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Production method of large-repose-angle fluxed pellets

A production method and flux-based technology, which are applied in the field of large-angle flux-based pellet production, can solve the problems of easy rolling of pellets and unstable blast furnace airflow, so as to improve the stacking angle of pellets, widen the scope of use, and reduce rolling. performance effect

Active Publication Date: 2021-11-16
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a method for producing large-heap angle flux pellets, which can greatly increase the utilization rate of domestic high-silicon iron ore powder and reduce the need for foreign high-priced low-silicon high-iron concentrate powder. Reliance, to solve the problem of unstable blast furnace airflow caused by the easy rolling of pellets

Method used

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  • Production method of large-repose-angle fluxed pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The specific production process of the large-heap angle flux pellet production method:

[0028] (1) Proportioning according to the following composition requirements: SiO 2 5wt%, Al 2 o 3 1.5wt%, Na 2 O is 0.511wt%, binary alkalinity is controlled at 1.0, and the proportion of red mud is 5wt%, and the composition of red mud used is shown in Table 1. The ratio of high-silicon iron ore powder and quicklime is calculated according to the above requirements.

[0029] Table 1 Red mud composition (wt,%)

[0030] Element Fe 2 o 3

SiO 2

Al 2 o 3

CaO Na 2 o

content 43.12 16.32 20.40 7.98 10.22

[0031] (2) The raw materials are mixed and finely ground, the proportion of mineral powder smaller than 0.074mm is >50%, and the ratio of red mud smaller than 0.074mm is >85%. The two are mixed and then wetted and pelletized.

[0032] (3) Use a sieving machine to sieve out green balls with a particle size range of 6 mm to 10 mm f...

Embodiment 2

[0035] The specific production process of the large-heap angle flux pellet production method:

[0036] (1) Proportioning according to the following composition requirements: SiO 2 6wt%, Al 2 o 3 2wt%, Na 2 O is 0.52wt%, the binary alkalinity is controlled at 1.1, and the proportion of red mud is 4.5wt%. The red mud composition used is shown in Table 2. The ratio of raw materials is calculated according to the above requirements.

[0037] Table 2 red mud composition (wt,%)

[0038] Element Fe 2 o 3

SiO 2

Al 2 o 3

CaO Na 2 o

content 45.21 11.52 14.32 3.96 11.57

[0039] (2) After the raw materials are mixed, they are finely ground, the proportion of mineral powder smaller than 0.074mm is > 60%, and the proportion of red mud smaller than 0.074mm is > 90%. The two are mixed and then wetted and pelletized.

[0040] (3) Use a sieving machine to sieve out green balls with a particle size range of 6mm to 10mm for roasting, and...

Embodiment 3

[0043] The specific production process of the large-heap angle flux pellet production method:

[0044] (1) Proportioning according to the following composition requirements: SiO 2 7wt%, Al 2 o 3 2.5wt%, Na 2 O is 0.501wt%, binary alkalinity is controlled at 1.2, and the proportion of red mud is 4wt%, and the composition of red mud used is shown in Table 3. The proportion of raw materials is calculated according to the above requirements.

[0045] Table 3 red mud composition (wt,%)

[0046] Element Fe 2 o 3

SiO 2

al 2 o 3

CaO Na 2 o

content 44.3 16.26 12.36 4.36 12.53

[0047] (2) The raw materials are mixed and finely ground, the proportion of mineral powder smaller than 0.074mm is >50%, and the proportion of red mud smaller than 0.074mm is >80%. The two are mixed and then wetted and pelletized.

[0048] (3) Use a sieving machine to sieve out green balls with a particle size range of 6mm to 10mm for roasting, and use a ...

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Abstract

The invention relates to a production method of large-repose-angle fluxed pellets. The large-repose-angle fluxed pellets comprise the following raw materials of high-silicon iron ore powder, 3wt%-5wt% of high-aluminum red mud and quicklime. The content of SiO2 in the high-silicon iron ore powder is 5wt%-8wt%; the content of Al2O3 in the high-aluminum red mud is greater than 20wt%, and the content of Na2O is greater than 10wt%. The method has the advantages that a natural repose angle of the large-repose-angle fluxed pellets is larger than 28 degrees, the rolling property is small, rolling of the pellets in a furnace can be reduced, and it is guaranteed that airflow is stable in the blast furnace smelting process.

Description

technical field [0001] The invention belongs to the technical field of blast furnace operation, and in particular relates to a method for producing large-heap angle flux-based pellets. Background technique [0002] Increasing the proportion of blast furnace charge pellets can increase the iron grade of the furnace ore, reduce the ore consumption per ton of iron and the fuel ratio, increase production, reduce pollutant emissions, promote energy saving and emission reduction in the ironmaking system, and reduce the agglomeration process. The cost of flue gas treatment. It is also an important measure to realize the reduction of blast furnace production and the minimization of consumption. As environmental protection requirements become more and more stringent, the pollution caused by sinter production to the environment is becoming more and more unbearable. With the improvement of domestic iron and steel plant pellet production capacity, the progress of ironmaking technology ...

Claims

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Application Information

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IPC IPC(8): C22B1/24C22B1/243
CPCC22B1/2406C22B1/243
Inventor 姜喆朱建伟郭天永谢明辉姚硕李建军张磊车玉满曾宇刘炳楠
Owner ANGANG STEEL CO LTD
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