一、导言中国前震旦纪变质地层中所含的条带状变质铁矿,是中国储量最大的铁矿类型,由于在辽宁省鞍山附近最先发现并且分布很广,因此称为鞍山式铁矿。铁矿主要为贫矿,含铁量一般在25—40％之间,以35％左右者最多,但局部也含有铁分在 I. INTRODUCTION The banded metamorphic iron ore contained in the pre-Sinian metamorphic strata is China’s largest iron ore deposit. Since it was first discovered and widely distributed in Anshan, Liaoning Province, it is called Anshan-type iron ore mine . Iron ore is mainly poor ore, iron content is generally between 25-40%, up to about 35%, but also contains iron in the local points