Synthetic hectorite-type clay minerals

Abstract

Abstract PRODUCTION OF SNYTHETIC SWELLING CLAYS OF THE TYPE OF HECTORITE BY FORMING AN AQUEOUS SLURRY FROM (I) A WATER SOLUBLE MAGNESIUM SALT (II) SODIUM SILICATE (III) SODIUM CARBONATE OR SODIUM HYDROXIDE, AND (IV) MATERIAL DELIVERING LITHIUM AND FLUORIDE IONS SELECTED FROM THE GROUP CONSISTING OF (A) LITHIUM FLUORIDE AND (B) A LITHIUM COMPOUND IN CONJUNCTION WITH HYDROFLUORIC ACID, FLUOSILICIC ACID, SODIUM SILICO FLUORIDE OR SODIUM FLUORIDE; SUCH THAT IN THE SLURRY THE FOLLOWING ATOMIC RATIOS ARE PRESENT SI/F = 0.5 TO 5.1; LI/MG = 0.1 TO 1.0 SI/MG + LI = 0.1 TO 1.5; NA/2MG + F-LI = 1.0 TO 2.0 THE AQUEOUS SLURRY BEING FORMED BY CO-PRECIPITATION BY SLOWLY COMBINING THE SAID MAGNESIUM SALT; THE ACID SODIUM SILICATE; THE SAID SODIUM CARBONATE OR HYDROZIDE, WITH HEATING AND AGITATION, IN AN AQUEOUS MEDIUM WHICH CONTAINS THE SAID MATERIAL DELIVERING THE LITHIUM AND FLUORIDE IONS; TAKING THE AQUEOUS SLURRY SO FORMED AND WITHOUT WASHING IT FREE FROM SOLUBLE SALTS, HYDROT HERMALLY TREATING IT FOR ABOUT 10 TO 20 HOURS TO CRYSTALLISE THE SYNTHETIC MINERALLIKE CLAY; WASHING AND DEWATERING THE RESULTING CRYSTALLISED PRODUCT AND DRYING THE PRODUCT OF A TEMPERATURE UP TO 450*C., PREFERABLY AT 110 TO 250*C.

Inventors

• 👤 Barbara Susan Neumann

Bibliographic Details