A proposed process for the desulfurization of finely divided coal by flash roasting and magnetic separation

Fine, H. Alan; Lowry, Michael; Power, Luci A.; Geiger, Gene E.

doi:10.1109/tmag.1976.1059077

Cited by 8 publications

(2 citation statements)

References 7 publications

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“…In 1977, Auburn University and Oak Ridge National Laboratory used air entrainment for the first time to conduct dry high gradient magnetic separation tests on several groups of coal in Pennsylvania, 94% inorganic sulfur and 35% ash were removed when the yield of clean coal was 85%. Since then, researchers in Japan, Sweden and the United Kingdom have also conducted similar tests using different high-gradient magnetic separation devices, the results show that: in dry separation of micron grade coal with high gradient magnetic separator, the removal rate of inorganic sulfur is more than 80%, ash content can be reduced by 50-60%, and the recovery of calorific value is more than 90% [37][38][39].…”

Section: The Development Of Desulfurization By High Gradient Magnetic Separationmentioning

confidence: 99%

Review of Coal-Fired Electrification and Magnetic Separation Desulfurization Technology

Chen

Cao

2019

Applied Sciences

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This paper briefly introduces various methods of coal desulfurization (physical desulphurization, chemical desulfurization, biological desulfurization, etc.) and analyzes some problems existing in each method. The principle and research process of friction electrostatic separation technology and high gradient magnetic separation technology in pre-combustion desulfurization technology are emphatically introduced, and the development trend of coal-fired desulfurization technology in the future is prospected.

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Section: The Development Of Desulfurization By High Gradient Magnetic Separationmentioning

confidence: 99%

Review of Coal-Fired Electrification and Magnetic Separation Desulfurization Technology

Chen

Cao

2019

Applied Sciences

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“…The dry methods may be desirable because they require the lowest initial capital investment and have the lowest maintenance costs of all currently used methods of upgrading fine coal. Some comments (Fine et al, 1976) are acceptable on the practicality of thermal processing, such as pyrosis, flash roasting at low temperatures in an inert atmosphere, followed by magnetic separation. The thermal processes are to transform a small portion of the paramagnetic pyritic particles to ferromagnetic pyrrhotite to facilitate removal of sulfur from pulverized coal by magnetic separation.…”

Section: Introductionmentioning

confidence: 99%

Gravity-Enhanced Magnetic (HGMS) Coal Cleaning

Zhou

Garbett

Boucher

1996

Ind. Eng. Chem. Res.

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For economic and environmental reasons, precombustion magnetic coal cleaning must be performed on dry pulverized coal. Gravity-enhanced high-gradient magnetic separation has been successfully applied to the removal of mineral impurities from coal with a 4-T superconducting solenoid magnet. Under optimum separation conditions obtained in this study, this technique effectively cleans up to 72 wt % of the pyritic sulfur and 44 wt % of the ash content from a typical pulverized coal in a vertically upward airstream rig, and the heating value recovery is 95 wt %. Increasing applied magnetic fields and separator matrix lengths and decreasing superficial gas velocity each individually improve the cleaning performance. The results have indicated that the matrix made of 0.360-mm circular AISI 430 stainless steel wires is the best one for all the matrix grades used. These tests have paved the way for pilot plant trial runs at the power station site to be conducted.

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