Abstract
Physicochemical and morphological characteristics of coal gasification solid wastes produced by three different processes were investigated to assess the potential environmental impacts of disposal of these wastes. The wastes were composed of either calcic or ferruginous alumino-silicate glass with small amounts (1-7%) of magnetic particles. The calcic waste had relatively clean surfaces and a homogeneous matrix composition. The magnetic fraction of the waste was composed of metallic iron particles. The ferruginous wastes were occasionally covered by iron oxide or sulfide coatings. Magnetic particles in one ferruginous waste had immiscible iron oxide and sulfide phases in a silicate matrix. The magnetic fraction of the other waste was composed of iron sulfide particles. Some chalcophile elements displayed an association with the surface coatings and magnetic fractions. The gasification solid wastes were different from each other in almost every aspect as they represent products from extremely diverse process conditions.
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