THE TRANSFORMATION OF AUTOMOTIVE INDUSTRIAL WASTE TO USEFUL IRON COMPOUNDS
Keywords:
Sustainable waste management, iron, automotive industry, solubility, alternative chemical compoundAbstract
Automobiles are an important factor for the performance of everyday activities, facilitating human transportation. As a result, Thailand’s automotive industry is growing rapidly to meet the demand for automobiles, resulting in a high production rate. The disadvantage of large-scale production is an increase in automotive industrial waste in large amounts of 50-60 tons per year. Landfill is used as a traditional form of industrial waste management with an exchange rate of 1,800 baht per ton. In this work, the automotive industrial waste (Thailand source) was studied and used as a precursor to prepare a new chemical compound. The X-ray diffraction (XRD) analysis of the automotive industrial waste used in the study as first priority pointed to a rich source of Fe-iron and Fe2O3. The contaminated matter in waste is washed with water and removed by using a magnet. Hydrochloric acid (HCl) and nitric acid (HNO3) react with the automotive industrial waste to form a new chemical compound of iron. For HCl acid, the phases of Fe-iron and Fe2O3 change their composition to form a new composition of FeCl2.4(H2O). FeCl2.4(H2O) shows high solubility in water with the value of 0.1 g/L at room temperature. For HNO3 acid, the phase of Fe-iron changes the composition to form a new phase of Fe2O3 which is insoluble in water. From the results, the new products (FeCl2.4(H2O) and Fe2O3) of automotive industrial waste can be utilized as a flocculant in wastewater treatment, a starting material for magnetic ceramics, coatings for drug delivery for anti-cancer drugs, and so on. The results suggested that the reworked automotive waste served to reduce waste and the environmental impact, and to add value to automotive waste from the automotive parts industry.
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