高濃度乾式分級 (I)
垂直型とジグザク型の高濃度分級特性
1971 年 8 巻 6 号 p. 417-421
詳細
1971 年 8 巻 6 号 p. 417-421
As the sharpness of air classification generally decreases with the increase of the solid concentration, or mixing ratio namely, the ratio of solid feed rate to air flow rate, the mixing ratio has been limited to not higher than 0.3 in real industrial operations. Accordingly, besides improving the sharpness, the classification with much higher concentration flow has been required for increasing the throughput of classifiers.
In this report, the fractional recovery curve was investigated by using a vertical type and two kinds of zig-zag type classifiers in fairly wide range of mixing ratio from 0.06 to 10. The cut size of classification was 270μ.
The results obtained were as follows:
(1) When the mixing ratio is less than 0.1, there is no difference of classification between the vertical type and the zig-zag type, but when the ratio is more than 0.1, the classification with latter type is more sharper than that of the former one.
(2) Comparing the zig-zag types having the inclination of 30 degrees and that of 45 degrees, the former shows the sharper classification than the latter in the case of mixing ratio less than 1.0. However, this trend reverses at the ratio more than 1.0.
