Characterization of sulphur in coal and coal products by standard and non-standard methodsFunded under: ECSC-COALRES 3C
Sulphur plays an important role in the coal industry. Its calculation can help determine the quality of coal, indicate the efficiency of the coal cleaning process and enable it to be used as an environmentally friendly fuel. For this project, the total sulphur content and forms of sulphur are determined by two methods outlined in the American Standards for Testing and Materials (ASTM). Total sulphur content may be determined where sulphur is converted to sulphate using Eschkas mixture and leached out with hot water. Also washings from an oxygen bomb calorimeter (used to measure the reaction value of the coal sample) are collected and the sulphate content is measured. Forms of sulphur may be determined in two ways. Sulphate sulphur may be extracted using boiling dilute hydrochloric acid which can then be precipitated as barium sulphate. Pyritic sulphur may be determined indirectly as iron, where nitric acid is used to extract it. This results with pyritic iron which can then be determined by atomic absorption spectroscopy. Alternative methods include scanning electron microscopy with energy dispersive X-ray analysis (SEM-EDX) to determine non pyritic sulphur in coal. Additionally, X-ray fluorescence spectroscopy (XRF) and scanning electron microscopy (SEM) may be used.
Bibliographic Reference: EUR 17980 EN (1998) 59pp.
Availability: Available from OOPEC Sales agents
Record Number: 199910033 / Last updated on: 1999-02-11
Original language: en
Available languages: en