| 초록 |
Recently, FeCr alloy is one of the most significant resource in the steel producing company. This ferrochromium alloy is being produced through the reduction process of chromium ore mostly. In maximum cases, the chromium ore is being reduced by the smelting process using electric furnace. On the other hand, high-purity silicon ingots are being sliced during manufacturing disks which generates silicon sludge as the waste. Normally, the Si sludge consists of cutting oil, cooling water, silicon, silicon carbide and iron particles overwhelmingly. The Si sludge can be used to develop environmental friend and low-cost process for FeCr alloy production. In this study, an approach is presented for reducing the chromite ore with the help of silicon sludge. The mixture of chromium ore and silicon sludge were pressed to make pellets. Then, the pellets were dried at 90-100ºC for 3-4 hours. The pellets were dropped into the MgO crucible held at 1350~1500 ºC with the flow of high purity argon and subjected to the reaction. The CO and CO2 in off-gas were analyzed using the gas analyzer during the experiment. The metal and slag samples were recovered and their phases and chemical composition were analyzed precisely with various experimental tools such as X-ray Fluorescence (XRF), X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) and Energy Dispersive Spectroscopy (EDS). The reaction ratio was examined according to various reduction temperature and additives. The cordierite phase was found mainly in the slag samples. The metal droplets were coalesced easily at higher reduction temperature. The results can provide precious information on the reduction of chromium ore by the silicon sludge, resulting in the ferrochrome alloy. |
