Mineralogical characterization of a lignite gasification ash from a low-BTU fixed-bed gasifier II. Scanning electron microscope phase analysis
✍ Scribed by Robert J. Stevenson
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 655 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0008-8846
No coin nor oath required. For personal study only.
✦ Synopsis
A lignite coal ash produced in a Iow-BTU fixed-bed atmospheric pressure gasifier has been studied by scanning electron microscopy using both imaging and chemical analytical techniques.
The primary phases of the dominantly crystalline ash are Ca-Mg-Na-Al-silicates (melilite, merwinite, two C2S phases including bredigite, and nepheline/carnegieire) and oxides (ferrite spine], quartz, periclase, and hematite). Additional secondary phases (calcite, portlandite, brucite, thenardite, ettrigite, gypsum, and goethite) apparently formed by reaction with water or precipitation from solutions used in ash handling.
The individual grains of ash proved to he variable in bulk composition and mineralogic content. * Number of point analyses ** Standard deviation shown in parentheses