What is the difference b/w ASTM D3172 and ASTM-D5142 methods for Proxmate analysis of lignite type coal? Which method is more accurate?

03 March 2015 6 2K Report

What is difference b/w ASTM D3172 and ASTM-D5142 methods for Proxmate analysis for coal of lignite type?

whose method is accurate and how much error between them of these two methods?

Questions in Your Topics. Available from: https://www.researchgate.net/topics?askQuestion=1&tpca=1 [accessed Mar 20, 2015].

Mushtaq Ahmad

ASTM D3172 – A Standard Practice for Proximate Analysis of Coal and Coke - This practice covers the determination of moisture, volatile matter, and ash and the calculation of fixed carbon on coals and cokes sampled and prepared by prescribed methods and analyzed according to ASTM established procedures.

ASTM D5142 – Test Methods for Proximate Analysis of the Analysis Sample of Coal and Coke by Instrumental Procedures – Proximate analysis is most frequently used as an analysis for characterizing coals in connection with their utilization because it separates the products obtained when heated into four groups: (1) moisture, (2) volatile matter, (3) fixed carbon, and (4) ash. The amount of carbon residue remaining after the volatile matter test is measured by subtracting the sum of percentages of the remaining three products (moisture, volatile matter, and ash) from 100. This value represents fixed carbon. The fixed carbon value is used in determining the efficiency of coal burning equipment and as an indication of the yield of coke in a coking process. It does not take into account the amount of carbon that is lost in hydrocarbons with the volatiles during pyrolysis and therefore may not give an accurate measurement of the carbon content in coal. Fixed carbon can also contain appreciable amounts of sulfur, hydrogen, nitrogen and oxygen.

ASTM D5142-09: Standard Test Methods for Proximate Analysis of the Analysis Sample of Coal and Coke by Instrumental Procedures (Withdrawn 2010)

REPLACED BY D7582

ASTM D7582 - 12

Standard Test Methods for Proximate Analysis of Coal and Coke by Macro Thermogravimetric Analysis