Method for preparing sintering ore from high-crystallite ferrihydrite powder

A sinter and high crystallization technology, applied in the field of sinter, can solve the problems of loose structure of sinter cake, multi-fuel consumption, limitation of limonite ratio, etc.

Active Publication Date: 2020-05-19
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with magnetic concentrate, limonite sintering requires more fuel consumption, which limits the proportion of limonite in sintered ore; at the same time, it also causes loose structure of sintered cake, increased powder amount, low yield and low strength

Method used

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  • Method for preparing sintering ore from high-crystallite ferrihydrite powder
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  • Method for preparing sintering ore from high-crystallite ferrihydrite powder

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Embodiment

[0028] 1) According to the raw materials and fuels shown in the following table 1 and the proportioning shown in the following tables 2 and 3, batching is carried out, wherein the particle sizes of iron ore powder B, iron ore powder C and iron ore powder D are all passed through a 200-mesh sieve The rate is 90%, and the raw materials are obtained;

[0029] 2) The raw materials are mixed with water in the primary mixer, and the moisture is controlled to 7.0%; then granulated in the secondary mixer, the granulation time is 5min, and the pellets are obtained. The average particle size of the pellets is 16mm;

[0030] 3) The granulated pellets are evenly distributed to the sintering device through the distributor. The thickness of the material layer is 700mm. The sintering igniter is ignited. The ignition fuel is natural gas. The ignition time is 2.0min. At the same time, the bottom of the sintering device starts to draw air. A certain negative pressure is formed under the grate,...

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Abstract

The invention discloses a method for preparing a sintering ore from high-crystallite ferrihydrite powder. The method includes the following steps of firstly, preparing a raw material from, by mass, 75-90% of iron powder, 3.5-8.5% of limestone, 0-4% of light-burned dolomite, 1.5-2.5% of serpentine, 3.0-4.5% of quick lime and 4.5-6.0% of coke powder; secondly, adding water to the raw material to bemixed to obtain a mixture, and performing granulating to obtain granules; and thirdly, performing distributing, igniting and sintering on the granules to obtain the sintering ore. The obtained sintering ore has the alkalinity of 1.95-2.05, the MgO mass percentage of 1.90-2.10% and the tumbler strength of larger than or equal to 65.8%, can be effectively used for production in a blast furnace, andensures the long-term smoothness of the production in the blast furnace.

Description

technical field [0001] The invention belongs to the technical field of metallurgical sintered ore production, and in particular relates to a method for preparing sintered ore by using high-crystallization ferrihydrite powder, and the sintered ore obtained by the method. Background technique [0002] Sinter is the most important iron-containing charge for blast furnaces. At present, the iron charge structure of blast furnaces is generally high-basic sinter and acid pellets. In recent years, affected by steel price fluctuations, most iron and steel enterprises have used a large amount of economical furnace materials in order to reduce ironmaking costs, making it difficult to control the sintering process and sinter quality indicators. For some enterprises, since their own iron ore resources are magnetically separated iron concentrates, the particle size composition is relatively fine, which seriously deteriorates the air permeability of the sintered material layer during the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 刘周利白晓光李玉柱李顺喜赵长奕雷霆刘秉新
Owner BAOTOU IRON & STEEL GRP
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