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When used as the aggregate portion of a concrete mix, magnetite increases the density of the concrete to twice that of standard concrete. This so called "heavy concrete" has become a common building material in nuclear plants as well as (in brick form) for the mitigation of radiation in x-ray facilities.
Magnetite - Wikipedia, the free encyclopedia Magnetite is a mineral, one of the two common naturally occurring iron oxides (chemical formula Fe 3 O 4) and a member of the spinel group. Magnetite is the most iron ore mining process,iron ore mining equipment for sale Iron ore mining process flow chart.