The term “ Amount of produced coal dust” in coal mining has been carelessly used without any definite idea when the amount of suspending or settling coal dust in coal mine was measured. By generalizing some experiments and calculations, we devise some formulas to be enough to presume the true amount of produced coal dust accompaning with coal mining in the long wall working face. With this method we can easily calculate the total amount of coal dust during a con, tant time, and then the 'amount of coal dust per one ton of coal mining. This figure gives an important idea for the prevention of coal dust explosion in coal mine.
Some of the important formulas for the calculation of true produced coal dust are as follows:-Wt=α· WL· L/1-e-α L α=4.6/L log10 (WL/W
L/2-1) where Wt=Total amount of produced coal dust during t hours.
WL, W
L/2=Total amount of suspending coal dust passed at the end and the middle of a long wall working face during t hours.
L=Length of the working face.
α=Coefficient of dust settling per unit distance.
Supposing the amount of coal exploited during this t hours is C tons, the amount of produced coal dust per one ton of coal mining, K, is given by the next formulas. K=WL· L/C·α/1-e-α L
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