Treatment of solid containing material derived from effluent or waste from wastepaper treating process

摘要

PCT No. PCT/GB96/00884 Sec. 371 Date Feb. 27, 1997 Sec. 102(e) Date Feb. 27, 1997 PCT Filed Apr. 11, 1996 PCT Pub. No. WO96/32354 PCT Pub. Date Oct. 17, 1996A method of treating solid-containing material contained in or produced from an effluent or waste from a process for the treating of waste paper. The solid-containing material includes constituents of the waste paper and organic material including cellulose fibers and inorganic particulate material including calcium carbonate and other inorganic particulate material included in the waste paper. The solid-containing material is subjected to a heat treatment that incinerates the organic material present and forms from the inorganic particulate material present a calcined product including calcium oxide from thermal decomposition of calcium carbonate. The calcined product is formed into an aqueous suspension wherein calcium oxide is converted to calcium hydroxide. The calcined product in the suspension is comminuted and a reagent is added to the suspension to form a salt-forming anionic species to form an insoluble calcium salt precipitate mixed or aggregated with other inorganic particulate material derived from the waste paper constituents.