Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Bituminous coal samples, pyritic

Table I. Bituminous Coal Samples and Their Pyritic Sulfur Content... Table I. Bituminous Coal Samples and Their Pyritic Sulfur Content...
Mercury concentrations were highest in lignite coal (0.12mg/kg DW), lowest in sub-bituminous coal (0.03 mg/kg DW) and intermediate (0.07 mg/kg DW) in bituminous coal samples measured. More recent information indicates that coal contains, on an average 0.2 mg Hg/kg and may contain as much as 1.0 mg/kg. Most of the mercury in coal is associated with arsenic-bearing pyrite other forms include organically bound mercurials, elemental mercury, and mercuric sulfides and selenides. In coal samples with low pyrite, mercury selenides may be the primary form. [Pg.426]

Analytical Procedures. The samples of bituminous coals were analyzed for pyritic sulfur, sulfate sulfur and total sulfur using conventional wet chemical procedures adapted from the American Society of Testing Materials (23, 24). The ASTM D 3177-75, The Eschka method was used for the total sulfur, and ASTM D-2492-79was used for sulfate and pyritic sulfur determinations. The treated samples were filtered through a Whatman 2 filter paper to separate the coal particles from the liquid medium. The filtered sample was washed with 0.1 N HCl followed by distilled water to remove traces of absorbed sulfate and iron. [Pg.96]

Another slurry pipeline desulfurization experiment was conducted using Indiana 3 (Ayrshire) coal as a 25 wt% slurry in deionized water. The other process variables were carefully controlled flow rates 6-6.5 ft/sec, temperature 70-90°F, and pH 2.5 -2 8.The experiment was continued for 14 days, and the slurry samples for pyritic sulfur determination were taken daily. The desulfurization rates with Indiana 3 coal in the pipeline experiment are shown in Table 4 and are in good agreement with the laboratory data and the results with Illinois 6 coal. As observed in the laboratory experiments, the rate of desulfurization of bituminous coals is directly proportional to the pyritic sulfur content and inversely to the particle size of the coal sample. [Pg.99]


See other pages where Bituminous coal samples, pyritic is mentioned: [Pg.350]    [Pg.161]    [Pg.244]    [Pg.98]    [Pg.410]    [Pg.467]    [Pg.181]    [Pg.43]    [Pg.322]   


SEARCH



Bitumin

Bituminous

Bituminous coal

Coal sampling

Pyrit

Pyrite

Pyritization

© 2024 chempedia.info