According to the present invention there is provided a method of treating reject from a plant for de-inking waste paper which reject comprises in an aqueous medium a mixture of suspended solids comprising at least ink particles, inorganic particles and fibers, which method includes the steps of (i) chemically...http://www.google.com/patents/US6159381?utm_source=gb-gplus-sharePatent US6159381 - Waste paper treatment process
