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

A pelletizing and basicity technology, applied in the field of pelletizing and its preparation, can solve the problems of poor metallurgical properties of pellets, hindering blast furnace smelting level, low basicity of pellets, etc., and achieves suitable reducibility, good The effect of popularizing application value and optimizing charge structure

Active Publication Date: 2014-03-05
WUKUN STEEL
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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

[0023] 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:

[0024] 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;

[0025] 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;

[0026] C. Pelletizing: adjust the water content of the mixed mineral material to 8~9%, and pelletize in the disc pelletizer to obtain raw pellets;

[0027] 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 .

[0028] In the steps A and B, the content of calcium oxide (CaO) in the limestone powder is...

Embodiment 1

[0040] 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%.

[0041] 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.

[0042] 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.

[0043] 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

[0046] 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%.

[0047] 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.

[0048] 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.

[0049]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 the...

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Abstract

The invention discloses pellet ore with good metallurgical property and proper alkalinity and a preparation method thereof, and belongs to the technical field of modification of metallurgical materials. The reduction degree of the pellet ore is 64.00 to 67.00 percent. The pellet ore is prepared by adding limestone powder or dolomite powder with the granularity being less than or equal to 0.074 mm into powdered iron according to the using amount of 2.8 to 5.3 percent. The preparation method comprises the processes of crushing, mixing, pelletizing and roasting, and particularly comprises the following steps: crushing the limestone or the dolomite into powder with the granularity being 10 to 15 mm and then crushing into powder with the granularity being less than or equal to 0.074 mm; adding the limestone powder or the dolomite powder into the powdered iron according to the using amount of 2.8 to 5.3 percent, and mixing uniformly; adjusting the water content of the mixed ore material to be 8 to 9 percent and pelletizing in a disc pelletizing machine; and drying and preheating green balls at the temperature of 200 to 960 DEG C for 12 to 17 minutes, roasting at the temperature of 1,250 to 1,280 DEG C for 25 to 30 minutes, and cooling to room temperature to obtain the finished product pellet ore. The pellet ore prepared by the method has proper alkalinity and metallurgical property, is favorable for optimizing the burden structure of a blast furnace, reducing the coke ratio of the blast furnace and increasing the yield of the blast furnace, and has a 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 Applications(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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