1414 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
70. Conversely, Seam B, generally considered to be poorly
performing, showed challenges with washability and con-
versely a Wn of 42, with good performance in the Wn
42–60 range, and very good for Wn 60. Figure 2 and
Figure 3 illustrate the distribution of Wn for Seams A and
B, highlighting significant variability in coal quality. This
suggests that different mining areas expose distinct seam
profiles with varied lithologies which impact the washabil-
ity responses.
Washability data by bulk sample
Washability performed by commercial labs were used as the
basis for bulk sample washability evaluations. The wash-
ability data is performed on size ranges closely resembling
the coal streams that are processed at the plant. The wash-
ability curves are plotted using float-and-sink data to reflect
the yield of coal at each density of separation and ash con-
tent and their various correlations for clean coal and rejects
(Figure 4).
Figure 2. Distribution of Wn number for Seam A
Figure 3. Distribution of Wn number for Seam B
70. Conversely, Seam B, generally considered to be poorly
performing, showed challenges with washability and con-
versely a Wn of 42, with good performance in the Wn
42–60 range, and very good for Wn 60. Figure 2 and
Figure 3 illustrate the distribution of Wn for Seams A and
B, highlighting significant variability in coal quality. This
suggests that different mining areas expose distinct seam
profiles with varied lithologies which impact the washabil-
ity responses.
Washability data by bulk sample
Washability performed by commercial labs were used as the
basis for bulk sample washability evaluations. The wash-
ability data is performed on size ranges closely resembling
the coal streams that are processed at the plant. The wash-
ability curves are plotted using float-and-sink data to reflect
the yield of coal at each density of separation and ash con-
tent and their various correlations for clean coal and rejects
(Figure 4).
Figure 2. Distribution of Wn number for Seam A
Figure 3. Distribution of Wn number for Seam B