IRON EXTRACTION FROM RED MUD USING LDPE AND COAL AT TEMPERATURE 1250 ?C - 1550 ?C IN ARGON ATMOSPHERE (A REVIEW)

• Main Author: Waluya Setiawan S, Ignatius
• Format: Final Project
• Language: Indonesia
• Subjects: Metalurgi
• Online Access: https://digilib.itb.ac.id/gdl/view/49238
• Institution: Institut Teknologi Bandung

Red mud and Low density polyethylene (LDPE) are wastes that pollute the environment. Both types of waste can cause biomagnification effects that affect humans. Red mud is produced from the processing of bauxite into alumina in the Bayer process. Red mud has high alkalinity characteristic (pH 10-13) and iron oxide content ranging from 25% to 70%. It has fine size (similar to dust, average particle size of <10 ?m). Plastic waste in storage causes water pollution until the limit of the storage area and can produce dangerous odor, harmful gases and other hydrocarbons that are formed when burning plastic waste occurs. Microplastic can contaminate the bodies of sea and land creatures when it is accidentally ingested with creature’s food. In Indonesia, the growth of plastic waste in a day reaches 26,302 tons. Currently, around three percent of the world's plastic waste has been used as an additional reducing agent in the blast furnace ironmaking. This study aims to learn the effect of LDPE as a reductant mixture to reduce iron oxide in red mud by reviewing the results of research that has been published scientific, journals, research reports, theses, etc. Research method began firstly with collecting research document that contain keywords: LDPE, red mud, temperature, iron oxide, reduction, coal. Second, irrelevant research documents were eliminated from document list that are being studied. Third, the data were input and the data were analyzed from document list that are being studied. Fourth, compared the data and analysis that had been performed to those of other references. Last, the conclusion was drawn from this study. Results from this study show that the addition of LDPE as mixture for reductor coal reduces coal ash content, reduces sulfur grade in the metal, decreases CO2 emission, decreases coal bed permeability, increases the carbon grade in metal and increases iron recovery until optimum point of 94.9% which is gained when ratio of LDPE:coal is 1:1. Higher operating temperatures supported by slag control at the lowest melting point, will increase the recovery of ferrous metal, where the optimum temperature is 1550oC. From the results of the study it can be recommended to: conduct research on reduction of composite red mud with a mixture of LDPE and coal in a ratio of 1:1, conduct research on red mud reduction at 1550oC, conduct further research about the effect of LDPE and coal addition as reductant in Electric Arc Furnace, and conduct research about slag that is produced from reduction of redmud using LDPE dan coal mixture reductant.