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In the second process, the ore is converted to magnesium oxide, which is then treated with the alloy ferrosilicon .
Late additions of ferrosilicon have been reported to increase toughness.
The majority of such iron is made by treatment with ferrosilicon containing 5 or 10% magnesium.
One of the most common silicon-iron alloys, for example, is ferrosilicon .
The fishing industry is of vital importance to the economy, accounting for three-quarters of exports; other exports are aluminium (produced from imported alumina) and ferrosilicon .
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