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(a) What is a slag ? (b) Give the prin...

(a) What is a slag ?
(b) Give the principle of zone refining ?
( c) An ore sample of galena `(PbS)` is contaminated with zinc blende `(ZnS)`. Give an example of a chemical which can be used to concentrate galena selectively by froth flotation process.
(d) What is meant by the term 'Pyrometallurgy' ?

Text Solution

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(a) Slag is a easily fusible meterial formed when gangue stil present in the roasted or calcinated ore combines with the flux.
(b) When the melt of an impure metal is allowed to cool, the pure metal crystallises out while the impurities remain in the solution.
( c) Sodium cyanide, `NaCN`, can be used to concentrate galena selectively by froth flotation process.
(d) The process of extracting the metal by heating the metal oxide with a suitable reducing agent is known as pyrometallurgy.
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