Method for preparing low-SiO2 high-performance sinter ore

Abstract

The invention discloses a method for preparing a low-SiO2 high-performance sinter ore, and belongs to the technical field of sintering of iron ore powder. The method comprises the following steps of: proportioning; mixing; granulating; dispensing; igniting; sintering; crushing; cooling; detecting indexes of the sinter ore; detecting a reduction property; and detecting low-temperature reduction degradation performance. The sinter core comprises the following raw materials in percentage by weight: 75 to 85 percent of iron-containing raw material, 3.5 to 4.5 percent of quick lime, 3.5 to 5.0 percent of dolomite, 2.0 to 3.5 percent of limestone and 5.0 to 6.0 percent of coke powder; and alkalinity CaO / SiO2 of the sinter core is equal to 1.8 to 2.0, TFe content is between 55 and 60 percent, SiO2 content is between 4.2 and 4.5 percent, MgO content is between 1.9 and 2.3 percent, and FeO content is between 8 and 10 percent, wherein the FeO content in the sinter core is realized by a method for increasing the proportion of the coke powder, and the proportion of the coke powder is increased from 3.0-4.0 percent to 5.0-6.0 percent; and finally, a drum index of the sinter core is increased from 82 percent to 83.6 percent, a low-temperature reduction degradation index RDI+3.15 is increased from 39 percent to 51 percent, and a reduction index is increased from 79 percent to 85 percent under conditions of low SiO2 and high FeO.

Description

technical field [0001] The invention belongs to the technical field of iron ore powder sintering, in particular to a low-SiO 2 The high-performance sinter preparation method is to use the existing raw materials and equipment to reasonably control the FeO of the sinter, to ensure the strength of the sinter, and to improve the reducibility and low-temperature pulverization performance of the sinter. Background technique [0002] The performance of sinter has an important influence on the various technical and economic indicators of the blast furnace; the principle of fine material requires that the grade of sinter be increased as much as possible (and then the grade of entering the furnace be increased). Reduce SiO of sinter 2 content, not only can improve the grade of sintered ore, but also can reduce the amount of blast furnace slag, improve the air permeability of blast furnace, and reduce the coke ratio. Therefore, more and more researchers pay full attention and Researc...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a low SiO 2 High-performance sinter preparation method overcomes the previous reduction of sinter SiO 2 Defects of low sinter strength and deterioration of low-temperature reduction pulverization index caused by low content

Images