Question

what is gangue.
what is Calculation and
what is roasting

Answer 1

gangue is the impurities of sand and rocks materials present in an ore it must be removed fro the extraction of the metals
calcilation is the process in which an ore is heated strongly below its melting point in the absence of air to convert the carbonate Ore into metal oxide. zinc carbonate when heated in absence of air gets converted into zinc oxide is an example of calcilation
roasting is the process in which a concentrated Ore is heated strongly below its melting points in the presence of excess of air to convert the concentrated sulphide Ore to metal oxides. zinc sulphide when heated strongly in presence of excess of air gives zinc oxide and sulphur dioxide is an example of roasting

Answer 2

Earthly impurities including silica (SiO2), mud, etc., associated with the ore are called gangue or matrix.

Roasting is a process of heating the concentrated ore to a high temperature in the presence of air or oxygen.

The process of heating the concentrated ore in the absence of air or oxygen is called as calcination.

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