Question

Explain with example - calcination and roasting

Answer 1

Roasting,: in this process sulphide ore are heating in presence of air blow the melting point of the ore is called roasting

zns +o2__________zno +so2.

calcination:. the carbonate ore and oxide ore are convert into oxide ore by heating it blow the melting point in absence of air.

example

caco3________cuo+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.WHEN THE CONCENTRATED ORE IS SUBJECTED TO ROASTING ,THE MOISTURE PRESENT IN IT IS REMOVED AS VAPOUR.