A byproduct of the steel industry which, when finely ground, is used as a fertilizer. Has a high density and will set hard if damaged by wetting. Slag so damaged may or may not have a value, dependent upon the cost of drying, regrinding. It is usually packed in bags. Contact with acids gives rise to an offensive odor, but this can be removed by the drying of the slag, without loss of phosphate value unless the acid is toxic. See also FERTILIZERS, PHOSPHATES AND SUPERPHOSPHATES.
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