Here Is The Coal Quality Analysis Method That Used by PTBA
The price of coal is highly depends on the quality, the better quality means the higher price. That is why the quality of coal that has been there should always be maintained to avoid the occurrence of a difference in quality of the contracts that have been agreed with the buyer.
The quality of coal consists of several parameters, namely Total Mouisture (TM), Inherent Moisuter (IM), Fixed Carbon (FC), Ash, Volatile Matter (VM), total sulfur (TS) and Calorie Value (CV). In general, there are two methods of analysis used to determine the quality of the coal is dried water-based (adb) and as received (ar).
Analysis of air-dried base (adb) is the analysis of coal samples conducted in an ambient air humidity. The coal sample will saved for a time so that the moisture content is reduced. Meanwhile, analysis as recievied (ar) is analysis of coal sample directly performed when the samples were received at the laboratory, so the moisture content of coal samples will be influence on the value of quality.
The fundamental difference in this analysis is affected both by Total Moisture (TM). Ingredients TM can lower the quality of the coal, especially on the value Calorific Value (CV). If the value of TM automatically increases the caloric value will go down, otherwise if TM can be maintained or lowered the CV value will be relatively stable even be increased.
By the end of 2015 for the operational activity data, PTBA using quality analysis (adb) as a reference work, but this time quality analysis used is (ar). This analysis has been choosen because of the demands of the market and facilitate the coordination of the quality of downstream to upstream activities.