摘要 |
<p>A method of treating zeolites to remove therefrom discoloring impurities and improve the brightness thereof, comprising the steps of mixing a pulverized sedimentary zeolite ore with a dispersant and water to form a dispersed aqueous zeolitic slurry, degritting the resulting slurry, removing fines containing discoloring impurities from the degritted slurry, thereafter subjecting the zeolitic slurry to a fine media milling, removing fines containing discoloring impurities from the resulting fine milled slurry, subjecting the fine milled slurry to magnetic separation to remove magnetic discoloring impurities, bleaching the resulting zeolitic slurry and then recovering the zeolitic product in dry form from the resulting slurry. The dry finely ground zeolitic product made by this method has a particle size of at least 85% below 2 um and a Tappi brightness of at least 90. It also exhibits the ion exchange characteristics of zeolite and possesses a bulk density (loose or packed) of about half or less of high quality kaolin clay pigments. Papers filled with the novel zeolitic product and processes for making same. Coating materials, e.g., paints and papers coatings, containing the novel zeolitic products and papers coated therewith.</p> |