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explain why copper ore has to undergo froth floatation

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After the copper ore is crushed liquid is added to make it a slurry The slurry is a mix of valuable copper ore minerals and worthless rock called gangue pronounced gang The slurry is placed in a tank and a process called froth floatation is used to separate the copper minerals from the gangue Chemical reagents called collectors are added to the slurry and bind to the copper particles making