Research Information System
1. INTERNATIONAL TECHNOLOGICAL SCIENCES AND DESIGN SYMPOSIUM, Giresun, Turkey, 27 - 29 June 2018
Differential thermal analysis (DTA) is universally accepted for metallurgical and materials applications as a rapid and convenient means for recording the thermal effects occurred on sample. In operation, the temperature of the sample and reference material are increased at a constant speed and the temperature difference is monitored as a function of the time or temperature to determine sample material either absorbs or emits heat.
Heat generation or absorption is related to chemical reactions or phase transformation. In this study, thermal dissociation behavior of domestic pyrolusite concentrate is investigated. In this case, three distinctive endothermic peaks observed in the DTA analysis. It is found that, the first two peaks are related to consecutive thermal dissociation of MnO2 to Mn2O3 and later Mn2O3 to Mn3O4. Further increases in temperature up to 1000 °C resulted in calcination of carbonate species. Decreasing carbon content of concentrate from 0.80% to 0.09% after heat treatment clearly indicates that the last reaction is related to calcination of carbonates species. Total of
12.2% weight reduction observed owing to elimination of moisture content, thermal dissociation of higher manganese oxides, and calcination of carbonate species. Thermal dissociation behavior of MnO2 and Mn2O3 is important prior to smelting operations due to oxygen generation. It can be concluded that, decreasing oxygen content of concentrate by heat pretreatment will result lower carbon requirement during ferro-alloy production.