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Waste Management & Research
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*Compound via MeSH
*Substance via MeSH
Hazardous Substances DB
*BENTONITE
*CALCIUM CHLORIDE
*CALCIUM HYDROXIDE
*IRON
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What's this?

Effects of calcium hydroxide and calcium chloride addition to bentonite in iron ore pelletization

Nurcan Tugrul

Department of Chemical Engineering, Yildiz Technical University, Esenler, Istanbul, Turkey, ntugrul{at}yildiz.edu.tr

Emek Moroydor Derun

Department of Chemical Engineering, Yildiz Technical University, Esenler, Istanbul, Turkey

Mehmet Piskin

Department of Chemical Engineering, Yildiz Technical University, Esenler, Istanbul, Turkey

Pyrite ash is created as waste from the roasting of pyrite ores during the production of sulphuric acid. These processes generate great amounts of pyrite ash waste that is generally land filled. This creates serious environmental pollution due to the release of acids and toxic substances. Pyrite ash waste can be utilized in the iron production industry as a blast furnace feed to process this waste and prevent environmental pollution. The essential parameters affecting the pelletization process of pyrite ash were studied using bentonite as a binder. Experiments were then carried out using bentonite and a mixture of bentonite with calcium hydroxide and calcium chloride in order to make the bentonite more effective. The metallurgical properties of pyrite ash, bentonite, calcium hydroxide, calcium chloride, a mixture of these and sintered pellets were studied using X-ray analysis. The crushing strength tests were carried out to investigate the strength of pyrite ash waste pellets. The results of these analyses showed that pyrite ash can be agglomerated to pellets and used in the iron production industry as a blast furnace feed. The crushing strength of the pellets containing calcium hydroxide and calcium chloride in addition to bentonite was better than the strength of pellets prepared using only bentonite binder.

Key Words: Pyrite ash • pellet • binder • bentonite • pelletization • wmr 957-9

Waste Management & Research, Vol. 24, No. 5, 446-455 (2006)
DOI: 10.1177/0734242X06066119
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