An experimental investigation of hard-to-float fine coal

ABSTRACT

To improve the separation efficiency of hard-to-float fine coal, the properties of coal sample were analyzed, the roughing conditions were explored, and the three different flotation flows were compared. The optimal roughing reagent doses were collector 200 g/t, frother 90 g/t. The separation effect improved after adopting classified flotation, especially the combined process of the flotation machine and the flotation column, recovery increased by 4.15%, and ash decreased by 0.22%. Meanwhile, this process is easily applied in industrial production.

KEYWORDS:

• Characteristic analysis
• classified flotation
• flotation
• fine coal
• hard-to-float

Funding

The author would like to thank the support from the “Key project of science and technology research of Education Department of Henan Province” (Grant No. 17B440003), the “Key project of science and technology research of Education Department of Henan Province” (Grant No. 16A440002), and “The doctoral foundation of Henan Polytechnic University” (Grant No. B2015-13).

Additional information

Funding

The author would like to thank the support from the “Key project of science and technology research of Education Department of Henan Province” (Grant No. 17B440003), the “Key project of science and technology research of Education Department of Henan Province” (Grant No. 16A440002), and “The doctoral foundation of Henan Polytechnic University” (Grant No. B2015-13).