Method for crystallizing a filler in connection with a fiber web process, and an approach system for a fiber web machine
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United States of America Patent
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Jun 10, 2014
Grant Date -
Nov 7, 2013
app pub date -
Jun 28, 2013
filing date -
Feb 22, 2008
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Abstract
Methods are provided for crystallizing a filler, especially in order to precipitate calcium carbonate on the surfaces of solids in the short circulation of a fiber web machine by feeding carbon dioxide and lime milk to the liquid flow of the short circulation and allowing them to react with one another, is characterized in that the feed system, the mixing method and/or mixing rate of the chemicals are selected such that a size distribution of the calcium carbonate crystals suitable for the purpose is obtained. Moreover, the invention relates to an approach system for a fiber web machine applying this method, characterized in that it is provided with devices for feeding and mixing carbon dioxide and lime milk into the liquid flow at such a rate that the applicable size distribution of the calcium carbonate crystals is obtained.
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