Study on the modification of the coarse coal-slime separation process in Lv-jiatuo coal preparation plant

ABSTRACT

A modification coarse coal-slime separation process used three-stage cone water-only cyclones (TWOCs) as the main separating equipment was designed and evaluated for Lv-jiatuo coking-coal preparation plant. Laboratory experiment was performed to guide the parameters determination of the industrialness TWOC. The industrialess TWOC is expanded five times according to the equal proportion of the laboratory TWOC. The stability of the modification system is obviously higher than that of the original system, the optimal parameters combination of the industrialness TWOC was determined as 500 mm cylinder height, 225 mm vortex finder, 267 mm insertion-depth of the vortex finder and 0.08 MPa feed pressure. After the modification, the clean-coal ash decreases from about 13.00% to 11.45%, the separation density (δ₅₀) and possibility deviation (E_P) value of the TWOC are 1.49 and 0.085 g/cm³, respectively. Plant’s yearly profit increases 13.54 million Chinese yuan (CNY), the static investment recovery period is 0.22 years.

KEYWORDS:

• Coarse coal-slime
• modification process
• three-stage cone water-only cyclone
• industrialness experiment
• stability

Acknowledgments

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

Disclosure statement

No potential conflict of interest was reported by the author(s).