Do hydroxamated polyacrylamide flocculants benefit primary red mud settlers?

Summary of benefits provided by hydroxamated polyacrylamide flocculants on primary red mud settlers. This paper has summarized the main types of flocculants used by the alumina industry, since the process was first discovered by Bayer.

Can hydroxamated polyacrylamide be used for settling mud?

Occasionally, the use of HXPAMs is extended down the washer train to deal with difficult settling mud. Figure 7. Supernatant clarity from lab tests showing the different responses achieved with hydroxamated polyacrylamide and traditional polyacrylate flocculants.

Why are hydroxamated flocculants used in red mud settling?

As hydroxamate group has a very strong affinity for iron bearing minerals and tends to adsorb through a chemisorption (chelation) mechanism, hydroxamated flocculants are widely used for the red mud settling , and the performance improvement associated with the use of these flocculants has also been reported [5−6].

What is flocculation & separation of red mud?

Flocculation and separation of red mud is an integral part of the Bayer process. Over the latter half of the 20th century, flocculant technology dramatically changed from natural starches to use of “rationally designed” polymers.

Why do mud settlers use polyacrylate?

This is attributable to the high molecular weight and high charge density which affect how, and how much, polymer is adsorbed on mud particle surfaces. In primary red mud settlers polyacrylate is by far the most effective flocculant of the polymers discussed so far.

Can flocculants settle red mud?

Discussion of flocculants is based on inventions in the published literature that have gained widespread use throughout the industry and will included the benefits/advantages of different flocculant technology for settling red mud.