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Full-Text Articles in Mining Engineering

Surface Properites Of Coal And Their Effects On The Selective Oil Agglomeration Process , Xiaoping Qiu Jan 1992

Surface Properites Of Coal And Their Effects On The Selective Oil Agglomeration Process , Xiaoping Qiu

Retrospective Theses and Dissertations

The heat of immersion of coal in water and various organic liquids provides a useful means for characterizing the surface of the material, while the oil-water-coal, three-phase contact angle provides a characterization of the coal surface as well as the interactions among oil, water, and coal. Such characterizations may provide an indication of how well the coal will respond to cleaning by the froth flotation and oil agglomeration methods which are controlled by the surface properties of the material;The heat of immersion of two types of coal in water and in several different organic liquids was determined with a ...


An Analysis Of The Kinetics For Oil Agglomeration Of Coal , David Tyson Jan 1990

An Analysis Of The Kinetics For Oil Agglomeration Of Coal , David Tyson

Retrospective Theses and Dissertations

In batch tests with graphite, 2 min. were required to produce a maximum shift towards larger particle sizes in the distribution curves for a stirring speed of 21,000 rpm, slurry concentration of 2 wt%, and oil dosage of 10 v/w%. For a stirring speed of 650 rpm, 4 min. were required for the maximum shift. When the oil was pre-emulsified and then added to the slurry, the maximum shift required 1 min. at 650 rpm. In all these cases, the distribution curves showed particle size reductions after their maximum shift. In the case of 650 rpm, the shift ...


Resource Recovery From Wastewater Treatment Sludge Containing Gypsum, L.L. Smith, M.L. Fortney, C.E. Morris, Thomas D. Wheelock, J.A. Carrazza Jan 1984

Resource Recovery From Wastewater Treatment Sludge Containing Gypsum, L.L. Smith, M.L. Fortney, C.E. Morris, Thomas D. Wheelock, J.A. Carrazza

Chemical and Biological Engineering Conference Presentations and Proceedings

The disposal of wastewater treatment sludge generated at the Radford Army Ammunition Plant (RAAP) is a serious problem. The sludge is produced by neutralizing spent acid contained in the wastewater with lime, and consists principally of very finely divided wet gypsum (calcium sulfate dihydrate). Although the sludge is presently being disposed of in a landfill, the sludge is difficult to handle and convert into a load-bearing material. Therefore an alternative method of disposal is being developed and evaluated.

The alternative method involves drying and granulating the sludge, followed by high temperature calcination in a fluidized bed reactor to recover usable ...


Evaluation Of The Removal Of Organic Sulfur From Coal, R. Markuszewski, L.J. Miller, W.E. Straszheim, C.W. Fan, Thomas D. Wheelock, R.T. Greer Jan 1981

Evaluation Of The Removal Of Organic Sulfur From Coal, R. Markuszewski, L.J. Miller, W.E. Straszheim, C.W. Fan, Thomas D. Wheelock, R.T. Greer

Chemical and Biological Engineering Publications

As the removal of sulfur from coal prior to combustion acquires more importance in order to meet evermore stringent antipollution regulations, research on the development of methods for the cleaning of coal continues to expand. Reviews are available which describe the various methods for desulfurizing coal (1, 2, 3). The sulfur content in coal is usually a few per cent, but it can range from less than 0.5 per cent to as much as 8 per cent or more. Much of the sulfur is inorganic in nature, occurring in discrete mineral phases; the inorganic sulfur is mostly pyrite with ...


A Mathematical Model Of The Chemistry Of The Dump Leaching Of Chalcopyrite, Knona Constance Liddell Jan 1979

A Mathematical Model Of The Chemistry Of The Dump Leaching Of Chalcopyrite, Knona Constance Liddell

Retrospective Theses and Dissertations

No abstract provided.