Recycling of Plastic Waste in Blast Furnace.

Asanuma, Minoru; Ariyama, Tatsuro; Yamada, Yutaka; Fujii, Mitsuhiro; Okochi, Iwao; Sumigama, Takashi; Tokuda, Masanori

doi:10.3775/jie.77.423

Cited by 19 publications

(9 citation statements)

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“…1,2) Concretely, it is a recycling process in the blast furnace and the coking furnace. Authors in addition to this worked on the basic research into the recycling of the wood biomass.…”

Section: Introductionmentioning

confidence: 99%

Carbonization Behaviour of Woody Biomass and Resulting Metallurgical Coke Properties

et al. 2008

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“…1,2) Concretely, it is a recycling process in the blast furnace and the coking furnace. Authors in addition to this worked on the basic research into the recycling of the wood biomass.…”

Section: Introductionmentioning

confidence: 99%

Carbonization Behaviour of Woody Biomass and Resulting Metallurgical Coke Properties

et al. 2008

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“…Feedstock recycling, e.g., monomerization, blast furnace feedstock recycling, coke oven chemical feedstock recycling, gasification, liquefaction, etc. (Garfort et al 2004;Kim et al 2002;Kaminsky et al 2004;Kato et al 2003;Okuwaki 2004;Asanuma and Ariyama 2004) 3. Energy recovery, e.g., cement kilns, waste power generation, refuse-derived fuel (Yamakita et al 2005;Xiao et al 2007) Among these recycling methods, mechanical recycling is only applicable to industrial plastics wastes and some particular waste plastics generated in households, e.g., polyethylene terephthalate (PET), because mechanical recycling requires clear separation of different types of resins with a low level of impurities.…”

Section: Introductionmentioning

confidence: 99%

CO2 reduction potentials by utilizing waste plastics in steel works

Sekine

Fukuda

Kato

et al. 2009

Int J Life Cycle Assess

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Background, aim, and scope Feedstock recycling has received attention as an effective method to recycle waste plastics. However, estimating the reduction potential by life cycle assessment using coke oven and blast furnace in steel works has been a challenging task due to the complex structure of energy flow in steel works. Municipal waste plastics consist of several plastic resins. Previous studies have generally disregarded the composition of waste plastics, which varies significantly depending on the geographical area. If the reduction potentials by using each plastic resin in steel works can be quantified, the potential of municipal waste plastics (mixtures of plastic resins) can be estimated by summing up the potential of each resin multiplied by the composition of each resin in municipal waste plastics. Therefore, the goal of this study is to investigate the reduction potentials of CO 2 emissions by using individual plastic resins (polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET)) and those for municipal waste plastics in the coke oven and blast furnace. Materials and methods A model was developed to clarify the energy flow in steel works. In order to estimate the changes in energy and material balance in coke ovens when waste plastics are charged, the equations to calculate the coke product yield, gas product yield, and oil product yields of each plastic resin were derived from previous studies. The Rist model was adopted to quantify the changes in the inputs and outputs when plastics were fed into a blast furnace. Then, a matrix calculation method was used to calculate the change in energy balance before and after plastics are fed into a coke oven. Results It was confirmed that product yields of municipal waste plastics (mixtures of plastic resins) could be estimated by summing up the product yield of each plastic resin multiplied by the composition of each resin in municipal waste plastics. In both cases of coke oven and blast furnace feedstock recycling, the reduction potential of CO 2 emissions varies significantly depending on the plastic resins. For example, in the case of coke oven chemical feedstock recycling, the reduction potential of PS and PP is larger than that of PE. On the other hand, in the case of blast furnace feedstock recycling, PE has the largest CO 2 emissions reduction potential, whereas the CO 2 emission reduction potential of PP is smaller than those of PE and PS. In both cases, PET has negative CO 2 emission reduction potentials, i.e., there is an increase of CO 2 emissions. In addition, the reduction potentials of CO 2 emissions are slightly different in each city. Discussions The differences in the reduction potentials of CO 2 emissions by coke oven chemical feedstock recycling of each plastic resin is attributable to the differences in calorific values and coke product yields of each plastic resin. On the other hand, the difference in the CO 2 emission reduction potential for each plastic resin in blast furnace feedstock recycling is att...

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“…1 On the other hand, the coking process is considered to be suitable as a waste plastic recycling facility because the process involves coal carbonization at a high temperature under a reducing atmosphere. So carbonization tests of coal mixed with waste plastics were conducted with laboratory equipment and in actual coke ovens.…”

Section: Introductionmentioning

confidence: 99%

Waste plastics recycling process using coke ovens

Kato

Nomura

Uematsu

2003

Journal of Material Cycles and Waste Management

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The Japan Iron and Steel Federation (JISF), as its voluntary energy-saving action plan, proposed a 10% energy reduction by 2010 with 1990 as the basis. Further, it has suggested an additional 1.5% energy saving by the use of waste plastics as a metallurgical raw material. The amount of processing of waste plastics which corresponds to this amount of energy conversion is about 1 million t scale during 1 year. Conventional known methods for recycle-processing of waste plastics include, for example, the method of injection into a blast furnace to use waste plastics as an iron-ore reducing agent instead of coal. On the other hand, the coking process is considered to be suitable as a waste plastic recycling facility because the process involves coal carbonization in a high-temperature and reducing atmosphere. Carbonization tests with mixed waste plastics were conducted with laboratory equipment and in actual coke ovens. As a result, it was confirmed that the waste plastics recycling process using coke ovens is feasible. Therefore, a waste plastics recycling process using coke ovens was started as a chemical recycling technology at Nippon Steel.

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Recycling of Plastic Waste in Blast Furnace.

Cited by 19 publications

References 0 publications

Carbonization Behaviour of Woody Biomass and Resulting Metallurgical Coke Properties

Carbonization Behaviour of Woody Biomass and Resulting Metallurgical Coke Properties

CO2 reduction potentials by utilizing waste plastics in steel works

Waste plastics recycling process using coke ovens

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