Evaluation of a laboratory rod mill when grinding bituminous coal

Hoon Lee, Mark S. Klima, Paul Saylor

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Laboratory testing was conducted to evaluate the breakage of bituminous coal in a rod mill. A Pittsburgh seam coal, which had been obtained from the product stream of an operating coal cleaning facility, was used as the feed material. This material had an ash value of 6.7% and had been crushed to a nominal -6.35 mm. Grinding tests were carried out on a mono-size (2.38 × 1.68 mm) fraction. The tests were conducted using a 193.5 mm diameter and 245.0 mm long laboratory rod mill, which contained steel rods at a volume loading of 23%. The mill was operated at 70% of critical speed for various grind times. A locked-cycle test was also performed to simulate continuous grinding conditions. The grinding was characterized using the population (or size-mass) balance model. The breakage distribution and rates of breakage were determined from the grinding data. The results indicated first-order breakage. The locked-cycle results indicated that steady state was achieved in several iterations. The simulated results matched the experimental results very well.

Original languageEnglish (US)
Pages (from-to)116-121
Number of pages6
JournalFuel
Volume92
Issue number1
DOIs
StatePublished - Feb 1 2012

Fingerprint

Grinding mills
Coal
Bituminous coal
Ashes
Coal breakage
Coal preparation
Steel
Testing

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

Cite this

Lee, Hoon ; Klima, Mark S. ; Saylor, Paul. / Evaluation of a laboratory rod mill when grinding bituminous coal. In: Fuel. 2012 ; Vol. 92, No. 1. pp. 116-121.
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Evaluation of a laboratory rod mill when grinding bituminous coal. / Lee, Hoon; Klima, Mark S.; Saylor, Paul.

In: Fuel, Vol. 92, No. 1, 01.02.2012, p. 116-121.

Research output: Contribution to journalArticle

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AB - Laboratory testing was conducted to evaluate the breakage of bituminous coal in a rod mill. A Pittsburgh seam coal, which had been obtained from the product stream of an operating coal cleaning facility, was used as the feed material. This material had an ash value of 6.7% and had been crushed to a nominal -6.35 mm. Grinding tests were carried out on a mono-size (2.38 × 1.68 mm) fraction. The tests were conducted using a 193.5 mm diameter and 245.0 mm long laboratory rod mill, which contained steel rods at a volume loading of 23%. The mill was operated at 70% of critical speed for various grind times. A locked-cycle test was also performed to simulate continuous grinding conditions. The grinding was characterized using the population (or size-mass) balance model. The breakage distribution and rates of breakage were determined from the grinding data. The results indicated first-order breakage. The locked-cycle results indicated that steady state was achieved in several iterations. The simulated results matched the experimental results very well.

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