Extraction of zinc from zinc blende is achieved by
- electrolytic reduction
- roasting followed by reduction with carbon
- roasting followed by reduction with anothermetal
- roasting followed by self reduction
The Correct Option is B
Approach Solution - 1
The correct answer is Option is B) roasting followed by reduction with carbon
Zinc blende contains ZnS which is first roasted partially and then subjected to reduction with carbon
\(ZnS+O_2 \rightarrow ZnO+SO_2 Roasting\)
\(ZnO+C \xrightarrow{\Delta} Zn+CO \uparrow Carbon reduction\)
Read more from the chapter: General Principles and Processes of Isolation of Elements
Approach Solution -2
The correct answer is Option is B) roasting followed by reduction with carbon
Real Life Applications
The real-life applications of extracting zinc from zinc blende are as follows:
- Zinc is widely used in die casting.
- The process of galvanization also uses zinc. The steel is coated with zinc which prevents them from rusting.
- Zinc is also used in batteries and abrasives.
Question can also be asked as
- How is zinc extracted from zinc blende?
- What are the different methods of extracting zinc from zinc blende?
- Write the steps involved during the extraction of zinc from zinc blende.
Approach Solution -3
The correct answer is Option is B) roasting followed by reduction with carbon
Raw metals are obtained with the help of extraction from their concentrated ore. Ore is the mixture in which the metal is present in its original state. The metals have to be refined with the help of reducing agents. The three important steps in this process are:
- Concentration of ore
- Isolation of metal from the ore
- Purifying the metal
Conversion of the concentrated ores
The concentrated ores need to be converted into their oxides for further processing. The concentrated ore is in its carbonated form. The process that can convert the ores into their oxides is as follows:
- Calcination
- Roasting
Reduction of oxides to metal
The metal oxides are reduced to their free metals using reducing agents. The process of reductio occurs at a low temperature. The processes of reduction are:
- Smelting
- Reduction by water gas
- Reduction by hydrogen
- Alumino Thermite Process
- Auto reduction
For extraction of Zn from ZnS
- The ore is crushed and then concentration is done using the froth-floatation method.
- Then the roasting of the ore is done in the presence of air. It is done at 1200K.
- Then ZnO is reduced to Zn metal with the help of powdered coke and after heating in a fire clay retorts.
- Electrolytic refining is used for the purification of Zn metal
Read more:
| Related concepts | ||
|---|---|---|
| Carbonate | Hydrate oxides | Bauxite ore |
| Roasting | Reduction | Iron |
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Concepts Used:
General Principles and Processes of Isolation of Elements
What are Ores and Minerals?
Minerals are the naturally occurring, homogeneous inorganic solid substances. They are having a definite chemical composition and crystalline structure, hardness and color. For example, copper pyrite, calamine, etc.
Impurities in an ore are called gauge. The removal of a gauge from the ore is called concentration ore.
Several steps are involved in the extraction of pure metal from ores. Major steps are as follows –
- Concentration of the ore
- Isolation of the metal from its concentrated ore
- Purification of the metal