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The Inhibition of
Vashnevite Scale in Chinese Refineries Using Max
HT™
550 |
Presented by:
Qi Dai, Sr. Business Development Manager,
Alumina Processing Chemicals
Duration : 12 minutes
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Cytec invented the MAX HT technology for the
inhibition of sodalite scale in Bayer plants.
More recently, the second generation of the
technology was developed for better tolerance of
solids present in the liquor where it is applied.
It was found that the second generation product
also performed better than the first generation
in the inhibition of Vashnevite scale, which is
found more common in China, where diasporic
bauxite is processed. This presentation shows
laboratory examples of the scale inhibition
performance. |
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New Flocculants
for Improved Processing of High Silica Bauxite |
Presented by:
Qi Dai, Sr. Business Development Manager,
Alumina Processing Chemicals
Duration : 7 minutes
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Cytec has developed a new flocculant that has
shown unique performance for red mud generated
from high silica bauxite. This new flocculant,
when used in combination with regular flocculant,
can increase mud settling rate and improve
clarity beyond what regular flocculants can
provide. Laboratory examples are presented with
cases involving settler mud and washer mud. |
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Red Mud
Flocculants used in the Bayer Process |
Presented by:
Scott Moffatt, Applications Specialist,
Alumina Processing Chemicals
Duration : 24 minutes
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This webevent takes a historical look at the
different types of polymers used by the alumina
industry to flocculate red mud. Details are
provided on how the industry initially started
using starch and then moved to synthetic
polymers, and ultimately modified synthetic
polymers such as hydroxamated polyacrylamides.
Composition and structural differences among the
different polymers is discussed, and serves as a
basis for explaining the different performance
attributes held by the polymers. |
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New Polymers for
Improved Flocculation of high DSP: Containing
Muds |
Presented by:
Matt Davis, Manager, Alumina Applications
Technology Group
Duration : 15 minutes
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The production of alumina from bauxite requires
an effective solid-liquid separation in gravity
thickeners to generate liquor containing low
amounts of suspended solids. As the quality of
bauxite continues to deteriorate (increased
reactive silica content), this separation
becomes more difficult due to the formation of
desilication products (DSP). The presence of
DSP has a detrimental effect on various areas of
alumina production and cannot be overcome using
conventional flocculants.
It has been discovered that
polymers incorporating silane functionality show
improved flocculation of suspended DSP solids
when added to the slurry in combination with
hydroxamated polyacrylamide (HXPAM). Recent
developments will be presented to demonstrate
the utility of this new molecule for improved
clarification of red mud containing slurries
generated in the Bayer Process. |
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MAX HT™ Sodalite
Scale Inhibitor: Plant Experience |
Presented by:
Morris Lewellyn, Research Fellow, Alumina
Processing Chemicals
Duration : 17 minutes
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This presentation describes
the deve-lopment and plant testing of MAX HT™ 550 Sodalite Scale Inhibitor. MAX HT™ 550 was
developed to be more tolerant of low levels of
solids (<200 mg/l) found in many double stream
plants, resulting in efficient inhibition of
sodalite scale at low doses. |
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Factors Affecting
Clarity in Lab Hydrate Settling Tests |
Presented by:
Scott Moffatt, Applications Specialist,
Alumina Processing Chemicals
Duration : 18 minutes
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During this webevent, you
will see the results of an experiment with a
full factorial design to estimate the effects of
controlled changes in liquor temperature, solids
concentration and particle size distribution on
supernatant clarity in laboratory-scale settling
tests.
The liquor was tested “as is” and after
treatment with a flocculant. The experiment was
carried out on three separate occasions to
provide some information on the magnitude of
experimental error in the test setup.
Each of the factors had a statistically
significant main effect on clarity when varied
over a reasonable range such as could be
encountered in practice; there were also some
statistically significant interactions among the
factors. Effect magnitudes and confidence
intervals are reported, and the implications of
the findings on the conduct and interpretation
of laboratory testing and on the assessment of
the performance of a plant scale hydrate
classification circuit are discussed. |
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