PROCEDE POUR ELIMINER SOUS FORME DE BOUE LA SILICE D'UNE LESSIVE NOIRE

摘要

In order to eliminate silicic acid, CO<u2>2 is introduced to lower the pH of the black lye. The SiO<u2>u concentration of the black lye increases up to a certain value and the pH of the black lye falls to a value lower than 10 in less than 30 minutes; then the mud sediment of silicic acid is separated by centrifugation.