Kang SK  Nam KU  Seo HN  Kim NJ  Min KS  Chung HS  Oh HK

Vol. 6,  No. 1, pp. 61-69, Jun.  2000

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In this study, generation process and properties of inorganic industrial waste which can be used in cement industry were investigated. The scheme of recycling to use the selected waste as raw materials, mineralizer and flux, admixture and raw materials for special cement was decided and then various experiments were carried out. The experimental results were as follows; In the use of industrial waste as raw materials, ferrous materials could be substituted by Cu-slag, Zn-slag, electric arc furnace or convertor furnace slag etc., and a siliceous material could be substituted by sand from cast-iron industry. By-products from sugar or fertilizer industry, which has CaF2 as the main component, and jarosite from Zn refinery enabled clinker phases to be formed at lower temperature by 100~150 ℃. Adding Cu slag and STS sludge in proper proportion to cement improved properties of cement. Fly ash and limestone powder as admixture had the same effect on cement. As a raw material for special cement, aluminium waste sludge could be used in making ultra early strength cement, which had the compressive strength of 300kg/cm(2) within 2hours. And two different ashes from municipal incinerator could be raw materials of the cement which was mainly composed of C3S and C11A7ㆍCaCl2 as clinker phases.