초록 ▼

A 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

A 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.

대표청구항 ▼

[ What is claimed is:] [1.] A 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 comprising constituents of the waste paper and including organic material including cellulose fi

[ What is claimed is:] [1.] A 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 comprising constituents of the waste paper and including organic material including cellulose fibres and inorganic particulate material including calcium carbonate and other inorganic particulate material included in the waste paper, the method including the steps of subjecting the solid-containing material to a heat treatment which 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; forming the calcined product into an aqueous suspension wherein the calcium oxide is converted to calcium hydroxide; applying comminution to the calcined product in the said aqueous suspension; and adding to the suspension a reagent which forms a salt-forming anionic species to form in the suspension an insoluble calcium salt precipitate mixed or aggregated with other inorganic particulate material derived from the waste paper constituents.