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China iron ore concentrator machine jigger j. Apr 20, 2017 fe ore was made, shipped to braddock furnace and used there by james gayley. this, i think, was the first use of magnetic iron-ore concentrates in a blast furnace. the small machine was of the belt type. mr. ball soon after designed a drum-type machine, and later a double-drum machine in which a three-part separation was made.Iron ore ...

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