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Coolside waste management research. Quarterly report, April 1--June 30, 1994; Progress rept
| 题名： | Coolside waste management research. Quarterly report, April 1--June 30, 1994; Progress rept |
| 关键词： | Ashes; Combined-Cycle Power Plants; Roads; Waste Pellets; California; Chemical Composition; Coal; Coal Gasification; Compression Strength; Experimental Data; Fluidized-Bed Combustion; Foundations; Fracture Properties; Leachates; Leaching; Mechanical Properties; Mineralogy; Pelletizing; Progress Report; Thermodynamics; Waste Management; Waste Product Utilization; Tables(Data) |
| 摘要： | The project objective is to produce sufficient information on the mineralogical and chemical changes of FBC-waste pellets to aid in the design and manufacture of physically stable pellets that can be used toward road applications. FBC-waste pellets were prepared by CONSOL in a disk pelletizer. The FBC-pellets were then characterized for their soundness and freeze/thaw durability. The sample characterization was based on X-ray diffraction and SEM investigations of the pellets and pellet fragments that formed in weathering tests conducted by CONSOL. The results of this combined XRD/SEM study of waste FBC-pellets showed that the majority of the swelling and fracturing process, which occurs when the FBC-pellets are exposed to moisture (natural weathering and freeze/thaw), is not caused by the formation of ettringite crystals, but rather can be contributed to the delayed hydration of anhydrite. The formation of gypsum via hydration of anhydrite results in a volume increase, which may be the main cause for the fracturing of the FBC pellets. In a related study, WATEQ analysis has been extended to include some of the current field lysimeter data. Data extracted for each leachate collection include concentrations of 43 aqueous species, 71 mineral species which appear to approach saturation levels, and various other indicators such as ionic strength, CO(sub 2) partial pressure and species activities. This data, in combination with the leachate analytical data, are being examined to infer the chemistry controlling leachate behavior. Geotechnical characterization of the road base soil stabilization characteristics of the FBC material continued. An 8% addition of FBC material produced a 100% increase in compressive strength and reduced natural swell of the soil by half. Results to date are presented. (ERA citation 19:032163) |
| 总页数： | 47p |
| 报告类型： | 科技报告 |
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