The priority of recipe execution depends on their order, which can be changed by dragging them using the drag handles (1). To prioritize {0} processing over {1}, drag the handle of the <b>{0} recipe</b> and move it above the <b>{1} recipe</b>.

When {0} is smelted, the {2} will produce <b>{1}</b>. {1} can be dumped anywhere on the island by placing dumping designations (unless you disabled dumping in the <b>global dumping filter</b>). Trucks will always prioritize delivering {1} and other materials to where they are needed (e.g. for concrete production) before dumping. Dumping {1} is important, as your smelting industry will usually produce way more than you can use. Dumping it has no pollution effect.