YILDIZ Kenan Sakarya University

Spoluautoři APAYDIN Fatih

Chromite is an oxide of iron and chromium having chemical composition FeO.Cr2O3 and belonging to the spinel group. Ferrochromium is one of the most important alloying materials used in the production of stainless and high-alloy ferritic steels. At present, high-carbon ferrochromium is produced in submerged-arc furnaces. Disadvantages of this process are the limited use of chrome ore fines and friable chrome ores, as well as its dependence on both expensive metallurgical coke and electrical energy. To improve cost effectiveness, solid state carbothermic prereduction has gained importance [1,2]. The mechanical activation of minerals makes it possible to reduce their decomposition temperature or causes such a degree of disordering that the thermal activation may be omitted entirely. The mineral activation leads to a positive influence on the reaction kinetics, an increase in surface area and further phenomena. Mechanical activation by high energy milling is an innovative procedure that improves the efficiency of mineral processing because of several factors, most importantly the formation of new surfaces and the creation of lattice defects [3] In this study, the carbothermal reduction of Turkish chromite with graphite was investigated by using thermal analysis under argon atmosphere up to 1350°C and the effect of mechanical activation on the chromite structure was studied by X-ray diffraction and scanning electron microscopy. LITERATURE [1] WEBER, P., ERIC, R.H. The reduction of chromite in the presence of silica flux, Minerals Engineering, 2006, vol.19, page 318. [2] DING, Y.L., WARNER, N.A., Catalytic reduction of carbon-chromite composite pellets by lime, Thermochimica Acta, 1997, Vol.292, page 85. [3] TUNÇ, T., APAYDIN, F., YILDIZ, K., Effects of mechanical activation on the structure of nickeliferous laterite, Acta Physica Polonica A, 2013, Vol.123, no 2, page 349.

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