One step resource utilization treatment of solid waste: Preparation of high-performance building bricks from calcium carbide slag by ultra-high mechanical pressure

Abstract

Calcium carbide slag (CCS), a bulk solid waste byproduct of the energy industry. This paper introduced an innovative ultra-high pressure contact forming technology that utilizes 100% CCS under high pressure conditions ranging from 100 to 400 MPa. investigated the effects of pressing pressure and curing conditions on the comprehensive performance of the resulting bricks. The findings reveal that bricks subjected to autoclave curing for a duration of 3 days exhibit optimal mechanical and waterproof properties. The bricks demonstrated the compressive and flexural strength of 37 MPa and 4.3 MPa, and a softening coefficient of 0.89. Furthermore, the bricks' dry density, wet density, and porosity index were measured at 1200 kg/m3, 1600 kg/m3, and 1.3, respectively. Notably, the leaching concentrations of toxic and harmful elements within the bricks are in compliance with environmental standards. This research delineates a viable avenue for the future resourceful utilization of solid waste.