KRASTORIO 2 enriched iron recipe, 1 full red belts, tileable, no modules, only red belts, underground, blue inserters and filterable inserters for by products, clean the dirty water from the enrichement process, then re-use the iron-ore, and delete the stone with a crusher. The chemicals factories overproduce, you would have to remove one if you want a perfect ratio, but i added it for aesthetic, same for filtration centers.