Posts Tagged ‘Carbon footprint’

Severstal to cut emissions making energy from waste methane

In addition to direct emissions from steelmaking, emissions from the extraction of raw materials also contribute to steel’s total carbon footprint. However, this also gives vertically integrated steelmakers the opportunity to invest in energy efficiency across the supply chain. One option is to produce power from mining waste gases, insuating the mining operation from volatile energy prices and reducing overall greenhouse gas emissions.

SBB 28 Sept Vorkutaugol, the coking coal mining division of Russian steelmaker Severstal, will start recycling methane gas collected from its Severnaya mine, processing it into heat and electricity at the 800m rouble ($25m) worth gas generating power plant it is preparing to commissioning in the first quarter of 2012, Steel Business Briefing learns from Vorkutaugol.

The 18 megawatt plant will cover 100% and 70% of electricity and heat energy needs at Severnaya. When fully operational, it will enable Vorkutaugol to reduce its emissions by 0.5m t/y in carbon dioxide equivalent, as well as to save up to 300m roubles/year, which may be diverted onto operational needs and other investments, SBB understands.

Based in Russia’s northwestern Komi republic, Vorkutaugol operates four mines: Severnaya, Vorkutinskaya, Zapolyarnaya and Komsomolskaya, and open pit Yunyaginsky. Their combined output is expected to amount to 8.5mt this year, as SBB previously reported.

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Aperam’s Timóteo completes coke-to-charcoal switch

Measures to reduce the carbon footprint of steelmaking can also help to reduce steelmaking costs, if the situation is right.The use of charcoal has its limitations, it can only be used in small blast furnaces for example. However, for Aperam in Brazil, which uses small-scale blast furnaces and has a charcoal producing subsidiary operating nearby its plant, changing its raw materials can reduce costs, provide a stream of carbon credits and improve its environmental credentials.

SBB 27 July Stainless, electrical steels and special alloys maker Aperam’s Brazilian unit Timóteo has finalized the conversion of its No 2 blast furnace fuel from coke to charcoal, Steel Business Briefing learns from the company.

The mill said last year it would invest R$175m (US$114m) to replace imported coke and metallurgical coal with domestically sourced charcoal in a move that will result in “a total replacement of this power matrix.”

SBB estimates the cost of charcoal is around one-third that of coke, with the use of the former allowing Aperam to earn carbon credits.