Method for preparing sinter ore by using high-silicon fine ore

Abstract

The invention discloses a method for preparing sinter ore by using high-silicon fine ore. The method comprises the following steps: preparing raw materials in percentage by mass: 9-12% of iron ore concentrate A, 9-12% of iron ore concentrate B, 23-30% of low-silicon fine ore, 2-9% of high-silicon fine ore, 4.5-9.0% of limestone, 0-2.0% of serpentine, 0-4% of dolomite, 2.5-3.5% of quick lime, 4.0-4.5% of coke powder and 28-35% of return mine; adding water to the raw materials, mixing and granulating to obtain a mixed material, wherein the water accounts for 7-8% of the mixed material; sintering the mixed material for 25-40 minutes at 1000-1500 DEG C to prepare the sinter ore, wherein the sintering ignition time is 1-3 minutes, the ignition negative pressure is 3000-6000Pa; an air extracting operation is carried out in the sintering process, the air extracting negative pressure is 9000-12000Pa. According to the method for preparing sinter ore, low-price high-silicon fine ore is matched with other iron materials, so that the use of the high-price silicon-containing solvent serpentine can be reduced or even not needed; the enough strength of the sinter ore can be ensured; meanwhile, the raw material cost can be reduced.

Description

technical field [0001] The invention relates to the field of sintered ore production, in particular to a method for preparing sintered ore by using high-silica powder ore. Background technique [0002] In recent years, with the increasing shortage of iron ore resources, our country has become more and more dependent on imported ore. All major iron and steel enterprises are committed to reducing the cost of pig iron to the greatest extent, and ensuring the quality of blast furnace raw materials is stable. Under the premise of this, some iron and steel enterprises began to use iron ore powder with low price and slightly lower quality. In the field of sintering, since a certain amount of SiO must be guaranteed in the sinter 2 content, so as to ensure the liquid phase of the sinter, and then make the strength of the sinter meet the requirements of the blast furnace, so some enterprises increase the SiO content of the sinter by adding serpentine 2 The content and the purpose of...

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Problems solved by technology

[0003] Chinese Patent Application No. 201210061527.6 "A Process for Producing Sintered Ore for Blast Furnace Ironmaking Using High-alumina Limonite" discloses a process for producing sintered ore for blast furnace ironmaking using high-aluminum limonite. Although silicon-containing limonite can be used to produce sintered ore, the addition of silicon-containing flux can be reduced, but due to the limonite Al 2 o 3 Higher content has adverse effects on the fluidity of blast furnace slag

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