Question

what is roasting and calcination with equation​

Answer 1

Bonjour!¡

Roasting: Heating of metal in presence of Oxygen. Sulphide ores are converted into oxide ores by this process.

Ex: ZnS + O2 ==∆==⟩ ZnO + SO2

Calcination: Heating of metal in limited supply of Oxygen. Carbonate ores are converted into oxide ores by this process.

Ex: ZnCO3 ==∆==⟩ ZnO + CO2

Answer 2

CALCINATION IS THE PROCESS OF HEATING CONCENTRATED ORE IN THE ABSENCE OF AIR AT A TEMPERATURE BELOW ITS MELTING POINT.CARBONATES AND HYDROXIDES OF METALS DECOMPOSE TO FORM OXIDES.

ROASTING IS THE PROCESS OF HEATING CONCENTRATED ORE IN A CURRENT OF AIR AT A TEMPERATURE BELOW ITS MELTING POINT.WHWN THE CONCENTRATED ORE IS SUBJECTED TO ROASTING ,THE MOISTURE PRESENT IN IT IS REMOVED AS VAPOUR.