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Process for removing silica from cellulosic material


Title: Process for removing silica from cellulosic material.
Abstract: A method of cellulosic raw material desilication involves the steps of impregnating the cellulosic raw material with a solution containing sodium carbonate to form a silica-containing impregnation black liquor and an at least partially desilicated raw material, separating the silica-containing impregnation black liquor from the at least partially desilicated raw material, causticizing the separated silica-containing impregnation black liquor to precipitate silica-enriched calcium carbonate and separating the precipitated silica-enriched calcium carbonate from the causticized impregnation liquor. Up to 100% of the silica contained in the cellulosic raw material can be removed before the raw material is processed by any of conventional pumping methods. ...


- Kalamazoo, MI, US
Inventors: Jan Pekarovic, Alexandra Pekarovicova
USPTO Applicaton #: #20060225852 - Class: $ApplicationNatlClass (USPTO) -


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Related Patent Categories: Paper Making And Fiber Liberation, Processes Of Chemical Liberation, Recovery Or Purification Of Natural Cellulose Or Fibrous Material, With Regeneration, Reclamation, Reuse, Recycling Or Destruction Of Digestion Fluid
The Patent Description & Claims data below is from USPTO Patent Application 20060225852, Process for removing silica from cellulosic material.

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stats Patent Info
Application #
US 20060225852 A1
Publish Date
10/12/2006
Document #
File Date
12/31/1969
USPTO Class
Other USPTO Classes
International Class
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