Causticizing process in direct causticizing technology.
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概要
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Fundamental and bench scale experiment of our association has been finished. Pilot plant test is now under running and data have been accumulated and analyzed.<BR>The results of fundamental and bench scale test are summerized as follows.<BR>(1) It was confirmed that the development target which is shown below could be accomplished.<BR>Reaction Temperature 70-80°C<BR>Reaction Time 0.5-1 hr<BR>Causticization over 90%<BR>white liquor concentration 250g/<I>l</I> (as Na<SUB>2</SUB>O)<BR>(2) Causticization and behavior of non process elements were investigated and data for scaleup were accumulated by carrying out the recycled test of ferric oxide.<BR>(3) Size distribution of the particle before and after hydrolysis of Na<SUB>2</SUB>Fe<SUB>2</SUB>0<SUB>4</SUB> was measured. It was found out that the particle didn't get finer.<BR>(4) Washing effeciency of recovered ferric oxide after hydrolysis was checked.
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