The processes used for removing the gangue from the ore are based on the differences between the _______ or _______ properties of the gangue and the ore.
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A.
solubility; thermal
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B.
magnetic; thermal
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C.
chemical; electrical
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D.
physical; chemical
Correct Answer:
D. physical; chemical
Explanation:
The extraction of gangue from ore relies on the distinct physical and chemical characteristics of the two components. Gangue represents the unwanted stony or sandy impurities, while the ore contains the valuable mineral. Techniques such as hydraulic washing, magnetic separation, and froth flotation are chosen based on specific differences in properties like density, magnetism, or wettability. Consequently, identifying these physical and chemical variations is essential for selecting the most effective purification process.
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