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(a) Which of the following ores can be concentrated by froth floatation method and why? `Fe_2O_3,ZnS,andAl_2O_3` (b) What is the role of silica in the

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(a) Which of the following ores can be concentrated by froth floatation method and why?
`Fe_2O_3,ZnS,andAl_2O_3`
(b) What is the role of silica in the metallurgy of Copper?
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(a) Sulphide ores are concentrated by frothflotationmethod.therefore, ZnSwill be concentrated by this method.
(b) Silica is added in the reverberatory furnance during the extraction of copper to remove iron oxide present in the ore. Iron oxide reacts with silica and is removed as slag of iron silicate.
`FeO+SiO_2toFeSiO_3`
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