Effect of different grinding conditions on the dissociation and flotation of difficult-to-float coal

ABSTRACT

The recovery of clean coal can be improved through grinding. In this study, grinding and flotation experiments were conducted on difficult-to-float coal. Results show that the particle size obtained from ball milling is finer than that obtained from rod milling. However, the particle size distribution obtained from rod milling is more evenly distributed than that obtained from ball milling. The contact styles of steel rod and steel ball are “line contact” and “point contact,” respectively. Results from the flotation experiments are consistent with those from the orthogonal experiments.

KEYWORDS:

• Density
• floatation
• grinding
• mineral morphology
• size

Funding

The Authors would like to thank the support from “The doctoral foundation of Henan Polytechnic University” (Grant No. B201513), and “Key project of science and technology research of Education Department of Henan Province” (Grant No. 16A440002).

Additional information

Funding

The Authors would like to thank the support from “The doctoral foundation of Henan Polytechnic University” (Grant No. B201513), and “Key project of science and technology research of Education Department of Henan Province” (Grant No. 16A440002).