Improving the flotation performance of coking coal using the reverse-direct flotation process

ABSTRACT

In order to improve the flotation performance of the coking coal particles, the flotation tests of the coking coal particles were conducted in the direct flotation, reserve flotation, and reverse-direct flotation processes. It was found that the concentrate ash content of coking coal particles was higher than 20%, which cannot be effectively reduced using the direct and reserve flotation processes. However, the flotation concentrate with the ash content of 12.53% can be obtained from the reverse-direct flotation process. In the reverse-direct flotation process, the surface hydrophobicity was reduced with the dextrin and 1-dodecylamine (DDA) addition at the reverse flotation process stage. For the addition of diesel collectors at the direct flotation process stage, the surface hydrophobicity of the coking coal samples was improved.

KEYWORDS:

• Coking coal
• direct flotation
• reverse-direct flotation
• reverse flotation
• surface hydrophobicity

Additional information

Funding

This research was financially supported by Key Supported Discipline of Guizhou Provence (Qian Xuewei He Zi ZDXK[2016]24), National Natural Science Foundation of China (No. 50874107), 2011 Collaborative Innovation Center of Guizhou Province (Qian Jiao he xietongchuangxin zi [2016]02), Liu panshui Normal University creative team (LPSSYKJTD201401), Liupanshui normal university high-level talent opening foundation (LPSSYKYJJ201402), and Guizhou Institutions of Higher Education innovation team (Qian Jiao he rctdz [2015]69).