NOVELTY - A base material containing an organic substance is thermally decomposed. The thermal decomposed product is gas-solid separated into char mixture and a gas component. Water is added to the char mixture, stirred and a slurry is obtained. The obtained slurry is solid-liquid separated. The solid-liquid separated substance is dried in a drier (5) and stored in a storage tank (6).    USE - For thermally decomposing waste material containing organic substances and chloride, and char obtained is used as fuel for melting.    ADVANTAGE - The thermal decomposition melting equipment is operated stably and effectively removes chloride present in the waste material. The inorganic substance in the waste material is melted effectively, and dioxins in the waste material is decomposed effectively.    DETAILED DESCRIPTION - A base material containing a organic substance is thermally decomposed. The thermal decomposed product is gas-solid separated into char mixture which contains a carbon as a main component, and a gas component which contains a non-flammable. Water is added to the char mixture, stirred in a slurrying tank (3) with a stirrer and a slurry is obtained. The obtained slurry is solid-liquid separated in a filtration machine (4) which performs multi-stage cleaning process using water. The solid-liquid separated substance is dried in a drier and stored in a storage tank.    An INDEPENDENT CLAIM is included for thermal decomposition melting equipment of waste material containing an organic substance and chloride which has an unit for thermally decomposing the waste material, gas-solid separating unit for separating thermally decomposed product into char mixture and gas component, slurrying tank with a stirrer, filtration machine for solid-liquid separation of slurry, drier and storage tank. The unit for thermally decomposing the waste material contains an alkali component and alkaline-earth component in its bottom portion.    DESCRIPTION OF DRAWING(S) - The figure shows the flowsheet of a thermal decomposition melting equipment. (Drawing includes non-English language text).    Slurrying tank (3)    Filtration machine (4)    Drier (5)    Storage tank (6)