What is Matte

Matte as described earlier isusually a molten mixture of iron and copper sulphides. Minor amounts of other sulphides may be present, Copper grade of matte is important. Whenever matte grade is given in the problem, it means copper grade and is defined as



Assuming that matte consists of  and  in copper smelting. Density of matte is 5 to and melting point depends on proportion of  and may range in between .

What is a Slag

Slag is a molten mixture of mainly oxides and unreduced sulphides. Limestone or lime is added as a flux. Slag usually consists of and . Density of slag is
.