A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Un método para producir relleno
Un método para producir relleno, que comprende carbonato de calcio precipitado (PCC), cuyo método comprende los pasos de; - proporcionar cenizas volantes generadas en la producción de papel o cartón; - fraccionar dicha ceniza volante en al menos un paso, por lo que una fracción más gruesa se separa de una fracción más fina; - moler dicha fracción más gruesa a un tamaño medio de partícula de 20 μm o menos; - formar una suspensión de dicha fracción más gruesa triturada; - agregar dióxido de carbono a dicha suspensión para formar carbonato de calcio precipitado.
The invention provides a method of producing a filler comprising calcium carbonate (PCC), preferably to be used in paper or paper board production or in fibre based composites. The method of the invention comprises the steps of; —providing fly ash generated in paper or paper board production; —fractionating said fly ash in at least one step, whereby a coarser fraction is separated from a finer fraction; —forming a suspension of said coarser fraction; —adding carbon dioxide to said suspension to form precipitated calcium carbonate. The method of the invention avoids problems with high amounts of arsenic and heavy metals in the production of filler comprising PCC, when using ash generated in paper or paper board production as a raw material. It has been shown that harmful elements, such as arsenic and heavy metals, are primarily accumulated in the finer fractions of the fly ash. Thus, by using the coarser fraction in the step of carbonation, the amount of arsenic and heavy metals in the final product is reduced.
Un método para producir relleno
Un método para producir relleno, que comprende carbonato de calcio precipitado (PCC), cuyo método comprende los pasos de; - proporcionar cenizas volantes generadas en la producción de papel o cartón; - fraccionar dicha ceniza volante en al menos un paso, por lo que una fracción más gruesa se separa de una fracción más fina; - moler dicha fracción más gruesa a un tamaño medio de partícula de 20 μm o menos; - formar una suspensión de dicha fracción más gruesa triturada; - agregar dióxido de carbono a dicha suspensión para formar carbonato de calcio precipitado.
The invention provides a method of producing a filler comprising calcium carbonate (PCC), preferably to be used in paper or paper board production or in fibre based composites. The method of the invention comprises the steps of; —providing fly ash generated in paper or paper board production; —fractionating said fly ash in at least one step, whereby a coarser fraction is separated from a finer fraction; —forming a suspension of said coarser fraction; —adding carbon dioxide to said suspension to form precipitated calcium carbonate. The method of the invention avoids problems with high amounts of arsenic and heavy metals in the production of filler comprising PCC, when using ash generated in paper or paper board production as a raw material. It has been shown that harmful elements, such as arsenic and heavy metals, are primarily accumulated in the finer fractions of the fly ash. Thus, by using the coarser fraction in the step of carbonation, the amount of arsenic and heavy metals in the final product is reduced.
Un método para producir relleno
SKERFE ELINA (author) / MATTSSON ERIK (author)
2020-06-18
Patent
Electronic Resource
Spanish
IPC:
D21H
PULP COMPOSITIONS
,
Faserbreimischungen [Pulpen]
/
C04B
Kalk
,
LIME
/
C09C
TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES
,
Behandlung von anorganischen Stoffen, außer von faserigen Füllstoffen, zum Erhöhen ihrer pigmentierenden oder füllenden Eigenschaften
/
D21C
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS
,
Gewinnung von Cellulose durch Abscheiden nichtcelluloseartiger Substanzen von cellulosehaltigen Stoffen
Relleno de césped artificial y método para confeccionarlo
| European Patent Office | 2020