Back to results
US 3,985,567 AGranted
Method of treating bauxite waste red mud with acid and making construction bricks from the treated material
AssigneeUniversity of Guyana
InventorGregory Onyemauwa Iwu
Life of this patent
Estimating the term…
Abstract
Bauxite waste red mud is treated with hydrochloric acid to dissolve only the sodium content. The treated material is mixed with kaolinitic clay and formed into construction bricks.
Claims3
An improved method of treating bauxite waste red mud comprising Fe.sub.2 O.sub.3, SiO.sub.2, Al.sub.2 O.sub.3, TiO.sub.2 and Na.sub.2 O with acid to remove sodium therefrom and to obtain commercially useful material therefrom, wherein, the improvement comprises:
- a. suspending said waste red mud which has been dried in water;
- b. titrating the suspension with a molar solution of hydrochloric acid corresponding to the sodium content of the red mud until the pH of the suspension is between 5.5-6;
- c. continuously agitating the suspension during titration;
- d. allowing the suspension to settle after titration;
- e. separating the liquid portion containing sodium chloride from the solid portion;
- f. washing said solid portion until portions of the filtrate from said washings yield substantially no crystals on evaporation to dryness;
- g. and converting said solid portion to a dry powder.
4 more elements
Dependencies are inferred from the claim text.