Metallurgy — Flashcards
Maharashtra Board · Class 10 · Science
39 flashcards for Metallurgy (Maharashtra Board Class 10 Science) to test yourself on key terms and facts. Sample: "What is metallurgy?"
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What is metallurgy?
Answer
Metallurgy is the science and technology of extracting metals from ores and purifying them for use.
What are minerals and ores?
Answer
Minerals are the compounds of metals that occur in nature along with impurities. Ores are the minerals from which the metal can be separated economically.
What is gangue?
Answer
Gangue is the unwanted impurity present in an ore, such as soil, sand, silica, or rocky matter.
Why are gold, silver, and platinum often found in free state?
Answer
They are less reactive metals, so they are not easily affected by air, water, or other natural factors. That is why they often occur in free state in nature.
What is concentration of ores?
Answer
Concentration of ores is the process of separating gangue from the ore so that the amount of the desired metal compound increases.
How does the Wilfley table method work?
Answer
The powdered ore is placed on a vibrating inclined table with riffles. Water flows over it. Lighter gangue is washed away, while heavier ore particles remain behind and collect on the table.
Why is magnetic separation used for cassiterite?
Answer
Cassiterite contains a nonmagnetic part, stannic oxide (SnO2), and a magnetic part, ferrous tungstate (FeWO4). Magnetic separation separates these two parts by using their different magnetic propertie…
Which ores are concentrated by froth floatation?
Answer
Froth floatation is used to concentrate sulphide ores such as zinc blende (ZnS) and copper pyrite (CuFeS2).
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