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Scrap preheating for iron and steel

  • Knowledge partner
    Knowledge partner
    Country of registration
    Iran
    Relation to CTCN
    Network Member
    Knowledge Partner
    TA proponent
    Sector(s) of expertise
    Energy efficiency
    Industry
    Waste management

    Foolad Technic is an international engineering company, rendering services in industrial and development projects in the form of feasibility studies, management, engineering, procurement & construction on turn-key basis or in level of local and foreign markets through efficient conducting inv

  • Publication date
    Objective
    Sectors

    The goal of this report is to provide an understanding of global non-ferrous metal scrap flows in the context of non-ferrous industry developments over the 2000 to 2011 period. The focus of this study is on copper and aluminium as the two largest non-ferrous metals in terms of both material tonnages and market value. The report consists of four chapters. The first chapter, presented here, provides a brief backdrop to the analysis on non-ferrous scrap flows. It outlines growth in metal demand and the underlying reasons for this growth.

  • Objective

    Molten steel is produced by the converter process. This device recovers and uses the high temperature waste gas generated in large quantity during blowing in the converter (basic oxygen furnace: equipment used to produce crude steel from pig iron, steel scrap, etc.). Accompanying this process, about 100Nm3 of high temperature gas (CO) with a heating value of approximately 2,000 kcal/Nm3 is generated.

  • Objective

    Because the preheating shaft and melting chamber are directly and rigidly connected, the scraps are continually present from the steel to preheating areas. This enables high-temperature preheating of the scraps, resulting in a significant reduction of power consumption.
    The melting chamber is sealed off from outside air, to prevent the excess air inlet. It prevents over oxidation of scrap under high temperature preheating. As this equipment keeps always flat bath operation, electrode consumption is significantly improved.

  • Publication date
    Objective

    Brazil has more than 50 million old household refrigerators. Most of these are energy-inefficient and still contain chlorofluorocarbons (CFCs) which are ozone layer depleting gases having also an extremely high global warming potential (GWP). Currently, scrap collectors (so called catadores) collect old refrigerators from slum areas (favelas) and dismantle them in order to recover and sell any valuable materials such as metals and plastics. In this process, the CFCs from the refrigeration circuits and insulation foams are released into the atmosphere.

  • Sectors
    Objective

    Steel is by far the world’s most important metal, with a global production of 1120 Million Metric ton (MMt) in 2009 (Worldsteel, 2010). In september 2010 the most important steel producers were China (42, 90 %), EU-27 (12, 79 %), Japan (8, 26 %), USA (5, 95 %) and India (5, 05 %) (Worldsteel, 2010). Figure 1 shows the development of world steel production since 1999. Clearly, China has become the dominant steel producer.

  • Publication date
    Objective

    Capturing ozone-depleting substances and greenhouse gases from household refrigerators Brazil has more than 50 million old household refrigerators. Most of these are energy-inefficient and still contain chlorofluorocarbons (CFCs) which are ozone layer depleting gases having also an extremely high global warming potential (GWP). Currently, scrap collectors (so called catadores) collect old refrigerators from slum areas (favelas) and dismantle them in order to recover and sell any valuable materials such as metals and plastics.