METHOD FOR IMPROVING THE BRIGHTNESS OF GRAY SEDIMENTARY KAOLIN CLAY

摘要

An improvement in a process for brightening gray sedimentary kaolin clay by oxidizing an aqueous pulp of the clay with ozone and subsequently removing Titania from a deflocculated pulp of the clay by flotation. A basic reagent capable of reducing the calcium ion concentration of the pulp is added after the ozone treatment and before the flotation treatment.