Fine grinding and flotation to desulfurize coal

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:6486108

Miller, K J

Because of the growing need to develop new technology for producing superior quality coals to replace oil and natural gas, the US Department of Energy's Coal Preparation Division is looking at fine grinding and multistage flotation processes to maximize the liberation and removal of sulfur-bearing and ash-forming mineral matter from coal. The beneficiation of micronized coal by froth flotation has long been considered unsatisfactory because of poor product quality and/or poor recovery. However, our current work suggests that superclean products of high yield can be obtained by a combination of coarse coal cleaning or rougher flotation, followed by wet grinding and recleaning by second-stage coal flotation. For example, by a combination of rougher flotation, wet grinding of the rougher concentrate, and two-stage flotation of the wet-ground product, an Upper Freeport bed coal sample was cleaned from 26% ash and 1.1% pyritic sulfur to 4.5% ash and 0.1% pyritic sulfur. 6 refs.

• Research Organization: USDOE Pittsburgh Energy Technology Center, PA
• OSTI ID: 6486108
• Report Number(s): CONF-851047-2; ON: DE87011813
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010300* -- Coal
Lignite
& Peat-- Preparation-- (1987-)
010402 -- Coal
Lignite
& Peat-- Purification & Upgrading
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COAL PREPARATION
COMMINUTION
DEASHING
DESULFURIZATION
DIAGRAMS
ENERGY SOURCES
FLOTATION
FLOWSHEETS
FOSSIL FUELS
FUELS
GRINDING
MACHINING
MATERIALS
SEPARATION PROCESSES