Identifier: ISSN: 0734-1415
    EISSN: 0734-1415
    DOI: 10.32964/TJ13.11.47
  • Source: Alma/SFX Local Collection
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