高炉冶炼对铁矿石的要求（Requirements for iron ore smelting by blast furnace）.doc

高炉冶炼对铁矿石的要求（Requirements for iron ore smelting by blast furnace） The requirements for iron ore smelting in blast furnace Iron ore is the main raw material of blast furnace smelting, the quality, and the smelting process and the technical and economical indexes have very close relationship. The main factors determining the quality of iron ore is the physical properties and chemical composition, metallurgical properties. The requirements for iron ore smelting in blast furnace is high iron content, less gangue, less harmful impurities, stable chemical composition, particle size uniformity, reducibility and certain mechanical strength and good performance. First, the iron ore grade Iron ore grade refers to the amount of iron ore, represented by TFe%. Taste is the main index to evaluate the quality of iron ore. There is no ore mining exploitation value, whether directly into the smelting furnace and smelting of value, the amount of iron ore are determined by the. The amount of iron ore is helpful to decrease the coke rate and yield. According to the production experience, to improve the grade of ore 1%, coke rate decreased by 2%, the yield increased by 3%. Because with the ore grade increases, reducing the number of gangue, flux amount and amount of slag is reduced, saving energy consumption, but also conducive to the operation of bf. From the mine mined ore, iron content in 30% ~ 60%. The higher the grade, the crushing and screening after directly into the smelting furnace called ore. Generally when the actual iron content is greater than the theory of iron content of 70% ~ 90% square can directly enter the furnace. But low grade, not directly into the furnace is poor. After dressing and lean must block can be put into the smelting furnace. Two, gangue Most of the iron ore gangue is acidic, high SiO2 content. In the modern blast furnace conditions, in order to get some slag basicity, it must be equipped with a certain amount of basic flux in charge (limestone) slag and