A Study on the Characteristics of Melted Slag of Char Generated from Gasification of MSW

摘要

The gasification or pyrolysis technology has been focused as a prospective alternative with taking over conventional incineration of municipal solid wastes (MSW) in some countries. In several among various processes the char produced from gasification or pyrolysis stage is fed into hot temperature conditions for obtaining final product of slag that could be recycled such as construction materials or others. In this investigation the char generated from gasification process was characterized to see the appreciation to a melting process by extraction test, elemental analysis by XRF and micro-structure analysis by SEM. During the ignition of char, mass loss was observed to find out any volatilization of inorganic compound at the range of temperature up to 1000℃. The proper temperature for melting char has been found as 1200 ～ 1250℃. Effects of basicity of slag and cooling methods on slag product were experimented and compared to characterize the properties of slag. Two different test methods of extraction for heavy metals in a slag were made and it's physical properties such as compressive strength, hardness, density, absorption rate and stability were measured to observe recyclability. The results concluded that the melted slag from char generated from gasification of MSW could be utilized without any hazard or toxicity. Further studies on recyclability of slag from pilot-scale plant will be made to confirm it's utilization.