A part of the metal scrap (steel) generated during
production activities is reused directly in-house as a raw
material in electric furnaces. As for other waste, we are
engaged in reducing ultimate disposal amount of waste
through re-resourcing (e.g. collection of scrap iron, collection
of zinc out of melting dust). Oxidized slag generated
from steelmaking is recycled at a rate as high as 90%
or more and is reused for civil construction material and
The amount of discharged industrial waste remained almost flat since FY2010 but decrease 5.5% year-on-year in FY2014. Meanwhile, the ultimate amount of disposed industrial waste marked 422 tons, an increase of 14.7% from the previous term in spite of our efforts on 3Rs (Reduce, Reuse, Recycle). This attributes to the decrease in the reuse of refractory materials at the old steelmaking plant in connection with transformation to the new steelmaking plant.
We will continue to promote recycling and reduce the ultimate disposal amount through the expansion and improvement of 3R activities.
Various cutting oils are being used in the production processes of our operations, and these also constitute one of our major environmental issues. At Ayase Factory, we apply clarification treatment to the used cutting oil and bring it back for reuse. We will eventually implement this at all other factories.
Toyohashi Factory has established a system in which
oxidized slag generated within the electric furnace during
the refining process and reduced slag discharged from
the ladle after continuous casting subsequent to the
refinery process are completely separated, treated, processed
and recycled by installation of a slag cooling facility
and crushing facility. In April 2013, the factory obtained
JIS A 5011-4: A slag aggregate for concrete category
No.4 : electric furnace slag aggregate. In addition, the
factory acquired in December 2013, another certificate
for Revised JIS A 5011-4 and started to produce and sell
electric furnace oxidized slag aggregate for concrete.
Oxidized slag aggregate is heavier in specific gravity than natural materials such as sand and gravel that have been used as concrete aggregate materials and so we expect slag to be used for heavy concrete aggregate such as wave dissipation blocks. The sales expansion of oxidized slag aggregate for concrete has a favorable effect as it reduces the extraction of natural aggregate materials and thus its impact to natural environments and also curbs energy consumption. We will exert our continued efforts to reduce environmental load through review of our business activities.