The Status and Potential of Metals Recovery from Coal Fly Ash by High-Temperature Chlorination

Authors

D. J. Adelman, Iowa State University
G. Burnet, Iowa State UniversityFollow

Document Type

Research

Keywords

Aluminum chloride, chlorination, coal ash, fly ash, waste utilization

Abstract

Coal fly ash is a potential commercial source of aluminum, iron, and titanium. A high-temperature chlorination process (HiChlor) is under development at the Ames Laboratory to remove these metals and purify the products. A reduction-chlorination reaction is used to convert the metal oxides in the fly ash to volatile metal chlorides. Bench scale tests have been conducted by flowing chlorine gas through a horizontal fixed-bed composed of a fly ash-graphite mixture. The amounts of iron, aluminum, titanium, and silicon removed have been determined as a function of reaction time (0.5 to 2 hours) and temperature (750 degrees C to 900 degrees C). On-stream product gas analyses of CO, CO₂, and Cl₂ using a gas chromatograph have permitted calculation of chlorine balances and reaction rates in terms of the O₂ evolution rate. Reaction controls, surface area and particle size distributions as a function of fly ash conversion, and final conversion limitations also have been investigated.

Publication Date

December 1980

Journal Title

Proceedings of the Iowa Academy of Science

Volume

87

Issue

4

First Page

129

Last Page

133

Copyright

©1980 Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

Recommended Citation

Adelman, D. J. and Burnet, G. (1980) "The Status and Potential of Metals Recovery from Coal Fly Ash by High-Temperature Chlorination," Proceedings of the Iowa Academy of Science, 87(4), 129-133.
Available at: https://scholarworks.uni.edu/pias/vol87/iss4/6