Patent ID: 7775465
Filing Date: 2010-08-17
Classification: B02C,C22B

Abstract:
1. A method of grinding iron ore or iron ore concentrate comprising the steps of: grinding iron ore or iron ore concentrate in circulation in a material bed roll mill; separating quantitatively the iron ore or iron ore concentrate from the material bed roll mill into one fraction and other fraction; sending the one fraction of the iron ore or iron ore concentrate to the material bed roll mill; classifying the other fraction of the iron ore or iron ore concentrate into oversize material and fines by performing a wet classification process on the ground iron ore or iron ore concentrate; extracting at least a portion of moisture from the oversize material before returning the oversize material to the material bed roll mill; and returning the oversize material to the material bed roll mill with the ratio of oversize material to fines not being greater than 3, thereby grinding the iron ore or iron ore concentrate to a Blaine fineness of 1600 to 2200.