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Pellet ore with good metallurgical property and proper alkalinity, and preparation method thereof

A technology of pelletizing and alkalinity, which is applied in the field of pelletizing and its preparation, can solve the problems of poor metallurgical properties of pelletizing, impeding the level of blast furnace smelting, and low alkalinity of pelletizing, and achieve suitable reducibility and good Promote the application value and optimize the effect of charge structure

Active Publication Date: 2015-05-20
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The pellets produced without fluxing agent generally have low alkalinity and poor thermal performance, which limits the further increase of pellets in the proportion of blast furnace materials, and the metallurgical properties of pellets with low alkalinity are slightly poor, which also hinders the production of pellets. The continuous improvement of blast furnace smelting level

Method used

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  • Pellet ore with good metallurgical property and proper alkalinity, and preparation method thereof

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preparation example Construction

[0021] A method for preparing pellets with good smelting properties and suitable alkalinity, which is characterized in that it includes the steps of pulverizing, mixing, pelletizing and roasting, and specifically includes:

[0022] A. Crushing: crush limestone or dolomite to a particle size of 10~15mm, and then crush it into a powder with a particle size of ≤0.074mm;

[0023] B. Mixing: add limestone powder or dolomite powder to the iron concentrate powder in an amount of 2.8~5.3%, and mix evenly to obtain a mixed mineral material;

[0024] C. Pelletizing: adjust the water content of the mixed mineral material to 8~9%, and pelletize in the disc pelletizer to obtain raw pellets;

[0025] D: Roasting: In the roaster, first dry and preheat the raw pellets at 200~960°C for 12~17min, then roast at 1250~1280°C for 25~30min, and then cool to room temperature to obtain the finished pellets .

[0026] In the steps A and B, the content of calcium oxide (CaO) in the limestone powder is...

Embodiment 1

[0038] A. Pulverization: crush limestone with a calcium oxide content of 53.7% with a PE150×250 jaw crusher to a particle size of 10-15mm, and then use a YGM9517 Raymond mill to crush it into a powder with a particle size of ≤0.074mm. The content of fine particles with a particle size of <0.074mm in the powder reaches 90%.

[0039] B. Mixing: Add limestone powder to iron concentrate powder in an amount of 2.8%. The iron concentrate powder contains 92% fine particles with a particle size of <0.074mm. Mix the two evenly to obtain a mixed mineral material.

[0040] C. Pelletizing: Adjust the moisture content of the mixed mineral material to 8%, and perform pelletizing in a Ф6000×600 disc pelletizing machine. The speed of the disc pelletizing machine is set to 7r / min, and the inclination angle is 47°. , get raw balls.

[0041] D: Roasting: In a Ф5000×33000 type grate machine——rotary kiln, first dry and preheat the raw balls at 350~950°C for 14 minutes, then roast at 1260°C for 28...

Embodiment 2

[0044] A. Pulverization: crush limestone with a calcium oxide content of 53.7% with a PE150×250 jaw crusher to a particle size of 10-15mm, and then use a YGM9517 Raymond mill to crush it into a powder with a particle size of ≤0.074mm. The content of fine particles with a particle size of <0.074mm in the powder reaches 92%.

[0045] B. Mixing: Add limestone powder to iron concentrate powder in an amount of 3.5%. The iron concentrate powder contains 93% fine particles with a particle size of <0.074mm. Mix the two evenly to obtain a mixed mineral material.

[0046] C. Pelletizing: Adjust the moisture content of the mixed mineral material to 9%, and perform pelletizing in a Ф6000×600 disc pelletizer. The speed of the disc pelletizer is set to 8r / min, and the inclination angle is 46°. , get raw balls.

[0047] D: Roasting: In a Ф5000×33000 type grate machine——rotary kiln, first dry and preheat the green balls at 350~950°C for 13 minutes, then roast at 1270°C for 26 minutes, and th...

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Abstract

The invention discloses a pellet with good smelting properties and suitable alkalinity and a preparation method thereof, belonging to the technical field of metallurgical material modification. The reduction index of the pellets is 64.00-67.00%, which is made by adding limestone powder or dolomite powder with a particle size of ≤0.074mm to the iron concentrate powder in an amount of 2.8-5.3%. The preparation method includes crushing, mixing, pelletizing and roasting steps, crushing the limestone or dolomite to a particle size of 10-15mm, and then crushing it into a powder with a particle size of ≤0.074mm; Add the dosage to the fine iron powder and mix well; adjust the water content of the mixed mineral material to 8~9%, and make pellets in a disc pelletizer; first dry and preheat the raw pellets at 200~960°C for 12~17min, Then roast at 1250-1280°C for 25-30 minutes, and cool to room temperature to obtain finished pellets. The pellets prepared by the method of the invention have suitable alkalinity and good metallurgical properties, are beneficial to optimize the structure of the blast furnace charge, reduce the coke ratio of the blast furnace, increase the output of the blast furnace, and have good popularization and application value.

Description

technical field [0001] The invention belongs to the technical field of modification of metallurgical materials, and in particular relates to pellets with good smelting properties and suitable alkalinity and a preparation method thereof. Background technique [0002] The pellets produced without fluxing agent generally have low alkalinity and poor thermal performance, which limits the further increase of pellets in the proportion of blast furnace materials, and the metallurgical properties of pellets with low alkalinity are slightly poor, which also hinders the production of pellets. The continuous improvement of blast furnace smelting level. Therefore, in the production of pellets, a certain amount of alkaline substances are often added to increase the alkalinity of the pellets to make up for the lack of mineralization and metallurgical properties of the pellets, especially the lack of reducing and reducing expansion properties. In the process of adding flux to improve the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24
Inventor 王福才杨杰康刘宁斌李云峰王映荣刘自敏
Owner WUKUN STEEL
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