The Effect of Some Binders and Their Combinations on the Porosities and Strengths of the Pellets Produced From Magnetite Concentrates

Abstract

In this study, in the pelletizing process of iron ore concentrates in powder form, binding properties of the fly ash, which it is not used pelletizing process of the iron ores currently, and it’s combination together with various binders were investigated. In this purpose, the strength and porosity of the pellets produced using various binders such as calcium bentonite, sodium bentonite, calcium hydroxide (Ca(OH)2), olivine, portland cement and zeolite, have been compared with studies used fly ash as a binder. A part of these binders remained under the standards in terms of porosities, despite the fact that they delivered positive results in terms of strength. In experiments in which fly ash as the binder used alone, although not in the strength, it was concluded that to be used with different binders due to the fact that the pellets had the best porosity. In industrial applications, it is desirable to be a minimum of 250 Kg /pellet for the resistance value of a pellet and the porosity of a pellet is between 22-35%.

It were obtained 328 Kg / pellet strengths and 31.26% porosity when 0.75% fly ash was added in the 1% Na-bentonite. These values show that as a combination of binders may be used in the industrial production of pellets.

Keywords: Binders, Na-Bentonite, Ca-Bentonite, Ca(OH)₂, olivine, portland cement, fly ash, zeolite, pelletizing