Spent shale or spent oil shale (also known as retorted shale) is a solid residue from the shale-oil extraction process of producing synthetic shale oil from oil shale. It consists of inorganic compounds (minerals) and remaining organic matter known as char—a carbonaceous residue formed from kerogen.
Spent shale or spent oil shale (also known as retorted shale) is a solid residue from the shale-oil extraction process of producing synthetic shale oil from oil shale. It consists of inorganic compounds (minerals) and remaining organic matter known as char—a carbonaceous residue formed from kerogen.
Source: Wikipedia "Spent shale" · CC BY-SA 4.0
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