초록 ▼

Separation of impurities from kaolin clay is accomplished by conditioning a dispersed aqueous pulp of the clay with an anionic flotation collector, followed by centrifugation or the like to cause the impurities to settle from a dispersed pulp of the clay without an intermediate froth flotation step

Separation of impurities from kaolin clay is accomplished by conditioning a dispersed aqueous pulp of the clay with an anionic flotation collector, followed by centrifugation or the like to cause the impurities to settle from a dispersed pulp of the clay without an intermediate froth flotation step or a flotation waste froth is centrifuged or hydrocloned to recover valuable kaolin contained in the froth.

대표청구항 ▼

A method for purifying kaolin clay which consists essentially of the steps of: (a) providing degritted impure kaolin clay containing particles of a colored iron-contaminated titania impurity, said degritted impure kaolin clay being in the form of a fluid dispersed alkaline aqueous pulp and the dispe

A method for purifying kaolin clay which consists essentially of the steps of: (a) providing degritted impure kaolin clay containing particles of a colored iron-contaminated titania impurity, said degritted impure kaolin clay being in the form of a fluid dispersed alkaline aqueous pulp and the dispersant being selected from the group consisting of alum-silica hydrosol, sodium silicate, sodium carbonate, sodium polyacrylate and mixtures thereof, said pulp being free from a phosphate dispersant; (b) conditioning said pulp from step (a) by agitating it in a squirrel cage mixer with calcium chloride and an anionic collector reagent comprising oleic acid capable of selectively collector-coating said iron-contaminated titania impurity; (c) subjecting the entirety of the conditioned pulp from step (b) to centrifugation or hydrocloning to sediment selectively collector-coated iron-contaminated impurity; and (d) separating said sediment from the remainder of the pulp which is a dispersed concentrate of purified kaolin.