Blast furnace smelting iron ore grade and ore composition

Iron ore is the main raw material of blast furnace smelting, the quality is good or bad, and smelting process and the technical and economic indexes have very close relationship. Decide the quality of iron ore is the main factor of chemical composition, physical properties and its metallurgical properties. Blast furnace smelting of iron ore requirements are: a high iron content, gangue, less harmful impurities, stable chemical composition, particle size uniformity, good reduction and certain mechanical strength and other properties.

(1)The iron ore grade
Grade iron ore means iron ore iron, expressed in TFe%. Quality evaluation of iron ore is the main quality indexes. Ore has no value of mining, mining can direct smelting furnace and smelting value, which depend on the content of iron ore.

Iron Shi Hantie high in favor of reducing the coke ratio and yield improvement. Based on the production experience, ore grade increased by 1%, reduced coke ratio of2%, increase yield 3%. As the ore grade is improved, which reduces the number of dosage, flux and slag is correspondingly reduced, which saves energy consumption, and is beneficial to BF running. From the mining the ore, the iron content in 30% ~ 60% between. The higher the grade, the crushing and screening can be directly put into the smelting furnace known as bonanza. Generally when the actual iron content than the theory of iron content of70% ~ 90% can be directly into the furnace. While the lower grade, can not be directly into the furnace 's ore. Lean ore beneficiation and must pass through the building blocks to smelting furnace.

(2) Composition of iron ore
The iron ore gangue composition for the vast majority of acidic, high SiO2 content. In the modern blast furnace smelting condition, in order to get a certain alkalinity of slag, must be in charge of adding a certain quantity of basic flux ( limestone ) and Si02slagging. Iron ore in the Si02content higher, more need to join the limestone, slag generated more, so, will make the coke rate rise, decline. So demand for iron ore containing Si02 of the smaller the better.

Gangue containing alkaline oxide ( Ca0, MgO ) more ore smelting when necessary, with or without limestone, on reducing coke beneficial, has high smelting value.

If you want to know Blast Furnace Of Iron Mining, or need information about Iron Ore Processing for the Blast Furnace, click the links above.
PS: We have Iron Ore Benefication Product.