BS ISO 11760:2005 pdf download.Classification of coals.
5 Nature of the coal sample
The classification, within reason, may be applied to characterize any coal sample. The classification refers specifically to the coal sample being examined and this may not be fully representative of the coal in the seam(s) from which it was derived. The rank of blends, as indicated by the mean random reflectance, Rr. 04 the vitrinite, s dependent on the R,tor each of the components in the blend: the petrographic composition and ash yields reflect the sampling, preparation and blending involved.
NOTE See coTvnent in d), below.
Thus when a coal sample is classified, a brief definitive description of the nature of the sample with regard to its sampling and preparation shall accompany the classification. Answers to the following questions need to be specified for the sample classified.
a) Is it a ful seam or seam section sample, ethor as mined or sampled in siIu?
b) Is it a washed product?
c) Is it a specific size fraction?
d) Is it a blend? A blend should be of coals of similar rank only.
6 Descriptive classification terminology
The descriptive term used for each of the rank-dependent categories and sub-categories is accompanied by an alternative descriptive term (see Clause 4) that relates to the rank-dependent terms in use in existing ISO standards for the analysis and testing of coals.
Basing the classification system on thee parameters (vitrinite reflectance, vitrinite content and ash yield) with descriptive class sub-category terms for each of these, permits the use of a relatively simple descrtive classification of a particular coal sample. Some examples are shown in Table 7.
The classification, within reason, may be applied to characterize any coal sample. The classification refers specifically to the coal sample being examined and this may not be fully representative of the coal in the seam(s) from which it was derived. The rank of blends, as indicated by the mean random reflectance, Rr. 04 the vitrinite, s dependent on the R,tor each of the components in the blend: the petrographic composition and ash yields reflect the sampling, preparation and blending involved.
NOTE See coTvnent in d), below.
Thus when a coal sample is classified, a brief definitive description of the nature of the sample with regard to its sampling and preparation shall accompany the classification. Answers to the following questions need to be specified for the sample classified.
a) Is it a ful seam or seam section sample, ethor as mined or sampled in siIu?
b) Is it a washed product?
c) Is it a specific size fraction?
d) Is it a blend? A blend should be of coals of similar rank only.
6 Descriptive classification terminology
The descriptive term used for each of the rank-dependent categories and sub-categories is accompanied by an alternative descriptive term (see Clause 4) that relates to the rank-dependent terms in use in existing ISO standards for the analysis and testing of coals.
Basing the classification system on thee parameters (vitrinite reflectance, vitrinite content and ash yield) with descriptive class sub-category terms for each of these, permits the use of a relatively simple descrtive classification of a particular coal sample. Some examples are shown in Table 7.
