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Composite agglomeration technology of iron powdered ore

A technology of composite agglomeration and iron ore powder, which is applied in the field of iron and steel metallurgy, can solve the problems that the sintering method is not suitable for large-scale processing of fine-grained iron concentrates, affects the production process of blast furnaces, and the shortage of acid pellets, etc., and achieves the improvement of vertical Effects of sintering speed and utilization coefficient, reduction of energy consumption of sintered solids, and reduction of energy consumption of sintering production

Active Publication Date: 2009-09-09
CENT SOUTH UNIV
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Problems solved by technology

Practice shows that: the traditional sintering method must produce high-basic sinter to ensure the strength of sinter to meet the requirements of blast furnace smelting, and the sintering method is not suitable for large-scale processing of fine-grained iron concentrate; Particle size and moisture requirements are strict, and will face the problem of resource shortage. At the same time, it is necessary to establish an independent pelletizing plant. The investment in high-temperature equipment is large, and the new pelletizing plant is also limited by resources, plant sites and other conditions, which fundamentally solves the blast furnace. The problem of shortage of acid pellets has certain difficulties
[0003] In addition, due to the different motion states of sinter and pellets in the blast furnace, the two will produce large segregation in the blast furnace, which will affect the blast furnace production process

Method used

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  • Composite agglomeration technology of iron powdered ore

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Embodiment Construction

[0021] 1. The fine-grained iron ore concentrate in the sintering mixture accounts for 35.5%, and 1.0% of quicklime is added to it without adding fuel. It is pelletized separately in the disc pelletizer, and the alkalinity is kept at 0.6; the fine ore part in the mixture accounts for 64.5%, which is mixed with 5.0% coke powder and 4.38% quicklime, with an alkalinity of 3.2, for primary and secondary mixing. The total alkalinity of the control mixture is 2.25. Mix the prepared green balls and the secondary mixture evenly, spread them in a sintering cup, ignite and sinter. The sintering negative pressure is 7kPa, and the material layer height is 700mm. The finished product rate of sintered ore is 81.11%, the drum strength is 63.52%, and the utilization factor is 2.212t.m -2 .h -1 , The vertical sintering speed is 22.57mm / min.

[0022] 2. The fine-grained iron ore concentrate in the sintering mixture accounts for 30%, and 1.0% of coke powder is added to it, without adding quic...

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Abstract

Iron ore powder composite agglomeration process. In the present invention, the fine-grained iron concentrate is separately separated and prepared into pellets, and then mixed with coarse-grained iron-containing ore powder and other raw materials, spread on a traditional sintering machine for roasting, and is made of acidic pellets embedded in high-alkalinity sintering Composite ironmaking charge composed of ore. With the present invention, the existing iron-containing raw materials can be fully and rationally utilized; the shortcomings of poor air permeability and difficult sintering of the material layer in the sintering process of the fine-grained concentrate are overcome; Disadvantages of segregation; significantly reduce sintering energy consumption and save investment in plant construction.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a method for preparing artificial composite lump ore for blast furnace ironmaking by using iron-containing ore powder. Background technique [0002] In recent years, with the rapid development of my country's iron and steel industry, the requirements for the quantity and quality of ironmaking raw materials have become higher and higher. The proportion of artificial agglomerates (sinter and acid pellets) used in blast furnace ironmaking has exceeded 90%. At present, the sinter and pellets used in ironmaking production are prepared by different processes on different agglomeration equipment, and sent to the blast furnace silo respectively, and then enter the blast furnace for smelting after being proportioned. Practice shows that: the traditional sintering method must produce high-basic sinter to ensure the strength of sinter to meet the requirements of blast furnace smelting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16
Inventor 姜涛李光辉胡友明张克诚邬捷鹏黄柱成范晓慧朱德庆张元波许斌郭宇峰杨永斌董海刚刘牡丹潘健朱忠平王海涛
Owner CENT SOUTH UNIV
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