There are many dust determination methods, such as air dust concentration dust measurement method, including filtration, free sedimentation, impact, static agglutination, photoelectric dust measurement, etc.; the determination method of mineral dust dispersion is sieving method, pipette method, sedimentation method, balance method Wait.
Most domestic mines use the filter weight concentration method to measure dust. When the air suction device filters a certain volume of the measured gas through the filter membrane, the dust is retained on the filter membrane, and the incremental value on the filter is the weight of the dust. The dust concentration in the air is calculated by the ratio of the incremental value to the volume of gas passing through.
which is:
g 1 -g O
C = ———1000 mg/m 3
Q·t
Where: C——dust concentration, mg/ m3 ;
g 0 ——the weight of the filter before sampling, in milligrams;
g 1 ——the total weight of the filter and the dust after sampling, in milligrams;
Q——air flow rate during sampling, l/min;
t - sampling time, minutes.
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