Question

Mention the difference between calcination and roasting. How these
processes are used in the extraction of zinc ? Explain with the help of
chemical equations. After these processes, is reduction necessary to obtain
zinc ? Why?​

Answer 1

Explanation:

While calcination is mostly used in the oxidation of carbonates, roasting is a method that is used for converting sulphide ores. During roasting, moisture and non-metallic impurities in the form of volatile gases are released. ... An example of roasting is when Zinc sulphide is converted into zinc oxide.

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Answer 2

Answer:

roasting-

1.ore is heated in excess of air

2.This is used for sulphide ores

3. SO2 is produced along with a metal oxide

calcination-

1. ore is heated in the absence of air

2. this is used for carbonate ores

3. CO2 is produced along with metal oxide

2ZnS + 3O2 = 2ZnO +CO2( roasting)

ZnCo3 -ZnO+CO(calcination)

yes it is necessary because salts of these metals like chlorides in molten from are electrolysis metal is deposited at the cathode and chlorine is celebrated at the anode