The steel-making slag in the EAF industry is generated 3.2 million t/year in the Japanese whole as a waste. The most of the steel-making slag are aging, and are used as a roadbed material. But, recently those futures are very severe situation by the rivalry with the use of construction waste materials. Therefore that promoted the theme of 'the development of the fishing block using refining slag', because it was a pressing need to aim for high value added-ization in the above now. It found out

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... he following as that result. ( 1 ) The block which made the ATK cement mixed plaster with refining slag powder have a good properties as a base material. ( 2 ) The leaching of the iron ion was effective in the growth of the marine organisms, and it could get a good result by this iron ion being leached, when oxidizing slag was applied to the fishing block. ( 3 ) CO2 emission in Portland cement manufacture doesn't only become a "zero", but also this block fixes CO2 through the marine organism's growth, and it can be said as the effective block from viewpoint of a decrease in CO2.