Gangue or tailing content harmful effect are not asked. Is it safe to touch ash melting slag, blast furnace slag and steelmaking slag separately at cold state, if they are not too sharp-pointed? What about toxic effects for long term skin contact with various metallurgical slag, as the case for jewelry made of slag?
It depends what metals and other substances are in the slags and clinkers. I would expect skin absorption to be low for most of the metals. You may run across some individuals with skin allergies to certain metals such as nickel and chromiums. There can be inhalable dusts and hand-to-mouth behaviors that can cause exposure. Slag may or may not carry polycyclic aromatic hydrocarbons depending on what other materials have fallen onto it.
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