Coal Of Brand D (Long -Flame). The Brand Is Long -Placed - It Is Stone Coal With The Lowest Degree Of Metamorphism. The Material Is Black Or Dark Gray, Brilliant. The Structure Of The Brand D Is Layered, Porosity Is Expressed. The Strength Of This Variety Is Higher Than That Of Brown Coal. Characteristics Of Long-Flavored Coal: Carbon Content-70-80%. The Density Ranges From 1000 To 1400 Kg/M3. Reflection Indicator. Shine-0.4-0.79%. The Heat Of Combustion Is 5000-5800 Kcal. Humidity-17-19%. Ash-7-40%.
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