衝撃粉砕に関する基礎的研究
荷重条件による物理的諸量の粉砕効果に及ぼす影響
1954 年 18 巻 4 号 p. 146-153
詳細
1954 年 18 巻 4 号 p. 146-153
Crushing is accomplished by dropping a steel ball on a plunger resting on the samples (Stoneware) in a steel mortar. The experimental results are as follows:
The residue of crushed products R in percent is given by the equation
(I)
R=f(y) (II)
where, x: particle size in mm
σ: max. stress by eq. (17), e: base of natural logarithm
σ0: stat. stress by eq. (17), k, n, c: Constants
A: gross work input to crushing in kgm by eq. (15)
Eq. (1) is applicable in the following cases:
1. Free crushing, in which fines 100 mesh minus are removed.
2. Choke crushing, in which, Residue (100 mesh plus)≥75%
Eq. (2) is applicable in the choke crushing, in which, Residue (100 mesh plus)<75%
We have found close similarity between these equations and the corresponding experimental data, regardless of the ball weight or the drop height.
Comparing these equations with those of Rittinger's, we have proved that the former ones are more useful than the latter ones.
