Determination of pelletizing properties after calcination of Hekimhan - Deveci siderite ore

In this study, the pelletization characteristics after calcination of the MalatyaHekimhan-Deveci siderite ore were investigated and the productivity of pellets with higher strength than that obtained from crude siderite was investigated. Calcination experiments were carried out at temperatures ranging from 450 to 800oC and for periods ranging from 5 to 60 minutes by using thermogravimetric analysis (TGA) data of the siderite sample. It was detected by XRD that after calcination siderite transformed predominantly to hematite. Apart from the conventional method, in calcination experiments made with 30% thermal assist (sucrose) additive by microwave heating method, a temperature of 1100 ° C was reached with 3 minutes irradiation and 32.14% weight loss was detected. Various calcined siderites obtained by calcination were sieved for different durations (1590 minutes) and their grindability was investigated. It was observed that calcined siderite was much easier to grind than raw siderite. Green ball produced from calcined and uncalcined siderite ore by adding bentonite to various ratios were heated at 1300 oC. It was found that the pellets with the highest strength (268 kgf approximately 2630 N) was obtained with the calcined siderite ore grounded for 90 minutes by addion of 9% bentonite. The surface structure of produced pellets by addition of various ratios bentonite was tried to be clarified by SEM images.