Amid the destruction of the global environment by water and atmospheric pollution, deforestation, and desertification, developed countries are moving toward a recycling-oriented society as an effective measure to prevent environmental destruction. Daido Steel has set a target for reducing volumes of landfilling coproducts for disposal to less than 25% the 1990 level, based on the voluntary action plan established by The Japan Iron and Steel Federation, and is working to introduce and develop various recycling technologies to achieve the target.
Reuse and recycling of by-products
By-products generated by the electric arc furnace steel-making process used at Daido Steel amounted to 267,000 tons/year of home scrap (all of which was recycled), and 357,000 tons/year of steel slag and other by-products (effectively used volume 330,000 tons/year, unused 27,000 tons/year) in fiscal 2009. While the inability to convert by-products containing fluorine into a raw material because of stricter environmental regulations has become an issue, based on technological developments Daido Steel plans to reduce the amount of unused by-product through fluorine-free operations that do not use fluorite (principal ingredient: calcium fluoride) in the refining of specialty steel products, and by expanding its reuse operations for converting used slag into briquettes and re-using the briquettes as an input material.
Recycling of steel manufacturing slag
The slag resulting from steelmaking that had been used as a base course road bed material for road construction was selected as a procurement good by enactment of the Green Purchasing Law in 2000. By helping conserve natural resources and reduce greenhouse gases (GHG), slag is a valuable recyclable resource that contributes to the protection and preservation of the global environment. Daido Steel manufactures and sells slag products based on the proper quality controls. When selling slag, Daido Steel strictly verifies customers and their use of slag by following its Manual Concerning the Sale and Control of Iron and Steel Slag Products, a booklet the Company prepared based on the Guidelines on Control of Iron and Steel Slag Product published by the Nippon Slag Association. In 2009, the Guidelines were revised with the goal of further enhancing controls in order to ensure safe use of slag products, and together with revising and updating its manual to conform to the revised Guidelines, Daido Steel also received third-party certification of its compliance. Daido Steel will continue its efforts in the future as well, to strengthen controls on the manufacture and sale of slag products and ensure the safe use of these products by all users.