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Derivation of methodology capable of identifying suitable collectors for coal flotation by using surface dependant techniques
Author(s)
De Jager, Susanna Gertruida Elizabeth
Date Issued
2002
Type
Thesis
Publisher
Cape Technikon
Abstract
The aim of the study was to develop an understanding of fine coal flotation
emphasizing developing methodology capable of selecting the optimum
flotation reagent. A secondary aim was to use the experimental data in a
statistical program to validate the findings and investigate correlations
between flotation performance and coal characteristics.
The predictions that were made from the coal characterisation results were
confirmed. Oleic acid, iso-decanol and dodecene resulted in the best flotation
performance on the coal samples that were evaluated. This is in agreement
with previous research findings, that oleic acid is a good collector for coal and
that branched hydrocarbons also increase flotation yields. The ability of
unsaturated hydrocarbons to increase flotation yield was also confirmed.
The study included 5 coal samples from different collieries - Twistdraai
(Highveld seam 3 and 4), Waterberg (Zone 10 -11), Syferfontein seam 5
upper (Highveld) and Witbank seam 2 and seam 4. Twistdraai, Waterberg
and Syferfontein seam 5 upper were all found to be vitrinite rich coals. The
Witbank coals are both more inertinite rich. The feed ash contents
determined for the flotation feed samples were 28.8% for Twistdraai coal,
13.9% for Syferfontein seam 5 upper, 28.8% for Waterberg coal, 16.1% for
Witbank seam 2 coal and 33.8% for Witbank seam 4 coal.
The coal characterisation study included petrographic analysis, proximate
analysis, float-sink analysis, oxygen-containing functional groups, surface
extraction, flotation release analysis and contact angle measurements.
emphasizing developing methodology capable of selecting the optimum
flotation reagent. A secondary aim was to use the experimental data in a
statistical program to validate the findings and investigate correlations
between flotation performance and coal characteristics.
The predictions that were made from the coal characterisation results were
confirmed. Oleic acid, iso-decanol and dodecene resulted in the best flotation
performance on the coal samples that were evaluated. This is in agreement
with previous research findings, that oleic acid is a good collector for coal and
that branched hydrocarbons also increase flotation yields. The ability of
unsaturated hydrocarbons to increase flotation yield was also confirmed.
The study included 5 coal samples from different collieries - Twistdraai
(Highveld seam 3 and 4), Waterberg (Zone 10 -11), Syferfontein seam 5
upper (Highveld) and Witbank seam 2 and seam 4. Twistdraai, Waterberg
and Syferfontein seam 5 upper were all found to be vitrinite rich coals. The
Witbank coals are both more inertinite rich. The feed ash contents
determined for the flotation feed samples were 28.8% for Twistdraai coal,
13.9% for Syferfontein seam 5 upper, 28.8% for Waterberg coal, 16.1% for
Witbank seam 2 coal and 33.8% for Witbank seam 4 coal.
The coal characterisation study included petrographic analysis, proximate
analysis, float-sink analysis, oxygen-containing functional groups, surface
extraction, flotation release analysis and contact angle measurements.
Additional information
Thesis (MTech (Chemistry))--Cape Technikon, Cape Town, 2002
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