IS 4311 : 2024/ISO 602 : 2015 Coal - Determination of Mineral Matter
NATIONAL FOREWORD
This Indian Standard (First Revision) which is identical to ISO 602 : 2015 'Coal - Determination of mineral matter' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendations of the Solid Mineral Fuels and Solid Biofuels Sectional Committee and approval of the Petroleum, Coals and Related Products Division Council.
The mineral matter or inorganic constituents of coal are generally the sum of all constituents in coal that are not the part of the organic coal substances that is carbon, hydrogen, nitrogen, oxygen, and sulphur (organic), or moisture associated with coal. In all fundamental studies on coal, correct evaluation of mineral matter is essential as the composition of the coal, which is calculated from the analysis of the air-dried sample and can only be arrived at, if the quantity of non-coal substance is accurately known. For low ash coals, difference between the results expressed on dry, ash-free and on dry, mineral free basis is not very significant; but for high ash coals the difference is appreciable. Therefore, the determination of mineral matter in high ash coals, as in the case of most Indian coals, is of utmost importance.
The mineral constituents of coal are intimately bound with the coal substances, thus making the separation of mineral matter by any physical method impossible. In the direct method, the coal is partially demineralized, which leaves the coal substances unaffected. By separate estimation of ash and of iron, the mineral matter is calculated. Indirect methods have also been developed, where mineral matter is calculated from the ash content. However, such a method is not covered in this standard.
This standard was originally published in 1967 based on the draft ISO/R/679 'Determination of mineral matter in coal (revised text)'. This revision has been undertaken to align it with the latest version of ISO 602 : 2015 'Coal - Determination of mineral matter'.
The text of ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:
a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 'Indian Standard'; and
b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.