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Which of the following statements about metallurgy are correct?
- Calcination and roasting are generally carried out in a blast furnace
- The sandy or rocky materials mixed with an ore are called gangue (matrix)
- The froth flotation process is suitable for concentrating sulphide ores
- A substance that reacts with gangue to form a fusible mass is called slag
Correct answer: The froth flotation process is suitable for concentrating sulphide ores
Solution
Calcination and roasting are done in reverberatory or muffle furnaces, not blast furnaces (which are used for smelting). The rocky impurities with ore are gangue. Froth flotation is indeed suitable for sulphide ores because pine oil preferentially wets sulphide mineral particles. The substance added to react with gangue is flux; the resulting product is slag — so option D has the definition of flux, not slag.
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