Super-thick material layer sintering method for dual-alkalinity complex sintered ore

A sintering method and sintering ore technology, which are applied in the field of ironmaking production, can solve the problems of reducing sintering cost and blast furnace ironmaking cost, increasing material layer resistance, short circuit of air flow, etc. The effect of usage

Active Publication Date: 2017-01-18
ANGANG STEEL CO LTD
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Problems solved by technology

However, the traditional sintering process only carries out one-time cloth distribution and one-time ignition. High-alkalinity sinter and acidic sinter can only be produced on different sintering machines, and two kinds of sinters with different basicities cannot be produced by one-time sintering, which is not conducive to double-alkalinity sinter. Promotion and application of new production technology
[0006] In order to improve the economic and technical indicators of sintering, technicians have done a lot of exploration of sintering methods with ultra-thick material layers (the height of the material layer exceeds 800mm), trying to further tap the potential of thick material layer sintering, using increased ignition intensity, high negative pressure and large air flow direct current In this way, it is attempted to increase the thickness of the material layer, but increasing the ignition intensity often causes the surface of the thick material layer to melt, the gaps between the particles of the material layer are blocked, and the resistance of the entire material layer increases, so the negative pressure of the fan must be increased. The air volume causes local short-circuit of the air flow, and the material layer cannot achieve uniform sintering, resulting in a substantial increase in energy consumption, that is, no breakthrough has been made in the sintering of ultra-thick material layers
[0007] The traditional sintering process is no longer suitable for the new production situation, which is not conducive to reducing the cost of sintering and blast furnace ironmaking. It is necessary to study a new sintering production process

Method used

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  • Super-thick material layer sintering method for dual-alkalinity complex sintered ore

Examples

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Effect test

Embodiment 1

[0023] Mix and granulate iron-containing raw materials, fuel, limestone and quicklime through a mixer to obtain sintered mixture A, wherein the mass fraction of iron-containing raw materials is 78%, the mass fraction of fuel is 4%, the mass fraction of quicklime is 5%, and the mass fraction of limestone is The mass percentage is 13%; the basicity of the sintering mixture A is 2.2, the mass percentage of its particle size composition is greater than 3mm and less than or equal to 5mm is 44%, and the mass percentage of greater than 5mm and less than or equal to 8mm is 32%.

[0024] Mix and granulate iron-containing raw materials, fuel, and quicklime through a mixer to obtain sintering mixture B, wherein the mass fraction of iron-containing raw materials is 94%, the mass fraction of fuel is 5%, and the mass percent of quicklime is 1%; the sintering mixture The basicity of B is 0.4, and its particle size composition is 50% by mass of greater than 3mm and less than or equal to 5mm, a...

Embodiment 2

[0029] The iron-containing raw material, fuel, limestone and quicklime were mixed and granulated by a mixer to obtain sintered mixture A, wherein the mass fraction of iron-containing raw material was 82%, the mass fraction of fuel was 3.2%, the mass fraction of quicklime was 5.5%, and the mass fraction of limestone The mass percentage is 9.3%; the basicity of the sintering mixture A is 1.95, the mass percentage of its particle size composition is greater than 3mm and less than or equal to 5mm is 40%, and the mass percentage of greater than 5mm and less than or equal to 8mm is 35%.

[0030] The iron-containing raw material, fuel, and quicklime were mixed and granulated by a mixer to obtain a sintered mixture B, wherein the mass fraction of the iron-containing raw material was 94.5%, and the mass fraction of the fuel was 5.5%; the basicity of the sintered mixture B was 0.2, and its The particle size composition is 46% of the mass percentage greater than 3mm and less than or equal...

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Abstract

The invention discloses a super-thick material layer sintering method for dual-alkalinity complex sintered ore. Two times of material distribution and two times of ignition are conducted, and a sintering mixture at the upper layer is different from a sintering mixture at a lower layer; the sintering mixture A is firstly added into a sintering trolley, the distribution thickness of the sintering mixture A is 600-800 mm, and the sintering mixture A with the alkalinity being 1.8-2.4 is subjected to down draft sintering through ignition of a first igniter; when the sintering trolley travels to the position where the distance between the sintering trolley and a first ignition system is one fifth to one half of the total length of a sintering machine, the sintering mixture B is added and distributed with the distribution thickness of 400-600 mm, and the sintering mixture B with the alkalinity being not higher than 0.5 is subjected to down draft sintering through ignition of a second igniter; and sintered ore at the upper layer and sintered ore at the lower layer are subjected to cooling uniform-mixing and screening uniform-mixing to form the complex sintered ore with the alkalinity being 1-1.4. By means of the super-thick material layer sintering method, the dual-alkalinity sintered ore can be produced through one-time sintering, the mixed sintered ore with the proper comprehensive alkalinity is formed after uniform mixing, and the sintering cost is lowered; and the number of pellets used for a blast furnace is reduced, and the ironmaking cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of ironmaking production, relates to sintering production technology, in particular to an ultra-thick material layer sintering method of double-basicity composite sintered ore. Background technique [0002] Due to the high production cost of pellets and the poor metallurgical performance of lump ore, my country's iron and steel enterprises mainly reduce the cost of ironmaking by increasing the amount of sintered ore. To increase the amount of sinter, two problems must be solved: 1) to increase the output of sinter; 2) to maintain the balance of the alkalinity of the ironmaking raw materials entering the blast furnace. [0003] Under the condition that the effective sintering area is fixed, the main method to increase the output of sintered ore is to increase the thickness of the sintered material layer. This reduces the power consumption of the fan, and leads to a decrease in sintering productivity, especia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/22
CPCC22B1/22
Inventor 张辉周明顺唐复平姚林王义栋任子平韩淑峰宫作岩翟立委刘杰徐礼兵
Owner ANGANG STEEL CO LTD
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