How did Carl Wilhelm Scheele produce molybdic oxide from molybdenite?

In 1778, the Swedish chemist Carl Wilhelm Scheele formally identified molybdenum by producing molybdic oxide from the mineral molybdenite.

To achieve this, Scheele pulverized the molybdenite (MoS${}_2$) and treated it with concentrated nitric acid. He then evaporated the resulting residue to dryness to obtain the oxide. This discovery was a significant step in molybdenum processing, as it provided the material that Peter Jacob Hjelm later used to isolate the first sample of metallic molybdenum in 1781.12