空気分級における分級精度について

概要

論文の詳細を見る
The classification method by pneumatic sieve has been developed to eliminate fines in ores charged into blast furnaces. When particles are supplied into air stream upward, smaller particles float up and larger one sink down. In this method, the apparent specific weight, the drag ccefficient of the particles, and the interference of moving particles in the air stream (especially between floating-up and sinking-down particles) affect the classification accuracy. In this paper, the above effects are experimentally and theoretically discussed. Conclusions are as follows ; (1) The classification by pneumatic sieve is available with the difference of flcating velocity of particles, even if apparent specific weight and drag coefficient scatter in some extent. (2) The scattering of apparent specific weight and drag coefficient affects the classification accuracy significantly for the particles of diameter nearly equal to the floating particle diameter D_s and negligibly for the particles of diameter less than half of D_s. (3) For the classification of particles in the same particle size distribution, the weight ratio in each size range of floating-up particles to supplied one decreases logarithmically with increasing mixing ratio M.
社団法人日本鉄鋼協会の論文
1970-05-01