چکيده
In this research, the effect of goethite on the properties (strength and apparent cracks) of iron ore pellets has been investigated. The purpose of this research is to investigate the destructive effects of goethite on the mechanical characteristics of baked iron oxide pellets. Since goethite is one of the hydrous minerals of iron oxide, when the chemical water is released, it causes microcracks in the pellet.
Considering that one of the most important characteristics of pellets is their mechanical strength, the presence of these microcracks causes the loss of pellet strength. Therefore, in this research, the impact of the goethite mineral present in the hematite concentrate of the Kavian Gohar mine from the Golgohar mineral complex has been investigated and according to the previous studies and structural and thermal analyzes to solve the problem, there are two solutions, including The appropriate thermal regime for baking iron ore pellets containing goethite and the use of organic materials as a suitable additive to remove the micro-cracks and increase the strength number and the fall number have been suggested.
In order to determine the appropriate thermal regime, the thermal analysis test (TGA) has been used, in which the chemical water release range of goethite mineral is 252 to 327 °C and the activation energy is estimated to be 164±6 KJ/mol. By carrying out the designed baking regimens, it has been shown that by increasing the baking temperature up to 1300 degrees Celsius and by choosing the carboxymethylcellulose organic adhesive, the amount of cracks and microcracks in the pellets due to the presence of cellulose chains and creating proper adhesion and correlation between the concentrate particles, the strength number And the number of falls has increased significantly.
Key words: baked iron pellets, goethite, hematite concentrate, heating regime, carboxymethyl cellulose organic adhesive.
