Answer
Verified
459k+ views
Hint: Both roasting and calcination are processes used in metallurgy. They are generally used to remove impurities from the metal ore. They are both thermal treatments provided to a meal ore.
Complete step by step answer:
Even though both roasting and calcination are used for a similar purpose these two processes are very different from each other which we will discuss below-
These are the few differences between the two processes.
Additional Information: Calcination is carried out in a reactor or a furnace which are after referred as kilns. Calcination of limestone is a very common reaction which is used in formation of cement industrially. However, calcination is also used for removal of aluminium ions from zeolites during their synthesis.
Roasting is an exothermic process and is carried out in a reverberatory furnace. In early age, roasting was carried out by burning wood on top of ore so that its temperature would rise to a point where sulphur became its fuel i.e. no external fuel sources were required. However, this produced a large amount of toxic acidic and metallic compounds.
Note: It is important to remember that calcination is an oxygen deficient process and roasting is an oxygen excess process. It is also important to remember that calcination should not be confused with calcification which is a completely different process in biology.
Complete step by step answer:
Even though both roasting and calcination are used for a similar purpose these two processes are very different from each other which we will discuss below-
ROASTING | CALCINATION |
Ore is heated in regular or excess supply of air. | Ore is heated in absence of air. |
Ore is heated at below the melting point | Generally used for carbonates and oxide ores. |
Generally used for sulphide ores. | No such specifications are observed |
Impurities are removed in form oxide gases like-$S{{O}_{2}},{{P}_{2}}{{O}_{5}}$ | Moisture and other impurities are removed. |
Most common example is for chalcocite ore-$2C{{u}_{2}}S+3{{O}_{2}}\to 2C{{u}_{2}}O+2S{{O}_{2}}$ | Most common example is calcination of limestone-\[CaC{{O}_{3}}\xrightarrow{\Delta }CaO+C{{O}_{2}}(g)\] |
These are the few differences between the two processes.
Additional Information: Calcination is carried out in a reactor or a furnace which are after referred as kilns. Calcination of limestone is a very common reaction which is used in formation of cement industrially. However, calcination is also used for removal of aluminium ions from zeolites during their synthesis.
Roasting is an exothermic process and is carried out in a reverberatory furnace. In early age, roasting was carried out by burning wood on top of ore so that its temperature would rise to a point where sulphur became its fuel i.e. no external fuel sources were required. However, this produced a large amount of toxic acidic and metallic compounds.
Note: It is important to remember that calcination is an oxygen deficient process and roasting is an oxygen excess process. It is also important to remember that calcination should not be confused with calcification which is a completely different process in biology.
Recently Updated Pages
Identify the feminine gender noun from the given sentence class 10 english CBSE
Your club organized a blood donation camp in your city class 10 english CBSE
Choose the correct meaning of the idiomphrase from class 10 english CBSE
Identify the neuter gender noun from the given sentence class 10 english CBSE
Choose the word which best expresses the meaning of class 10 english CBSE
Choose the word which is closest to the opposite in class 10 english CBSE
Trending doubts
Which are the Top 10 Largest Countries of the World?
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
How do you graph the function fx 4x class 9 maths CBSE
A rainbow has circular shape because A The earth is class 11 physics CBSE
The male gender of Mare is Horse class 11 biology CBSE
One Metric ton is equal to kg A 10000 B 1000 C 100 class 11 physics CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths