Abstract
Massive accumulation of industrial carbide slag tend to cause ecological environment pollution and greenhouse gas emission. This innovative work proposed to fabricate shape-stable phase change materials (SSPCMs) with carbide slag to utilise industrial solid waste and protect precious natural resources. Seven SSPCMs were fabricated with different mass ratios of industrial carbide slag to sodium nitrate by cold-compression hot-sintering method, and key performance was investigated on the SSPCMs. Results showed that the SSPCM (sample CC6) with the mass ratio of 5:5 of carbide slag to sodium nitrate presented the best performance: sample CC6 achieved a high thermal energy storage density of 447 J/g in the range of 100–400 °C and reached a mechanical strength of 73.6 MPa; sample CC6 demonstrated a good thermal stability and chemical compatibility between carbide slag and sodium nitrate during the heating/cooling cycles; the thermal conductivity of sample CC6 was 0.93 W/(m•K), and elements distributed uniformly in sample CC6.
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