一、前言钢铁产品是以铁(Fe)为主要元素的金属材料,是国民经济最重要的基础原材料,而铁矿石是钢铁生产的最主要原料。据世界钢铁协会(WSA)统计,目前,全球钢铁生产原料的70%以上来自铁矿石,我国的比重在90%以上。进入21世纪以来,随着工业化、城镇化进程加快,我国钢材需求大幅增长,钢铁产量迅速增加。1996年,我国粗钢产量首次突破1亿吨,居世界粗钢产量第一位,并 I. INTRODUCTION Steel products are metal materials with iron (Fe) as the main element and are the most important basic raw materials for the national economy. Iron ore is the most important raw material for steel production. According to the statistics of the World Steel Association (WSA), at present, more than 70% of the world’s raw materials for steel production come from iron ore, with the proportion in China above 90%. Since the 21st century, with the acceleration of industrialization and urbanization, the demand for steel in our country has risen sharply and the output of steel has rapidly increased. In 1996, China’s crude steel output exceeded 100 million tons for the first time, ranking the first in the world for crude steel output