An Examination of the Heavy Mineral Content of Silica Sands Used for Glass-making

JSGT 1945 V29 T250-T257

The heavy mineral percentage of a number of British and foreign sands used for the manufacture of colourless glass has been determined. A rapid analytical method is given for the determination of their chromium content and also that of the sand itself. Possible methods for the elimination of heavy minerals from sand are discussed. An indication is given of the amounts of iron oxide and chromium oxide permissible in soda–lime–silica glass melted in a tank furnace so that satisfactory decolourising may be effected.

F. W. Adams