Cast Iron is iron that has been melted, poured into a mold, and allowed to solidify. The fundamental distinction between cast iron and wrought iron is in how they are produced. The differences can be found in the names: wrought is a past participle of work (“worked iron”), and cast describes anything formed by the casting process.
Hotbriquetted iron (HBI) is a compacted form of DRI designed for ease of shipping, handling and storage. Hot direct reduced iron (HDRI) is DRI that is transported hot, directly from the reduction furnace, into an electric arc furnace, thereby saving energy. The direct reduction process uses pelletized iron ore or natural "lump" ore.