Production from raw materials The iron is then formed into pellets(小 球)and baked hard. This process results in an iron ore that is purer than earlier natural occuring ores. To meet today's demand for high quality steel,producers must mine low grade ore,and magnetically separate the iron bearing particles from the Technology goes one step further-baking additional material. limestone,a purifying agent called a flux (熔剂)，into the ore pelletsProduction from raw materials To meet today's demand for high quality steel, producers must mine low grade ore, and magnetically separate the iron bearing particles from the additional material. The iron is then formed into pellets（小 球） and baked hard. This process results in an iron ore that is purer than earlier natural occuring ores. Technology goes one step further - baking limestone, a purifying agent called a flux （熔剂）, into the ore pellets