Bleaching of defibered pulp involves using peroxide in alkaline conditions obtained by adding alkali metal aluminate to the pulp to be bleached, in which part of the alkali metal aluminate is the dissolved ash
摘要
<p>A defibered pulp is bleached using a peroxide in alkaline conditions obtained by adding alkali metal aluminate to the pulp (14) to be bleached; washing the bleached pulp (15); and recovering chemicals from spent liquor by concentrating and combusting the spent liquor and dissolving the ash into water. At least a part of the added alkali metal aluminate (12) is the ash (28) dissolved in water.</p>
