Schreyerite blast furnace smelting method with high coal ratio

Abstract

The invention discloses a schreyerite blast furnace smelting method with a high coal ratio. According to the method, firstly, schreyerite is prepared into sintered ore and pellet ore; then the sintered ore, the pellet ore, raw ore and coke are put in a blast furnace from the top of the blast furnace according to the weight ratio being 5.7: 3.5: 0.8: 3; hot air and coal powder are blown from air openings in the lower portion of the blast furnace, the hot air temperature is 1180 DEG C, and a fan adopted by the blast furnace is a static blade adjustable axial-flow type electric blower; and meanwhile, the ratio between the inlet air area of each single air opening of the blast furnace and the blast furnace volume is controlled to be (2.8-3): 8000, and the air speed of the air openings is controlled to be 155-160 m / s. By means of the schreyerite blast furnace smelting method with the high coal ratio, the high coal ratio, high iron yield and high pig iron qualification rate can be guaranteed, and the technical-economic indexes of schreyerite blast furnace smelting are improved.

Description

technical field [0001] The invention relates to a method for smelting vanadium-titanium ore in a high-coal ratio blast furnace, belonging to the technical field of iron and steel metallurgy. Background technique [0002] Blast furnace ironmaking production is the most important link in the metallurgical (steel) industry. Blast furnace smelting is a continuous process of reducing iron ore to pig iron. Solid raw materials such as iron ore, coke and flux are fed into the blast furnace in batches by the furnace top charging device according to the specified ratio, and the furnace throat material level is kept at a certain height. The coke and ore form an alternate layered structure in the furnace, and the ore The material is gradually reduced and melted into iron and slag during the descending process, which gathers in the hearth and is released from the iron and slag ports regularly. [0003] Vanadium-titanium ore is mainly composed of iron, vanadium and titanium elements, an...

AI Technical Summary

Problems solved by technology

However, under certain conditions, it is not that the higher the coal ratio, the better. An excessively high coal ratio will not reduce the coke ratio in the furnace, but will also increase fuel consumption and deteriorate the furnace condition.

The blast furnace smelting vanadium-titanium ore can increase the coal ratio by increasing the air temperature and increasing the air volume. However, in the actual production and application process, it is found that after increasing the coal ratio by increasing the air volume, the iron production and pig iron pass rate are lower. There is a very obvious decline, the overall technical and economic indicators do not rise but fall, the loss outweighs the gain