No description available.

Thesis (M.S.)--Ohio University, June, 1987. / Title from PDF t.p.

No description available.

The analytical advantages of some novel approaches to atomisation using gaseous sample transport and slurry nebulization have been investigated and applied to the determination of trace metals in coal. A cold vapour atomic fluorescence spectroscopic method for the determination of mercury using a gas-sheathed atom cell and front surface illumination was developed. With a manual injection technique the detection limit was 0.01 ng. Replacement with a continuous flow system yielded a more rapid and precise method with a detection limit of C.045 ng.ml-1. Quantitative recoveries of mercury from a standard coal were obtained through liberation of the analyte using nonoxidative pyrolysis. Continuous hydride generation methods for the determination of arsenic and selenium using atomic absorption and atomic fluorescence spectrometry were developed.

Thesis (M.S.)--West Virginia University, 2006. / Title from document title page. Document formatted into pages; contains xi, 84 p. : ill. (some col.). Includes abstract. Includes bibliographical references.

Thesis (M.S.)--West Virginia University, 2007. / Title from document title page. Document formatted into pages; contains x, 162 p. : ill. (some col.), maps (some col.). Includes abstract. Includes bibliographical references (p. 160-162).

Recent interest in producing superclean coal has lead to the development of coal cleaning techniques which require the grinding of coal to sizes below 10 microns. Coal in this size range has inherent material handling problems, most of which can be eliminated by the utilization of this ultrafine coal in a slurry form. Ultrafine coal-water slurries, prepared from an Eastern bituminous coal, are investigated to determine the effect of size distribution on slurry rheology. The effect of reagent addition on slurry rheology is normalized by conducting experiments at optimum additions determined to maximize particle dispersion. As a result of this investigation, it has been found that the maximum solids loading for ultrafine coal slurries ranges from 55 to 60 percent by weight as compared to 70 to 75 percent solids reported for coarser slurries. It was further shown that as particle size decreases there is an increase in slurry viscosity and a corresponding decrease in maximum solids loading. Continued analysis in view of a suspension viscosity model (Lee, 1970) yields unsatisfactory predictions as compared to the experimental results. Modification of this model by incorporating a volume correction factor improves the correlation between model predictions and experimental results. The volume correction factor reflects an increase in apparent solids loading which becomes greater as the particle size decreases. Also investigated is the effect of various reagents on the rheology of ultrafine coal slurries. Pseudoplastic or dilatant slurry rheologies are shown to be more dependent upon dispersing reagent than the size distribution. / M.S.

Thesis (M.S.)--Ohio University, June, 1986. / Title from PDF t.p.

The water quality characteristics of a coal slurry were found to vary widely, depending upon the coal used and the use of a corrosion inhibitor. The coal-water interactions were evaluated in a pilot-plant closed-loop coal slurry pipeline. Pulverized coal from eastern Kentucky and tap water were slurred and pumped through a 40 foot (12.2 m) pipe loop for ten days. Slurry samples were collected at 3 hours, 7 hours, 1 day, 2 days, 4 days, 7 days and 10 days from the start of a run. The samples were filtered and analyzed for 29 water quality parameters, including 15 metals. Two runs were performed without adding a corrosion inhibitor and two runs were performed with the addition of a corrosion inhibitor. The coal slurry filtrate contained high levels of sulfates, total dissolved solids, conductivity, acidity, iron, magnesium, manganese, lead and aluminum. The pH dropped initially, depending upon the percent sulfur in the dry coal and the alkalinity in the slurry, but returned to 6-7 after 10 days in the pipeline. Metal concentrations were a function of the pH, which affected solubility. Organics in the filtrate were at low levels. The addition of a corrosion inhibitor increased the concentrations of most parameters.

A complete wastewater characterization study was performed on an eastern Kentucky coal slurry after a 10-day circulation period in a 40 foot (12.2 m) pilot-scale pipeline. The resulting wastewater was settled and decanted for additional lime and alum treatability studies. Easter coal slurries were characterized by high TDS, conductivity, sulfates and iron. Significant concentrations of a number of trace metals were also found; however, organics were very low. Wastewater quality varied considerably among several experiments and was presumed to be influenced by different properties of the coal and the addition of a corrosion inhibitor. The major treatment concern was removal of high concentrations of iron, manganese, and trace metals if wastewaters were to be discharged. Lime treatment was found to effectively remove iron, magnesium, manganese and many other trace metals from coal slurry wastewaters. Alum treatment methods were considerably less effective for metals removal; however, alum was more effective in removing organics, color and turbidity. The addition of a corrosion inhibitor was found to reduce treatment removals for both lime and alum treatment. Several alternative uses were proposed for slurry wastewaters based on predicted water quality and volumes.