A STUDY OF REDUCTION OF COPPER SLAG COMPOSITE BRIQUETTE BY COAL TO PRODUCE IRON METAL
Copper slag is one of by-product produced from copper smelting process. Nowadays, copper slag is commercially used as raw material for cement and concrete. On the other hand, copper slag has relatively high content of iron, which is around 35-40%. In one year, at least 650,000 ton of copper slag can...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/49176 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Copper slag is one of by-product produced from copper smelting process. Nowadays, copper slag is commercially used as raw material for cement and concrete. On the other hand, copper slag has relatively high content of iron, which is around 35-40%. In one year, at least 650,000 ton of copper slag can be produced in Indonesia. The availability of copper slag in large and stable amount provides an opportunity for this commodity to be used as an alternative of raw material for iron production. In this study, the experiment of copper slag reduction was conducted to produce iron metal. Copper slag used in this study is taken from PT Smelting Gresik. The result of this experiment is expected to give information on the possibility of utilization of copper slag as alternative raw material for iron production.
A series of experiments was carried out to study the effects of coal addition in composite briquette and reduction temperature on the result of copper slag reduction. The experiment began by mixing 3 grams of copper slag and coal in various amount of 5%, 10%, 15%, and 20% to make composite briquette. The composite briquette was inserted into a porcelain crucible with addition of 5 grams of coal as reductant bed in the crucible, the sample then went through reduction process in a muffle furnace for 145 minutes by isothermal gradient temperature method with an initial temperature of 1000? and final temperatures of 1350?, 1400?, 1450?, and 1500?. Initial analysis was done to calculate the percentage of recovery and size of iron nugget produced from the experiment. Surface analysis and composition analysis of reduction result was done by optical microscope, EPMA-WDS, SEM-EDS, dan XRD. Analysis of slag produced from the experiment was done by SEM-EDS and XRD to identify the content of element and compound in the slag.
Increasing of coal addition in the briquette in amount of 5% to 15% could increase the percentage of iron metal recovery and the size of iron nugget formed, then it decreased in the coal addition of 20%. The percentage of iron recovery and size of iron nugget formed also increased with increasing final isothermal temperature. The highest percentage of metal recovery was obtained from experiment which was carried out in final isothermal temperature of 1500? with coal addition in amount of 15%. In this experiment, the content of silicon was around 7%, so the percentage of metal recovery reached 110.05% (iron recovery = 95%). The highest size of iron nugget was obtained also in experiment which was carried out in final isothermal temperature of 1500? with coal addition in amount of 15%, which was 10.085 mm. |
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