Effects of Polyacrylamide Mixtures with Different MolecularWeights on Sedimentation of Red Mud

Abstract:

This paper introduced a method to subside red mud slurry using a kind of mixed polyacrylamide (PAM) solutions which composed two different molecular weights (19×106 and 0.8×106). The mixing ratio and feeding method of the different PAMs were investigated. The results show that the sedimentation rate can be obviously increased when using polyacrylamide mixtures. The optimum PAM mixing ratio (19×106/0.8×106, v/v) is 8:2, and feeding them by adding the mixed PAM solution prepared in advance. In this way, the supernatant liquid height can be increased by 5% compared with that of using PAM of 0.8×106 alone, the settling time can be shortened by 31.9% compared with that of using PAM of 19×106 alone.

• Periodical: Advanced Materials Research (Volumes 396-398)
• Pages: 1466-1469
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.396-398.1466
• Online since: November 2011
• Authors: Hui Xiang Du, Yan Lin Sun, Hong Wang, Yun Hua Huang
• Keywords: Polyacrylamide, Polyacrylamide Mixture, Red Mud Slurry, Sedimentation

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DOI: 10.1016/j.chemosphere.2004.09.008