Abstract
A new ball mill with the grinding chamber of V letter shape (V-type ball mill) was produced as an experiment to improve an ability on fine grinding in a ball mill. The ability and optimum operating conditions of the V-type ball mill were investigated. The V-type mill and balls were made of stainless steel. Sample of quartz was utilized to examine the specific surface area as a function of operating conditions.
The optimum revolution speed of the V-type mill was found to be smaller than that of a conventional ball mill, and to agree approximately with that of V-type mixer. Compared with the ability of the conventional ball mill under optimum operating conditions, the ability of V-type mill was superior to the conventional, the specific surface area by V-type mill was about 30% greater than that by the conventional at the same number of total revolution. The improvement on fine grinding is considered to be attributed to an increase in the effects of mixing and agitating in the V-type mill. We can estimate the effectiveness of the reciprocating motion in addition to the revolution motion of balls and sample for fine grinding by ball mill.
