For the extraction of chromium, fusion of chromite ore with sodium or potassium carbonate in excess of air is done. What exactly happens in this 'fusion' process?
According to my textbook (class XII chemistry, NCERT): d- and f-block element, extraction of chromite ore
According to the dictionary: To melt or fuse (ores) in order to separate the metallic constituents.
Now, while this makes sense and is sort of (implied) by my textbook? how exactly is this process done? I want to learn the technicalities related to it! Further I've heard we use alkali metals in fusion, why do we use them ?