噴霧散水による浮遊粉塵の抑制について

Abstract

The author carried out studies, on water spray which is the most familiar for air-borne dust control, and obtained the following results on its effect.1. The larger the nozzle orifice diameter is, the more sufficient efficiency can beobtained, namely, in the diameter of each 3.0, 2.5, 2.0, and 0.8mm, it has time ratio of 1.0, 1.18, 1.45, 3.27 respectively, under the condition of 3.5kg/cm2 of water-pressure to be needed for 70% of dust suppression.2. Effect differs from the kind of rock, and, generally the sedimentary rocks have higher effect than the ignious rocks, but coals are not so high as compared with other rocks.3. The bigger the particle size of air-borne dust is, the higher effect is.4. The higher water pressure is, the higher effect is, and 8kg/cm2 of water pressure will do with water quantity of below 1/4 compared with 2.5kg/cm2.5. When wetting-reagent is used, in 1-2 min. of spray effect can be made ranking anion, cation, and nonion. But in 7-10min. of spray, the order of effect is changed to anion, nonin and cation.6. When wetting-reagent is mixed with water to be used for spray the quantity of water can be reduced by 20-30%.7. Wetting-reagent makes little difference in the effect on the kind of rock.8. Effect is lower in 'the fluidity of the air than in the still.