Method and apparatus for reducing impurities in cellulose fibers for manufacture of fiber reinforced cement composite materials
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United States of America Patent
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Sep 18, 2012
Grant Date -
Aug 16, 2012
app pub date -
Feb 17, 2012
filing date -
Oct 17, 2000
priority date (Note) -
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Abstract
A method of manufacturing high purity fiber cement grades of cellulose fibers is described. Additional washing steps, coupled with an elevated temperature, are used in the process to extensively wash the pulps and remove substantially all COD components remaining in the pulps. The pulps are counter-currently washed by diffusion and dewatering at elevated temperatures following the brown stock washer systems. During the additional washing steps, the pulps are soaked in counter-current heated water for a pre-determined time and some chemicals may be introduced to chemically break down the COD components in the pulps and to make them more soluble in the aqueous solution. The additional washing steps can be performed using existing equipment at conventional pulp mills.
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