antimony has long been reckoned as a strategic metal. it is today not only in metallic form, e.g. as an alloying element in lead, but also to an increasing extent in the form of sb 2 o 3 as a flame retardant filler in plastics. the mineral raw material that provides nearly all the worlds supply of antimony is stibnite, sb 2 s 3.the flotation properties of this mineral are fairly well
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