Utilization of pyrite ash wastes by pelletization process

• Published in: Powder technology 2007-07, Vol.176 (2), p.72-76
• Main Authors: Tugrul, Nurcan, Moroydor Derun, Emek, Piskin, Mehmet
• Format: Article
• Language: English
• Subjects: Applied sciences; Bentonite; Binder; Chemical engineering; Exact sciences and technology; General treatment and storage processes; Miscellaneous; Pellet; Pelletization; Pollution; Pyrite ashes; Solid-solid systems; Waste; Wastes
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2007.01.012

In Turkey, pyrite, copper melting gases and sulfur are used as a raw material in sulfuric acid production. Pyrite ashes are obtained as a result of the sulfuric acid production process during the roasting of pyrite ores. These wastes are generally landfilled or dumped into the sea. Pyrite ash wastes can be utilized as a raw material in the production of iron ore, and thus environmental pollution can be avoided; however, these wastes need to achieve certain physical and chemical properties before they are used. Pyrite ashes are agglomerated into pellets to allow them acquire the required properties for use as iron ore in a blast furnace. The essential parameters affecting the pelletization of pyrite ashes are studied using bentonite as a binder. The metallurgical properties of pyrite ash, bentonite, a mixture of pyrite ash and bentonite, and sintered pellets are studied using X-ray analyses. Wet-drop, wet-crush, dry-crush and sintered-crush tests are carried out to investigate the strength of the pyrite ash wastes pellets prepared from feeds with different sieve size and bentonite content. The results of this analysis demonstrate that pyrite ashes can be agglomerated into pellets and used as feed for the blast furnace in the iron production industry. Pyrite ashes can be utilized in iron ore production industry as a raw material and thus environmental pollution can be avoided; however, first these wastes should gain certain physical and chemical properties. Pyrite ashes are agglomerated into pellets to let them acquire the required dimensions and properties in order to be able to use them as iron ore in blast furnace. [Display omitted]