Utilization and recycling of end of life plastics for sustainable and clean industrial processes including the iron and steel industry
Autor: | Chaudhery Mustansar Hussain, Guntamadugu Bhaskar Raju, Sheila Devasahayam |
---|---|
Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
Materials science
Materials Science (miscellaneous) chemistry.chemical_element 02 engineering and technology Raw material engineering.material 010402 general chemistry 01 natural sciences lcsh:TA401-492 Chemical Engineering (miscellaneous) Coal lcsh:TJ163.26-163.5 Energy recovery Waste management Renewable Energy Sustainability and the Environment business.industry 021001 nanoscience & nanotechnology 0104 chemical sciences Incineration Fuel Technology chemistry Iron ore lcsh:Energy conservation Carbon footprint engineering lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology business Carbon Efficient energy use |
Zdroj: | Materials Science for Energy Technologies, Vol 2, Iss 3, Pp 634-646 (2019) |
ISSN: | 2589-2991 |
Popis: | About 400 million tonnes of plastics are produced per annum worldwide. End-of-life of plastics disposal contaminates the waterways, aquifers and limits the landfill areas. Options for recycling plastic wastes include, feedstock recycling, mechanical /material recycling, industrial energy recovery, municipal solid waste incineration. Incineration of plastics containing E-Wastes releases noxious odours, harmful gases, dioxins, HBr, polybrominated diphenylethers and other hydrocarbons. This study focusses on recycling options, in particular, feedstock recycling of plastics in high-temperature materials processing, for a sustainable solution to the plastic wastes not suitable for recycling. Of the 7% CO2 emissions attributed to the iron and steel industry worldwide, ∼30% of the carbon footprint is reduced using the waste plastics compared to other carbon sources, in addition to energy savings. Plastics have higher H2 content, than the coal. Hydrogen evolved from the plastics acts as the reductant alongside the carbon monoxide. Hydrogen reduction of iron ore in presence of plastics increases the reaction rates due to higher diffusion of H2 compared to CO. Plastic replacement reduces the process temperature by at least 100–200 °C due to the reducing gases (hydrogen) which enhance the energy efficiency of the process. Similarly, plastics greatly reduce the emissions in other high carbon footprint process such as magnesia production while contributing to energy. Keywords: Waste plastics, Thermo and thermoset plastics, Iron and steel industry, Feedstock recycling, Carbon sequestration, Energy and emissions savings |
Databáze: | OpenAIRE |
Externí odkaz: |