🧪 Spodumene Sulfation Roast (2D)

This 2D companion drives the same sulfation-roast chemistry as the 3D version through a plain rotary-kiln cross-section: particles are drawn along the drum's axial length, and each one's local conversion is computed from an Arrhenius rate constant (temperature and particle-size dependent) combined with its residence time at that position, so the grey-to-amber-to-green gradient you see is the real feed-to-discharge conversion profile, not a decoration.