JFE TECHNICAL REPORT

No.13 Special Issue on “Ironmaking Technology” and “Slag Products”

Reuse Technology for Slag Generated from Municipal Solid Waste Melting Systems


AKASHI Tetsuo     SUDO Masahiro

Abstract

JFE Engineering has developed a direct melting system for municipal solid waste (MSW) and two types of MSW ash melting systems. Slag generated from the systems complied with the new safety quality requirements in the Japanese Industrial Standards (JIS). For application as road construction material, field tests were performed using air-cooled slag produced from the JFE electric-resistance ash melting furnace mixed with other construction materials and the slag-mixture reuse materials were dug up after about three years of use. The results showed that performance in construction work was almost the same as that of using normal materials without slag. Also, interlocking blocks and hollow concrete blocks were manufactured using the air-cooled slag mixtures. The prototypes had sufficient strength qualities as defined in the standards for concrete products. Moreover, water-cooled slag produced from the JFE high-temperature gasifying and direct melting furnace, which satisfies the FM2.5 standard for fine aggregate in road construction materials, was experimentally used in construction work as ground material around sewer water pipes. It was found that the slag material was fully suitable for this application.

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