Over the years what element has been used as a reducing agent to reduce iron metal from its ores?

Question

Quizplus · Accepted Answer

Carbon has been used as a reducing agent to extract iron from its ores in the form of coke (a type of carbon derived from coal). This carbon reduces the iron oxide into iron metal, along with the production of carbon dioxide gas. This method is known as the blast furnace process and has been the main method of iron production for centuries.

Over the Years What Element Has Been Used as a Reducing