Pulp washing method and plant
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United States of America Patent
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Sep 14, 2004
Grant Date -
N/A
app pub date -
Jan 17, 2002
filing date -
Jul 21, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of improving the efficiency of the multistage washing of pulp, wherein the initial washing of a given batch of pulp is carried out using a gradually diluted, recovered filtrate fraction originating from the washing of the preceding batch of pulp as the washing liquid, prior to the final washing of the pulp batch. In the method, the recovered fraction filtrate is kept stored in such a way that the concentration gradient of dissolved substances is maintained until the fraction is used for washing the following batch of pulp. A further object of the invention is a pulp washing plant, wherein the method according to the invention is carried out in a laboratory-scale test washer and applied to industrial pulp washing plant solutions.
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