In this study, non-sintered ceramsite was prepared using coal gasification coarse slag obtained from
a methanol plant. The basic performance and heavy metal leaching toxicity were analyzed. The results showed
that seven out of nine non-sintered ceramsite groups were in accordance with the national standard of compressive
strength (5 MPa), while only three groups met the national standard of water absorption index of less than 22%.
The heavy metal concentrations in these three groups were found to be lower than that specified in National Class
IV of surface water environment standards. The concentration of Cr was found to be 16.45 μg/L, which represents
only 1% of the IV standard. The optimum mixing ratio, which showed high compressive strength (6.76 MPa) and
low water absorption (20.12%), was found to be 73% coal gasification coarse slag, 15% cement, and 12% quartz
sand. The characterization using Fourier transform infrared spectroscopy showed that the formation of gelatin
in ceramsite enhances the performance of the ceramsite base and increases the immobilization of heavy metal.
The study proved that the preparation of non-sintered ceramsite using coal gasification coarse slag reduces its
environmental risk and achieves efficient utilization of the slag. Therefore, it can be concluded that it is a feasible
and environmental friendly method for the disposal of coal slag