Which of the following is not a basic flux?

The slag obtained during the extraction of copper from copper pyrites is composed mainly of

The iron obtained from the blast furnace is called

Heating with carbon in absence of air is known as:

Low grade $Cu$ ores are available and $Zn$ and $Fe$ scraps are also available. Which scrap among the two would be more suitable for reducing the leached $Cu$ ore (economically)?

What is blister copper?