What happens to the molten tin and slag after a smelting batch is finished?

At the completion of a smelting batch, the molten materials are separated and processed as follows:

• Impure Tin: The molten tin is tapped off from the furnace and cast into large slabs. These slabs are subsequently sent for further refining to reach the desired purity levels.1
• Slag: The slag, which floats on top of the molten tin during the process, is poured into water tanks. This action solidifies the slag into granules. Because this granulated material may still contain residual amounts of tin, it is collected for retreatment.1