STUDY OF LATERITIC IRON ORE COMPOSITE BRIQUETTE REDUCTION WITH VARIATION OF CaO AND Na2CO3 ADDITION USING COAL-BED REDUCTOR

• Main Author: CHRISETYA PUTRI MANDIRA - Nim: 12514034 , ANDHINI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25490
• Institution: Institut Teknologi Bandung

<p align="justify">National industry of steel plays major role as a country development parameter, especially in economic and defense aspects. Indonesia as a developing country requires large number of steel to support infrastructure development. But, the challenge faced currently is resource of primary iron go decreasing in amount by years. Resource and reserve of lateritc iron ore in Indonesia have not been utilized yet optimally so lateritic iron ore is expected to replace primary iron ore. This experiment studies lateritic iron ore reduction with two kind of methods, they are isothermal and isothermal-temperature gradient with variation of CaO and Na2CO3 fluxes. <br /> <br /> <br /> First step of this experiment is lateritic iron ore characterization using X-Ray Diffraction (XRD) and X-Ray Fluoresence (XRF), and analysis of coal by ultimate and proxymate test. Composite briquette consists of dehydroxilated lateritc iron ore, 10% of coal and CaO or Na2CO3. Variation of flux addition are 0%; 2.5%; 5%; 7.5% and 10%. Isothermal reduction is conducted at 1100 °C for 120 minutes, while isothermal-temperature gradient consists of 3 steps. Reduction begin by isothermal heating at 1000 °C for 30 minutes, then the reduction take place gradiently to 1400 °C with rate of increasing temperature 10 °C/min. The final step is reheating isothermally at 1400 °C for 60 minutes. Isothermal reduction does not result metal, but in isothermal-temperature gradient reduction results iron nugget inside the briquette. Reduction product are then analyzed by optical microscope and Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM-EDS). Slag obtained from isothermal-temperature gradient reduction is then analyzed by XRD. <br /> <br /> <br /> Isothermal reduction shows the more addition of flux, the bigger iron metal diameter formed. Addition of 10% CaO and 10% Na2CO3 produce maximum diameter of iron metal 99.05 µm and 94.07 µm. Isothermal-temperature gradient shows the addition of CaO and Na2CO3 have effect for metal recovery. Highest recovery is obtained at the addition of 10% CaO and 10% Na2CO3, those are 41.61% and 85.28%. Iron nugget is formed inside the briquette and does not appear at the surface. CaO added briquette tends to go swelling as CaO addition increased. On the other side, increasing addition of Na2CO3 causes shrinking of briquette. <p align="justify">