Segregation and ore matching sintering method of iron ore

Abstract

The invention discloses a segregation and ore matching sintering method of iron ore. The segregation and ore matching sintering method of the iron ore comprises the following steps: S1, selecting 2 to4 kinds of an iron ore powder with different SiO2 mass percentage ratios, wherein the difference value of the SiO2 mass percentage ratio between two of the 2 to 4 kinds of iron ore powder is 3.0 to 10.0 percent; S2, controlling the SiO2 mass percentage ratio of the mixed ore to be 5.0+ / -0.5 percent, controlling the mixed ore to account for 30 to 50 percent of the total weight of a rich ore powder, a concentrate powder, auxiliary materials and the mixed ore, and adjusting the ratio of the 2 to 4 kinds of iron ore powder to realize segregation of the SiO2 between crude particles and fine particles; and S3, mixing with the rich ore powder, the concentrate powder, the auxiliary materials, a flux and fuel uniformly and then sintering. The segregation and ore matching sintering method of the iron ore has the advantages of improving the physical strength of the sintered ore, improving the graded composition of the sintered ore, reducing energy consumption and increasing the production rate.

Description

technical field [0001] The invention relates to the technical field of iron ore smelting, in particular to an iron ore segregation, blending and sintering method. Background technique [0002] Sintering is a process method of iron ore powder agglomeration. The main purpose of sintering is to form a liquid phase through the reaction of calcium oxide in the flux with iron oxides and silicon oxides in the iron ore. During the cooling process, the liquid phase will bond with the surrounding large particles of unmelted ore, resulting in a A block with a certain strength and excellent metallurgical properties is sent to the blast furnace for smelting. [0003] Due to the difference in silicon content, iron ore powder has different reaction ability with calcium oxide in flux, and the ability and speed of forming liquid phase are also different. When iron ore powder has low SiO 2 content, under the condition of a certain amount of CaO, it can promote the formation and flow of liq...

AI Technical Summary

Problems solved by technology

Generally high SiO 2 The content of mineral powder particle size is small, and low SiO 2 The particle size of the slag powder is relatively coarse; when using these two types of sintering powder at the same time, due to the natural segregation in the cloth process, it will cause SiO 2 The mineral powder with high content is finer, and most of them are attached to SiO2 as adhesive powder. 2 On top of large particles with low content, this will lead to low consolidation strength of the produced sinter, and excessive powder ore will be produced during crushing, resulting in a small overall particle size of the sinter, which will affect the blast furnace smelting

Images