Use of precalciners to remove alkali from raw materials in the cement industry. Quarterly technical progress report, November 1979-January 1980
Experiments using the sulfate fusion technique have continued. High degrees of alkali removal have been achieved using CaSO/sub 4/ admixtures with added CaCl/sub 2/ and Mg(NO/sub 3/)/sub 2/. The presence of Mg/sup 2 +/ or Cl/sup -/ in the mixtures did not affect the phase separation significantly. There was considerable evidence for preferential migration of K/sup +/ into the sulfate phase, relative to Na/sup +/. A new technique, the powder drop method, was used to attempt to more closely simulate the alkali removal reactions which would occur in a reactor. Rapid removal of K/sup +/ from most minerals was shown to occur with a sulfate melt initially containing 20% Na/sub 2/SO/sub 4/ and 80% CaSO/sub 4/. However, in most cases, the Na/sup +/ content of the slag layer actually increased.
- Research Organization:
- Portland Cement Association, Skokie, IL (USA). Construction Technology Labs.
- DOE Contract Number:
- EM-78-C-02-4929
- OSTI ID:
- 5602497
- Report Number(s):
- DOE/CS/40061-6
- Country of Publication:
- United States
- Language:
- English
Similar Records
Use of precalciners to remove alkalies from raw materials in the cement industry. Quarterly technical progress report, February--April 1979
Use of precalciners to remove alkali from raw material in the cement industry. Quarterly technical progress report, May-June 1979
Related Subjects
CEMENT INDUSTRY
RAW MATERIALS
CEMENTS
HYDROXIDES
REMOVAL
CALCIUM CHLORIDES
CALCIUM SULFATES
CHLORINE IONS
ENERGY CONSERVATION
MAGNESIUM IONS
MAGNESIUM NITRATES
MIXTURES
POTASSIUM IONS
SODIUM IONS
SODIUM SULFATES
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ATOMIC IONS
BUILDING MATERIALS
CALCIUM COMPOUNDS
CALCIUM HALIDES
CHARGED PARTICLES
CHLORIDES
CHLORINE COMPOUNDS
DISPERSIONS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INDUSTRY
IONS
MAGNESIUM COMPOUNDS
MATERIALS
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
SODIUM COMPOUNDS
SULFATES
SULFUR COMPOUNDS
320303* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Equipment & Processes