Chemistry - Metallurgy Question with Solution | TestHub

Statement A is incorrect. Calcination and roasting are typically done in reverberatory furnaces or rotary kilns, not blast furnaces. Blast furnaces are primarily used for reduction of iron ore.

Statement B is correct. The unwanted rocky or sandy impurities associated with an ore are called gangue or matrix.

Statement C is correct. The froth flotation process is a widely used method for concentrating sulfide ores due to their preferential wettability by oil.

Statement D is incorrect. A substance that reacts with gangue to form a fusible mass (slag) is called a flux, not slag itself. Slag is the fusible product.

Therefore, the correct statements are B and C.