Experimental Research on Strengthening Sedimentation of the Flotation Tailings of Bauxite

In order to solve the problem that the flotation tailings of the bauxite was very difficult to be settled,the flotation tailings of bauxite from Henan was studied in this paper, and the sedimentation behavior and strengthening measures of the tailings were systematic studied by single factor and orthogonal static sedimentation experiments under different pH and different slurry concentration as well as different type and dosage of flocculants. The results showed that the size of the particle and the surface static potential of the particle were the key effect factors for the sedimentation rate of tailings, and good sedimentation of tailings can be achieved by adjusting pH. The molecular weight of 8 million anionic polyacrylamide can significantly strengthen the sedimentation rate of tailings. Among the three factors,the slurry pH has the most significant influence on the sedimentation rate followed by the unit consumption,and the amount of polyacrylamide was relatively the least. Good sedimentation indicators could be obtained under conditions that the slurry concentration is 8%,the pH value of slurry is 7.05,the unit consumption of polyacrylamide is 200 g/t and the concentration of polyacrylamide is 0.15%, and the average sedimentation rate is 5.58 mm/min which is better than the original sedimentation rate of 0.35 mm/min.