1.

Which of the following process is related with the removal of sulphur by heating in the air ?A. SmeltingB. CalcinationC. AnnealingD. Roasting

Answer» Correct Answer - 4
Roasting is the process of heating the ore strongly in the presence of excess of air. The process is usually carried for sulphide ore and the following changes take place.
`(i)` Moisture is removed.
`(ii)` The voltatile impurities are removed.
`(iii)` Impurities of sulphur, arsenic, phosphorus etc. are removed in form of volatile oxide.
`S+O_(2)rarrSO_(2)uarr," "4As+3O_(2)rarr2As_(2)O_(3)uarr," "P_(4)+5O_(2)rarr2P_(2)O_(5)uarr`
`(iv)` Sulphide ores get oxidised in to metal oxides
`2FeS+3O_(2)rarrFeO+2SO_(2)`


Discussion

No Comment Found

Related InterviewSolutions