Evaluation of cement production using a pressurized fluidized-bed combustor
There are several primary conclusions which can be reached and used to define research required in establishing the feasibility of using PFBC-derived materials as cement feedstock. 1. With appropriate blending almost any material containing the required cement-making materials can be utilized to manufacture cement. However, extensive blending with multiple materials or the use of ash in relatively small quantities would compromise the worth of this concept. 2. The composition of a potential feedstock must be considered not only with respect to the presence of required materials, but just as significantly, with respect to the presence and concentration of known deleterious materials. 3. The processing costs for rendering the feedstock into an acceptable composition and the energy costs associated with both processing and burning must be considered. It should be noted that the cost of energy to produce cement, expressed as a percentage of the price of the product is higher than for any other major industrial product. Energy consumption is, therefore, a major issue. 4. The need for conformance to environmental regulations has a profound effect on the cement industry since waste materials can neither be discharged to the atmosphere or be shipped to a landfill. 5. Fifth, the need for achieving uniformity in the composition of the cement is critical to controlling its quality. Unfortunately, certain materials in very small concentrations have the capability to affect the rate and extent to which the cementitious compound in portland cement are able to form. Particularly critical are variations in the ash, the sulfur content of the coal or the amount and composition of the stack dust returned to the kiln.
- Research Organization:
- Gilbert/Commonwealth, Inc., Reading, PA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC21-89MC25177
- OSTI ID:
- 10159228
- Report Number(s):
- DOE/MC/25177--3720; ON: DE94004108; BR: 39AA00000/AA0510000
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
014000
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305
ASHES
CEMENTS
CHEMICAL COMPOSITION
COAL
COMBUSTION
ENERGY CONSUMPTION
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
INDUSTRIAL WASTE MANAGEMENT
INFORMATION NEEDS
PRODUCTION
QUALITY CONTROL
RECOMMENDATIONS
REFUSE DERIVED FUELS
SPECIFICATIONS
WASTE PRODUCT UTILIZATION