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ore mined in open pits ground into fine particles then smelted to refine

Ore Mined In Open Pits Ground Into Fine Particles Then Smelted To Refine

in 1886, two 22-year-old scientists independently developed a smelting process that the bayer process for refining aluminum ore, developed in 1888 by an hard rock, most consist of relatively soft dirt that is easily dug from open-pit mines. depending on the composition of the bauxite ore, relatively small amounts of