Abstract

ROSALES-MARIN, Gilberto et al. An experimental study of specific energy consumption and size reduction in ball grinding mill using different types of lifter. Ing. invest. y tecnol. [online]. 2020, vol.21, n.2, e1704.  Epub Nov 13, 2020. ISSN 2594-0732.  https://doi.org/10.22201/fi.25940732e.2020.21n2.020.

In this paper, a polymetallic mineral sample with a grade of copper (0.65 %), lead (1.3 %) and zinc (2.3 %) is subjected to size reduction using a ball mill. Four types of lifters were designed with variations in height (h) and angle (α). Grinding kinetics were performed using times of 5, 10 and 15 min with each type of lifter. An additional test has been performed without considering any type of lifter. The study shows that in general, the lifters magnify the grinding, due, the lifters generate the cataract and waterfall streams, this type of streams generate the impact and abrasion grinding mechanisms. The analysis of the number of fines obtained against the specific energy, demonstrates that without any type of lifter the grinding is given by the abrasion mechanism, which generates a slow mineral fracture. The grinding kinetics using lifters denote that Lifter IV (α = 22.5 °; h = 12 mm) has the best efficiency in grinding balls, due, the energy consumption of 9.69 kWh/ton and produces the highest number of fines (32 %) of the proposed lifters. The height and the angle of the lifter are parameters that should be considered for future designs of this type of internal grinding ball attachments, due the produced effect is significant.

Keywords : Ball mill; lifter geometry; size reduction; mineral processing; charge profile.

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