 Generation
and recycling of byproducts |
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The
byproducts generated from a manufacturing site include slag, dust,
sludge, and waste oil. We are promoting the effective use of metal-containing
substances as raw materials for steel, and slag whose main component
is lime or silica as a natural-resource substitute for cement raw
materials, roadbed materials, and aggregate for civil engineering
projects. Blast furnace cement, which has blast furnace slag as a
raw material, is designated as a "specified procurement substance"
under the Green Purchasing Law. We have achieved a nearly 100% recycling
rate for slag, and 87% for other materials, and we continue to promote
its further effective use. |
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Notes: |
Slag: |
A rocky substance that is the
gangue component of ore that arises when a metal is melted and
refined, or what arises when byproduct limestone is melted. |
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Dust: |
What is recovered from an exhaust
gas dust collector, mainly iron oxide, etc. |
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Sludge: |
The mud-like substance, consisting
mainly of metal oxides, etc., that remains after treatment of
plant waste water. |
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| Changes
and plans for the final disposal amount |
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The
Recycling Law, etc. calls for the planned limitation of the occurrence
of byproducts and the promotion of recycling measures, and our company
is taking on the challenge of reducing the annual final disposal amount
by 75% by 2010, taking 1990 as the base year. |
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Recycled
product recognition
Taking up "the safeguarding of natural resources" as one item
of environment management policy at the Shunan Works, the entire
facility is developing activities to reduce the quantity of
byproducts that arise and to recycle them.
These efforts for the recycling of slag were recognized in February
2003, with registration as a "Yamaguchi Prefecture recognized
recycled product". |
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| Recycling
process for byproducts |
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The
slag, dust, and sludge that are the main byproducts of the Kure Works
and Shunan Works has an iron content of from 15% to as much as 65%.
Iin order to reuse them as steel raw materials, we have installed
recycling plants within these manufacturing works and have set up
a recycling system. This has resulted in achieving a recycling rate
of almost 100%. The dust recycling plant (which went into operation
in 1983) at the Kure Works and the MRS (raw material pre-treatment
process, which went into operation in 1975) at the Shunan Works process
the byproducts generated within these works so as to efficiently recover
the iron in subsequent processes, evidencing our early initiatives
toward building a recycling process. And a refractories recycling
center for recycling scrap bricks went into operation in 2006. |
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Refractories
recycling center |
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| Sales
activities based on a steel slag products sales manual |
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Sales management
of steel slag products
In selling steel slag products, sales activities are carried
out according to a salesman's manual prepared along the lines
of the "Guidelines for the control of steel slag products"
prepared by the Steel Slag Association, to ensure that customers
use steel slag products appropriately, taking full advantage
of their properties.
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| Recycling
of generated products Shunan Shigyo
Co., Ltd. |
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In
the manufacture of stainless steel sheets, paper is interleaved between
the steel sheets to prevent any scratching in the rolling and finishing
processes. Ordinarily, repeatedly used interleaving paper is discarded,
but this company recycles such used material as raw material for making
interleaving paper for metal. |
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Inserting interleaving paper in to a stainless steel coil |
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