| 摘要 |
<p>The subject of the invention is a method for utilising the unreacted carbon from processes for gasifying the spent liquor (black liquor) of alkaline pulping processes. In the new method, the final separation of the unreacted carbon from the soluble salts derived from black liquor does not take place until after the causticising stage. The carbon and limestone are separated and washed together and the limestone-carbon mixture is fed to the calcination reactor where the said carbon functions as a fuel. With this method, carbon replaces, to a significant extent, the normal fuel used in the calcination process. The method differs from other alternatives for utilising unreacted carbon in that its application requires virtually no additional equipment and has no negative effects on the water balance of the pulp mill.</p> |
