Limonite sintering treatment method

Abstract

The invention discloses a limonite sintering treatment method which comprises the following steps: baking limonite, adding a sintering mixture, and sintering, wherein combustion blast furnace gas is used for baking the limonite, the baking temperature is 410-460 DEG C, and the baking time is 6-10 minutes. The limonite power is mainly composed of the following components in percentage by weight: 37.7-43.66% of TFe, 18.3-23.6% of SiO2, 0.1-0.5% of CaO, 0.3-0.6% of MgO, 4.3-5.6% of Al2O3 and 10.7-12.8% of Ig. Compared with the prior art, the method disclosed by the invention can eliminate the blowout phenomenon of coarse-grain limonite in the sintering process, enhances the strength and yield of the sintered ores, reduces the limonite crystalline water content and fuel consumption, is beneficial to sintering, can improve the metallurgical properties of the sintered ores, enhances the technical economical indexes of blast-furnace smelting, and greatly enhances the resistance to tumbling, yield and metallurgical properties of the sintered ores.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a limonite sintering treatment method. Background technique [0002] The iron-containing raw materials used in the sintering of Panzhihua Iron and Steel Vanadium and Xichang Iron and Steel Vanadium Company are mainly high-titanium vanadium-titanium magnetite concentrate (accounting for more than 60% of iron-containing materials). This mine has TiO 2 、Al 2 o 3 , MgO content is high, SiO 2 Low content, poor hydrophilicity and granulation performance, and easy to form brittle perovskite, silicate and other binder phases in the sintering process, resulting in poor sinter strength, low yield, and return rate High and low temperature reduction pulverization (RDI -3.15 ) is high, and the technical and economic indicators of sintering are extremely poor. In order to strengthen sintering and improve the quality of sintered ore, a part (about 20%-30%) of good particl...

AI Technical Summary

Problems solved by technology

However, at present, the technology of removing limonite crystal water in advance has not been adopted at home and abroad. Instead, it is directly mixed into the sintering material. The technical measures to strengthen the sintering process, such as optimizing ore blending and rationally controlling the ratio of limonite, have achieved certain effects, but they still cannot completely eliminate the disadvantages of limonite crystallization water to sintering, and there are high fuel consumption, limonite Disadvantages such as limited ore ratio

Literature [7] adopts the method of crushing limonite to less than 1 mm, wherein limonite with a particle size of less than 0.074 mm accounts for 10% to 50% of the total weight. Although this can prevent limonite from bursting during the sintering process, the However, it is not conducive to granulation, resulting in a decrease in the particle size of the sintered mixture, poor air permeability of the material layer, and at the same time complicating the process and making it difficult to implement in production