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A kind of high magnesium pellet and its production method

A technology for high-magnesium pellets and pellets, applied in the field of iron and steel metallurgy, can solve the problems of unfavorable blast furnace intensified smelting, low drum index of pellets, low magnesium oxide content of pellets, etc., so as to improve fluidity and ensure enhanced smelting. , the effect of increasing the content of magnesium oxide

Active Publication Date: 2020-11-24
TIANJIN TIANGANG UNITED SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The pellets produced by the prior art have a low magnesium oxide content of about 0.75%, and the drum index is about 93%. After adding magnesium powder, the pellet drum index is reduced to about 88%. The drum index of the ore is low, which is not conducive to the intensified smelting of the blast furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] S1, batching process: mix the raw materials with the following mass fractions: fine powder 35.7%, Carrara powder 60%, magnesium powder 1.8%, bentonite 2.5%;

[0028] S2. Drying and grinding process: Dry the raw materials in S1, the drying temperature is controlled at 850±50°C, and the particle size of the raw materials after the grinding machine is required to be -200 mesh ≥ 80%, to ensure the grinding of the raw materials Effect;

[0029] S3. Pelletizing process: the raw materials in S2 are pelletized by a disc pelletizer, the water content of the green pellets is controlled at 8.5-9.5%, the particle size is 15-20mm ≥ 90%, and the drop strength of the green pellets per meter is not less than 5 times;

[0030] S4. Control of thermal parameters: distribute the green balls in S3 evenly on the drying bed of the shaft furnace. The temperature is controlled at 90-120°C.

Embodiment 2

[0032] S1, batching process: mix the following raw materials in mass fraction: fine powder 15.8%, carrara powder 80%, magnesium powder 1.8%, bentonite 2.4%;

[0033] S2. Drying and grinding process: Dry the raw materials in S1, the drying temperature is controlled at 850±50°C, and the particle size of the raw materials after the grinding machine is required to be -200 mesh ≥ 80%, to ensure the grinding of the raw materials Effect;

[0034] S3. Pelletizing process: the raw materials in S2 are pelletized by a disc pelletizer, the water content of the green pellets is controlled at 8.5-9.5%, the particle size is 15-20mm ≥ 90%, and the drop strength of the green pellets per meter is not less than 5 times;

[0035] S4. Control of thermal parameters: distribute the green balls in S3 evenly on the drying bed of the shaft furnace. The temperature is controlled at 90-120°C.

Embodiment 3

[0037] S1, batching process: mix the following raw materials in mass fraction: fine powder 25.7%, carrara powder 70%, magnesium powder 1.8%, bentonite 2.5%;

[0038] S2. Drying and grinding process: Dry the raw materials in S1, the drying temperature is controlled at 850±50°C, and the particle size of the raw materials after the grinding machine is required to be -200 mesh ≥ 80%, to ensure the grinding of the raw materials Effect;

[0039] S3. Pelletizing process: the raw materials in S2 are pelletized by a disc pelletizer, the water content of the green pellets is controlled at 8.5-9.5%, the particle size is 15-20mm ≥ 90%, and the drop strength of the green pellets per meter is not less than 5 times;

[0040] S4. Control of thermal parameters: distribute the green balls in S3 evenly on the drying bed of the shaft furnace. The temperature is controlled at 90-120°C.

[0041] After inspection, the above 3 embodiments of the present invention and the various data of pellets in ...

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Abstract

The invention belongs to the technical field of iron and steel metallurgy, and particularly relates to a high-magnesium pellet ore and a production method thereof. Raw materials of the high-magnesiumpellet ore comprise 15-40wt% of fine powder, 60-80wt% of carrara powder, 1.5-2.0wt% of magnesium powder, and the balance being bentonite. The production method of the high-magnesium pellet ore comprises the following steps of: fully mixing the raw materials, then drying, controlling the drying temperature to be 850 plus or minus 50 DEG C, performing wet-grinding on the raw materials by using a wet-grinding machine till the 200-mesh particle size of the raw materials is greater than or equal to 80%; pelletizing the raw materials, controlling the moisture of fresh pellets to be 8.5-9.5%, and the15-20mm particle size to be greater than or equal to 90%, wherein the falling strength per meter of the fresh pellets is not lower than 5 times; uniformly arranging the fresh pellets on a drying bed,controlling the temperature of a drying bed of a shaft furnace to be 500 plus or minus 50 DEG C, controlling the temperature of a combustion chamber to be 1060 plus or minus 20 DEG C, and controllingthe temperature of a fume cover to be 90-120 DEG C. The drum index and magnesium oxide content of the pellet ore are obviously improved, and thus, the intensified smelting of a blast furnace is facilitated.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a high-magnesium pellet and a production method thereof. Background technique [0002] Pellet ore is one of the main raw materials for blast furnace ironmaking, and its mass proportion is 10%-35%. With the increase of the proportion of external ore, the alumina content in blast furnace slag continues to increase. In order to ensure the fluidity of blast furnace slag , it is necessary to increase the content of magnesia in the slag to ensure that the ratio of magnesium to aluminum is in an appropriate range to reduce the melting temperature of blast furnace slag. The purpose of increasing the magnesium oxide content of the blast furnace slag is to increase the magnesium oxide content of the pellets by adding magnesium powder to the pellets. [0003] The pellets produced by the prior art have a low magnesium oxide content of about 0.75%, and the drum ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C21B5/00
CPCC21B5/008C22B1/2406
Inventor 张文政王营龙任茂勇董冠求崔猛王存月高梦凡刘福利
Owner TIANJIN TIANGANG UNITED SPECIAL STEEL CO LTD
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